Present disclosure relates to a field of vehicles. Particularly, but not exclusively the present disclosure relates to an engine of a vehicle provided with a variable valve timing mechanism. Further, embodiments of the disclosure disclose a rocker unit for the variable valve timing mechanism of the engine.
BACKGROUND OF THE DISCLOSURE
Internal combustion engines include valves which are operated to open and closed condition to allow an intake and exhaust of fuel and air into and from cylinders of the engine. The valves are operated by a valve lifter mechanism including rocker arms and roller follower assemblies. The rocker arms transmit motion from a rotating cam shaft to a stem of a poppet valves to open and close the valves. Generally, the valves are spring-biased, such that the rocker arm controls the opening and closing of the valve. The rocker arms are mounted on a rocker shaft adjacent to each other in an axial direction of the rocker shaft and are driven by a camshaft to open/close the valves.
Engines operated with variable valve actuation or timing mechanisms are provided with two rocker arms to operate the same valve. Such rocker arm configuration includes a low-speed rocker arm applicable in a low region of engine rotation speed, and a high-speed rocker arm used in high¬speed region of engine rotation speed. Each of the rocker arm i.e., high-speed rocker arm and low-speed rocker arm include a first end and a second end, wherein the first end of each rocker arm includes a roller which contacts with one cam mounted on the camshaft. The low-speed rocker arm and the high-speed rocker arm are engaged by a coupling pin. The coupling pin when in the engaged position with the higher speed rocker arm causes both the lower speed and the high-speed rocker arms to move as a single unit thereby providing a structural rigidity at higher speed of the engine. When the coupling pin is disengaged from the higher speed rocker arm, the rocker arms are allowed to move independent of each other.
However, during high-speed rotation of the engine, conventionally the low speed and the high-speed rocker arms are subjected to higher forces at various locations such as at a point of contact of each of the rollers, at the coupling pin disposed an opposite to the roller, and at a rotation axis of the rocker arm. Thus, causes a bending moment around the rocker arm rotation axis, which may

result in failure of the rocker arms. Conventionally this problem is addressed by increasing size of the rocker arms with heavier springs to resist the movement of the valves at higher speed rotation of the engines. As a result, increasing the overall weight and inertia which is undesired and eventually leads to inflict damage to the rocker arms. This ultimately increases the manufacturing cost for manufacturing increased size of the rocker arms.
The present disclosure is directed to overcome one or more above limitations stated above or any other limitation associated with the prior arts.
SUMMARY OF THE DISCLOSURE
The one or more shortcomings of the prior art are overcome by the system/assembly as claimed, and additional advantages are provided through the provision of the system/assembly/method as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In one non-limiting embodiment of the present disclosure, a rocker unit of an engine is disclosed.
The rocker unit comprises a rocker arm mounted on a rocker shaft. The rocker arm comprises a first end including a roller which contacts with a first cam mounted on a cam shaft to cause a reciprocating motion of the rocker arm about an axis of the rocker shaft. Further, a second end includes a valve lash adjuster to push at least one of an intake valve and an exhaust valve of the engine based on the reciprocating motion of the rocker arm. An auxiliary rocker member is disposed adjacent to the rocker arm and configured to extend towards the first end of the rocker arm. Further, a free end of the auxiliary rocker member contacts with a second cam mounted on the cam shaft. The rocker unit further includes a locking pin disposed in a first provision defined in the first end of the rocker arm. The locking pin is being configured to be selectively received in a second provision defined in the auxiliary rocker member to couple the rocker arm and auxiliary rocker member. This configuration of the locking pin at the first end of the rocker arm and the auxiliary rocker member reduces overall size and weight of the rocker unit, thereby improving life of the rocker unit.

In an embodiment, the rocker unit comprises a biasing member that is mounted on the cylinder head. The biasing member extends to support the auxiliary rocker member and facilitates a constant contact of the free end of the auxiliary member with the second cam during the reciprocating motion between the cam shaft and the auxiliary rocker member.
In an embodiment, the biasing member is a resilient flat strip having one end secured to the cylinder head and another end biasing the auxiliary rocker member. The flat strip eliminates the need of additional rocker arm, thus reducing the overall weight.
In an embodiment, the auxiliary rocker member is defined with a primary end having a through hole to allow mounting of the auxiliary rocker member to the rocker shaft. Also, the auxiliary rocker member is defined with a secondary end having the second provision to receive the locking pin. This change in location of the locking pin preventing transfer of force and load only to the primary end of the rocker arm.
In an embodiment, the secondary end of the auxiliary rocker member is defined with a predetermined curvature to abut and make the sliding contact with the second cam of the cam shaft. The predetermined curvature aids in minimizing the frictional forces during contact, thus increasing life of the auxiliary rocker member.
In an exemplary embodiment, the auxiliary rocker member comprises a resilient support member disposed between a hub of the auxiliary rocker member and the rocker shaft. The resilient support member facilitates constant contact of the free end of the auxiliary rocker member with the second cam of the cam shaft during the reciprocating motion between the cam shaft and the auxiliary member. The resilient support member is configured to provide support to the coupling pad and also to minimise the vibrations caused during an operation condition.
In an embodiment, the resilient support member is a torsional spring.
In an embodiment, the locking pin is selectively actuated to slide from the first provision and towards the second provision by a solenoid actuation mechanism.
In another embodiment, the auxiliary rocker member comprises a resilient support member having a first end supported by a hub of the rocker arm and a second end. Further, a coupling pad is

supported by the second end of the resilient support member. The resilient support member facilitates contact of the coupling pad with the second cam of the cam shaft during the reciprocating motion between the cam shaft and the auxiliary rocker member. In an embodiment, the rocker unit comprises a securing pin protruding from the first end of the rocker arm to securely support the resilient support member. The securing pin provides support to the leaf spring.
In an embodiment, the resilient support member is a 'leaf spring having secured to the hub of the rocker arm and the resilient support member is defined with a guide channel for receiving the securing pin. This enables in reduced number of components.
In an embodiment, the coupling pad is defined with a groove to receive the locking pin. This formation on groove on the coupling pad eliminated the need of additional component to support the locking pin.
In yet another embodiment, the auxiliary rocker member comprises a flat resilient member having a first end removably secured at a bottom portion of a hub of the rocker arm and a second end. The auxiliary rocker member further includes a coupling pad supported by the second end of the flat resilient member. The flat resilient member facilitates contact of the coupling pad with the second cam of the cam shaft during the reciprocating motion between the cam shaft and the auxiliary rocker member.
In an embodiment, the second end of the flat resilient member is provided with a provision to accommodate the coupling pad, such that a free end is positioned below the flat resilient member and the groove is configured above the flat resilient member, respectively.
In an embodiment, the auxiliary rocker member is structured to make sliding contact with the second cam mounted on the cam shaft.
It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects,

embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristics of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
Figure 1 illustrates a cross-sectional view of an engine, in accordance with the present disclosure;
Figure 2 illustrates a cross-sectional view of a cylinder head of the engine comprising a rocker unit in accordance with the present disclosure;
Figure 3 illustrates a view of the rocker unit of the engine, in accordance with an embodiment of the present disclosure;
Figure 4 illustrates another view of the rocker unit depicting auxiliary the rocker member, in accordance with another embodiment of the present disclosure;
Figure 5 illustrates a view a rocker unit with the auxiliary rocker member, in accordance with yet another embodiment of the present disclosure;
Figure 6 illustrates an exploded view of the rocker unit of Figure 4;
Figures 7a and Figure 7b illustrate views of the rocker unit with the auxiliary the rocker member in accordance with still another embodiment of the present disclosure, respectively; and
Figure 8 illustrates an exploded view of the rocker mechanism with the auxiliary rocker member in accordance with still another embodiment of the present disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other mechanism for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
In the present disclosure, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the disclosure.

The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusions, such that a setup, device, or process that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or process. In other words, one or more elements in a system or apparatus proceeded by "comprises... a" does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
The terms like "at least one" and "one or more" may be used interchangeably or in combination throughout the description.
While the present disclosure is illustrated in the context of a vehicle, however, a rocker unit of an engine aspects and features thereof can be used with other type of vehicles as well. The terms "modular vehicle", "vehicle", "two-wheeled vehicle", and "motorcycle" have been interchangeably used throughout the description. The term "vehicle" comprises vehicles such as motorcycles, scooters, bicycles, mopeds, scooter type vehicle, and the like.
The terms "front/forward", "rear/rearward/back/backward", "up/upper/top", "down/lower/lower ward/downward, bottom", "left/leftward", "right/rightward" used therein represents the directions as seen from a vehicle driver sitting astride.
A typical two wheeled vehicle among other components include a front wheel, steering member, rear wheel, fuel tank, seat member, all supported by a frame. The frame generally includes a head tube, down tube, a pair of seat rails, and cross members. The two wheeled vehicle also includes an internal combustion engine mounted on the frame. The internal combustion engine is disposed in a space downside of a fuel tank and behind front fork. In some embodiment, the internal combustion engine may be positioned below the seat. A transmission is operationally coupled the internal combustion engine to transmit a power output from the internal combustion engine to the rear wheel via a transmission mechanism. The internal combustion engine (200) as illustrated in Figures 1 and 2 includes a crankcase, a cylinder body (206), a cylinder head (201), and a head cover (205). The crankcase houses a crankshaft (207), and the cylinder body (206) is connected to the crankcase. The cylinder body (206) may be integrated with the crankcase or may be a separate

body. The cylinder body (206) houses a piston (208). The piston (208) is coupled to the crankshaft (207) via a connecting rod (209). The cylinder head (201) is disposed on the head cover side of the cylinder body (206). The cylinder head (201) is coupled to the cylinder body (206). The head cover (205) is further disposed on the head cover side of the cylinder head (201). The head cover (205) is coupled to the cylinder head (201), many times removably. The cylinder head (201) includes a combustion chamber (202). A spark plug (not shown) is provided in the cylinder head (201). A tip end portion of the spark plug is disposed so as to face the combustion chamber (202). The base end portion of the spark plug is disposed outside of the engine (200). Further, a valve mechanism is housed in the cylinder head (201) and the head cover (205). The valve mechanism is configured to operate exhaust valves (203) and intake valves (204) associated with each cylinder in the cylinder head (201). Further, an overhead camshaft mechanism is used in the valve mechanism to operate the valves to open and close the intake and exhaust ports (204a, 203a) of each cylinder in the cylinder head (201). A variable valve mechanism may be provided in the engine (200) to switch the timing for opening and closing the intake valves and is used in the valve mechanism.
Embodiments of the present disclosure discloses a rocker unit of an engine. The rocker unit of the present disclosure minimises inertia and the need for enhanced structural rigidity during varying speeds of the engine.
The rocker unit according to various embodiments of the present disclosure is light in weight and capable of catering to higher speeds of the engine. Moreover, the rocker unit is subjected to reduced bending moment and friction developed during higher speed operation of the engine. The rocker unit includes an auxiliary rocker member that suitably provides structural rigidity at higher speed of the engine without increasing size of the rocker unit.
In the following detailed description, embodiments of the disclosure are explained with reference to accompanying figures that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without

departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
Referring to Figure 1 and 2, a cylinder head (201) of an engine (200) comprising a valve mechanism. The cylinder head (201) comprises an intake port (204a) and an exhaust port (203a) that communicate with a combustion chamber (202). The intake valves (204) open and close the intake port (204a). Further, exhaust valves (203) open and close the exhaust port (203a). The valve mechanism includes a rocker unit that presses the intake and exhaust valves (204, 203) to open and close. The rocker unit (100) is driven by a camshaft (50).
Figures 3 to 8 are exemplary embodiments of the present disclosure illustrating views of a rocker unit (100). The rocker unit (100) includes a rocker arm (10) mounted on a rocker shaft (40). The rocker arm (10) includes a first end (11) defining a pair of spaced apart arms (11a and 1 lb) and a roller (12) between the pair of spaced apart arms (11a and 1 lb). The roller (12) contacts or traces with a first cam (51a) mounted on a cam shaft (50). The contact between the roller (12) at first end (11) with the first cam (51a) causes a reciprocating motion of the rocker arm (10) about an axis (A-A) of the rocker shaft (40). Further, in an embodiment, a first provision (15) is defined in the first end (11) of the rocker arm (10) to receive a locking pin (30). In an embodiment, a mounting provision (16) is provided on each arm of the pair of arms (11a and 1 lb). Referring Figures 5 to 8 , the mounting provision (16) provided on the rocker arm (10) is coaxial to a mounting hole (17) provided in the roller (12). In an embodiment, the mounting provision (16) at the first end (11) and the mounting hole (17) of the roller (12) are configured to receive a locking member to support the roller (12). The mounting provision (16) is at least one of hole, aperture, slot, groove, and any suitable provision to receive a locking means to support the roller (12). In an embodiment, the mounting provision (16) and the mounting hole (17) of the roller (12) may receive a locking pin (30). Also, the first provision (15) which is configured to receive the locking pin (30) may be disposed adjacent to the mounting hole (17). Further, a second end (13) opposite to the first end (11), includes a valve lash adjuster (45) to push at least one of an intake valve and an exhaust valve (203, 204) of the engine (200) based on the relative reciprocating motion of the rocker arm (10).
The rocker unit (100) of the present disclosure comprises an auxiliary rocker member (20). The auxiliary rocker member (20) is disposed adjacent to the rocker arm (10) and extends only towards

the first end (11) of the rocker arm (10). Referring to the Figure 3 the auxiliary rocker member (20) is rotatably mounted on the rocker shaft (40) and adjacent to the rocker arm (10). The auxiliary rocker member (20) is defined with a primary end (21) and a secondary end (22). As shown in Figure 4, the primary end (21) of the rocker arm (10) comprises a through hole (23) to receive the rocker shaft (40). The secondary end (22) of the auxiliary rocker member (20) is defined as an extended flange having a predetermined curvature at a free end (20b) to abut and make a sliding contact with a second cam (51b) of the cam shaft (50). Further, a mid-segment formed between the primary end (21) and the secondary end (22) is provided with a second provision (25) to receive the locking pin (30). In an embodiment, the first provision (15) of the rocker arm (10) is coaxial to the second provision (25) of the auxiliary rocker member (20). Further, the locking pin (30) is disposed along an axis (B-B) of the first provision (15). In an embodiment, the axis of the first provision (15) is parallel to the rocker shaft axis (A-A). The locking pin (30) is selectively receivable in the first provision (15) and the second provision (25) defined in the auxiliary rocker member (20) to engage and disengage the rocker arm (10) with the auxiliary rocker member (20). The first provision (15) and the second provision (25) are at least one of hole, aperture, slot, and any suitable provision to receive the locking pin (30).
Referring to Figures 3 and Figure 8, the secondary provision (25) may be defined as a groove that can accommodate a portion of the locking pin (30), when the locking pin (30) engages with the auxiliary rocker member (20). The groove may be defined with a configuration complementary to a configuration of the locking pin (30). Further, the secondary end (22) is provided with the groove. More specifically, the groove is defined at an operative end of the auxiliary rocker member (20). In an embodiment, the groove is configured to receive the locking pin (30).
The rocker unit (100) according to some embodiments of the present disclosure comprises a biasing member (35) [as shown in Figure 3]. The biasing member (35) is mounted in a portion of the cylinder head (201) such that the biasing member (35) extends from the cylinder head (201) towards the rocker unit (100) to bias the auxiliary rocker member (20) towards the second cam (51b) of the camshaft (50). The biasing member (35) is configured to maintain a constant contact of the auxiliary rocker member (20) with the second cam (51b) of the cam shaft (50) during the reciprocating motion. In an embodiment, the biasing member (35) is defined as a resilient flat strip having one end (35a) secured to the cylinder head (201) and another end (35b) biasing the auxiliary

rocker member (20). Another end (35b) of the resilient flat strip supports and exerts a force on the auxiliary rocker member (20) to cause biasing. The biasing member (35) is secured to the cylinder head (201) by at least one fastener. Further, a bottom surface of another end of the biasing member (35) abuts a top surface of the auxiliary rocker member (20) to exert force to maintain constant contact of the auxiliary rocker member (20) with the second cam (51b) mounted on the cam shaft (50). This configuration of the biasing member (35) facilitates in maintaining a position of the auxiliary rocker member (20) while maintaining a spring stiffness required for the rocker unit (100) during high-speeds of the engine (200).
In an operative configuration, the rocker arm (10) functions as a low-speed rocker arm applicable in a low region of engine rotational speeds, and the auxiliary rocker member (20) functions as a high-speed rocker arm used in high-speed region of engine rotational speeds. Referring to Figures 3 to 5, the locking pin (30) is disposed in the first provision (15) defined in the first end (11) of the rocker arm (10) and the locking pin (30) is adapted to be selectively received in a second provision (25) defined in the auxiliary rocker member (20) to couple the rocker arm (10) and auxiliary rocker member (20). In another embodiment, the locking pin (30) may be disposed in the second provision (25) of the auxiliary rocker member (20) and the locking pin (30) is adapted to be selectively received in a first provision (15) defined in the rocker arm (10) to couple the rocker arm (10) and auxiliary rocker member (20).
The locking pin (30) is configured to move by a solenoid actuation mechanism. As an example, the locking pin (30) is disposed in the first provision (15) of the rocker arm (10) to perform the function of low- speed rocker arm at low region of engine rotational speeds. Further, the rocker arm (10) is driven by at least one low speed cam lobe mounted on the camshaft (50), thereby opening, and closing at least one of the intake and exhaust valves. In another embodiment, the locking pin (30) may be actuated to slide from the first provision (15) towards the second provision (25) to engage the rocker arm (10) with the auxiliary rocker member (20). During this engagement, the auxiliary rocker member (20) works as the high-speed rocker arm used in high-speed region of engine rotational speeds. As a result, the rocker arm (10) and, the auxiliary rocker member (20) works in tandem such that the auxiliary rocker member (20) maintaining the contact with the second cam (51b) via the force exerted by the biasing member (35), thus opening and closing the at least one of intake and exhaust valves (203, 204).

In an embodiment and with reference to Figures 5 and 6, the rocker unit (100) comprises the auxiliary rocker member (20) comprises a hub (18) to receive a resilient support member (36) to provide constant contact of the free end (20b) of the auxiliary rocker member (20) with the second cam (51b) of the cam shaft (50) during the reciprocating motion of the auxiliary rocker member (20). In an embodiment, the rocker arm (10) includes a securing pin (19) protruding from the second end (13) of the rocker arm (10) to securely support the resilient support member (36). Further, the resilient support member (36) may be a torsional spring, at first end (36a), having secured to the hub (18) and the second end (36b) is configured to receive the securing pin (19). In another embodiment, second end (36b) of the resilient support member (36) extends from the hub (18) towards the first end (11) of the rocker arm (10) to support the auxiliary rocker member (20). The rocker arm (10) and the auxiliary rocker member (20) selectively engage and disengage with each other via the locking pin (30). In an embodiment, the first provision (15) of the rocker arm (10) is coaxial to the second provision (25) of auxiliary rocker member (20) [as shown in Figure 6] to slidably receive of the locking pin (30).
Referring to Figures 7a and 7b, in another embodiment as the rocker unit (100) comprises the rocker arm (10) having the hub (18) extending along the axis (A-A) of the rocker shaft (40). The hub (18) of the rocker arm (10) is configured to support the auxiliary rocker member (20). In an embodiment, the hub (18) supports the auxiliary rocker member (20) via a flat resilient member (37) coupled to the hub (18). The flat resilient member (37) is securely coupled to the hub (18) by at least one fastener (38). Further, the flat resilient member (37) is defined with first end (37a) coupled to the hub (18) and the second end (37b) extends from the hub (18) only towards the first end (11) of the rocker arm (10) to support the coupling pad (24). The first end (37a) of the flat resilient member (37) is secured at a bottom portion of the hub (18) and the second end (37b) securely supports the coupling pad (24). Further, the flat resilient member (37) is provided with a provision to accommodate the coupling pad (24). In an embodiment, the provision may be a slot receive and couple with the second end (37b) of the flat resilient member (37). In an embodiment, resilient member (37) itself is capable of ensuring constant contact between the coupling pad (24) and the second cam (51b) of the cam shaft (50) during the reciprocating motion between the cam shaft (50) and the auxiliary rocker member (20).

In exemplary embodiment, the coupling pad (24) includes a free end (24b) defined with a curvature for abutting against the second cam (5 lb) of the cam shaft (50) to make the sliding contact. Further, the coupling pad (24) is defined with the second provision (25). In an embodiment, the second provision (25) is a groove to receive the locking pin (30). In an embodiment, the coupling pad (24) comprises sides surface defined with U-shaped slots to receive and couple with the second end of the flat resilient support member (37). The coupling pad (24) is accommodated such that a free end (24b) is positioned below the flat resilient member (37) and a groove (25) is configured above the flat resilient member (37), respectively. Further, the coupling pad (24) is having the groove (25) to receive the locking pin (30). In an embodiment, the flat resilient member (37) along with the coupling pad (24) performs as the auxiliary rocker member (20). In an operative configuration, when the locking pin (30) is actuated to slide through the first provision (15) and the groove (25), the rocker arm (10) engages with the coupling pad (24) via the flat resilient support member (37). In this state, the coupling pad (24) is driven by the second cam (51b) i.e., high speed cam mounted on the cam shaft (50). More specifically, the coupling pad (24) maintains the sliding contact with the second cam (51b) via the flat resilient support member (37) thereof, thereby opening and closing the at least one of intake and exhaust valves (204, 203).
In an embodiment, the groove is configured to receive the locking pin (30), when the locking pin (30) slides from the first provision (15) defined in first end (11) the rocker arm (10). In another embodiment, a thickness of the coupling pad (24) having the curvature is less than a thickness of the second cam (51b). Due to this configuration of the coupling pad (24), a friction between the coupling pad (24) and the second cam (51b) is reduced, thereby increasing life of the rocker unit (100). Further, a width of coupling pad (24) is more than the roller (12) of the rocker arm (10).
In an embodiment and with reference to Figure 8, the rocker unit (100) comprises the rocker arm (10) comprises a hub (18) extending axially along the axis (A-A) of the rocker shaft (40). The hub (18) is configured to support the auxiliary rocker member (20), thereby providing constant contact of the free end (24b) of the coupling pad (24) with the second cam (51b) of the cam shaft (50) during the reciprocating motion between the cam shaft (50) and the auxiliary rocker member (20). In an embodiment, the auxiliary rocker member (20) includes a resilient support member (38) rotatably mounted on rocker arm (10). In an embodiment, the auxiliary rocker member (20) includes a resilient support member (38) rotatably mounted on the hub (18). The biasing member

(38) may be a resilient member. Further, the biasing member (38) may be an S- shaped resilient member. In an exemplary embodiment, the biasing member (38) is an S- shaped leaf spring. The resilient support member (38) is having a first end (38a), a second end (38b) and a hooking portion (39). The first end (38a) is supported by the hub (18). The first end (38a) may be having a circular contour that is rotatably supported by the hub (18). In an embodiment, the first end (38a) may not be having circular contour but rotatably supported by the hub (18). In an embodiment, the first end (38a) may be having an elliptical contour that is rotatably supported by the hub (18).
The second end (38b) and the hooking portion (39) are disposed on the opposite sides of the first end (38a). The first end (38a) biases the second end (38b) and the hooking portion (39) away from each other. The hooking portion (39) is configured to engage with the securing pin (19). In an exemplary embodiment, the hooking portion (39) is defined with a guide channel (39) for receiving the securing pin (19). As can be seen in the Figure 8, the hooking portion (39) defines the first loop of the of the S- shaped leaf spring and the first end (38a) defines the second loop of the S- shaped leaf spring. The second end (38b) extends from the hub (18) only towards the first end (11) of the rocker arm (10) to support the coupling pad (24).
In an embodiment, the rocker arm (10) includes a securing pin (19) protruding from the first end (11) of the rocker arm (10) to support the resilient support member (38). In an embodiment, the securing pin (19) extends along the length of the rocker shaft (40) and towards the auxiliary rocker member (20). The hooking portion (39) is engaged with the securing pin (19).
Thus, since the hooking portion (39) is engaged with the securing pin (19) and the first end (38a) biasing the second end (38b) and the hooking portion (39) away from each other, the second end (38b) provides constant contact of the with the second cam (51b) of the cam shaft (50) during the reciprocating motion between the cam shaft (50).
In an embodiment, second end (38b) of the resilient support member (38) extends from the first end (38a) or from the hub (18) only towards the first end (11) of the rocker arm (10) to support the coupling pad (24). Referring to Figure 8, the resilient support member (38) along with the coupling pad (24) performs as the auxiliary rocker member (20).

The coupling pad (24) is supported by the second end (38b) of the resilient support member (38). In an embodiment, the configuration of the resilient support member (38) and the coupling pad (24) provides structural rigidity without the need of increased size of structures to accommodate forces acting on the rocker unit (100) during high-speed of the engine (200). During, the reciprocating motion of the rocker arm (10) about the axis (A-A) of the rocker shaft (40), the securing pin (19) functions as spring and when the axis of the rocker shaft (40) becomes a pivoting point. The rocker arm (10) and the auxiliary rocker member (20) selectively engage and disengage with each other via the locking pin (30). In an embodiment, the first provision (15) of the rocker arm (10) is coaxial to the second provision (25) of auxiliary rocker member (20) [as shown in Figure 8] to slidably receive of the locking pin (30). Further, the resilient support member (38) is provided with a provision (38c) to accommodate the coupling pad (24). In an embodiment, the provision may be a slot receive and couple with the second end (38b) of the resilient support member (38).
During the operative configuration, the rocker unit (100) as disclosed in the present disclosure is subjected to external forces at firstly a point of contact of the roller (12) of the rocker arm (10) with the first cam (51a) i.e., low speed cam and secondly at the free end (20b) of the auxiliary rocker member (20). Moreover, these forces are transmitted to the each of the rocker arm (10) and the auxiliary rocker member (20) at a position of the locking pin (30) which is in proximity to the roller (12) of the rocker arm (10). Thus, this configuration of the locking pin (30) reduces the need for enhanced structural rigidity around the rotation axis (A-A) of the rocker arm (10), which is conventionally achieved by increasing size of the rocker arms. Further, the rocker unit (100) of the present disclosure eliminates need for heavier springs with increased stiffness to resist movement of the valves at varying speed rotation of the engines. Thus, the rocker unit of the present disclosure facilitates reduction in overall weight, thereby reducing inertia of the rocker unit (100). In one non-limiting embodiment of the present disclosure, the biasing member (35), the resilient support member (36, 38) and the flat resilient member (37), is made of a material resisting high forces and temperatures.

In an embodiment, the present disclosure provides a rocker unit (100) that is simple in construction, along with being robust and compact.
In an embodiment, the rocker unit (100) of the present disclosure eliminates increased size and weight of the rocker arm (10) and the auxiliary rocker member (20).
In an embodiment, the rocker unit (100) of the present disclosure reduces number of components for coupling the rocker arm (10) with the auxiliary rocker member (20) during high engine speeds.
In an embodiment, the rocker unit (100) of the present disclosure with provision locking pin (30) at the first end (11) of the rocker arm (10) reduces overall weight of the rocker unit (100), thereby reducing inertia and bending moment around the rotation axis of the rocker shaft (40).
Equivalents:
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or

"an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations.
In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope being indicated by the following claims.

A rocker unit (100) for an engine (200), the rocker unit (100) comprising:
a rocker arm (10) mounted on a rocker shaft (40), wherein the rocker arm (10) comprises:
a first end (11), including a roller (12) which contacts a first cam (51a) mounted on a cam shaft (50) to cause a reciprocating motion of the rocker arm (10) about an axis (A-A) of the rocker shaft (40);
a second end (13), including a valve lash adjuster (45) to operate at least one of an intake valve (204) and an exhaust valve (203) of the engine (200) based on the reciprocating motion of the rocker arm (10);
an auxiliary rocker member (20) disposed adjacent to the rocker arm (10) and extends towards the first end (11) of the rocker arm (10), wherein a free end (20b) of the auxiliary rocker member (20) contacts with a second cam (51b) mounted on the cam shaft (50); and
a locking pin (30) disposed in a first provision (15) defined in the first end (11) of the rocker arm (10) and the locking pin (30) being configured to be selectively received in a second provision (25) defined in the auxiliary rocker member (20) to couple the rocker arm (10) and auxiliary rocker member (20).
The rocker unit (100) as claimed in claim 1, comprises a biasing member (35) mounted on the cylinder head (201), wherein the biasing member (35) extends to support the auxiliary rocker member (20) and facilitate a constant contact of the free end (20b) of the auxiliary rocker member (20) with the second cam (51b) during the reciprocating motion of the auxiliary rocker member.
The rocker unit (100) as claimed in claim 2, wherein the biasing member (35) is a resilient flat strip having one end (35a) secured to the cylinder head (201) and another end (35b) biasing the auxiliary rocker member (20).
The rocker unit (100) as claimed in claim 1, wherein the auxiliary rocker member (20) is defined with a primary end (21) having a through hole to allow mounting of the auxiliary

rocker member (20) to the rocker shaft, and a secondary end (22) having the second provision (25) to receive the locking pin (30).
5. The rocker unit (100) as claimed in claim 4, wherein the secondary end (22) of the auxiliary rocker member (20) is defined with a predetermined curvature to abut and make the sliding contact with the second cam (51b) of the cam shaft (50).
6. The rocker unit (100) as claimed in claim 1, wherein the auxiliary rocker member (20) comprises:
a resilient support member (36) disposed between a hub (18) of the auxiliary rocker member (20) and the rocker shaft (40),
wherein the resilient support member (36) facilitates constant contact of the free end (20b) of the auxiliary rocker member (20) with the second cam (5 lb) of the cam shaft (50) during the reciprocating motion between the cam shaft (50) and the auxiliary rocker member (20).
7. The rocker unit (100) as claimed in claim 6, wherein the resilient support member (36) is a torsional spring secured to the hub (18) of the auxiliary rocker member (20) rocker.
8. The rocker unit (100) as claimed in claim 1, wherein the locking pin (30) is selectively actuated to slide from the first provision (15) towards the second provision (25) by a solenoid actuation mechanism.
9. The rocker unit (100) as claimed in claim 1, wherein the auxiliary rocker member (20) comprises:
a resilient support member (38) having a first end (38a) supported by a hub (18) of the rocker arm (10), and a second end (38b);
a coupling pad (24) supported by the second end (38b) of the resilient support member (38),

wherein the resilient support member (38) facilitates contact of the coupling pad (24) with the second cam (51b) of the cam shaft (50) during the reciprocating motion between the cam shaft (50) and the auxiliary rocker member (20); and
a securing pin (19) protrudes from the first end (11) of the rocker arm (10) to securely support the resilient support member (38).
10. The rocker unit (100) as claimed in claim 9, wherein the resilient support member (38) is a 'leaf spring having secured to the hub (18) of the rocker arm (10) and wherein the resilient support member (38) is defined with a guide channel (39) for receiving the securing pin (19).
11. The rocker unit (100) as claimed in claim 9, wherein the coupling pad (24) is defined with a groove (25) to receive the locking pin (30).
12. The rocker unit (100) as claimed in claim 1, wherein the auxiliary rocker member (20) comprises:
a flat resilient member (37) having a first end (37a) removably secured at a bottom portion of a hub (18) of the rocker arm (10) and a second end (37b); and a coupling pad (24) supported by the second end (37b) of the flat resilient member (37),
wherein the flat resilient member (37) facilitates contact of the coupling pad (24) with the second cam (51b) of the cam shaft (50) during the reciprocating motion between the cam shaft (50) and the auxiliary rocker member (20).
13. The rocker unit (100) as claimed in claim 12, wherein the coupling pad (24) is defined with a groove (25) to receive the locking pin (30).
14. The rocker unit (100) as claimed in claim 12, wherein the second end of the flat resilient member (37) is provided with a provision to accommodate the coupling pad (24), such that a free end (24b) is positioned below the flat resilient member (37) and the groove (25) is configured above the flat resilient member (37), respectively.

15. The rocker unit (100) as claimed in claim 1, wherein the auxiliary rocker member (20) is structured to make sliding contact with the second cam (51b) mounted on the cam shaft (50).