FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10 and rule 13]
“A CLUTCH PEDAL OPERATING SYSTEM AND A METHOD OF ASSEMBLING THEREOF”
NAME AND ADDRESS OF THE APPLICANT:
TATA MOTORS LIMITED, an Indian company having its registered office at Bombay
House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA.
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure is related to a mechanical clutch operating system for a motor vehicle. The disclosure more particularly relates to the design of the clutch pedal assisted by levers and linkages for clutch engagement and disengagement.
BACKGROUND OF THE DISCLOSURE
In case of conventional automobile clutch operation, there have been clutch booster, master and slave cylinders which are operated hydro-pneumatically. Master cylinder is mounted at the clutch pedal & clutch booster with slave cylinder is mounted at Clutch Housing.
The conventional automobile clutch pedal is connected with Master cylinder. Slave cylinder & master cylinder are connected with rubber hose carrying fluid. This fluid transfers power from clutch pedal to clutch booster. Fluid leakage may leads to clutch failure. Also this hydraulic arrangement is costly.
Thus, there exists a need to develop a clutch pedal arm operating system to overcome the above said drawback.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of innovated clutch pedal operating system as described in 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.
The disclosure provides a mechanical clutch pedal assembly for a vehicle comprising, a mounting bracket mounted on a fire wall of the vehicle. Further a clutch pedal arm consisting of an upper end and a lower end, wherein the upper end of the clutch pedal arm is pivotably mounted to the mounting bracket at a first pivot point and a pedal pad is mounted to the lower end of the clutch pedal arm. In addition, a first link consisting a first end and a second end, wherein said first end of the first link is connected to the clutch pedal arm at a predetremined location. Further, a bell crank lever consisting a first

end, a center area of pivot and a second end, in which the first end of the bell crank lever is connected to the second end of the first link and the second end of the bell crank lever is connected to one end of a clutch cable, wherein said bell crank lever is mounted pivotably to a first support bracket at a second pivot point through said center area of pivot. Also, a lever having a first end, a center area of pivot and a second end pivotably mounted to a second support bracket of the vehicle through said center area of pivot, wherein the first end of the lever is connected to other end of the clutch cable and a second link consisting a first end and a second end, wherein the first end of the second link is connected to the second end of the lever and a shifting lever is connected to the second end of the second link for engaging and disengaging the clutch.
A method of operating a mechanical clutch pedal operating system for a vehicle is provided as one aspect of the present disclosure. The method comprises displacing a clutch pedal arm mounted on a mounting bracket of a vehicle to disengage and engage a clutch, wherein said clutch pedal arm is connected to a first link which moves a bell crank lever pivotably connected to a first support bracket to pull a clutch cable which inturn moves a second link through a lever mounted on a second support bracket which is inturn mounted on gear box of the vehicle to convey the motion of the clutch pedal arm to a shifting lever for disengaging and engaging the clutch.
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 characteristic 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:

Fig 1 illustrates the schematic diagram of the arrangement of the clutch pedal arm with the bell crank lever according to the present disclosure.
Fig 2, illustrates the arrangement of the lever mounted to the second supporting bracket along with the shifting lever according to the present disclosure.
Fig 3 illustrates the perspective view of the clutch pedal operating system according to 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.
DETAIL 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 structures 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 spirit and 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.
It is to be noted at this point that all of the above described components, whether alone or in any combination, are claimed as being essential to the disclosure, in particular the details depicted in the drawings and reference numerals in the drawings are as given below.

Referral Numerals Description
101 Clutch pedal operating system
102 Mounting Bracket
103 Clutch Pedal Arm
104 First Pivot point
105 Pedal Pad
106 First Link
107 Bell Crank Lever
108 Clutch cable
109 First Support Bracket
110 Second Pivot Point
111 Lever
112 Second Support Bracket
113 Second Link
114 Shifting lever
115 Clutch cable support
The present disclosure is related to a mechanical clutch operating system (101) for a motor vehicle. The disclosure more particularly relates to the design of the clutch pedal operating system (101) assisted by levers for clutch engagement and disengagement.
In the case of the present invention, the Clutch is operated fully mechanically. In place of master & slave cylinder and booster; two levers are used, which gives mechanical advantage to reduce clutch pedal effort. Hydraulic line connecting the master cylinder to slave cylinder is replaced by a clutch cable which transfers power from clutch pedal to Clutch yoke with the help of levers assembled.
A new design of the mechanical clutch pedal mechanism is developed through this disclosure, to keep the pedal effort in acceptable range. The present disclosure discloses a clutch pedal operating system (101) provided with assistance in engaging and disengaging the clutch using levers which are mounted on supporting brackets.

According to the present disclosure a clutch pedal operating system (101) is illustrated through Figs. 1. The clutch pedal operating system (101) disclosed in the present disclosure is combination of a clutch pedal arm(103), a mounting bracket (102), a first link (106), a bell crank lever (107), a clutch cable (108), a lever (111) and a second link (113). The clutch pedal arm (103) in the clutch pedal operating system (101) consists of an upper end and a lower end. The upper end of the clutch pedal arm (101) is pivotably connected to the mounting bracket (102) at a first pivot point (104). The lower end of the clutch pedal arm (103) consists of a pedal pad (105). The pedal pad (105) is pressed in forward direction to disengage the clutch. Further the clutch pedal operating system (101) consists of a first link (106) having a first end and a second end. The first end of the first link is rigidly conneted to the clutch pedal arm (103) at a predetermined location. The clutch pedal operating system (101) is further provided with a bell crank lever (107). The bell crank lever (107) is mounted to a first supporting bracket (109) which is certainly mounted on fire wall of the vehicle. The bell crank lever (107) consists of a first end, center area of pivot and a second end. The first end of the bell crank lever (107) is rigidly connected to the second end of the first link (106). And said bell crank lever (107) is mounted to the first support bracket (109) through the center area of pivot. The second end of the bell crank lever (107) is connected to one end of a clutch cable (108). The clutch cable (108) transmitts the motion of the clutch pedal arm (103) to the clutch assembly.
Referring to Fig. 2, the other end of the clutch cable (108) is connected to a lever (111) mounted on a second supporting bracket (112) which is inturn mounted on gear box of the vehicle. The lever (111) pivotably mounted to the second supporting bracket (112) consists of a first end, a center area of pivot and a second end. The first end of the lever (111) is connected to one end of the clutch cable (108). Further the second end of the lever (111) is connected to a second link. And the lever (111) is pivotably mounted to the second mounting bracket (112) through the center area of pivot. The second link connected to the second end of the lever (111) consists of a first end and second end. A shifting lever (114) is connected to the second end of the second link (113). A ball end is formed at the connecting end of the second link (113) and shifting lever (114). Displacing the clutch pedal arm (103) displaces the shift lever (114) for disengaging the clutch.

Figs. 3 illustrate the prespective view of the clutch pedal operating system (101). The present disclosure relates to the clutch operating system operated by means of linkages and cable such that the whole system will be operated mechanically. With view to achieve this object two linkages are used instead of hydraulically operated master cylinder. When the clutch pedal arm (101) is pushed in the forward direction, force acting on the clutch pedal arm (101) is transmitted by means of the clutch cable (108) to the shift lever (114) to the release yoke and disengages the clutch.
In the present disclosure the clutch pedal arm (103) is mounted to mounting bracket (102) of the vehicle and the clutch pedal (103) is hinged by clutch pedal sleeve. Further to restrict the clutch pedal travel a clutch pedal stopper is provided on the mounting bracket (102). The pedal stopper is designed in such a manner that when the clutch pedal makes contact with it when the clutch has to be fully disengaged. Thus to reduce the effort on the clutch pedal, the clutch pedal is assembled with the first link
(106) and is mounted to the first support bracket (109) to operate the bell crank lever
(107) which moves in upward direction which causes the clutch cable (108) to pull the lever (111) which is mounted on the second support bracket (112) which is inturn mounted on the gear box. The clutch cable (108) is mounted by means of clutch cable support bracket (115) which is mounted on CAB firewall.
When the lever (111) is displaced it causes the second link (113) to displace the clutch shift lever (114) and thus movement of clutch shift lever (114) releases the yoke of the clutch rotation and causes the disengagement of clutch from the engine flywheel. Thus the person smoothly shifts or changes the gear while the vehicle is in motion.
During the disengagement, pressure plate of the clutch moves away from a friction disk of said vehicle. And air gaps are created between the flywheel, the friction disk, and the pressure plate. When the clutch is diaengaged no power can be transmitted through the clutch to fly wheel but as soon as the clutch pedal is released, power flows through the clutch to fly wheel. Springs provided in the clutch assembly pushes the pressure plate against the friction disk. This action clamps the friction plate tightly between the flywheel and the pressure plate.

The present disclosure reduces the cost of existing hydraulic system and operates fully mechanical by means of cable and levers which avoids the failure of the clutch pedal operation.
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 and spirit being indicated by the following claims.

We Claim:
1. A mechanical clutch pedal operating system (101) for a vehicle comprising:
a mounting bracket (102) mounted on a fire wall of the vehicle,
a clutch pedal arm (103) consisting of an upper end and a lower end, wherein the upper end of the clutch pedal arm (103) is pivotably mounted to said mounting bracket (102) at a first pivot point (104) and a pedal pad (105) is mounted to the lower end of the clutch pedal arm (103),
a first link (106) consisting a first end and a second end, wherein said first end of the first link (106) is connected to the clutch pedal arm (103) at a predetermined location,
a bell crank lever ( 107) consisting a first end, a center area of pivot and a second end, in which the first end of the bell crank lever (107) is connected to the second end of the first link and the second end of the bell crank lever (107) is connected to one end of a clutch cable (108), wherein said bell crank lever (107) is mounted pivotably to a first support bracket (109) at a second pivot point (110) through said center area of pivot,
a lever (111) having a first end, a center area of pivot and a second end pivotably mounted to a second support bracket (112) of the vehicle through said center area of pivot, wherein the first end of the lever (111) is connected to other end of the clutch cable (108),
a second link (113) consisting a first end and a second end, wherein the first end of the second link (113) is connected to the second end of the lever (111) and a shifting lever (114) is connected to the second end of the second link (113) for engaging and disengaging the clutch.
2. The clutch pedal assembly as claimed in claim 1, wherein the second link (113) is
having a ball end at the second end connecting with the shift lever (114).

3. The clutch pedal assembly as claimed in claim 1, wherein the mounting bracket (102) consists of a stopper to restrict the movement of the clutch pedal arm (103) beyond the clutch disengaging position.
4. The clutch pedal assembly as claimed in claim 1, wherein the clutch cable (108) is mounted on CAB firewall of the vehicle by means of clutch cable support (115).
5. The clutch pedal assembly as claimed in claim 1, wherein the clutch cable (108) is a push pull cable.
6. A method of operating a mechanical clutch pedal operating system (101) for a vehicle comprising:
displacing a clutch pedal arm (103) mounted on a mounting bracket (102) of a vehicle to disengage and engage a clutch, wherein said clutch pedal arm (103) is connected to a first link (106) which moves a bell crank lever (107) pivotably connected to a first support bracket (109) to pull a clutch cable (108) which inturn moves a second link (113) through a lever (111) mounted on a second support bracket (112) which is inturn mounted on gear box of the vehicle to convey the motion of the clutch pedal arm (103) to a shifting lever (114) for disengaging and engaging the clutch.