GB2051983A - Disc brake and friction pad assembly therefor - Google Patents

Disc brake and friction pad assembly therefor Download PDF

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Publication number
GB2051983A
GB2051983A GB8020667A GB8020667A GB2051983A GB 2051983 A GB2051983 A GB 2051983A GB 8020667 A GB8020667 A GB 8020667A GB 8020667 A GB8020667 A GB 8020667A GB 2051983 A GB2051983 A GB 2051983A
Authority
GB
United Kingdom
Prior art keywords
sheath
backing plate
friction
aperture
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
GB8020667A
Other versions
GB2051983B (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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB8020667A priority Critical patent/GB2051983B/en
Publication of GB2051983A publication Critical patent/GB2051983A/en
Application granted granted Critical
Publication of GB2051983B publication Critical patent/GB2051983B/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
    • F16D55/227—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
    • 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
    • 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
    • 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
    • F16D2065/026—Braking members; Mounting thereof characterised by a particular outline shape of the braking member, e.g. footprint of friction lining
    • 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
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/0004—Materials; Production methods therefor metallic
    • F16D2200/0008—Ferro
    • F16D2200/0017—Ferro corrosion-resistant

Landscapes

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

Abstract

A sheath (15) preferably of corrosion-resistant material and an interference fit, is provided in an aperture (16) in the backing plate (17) of the friction pad assembly (18) and extends towards the plane containing the disc-engaging face of the friction pad (19) which is secured to the backing plate (17). The sheath always covers the end region (14) of an extended portion of pin (10), and is contacted and abraded by the disc (A) of the brake as the friction pad (18) wears. Thus the extended portion (14) of the pin (10) is protected against corrosion, providing for the smooth movement of the friction pad assembly (18) thereon. <IMAGE>

Description

SPECIFICATION Disc brake and friction pad assembly therefor The present invention relates to a friction pad assembly for use in a spot-type disc brake, and a disc brake incorporating such a friction pad assembly.
In certain opposed-piston disc brakes the friction pad assemblies are supported and guided on short pins which engage through holes in the friction pad assemblies. The surface of these pins is however exposed to the weather and liable to corrosion which can affect the efficiency of the brake. This is clearly undesirable.
Pin sliding disc brakes can basically comprise either a caliper slidably mounted by virtue of a pin or pins secured to or sliding in a torque plate. In use, an actuator in the caliper acts directly upon a friction pad assembly i.e. normally in inboard friction pad assembly, to move this inboard friction pad assembly onto the disc, reaction forces causing relative movement between the caliper and the torque plate and thus applying the other friction pad assembly i.e. normally the outboard friction pad assembly, onto the disc. In most spottype disc brakes the friction pad assemblies are guided for movement towards the disc in guides which are open to the atmosphere and hence liable to corrosion.
In many pin sliding disc brakes the inboard friction pad assembly is located on separate guides which are open to corrosion. The corrosion can affect the efficiency of the brake since the inboard friction pad assembly should move first to enable reaction forces to apply the outboard friction pad assembly. The pin or pins upon which the caliper or torque plate is.located are known to be protected by boots so that it is then only the abovementioned separate guides for the inboard friction pad assembly, which are subject to corrosion.
It is an aim of the present invention to provide a friction pad assembly for use in a disc brake, together with such a disc brake, whereby the above affects of corrosion are obviated.
According to the present invention there is provided a friction pad assembly for use in a disc brake, comprising a backing plate to which a pad of friction material is secured, a sheath being located in an aperture in the backing plate and extending beyond the backing plate towards the plane in which the face of the pad remote from the backing plate lies.
Preferably the sheath is an interference fit in the aperture in the backing plate and is made of a material which abrades in unison with the pad of friction material when applied to the disc of the brake. Alternatively the sheath may be made of a material which is softer than the pad of friction material and which thus abrades more easily than the friction material when applied to a disc of a brake. Also, the sheath may alternatively be a loose fit in the aperture in the backing plate.
In a pin sliding disc brake the pin or pins can extend to engage through the sheath in the aperture in the backing plate of the inboard friction pad assembly or separate pin abutments can be provided. The pin or pins thus additionally act as guides and support the inboard friction pad assembly, the sheath or sheaths protecting the extended portion of the pin or pins, thus preventing corrosion of the working surfaces.
Similarly in certain opposed-piston disc brakes wherein the friction pad assemblies are supported on pins, the sheaths can protect the sliding surfaces of the pins.
According to a further feature of the present invention there is provided a spot-type disc brake comprising a caliper and torque plate, a friction pad assembly comprising a backing plate with a pad of friction material secured thereto, being slidably supported on at least one pin which extends through an aperture in the backing plate, the or each pin being protected by a sheath which also passes through the aperture and which extends towards the plane in which the face of the pad of friction material remote from the backing plate, lies.
According to a still further feature of the present invention there is provided a pin sliding disc brake comprising a caliper and a torque plate, at least one pin providing a sliding connection between the caliper and torque plate, an extended portion of the or each pin passing through an aperture in a backing plate of a friction pad assembly, a pad of friction material being secured to the backing plate, the or each extended pin portion being protected by a sheath which also passes through the aperture and which extends towards the plane in which the face of the pad of friction material remote from the backing plate, lies, and which always covers the end region of the extended pin portion.
Thus, in a disc brake constructed in accordance with the present invention, a friction pad assembly is supported on a pin or pins also used to provide the sliding connection between the caliper and the torque plate, a sheath of corrosion resistant material protecting the extended portion of the pin. The sheath may be movable in the aperture in the backing plate so that it may move axially relative to the aperture as the friction pad wears.
However, preferably the sheath is secured in the aperture, e.g. it is an interference fit, and is made of a material which abrades in unison with the friction material as the pad wears during normal use. Alternatively the sheath may be of a softer material than the pad of friction material and may abrade easily as the pad wears. It will be appreciated that as the pad wears so the pin or pins will become exposed between the torque plate and the backing plate, and be liable to corrosion. This will not affect immediate performance but the pins will have to be cleaned to remove corrosion before new friction pad assemblies are installed. To overcome this liability to corrosion boots may be provided between the torque plate and backing plate to protect the pins as the pad wears.
The present invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a front view of one embodiment of a friction pad assembly constructed according to the present invention; Fig. 2 is a cross-sectional view along line I--I in Fig. 1; Fig. 3 is a front view of another embodiment of friction pad assembly constructed according to the present invention; Fig. 4 is a plan view, partially in cross-section, of a twin pin sliding caliper disc brake according to the present invention; Fig. 5 is a detailed view of part of a modified sheath for use in the present invention; and Fig. 6 is a cross-sectional view of an alternative form of sheath suitable for use in the present invention.
Considering Figs. 1 and 2 of the accompanying drawings, here is shown a friction pad assembly comprising a backing plate 1, to which a pad 2 of friction material is secured. The backing plate 1 has two laterally extending ears 3, an aperture 4 being provided in each ear 3. As best seen in Fig.
2, a sheath 5 of a corrosion resistant material is an interference fit in each aperture 4, the sheath having a radially extending flange 6 which enables the sheath to be accurately located in the aperture 4. Alternatively sheath 5 can be a loose fit in aperture 4.
The friction pad assembly shown in Fig. 3 differs from that of Figs. 1 and 2, only by virtue of the fact that it has only one laterally extending ear 7, this friction pad assembly being suitable for a single pin sliding caliper disc brake.
Fig. 4 is a plan view, partially in cross-section, of a twin pin sliding caliper disc brake according to the present invention. The brake basically comprises a caliper generally designated 8, which is slideably mounted on a torque plate 9 by means of two pins 10 (only one of which is evident by virtue of the partial cross-section). The pins 10 are identically arranged and for the sake of clarity reference will now only be made to the illustrated pin 10. The pin 10 is secured to the torque plate at 11, one end region 12 of the pin 10 extending in a bore 13 in the caliper 8.The other end region 14 of pin 10 extends through a sheath 1 5 of corrosion resistant material which is an interference fit in an aperture 1 6 in the backing plate 1 7 of inboard friction pad assembly 1 8.
Alternatively sheath 1 5 can be a loose fit and axially movable relative to aperture 1 6. Inboard friction pad assembly 1 8 is thus supported by pins 10 and basically comprises backing plate 17 to which a pad 1 9 of friction material is secured, and sheath 1 5 engaging in aperture 16.
When the brake is operated, hydraulic actuator 20 presses on backing plate 1 7 causing friction pad assembly 1 8 to slide on end regions 14 of pins 10 and to engage disc A. Reaction forces cause caliper 8 to slide on end regions 1 2 of pin 10, outboard friction pad assembly 21 also engaging disc A. As the friction pad assemblies 18, 21 wear, so the sheath 15 moves with backing plate 1 7 towards disc A exposing end region 14 of pin 10 at 22. The sheath eventually engages disc A and is abraded thereby in unison with pad 1 9. The material of the sheath can be softer than that of the friction pad so that it abrades easily.
Whilst pin 10 is exposed at 22 and is liable to corrosion, this does not effect the brake performance as the working surfaces at any one time are not exposed. However the pins 10 shall require cleaning to remove corrosion before the installation of new friction pad assemblies. To obviate the necessity for this latter cleaning a boot 23 (shown in dashed lines) can be provided between the torque plate 9 and backing plate 17 to protect the exposed pin regions at 22.
To replace the friction pad assembly 1 8, cap B is removed to expose the end or pin 10. Then by rotating pin 10 using a suitable tool, the pin can be unscrewed from the torque plate 9 and drawn through bore 13, extended pin portions 14 releasing the friction pad assembly.
Whilst the sheath 1 5 is shown in Figs. 2 and 4 as a mere sleeve of corrosion resistant material, alternative sheaths can be used to advantage. Two such alternatives are shown in Figs. 5 and 6. The sheath of Fig. 5 has small annular grooves 24 in its inner wall, which allow for the retention of a lubricant. These grooves 24 can be in the form of a screw thread or helix which can be provided in a sleeve located in the sheath. The sheath of Fig. 6 incorporates an anti-friction bearing 25.
Thus in the present invention the inboard friction assembly is supported on the pins which are also used for the connection between caliper and torque plate, a sheath protecting the bearing surfaces of the pins and preventing corrosion occurring, which corrosion could effect brake performance.

Claims (20)

1. A friction pad assembly for use in a disc brake, comprising a backing plate to which a pad of friction material is secured, a sheath being located in an aperture in the backing plate and extending beyond the backing plate towards the plane in which the face of the pad remote from the backing plate lies.
2. A friction pad assembly as claimed in claim 1, in which the sheath is an interference fit in the aperture in the backing plate and is made of a material which abrades in unison with the pad of friction material when applied to the disc of a brake.
3. A friction pad assembly as claimed in claim 1, in which the sheath is an interference fit in the aperture in the backing plate and is made of a material which is softer than the pad of friction material and thus abrades easier than the pad of friction material when applied to the disc of a brake.
4. A friction pad assembly as claimed in claim 1, in which the sheath is a loose fit in said aperture.
5. A friction pad assembly as claimed in any one of the preceding claims, in which the sheath has a radially outwardly extending flange which prevents the sheath from passing completely through said aperture.
6. A triction pad assembly as claimed in any one of the preceding claims, in which the sheath is made of a corrosion-resistant material.
7. A friction pad assembly as claimed in any one of the preceding claims, in which the sheath has small annular grooves on its inner wall.
8. A friction pad assembly as claimed in any one of claims 1 to 6, in which the sheath incorporates an anti-friction bearing.
9. A spot-type disc brake comprising a caliper and torque plate, a friction pad assembly comprising a backing plate with a pad of friction material secured thereto, being slidably supported on at least one pin which extends through an aperture in the backing plate, the or each pin being protected by a sheath which also passes through the aperture and which extends towards the plane in which the face of the pad of friction material remote from the backing plate, lies.
10. A pin sliding disc brake comprising a caliper and a torque plate, at least one pin providing a sliding connection between the caliper and torque plate, an extended portion of the or each pin passing through an aperture in a backing plate of a friction pad assembly, a pad of friction material being secured to the backing plate, the or each extended pin portion being protected by a sheath which also passes through the aperture and which extends towards the plane in which the face of the pad of friction material remote from the backing plate, lies, and which always covers the end region of the extended pin portion.
1 A disc brake as claimed in claim 9 or 10, in which the sheath is an interference fit in the aperture in the backing plate and is made of a material which abrades in unison with the pad of friction material when applied to the disc of a brake.
12. A disc brake as claimed in claim 9 or 10, in which the sheath is an interference fit in the aperture in the backing plate and is made of a material which is softer than the pad of friction material and thus abrades easier than the pad of friction material when applied to the disc of a brake.
13. A disc brake as claimed in claim 9 or 10. in which the sheath is a loose fit in said aperture.
14. A disc brake as claimed in any one of claims 9 to 13, in which the sheath has a radially outwardly extending flange which prevents the sheath from passing completeiy through said aperture.
1 5. A disc brake as claimed in any one of claims 9 to 14, in which the sheath is made of a corrosion-resistant material.
16. A disc brake as claimed in any one claims 9 to 15, in which the sheath has small annular grooves on its inner wall, for the passage of a lubricant.
17. A disc brake as claimed in any one of claims 9 to 15, in which the sheath incorporates an antifriction bearing.
18. A disc brake as claimed in any one of claims 9 to 17, in which a flexible protective boot protects the pin between the sheath and the torque plate.
19. A friction pad assembly for use in a disc brake, constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
20. A disc brake constructed substantially as hereinbefore described with reference to and as illustrated in Fig. 4 of the accompanying drawings.
GB8020667A 1979-06-26 1980-06-24 Disc brake and friction pad assembly therefor Expired GB2051983B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8020667A GB2051983B (en) 1979-06-26 1980-06-24 Disc brake and friction pad assembly therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7922203 1979-06-26
GB8020667A GB2051983B (en) 1979-06-26 1980-06-24 Disc brake and friction pad assembly therefor

Publications (2)

Publication Number Publication Date
GB2051983A true GB2051983A (en) 1981-01-21
GB2051983B GB2051983B (en) 1983-06-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8020667A Expired GB2051983B (en) 1979-06-26 1980-06-24 Disc brake and friction pad assembly therefor

Country Status (1)

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GB (1) GB2051983B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498423A1 (en) * 1991-02-08 1992-08-12 Knorr-Bremse Ag Disc brake for rail vehicles
DE4126197A1 (en) * 1991-08-08 1993-02-11 Teves Gmbh Alfred FLOATING FRAME DISC BRAKE WITH COMFORTABLE BRAKE SHOE ARRANGEMENT

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498423A1 (en) * 1991-02-08 1992-08-12 Knorr-Bremse Ag Disc brake for rail vehicles
DE4126197A1 (en) * 1991-08-08 1993-02-11 Teves Gmbh Alfred FLOATING FRAME DISC BRAKE WITH COMFORTABLE BRAKE SHOE ARRANGEMENT

Also Published As

Publication number Publication date
GB2051983B (en) 1983-06-29

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Legal Events

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

Effective date: 19930624