GB1585755A - Disc brakes - Google Patents

Disc brakes Download PDF

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Publication number
GB1585755A
GB1585755A GB634578A GB634578A GB1585755A GB 1585755 A GB1585755 A GB 1585755A GB 634578 A GB634578 A GB 634578A GB 634578 A GB634578 A GB 634578A GB 1585755 A GB1585755 A GB 1585755A
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GB
United Kingdom
Prior art keywords
portions
clip
pad retaining
retaining pins
insert
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
GB634578A
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 GB1585755A publication Critical patent/GB1585755A/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
    • 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
    • F16D2055/007—Pins holding the braking members

Landscapes

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

Description

(54) IMPROVEMENTS RELATING TO DISC BRAKES (71) We, TOKICO LTD., a Japanese body corporate of 6-3, Fujimi l-chome, Kawasaki-ku, Kawasaki-shi, Kanakawa-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 disc brake of the type including a main body, a pair of friction pads disposed on the opposite sides of -a rotatable disc, a pair of pad retaining pins at least one end of each pin being mounted on the main body, and a captive member or a clip preventing withdrawal of the pins from the main body.
Disc brakes of this type are, for example, shown in British Patent specification Nos. 1 250 458 and 1 375 697, and U.S.
Patent specification No. 3 656 589.
The captive members shown in British Patent specification 1 375 697 and US Patent specification 3 656 589 are cotter pins of conventional type inserted separately in respective transverse holes in pad retaining pins. The construction is very simple, but the mounting or demounting operation is very troublesome and time consuming since the space availabIe is usually limited. The captive member shown in British Patent specification No. 1 250 458 (Girling Ltd.) is a spring formed of a one piece of wire rod, -but there are observed shortcomings such that the configuration of the spring is very complicated, many bends being formed on the wire rod whereby the strength of the wire rod is reduced and, further, mounting or demounting operation of the spring clip is not easy. Also there are problems in the space for mounting the spring clip.
Although there are some further proposals with respect to one-piece type captive members or spring clips, the shortcomings mentioned hereabove have not as yet been overcome effectively.
An aim of the present invention is to provide a captive spring or a spring clip in a disc brake for preventing withdrawal of pad retaining pins in disc brakes, the captive spring or clip having a simplified configuration and being easy in mounting or demounting in a limited space.
According to the present invention there is provided a disc brake comprising a main body, a pair of friction pads respectively disposed on the opposite sides of a rotatable disc, a pair of pad retaining pins for locating the friction pads radially with respect to the disc, at least one end of each pad retaining pin being mounted on the main body, and a spring clip formed of a wire rod for preventing withdrawal of the pad retaining pins from the main body, the opposite ends of said clip extending through transverse holes formed respectively in the pad retaining pins, said spring clip comprising parallel insert portions defined at the opposite ends of the clip and being spaced by a distance substantially equal to the distance between the axes of the pad retaining pins, clamp portions contiguous with the respective insert portions and turned outwards and backwards relative to the insert portions so as to extend generally along the outside surfaces of the pad retaining pins and adapted to co-operate with the insert portions to clamp the pad retaining pins therebetween, extension portions contiguous with the respective clamp portions and being turned outwards and backwards so as to extend in the direction parallel to the insert portions and to extend beyond the bends between the insert portions and the clamp portions, and a connecting portion connecting the extension portions with one another and extending over the pad retaining pins.
The present invention will now be further described, by way of example, with reference to the accompanying drawings in which : Fig. 1 is a partial cross-sectional view of one embodiment of a disc brake according to the present invention, incorporating a captive spring; Fig. 2 is a cross-sectional view taken along the line II-II in Fig. 1; and Fig. 3 is a schematic view showing a captive spring of prior art.
The disc brake shown in Figs. 1 and 2 comprises a main body 10 having two opposing leg portions 10a and 10b, which straddles a portion of the circumference of a rotatable disc 11. There is formed an opening 12 in the main body 10 which is open in the upward direction as viewed in Fig. 1 (radially outward direction with respect to the axis of the disc 11). A pair of parallel pad retaining pins 15 and 16 are inserted respectively through aligned openings 13 and 14 formed respectively in the leg portions 10a and 10b, to extend respectively in the direction parallel to the axis of the disc 11. Alternatively, only one end of each pad retaining pin may be located in an opening in the main body.
The pins 15 and 16 pierce also through respective openings formed in backplates of a pair of friction pads 17 and 18 respectively disposed on opposite sides of disc 11. It will be understood that the pins 15 and 16 act to locate friction pads in the radial direction with respect to the disc 11, i.e. in the vertical direction in Fig. 1, and the movement of the friction pads 17 and 18 in the direction of the circumference to the disc (i.e. in the direction vertical to the paper of Fig. 1) is restricted by a stationary member (not shown) or the main body. The disc brake further comprises a hydraulic piston 19 working in a cylinder chamber formed in the leg portion 10a of the main body 10 for urging friction pad 17 directly against disc 11 to thus apply the brake, a dust boot 20 protecting sliding surfaces between the cylinder chamber and the pis ton 19. The main body 10 is supported slidably on the stationary member and due to fiction pad 17 being pressed against disc 11, the main body 10 slides on the stationary member in the direction of the axis of the disc 11, pressing friction pad 18 against the disc 11 and thus applying the brake.
Openings in the form of transverse holes, 15a and 16a, are formed in the pad retaining pins 15 and 16 respectively, at the position adjacent to the inner ends of respective openings 13 and 14 of the leg portions 10a and 10b of the main body 10.
The ends of a captive spring clip 21 are inserted in the holes 15a and 16a respectively to prevent withdrawal of the pins 15 and 16 from the main body.
The clip 21 is formed of a single resilient wire rod and is shaped to have the form shown in Fig. 2, i.e. the clip 21 comprises parallel insert portions 22, defined respectively at the opposite ends of the wire rod and adapted to be inserted into the through holes l5a and 16a of the pins 15 and 16 respectively when the holes 15a and 16a are oriented parallel and in a generally vertical direction in Fig. 1, ie., the opposite ends of the clip are spaced by a distance substantially equal to the distance between the axes of the pad retaining pins, clamp portions 23 contiguous with respective insert portions 22 and being turned outwards and backwards relative to the insert portions 22 so as to extend generally along the outward side surfaces 15b and 16b of the pins and adapted to co-operate with insert portions 22 to clamp the pins 15 and 16 therebetween, extension portions 24 contiguous with the respective clamp portions 23 and being turned outwards and backwards so as to extend upwards (in the direction generally parallel with respect to the insert portions 22) and to extend beyond bends 22a which are defined between the insert portions and the clamp portions, and a connecting portion extending over the pins 15 and 16 and connecting the extension portions 24. Operator portions 26 are provided at the opposite end portions of the connecting portion 25.
Usually, it is difficult to see the holes 15a and 16a in the pad retaining pins 15 and 16 from the outside when the brake has been mounted on a vehicle, thus, the disc brake according to the above embodiment has cutout portions 27 in the leg portion 10a of the main body 10 adjacent to respective end portions of the clip for permitting the holes 15a and 16a to be seen diagonally from the outside. Further, the cutout portions 27 act as inclined grooves for guiding tools to the operator portions 26 and 26 when demounting the clip 21 from the disc brake.
In mounting the clip 21 on the pad retaining pins 15 and 16, it is not necessary to expand or contract the distance between the insert portions 22 and 22, since the distance between the insert portions in the free condition of the clip 21 is substantially equal to the distance A between the holes 15a and 16a when the holes are oriented in the parallel upward direction as shown in Fig. 2. Further, the alignment of the insert portions 22 with respect to the holes l5a and 16a can be effected easily by looking at the holes diagonally through cutout portions 27.
Fig. 3 shows an example of a prior art spring clip having a simplified configuration, which is retained in its position by resilient force acting to expand the leg portions in the direction separating from one another.
Thus, it is necessary to apply a relatively large contracting force in the sidewise direction in the drawing in mounting the spring clip.
In inserting the insert portions 22 of the clip 21 into the holes l5a and 16a, the clamp portions 23 are expanded forciblv in the outward directions (i.e. in the directions separating them from their respective adjacent insert portions) and, thereafter, the pad retaining pins 15 and 16 are clamped between the insert portions and the clamp portions respectively. It will be understood that the minimum clearance between the insert portions and corresponding clamp portions is smaller than the maximum width between the through holes 15a and 16a and the outer surfaces 15b and 16b of the pad retaining pins 15 and 16 respectively, so that the clip 21 will not be withdrawn out from the holes 15a and 16a. Further, the clamp portions 23 may resiliently engage with the outer surfaces 15b and 16b in the clamping condition but, alternatively, a small clearance may be left between the pad retaining pins 15 and 16 and the clamp portions 23 or the insert portions 22 of the clip 21 in the clamping condition.
In demounting the clip 21 from the pad retaining pins 15 and 16, suitable tools such as screw-drivers or the like are inserted through cutout portions 27. Applying the tip ends of screw drivers on the lowerside of the operator portions 26 and 26, the operator portions can be raised upwardly.
A force expanding the clamp portions in the outward directions l(in the direction separating from corresponding insert portions 22 and 22) will thus act on the clip 21, thus, the clip 21 can be withdrawn easily.
The main body 10 shown in the drawing is of the type as shown in British Patent Specification No. 1 375 697 wherein the main body 10 is a rigid caliper supported slidably on a stationary member. However, the present invention may be applied to disc brakes of other types, for example, such as shown in US Patent Specification No. 3 656 589 wherein the part corresponding to the body member 10a is a stationary member and the part corresponding to body member 10b is a plate-like yoke.
As described heretofore, the present embodiment can overcome shortcomings in prior art captive springs or clips such that it is required to apply a relatively large force in mounting or demounting the clip and that it is difficult to maintain the orientation of the transverse openings or clip receiving holes in the pad retaining pins suitable, particularly in the case where it is necessary to deform the clip bodily in mounting operation, and that a dust cover or boots provided in the disc brake will sometimes be damaged when the clip is installed at a location adjacent to the hydraulic actuator and, further, it is difficult to align the ends of the clip with the clip receiving holes when mounting the clip since available space is usually limited.
Further, the following advantages can be attained by a disc brake constructed according to the present embodiment, namely: a) The insert portions of the clip are formed such that they can be inserted into corresponding holes in pad retaining pins without expanding or contracting the distance between the insert portions, thus, the mounting operation can be performed easily.
b) The clamp portions of the clip are arranged on the outsides of pad retaining pins, thus, the space between the clamp portions and the dust boot can be increased such that the clip will not contact with the dust boot and the risk of injury of the dust boot can be decreased.
c) The operator portions are formed in the connecting portion, thus, it is possible to decrease the number of bends in the clip, and manufacture of the clip can be simplified with the manufacturing costs reduced, though the strength of the spring will not be decreased.
d) The force applied on the operator portions will act to expand the lower end portions of clamp portions from the insert portions, thus demounting process of the clip can be effected very easily.
e) The insert portions and the clamp portions are arranged inside of extension portions and the connecting portion as viewed from the outside of the disc brake and, therefore, they are protected from failure which may be caused by foreign materials such as jumping stones or the like, and the withdrawal preventing function of the clip can be maintained reliably.
f) Cutout portions are formed in the main body, thus enabling the mounting or demounting of the clip to be performed very easily.
WHAT WE CLAIM IS:- 1. A disc brake comprising a main body, a pair of friction pads respectively disposed on the opposite sides of a rotatable disc, a pair of pad retaining pins for locating the friction pads radially with respect to the ciisc, at least one end of each pad retaining pin being mounted on the main body, and a spring clip formed of a wire rod for preventing withdrawal of the pad retaining pins from the main body, the opposite ends of said clip extending through transverse holes formed respectively in the pad retaining pins, said spring clip comprising parallel insert portions defined at the opposite ends of the clip and being spaced by a distance substantially equal to the distance between the axes of the pad retaining pins, clamp portions contiguous with the respective insert portions and turned outwards and backwards relative to the insert portions so as to extend generally along the outside surfaces of the pad retaining pins and adapted to co-operate with the insert portions to clamp the pad retaining pins therebetween, extension portions contiguous with the respective clamp portions and
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    between the insert portions and the clamp portions respectively. It will be understood that the minimum clearance between the insert portions and corresponding clamp portions is smaller than the maximum width between the through holes 15a and 16a and the outer surfaces 15b and 16b of the pad retaining pins 15 and 16 respectively, so that the clip 21 will not be withdrawn out from the holes 15a and 16a. Further, the clamp portions 23 may resiliently engage with the outer surfaces 15b and 16b in the clamping condition but, alternatively, a small clearance may be left between the pad retaining pins 15 and 16 and the clamp portions 23 or the insert portions 22 of the clip 21 in the clamping condition.
    In demounting the clip 21 from the pad retaining pins 15 and 16, suitable tools such as screw-drivers or the like are inserted through cutout portions 27. Applying the tip ends of screw drivers on the lowerside of the operator portions 26 and 26, the operator portions can be raised upwardly.
    A force expanding the clamp portions in the outward directions l(in the direction separating from corresponding insert portions 22 and 22) will thus act on the clip 21, thus, the clip 21 can be withdrawn easily.
    The main body 10 shown in the drawing is of the type as shown in British Patent Specification No. 1 375 697 wherein the main body 10 is a rigid caliper supported slidably on a stationary member. However, the present invention may be applied to disc brakes of other types, for example, such as shown in US Patent Specification No. 3 656 589 wherein the part corresponding to the body member 10a is a stationary member and the part corresponding to body member 10b is a plate-like yoke.
    As described heretofore, the present embodiment can overcome shortcomings in prior art captive springs or clips such that it is required to apply a relatively large force in mounting or demounting the clip and that it is difficult to maintain the orientation of the transverse openings or clip receiving holes in the pad retaining pins suitable, particularly in the case where it is necessary to deform the clip bodily in mounting operation, and that a dust cover or boots provided in the disc brake will sometimes be damaged when the clip is installed at a location adjacent to the hydraulic actuator and, further, it is difficult to align the ends of the clip with the clip receiving holes when mounting the clip since available space is usually limited.
    Further, the following advantages can be attained by a disc brake constructed according to the present embodiment, namely: a) The insert portions of the clip are formed such that they can be inserted into corresponding holes in pad retaining pins without expanding or contracting the distance between the insert portions, thus, the mounting operation can be performed easily.
    b) The clamp portions of the clip are arranged on the outsides of pad retaining pins, thus, the space between the clamp portions and the dust boot can be increased such that the clip will not contact with the dust boot and the risk of injury of the dust boot can be decreased.
    c) The operator portions are formed in the connecting portion, thus, it is possible to decrease the number of bends in the clip, and manufacture of the clip can be simplified with the manufacturing costs reduced, though the strength of the spring will not be decreased.
    d) The force applied on the operator portions will act to expand the lower end portions of clamp portions from the insert portions, thus demounting process of the clip can be effected very easily.
    e) The insert portions and the clamp portions are arranged inside of extension portions and the connecting portion as viewed from the outside of the disc brake and, therefore, they are protected from failure which may be caused by foreign materials such as jumping stones or the like, and the withdrawal preventing function of the clip can be maintained reliably.
    f) Cutout portions are formed in the main body, thus enabling the mounting or demounting of the clip to be performed very easily.
    WHAT WE CLAIM IS:- 1. A disc brake comprising a main body, a pair of friction pads respectively disposed on the opposite sides of a rotatable disc, a pair of pad retaining pins for locating the friction pads radially with respect to the ciisc, at least one end of each pad retaining pin being mounted on the main body, and a spring clip formed of a wire rod for preventing withdrawal of the pad retaining pins from the main body, the opposite ends of said clip extending through transverse holes formed respectively in the pad retaining pins, said spring clip comprising parallel insert portions defined at the opposite ends of the clip and being spaced by a distance substantially equal to the distance between the axes of the pad retaining pins, clamp portions contiguous with the respective insert portions and turned outwards and backwards relative to the insert portions so as to extend generally along the outside surfaces of the pad retaining pins and adapted to co-operate with the insert portions to clamp the pad retaining pins therebetween, extension portions contiguous with the respective clamp portions and
    being turned outwards and backwards so as to extend in the direction parallel to the insert portions and to extend beyond the bends between the insert portions and the clamp portions, and a connecting portion connecting the extension portions with one another and extending over the pad retaining pins.
  2. 2. A disc brake as claimed in claim 1, in which operator portions are defined at the opposite end portions of the connecting portion for engagement with tools in demounting the spring clip from the disc brake.
  3. 3. A disc brake as claimed in claim 1, in which inclined cutout grooves are formed in the main body at the position adjacent to respective end portions of the spring clip.
  4. 4. A disc brake constructed substantially as hereinbefore described with reference to and as illustrated in Figures 1 and 2 of the accompanying drawings.
GB634578A 1977-02-19 1978-02-17 Disc brakes Expired GB1585755A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1977019673U JPS589004Y2 (en) 1977-02-19 1977-02-19 Clip to prevent disc brake pad retaining pin from coming out

Publications (1)

Publication Number Publication Date
GB1585755A true GB1585755A (en) 1981-03-11

Family

ID=12005747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB634578A Expired GB1585755A (en) 1977-02-19 1978-02-17 Disc brakes

Country Status (3)

Country Link
JP (1) JPS589004Y2 (en)
DE (1) DE2806443A1 (en)
GB (1) GB1585755A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094287A1 (en) * 1982-05-07 1983-11-16 Allied Corporation Disc brake assembly
DE19520050A1 (en) * 1994-05-31 1995-12-07 Tokico Ltd Disc brake arrangement for motor vehicles esp. motorcycles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227195A1 (en) * 1982-07-21 1984-01-26 Alfred Teves Gmbh, 6000 Frankfurt Brake shoe for a spot-type disc brake

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094287A1 (en) * 1982-05-07 1983-11-16 Allied Corporation Disc brake assembly
US4522287A (en) * 1982-05-07 1985-06-11 The Bendix Corporation Disc brake with camming member and torsion spring for vibration control
DE19520050A1 (en) * 1994-05-31 1995-12-07 Tokico Ltd Disc brake arrangement for motor vehicles esp. motorcycles
DE19520050C2 (en) * 1994-05-31 1999-07-22 Tokico Ltd Disc brake

Also Published As

Publication number Publication date
JPS53113984U (en) 1978-09-11
JPS589004Y2 (en) 1983-02-18
DE2806443A1 (en) 1978-08-24

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee