Annular Piston Brake Auto Adjustment Mechanism
Patent Information
Abstract
Abstract: A parking brake integrated annular piston brake with self adjusting mechanism for automotive application consisting of a housing, an inner seal, an outer seal, a piston, an actuating disc, a washer, a plunger, a ball, three springs, a lever, a split pin, a guide pin, three friction discs, three intermediate discs, inlet pipe assembly and bleed pipe assembly. The present invention operates the brake during parking and in case of emergency. Further the present invention parking brake integrated self adjusting annular piston brake compensates for the wear of the friction material, without any manual external intervention.
Applicants
Brakes India Private Limited
Inventors
1. Hariharasubramaniam Ramasubramanian
2. Krishnamurthy Padmanaban
Specification
Claims:We claim:
1. A parking brake integrated annular piston brake with self adjusting mechanism for automotive application comprising of
a housing (1),
an inner seal (2),
an outer seal (3),
a piston (4),
an actuating disc (5),
a washer (6),
a plunger (7),
a ball (8),
three springs (9),
a lever (10),
a split pin (11),
a guide pin (12),
three friction discs (13)
three intermediate discs (14)
inlet pipe assembly (15) and
bleed pipe assembly (16)
characterised in that the housing is modified to house the annular piston (4) with seal groove to assemble set of seals as inner brake seal (2) and outer brake seal (3), friction discs (13) being assembled in between surface hardened stationary intermediate discs (14) and having splines to mating with brake shaft (6) for rotation, an inlet pipe assembly (15) being connected with housing to send pressurized fluid to annular piston brake and a bleed pipe assembly (16) is connected at other end of housing to bleed the system during filling the oil in the system..
2. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1, wherein an integrated parking brake is provided in the center of the annular piston brake containing a set of three hardened steel balls (8) housed inside the actuation disc (5) and a set of return springs (9) to pull back actuation disc (5) to home position.
3. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1, wherein a mechanical parking brake is provided in the center of the annular piston brake with the lever (10) to connect parking brake cable with hand brake lever at driver cabin with a set of balls (8) located in the ramp cavities in actuator disc (5), between the actuator disc (5) and intermediate discs (14).
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4. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when the brake is applied, fluid pressure inside housing (1) pushes the piston (4) against deflection of brake seals (2 and 3) and then pushes friction plates (13) and intermediate plates (14) to stop or slow the vehicle speed, the piston (4) sliding in between brake seals (2 and 3) if the piston (4) travel is more than the deflection of brake seal (2 and 3).
5. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when fluid pressure in the housing (1) is withdrawn, the piston (4) comes to home position due to elastic effect of brake seals (2 and 3) creating the desired clearance between friction (13) and intermediate discs (14).
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6. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when the parking brake is applied, a lever (10) connected with actuation disc (5) rotates and pushes the friction discs (13) and intermediate discs (14) to stop or slow the rotation of brake.
7. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when the brake pedal is pressed, the piston in the master cylinder moves and brake oil pressure is increased and applied to the brake housing (1) through the connecting inlet pipe (16), the piston (4) pressing the brake friction disc (13) rotating with the brake shaft (6) to result in brake application.
8. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when brake is applied, pressure in the housing (1) rises, and the piston (4) moves in the forward direction to press the brake friction discs (13), brake seals (2 and 3) being fitted to the housing and subject to elastic deflection.
9. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when the brake is released, pressure in the housing (1) reduces, due to which brake seals (2 and 3) tend to restore their original form, this force returning the piston (4) as much as the brake seals (2 and 3) have been deflected as a result of which it returns to its origin position, a clearance thus being maintained between the brake discs (13 and 14) and the brake piston (4).
10. A parking brake integrated annular piston brake with self adjusting mechanism as claimed in Claim 1 and working thereof, wherein when the hand brake lever (10) is applied, the actuator disc (5) provided in the parking brake cage is rotated and the ball (8) provided in the actuator rides over ramp cavities, the brake friction discs (13) rotating with the brake shaft (6) and being pressed by actuator provided tin he parking brake cage causing frictional force to provide the braking effect.
.
Dated this 29th day of July 2016
N. Surya Senthil – IN/PA-736
For JUS MAXIMA LAW OFFICES
To (Agent for Applicant)
The Controller of Patents
Patent Office in Chennai
, Description:PARKING BRAKE INTEGRATED ANNULAR PISTON BRAKE WITH SELF ADJUSTING MECHANISM
FIELD OF THE INVENTION
This invention relates to mechanical engineering, specifically automobile engineering and relates to a brake system. This invention relates to a parking brake integrated annular piston brake with self adjusting mechanism for automotive application.
BACKGROUND OF THE INVENTION
As the friction material in an oil immersed brake (OIB) wears off due to repeated brake applications, the brakes must be constantly readjusted to maintain certain clearance between discs; otherwise, the pedal travel will increase, giving an unsafe feeling for the driver. Conventionally, in a disc brake without auto adjuster, the brakes are manually inspected at regular periodic intervals and are manually adjusted. This type of manual adjustment of brakes involves time and hence money. If there were an automatic adjustment feature in an oil immersed brake, which would sense the wear of the friction material and compensate for the wear without having to externally meddle with the brakes. Such a feature would reduce down time and hence save a lot of money. Moreover, if this feature would provide a compensation (or adjustment) in such a way that it would maintain constant clearance between the friction disc and intermediate disc at all times. This makes pedal travel will fall within a narrow band, which is a desirable feature.
Therefore it is the need of the hour is to develop an automatic adjustment feature that is concealed and protected from these operating parameters for enhanced automotive performance. In passenger car normally fitted with auto adjusted brake that compensate for wear of friction material. In hitherto available Tractor brakes, no automatic adjustment feature is available in India.
Some of the prior art in this field reveal various improvements made over the years in the art in brakes for better working and efficacy.
United States Patent 4635760 claims a disk brake with automatic adjustment of the type incorporating a sliding calliper (10), a brake actuator (12) acting directly upon a first friction component (14) and, by reaction through the calliper (10), upon a second friction component (16), the brake actuator (12) incorporating a mechanical control (32) acting upon a hydraulic control piston (20) through an automatic adjustment device. The automatic adjustment device consists of a screw and nut system (46-60) of reversible pitch which is capable of being actuated by the hydraulic piston (20) beyond a predetermined travel of the latter, the adjustment device incorporating an annular component (76), firmly fixed in rotation to the nut and co-operating with a control piston (64), immobilizing the annular component (76) in rotation when the hydraulic pressure acting upon the hydraulic control piston (20) reaches a predetermined value. According to the invention, the hydraulic piston (20) and the control piston (64) are coaxially mounted one inside the other, and co-operate in sealed reversible sliding thus allowing the hydraulic piston (20) to be dismantled as a unit from the control piston (64), from the annular component (76) and from the nut (60).
United States Patent 4629038 discloses a disc brake with automatic adjustment incorporating a calliper (10) mounted so as to slide on a fixed support by way of at least one axial pillar, a brake actuator (34) acting directly upon a first friction component, and by reaction through the calliper, upon a second friction component, the brake actuator (34) incorporating a mechanical control (48-50-60) acting upon a hydraulic control piston (36) through an automatic adjustment device (66), the adjustment device (66) being formed by a screw and nut system (68-70), which has a pitch which allows reverse action, and is capable of being actuated by the hydraulic piston (36) beyond a predetermined travel of the latter, the adjustment device (66) incorporating a sleeve (104) firmly fixed in rotation to the nut (70) and cooperating with annular control piston (80) which is capable of moving so as to besealed relative to the screw (68) and relative to the brake actuator (34), the control piston (80) immobilizing the sleeve (104) in rotation and in translation when the hydraulic pressure acting on the hydraulic control piston (36) reaches a predetermined value. The screw and nut system (68-70) is positioned between the mechanical control (48-50-60) and the control piston (80); in addition, the brake actuator (34) incorporates a device for resetting manually to zero (114), which is capable of acting upon the nut (70) of the screw and nut system (68-70) in order to reset the automatic adjustment device (66) to zero..
Japanese Patent JPS6174925 describes a device and method to control automatically the relative position of each member less expensively at the time of releasing the brake by fitting an automatic control elastic sealing material to the circumferential surfaces of a pressure plate and a piston. The circumferential surface of a pressure plate 10 pressing a disc 4 is so fitted as to be free to slide on the internal surface 11 of its housing, and a piston 12 pressing the said pressure plate 10 is so fitted as to be free to slide on a cylinder 15 installed continuously to a casing 14. Sealing grooves 17 and 16 are formed respectively on the circumferential surface of the pressure plate 10 and the internal surface of the cylinder 15, and fitted with elastic sealing materials 19 and 18 such as square ring type for both sealing and automatic adjustment purposes.
Therefore it is the need of the hour in the industry to develop a parking brake integrated annular piston brake with self adjusting mechanism for automotive application. This invention eventually addresses the above and proves to be performance efficient, cost effective and eases the assembly.
Further it will be apparent to those skilled in the art that the objects of this invention have been achieved by providing a parking brake integrated annular piston brake with self adjusting mechanism which is unique in nature unlike existing braking systems as described in the above prior art. Various changes may be made in and without departing from the concept of the invention. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing and modifying other methods and structures for carrying out the same purpose of the present invention. Further, features of some stages disclosed in this application may be employed with features of other stages. Therefore, the scope of the invention is to be determined by the terminology of the following claims and the legal equivalents thereof.
OBJECTIVES OF THE INVENTION
This invention may be summarized, at least in part, with reference to its objects.
The foremost object of the present invention is to present a parking brake integrated annular piston brake with self adjusting mechanism for automotive application.
Another object of the present invention is to provide a parking brake integrated self adjusting annular piston brake that is easy and simple to meet new regulations and customer requirements.
Another object of the present invention is to provide a parking brake integrated self adjusting annular piston brake to operate the brake during parking and in case of emergency.
Yet another object of the present invention is to provide a parking brake integrated self adjusting annular piston brake for a tractor brake that compensates for the wear of the friction material, without any manual external intervention.
A further object of the present invention is to provide a a parking brake integrated self adjusting annular piston brake concealment feature so that they are not exposed to water and slush in which these brakes sometimes operate.
Additional objects, advantages and novel features of the invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following, or may be learned by practice of the invention.
SUMMARY OF THE INVENTION
The present invention embodies a parking brake integrated annular piston brake with self adjusting mechanism for automotive application. The present invention contains a housing, an inner seal, an outer seal, a piston, an actuating disc, a washer, a plunger, a ball, three springs, a lever, a split pin, a guide pin, three friction discs, three intermediate discs, inlet pipe assembly and bleed pipe assembly.
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DESCRIPTION OF THE DRAWINGS
The advantages and features of the present invention will be more readily apparent by persons skilled in the art when considered in reference to the following description and when taken in conjunction with the accompanying drawings listed below
Figure 1 is a cross sectional view illustrating the present invention parking brake integrated annular piston brake with self adjusting mechanism.
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Figure 2 is a cross sectional view illustrating the present invention parking brake integrated annular piston brake with self adjusting mechanism as mounted onto the brake shaft.
DETAILED DESCRIPTION
The following description is presented to enable any person skilled in the art to make and use the invention, and is provided in the context of particular applications of the invention and their requirements. The present invention can be configured as follows:
The present invention is a parking brake integrated annular piston brake consisting of a self adjusting mechanism for more efficient braking process during pedal application and less wear and tear of parts.
Construction
As shown in Figure 1, the present parking brake integrated annular piston brake with self adjusting mechanism invention components are as follows:
1 Housing
2 Inner Seal
3 Outer Seal
4 Piston
5 Actuating Disc
6 Washer
7 Plunger
8 Ball
9 Spring (3)
10 Lever
11 Split Pin
12 Guide Pin
13 Friction Disc (3)
14 Intermediate Disc (3)
15. Inlet pipe assembly
16 Bleed Pipe Assembly
According to a preferred embodiment of the present invention, as depicted in Figure 1, the conventional oil immersed brake torque plate (alternatively called Housing (1)) is modified to house annular piston (4) with seal groove (as shown in FIG-1). These groove to assemble set of seals as inner brake seal (2) and outer brake seal (3).
According to a preferred embodiment of the present invention, as depicted in Figure 1, Friction discs (13) are assembled in between surface hardened intermediate discs (14). Friction discs have splines to mating with brake shaft (6) for rotation. Intermediate discs are stationary discs. When the brake is applied, fluid pressure inside housing (1) pushes the piston (4) against deflection of brake seals (2 and 3). Then Piston (4) pushes friction plates (13) and intermediate plates (14) to stop or slow the vehicle speed. If piston (4) travel is more than the deflection of seal (2 and 3), then piston (4) slides in between brake seals (2 and 3). When withdraw the fluid pressure in the housing (1), piston (4) comes to home position due to elastic effect of brake seals (2 and 3). This creates the desired clearance between friction (13) and intermediate discs (14).
According to a preferred embodiment of the present invention, as depicted in Figure 1, an inlet pipe assembly (15) is connected with housing to send pressurized fluid to annular piston brake. Bleed pipe assembly (16) is connected at other end of housing to bleed the system during filling the oil in the system.
According to a preferred embodiment of the present invention, as depicted in Figure 1, an integrated parking brake is provided in center of annular piston brake. This is mechanically actuated brake assembly for parking the vehicle and emergency braking too. A set of three hardened steel balls (8) housed inside of ball packet of actuation disc (5). A set of return springs (9) provided to pull back actuation disc (5) to home position. When parking brake is applied, a lever (10) connected with actuation disc (5) rotated and pushes the friction discs (13) and intermediate discs (14) to stop or slow the rotation of brake.
Working Principles
According to a preferred embodiment of the present invention, as depicted in Figure 2, when the brake pedal is pressed, the piston in the master cylinder moves and brake oil pressure is increased. This pressure is applied to the brake housing (1) through the connecting inlet pipe (16). The brake friction disc (13) rotating with the brake shaft (6) is pressed by piston (4) provided in the Annular Piston brake resulting brake application.
Automatic Brake adjustment:
According to a preferred embodiment of the present invention, as depicted in Figure 2, when brake is applied, pressure in the housing (1) rises, and the piston (4) in the Annular piston brake moves in forward direction to press the brake friction discs (13). At this time brake seals (2 and 3) fitted to the housing are subjected to elastic deflection. When Brake is released, pressure in the housing (1) reduces, due to which brake seals (2 and 3) tend to restore their original form. This force returns the piston (4) as much as the brake seals (2 and 3) have been deflected as a result of which it returns to its origin position. Accordingly, a clearance is maintained between the brake discs (13 and 14) and the brake piston (4) to prevent the brake dragging.
According to a preferred embodiment of the present invention, as depicted in Figure 2, worn brake discs (13) required longer brake piston (4) movement. When the brake piston (4) movement exceeds the elastic limit of brake seal (2 and 3), sliding occurs between the seals (2 and 3) and the brake piston (4), with the brake seals (2 and 3) kept deflected due to which the clearance is automatically kept constant.
Integrated Parking brake:
According to a preferred embodiment of the present invention, as depicted in Figure 1, a mechanical parking brake is provided in center of annular piston brake, which is independent of service brake. The lever (10) is provided to connect parking brake cable with hand brake lever at driver Cabin. A set of balls (8) is provided between actuator disc (5) and intermediate discs (14). These balls are located in the ramp cavities available in actuator disc (5).
According to a preferred embodiment of the present invention, as depicted in Figure 2, when hand brake lever (10) is applied, the actuator disc (5) provided in the parking brake cage is rotated and the ball (8) provided in the actuator ride over ramp cavities. As a result the brake friction discs (13) rotating with the brake shaft (6) is pressed by actuator provided the parking brake cage causing frictional forces. This frictional force provides braking effect.
While there has been shown and described what is considered to be preferred embodiments of the invention, it will, of course, be understood that various modifications and changes in form or detail could readily be made without departing from the spirit of the invention. It is therefore intended that the invention be not limited to the exact forms described and illustrated, but should be constructed to cover all modifications that may fall within the scope of the appended claims.
It will be apparent to those skilled in the art that the objects of this invention have been achieved by providing the above invention. However various changes may be made in the structure of the invention without departing from the concept of the invention. Therefore, the scope of the invention is to be determined by the terminology of the following claims and the legal equivalents thereof.
Dated this 29th day of July 2016
N. Surya Senthil – IN/PA-736
For JUS MAXIMA LAW OFFICES
(Agent for Applicant)
To :
The Controller of Patents
Patent Office in Chennai
Eregister
| Year | CBR Date | CBR Number | Renwal Amount | Renwal Date | Normal Due Date | Renwal To | Renwal From | Due Date with Extension | Reneal Certificate Number |
|---|---|---|---|---|---|---|---|---|---|
| 3rd year | 05/06/2023 | 25338 | 4000 | 05/06/2023 | 15/06/2023 | 01/08/2019 | 01/08/2018 | 15/12/2023 | 46837 |
| 4th year | 05/06/2023 | 25338 | 4000 | 05/06/2023 | 15/06/2023 | 01/08/2020 | 01/08/2019 | 15/12/2023 | 46838 |
| 5th year | 05/06/2023 | 25338 | 4000 | 05/06/2023 | 15/06/2023 | 01/08/2021 | 01/08/2020 | 15/12/2023 | 46839 |
| 6th year | 05/06/2023 | 25338 | 4000 | 05/06/2023 | 15/06/2023 | 01/08/2022 | 01/08/2021 | 15/12/2023 | 46840 |
| 7th year | 05/06/2023 | 25338 | 12000 | 05/06/2023 | 15/06/2023 | 01/08/2023 | 01/08/2022 | 15/12/2023 | 46841 |
| 8th year | 05/06/2023 | 25338 | 12000 | 05/06/2023 | 01/08/2023 | 01/08/2024 | 01/08/2023 | 01/02/2024 | 46842 |
| 9th year | 29/07/2024 | 48144 | 12000 | 29/07/2024 | 01/08/2024 | 01/08/2025 | 01/08/2024 | 01/02/2025 | 133616 |
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Specification
Documents
Orders
| Application Number | Applicant | Section | Controller | Decision Date | |
|---|---|---|---|---|---|
| 201641026224 |
Application Documents
| Name | Date | |
|---|---|---|
| 1 | 201641026224-IntimationOfGrant15-03-2023.pdf | 2023-03-15 |
| 2 | 201641026224-PatentCertificate15-03-2023.pdf | 2023-03-15 |
| 3 | 201641026224-Annexure [14-12-2022(online)].pdf | 2022-12-14 |
| 4 | 201641026224-Written submissions and relevant documents [14-12-2022(online)].pdf | 2022-12-14 |
| 5 | 201641026224-Correspondence to notify the Controller [28-11-2022(online)].pdf | 2022-11-28 |
| 6 | 201641026224-FORM 13 [16-11-2022(online)].pdf | 2022-11-16 |
| 7 | 201641026224-PETITION UNDER RULE 137 [16-11-2022(online)].pdf | 2022-11-16 |
| 8 | 201641026224-POA [16-11-2022(online)].pdf | 2022-11-16 |
| 9 | 201641026224-RELEVANT DOCUMENTS [16-11-2022(online)]-1.pdf | 2022-11-16 |
| 10 | 201641026224-RELEVANT DOCUMENTS [16-11-2022(online)].pdf | 2022-11-16 |
| 11 | 201641026224-US(14)-HearingNotice-(HearingDate-30-11-2022).pdf | 2022-10-10 |
| 12 | 201641026224-FER.pdf | 2021-10-17 |
| 13 | 201641026224-ABSTRACT [16-09-2021(online)].pdf | 2021-09-16 |
| 14 | 201641026224-CLAIMS [16-09-2021(online)].pdf | 2021-09-16 |
| 15 | 201641026224-COMPLETE SPECIFICATION [16-09-2021(online)].pdf | 2021-09-16 |
| 16 | 201641026224-DRAWING [16-09-2021(online)].pdf | 2021-09-16 |
| 17 | 201641026224-FER_SER_REPLY [16-09-2021(online)].pdf | 2021-09-16 |
| 18 | 201641026224-OTHERS [16-09-2021(online)].pdf | 2021-09-16 |
| 19 | 201641026224-FORM 18 [21-01-2020(online)].pdf | 2020-01-21 |
| 20 | Description(Complete) [01-08-2016(online)].pdf | 2016-08-01 |
| 21 | Drawing [01-08-2016(online)].pdf | 2016-08-01 |
| 22 | Form 3 [01-08-2016(online)].pdf | 2016-08-01 |
| 23 | Form 5 [01-08-2016(online)].pdf | 2016-08-01 |
| 24 | Power of Attorney [01-08-2016(online)].pdf | 2016-08-01 |
Search Strategy
| 1 | SearchStrategy201641026224E_25-01-2021.pdf |