DESC:HYDRAULIC PRELOAD ADJUSTING DEVICE FOR REAR SHOCK ABSORBER
Field of the invention:
The present invention relates to vehicle suspension systems, and more particularly, to a device for varying the spring preload of a shock absorber in a two-wheeler motorcycle.
Background of the invention:
A shock absorber used on a motorcycle usually has a main spring that has the spring characteristics in accordance with the requirements, ordinarily in the form of a helical compression spring and a damper body that has a piston assembly immersed in damper oil to dampen the spring reaction in the system. Whenever the motorcycle absorbs impacts due to any disturbances from the road, the impact load will be absorbed by the main spring, and energy dissipation of the spring is controlled by the damping mechanism of the shock absorber.
The main coil spring is assembled on the shock absorber with a defined setting length, which is identified based on the motorcycle ride height requirements. This initial setting of spring preload may require to be changed by the rider based on different rider and pillion loading conditions.
The damper body will have an external thread on the outer periphery with which the preload adjuster plate is assembled by means of the thread interface. The main coil spring is kept in the setting condition between the spring seater and the preload adjuster plate in the shock absorber assembly. A change in the spring preload is carried out mechanically by means of a preload adjuster plate which can be displaced axially relative to the damper body at an external thread of the damper body, and which is pressurized by the main spring.
If the rider has to change the preload of the main spring, the preload adjuster plate is rotated on the damper body, due to which the spring starts to compress and exerts reaction force on the preload adjuster plate. When the spring preload requirement is high, due to spring reaction more effort is required to adjust the spring preload of the shock absorber. The preload adjuster plate needs to be rotated in the opposite direction to release the spring preload. When the spring preload is high, the spring exerts high reaction forces on the preload adjuster plate, which will be transferred to the external thread of the damper body, and to the engaging internal thread of the preload adjuster plate, so that the engaged threads of the damper body and preload adjuster plate are subject to high load and wear. Additionally, there is a risk of contamination in the area of the thread of the preload adjuster plate, which increases the risk of thread damage to the point of inoperability.
To reduce the effort required to adjust the spring preload in the shock absorber system, the mechanical preload adjusters are replaced with hydraulic preload adjusters.
A hydraulic spring preloader or preload adjuster from Öhlins Racing AB has become known. This preload adjuster has an adjuster case, an adjuster knob, an annular piston, a piston screw, and one screw hole. The screw hole is provided for air venting, oil filling, and motion conversion. Due to this screw, the initial factory setup of the piston position will be affected during service and maintenance. The annular piston and the piston screw are connected by metric thread, where the possibility of thread wearing is high due to the axial load acting on the piston surface. Further, the preload adjuster from Öhlins Racing AB has many components such as a quad ring as sealing, a thrust bearing between the piston screw and adjuster cap, and a circlip-supported clamp which increases the overall cost.
Accordingly, there exists a need to provide a device for adjusting the spring preload of the shock absorber that overcomes the above-mentioned drawbacks in the prior art.
Objects of the invention:
An object of the present invention is to provide a device for adjusting the spring preload in the shock absorber with lesser effort.
Another object of the present invention is to provide a remotely adjustable device for adjusting the preload of the main spring in a shock absorber where the accessibility is constrained due to vehicle layout.
Another object of the present invention is to provide a device for adjusting the preload of the main spring in the shock absorber by using a DC motor that can be integrated into the electronically controlled and can be operated by user inputs like electronic push buttons, potentiometers, etc.
Another object of the present invention is to improve the durability and reliability of the axial load-carrying capacity of the preload adjuster.
Another object of the present invention is to reduce the assembly time and improve the functioning of the preload adjuster by eliminating air volume from the oil chamber without priming.
Another object of the present invention is to provide ease for service and maintenance of the preload adjuster without affecting the initial factory setup.
Another object of the present invention is to allow independent servicing and maintenance of the preload adjuster parts.
Another object of the present invention is to provide a circular machined tube which gives an advantage to use this preload adjuster on the damper body with lugs as a retrofit kit.
Still, another object of the present invention is to establish a more convenient and accurate way of preload adjustment with dynamic observation by a laser-printed scale.
Yet another object of the present invention is to provide a cost-effective preload adjuster for the shock absorber.
Summary of the invention:
Accordingly, the present invention provides a preload adjusting device for adjusting the suspension characteristics of a spring of a shock absorber. The device being configured on a shock body at an upper end of a spring of the shock absorber. The device comprising an adjuster case having an annular band-like body with a wall and a cylinder, an adjuster case cap for encasing the cylinder, a bottom slider, and a knob. The cylinder comprises an oil reservoir, an oil-filling screw configured on the slant surface of the cylinder at the rear side thereof for facilitating oil filling in the oil reservoir, a piston, a piston screw, a dog-point screw positioned after the piston for linear motion, an O-ring, and a bottom slider. The bottom slider affixed inside the adjuster case wherein the outer surface of the bottom slider comprises a plurality of grooves for creating an oil channel and passages for the sealing rings in between the bottom slider and the adjuster case.
The knob functionally attached to the piston screw for providing rotation thereto.

The anti-clockwise rotation of the knob facilitates in oil displacement from the oil reservoir to the oil channel. This causes the bottom slider to telescopically extend in upward direction. When the movement of the bottom slider is constrained by the surface contact between the circular tube and the bottom slider, the adjuster case starts moving in a downward direction due to the fluid pressure which results in the compression of the spring.
The clockwise rotation of the knob facilitates in oil displacement of the oil channel to the oil reservoir, which causes the bottom slider to move in downward direction, consecutively allowing the adjuster case to move in an upward direction which results in the release of the spring.

Brief description of the drawings:
The objects and advantages of the present invention will become apparent when the disclosure is read in conjunction with the following figures, wherein
Figure 1 shows an overview of a device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 2 shows a schematic of a device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 3 shows a sectional view of a device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 4 shows a working mechanism of a device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 5 shows a schematic of an assembly interface of a device for adjusting a spring and a shock body of a shock absorber, in accordance with the present invention;
Figure 6 shows a schematic of a remotely operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 7 shows a sectional view of a remotely operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 8 shows a working mechanism of a remotely operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 9 shows a schematic of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 10 shows a sectional view of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 11 shows a working mechanism of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 12 shows a sectional view of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 13 shows an overview of the embodiments of the mechanical spring contacts of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention;
Figure 14 shows an overview of the sensor of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention; and
Figure 15 shows a control mechanism of an electronically operable device for adjusting a spring of a shock absorber, in accordance with the present invention.
Detailed description of the embodiments:
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques, and approaches are overcome by the present invention as described below in the preferred embodiments.
The present invention provides a device for adjusting the suspension characteristics of a spring of a shock absorber. The present device adjusts the preload of the spring of a shock absorber.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in brackets in the following description.
The hydraulic preload adjusting device (hereinafter, “the device (100)) for adjusting a spring preload of a shock absorber is shown in Figures 1 - 5. The shock absorber comprises a piston rod, a shock body (101) designed to surround the piston rod, and a spring (102). The device (100) can be disposed of on the shock body (101) to compress the spring (102). Additionally, the device (100) is configured on the upper end of the spring (102).
The device (100) comprises an adjuster case (10), an adjuster case cap (20), a bottom slider (30), and a knob (40).
The adjuster case (10) is an annular band-like body with a wall (11) parallelly incorporated at the outer surface on one side of the body and a cylinder (12) incorporated perpendicular to the wall axis on the body opposite to the wall (11). The wall (11) includes an air vent screw (13). The cylinder (12) is configured to create an oil reservoir therein. Further, the cylinder (12) comprises the oil reservoir (1), an oil-filling screw (2), a dog-point screw (3), a piston (4), a piston screw (5), and an O-ring (6).
The cylinder (12) is encased using the adjuster case cap (20). The oil-filling screw (2) is configured on the outer surface of the cylinder (12). In an exemplary embodiment, the oil-filling screw (2) is configured on the slant surface of the cylinder (12) at the rear side thereof. Further, the oil-filling screw (2) is configured for oil filling. Additionally, the oil-filling screw (2) is configured with a sealant for eliminating any oil leakage therefrom. The piston (4) and the piston screw (5) are interfaced using the buttress thread arrangement (BT). The buttress thread facilitates the high axial load-carrying capacity of the device (100). The O-ring (6) is used as a sealant to restrict oil flow through the piston (4). Further, the O-ring (6) is provided with a backup ring to withstand fluid pressure. The dog-point screw (3) is positioned after the piston (4) for linear motion. The knob (40) is functionally attached to the piston screw (5). The knob (40) is configured to rotate the piston screw (5). The rotation of the knob (40) facilitates linear movement of the piston (4). In an exemplary embodiment, the knob (40) is attached to the piston screw (5) using a bolt.
The air vent screw (13) is configured to remove the air volume from the oil reservoir (1) during oil filling. This in turn eliminates the priming operation during assembly and reduces the cycle time of the device (100).
The dog-point screw (3), air vent screw (13) and oil-filling screw (2) are provided to serve the dedicated purposes in the device (100) like rotational to linear conversion, elimination of air volume and oil filling therein respectively. Since each function is dedicated to individual parts, serviceability of the components without affecting one another’s function is possible.
In an exemplary embodiment, a shim plate is used to avoid friction between the piston screw (5) and the adjuster case cap (20).
The bottom slider (30) is affixed inside the adjuster case (10) in a way that the outer surface of the bottom slider (30) and the inner surface of the adjuster case (10) are adjacent to one another. The outer surface of the bottom slider (30) comprises a plurality of grooves. The plurality of grooves is configured to create an oil channel (31) and passages for the sealing rings in between the bottom slider (30) and the adjuster case (10). The bottom slider (30) further comprises a scale printed thereon to identify the pre-compressed length. This laser-printed scale on the device body allows the user to observe the preload adjustment dynamically. The oil channel (31) is in fluid communication with the oil reservoir (1) of the cylinder (12).
In an exemplary embodiment, a machined circular tube (17) with slots is provided to incorporate the lugs (18) on the shock body (101) to hold the position of the device (100) thereon. The top surface of the bottom slider (30) is made to have surface contact with the circular tube (17) which holds the position still.
The anti-clockwise rotation of the knob (40) is converted into the forward movement of the piston (4) with help of the dog-point screw (3), which results in the displacement of the oil from the oil reservoir (1) to the oil channel (31). The oil displacement causes the fluid volume to rise in the oil channel (31). Due to this rise in fluid volume, the bottom slider (30) starts moving in an upward direction. When the movement of the bottom slider (30) is constrained by the surface contact between the circular tube (17) and the bottom slider (30), the adjuster case (10) starts moving in a downward direction due to the fluid pressure which results in the compression of the spring (102).
The clockwise rotation of the knob (40) is converted into the backward movement of the piston (4), which results in the displacement of the oil from the oil channel (31) to the oil reservoir (1). The oil displacement causes a dip in the fluid volume in the oil channel (31). Due to this volume change, the bottom slider (30) starts moving in a downward direction. When the movement of the bottom slider (30) is constrained by the surface contact between the circular tube (17) and the bottom slider (30), the adjuster case (10) starts moving in an upward direction due to the fluid pressure which results in the release of the spring (102).
The forward motion of the piston (4) is restricted by the profile provided in the cylinder (12) and the backward movement is restricted by the dog-point screw (3) and slot interface of the piston (4).
In an exemplary embodiment, a machined circular tube (17) with slots is provided to incorporate the lugs (18) of the shock body (101) to hold the position of the device (100) thereon.
In an exemplary embodiment, the device (100) can be operated remotely to adjust the spring of the shock absorber. In the remotely operable device (100’), the adjuster case (10) is provided with a wall (11) parallelly incorporated at the outer surface on one side of the band and a banjo connector (11’) parallelly incorporated on the outer surface of band opposite to the wall (11). The banjo connector (11’) facilitates a fluidic connection between the adjuster case (10) and the cylinder (12) using a tube member (14) with a hollow passage for fluid flow. The tube member (14) is connected to the cylinder (12) using a male connector (MC). Here, the rotation of the knob (40) facilitates linear movement of the piston (4) which results in fluid flow between the adjuster case (10) and the cylinder (12) through the tube member (14). The fluid flow between the adjuster case (10) and the cylinder (12) results in a change of fluid volume in the oil reservoir (1), which facilitates the adjustment of the spring preload. Here, the wall (11) includes the air vent screw (13).
In an exemplary embodiment, the device (100) can be operated electronically to adjust the spring (102) of the shock absorber. In the electronic device (100”), the adjuster case (10) is provided with a wall (11) and a banjo connector (11’). The banjo connector (11’) facilitates a fluidic connection between the adjuster case (10) and the cylinder (12) using a tube member (14) with a hollow passage for fluid flow. The cylinder (12) comprises a motor casing (15) and a DC motor (16) in place of a knob. The DC motor (16) is attached to the motor casing (15) by means of counter-sunk screws. A thrust bearing (17) is placed between the piston screw (5) and the motor casing (15) to reduce the friction force therebetween. A slider washer (25) is attached on threaded side of the piston screw (5) and placed on a step profile inside the cylinder (12) to stop the forward movement of the piston screw (5). The cylinder (12) is attached with the motor casing (15) by means of counter-sunk screw (18). The cylinder (12) includes a plurality of provisions to incorporate at least two mechanical spring contacts (26). A sensor (27) is assembled on the piston (4) using a nylon holder (27d), a steel fixture (27c) and a screw (27a) and nut (27b). The Nylon holder (27d) is used to restrict the electrical supply with in the screw (27a) and nut (27b).
In an exemplary embodiment, the mechanical spring contact (26) can be made in either of two designs, as (26) and (26”), as shown in Figure 13. In an exemplary embodiment, the mechanical spring contact (26) contains a spring contact plate with helical spring (26a) assembled on a nylon pad (26b) which further attached on the cylinder (12) by means of a profile in the nylon pad (26b). In another exemplary embodiment, the mechanical spring contact (26”) contains a mechanical leaf spring plate (26c) inserted inside a profile in a nylon plate (26d) and assembled on the cylinder (12) by means of a nylon screw (26e).
A vehicle battery (28) of the two-wheeler motorcycle is utilized to supply an electrical voltage to the mechanical spring contact (26). The sensor (27) is connected to a controller (29) of the two-wheeler motorcycle. The input is fed through a user input console (32) of the two-wheeler motorcycle which passes to the controller (29). The controller (29) compares the user input with stored position of the piston (4) and sends signal to the DC motor (16) for rotation along with the direction. The DC motor (16) facilitates the rotation of the piston screw (5), which results in linear movement of the piston (4). Here, the linear movement of the piston (4) results in fluid flow between the adjuster case (10) and the cylinder (12) through the tube member (14). The fluid flow between the adjuster case (10) and the cylinder (12) results in a change of fluid volume in the oil reservoir (1), which facilitates the adjustment of the spring preload. The sensor (27) attached on the piston (4) detects the maximum position of the piston (4) by establishing an electrical contact between the sensor (27) and the mechanical spring contacts (26) assembled on the cylinder (12). Here, the wall (11) includes the air vent screw (13).
In an exemplary embodiment, the air vent screw (13) of the adjuster case wall (11) and the oil-filling screw (2) of the cylinder (12) is used for air venting and oil filling functionalities respectively.
Accordingly, the device (100) is capable of adjusting a spring preload of a shock absorber, where the device (100) can be operable manually, remotely, and electronically.
Advantages of the invention:
1. The present device reduces assembly time and improves the functioning of the preload adjuster by the elimination of air volume from the oil chamber without priming.
2. The present device allows independent servicing and maintenance of the hydraulic preload adjuster parts.
3. The present device provides high axial load-carrying capacity by the implementation of the buttress thread in the piston and piston screw interface.
4. The present device provides a cost-effective solution for hydraulic spring preload adjustment for the shock absorber.
5. The present device allows dynamic observation of preload adjustment in the shock absorber by means of a laser-printed scale.
6. The present invention is to provide a circular machined tube which gives the advantage of using this preload adjuster on a damper body with lugs as a retrofit kit.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application and to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the scope of the claims of the present invention.
,CLAIMS:We Claim:
1. A hydraulic preload adjusting device (100) for adjusting a spring preload of a shock absorber, the device (100) being configured on a shock body (101) at an upper end of a spring (102) of the shock absorber, the device (100) comprising
an adjuster case (10) having an annular band-like body with a wall (11) and a cylinder (12), the cylinder (12) comprises
an oil reservoir (1),
an oil-filling screw (2) configured on the slant surface of the cylinder (12) at the rear side thereof for facilitating oil filling in the oil reservoir (1),
a piston (4),
a piston screw (5), and
a dog-point screw (3) positioned after the piston (4) for linear motion; and
a bottom slider (30) affixed inside the adjuster case (10) wherein the outer surface of the bottom slider (30) comprises a plurality of grooves for creating an oil channel (31) and passages for the sealing rings in between the bottom slider (30) and the adjuster case (10);
wherein the anti-clockwise rotation of the piston screw (5) facilitates in oil displacement from the oil reservoir (1) to the oil channel (31), which causes the bottom slider (30) to telescopically extend in upward direction and upon constrained position of the bottom slider (30), the adjuster case (10) starts moving in a downward direction which results in the compression of the spring (102);
wherein the clockwise rotation of the piston screw (5) facilitates in oil displacement of the oil channel (31) to the oil reservoir (1), which causes the bottom slider (30) to move in downward direction, consecutively allowing the adjuster case (10) to move in an upward direction which results in the release of the spring (102).

2. The device (100) as claimed in claim 1, wherein the wall (11) is incorporated parallelly at the outer surface on one side of the annular band-like body.

3. The device (100) as claimed in claim 1, wherein the cylinder (12) is incorporated perpendicular to the axis of the wall (11) on the annular band-like body of the adjuster case (10) opposite to the wall (11) for manually adjusting the spring preload.

4. The device (100) as claimed in claim 1, wherein the wall (11) includes an air vent screw (13) for eliminating air volume from the oil chamber (1).

5. The device (100) as claimed in claim 1, wherein the piston (4) and the piston screw (5) are interfaced using the buttress thread arrangement (BT).

6. The device (100) as claimed in claim 1, wherein the O-ring (6) is provided with a backup ring to withstand fluid pressure.

7. The device (100) as claimed in claim 1, further comprising a knob (40) functionally attached to the piston screw (5) for providing manual rotation thereto.

8. The device (100) as claimed in claim 7, wherein the knob (40) is attached to the piston screw (5) using a bolt.

9. The device (100) as claimed in claim 1, wherein the outer surface of the bottom slider (30) and the inner surface of the adjuster case (10) are adjacent to one another.

10. The device (100) as claimed in claim 1, wherein the bottom slider (30) comprises a scale printed thereon to identify the pre-compressed length to observe the preload adjustment dynamically.

11. The device (100) as claimed in claim 1, wherein the oil channel (31) is in fluid communication with the oil reservoir (1) of the cylinder (12).

12. The device (100) as claimed in claim 1, further comprising a machined circular tube (17) with slots to incorporate at least two lugs (18) on the shock body (101) to hold the position of the device (100) thereon.

13. The device (100) as claimed in claim 1, wherein the cylinder (12) includes an O-ring (6) configured as a sealant for restricting oil flow through the piston (4).

14. The device (100) as claimed in claim 1, further comprising an adjuster case cap (20) for encasing the cylinder (12).

15. The device (100) as claimed in claim 1, wherein the forward motion of the piston (4) is restricted by a profile provided in the cylinder (12) and the backward movement is restricted by the dog-point screw (3) and slot interface of the piston (4).

16. The device (100) as claimed in claim 1, further comprises a banjo connector (11’) parallelly incorporated on the outer surface of the annular band-like body opposite to the wall (11) for facilitating a fluidic connection between the adjuster case (10) and the cylinder (12) using a tube member (14) with a hollow passage for fluid flow.

17. The device (100) as claimed in claim 13, wherein the banjo connector (11’) and the tube member (14) are configured to allow the cylinder (12) for remotely adjusting the spring preload.

18. A hydraulic preload adjusting device (100”) for electronically adjusting a spring preload of a shock absorber, the device (100”) being configured on a shock body (101) at an upper end of a spring (102) of the shock absorber, the device (100”) comprising

an adjuster case (10) having an annular band-like body with a wall (11) and a cylinder (12), the cylinder (12) comprising
an oil reservoir (1),
an oil-filling screw (2) configured on the slant surface of the cylinder (12) at the rear side thereof for facilitating oil filling in the oil reservoir (1),
a piston (4),
a piston screw (5),
a dog-point screw (3) positioned after the piston (4) for linear motion,
a motor casing (15), and
a DC motor (16) for electronically adjusting the spring preload;
a bottom slider (30) affixed inside the adjuster case (10) wherein the outer surface of the bottom slider (30) comprises a plurality of grooves for creating an oil channel (31) and passages for the sealing rings in between the bottom slider (30) and the adjuster case (10);
wherein the anti-clockwise rotation of the piston screw (5) facilitates in oil displacement from the oil reservoir (1) to the oil channel (31), which causes the bottom slider (30) to telescopically extend in upward direction and upon constrained position of the bottom slider (30), the adjuster case (10) starts moving in a downward direction which results in the compression of the spring (102);
wherein the clockwise rotation of the piston screw (5) facilitates in oil displacement of the oil channel (31) to the oil reservoir (1), which causes the bottom slider (30) to move in downward direction, consecutively allowing the adjuster case (10) to move in an upward direction which results in the release of the spring (102).
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19. The device (100”) as claimed in claim 18, wherein the DC motor (16) is functionally attached to the piston screw (5) via motor casing (15) using counter-sunk screws.

20. The device (100”) as claimed in claim 18, wherein the cylinder (12) further comprising

a thrust bearing (17) placed between the piston screw (5) and the motor casing (15) to reduce the friction force therebetween;
a slider washer (25) attached on threaded side of the piston screw (5) and placed on a step profile therein to stop the forward movement of the piston screw (5); and
a plurality of provisions to incorporate at least two mechanical spring contacts (26) and a sensor (27) on the piston (4).

21. The device (100”) as claimed in claim 20, wherein the sensor (27) is assembled on the piston (4) for detecting maximum position thereof using a nylon holder (27d), a steel fixture (27c), a screw (27a), and nut (27b).

22. The device (100”) as claimed in claim 20, wherein the mechanical spring contact (26) contains a spring contact plate with helical spring (26a) assembled on a nylon pad (26b) which further attached on the cylinder (12) by means of a profile in the nylon pad (26b).

23. The device (100”) as claimed in claim 20, wherein the mechanical spring contact (26”) contains a mechanical leaf spring plate (26c) inserted inside a profile in a nylon plate (26d) and assembled on the cylinder (12) by means of a nylon screw (26e).

24. The device (100”) as claimed in claim 18, further comprising a controller (29) connected to the sensor (27) and a user input console (32) for receiving a user input relating to the rotation direction.

25. The device (100”) as claimed in claim 18, wherein the controller (29) is configured on two-wheel motorcycle to compare the user input with stored position of the piston (4) and sends signal to the DC motor (16) for rotation along with the direction.

26. The device (100”) as claimed in claim 18, wherein the cylinder (12) includes an O-ring (6) configured as a sealant for restricting oil flow through the piston (4).

27. The device (100”) as claimed in claim 1, further comprising an adjuster case cap (20) for encasing the cylinder (12).

Dated this 12th day of December 2023

Prafulla Wange
(Agent for Applicant)
(IN-PA/2058)