GB1597778A - Spot-type discbrake - Google Patents

Spot-type discbrake Download PDF

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Publication number
GB1597778A
GB1597778A GB1947578A GB1947578A GB1597778A GB 1597778 A GB1597778 A GB 1597778A GB 1947578 A GB1947578 A GB 1947578A GB 1947578 A GB1947578 A GB 1947578A GB 1597778 A GB1597778 A GB 1597778A
Authority
GB
United Kingdom
Prior art keywords
sleeve
bore
stationary member
pin
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.)
Expired
Application number
GB1947578A
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 GB1597778A publication Critical patent/GB1597778A/en
Expired legal-status Critical Current

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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
    • F16D55/22655—Constructional details of guide 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
    • 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

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

Description

(54) SPOT-TYPE DISC-BRAKE (71) We, TOKICO LTD., a Japanese body corporate of 6-3, Fujimi 1-Chome, Kawasaki-ku, Kawasaki-shi, Kanagawa-ken, Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a spot-type disc brake.
In particular the present invention relates to a spot-type disc brake of the kind in which an inner or directly actuated friction pad located on one side of a rotatable disc by an actuator, and an outer or indirectly actuated friction pad is pressed against the other side of the disc through a caliper which straddles a minor portion of the periphery of the disc and is slidably supported on the stationary member.
In one prior art disc brake of the aforementioned kind, the caliper has a pair of parallel pins which are spaced from each other in the direction of the circumference of the disc and extending in the direction of the axis of the disc, and which are slidably received in guide bores formed in the stationary member.
Usually, the stationary member has been formed of a casting, and the guide bores have been formed by drilling the casting and finishing the inner surfaces of the bores by grinding or the like. However, since the guide bore is usually a blind bore rather than a through bore, there is drawbacks such that it is difficult to properly remove chips formed in machining operation and, accordingly, to obtain desired accuracy in finishing the inner surface of the bore, whereby sliding resistance of the pin or the machining costs of the stationary member will increase.
Further, the disc brake of the kind usually includes a boot for preventing ingress of water or dusts from sliding portion between the guide bore and the pin. One end of the boot Is usually retained on the stationary member by means an annular groove formed around the open end of the bore and an annular cap member or a ring forcibly fitted in the groove, but it has been difficult to assure good sealingness.
The aim of the present invention is to provide a spot-type disc brake of the afore mentioned kind which solves the previous drawbacks outlined hereabove.
According to the present invention there is provided a spot-type disc brake including a stationary member adapted to be secured to a non-rotatable part of a vehicle, a caliper member adapted to straddle a minor portion of the periphery of a rotatable disc, and means slidably supporting said caliper member on said stationary member; said means comprising at least one pin secured to one of said members and extending in a direction parallel to the disc axis, a bore formed in the other of said members, and a rigid cylindrical sleeve or liner fixedly received in the bore and slidably receiving said pin.
The sleeve may forcibly be fitted in the guide bore formed in the stationary member with low accuracy but, alternatively, a sleeve formed of steel pipe or the like may be provided in the stationary member by an integral casting process. The inner surface of the sleeve can be finished separately from forming or machining process of the stationary member, it is possible to reduce production costs of the disc brake.
The invention will now be further described, by way of example, with reference to the accompanying drawings in which: Fig. 1 is a plan view of a preferred embodiment of a disc brake according to the present invention; Fig. 2 is an elevational view of the disc brake of Fig. 1; Fig. 3 is a side view of the disc brake of Fig. 1; Fig. 4 is an enlarged cross-sectional view taken along line IV-IV in Fig. 1; and Fig. 5 is a cross-sectional view similar to Fig. 4 but showing another embodiment of the present invention.
In the disc brake illustrated in Figs. 1 to 4 inclusive, a generally U-shaped stationary member 1 having a pair of arms A and B on the opposite sides thereof is adapted to be secured by two bolts (not shown) engaging with screw-threaded holes 1C and 1D to a nonrotatable part of a vehicle. A pair of friction pads 6A and 6B is disposed on the opposite sides of a rotatable disc 2 and is slidably supported by the arms 1A and 1B for sliding movement in the direction of the axis of the disc 2. The arms 1A and 1B of the stationary member 1 are provided with bores 7 extending in the direction of the axis of the disc 2. A caliper 4 incorporating an actuator 8 on one side thereof for urging one friction pad 6A (the lower one in Fig. 1) directly against one surface of the disc 2 straddles a minor portion of the periphery of the disc 2 and extends to the back side of the other friction pad 6. A pair of parallel pins 3 extending in the direction of the axis of the disc 2 is secured to the caliper 4 by means of bolts 9 and 9 respectively.
A rigid cylindrical sleeve or a liner 10 according to the present invention is forcibly inserted in each of the bores 7 and slidably receives each of the pins 3, whereby the caliper 4 is slidably mounted on the stationary member 1. The sleeve 10 is preferably formed of hard synthetic resin or of a steel pipe with the inner surface thereof being accurately finished by grinding or the like. A radial flange 10A is formed on one end of the sleeve 10 projecting out of the bore 7 as shown in Fig.
4 for clamping one end of a boot 12 against the adjacent surface of the stationary member 1. The other end of the boot 12 is received in an annular groove 11 formed on a large diameter portion 3A of the pin 3. The boot 12 effectively covers sliding portion between the sleeve 10 and the pin 3 and prevents the ingress of water or dusts.
Although not shown in the drawings, a bushing formed of a resilient material may be fitted around at least one of the pins 3 so that the bushing is slidably received in the sleeve 10.
In operation, the bushing moves integrany with the pin 3 with respect to the bore 7 so that the outer peripheral surface of the bushing slides on the inner peripheral surface of the sleeve 10.
Fig. 5 shows another embodiment of the present invention in which the bore 7 formed in the stationary member 1 has two open ends, and a rigid cylindrical sleeve or liner 10 having a closed end and an open flanged end is forcibly fitted in the bore 7. A cap 13 closes an open end of the bore 7 adjacent to the closed end of the sleeve 10. The function and effects of the second embodiment are generally similar to the first embodiment, and same numerals are applied to corresponding parts.
The sleeve 10 of the second embodiment may alternatively be secured to the stationary member 1 by an integral casting process, whereby any drilling process for forming the bore 7 can be omitted.
In short, a material aspect of preferred em- bodiments of the present- invention is to provide a rigid cylindrical sleeve or liner with the inner surface thereof being accurately finished beforehand, and a bore in the stationary member for integrally receiving the sleeve or liner, whereby a pin secured to the caliper of a spottype disc brake of the reaction kind is slidably received in the sleeve or liner.
The present invention is advantageously applied to the disc brake having a stationary member formed of castings such as cast iron the machining and finishing operation of which is troublesome. The sliding movement of the pin or a bushing covering the outer surface of the pin is guided by the inner surface of the rigid cylindrical sleeve which has been accurately and smoothly finished beforehand and secured to the stationary member, thus, it is possible to exclude troublesome and expensive surface finishing work of the bore of the stationary member for guiding the sliding movement of the pin, and it is easy to assure a desired surface roughness on the internal surface of a bore guiding the sliding movement of the pin or a bushing covering the outer surface of the pin.
Further, by providing a radially outwardly extending flange portion 10A on the outer end of the sleeve 10 and forcibly inserting the sleeve into the bore 7 formed in the stationary member 1, according to the preferred embodiment of the present invention, it is possible to tightly and sealingly clamp one end of a dust preventing boot between the flange portion and the stationary member without utilizing any additional member such as a boot securing cap or the like.
WHAT WE CLAIM IS:- 1. A spot-type disc brake including a stationary member adapted to be secured to a non-rotatable part of a vehicle, a caliper member adapted to straddle a minor portion of the periphery of a rotatable disc, and means slidably supporting said caliper member on said stationary member; said means comprising at least one pin secured to one of said members and extending in a direction parallel to the disc axis, a bore formed in the other of said members, and a rigid cylindrical sleeve or liner fixedly received in the bore and slidably receiving said pin.
2. A disc brake as claimed in claim 1 in which said sleeve or liner is formed of hard synthetic resin material or steel tube, with the inner peripheral surface thereof being accurately finished beforehand.
3. A disc brake as claimed in claim 2 in which said sleeve or liner is force fitted into said bore.
4. A disc brake as claimed in claim 2 in which said sleeve or liner comprises a steel tube and is cast integrally with the other of said members.
5. A disc brake as claimed in claim 1 in which the pin is secured to the caliper member and the bore is a through bore formed in the stationary member, the sleeve or liner hav ing one closed end.
6. A disc brake as claimed in any preceding
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    pads 6A and 6B is disposed on the opposite sides of a rotatable disc 2 and is slidably supported by the arms 1A and 1B for sliding movement in the direction of the axis of the disc 2. The arms 1A and 1B of the stationary member 1 are provided with bores 7 extending in the direction of the axis of the disc 2. A caliper 4 incorporating an actuator 8 on one side thereof for urging one friction pad 6A (the lower one in Fig. 1) directly against one surface of the disc 2 straddles a minor portion of the periphery of the disc 2 and extends to the back side of the other friction pad 6. A pair of parallel pins 3 extending in the direction of the axis of the disc 2 is secured to the caliper 4 by means of bolts 9 and 9 respectively.
    A rigid cylindrical sleeve or a liner 10 according to the present invention is forcibly inserted in each of the bores 7 and slidably receives each of the pins 3, whereby the caliper 4 is slidably mounted on the stationary member 1. The sleeve 10 is preferably formed of hard synthetic resin or of a steel pipe with the inner surface thereof being accurately finished by grinding or the like. A radial flange 10A is formed on one end of the sleeve 10 projecting out of the bore 7 as shown in Fig.
    4 for clamping one end of a boot 12 against the adjacent surface of the stationary member 1. The other end of the boot 12 is received in an annular groove 11 formed on a large diameter portion 3A of the pin 3. The boot 12 effectively covers sliding portion between the sleeve 10 and the pin 3 and prevents the ingress of water or dusts.
    Although not shown in the drawings, a bushing formed of a resilient material may be fitted around at least one of the pins 3 so that the bushing is slidably received in the sleeve 10.
    In operation, the bushing moves integrany with the pin 3 with respect to the bore 7 so that the outer peripheral surface of the bushing slides on the inner peripheral surface of the sleeve 10.
    Fig. 5 shows another embodiment of the present invention in which the bore 7 formed in the stationary member 1 has two open ends, and a rigid cylindrical sleeve or liner 10 having a closed end and an open flanged end is forcibly fitted in the bore 7. A cap 13 closes an open end of the bore 7 adjacent to the closed end of the sleeve 10. The function and effects of the second embodiment are generally similar to the first embodiment, and same numerals are applied to corresponding parts.
    The sleeve 10 of the second embodiment may alternatively be secured to the stationary member 1 by an integral casting process, whereby any drilling process for forming the bore 7 can be omitted.
    In short, a material aspect of preferred em- bodiments of the present- invention is to provide a rigid cylindrical sleeve or liner with the inner surface thereof being accurately finished beforehand, and a bore in the stationary member for integrally receiving the sleeve or liner, whereby a pin secured to the caliper of a spottype disc brake of the reaction kind is slidably received in the sleeve or liner.
    The present invention is advantageously applied to the disc brake having a stationary member formed of castings such as cast iron the machining and finishing operation of which is troublesome. The sliding movement of the pin or a bushing covering the outer surface of the pin is guided by the inner surface of the rigid cylindrical sleeve which has been accurately and smoothly finished beforehand and secured to the stationary member, thus, it is possible to exclude troublesome and expensive surface finishing work of the bore of the stationary member for guiding the sliding movement of the pin, and it is easy to assure a desired surface roughness on the internal surface of a bore guiding the sliding movement of the pin or a bushing covering the outer surface of the pin.
    Further, by providing a radially outwardly extending flange portion 10A on the outer end of the sleeve 10 and forcibly inserting the sleeve into the bore 7 formed in the stationary member 1, according to the preferred embodiment of the present invention, it is possible to tightly and sealingly clamp one end of a dust preventing boot between the flange portion and the stationary member without utilizing any additional member such as a boot securing cap or the like.
    WHAT WE CLAIM IS:- 1. A spot-type disc brake including a stationary member adapted to be secured to a non-rotatable part of a vehicle, a caliper member adapted to straddle a minor portion of the periphery of a rotatable disc, and means slidably supporting said caliper member on said stationary member; said means comprising at least one pin secured to one of said members and extending in a direction parallel to the disc axis, a bore formed in the other of said members, and a rigid cylindrical sleeve or liner fixedly received in the bore and slidably receiving said pin.
  2. 2. A disc brake as claimed in claim 1 in which said sleeve or liner is formed of hard synthetic resin material or steel tube, with the inner peripheral surface thereof being accurately finished beforehand.
  3. 3. A disc brake as claimed in claim 2 in which said sleeve or liner is force fitted into said bore.
  4. 4. A disc brake as claimed in claim 2 in which said sleeve or liner comprises a steel tube and is cast integrally with the other of said members.
  5. 5. A disc brake as claimed in claim 1 in which the pin is secured to the caliper member and the bore is a through bore formed in the stationary member, the sleeve or liner hav ing one closed end.
  6. 6. A disc brake as claimed in any preceding
    claim in which a radially outwardly extending flange portion is formed on one end of said sleeve or liner to clamp one end of a dust preventing boot.
  7. 7. A disc brake as claimed in any preceding claim in which the pin is secured to the caliper member and the bore is in the stationary member.
  8. 8. A disc brake as claimed in any preceding claim in which the stationary member is adapted to slidably support brake pad assemblies at opposite sides of said minor portion of the disc periphery.
  9. 9. A spot-type disc brake constructed substantially as herein described with reference to and as illustrated in Figs. 1 to 4 of the accompanying drawings.
  10. 10. A spot-type disc brake constructed substantially as herein described with reference to and as illustrated in Fig. 5 of the accompanying drawings.
GB1947578A 1977-05-20 1978-05-15 Spot-type discbrake Expired GB1597778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5842777A JPS53143866A (en) 1977-05-20 1977-05-20 Disc brake

Publications (1)

Publication Number Publication Date
GB1597778A true GB1597778A (en) 1981-09-09

Family

ID=13084073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1947578A Expired GB1597778A (en) 1977-05-20 1978-05-15 Spot-type discbrake

Country Status (6)

Country Link
JP (1) JPS53143866A (en)
AU (1) AU3585478A (en)
BR (1) BR7803197A (en)
DE (1) DE2822007A1 (en)
GB (1) GB1597778A (en)
PL (1) PL206934A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151728A (en) * 1983-12-23 1985-07-24 Teves Gmbh Alfred Floating caliper spot-type disc brake
EP0261357A2 (en) * 1986-09-26 1988-03-30 AlliedSignal Inc. Integrated disc brake and drum brake construction

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125738U (en) * 1982-02-19 1983-08-26 トキコ株式会社 disc brake
DE3544362A1 (en) * 1985-12-14 1987-06-19 Teves Gmbh Alfred Pin guide for a spot-type disc brake
US4784241A (en) * 1986-09-26 1988-11-15 Allied-Signal Inc. Integrated disc brake and drum rake construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151728A (en) * 1983-12-23 1985-07-24 Teves Gmbh Alfred Floating caliper spot-type disc brake
EP0261357A2 (en) * 1986-09-26 1988-03-30 AlliedSignal Inc. Integrated disc brake and drum brake construction
EP0261357A3 (en) * 1986-09-26 1990-02-14 AlliedSignal Inc. Integrated disc brake and drum brake construction

Also Published As

Publication number Publication date
JPS53143866A (en) 1978-12-14
PL206934A1 (en) 1979-07-16
AU3585478A (en) 1979-11-15
DE2822007A1 (en) 1978-11-23
BR7803197A (en) 1979-02-06

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Legal Events

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