FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13]
A HYDRAULIC MASTER CYLINDER ASSEMBLY FOR DECELERATION OF VEHICLE

FIELD OF INVENTION
The present invention relates to a hydraulic master cylinder assembly. More particularly, the present invention relates to the hydraulic master cylinder assembly for deceleration of vehicles.
BACKGROUND OF THE INVENTION
[0001] A deceleration system in vehicles inhibits motion by absorbing energy from the moving wheels of vehicle to decelerate the vehicle's momentum for stopping of moving vehicle. The deceleration system plays a crucial role in improving efficiency of the vehicles and providing auto safety in terms of prevention of road accidents, particularly for high-speed vehicles. [0002] In recent time, a gradual development has been carried out to provide an improved deceleration systems and methods for automotive vehicles. Various kinds of deceleration systems such as mechanical, hydraulic, anti-lock etc. have been gradually developed to meet the requirements of deceleration mechanism of vehicles in automobile industry. For actuation purpose drum-drum, disc-drum or disc-disc combinations are typically used.
[0003] In last few decades, a gradual evolution in automobile industry is being carrying out to provide an efficient deceleration system for two wheeled vehicles by means of synchronized deceleration system. In conventional deceleration system, the actuation of rear lever (on left handlebar in a scooter) or the pedal (foot-operated in a motorcycle), deceleration of only rear wheel will be achieved. If the force applied by the rider is high, the rear wheel may get lock (because of reduction in rear wheel reaction due to weight transfer to the front during deceleration), that might lead to an accident.
[0004] In synchronized deceleration system in two wheeled vehicles both the front and rear wheel brakes are applied simultaneously or synchronously, hence it reduces stopping distance of vehicle after application of brake and in turn reduces skidding and possibility of accidents. According to the government guidelines and

as per IS 14664-2010, now it is mandatory to implement synchronized deceleration system in two wheelers below 125 CC capacity.
[0005] Various synchronized deceleration system with mechanical or hydraulic actuation arrangements have been reported in the prior art. In case of hydraulic type of synchronized deceleration system, a hydraulic master cylinder assembly is used. The major problem with designing of such system involves increased number of parts such as plurality of links, hoses, cable mounting structures etc. in other words, it increases complexity, that also makes the system more expensive. Increase in number of moving parts also increases losses in the system and hence making system comparatively less efficient. [0006] Hence there is need to devise a hydraulic master cylinder assembly for deceleration of vehicle with less complexity that also reduces aforementioned drawbacks reported in prior art.
OBJECTS OF THE INVENTION
[0007] The main object of the present invention is to provide a hydraulic
master cylinder assembly for deceleration of front wheel during the synchronized deceleration as well as individual deceleration.
[0008] The another object of the present invention is to provide the hydraulic master cylinder assembly with less complexity for deceleration of vehicle.
[0009] The another object of the present invention is to provide the hydraulic master cylinder assembly with less number of moving parts for deceleration of vehicle.
[00010] The another object of the present invention is to provide the hydraulic master cylinder assembly with improved efficiency for deceleration of vehicle.
[00011] The another object of the present invention isto provide the hydraulic master cylinder assembly for deceleration of vehicle that is cost effective.

[00012] The another object of the present invention is to provide the hydraulic master cylinder assembly for deceleration of vehicle that is user friendly.
SUMMARY OF THE INVENTION
[00013] A hydraulic master cylinder assembly (100) for deceleration
of vehicle includes a master body (210) having at least one master piston (260); at least one spring (270); a first link (230) having at least one contact surface (230a) and at least one slot (235); a second link (240) having at least one force application mean (240a); and a pivot (PI), wherein the hydraulic master cylinder assembly (100) is configured to provide deceleration of front wheel of vehicle during a synchronized deceleration as well as an individual deceleration. An individual deceleration actuator (120), the first link (230), the second link (240) and the spring (270) are coaxially mounted at the pivot (PI) on master body (210) such that the individual deceleration actuator (120), the first link (230), and the second link (240) are rotatable about the pivot (P1). The first link (230) is positioned between the individual deceleration actuator (120) and the master piston (260) such that the contact surface (230a) of the first link (230) is abutted against the master piston (260). The contact surface (230a) of the first link (230) is configured to actuate the master piston (260) during the synchronized deceleration as well as the individual deceleration. The slot (235) of the first link (230) is configured to isolate the second link (240) from receiving the force exerted by the individual deceleration actuator (120) during the individual deceleration. The front cable connector (250) that receives the front wheel deceleration cable (190) is connected with the second link (240) through a pin joint (H1) at a second surface (240c) of the second link (240). The second link (240) is configured to rotate about the pivot (P1) in the direction of pulling force received from the front wheel deceleration cable (190) during the synchronous deceleration. The force application mean (240a) of the second link (240) is configured to abut against the second end (235b) of the slot (235) and to push the first link (230) in the direction of rotation of the second link (240) during the synchronized deceleration.

[00015] Fig. 1 shows an environment diagram of a hydraulic master cylinder assembly for deceleration of vehicle in a preferred embodiment of a present invention;
[00016] Fig. 2 shows a perspective view of the hydraulic master cylinder assembly for deceleration of vehicle in the preferred embodiment of the present invention; and
[00017] Fig. 2A shows a top view of the hydraulic master cylinder assembly for deceleration of vehicle in a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00018] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00019] If the specification states a component or feature "may", "can", "could", or "might" be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.

[00020] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the disclosure, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[00021] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[00022] The term "a synchronized deceleration", hereinafter described, refers to the synchronized deceleration of the rear wheel and front wheel of the vehicle.
[00023] The term "an individual deceleration", hereinafter described, refers to the individual deceleration of only front wheel of the vehicle.
[00024] An aspect of the present invention pertains to a master cylinder assembly for deceleration of the front wheel during the synchronized deceleration as well as the individual deceleration. Referring to Fig. 1 an environment diagram of a master cylinder assembly for two wheeled vehicles is shown in the preferred embodiment of the present invention. The hydraulic master cylinder assembly (100) is mounted in the proximity of an individual deceleration actuator (120). The hydraulic master cylinder assembly (100) is connected with a front brake caliper assembly (160) through a front wheel deceleration hose (170). A synchronized deceleration actuator (110) is connected with a mechanical equalizer assembly (130). The mechanical equalizer assembly (130) is further connected with the

master cylinder assembly (100) and a mechanical rear brake assembly (150) by means of a front wheel deceleration cable (190) and a rear wheel deceleration cable (180) respectively. The hydraulic master cylinder assembly (100) is configured for deceleration of front wheel of vehicle during the synchronized deceleration as well as the individual deceleration.
[00025] Fig. 2 and 2A show a perspective view and top view of the hydraulic master cylinder assembly for two wheeled vehicles respectively in the preferred embodiments of the present invention. Referring to Fig. 2 & Fig. 2 A, the hydraulic master cylinder assembly (100) includes a master cylinder body (210) having a master piston (260), a pivot (P1), a first link (230), a second link (240) and a spring (270) (not shown in Fig.). The first link having at least one contact surface (230a) and a slot (235). The second link (240) having a force application mean (240a), wherein the force application mean (240a) is positioned on a first surface (240b) of the second link (240). The individual deceleration actuator (120), the first link (230) and the second link (240) are coaxially mounted at the pivot (P1). [00026] The first link (230) is positioned between the individual deceleration lever (120) and the master piston (260) such that the contact surface (230a) of the first link (230) is abutted against the master piston (260) and configured to actuate the master piston (260) during the synchronized deceleration and the individual deceleration. The slot (235) of the first link (230) has a first end (235a) and a second end (235b) that is configured to isolate the deceleration actuator (240) from the force exerted by the individual deceleration actuator (120) during individual deceleration of front wheel.
[00027] The force application mean (240a) of the second link (240) is configured to abut against the second end (235b) of the slot (235) and to push the first link (230) in the direction of rotation of the second link during the synchronized deceleration of the vehicle. The second link (240) that receives the front wheel deceleration cable (190) is connected with the front cable connector (250) through a pin joint (H1) at a second surface (240c) of the second link (240).

The individual deceleration actuator (120), the first link (230), the second link (240) and a spring (270) (not shown in Fig.) are coaxially mounted at the pivot (PI) on master body (210), wherein the individual deceleration actuator (120), the first link (230), and the second link (240) are rotatable about the pivot (PI). The spring (270) (Not shown in Fig.) is adapted to hold back the individual deceleration actuator (120) during synchronized deceleration of the vehicle as well as to bring back the individual deceleration actuator (120) to its original position once it is released during individual deceleration of the front wheel.
[00028] Now referring to Fig. 1 through Fig. 2A the operational characteristics of the master cylinder assembly (100) during the synchronized deceleration and the individual deceleration is explained. During the synchronized deceleration, the mechanical equalizer assembly (130) is actuated by the synchronized deceleration actuator (110) for the synchronized deceleration of the rear wheel and front wheel of the vehicle. The mechanical equalizer assembly (130) distributes the obtained deceleration force between the rear wheel and front wheel, according to predefined load distribution ratio. Typically, the said load distribution ratio is 60:40 between rear wheel to front wheel respectively. Hence, as soon as the mechanical equalizer assembly (130) is actuated, the deceleration of rear wheel takes place thereby pulling of the rear wheel deceleration cable (180) that is connected between the mechanical equalizer assembly (130) and the mechanical rear brake assembly (150). Meanwhile, with reference to load distribution ratio between rear wheel to front wheel, load starts to transfer from the rear wheel to the front wheel of the vehicle. After completion of predefined delay designed for deceleration of the rear wheel to the front wheel, the deceleration of the front wheel starts. The front wheel deceleration cable (190) that is connected between the mechanical equalizer assembly (130) and the hydraulic master cylinder assembly (100) gets pulled by the mechanical equalizer assembly (130).
[00029] The front wheel deceleration cable (190)that is connected with the second link (240) thereby pulls the second link (240). Hence the second link (240) starts rotating about the pivot (PI) in the direction similar to the pulling force

received from the front wheel deceleration cable (190). As the force application mean (240a) of the second link (240) that is abutted against the second end (235b) of the slot (235), the force application mean (240a) starts pushing the first link towards the master piston (260) in the direction of rotation of the second link (240). As a result, the first link (230) also starts rotating in the direction similar to the second link (240). Hence the master piston (260) get pushed by the contact surface (230a) of the first link (230) to actuate the front brake caliper assembly (160).
[00030] In case of individual deceleration of front wheel, the individual deceleration actuator (120) is pressed. As a result, the first link (230) get pressed and the first link (230) starts rotating in the direction of the force exerted by the individual deceleration actuator (120). As the contact surface (230a) of the first link (230) is abutted against the master piston (260), the contact surface (230a) further pushes the master piston (260) to actuate the front brake caliper assembly (160).
[00031] The major advantage of said master cylinder assembly (100) is simple and compact design. The aim is to reduce number of movable parts and the cost of the assembly. Hence the mounting provisions required for the front wheel deceleration cable (190) is accommodated on the master body (210). The hydraulic master cylinder assembly (100) is capable of being actuated by the mechanical equalizer assembly (130) in case of synchronized deceleration of vehicle, similarly said master cylinder assembly (100) also enables the individual deceleration of the front wheel. During the individual deceleration of the front wheel, the second link (240) needs to be isolated from force exerted by the individual deceleration actuator (120), otherwise it may cause slackening of the front wheel deceleration cable (190). In the present invention the first link (230) is provided with the slot (235) that facilitates isolation of the second link (240). Similarly, to keep the individual deceleration actuator (120) idle during synchronized deceleration of rear wheel and front wheel, the spring (270) (Not shown in Fig.) is disposed at the pivot (PI) that restricts the movement of the individual deceleration actuator (120) during the synchronized deceleration.

[00032] List of reference numerals:
1. A hydraulic master cylinder assembly (100)
2. A synchronized deceleration actuator (110)
3. An individual deceleration actuator (120)
4. A mechanical equalizer assembly (130)
5. A mechanical rear brake assembly (150)
6. A front brake caliper assembly (160)
7. A front wheel deceleration hose (170)
8. A rear wheel deceleration cable (180)
9. A front wheel deceleration cable (190)
10. A master body (210)
11. A pivot (P1)
12. A first link (230)
13. A contact surface (230a)
14. A slot (235)
15. A first end (235a)
16. A second end (235b)

17. A second link (240)
18. A force application mean (240a)
19. a first surface (240b)
20. a second surface (240c)
21. A front cable connector (250)
22. A master piston (260)
23. A spring (270) (Not Shown in fig.)
24. A pin joint (H1)

We Claim:
1. A hydraulic master cylinder assembly (100) for deceleration of vehicle
comprising:
A master body (210) having at least one master piston (260);
At least one spring (270);
A first link (230) having at least one contact surface (230a) and at least one slot (235);
A second link (240) having at least one force application mean (240a); and
A pivot (P1), wherein the hydraulic master cylinder assembly (100) is configured to provide deceleration of front wheel of vehicle during a synchronized deceleration as well as an individual deceleration.
2. The hydraulic master cylinder assembly (100) for deceleration of vehicle as
claimed in claim 1, wherein an individual deceleration actuator (120), the first link
(230), the second link (240) and the spring (270) are coaxially mounted at the pivot
(P1) on master body (210) such that the individual deceleration actuator (120), the
first link (230), and the second link (240) are rotatable about the pivot (PI).
3. The hydraulic master cylinder assembly (100) for deceleration of vehicle as claimed in claim 1, wherein the first link (230) is positioned between the individual deceleration actuator (120) and the master piston (260) such that the contact surface (230a) of the first link (230) is abutted against the master piston (260),
4. The hydraulic master cylinder assembly (100) for deceleration of vehicle as claimed in claim 3, wherein the contact surface (230a) of the first link (230) is configured to actuate the master piston (260) during the synchronized deceleration as well as the individual deceleration.

5. The hydraulic master cylinder assembly (100) for deceleration of vehicle as
claimed in claim 1, wherein the slot (235) of the first link (230) is configured to
isolate the second link (240) from receiving the force exerted by the individual
deceleration actuator (120) during the individual deceleration.
6. The hydraulic master cylinder assembly (100) for deceleration of vehicle as claimed in claim 1, wherein the front cable connector (250) that receives the front wheel deceleration cable (190) is connected with the second link (240) through a pin joint (H1) at a second surface (240c) of the second link (240).
7. The hydraulic master cylinder assembly (100) for deceleration of vehicle as claimed in claim 6, wherein the second link (240) is configured to rotate about the pivot (P1) in the direction of pulling force received from the front wheel deceleration cable (190) during the synchronous deceleration.
8. The hydraulic master cylinder assembly (100) for deceleration of vehicle as
claimed in claim 1, wherein the force application mean (240a) of the second link
(240) is configured to abut against the second end (235b) of the slot (235) and to
push the first link (230) in the direction of rotation of the second link (240) during
the synchronized deceleration.
9. The hydraulic master cylinder assembly (100) for deceleration of vehicle as
claimed in claim 1, wherein the spring (270) is adapted to restrict the movement of
the individual deceleration actuator (120) during the synchronized deceleration.
10. The hydraulic master cylinder assembly (100) for deceleration of vehicle as
claimed in claim 1, wherein the force application mean (240a) is positioned on a
first surface (240b) of the second link (240).
Dated this on 23rdDay of October , 2020 For ADVIK HI-TECH PVT. LTD.