GB2065248A - Improvements in sliding caliper disc brakes - Google Patents
Improvements in sliding caliper disc brakes Download PDFInfo
- Publication number
- GB2065248A GB2065248A GB8037019A GB8037019A GB2065248A GB 2065248 A GB2065248 A GB 2065248A GB 8037019 A GB8037019 A GB 8037019A GB 8037019 A GB8037019 A GB 8037019A GB 2065248 A GB2065248 A GB 2065248A
- Authority
- GB
- United Kingdom
- Prior art keywords
- caliper
- stationary member
- limb
- limb portion
- disc
- 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
Links
- 230000000694 effects Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes 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
- F16D55/22—Brakes 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
- F16D55/224—Brakes 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
- F16D55/225—Brakes 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
- F16D55/226—Brakes 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
- F16D55/2265—Brakes 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
- F16D55/227—Brakes 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0016—Brake calipers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0016—Brake calipers
- F16D2055/002—Brake calipers assembled from a plurality of parts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
A generally inverted U-shaped caliper (1) is slidably mounted on a stationary member (4), the caliper (1) having two limb portions (5, 9) and a bridge portion (14) connecting the two limb portions and in order to reduce deflection of the caliper member limb portion (9) there is provided a generally U-shaped guide rod (15) having two spaced parallel guide portions (16, 17) whose free ends are secured by screws 21, 22 to the one limb portion (5) of the caliper and a connecting portion (18) connecting the two guide portions (16, 17) and engaging with the outer surface of the other limb portion (9) of the caliper. The guide portions (16, 17) respectively pass slidably through respective bores (19, 20) in arm 4a of the stationary member (4) to support the caliper on the stationary member. The connecting portion (18) engages with recesses (23) in limb portion (9), and has outwardly curved portions (24, 25) to transmit uniform pressing force to limb portion (9). As shown, the braking torque in friction pads (8, 11) is directly transmitted to stationary member (4). In Figures 7, 8 the torque in pad (11) is transmitted via caliper (1) and guide rod (15) to stationary member (4) - pad (11) is secured to limb portion (9) by screw. <IMAGE>
Description
SPECIFICATION
Improvements in sliding caliper disc brakes
This invention relates to disc brakes and, particularly to disc brakes of the kind including a stationary member adapted to be secured to a non-rotatable part of a vehicle, first and second friction pads disposed on opposite sides of a rotatable disc, and a generally inverted U-shaped caliper slidably mounted on the stationary member with one limb portion thereof incorporating therein a brake actuator for applying the first friction pad against one surface of the disc, the other limb portion thereof engaging with the second friction pad, and a bridge portion connecting the two limb portions and extending over the circumference of the disc.
In conventional disc brakes of the kind set forth, the reaction force of the brake actuator in applying the brake is transmitted from the one limb portion to the other limb portion through the bridge portion, thus, there is a problem that the other limb portion deforms outwardly with respect to the one limb portion due to the bending force acting through the bridge portion, thereby decreasing the braking effects, causing uneven wear of the friction pads, and generating the socalled fading phenomenon or the like.
Although the problem can be solved by increasing the thickness of the bridge portion so as to increase the rigidity of the caliper, it is not advantageous to increase the thickness of the bridge portion because firstly, of the restricted mounting space, and secondly because this would increase the weight of the disc brake.
An object of the invention is to solve the problem aforementioned in disc brakes of the kind set forth.
According to the invention there is provided a disc brake comprising a stationary member secured to a non-rotatable part of a vehicle, first and second friction pads disposed on opposite sides of a rotatable disc, and a generally inverted
U-shaped caliper slidably mounted on the stationary member with one limb portion thereof incorporating therein a brake actuator for applying the first friction pad against one surface of the disc, the other limb portion thereof engaging with the second friction pad and a bridge portion connecting the two limb portions and extending over the circumference of the disc, wherein a generally U-shaped guide rod having two spaced parallel guide portions inter-connected by a connecting portion is provided on the caliper, with the free ends of the guide portions being secured to the one limb portion of the caliper, and the connecting portion thereof engaging with the outer surface of the other limb portion of the caliper, and the respective guide portions slidably pass through respective bores in the stationary member thereby supporting the caliper on the stationary member.
The present invention will now be described further, by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a partially broken plan view of a typical prior art disc brake;
Fig. 2 is a longitudinal section taken along line Il-Il in Fig. 1;
Fig. 3 is a plan view of a disc brake according to the invention;
Fig. 4 is a front view of the disc brake of Fig. 3.
Fig. 5 is a longitudinal section taken along line V-V in Fig. 3;
Fig. 6 is a sectional view taken generally along line VI--VI in Fig. 3;
Fig. 7 is a view similar to Fig. 3 but showing a second embodiment of the invention, and
Fig. 8 is a view similar to Fig. 5 but showing the second embodiment.
A prior art disc brake illustrated in Figs. 1 and 2 comprises a stationary member 4 adapted to be secured to a non-rotatable part (not shown) of a vehicle, a first friction pad 8 having a backing plate 7, a second friction pad 11 having a backing plate 10, and a generally inverted U-shaped (as seen in
Fig. 2) caliper 1 having one limb portion 5, the other limb portion 9 and a bridge portion 14. The bridge portion 14 integrally connects the limb portions 5 and 9 and extends over the circumference of a rotatable disc 1 3. The caliper 1 is slidably supported on the stationary member 4 by guide pins 2 and 3.A brake actuator such as a hydrauiic cylinder and piston device including a piston 6 is incorporated in the one limb portion 5 of the caliper 1, and the piston 6 displaces in the arrow A direction when pressurized liquid is supplied from a master cylinder (not shown) to the brake actuator. The stationary member 4 has two spaced arms 4a which straddle respectively the circumference of the disc 1 3 to extend from one side of the disc 1 3 to the other side. The friction pads 8 and 11 are supported on the arms 4a of the stationary member 4 and can displace in the direction of the axis of the disc 1 3 in applying the brake. A seal 12 formed of such as synthetic resin seals the piston 6.
In operation, pressurized liquid supplied to the brake actuator displaces the piston 6 in the arrow
A direction to press the friction pad 8 against one surface of the disc 13, and the reaction force generating in the brake actuator displaces the caliper 1 in the arrow B direction and the limb portion 9 of the caliper 1 presses the friction pad 11 against the other surface of the disc 13. The reaction force is transmitted from the one limb portion 5 to the other limb portion 9 through the bridge portion 14, thus, particularly when the brake applying force is large, the limb portion 9 tends to deform outwardly or in the arrow C direction with respect to the limb portion 5.The ineffective stroke of the piston 6 will increase, the friction pads will wear unevenly since the friction pad 11 will incline with respect to the friction pad 8, and the braking effects will decrease.
Figs. 3-6 illustrate a first embodiment of the present invention, which is generally similar to the disc brake shown in Figs. 1 and 2, thus, corresponding numerals have been applied to corresponding parts, and the description therefor is partly omitted.
In the embodiment, the guide pins 2 and 3 in
Fig. 1 are substituted by a generally U-shaped guide rod 15. The guide rod 15 has two spaced parallel guide portions 16 and 17, and a connecting portion 18 connecting one each of each guide portion 16 and 17. The guide portions 16 and 17 pass slidably through respective bores 19 and 20 formed through arms 4a and 4a of the stationary member 1, and the free ends of the guide portions 16 and 17 are secured to circumferentially projecting lugs 5a and 5a of the limb portion 5 of the caliper 1 by screws 21 and 22 respectively. The connecting portion 18 tightly engages with recesses 23 formed in the outer surface of the limb portion 9 of the caliper 1.The reaction force acting on the limb portion 5 in applying the brake is partly transmitted to the limb portion 9 through the guide rod 15, thus, the deformation of the limb portion 9 in the arrow C direction can be controlled, and the weight of the bridge portion 14 of the caliper 1 can be decreased. There are provided dust boots 28 between the bore 19 and 20 of the stationary member 4 and the guide portions 16 and 17 of the guide rod 15. Further, the connecting portion 18 has outwardly curved portions 24 and 25 as clearly seen in Fig. 3 so as to transmit uniform pressing force to the limb portion 9. Shown at 26 in Figs. 3 and 4 are lugs formed on the bridge portion 14 of the caliper 1 to locate the guide portions 16 and 17 of the guide rod 15.
Figs. 7 and 8 illustrate a second embodiment of the invention, wherein the friction pad 11 is secured to a mounting wall 9a of the limb portion 9 by screws 30, and the stationary member 4 is modified to have circumferentially spaced arms 4b and 4b which support slidably the friction pad 8 and do not straddle the circumference of the disc
13. The second embodiment differs from the first embodiment in that the braking torque generated in the friction pads 8 and 11 is directly transmitted to the stationary member 4 in the first embodiment, but, in the second embodiment, the braking torque generated in the friction pad 11 is transmitted through the caliper 1 and through the guiding rod 1 5 to the stationary member. But the function and the effects of the guiding rod 1 5 described with reference to the first embodiment are applicable to the second embodiment.
As described heretofore, the guiding rod according to the invention acts to slidably support the caliper on the stationary member and also acts to reinforce the caliper so as to prevent the outward deformation of the generally inverted Ushaped caliper. The construction is simple and it is possible to decrease the cost and the weight of the disc brake without sacrificing the strength of the caliper.
Claims (4)
1. A disc brake comprising a stationary member secured to a non-rotatable part of a vehicle, first and second friction pads disposed on opposite sides of a rotatable disc, and a generally inverted
U-shaped caliper slidably mounted on the stationary member with one limb portion thereof incorporating therein a brake actuator for applying the first friction pad against one surface of the disc, the other limb portion thereof engaging with the second friction pad and a bridge portion connecting the two limb portions and extending over the circumference of the disc, wherein a generally U-shaped guide rod having two spaced parallel guide portions interconnected by a connecting portion is provided on the caliper, with the free ends of the guide portions being secured to the one limb portion of the caliper, and the connecting portion thereof engaging with the outer surface of the other limb portion of the caliper, and the respective guide portions slidably pass through respective bores in the stationary member thereby supporting the caliper on the stationary member.
2. A disc brake as claimed in claim 1 wherein the friction pads are slidably supported on the stationary member
3. A disc brake as ciaimed in claim 1 wherein the second friction pad is secured to the other limb portion of the caliper.
4. A disc brake constructed and arranged and adapted to operate substantially as hereinbefore described with reference to and as illustrated in
Figs. 3 to 8 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979160717U JPS5681229U (en) | 1979-11-20 | 1979-11-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2065248A true GB2065248A (en) | 1981-06-24 |
| GB2065248B GB2065248B (en) | 1983-11-30 |
Family
ID=15720941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8037019A Expired GB2065248B (en) | 1979-11-20 | 1980-11-19 | Sliding caliper disc brakes |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5681229U (en) |
| DE (1) | DE3043793A1 (en) |
| FR (1) | FR2470292A1 (en) |
| GB (1) | GB2065248B (en) |
| IT (2) | IT1134361B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2501318A1 (en) * | 1981-03-09 | 1982-09-10 | Sumitomo Electric Industries | DISC BRAKE FOR MOTOR VEHICLES |
| DE3141599A1 (en) * | 1981-03-05 | 1982-09-23 | Alfred Teves Gmbh, 6000 Frankfurt | Spot-type floating calliper disc brake |
| EP0119888A1 (en) * | 1983-02-22 | 1984-09-26 | Allied Corporation | A disc brake |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1195113B (en) * | 1986-08-01 | 1988-10-12 | Weber Spa | DISC BRAKE CALIPER FOR VEHICLES |
| DE4208132A1 (en) * | 1991-03-15 | 1992-09-17 | Honda Motor Co Ltd | Brake saddle assembly - has main part, piston and brake lining and has reactive part, saddle-holder and slide pins |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1020452A (en) * | 1962-05-03 | 1966-02-16 | Girling Ltd | Improvements in disc brakes |
| US3245500A (en) * | 1963-02-12 | 1966-04-12 | Girling Ltd | Spot type disc brakes |
| GB1250888A (en) * | 1967-12-14 | 1971-10-20 | ||
| FR2001636A1 (en) * | 1968-02-09 | 1969-09-26 | Sumitono Electric Ind | |
| GB1375697A (en) * | 1970-12-22 | 1974-11-27 |
-
1979
- 1979-11-20 JP JP1979160717U patent/JPS5681229U/ja active Pending
-
1980
- 1980-11-19 GB GB8037019A patent/GB2065248B/en not_active Expired
- 1980-11-19 FR FR8024547A patent/FR2470292A1/en active Granted
- 1980-11-19 IT IT8026097A patent/IT1134361B/en active
- 1980-11-19 IT IT8023438U patent/IT8023438V0/en unknown
- 1980-11-20 DE DE19803043793 patent/DE3043793A1/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3141599A1 (en) * | 1981-03-05 | 1982-09-23 | Alfred Teves Gmbh, 6000 Frankfurt | Spot-type floating calliper disc brake |
| FR2501318A1 (en) * | 1981-03-09 | 1982-09-10 | Sumitomo Electric Industries | DISC BRAKE FOR MOTOR VEHICLES |
| EP0119888A1 (en) * | 1983-02-22 | 1984-09-26 | Allied Corporation | A disc brake |
| US4540068A (en) * | 1983-02-22 | 1985-09-10 | Allied Corporation | Disc brake |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2470292A1 (en) | 1981-05-29 |
| IT8026097A0 (en) | 1980-11-19 |
| JPS5681229U (en) | 1981-07-01 |
| GB2065248B (en) | 1983-11-30 |
| FR2470292B1 (en) | 1982-12-10 |
| DE3043793A1 (en) | 1981-06-19 |
| IT1134361B (en) | 1986-08-13 |
| IT8023438V0 (en) | 1980-11-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |