WO2020202199A1

WO2020202199A1 - Speed deceleration system of vehicle

Info

Publication number: WO2020202199A1
Application number: PCT/IN2020/050302
Authority: WO
Inventors: Deependra Singh Shekhawat; Vinit Vijay Deshpande
Original assignee: Hero MotoCorp Limited
Priority date: 2019-03-29
Filing date: 2020-03-28
Publication date: 2020-10-08

Abstract

A vehicle (100) is provided. The vehicle (100) comprises a speed deceleration system (200) configured to decelerate the vehicle (100). The speed deceleration system (200) comprises a front brake unit (101), a rear brake unit (102), a first brake actuating means (103), and a force distributing device (300). The force distributing device (300) is operatively coupled to the front brake unit (101), the first brake actuating means (103), and the rear brake unit (102). The force distributing device (300) is configured to distribute brake operating force generated by the first brake actuating means (103), to the front brake unit (132) and the rear brake unit (134). The force distributing device (300) comprises a first link (301) and a second link (302) rotatably coupled to the first link (301).

Description

SPEED DECELERATION SYSTEM OF VEfflCLE

FIELD OF INVENTION

[0001] The present invention relates to a vehicle, and more particularly, to a speed deceleration system of the vehicle. BACKGROUND

[0002] Conventionally in two wheeled vehicles braking operation of front wheel is generally actuated by application of force on a front brake lever provided on a handle bar and the braking operation of rear wheel is actuated by the application of force on a rear brake lever. The rear brake lever is generally provided on the handle bar or as a leg pedal of the vehicle. The operation of the front and rear wheel braking is normally controlled, by the operator, independently and sometimes simultaneously.

[0003] For safe braking of vehicle, the balanced actuation of front and rear wheel brakes is necessary. If only rear wheel brake is applied, the deceleration of the vehicle is insufficient to efficiently stop the vehicle in a shorter distance. If only the front wheel brake is applied, vehicle may face unsecured steering and leads to an accident if the front wheel gets lock. If both the front and rear wheel brakes are applied simultaneously such that both the wheels get locked, then the vehicle faces imminent danger of accident, thus there is a need of balanced actuation of front and rear wheels for safe and efficient braking of a vehicle. [0004] There are some conventional braking system available to actuate front and rear wheel brake device to decelerate the front and the rear wheels in balanced way, please refer patent document FR2735440A1. wherein the lever (7) is provided with the compensating element (12) for balanced braking of a rear wheel and a front wheel, however this type of braking configuration requires significant hand effort of the rider to actuate the lever (7), this is inconvenience to the rider in traffic conditions, as in traffic conditions the lever needs to actuate several times, this becomes more difficult for the female riders and aged person. SUMMARY

[0005] In one aspect of the present invention, a vehicle is provided. The vehicle comprises a body frame, a front wheel and a rear wheel. Each of the front wheel and the rear wheel is operatively coupled to the body frame. The vehicle also comprises a speed deceleration system. The speed deceleration system comprises a front brake unit operatively coupled to the front wheel. The front brake unit is configured to apply brake on the front wheel. The speed deceleration system also comprises a rear brake unit operatively coupled to the rear wheel. The rear brake unit is configured to apply brake on the rear wheel. The speed deceleration system further comprises a first force transmitting member operatively coupled to the front brake unit. The speed deceleration system comprises a first brake actuating means operatively coupled to the body frame, a second force transmitting member and a third force transmitting member operatively coupled to the rear brake unit. The speed deceleration system also comprises a force distributing device operatively coupled to the front brake unit, the first brake actuating means, and the rear brake unit. The force distributing device is configured to distribute brake operating force generated by the first brake actuating means, to the front brake unit and the rear brake unit. The force distributing device comprises a first link and a second link rotatably coupled to the first link. In an embodiment, the force distributing device comprises a cover casing configured to enclose the first link and second link. The force distributing device distributes the brake operating force to both the front brake unit and the rear brake unit, thereby decelerating quickly and at a shorter distance.

[0006] In an embodiment, actuation of the first brake actuating means generates brake operating force, which is transmitted to the second link through the first link. The second link is configured to transmit the brake operating force only to the rear brake unit, if there is no relative motion between the first link and the second link, and transmit the brake operating force to both the rear brake unit and the front brake unit, if there is relative motion between the first link and the second link. For smaller brake operating forces the second link only allows braking of the rear brake unit and for higher brake operating forces the second link allows actuation of both the front brake unit and the second brake unit.

[0007] In an embodiment, the first link comprises a first link first end, a first link second end and a first link intermediate portion. In an embodiment, the second link comprises a second link first end, a second link second end and a second link intermediate portion. The second link intermediate portion is rotatably coupled to the first link intermediate portion. In an embodiment, the second force transmitting member comprises an outer sheath and an inner wire. The outer sheath abuts the first link second end and the inner wire is coupled to the second link first end of the second link. In an embodiment, the third force transmitting member comprises an outer sheath and an inner wire. The inner wire is coupled to the second link second end of the second link and the rear brake unit, and the outer sheath abuts to the cover casing. This reduces the complexity of the force distributing device and a minimizes interference of one element with another. [0008] In an embodiment, the first force transmitting member embodies a hydraulic hose operatively coupled between the front brake unit and a master cylinder. The master cylinder is actuated by a second brake actuating means. In an embodiment, the second force transmitting member is operatively coupled to the second brake actuating means. The actuation of the second force transmitting member actuates the master cylinder. This facilitates in simultaneous actuation of the front brake unit and the rear brake unit. Further this facilitates in actuating the front brake unit when the front brake unit embodies a disc type brake device.

[0009] In an embodiment, the force distribution device actuates the rear brake unit and the front brake unit in sequential order. The rear brake unit is actuated by the movement of the inner wire coupled to the second link with respect to the outer sheath coupled to the cover casing, caused by the translational motion of the first link and the second link. The translational motion of the first link along with the second link facilitates in actuating the rear brake unit. [00010] In an embodiment, the force distribution device actuates the rear brake unit and the front brake unit in sequential order. The front brake unit is actuated by the movement of the outer sheath abutted against the first link with respect to the inner wire connected to the second link, caused by the relative motion between the first link and the second link. The relative motion between the first link and the second link actuates the front brake unit.

[00011] In another embodiment, the first force transmitting member embodies a cable operatively coupled between a second brake actuating means and the front brake unit. In another embodiment, the second force transmitting member is operatively coupled to the first brake actuating means and the front brake unit. This facilitates in actuating the front brake unit when the front brake unit embodies a drum type brake device.

BRIEF DESCRIPTION OF DRAWINGS

[00012] The invention itself, together with further features and attended advantages, will become apparent from consideration of the following detailed description, taken in conjunction with the accompanying drawings. One or more embodiments of the present invention are now described, by way of example only wherein like reference numerals represent like elements and in which:

[00013] Figure 1 illustrates a side view of an exemplary vehicle, according to an embodiment of the present invention;

[00014] Figure 2 illustrates a top view of an exemplary vehicle, according to an embodiment of the present invention;

[00015] Figure 3 illustrates a side view of a body frame of an exemplary vehicle, according to an embodiment of the present invention; [00016] Figure 4 illustrates a top view of a body frame of an exemplary vehicle, according to an embodiment of the present invention; [00017] Figure 5a illustrates layout of a speed deceleration system of the vehicle, according to the first embodiment of the present invention;

[00018] Figure 5b illustrates layout of a speed deceleration system of the vehicle, according to the second embodiment of the present invention; [00019] Figure 6 illustrates exploded view of a speed deceleration system of the vehicle, according to an embodiment of the present invention;

[00020] Figure 7a & 7b illustrate views of a first link of a speed deceleration system of the vehicle, according to an embodiment of the present invention;

[00021] Figure 8a, 8b & 8c illustrate views of a second link of a speed deceleration system of the vehicle, according to an embodiment of the present invention;

[00022] Figure 9a, 9b, 9c & 9d illustrate views of successive braking of a speed deceleration system of the vehicle, according to an embodiment of the present invention; and [00023] Figure 10 illustrates view of front fail situation of speed deceleration system of the vehicle, according to an embodiment of the present invention.

[00024] The drawings referred to in this description are not to be understood as being drawn to scale except if specifically noted, and such drawings are only exemplary in nature. DETAILED DESCRIPTION

[00025] While the invention is susceptible to various modifications and alternative forms, an embodiment thereof has been shown by way of example in the drawings and will be described here below. It should be understood, however that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the invention.

[00026] The term“comprises”, comprising, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, structure or method 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 structure or method. 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.

[00027] For better understanding of this invention, reference would now be made to the embodiment illustrated in the accompanying Figures and description here below, further, in the following Figures, the same reference numerals are used to identify the same components in various views. [00028] While the present invention is illustrated in the context of a vehicle, however, speed deceleration system and aspects and features thereof can be used with other type of vehicles as well. The terms “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, All-Terrain Vehicles (ATV) and the like.

[00029] 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 and these directions are referred by arrows Fr, Rr, U, Lr, L, R in the Figures. [00030] Referring to Figure 1, an exemplary vehicle (100) according to an embodiment of the present invention is depicted. The vehicle (100) referred to herein, embodies a scooter. Alternatively, the vehicle (100) may embody any other ridden vehicle such as motorcycle, three-wheeled vehicle, all-terrain vehicle (ATV) etc. without limiting the scope of the invention.

[00031] Figure 1 & 2 illustrate a schematic side view and top view of a vehicle (100) of conventional construction employing the present invention in the vehicle (100), the vehicle (100) comprising one or more body parts, such as a front fork (1), a handle bar (2), a front wheel (3), a seat (4), a tail light (5), a rear wheel (6), a front fender (7), a rear fender (8), a headlight (9), a rear grip (10), a foot peg (11), a master cylinder (12), a body frame (20) and a speed deceleration system (200). Each of the front wheel (3) and the rear wheel (6) is operatively coupled to the body frame (20). It may be noted that the vehicle (100) is shown to have include above stated parts, however those ordinarily skilled in the art would appreciate that the vehicle (100) includes other parts which may not be relevant for explaining the present invention and hence are not shown and described.

[00032] Figure 3 & 4 illustrate side and top view of the body frame (20) of vehicle (100)· The body frame (20) of vehicle (100) comprises a head pipe (21), a main frame pipe (22), a pair of seat rail pipes (23) such as a left seat rail pipe (23L) & a right seat rail pipe (23R) and a pair of sub frame pipes (24) such as a left sub frame pipe (24L) & a right sub frame pipe (24R). In an embodiment, body frame (20) further comprises one or more cross member such as a first cross member (25), a second cross member (26), a third cross member (27) and a fourth cross member (28). The head pipe (21) extends frontward and downward from the front portion of the body frame (20). The main frame pipe (22) extends downward and rearward from the head pipe (21) and becomes substantial horizontal. The first cross member (25) orthogonally connected to the rear end of the main frame pipe (22). The left seat rail pipe (23L) and the right seat rail pipe (23R) are extend upwardly and rearwardly from the left and right end of the first cross member (25) respectively. A second cross member (26), a third cross member (27) and fourth cross member (28) joins left seat rail pipe (23L) and right seat rail pipe (23R) from their front, mid and rear end thereof respectively. The left sub frame pipe (24L) and the right sub frame pipe (24R) are U shaped pipes; that extend outwardly from left seat rail pipe (23L) and the right seat rail pipe (23R) from their front end thereof respectively. The left sub frame pipe (24L) and the right sub frame pipe (24R) are used to mount foot peg (11) respectively.

[00033] The vehicle (100) comprises the speed deceleration system (200). The speed deceleration system (200) comprises a front brake unit (101), a rear brake unit

(102). The front brake unit (101) operatively coupled to the front wheel (3). The front brake unit (101) is configured to apply brake on the front wheel (3). More particularly, the front brake unit (101) stops or decelerates the front wheel (3). In an embodiment as shown in Figure 5a, the front brake unit (101) embodies a hydraulic brake device such as disc type brake unit. In another embodiment of the present invention as shown in Figure 5b, the front brake unit (101) is be a mechanical brake device such us drum type brake unit, without limitations.

[00034] Further, the rear brake unit (102) operatively coupled to the rear wheel (6). The rear brake unit (102) is configured to apply brake on the rear wheel (6). More particularly, the rear brake unit (102) stops or decelerates the rear wheel (6). In the illustrated example, the rear brake unit (102) embodies a mechanical brake device such us drum type brake unit. Alternatively, the rear brake unit (102) may be a hydraulic brake device such us disc type brake unit, or any other brake unit known in the art, without limitations. [00035] As much of the description of the speed deceleration system (200) having the hydraulic brake device as the front brake unit (101) and the speed deceleration system (200) having the drum type brake unit as the front brake unit (101) is similar apart from some differences, description of the speed deceleration system (200) having similar numbering is being used herein to describe both the embodiments. [00036] Referring to Figures 5a and 5b, the speed deceleration system (200) comprises a first brake actuating means (103), a second brake actuating means (104), a first force transmitting member (105), a second force transmitting member (106), a third force transmitting member (107) and a force distribution device (300). The force distributing device (300) operatively coupled to the front brake unit (101), the first brake actuating means (103), and the rear brake unit (102). The first force transmitting member (105) operatively coupled to the front brake unit (101). The second force transmitting member (106) comprises an outer sheath (106a) and an inner wire (106b). The third force transmitting member (107) is a brake cable connecting the force distributing device (300) to the rear brake unit (102) for rear wheel (6) braking. The third force transmitting member (107) comprises an outer sheath (107a) and an inner wire (107b).

[00037] Figure 5a illustrates first embodiment of the present invention, the second actuating means (104) embodies a right brake lever (hereinafter alternatively referred to as the right brake lever (104)). The right brake lever (104) is disposed on the right side of the vehicle (100). The right brake lever (104) is operatively coupled to the body frame (20). More particularly, the right brake lever (104) is rotatably supported on the handle bar (2) rotatably coupled to the body frame (20). The right brake lever (104) is actuated by the right hand of the rider. The right brake lever (104) is embodied as a front brake operating device. The master cylinder (12) disposed on the right side of the vehicle (100) at the handle bar (2). In the illustrated example, the first force transmitting member (105) is a hydraulic hose fluidically connects the master cylinder (12) to a caliper (not shown) of the front brake unit (101). The right brake lever (104) is operatively coupled to the master cylinder (12) to actuate the front brake unit (101) for front wheel (3) braking.

[00038] In the illustrated example, the first brake actuating means (103) embodies the left brake lever (hereinafter alternatively referred to as (left brake lever (103)). The left brake lever (103) is disposed on the left side of the vehicle (100). The left brake lever (103) is actuated by the left hand of the rider. The left brake lever (103) is rotatably supported on the handle bar (2).

[00039] The force distributing device (300) is disposed adjacent to the left brake lever (103). The force distributing device (300) is a device that distributes the brake operating force of the left brake lever (103) to the front brake unit (101) and the rear brake unit (102). The force distributing device (300) transmits brake operating forces to the front brake unit (101) via the second force transmitting member (106) and the rear brake unit (102) via the third force transmitting member (107). The second force transmitting member (106) is a brake cable operatively connected to the force distributing device (300) and the master cylinder (12) via a link (not shown) or a lever

(not shown) to actuate the master cylinder (12) for front wheel (3) braking.

[00040] Figure 5b illustrates second embodiment of the present invention, the second actuating means (104) embodies a right brake lever (hereinafter alternatively referred to as the right brake lever (104)). the right brake lever (104) is disposed on the right side of the vehicle (100). The right brake lever (104) is rotatably supported on the handle bar (2). The right brake lever (104) is actuated by the right hand of the rider. The right brake lever (104) is embodied as a front brake operating device. The first force transmitting member (105) is a brake cable operatively connects the right brake lever (104) to the front brake unit (101) to actuate the front brake unit (101) for front wheel (3) braking. The first force transmitting member (105) comprises an outer sheath (105a) and an inner wire (105b).

[00041] The left brake lever (103) is disposed on the left side of the vehicle (100). The left brake lever (103) actuated by the left hand of the rider. The left brake lever (103) is rotatably supported on the handle bar (2). [00042] The force distributing device (300) is disposed adjacent to the left brake lever (103). The force distributing device (300) is a device that distributes the brake operating force generated by the left brake lever (103) to the front brake unit (101) and the rear brake unit (102). The force distributing device (300) transmits brake operating forces to the front brake unit (101) via the second force transmitting member (106) and the rear brake unit (102) via the third force transmitting member (107). The second force transmitting member (106) is a brake cable operatively connects the force distributing device (300) to the front brake unit (101) to actuate the front brake unit (101) for front wheel (3) braking. The second force transmitting member (106) comprises an outer sheath (106a) and an inner wire (106b). The third force transmitting member (107) is a brake cable connects the force distributing device (300) to the rear brake unit (102) for rear wheel (6) braking. The third force transmitting member (107) comprises an outer sheath (107a) and an inner wire (107b).

[00043] In yet another embodiment of the present invention (not shown) the second force transmitting member (106) operatively couples the force distributing device (300) to the first force transmitting member (105) via one or more links or a lever to push the outer sheath (105a) of the first force transmitting member (105) or pull the inner wire (105a) of the first force transmitting member (105) to actuate the front brake unit (101) for front wheel (3) braking. [00044] As the same force distribution device (300) can being used in all the above embodiments, a generic description of the force distribution device (300) which is applicable equally to all the above mentioned embodiments is disclosed below.

[00045] Referring to Figure 6, the force distributing device (300) comprises a first link (301), a second link (302) and a cover casing (303). The second link (302) rotatably coupled to the first link (301). The cover casing (303) is disposed adjacent to the left brake lever (103) on handle bar (2) and is configured to cover/enclose the first link (301) and the second link (302).

[00046] Referring to Figure 7a and Figure 7b, the first link (301) is substantial “L” shaped member. The first link (301) comprises a first link first end (301a), a first link second end (301b) and a first link intermediate portion (301c).

[00047] Referring to Figure 8a, Figure 8b and Figure 8c, the second link (302) comprises a second link first end (302a), a second link second end (302b) and a second link intermediate portion (302c). The second link (302) is a sheet metal part made of two parallel sheet metal parts (302’) & (302”) joins each other by a stopper (S) at the second link first end (302a) of the second link.

[00048] Referring to Figure 6, the first link (301) and the second link (302) are rotatably coupled to each other from first link intermediate portion (301c) of the first link (301) and second link intermediate portion (302c) of the second link (302). The first link first end (301a) of the first link (301) is operatively coupled to the left brake lever (103). The second link (302) is operatively coupled to the second force transmitting member (106) and the third force transmitting member (107) in such a way that the inner wire (106b) of the second force transmitting member (106) is coupled to the second link first end (302a) of the second link (302) and the inner wire (107b) of the third force transmitting member (107) is coupled to the second link second end (302b) of the second link (302).

[00049] As the outer sheath (107a) of the third force transmitting member (107) abuts to the cover casing (303) and the outer sheath (106a) of the second force transmitting member (106) abuts to the first link second end (301b) of the first link (301), this configuration reduces significant hand effort of the rider to pull the left brake lever (103), and enable convenient ride for the rider, as less hand effort is required to actuate left brake lever (103) for braking, this truly helps the female riders and aged person riders.

[00050] Actuation of the left brake lever (103) generates brake operating force, which is transmitted to the second link (302) through the first link (301). The second link (302) transmits the brake operating force only to the rear brake unit (102), if there is no relative motion between the first link (301) and the second link (302). The second link (302) transmits the brake operating force to both the rear brake unit (102) and the front brake unit (101), if there is relative motion between the first link (301) and the second link (302). The force distribution device (300) actuates the rear brake unit (102) and the front brake unit (101) in sequential order. The rear brake unit (102) is actuated by the movement of the inner wire (107b) coupled to the second link (302) with respect to the outer sheath (107a) coupled to the cover casing (303), caused by the translational motion of the first link (301) and the second link (302). The front brake unit ( 101 ) is actuated by the movement of the outer sheath (106a) abutted against the first link (301) with respect to the inner wire (106b) connected to the second link (302), caused by the relative motion between the first link (301) and the second link (302)

[00051] Referring to Figure 9a, Figure 9b, Figure 9c & Figure 9d illustrate views of successive braking of a speed deceleration system of the vehicle, wherein Figure 9a shows initial stage of the left brake lever (103) in no load condition where rider not pressing the left brake lever (103). Figure 9b shows successive stage of the speed deceleration system when rider starts pressing the left brake lever (103) the first link (301 ) starts moving along with the second link (302) towards the left brake lever (103), this pulls the inner wire (107b) of the third force transmitting member (107) as the outer sheath (107a) of the third force transmitting member (107) abuts to the cover casing (303). This actuates the rear brake unit (102) for rear wheel (6) braking, however the first link second end (301b) of the first link (301) and second link first end (302a) of the second link (302) are not moving outward from each other, and the outer sheath (106a) of the second force transmitting member (106) abuts to the first link second end (301b) of the first link (301), thus only rear brake unit (102) actuates for the rear wheel (6) braking. Figure 9c shows successive stage of the speed deceleration system when rider further press the left brake lever (103), this further move the first link (301) along with the second link (302) towards the left brake lever (103), this further pulls the inner wire (107b) of the third force transmitting member (107) for further rear wheel (6) braking and the first link second end (301b) of the first link (301) and second link first end (302a) of the second link (302) start moving outward from each other, this pulls the inner wire (107b) of the third force transmitting member (107) to actuate the front brake unit (101) for front wheel (3) braking, in the first embodiment the front brake unit (101) actuated by the master cylinder (12) via one or more link or by any lever. In the second embodiment the front brake unit (101) actuated directly by the second force transmitting member (106). In yet another embodiment (not shown) the second force transmitting member (106) operatively coupled the force distributing device (300) to the first force transmitting member (105) via one or more links or a lever to push the outer sheath (105a) of the first force transmitting member (105) or pull the inner wire (105a) of the first force transmitting member (105) to actuate the front brake unit (101) for front wheel (3) braking. Figure (9d) shows last stage of the left brake lever (103), when rider pressed the left brake lever (103) completely, wherein the first link second end (301b) of the first link (301) and second link first end (302a) of the second link (302) moved outward from each other completely, thus the front brake unit (101) and the rear brake unit ( 102) actuated by the second force transmitting member (106) and the third force transmitting member (107) for optimize proportionate braking of the front wheel (3) and the rear wheel (6), and furthermore more front wheel (3) braking is not possible, as the stopper

(5) rests on the first link intermediate portion (301c) of the first link (301) and does not allow the first link second end (301b) of the first link (301) and second link first end (302a) of the second link (302) to move outward from one other, this restricts further front wheel (3) braking, thus the stopper (S) acts as a front limiter to avoid front wheel locking due to excessive braking.

[00052] Figure 10 illustrates a front fail condition of the speed deceleration system (200), i.e. in the case when the second force transmitting member (106) fails and if rider applies force on the left brake lever (103), at least rear brake unit (102) gets actuated for rear wheel (6) braking; to achieve this, the stopper (S) is provided at the second link first end (302a) of the second link (302), when rider presses the left brake lever (103) in front fail condition (When an inner wire (106b) of the second force transmitting member (106) is damaged) the second link (302) rotates and the stopper (S) rest on the first link intermediate portion (301c) of the first link (301) and not allow further rotation of the second link (302), this allows atleast the rear brake unit (102) actuation by the second force transmitting member (106) for the rear wheel

(6) braking, in the front fail condition and enhance safety in the vehicle, thus the stopper (S) also act as a failsafe device.

[00053] The present invention relates to the speed deceleration system (200) having a force distribution device (300) which can be used for both hydraulic and drum type front brake units (101). The force distribution device (300) provides a cost effective of distributing the generated brake operating forces to the front brake unit (101) and the rear brake unit (102). Further, the force distribution device (300) provides a fail-safe solution, ensuring actuation of the rear brake unit (102), even in case of breakage or non- working of the second force transmitting member (106). The force distributing device (300) is less complex and requires significantly less hand effort of the rider to actuate the first brake actuating means (103), thereby increasing the convenience of the all riders including the female riders and aged person riders, during traffic conditions.

[00054] While few embodiments of the present invention have been described above, it is to be understood that the invention is not limited to the above embodiments and modifications may be appropriately made thereto within the spirit and scope of the invention.

[00055] While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Claims

We Claim:

1. A vehicle (100) comprising:

a body frame (20);

a front wheel (3) and a rear wheel (6), wherein each of the front wheel (3) and the rear wheel (6) is operatively coupled to the body frame (20); and a speed deceleration system (200) comprising:

a front brake unit (101) operatively coupled to the front wheel (3), wherein the front brake unit (101) is configured to apply brake on the front wheel (3);

a rear brake unit (102) operatively coupled to the rear wheel (6), wherein the rear brake unit (102) is configured to apply brake on the rear wheel (6);

a first force transmitting member (105) operatively coupled to the front brake unit (101);

a first brake actuating means (103) operatively coupled to the body frame (20);

a second force transmitting member (106);

a third force transmitting member (107) operatively coupled to the rear brake unit (102); and

a force distributing device (300) operatively coupled to the front brake unit (101), the first brake actuating means (103), and the rear brake unit (102), wherein the force distributing device (300) is configured to distribute brake operating force generated by the first brake actuating means (103), to the front brake unit (132) and the rear brake unit (134), wherein the force distributing device (300) comprises:

a first link (301); and a second link (302) rotatably coupled to the first link

(301).

2. The vehicle (100) as claimed in claim 1, wherein the force distributing device (300) comprises a cover casing (303) configured to enclose the first link (301) and second link (302).

3. The vehicle (100) as claimed in the claim 2, wherein actuation of the first brake actuating means (103) generates brake operating force, which is transmitted to the second link (302) through the first link (301), wherein the second link (302) is configured to:

transmit the brake operating force only to the rear brake unit (102), if there is no relative motion between the first link (301) and the second link (302); and transmit the brake operating force to both the rear brake unit (102) and the front brake unit (101), if there is relative motion between the first link (301) and the second link (302).

4. The vehicle (100) as claimed in claim 3, wherein the first link (301) comprises a first link first end (301a), a first link second end (301b) and a first link intermediate portion (301c).

5. The vehicle (100) as claimed in claim 4, wherein the second link (302) comprises a second link first end (302a), a second link second end (302b) and a second link intermediate portion (302c), wherein the second link intermediate portion (302c) is rotatably coupled to the first link intermediate portion (301c).

6. The vehicle (100) as claimed in the claim 5, wherein the second force transmitting member (106) comprises an outer sheath (106a) and an inner wire (106b), wherein the outer sheath (106a) abuts the first link second end (301b) and the inner wire (106b) is coupled to the second link first end (302a) of the second link (302);

7. The vehicle (100) as claimed in the claim 5, wherein the third force transmitting member (107) comprises an outer sheath (107a) and an inner wire (107b), wherein the inner wire (107b) is coupled to the second link second end (302b) of the second link (302) and the rear brake unit (134), and the outer sheath (107a) abuts to the cover casing (303).

8. The vehicle (100) as claimed in the claims 6 and 7, wherein the first force transmitting member (148) embodies a hydraulic hose operatively coupled between the front brake unit (101) and a master cylinder (12) actuated by a second brake actuating means (104).

9. The vehicle (100) as claimed in the claim 8, wherein the second force transmitting member (106) is operatively coupled to the master cylinder (12).

10. The vehicle (100) as claimed in the claims 6 and 7, wherein the force distribution device (300) actuates the rear brake unit (102) and the front brake unit (101) in sequential order, wherein the rear brake unit (102) is actuated by the movement of the inner wire (107b) coupled to the second link (302) with respect to the outer sheath (107a) coupled to the cover casing (303), caused by the translational motion of the first link (301) and the second link (302).

11. The vehicle (100) as claimed in the claim 9, wherein the force distribution device (300) actuates the rear brake unit (102) and the front brake unit (101) in sequential order, wherein the front brake unit (101) is actuated by the movement of the outer sheath (106a) abutted against the first link (301) with respect to the inner wire (106b) connected to the second link (302), caused by the relative motion between the first link (301) and the second link (302).

12. The vehicle (100) as claimed in the claim 6 and 7, wherein the first force transmitting member (148) embodies a brake cable operatively coupled between a second brake actuating means (104) and the front brake unit (101). 13. The vehicle (100) as claimed in the claim 12, wherein the second force transmitting member (106) is operatively coupled to the first brake actuating means (103) and the front brake unit (101).

14. The vehicle (100) as claimed in claims 4 and 5, wherein the first link (301) is substantially L-shaped member, and the second link (302) comprises two parallel sheet metal parts (302’) & (302”) joined to one another by a stopper (S).