GB2029532A - Disc brake - Google Patents

Disc brake Download PDF

Info

Publication number
GB2029532A
GB2029532A GB7927651A GB7927651A GB2029532A GB 2029532 A GB2029532 A GB 2029532A GB 7927651 A GB7927651 A GB 7927651A GB 7927651 A GB7927651 A GB 7927651A GB 2029532 A GB2029532 A GB 2029532A
Authority
GB
United Kingdom
Prior art keywords
disc
caliper
brake
pad spring
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
GB7927651A
Other versions
GB2029532B (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.)
Tokico Ltd
Original Assignee
Tokico 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 Tokico Ltd filed Critical Tokico Ltd
Publication of GB2029532A publication Critical patent/GB2029532A/en
Application granted granted Critical
Publication of GB2029532B publication Critical patent/GB2029532B/en
Expired legal-status Critical Current

Links

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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • F16D65/095—Pivots or supporting members therefor
    • F16D65/097—Resilient means interposed between pads and supporting members or other brake parts
    • F16D65/0973—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces
    • F16D65/0974—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on or in the vicinity of the pad rim in a direction substantially transverse to the brake disc axis
    • F16D65/0977—Springs made from sheet metal
    • 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
    • F16D2055/0041—Resilient elements interposed directly between the actuating member and the brake support, e.g. anti-rattle springs

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

In a disc brake for vehicles comprising a brake caliper 1 straddling a rotatable disc 4 and a pair of friction pads adapted to engage opposite faces of the disc, a pad spring 11 which straddles the disc for pressing the friction pads to prevent excessive play thereof, thermally insulates the brake caliper 1 from the disc 4 and preferably includes a layer of insulating material on the side adjacent the disc. <IMAGE>

Description

SPECIFICATION Disc brake This invention concerns disc brakes and, in particular, disc brakes of a heavy duty type for vehicles, or the like.
A disc brake is a device for braking the rotation of a disc, which is secured to a wheel shaft, by utilizing the frictional force generated between the disc and friction pads when the friction pads are pressed against the opposite surfaces of the disc. In braking the rotation of the disc, a heat is generated from the frictional force and, in severe conditions, the temperature of the disc will sometimes rise to about 400"C. The high temperature disc generates a radiation heat, whereby, a caliper which is disposed adjacent to the disc will receive the radiation heat and the temperature thereof will also rise. The caliper incorporates usually therein a hydraulic cylinder in which a piston works for pressing at least one of friction pads against the disc and, in applying the brake, oil under pressure is supplied into the cylinder.When the temperature of the caliper rises gas bubbles tend to generate in the oil under pressure thereby causing a vapor-lock phenomenon of deteriorating seal members, or decreasing the strength of the caliper.
It is an object of the invention to over come the problems aforementioned.
According to the present invention there is provided a disc brake in which a pad spring for pressing a friction pad has a dimension larger than the thickness of a disc, and said pad spring acts as a thermal barrier between the disc and a caliper.
According to a further aspect of the invention there is provided a disc brake comprising a brake caliper at least part of which straddles a rotatable disc, a pair of friction pads adapted to engage opposite faces of the disc hydraulic piston means for applying the friction pads to the disc and a pad spring straddling the disc and positioned between the caliper and the disc circumference, the pad spring having a width in the direction of the axis of rotation of the disc, greater than the thickness of the disc in the same direction, such that the pad spring acts as a thermal barrier between the disc and the portion of the caliper straddling the disc.
Preferably a heat insulating material is applied to the pad spring.
The invention will now be described further by way of example only with reference to the accompanying drawings, illustrating one embodiment of the invention, in which: Figure 1 is a front view of a disc brake according to the invention; Figure 2 is a sectional view taken along line Il-Il in Fig. 1; Figure 3 is a sectional view taken along line Ill-Ill in Fig. 1; and Figure 4 is a plan view of the pad spring according to the invention.
The disc brake shown in the drawings comprises a caliper which is slidably supported through pins 10 and 10 on a stationary member 9 which is secured to nonrotatable part of a vehicle. A cylinder 2 is formed in one of limbs 1 a of the caliper 1, and a piston 3 is slidably fitted in the cylinder 2 so as to move back and forth with respect to a disc 4.
In applying the brake, the piston 3 presses a friction pad 5 which is disposed on one side of the disc 4 against the disc 4, and another limb 1 b of the caliper 1 straddling the disc 4 presses another friction pad 6 against the disc 4. Interposed between the cylinder 2 and the piston 3 is a seal member 7 having a sealing function and a function retracting the piston 3 to its original position in releasing the brake.
A boot 8 seals the cylinder 2 from the outside.
A pad spring 11 according to the invention has, as shown in Fig. 4, a breadth W1 which is larger than the breadth W2 of the disc 4 so as to cover the upper side thereof and, also, the size sufficient to simultaneously press two friction pads 5 and 6. Further, the pad spring 11 extends in the direction of the circumference of the disc 4 with the length I thereof being sufficient to engage respectively with arms 9aand 9bof the stationary member 9.
Thus, the pad spring 11 is interposed between the stationary member 9 and the friction pads 5 and 6 and presses radially inwardly the friction pads 5 and 6 and, also, covers the upper side of the disc 4. The pad spring 11 is preferably formed of resilient material such as a spring steel and has heat insulating characteristics by applying such as melamin type or urethan type coating on the lower side surface thereof or by bonding a thin layer of synthetic resin or the like on the lower side surface.
The pad spring 11 has, as shown in Fig. 3, opposite ends 11 a and 11 b being respectively retained on arms 9a and 96 of the stationary member 9, projecting portions 11 cand 11 d for engaging with the friction pads 5 and 6, and projecting portions 11 e and 11 ffor resiliently engaging with the inside surface of the caliper 1, thereby, the pad spring 11 acts to prevent excessive play of the caliper 1 and frction pads 5 and 6 and to prevent vibrations or rattling noise.
Since the pad spring 11 covers the upper side of the disc 4 the radiation heat from the disc is reflected even when the disc 1 has been highly heated and, the caliper 1 will not receive such heat. The present invention is particularly adapted for use in a heavy duty type disc brake having the caliper formed of alminium.
An opening 11 g is formed in the central portion of the pad spring 11 and an opening 1 C is formed in the caliper 1 so that the wear of the friction pads 5 and 6 can visually be inspected through the openings 1 C and 11 C.
As described heretofore, according to the invention, a pad spring is utilized to intercept the heat from the disc, thus, the heat does not easily be transmitted to the caliper, thereby preventing the vapor-lock phenomenon and preventing the deterioration of seal members, further, preventing harmful influence of the heat on the caliper itself. The breadth of the pad spring is larger than that of the disc, thus it is possible to press two friction pads by a single sheet of pad spring thereby dereasing the number of parts. Further, desired heat insulating characteristics can easily be attained by applying heat insulating paint or the like or by attaching a heat insulating layer on the pad spring.

Claims (8)

1. A disc brake in which a pad spring for pressing a friction pad has a dimension larger than the thickness of a disc, and said pad spring acts as a thermal barrier between the disc and a caliper.
2. A disc brake for vehicles comprising a brake caliper at least part of which straddles á rotatable disc, a pair of fraction pads adapted to engage opposite faces of the disc, hydraulic piston means for applying the friction pads to the disc and a pad spring straddling the disc and positioned between the caliper and the disc circumference, the pad spring having a width, in the direction of the axis of rotation of the disc, greater than the thickness of the disc in the same direction, such that the pad spring acts as a thermal barrier between the disc and the portion of the caliper straddling the disc.
3. A disc brake as claimed in claim 1 or 2 in which a heat insulating material is applied to the pad spring.
4. A disc brake as claimed in claim 3 in which the heat insulating material is applied on the surface adjacent to the disc.
5. A disc brake as claimed in any of claims 1 to 4 in which an opening is formed in the pad spring for visually inspecting the wear of the friction pads therethrough.
6. A disc brake as claimed in any preceding claim in which the pad spring engages both pads and the brake caliper so as the bias the pads with respect to the caliper and prevent-noise and vibration.
7. A disc brake as claimed in any preceding claim in which the disc brake is a reaction brake and comprises a stationary member and a movable caliper member which passes over the periphery of the disc and the pad spring engages the stationary member, the caliper member and both friction pad, so as to bias the caliper member and the friction pads with respect to the stationary member of the brake caliper.
8. A disc brake constructed and arranged substantially as hereinbefore described with reference to the accompanying drawings.
GB7927651A 1978-08-09 1979-08-08 Disc brake Expired GB2029532B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10906878U JPS5526139U (en) 1978-08-09 1978-08-09

Publications (2)

Publication Number Publication Date
GB2029532A true GB2029532A (en) 1980-03-19
GB2029532B GB2029532B (en) 1982-07-14

Family

ID=14500776

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7927651A Expired GB2029532B (en) 1978-08-09 1979-08-08 Disc brake

Country Status (4)

Country Link
JP (1) JPS5526139U (en)
DE (1) DE2931840A1 (en)
FR (1) FR2433133A1 (en)
GB (1) GB2029532B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450940A (en) * 1980-04-18 1984-05-29 Valeo Brake with heat shield
US4512446A (en) * 1982-12-27 1985-04-23 Toyota Jidosha Kabushiki Kaisha Pin-sliding caliper disc brake with boot protector
DE3612355A1 (en) * 1986-04-12 1987-10-22 Teves Gmbh Alfred Anti-rattle spring for part-lining disc brakes, in particular for motor vehicles
WO1991008401A1 (en) * 1989-11-24 1991-06-13 Alfred Teves Gmbh Retainer spring for partly-coated disc brakes and appropriate housing and brake calipers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746572A1 (en) * 1997-10-22 1999-04-29 Itt Mfg Enterprises Inc Noise dampening arrangement for motor vehicle brakes

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB707013A (en) * 1952-01-05 1954-04-07 Girling Ltd Improvements in or relating to disc brakes for vehicles
GB1031946A (en) * 1963-08-29 1966-06-02 Heinz Teves Improvements in and relating to disc brakes
GB1384999A (en) * 1972-07-12 1975-02-26 Dba Sa Disc brake
GB1399855A (en) * 1973-01-13 1975-07-02 Daimler Benz Ag Spot type disc brakes
GB1477662A (en) * 1975-04-02 1977-06-22 Automotive Prod Co Ltd Disc brakes for motor vehicles
GB2003562A (en) * 1977-09-01 1979-03-14 Dba Sa A disc brake and a noise-reducing spring for such a brake
GB1545644A (en) * 1976-07-28 1979-05-10 Sumitomo Electric Industries Caliper disc brakes
GB2012894A (en) * 1978-01-20 1979-08-01 Girling Ltd Improvements in Disc Brakes for Vehicles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5222663A (en) * 1975-08-14 1977-02-21 Tokico Ltd Disc brake
GB1556532A (en) * 1977-01-08 1979-11-28 Automotive Prod Co Ltd Yoke for a disc brake

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB707013A (en) * 1952-01-05 1954-04-07 Girling Ltd Improvements in or relating to disc brakes for vehicles
GB1031946A (en) * 1963-08-29 1966-06-02 Heinz Teves Improvements in and relating to disc brakes
GB1384999A (en) * 1972-07-12 1975-02-26 Dba Sa Disc brake
GB1399855A (en) * 1973-01-13 1975-07-02 Daimler Benz Ag Spot type disc brakes
GB1477662A (en) * 1975-04-02 1977-06-22 Automotive Prod Co Ltd Disc brakes for motor vehicles
GB1545644A (en) * 1976-07-28 1979-05-10 Sumitomo Electric Industries Caliper disc brakes
GB2003562A (en) * 1977-09-01 1979-03-14 Dba Sa A disc brake and a noise-reducing spring for such a brake
GB2012894A (en) * 1978-01-20 1979-08-01 Girling Ltd Improvements in Disc Brakes for Vehicles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450940A (en) * 1980-04-18 1984-05-29 Valeo Brake with heat shield
US4512446A (en) * 1982-12-27 1985-04-23 Toyota Jidosha Kabushiki Kaisha Pin-sliding caliper disc brake with boot protector
DE3612355A1 (en) * 1986-04-12 1987-10-22 Teves Gmbh Alfred Anti-rattle spring for part-lining disc brakes, in particular for motor vehicles
WO1991008401A1 (en) * 1989-11-24 1991-06-13 Alfred Teves Gmbh Retainer spring for partly-coated disc brakes and appropriate housing and brake calipers

Also Published As

Publication number Publication date
FR2433133A1 (en) 1980-03-07
GB2029532B (en) 1982-07-14
FR2433133B1 (en) 1984-12-14
JPS5526139U (en) 1980-02-20
DE2931840A1 (en) 1980-02-28

Similar Documents

Publication Publication Date Title
US3388774A (en) Adjustable bearing means for a disc brake
US3378116A (en) Friction pad for disc brakes
US2963116A (en) Disc-brake
US4248329A (en) Disc brakes having an improved dust-proofing structure
US3416634A (en) Caliper-type disk brake and support means therefor
US3563347A (en) Disk brake with noise-limiting brakeshoe
JP4210333B2 (en) Disc brake
US4055238A (en) Anti-squeal device in disc brake
CA2866371C (en) Caliper brake apparatus
GB2184801A (en) Disc brakes
US3625316A (en) Antirattling device of disc brake
GB2088497A (en) Disc brake actuating apparatus
US3503475A (en) Vented disc brake friction pad and disc brake system employing same
GB2029532A (en) Disc brake
US4299311A (en) Disc brake
ES458487A1 (en) Disc brakes for vehicles
US4046232A (en) Disc brake sliding caliper assembly with brake pads of a common pattern, and method of construction
US3809190A (en) Disk type parking brake
US4019608A (en) Lever actuated caliper brake
JPS628653B2 (en)
GB2129511A (en) Shims for disc brake pads
US3780835A (en) Disc brakes for vehicles
US4305483A (en) Sliding caliper disc brake
GB2291684A (en) A disc brake asembly
GB2046855A (en) A disc brake for vehicles

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980808