GB2069078A - A disc brake - Google Patents

A disc brake Download PDF

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Publication number
GB2069078A
GB2069078A GB8104466A GB8104466A GB2069078A GB 2069078 A GB2069078 A GB 2069078A GB 8104466 A GB8104466 A GB 8104466A GB 8104466 A GB8104466 A GB 8104466A GB 2069078 A GB2069078 A GB 2069078A
Authority
GB
United Kingdom
Prior art keywords
disc
caliper
slide pin
pad
friction pad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8104466A
Other versions
GB2069078B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akebono Brake Industry Co Ltd
Original Assignee
Akebono Brake Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akebono Brake Industry Co Ltd filed Critical Akebono Brake Industry Co Ltd
Publication of GB2069078A publication Critical patent/GB2069078A/en
Application granted granted Critical
Publication of GB2069078B publication Critical patent/GB2069078B/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00Parts or details
    • F16D65/02Braking members; Mounting thereof
    • F16D65/04Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095Pivots or supporting members therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/227Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing by two or more pins
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00Parts or details
    • F16D65/02Braking members; Mounting thereof
    • F16D65/04Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095Pivots or supporting members therefor
    • F16D65/097Resilient means interposed between pads and supporting members or other brake parts
    • F16D65/0972Resilient means interposed between pads and supporting members or other brake parts transmitting brake reaction force, e.g. elements interposed between torque support plate and pad
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004Parts or details of disc brakes
    • F16D2055/0045Braking members arranged non-symmetrically with respect to the brake disc
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00Parts or details
    • F16D65/02Braking members; Mounting thereof
    • F16D2065/026Braking members; Mounting thereof characterised by a particular outline shape of the braking member, e.g. footprint of friction lining

Abstract

A disc brake has carrying mechanisms 10a, 10b slidably mounting a caliper 5 the mechanisms respectively comprising pins 11, 16 secured to arm parts 3a, 3b of a fixed support 2, arm part 3a being extended to project over the outer periphery of the disc 1. Slide pin 16 has an extended part 16b which also projects over the disc. The friction pad 23 is slidably carried by guiding part 4 of the arm part 3a and by the extended part 16b, pad 20 is guided by arm parts 3a, 3b by means of grooves. Clearance t exists between pad 23 and part 16b, so brake torque for normal rotation of the disc is taken by arm part 3a for pad 23, but by arm part 3b for pad 20. It is also stated that the brake torque may be arranged to be distributed between the two arm parts irrespective of direction of disc rotation. <IMAGE>

Description

SPECIFICATION A disc brake This invention relates to a disc brake, and in particular but not exclusively to a disc brake intended for use on a motor vehicle, for braking a road wheel thereof.
It is most desirable that the component parts of a motor vehicle should be designed to weigh as little as possible, to improve the energy efficiency of the vehicle, and in the case of a brake assembly, it is also desirable to reduce the unsprung weight as much as possible. Apart from these requirements for light brake components, in the case of a sliding caliper disc brake where the caliper may slide in the axial direction of the disc on brake application to urge the pads into engagement with the disc, it is very important that the caliper may slide smoothly.To meet these requirements, there have been various proposals for disc brakes which are equipped with pin-type slide mechanisms, and to achieve a reduction in weight, a support for the pin-type mechanisms has been provided by a part of a hub assembly formed integrally therewith, the shaft for the road wheel and brake disc extending through and journalled within the hub assembly.
The invention aims at further improving a disc brake assembly in an attempt better to meet the abovementioned requirements.
Accordingly, this invention provides a disc brake comprising a rotatable brake disc, a fixed support disposed adjacent one face of the disc and having a pair of arm parts extending in a fork-like manner generally radially of the disc, one of the arm parts providing a guiding part which extends over the outer periphery of the disc to project beyond the other face of the disc, first and second slide pins secured one to each arm part respectively to extend parallel to the disc axis, the second slide pin having a first extension part extending in a direction away from the disc and a second extension part extending over the outer periphery of the disc to project beyond the other face of the disc, a pair of friction pads disposed one to each side of the disc, the friction pad adjacent the one face being slidably carried by the pair of arm parts and the other friction pad being slidably carried by the guiding part and the second extension part of the second slide pin, and a caliper slidably mounted on the first slide pin and the first extension part of the second slide pin, the caliper embracing the pair of friction pads so as to be capable of urging the pads against the respective faces of the disc.
It will be appreciated that the disc brake of this invention has a relatively simple construction which lends itself to a reduction in the overall weight of the brake assembly, and is arranged to have a caliper and friction pads all of which may slide in the axial direction of the disc when the brake is applied, notwithstanding any deformation of the support which usually takes place to some extent during brake application.
Preferably, the guiding part is formed integrally with said one arm part, by arranging the one arm part to be extended and bent over to lie generally parallel to the disc axis. Such an arrangement lends itself to the production of a support by punching from sheet metal, with economic use of the material.
Advantageously, said other friction pad has an aperture which is provided adjacent one end thereof and into which aperture the guiding part projects with virtually no play therebetween, said other friction pad also having a groove part at the other end thereof in which is engaged the second extension part of the second slide pin with virtually no play in the radial direction of the disc but with some clearance in the circumferential direction of the disc. Particularly for the case where the support is made from sheet material, the aperture in the other friction pad may be of approximately rectangular shape to receive a similarly-formed guiding part, but the groove part may be of substantially semi-circular shape, to receive the second extension part of the second guide pin.
To allow the caliper freely to slide, the caliper preferably has a pair of legs in each of which there is a bore into which the respective slide pin projects, there being an elastic bush between the first slide pin and the associated bore, and the other bore fitting around the first extension part of the second slide pin with virtually no clearance therebetween.
Preferably, the first slide pin is disposed on the leading side of the caliper, having regard to the relative rotation between the disc and caliper on normal service of the disc brake - that is to say, in the case of the brake fitted to a motor vehicle, on the rearward side of the caliper.
By way of example only, one specific embodiment of disc brake constructed in accordance with this invention will now be described, reference being made to the accompanying drawings, in which: Figure 1 is a partly-sectional plan view of the brake assembly; Figure 2 is a side view of the assembly of Figure 1; Figure 3 is a view from the other side of the assembly; and Figure 4 is a transverse sectional view of the brake assembly.
In the embodiment of vehicle disc brake shown in the accompanying drawings, there are provided a disc 1 and a support 2. The support 2 either is formed integrally with a hub assembly (not shown) through which a shaft extends to support the disc 1 and a wheel, or is formed separately from the hub assembly but is secured thereto with bolts.
The support 2 is provided with a pair of arm parts 3a and 3b which extend from the support in a fork-like manner in the radial direction of the disc 1, parallel to a face thereof. These arm parts 3a and 3b are thus disposed adjacent the peripheral region of the disc 1, on the inner side thereof (having regard to the mounting of the brake on a vehicle). A friction pad guiding part 4 is formed integrally with the arm part 3a and extends over the periphery of the disc to lie on the outer side of the disc 1.
The disc brake has a caliper 5 which straddles a peripheral part of the disc 1 and is slidably carried by first and second carrying mechanisms 1 Oa and 1 Ob, so as to be slidable in the axial direction of the disc 1. The caliper 5 is provided with a cylinder 8 which is formed in a boss part 6 of the caliper 5 and which has a friction pad thrusting piston 7 disposed therein. The caliper 5 has a reaction part 9, formed on the opposite side of the disc 1 to the boss part 6.
The first carrying mechanism 1 0a has a sleevelike slide pin 11 secured to the arm part 3a of the support 2 by a bolt 12. A leg part of the caliper 5 has an opening 1 3a in which is located a rubber bush 14, slidably carried on the slide pin 11. The caliper 5 is thus slidably carried by this mechanism. The rubber bush 14 is provided with boot parts 1 5 which extend from both ends of the rubber bush 14 to the ends of the slide pin 11, to seal off the sliding faces so as to protect them from the external environment, the ends of the boot parts 15 tightly engaging the slide pin 11.
The second carrying mechanism 1 0b includes a slide pin 1 6 the central part of which is screwed into a threaded bore in arm part 3b of the support.
The pin 1 6 has a first extension part 1 6a which extends in the direction away from the disc 1 and which is engaged by an opening in another leg part 1 3b of the caliper 5, without any play therebetween, so as slidably to carry the caliper 5.
A boot 17 and a cap 18 serve to seal off the sliding faces of the extension part 1 6a and the leg part 13b. The slide pin 16 also has a second extension part 1 6b formed integrally therewith, and which is arranged to extend over the periphery of the disc to project beyond the other face thereof.
On the inner side of the disc 1 , there is provided a friction pad 20, provided with protruding parts 20a and 20b at the two ends thereof. The protruding parts 20a and 20b engage grooves 22a and 22b formed in the arm parts 3a and 3b of the support, so that the friction pad 20 is carried by the support and is able to slide in the axial direction of the disc 1. Thus disposed, the friction pad 20 may be pushed against the disc 1 by the pad thrusting piston 7. The arm parts 3a and 3b of the support are provided with pad clips 21 a and 21 b which are positioned within the grooves 22a and 22b of the arm parts 3a and 3b, to form sliding support faces.
On the outer side of the disc 1 , there is provided another friction pad 23. The two ends of the outer friction pad 23 are slidably carried by a friction pad guiding part 4 of the arm part 3a of the support 2 and by the second extension part 1 6b of the slide pin 1 6. Thus disposed, the outer friction pad 23 is also able to slide in the axial direction of the disc 1. The reaction part 9 of the caliper 5 serves to push the outer friction pad 23 against the disc 1 on operation of the piston 7 to push pad 20 into engagement with the disc.
The relation between the outer friction pad 23, the guiding part 4 and the second extension part 1 6b of the slide pin 16 will now be described.
Referring now to Figure 3, during a forward movement of the vehicle, the disc 1 rotates in the direction shown by the arrow in the drawing. On the rearward side of the caliper, considering the disc rotation, guiding part 4 is provided, and this has an approximately rectangular sectional shape, fitting closely in a slot 24 provided in one end of the friction pad 23. On the forward side of the caliper (having regard to disc rotation) the second extension part 1 6b of circular sectional shape is engaged in a semi-circular groove 25 provided in the other end of the friction pad 23, there being no play in the radial direction of the disc 1 but with a clearance t in the circumferential direction of the disc 1.Such being the arrangement, brake torque developed by the outer friction pad 23 is taken by the friction pad guiding part 4 extending from the support arm part 3a, irrespective of the direction in which the disc rotates: virtually no brake torque is applied to the slide pin 1 6.
During a forward movement of the vehicle, brake torque developed at the inner friction pad 20 is taken by the support arm part 3b which is disposed on the forward side of the caliper (having regard to disc rotation) while the brake torque developed at the outer friction pad is taken by the support arm part 3a which is disposed on the rearward side of the caliper. The brake torque is thus divided and taken by the first and second support arm parts 3a and 3b. Besides, since the brake torque developed at the inner friction pad 20 is arranged to be taken directly by the support arm part 3b, the second extension part 1 6b of the slide pin 16 can be allowed to have a smaller diameter. Also, a greater moment resulting from the brake torque developed at the outer friction pad 23 can be taken by the support arm part 4, which is relatively strong.No brake torque is thus applied to the slide pin 1 6. Therefore, since the slide pin 16 is not caused to bend by brake torque, the caliper 5 can correctly be guided in the axial direction of the disc 1. This prevents the possibility of the caliper 5 coming out of alignment during brake application, so that uneven wear of the friction pads can be prevented.
Where the support is to be made from sheet metal, for example, the arrangement described in the foregoing gives the advantage that the number of supports which can be made from a given area of metal can be increased, as compared to known supports. This is because disc brake assemblies are known with supports having friction pad guiding parts on the outer side of the disc formed by bending extensions to the support to provide both of the guiding parts. The shape of the support does not therefore lend itself to multiple punching of blanks from a long strip of the sheet metal. By contrast, in the case of the described embodiment, one support can be punched out with the next support punched out the opposite way round, because, on the outer side of the disc, it is only a one arm part that is to be bent to extend over the disc. Supports for this embodiment thus permit the effective use of material.
The invention is of course not limited to the specific construction of the embodiment described above. For example, the brake torque may be arranged always to be distributed between the two arm parts of the support, irrespective of whether the vehicle is moving forward or backward.
The described embodiment is however highly advantageous for its simple structure and low weight. There are thus advantages in the practical realisation of the disc brake.

Claims (8)

1. A disc brake comprising a rotatable brake disc, a fixed support disposed adjacent one face of the disc and having a pair of arm parts extending in a fork-like manner generally radially of the disc, one of the arm parts providing a guiding part which extends over the outer periphery of the disc to project beyond the other face of the disc, first and second slide pins secured one to each arm part respectively to extend parallel to the disc axis, the second slide pin having a first extension part extending in a direction away from the disc and a second extension part extending over the outer periphery of the disc to project beyond the other face of the disc, a pair of friction pads disposed one to each side of the disc, the friction pad adjacent the one face being slidably carried by the pair of arm parts and the other friction pad being slidably carried by the guiding part and the second extension part of the second slide pin, and a caliper slidably mounted on the first slide pin and the first extension part of the second slide pin, the caliper embracing the pair of friction pads so as to be capable of urging the pads against the respective faces of the disc.
2. A disc brake according to claim 1, wherein the guiding part is formed integrally with said one arm part.
3. A disc brake according to claim 1 or claim 2, wherein said other friction pad has an aperture which is provided adjacent one end thereof and into which aperture the guiding part'projects with virtually no play therebetween, said other friction pad also having a groove part at the other end thereof in which is engaged the second extension part of the second slide pin with virtually no play in the radial direction of the disc but with some clearance in the circumferential direction of the disc.
4. A disc brake according to claim 3, wherein the aperture in said other friction pad is of approximately rectangular shape, and the groove part is of substantially semi-circular shape.
5. A disc brake according to any of the preceding claims, wherein the caliper is provided with a pair of bores into which the slide pins project, there being an elastic bush between the first slide pin and the associated bore, and the other bore fitting around the first extension part of the second slide pin with virtually no clearance therebetween.
6. A disc brake according to any of the preceding claims, wherein the first slide pin is disposed on the leading side of the caliper, having regard to the relative rotation between the disc and caliper in normal service of the disc brake.
7. A disc brake according to any of the preceding claims, wherein the caliper has a single piston for urging one of the pads into engagement with the disc and a reaction part engaged with the other pad to urge that pad into engagement with the disc on sliding movement of the caliper reacting to movement of the piston.
8. A disc brake substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8104466A 1980-02-12 1981-02-12 Disc brake Expired GB2069078B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1575880A JPS56113839A (en) 1980-02-12 1980-02-12 Disk brake

Publications (2)

Publication Number Publication Date
GB2069078A true GB2069078A (en) 1981-08-19
GB2069078B GB2069078B (en) 1983-06-08

Family

ID=11897675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8104466A Expired GB2069078B (en) 1980-02-12 1981-02-12 Disc brake

Country Status (4)

Country Link
JP (1) JPS56113839A (en)
AU (1) AU527603B2 (en)
DE (1) DE3104863C2 (en)
GB (1) GB2069078B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096498A1 (en) * 1982-06-09 1983-12-21 Automotive Products Public Limited Company A disc brake and disc brake pad
EP0697536B1 (en) * 1994-08-18 2002-11-06 Akebono Brake Industry Co., Ltd. Disc brake caliper support
WO2017036802A1 (en) * 2015-08-31 2017-03-09 Continental Teves Ag & Co. Ohg Backing plate for a disk brake lining, disk brake lining, and fixed-caliper disk brake therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856229U (en) * 1981-10-12 1983-04-16 アイシン精機株式会社 Caliper type disc brake
DE3413737A1 (en) * 1984-04-12 1985-10-17 Alfred Teves Gmbh, 6000 Frankfurt Spot-type disc brake
DE4236684A1 (en) * 1992-10-30 1994-05-05 Teves Gmbh Alfred Lightweight disc brake in modular construction - has two parts of support frame linked by spacer bolts which locate the brake pads.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131337B1 (en) * 1969-03-26 1976-09-06
GB1361994A (en) * 1971-06-22 1974-07-30 Girling Ltd Disc brakes
JPS5168986U (en) * 1974-11-27 1976-05-31
FR2329900A1 (en) * 1975-10-31 1977-05-27 Akebono Brake Ind FLOATING CALIPER TYPE DISC BRAKE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096498A1 (en) * 1982-06-09 1983-12-21 Automotive Products Public Limited Company A disc brake and disc brake pad
GB2121493A (en) * 1982-06-09 1983-12-21 Automotive Products Plc Disc brake
EP0697536B1 (en) * 1994-08-18 2002-11-06 Akebono Brake Industry Co., Ltd. Disc brake caliper support
WO2017036802A1 (en) * 2015-08-31 2017-03-09 Continental Teves Ag & Co. Ohg Backing plate for a disk brake lining, disk brake lining, and fixed-caliper disk brake therefor
CN107850147A (en) * 2015-08-31 2018-03-27 大陆-特韦斯股份有限公司 For the backboard of gasket for disc brake, gasket for disc brake and its fixing card jaw type disk brake
CN107850147B (en) * 2015-08-31 2020-01-17 大陆-特韦斯股份有限公司 Disc brake lining, backing plate thereof and fixed caliper disc brake
US10670093B2 (en) 2015-08-31 2020-06-02 Continental Teves Ag & Co. Ohg Backing plate for a disk brake lining, disk brake lining, and fixed-caliper disk brake therefor

Also Published As

Publication number Publication date
JPS6349094B2 (en) 1988-10-03
JPS56113839A (en) 1981-09-08
DE3104863A1 (en) 1981-12-10
AU6669881A (en) 1981-08-20
GB2069078B (en) 1983-06-08
DE3104863C2 (en) 1985-01-17
AU527603B2 (en) 1983-03-10

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PCNP Patent ceased through non-payment of renewal fee