GB2048402A - Disc brake - Google Patents

Disc brake Download PDF

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Publication number
GB2048402A
GB2048402A GB7913704A GB7913704A GB2048402A GB 2048402 A GB2048402 A GB 2048402A GB 7913704 A GB7913704 A GB 7913704A GB 7913704 A GB7913704 A GB 7913704A GB 2048402 A GB2048402 A GB 2048402A
Authority
GB
United Kingdom
Prior art keywords
disc
supporting member
caliper
friction
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.)
Withdrawn
Application number
GB7913704A
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
Priority to GB7913704A priority Critical patent/GB2048402A/en
Publication of GB2048402A publication Critical patent/GB2048402A/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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

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

Abstract

A disc brake including a stationary supporting member (1), a pair of friction pads (7, 9) slidably supported (e.g. by pins 3, 4) on the supporting member (1), a caliper (5) slidably supported on the supporting member (1), a piston (8) provided in the caliper (5) for acting on the friction pad (7) to urge it against one surface of the disc (2) and a pad spring (17) disposed between the caliper (5) and the friction pads (7, 9) has the other friction pad (9) is mounted on the supporting member (1) such that the pad (9) can be dismounted from the supporting member (1) by displacing the friction pad (9) on the supporting member (1) by a predetermined amount I2 and the caliper (5) being displaceable by an amount I1, I1 exceeding I2. The pad spring (17) has a portion (17f) to engage the friction pad (9) for limiting the displacement of the friction pad (9) the portion (17f) being removable to allow dismounting. The spring (17) also has portions for engaging the caliper and the supporting member. <IMAGE>

Description

SPECIFICATION Disc brake This invention relates to disc brakes and is particularly concerned with disc brakes of the floating caliper type.
One known floating caliper type disc brake includes a pair of friction pads disposed on the opposite sides of a rotatable disc, a supporting member which is adapted to be secured to a non-rotatable part of a vehicle and supports thereon the pair of friction pads so that the pads are slidable in the direction of the axis of the disc, and a caliper supported slidably in the direction of the axis of the disc on the supporting member and having a piston for pressing one of the friction pads against one surface of the disc and a leg portion engaging the outer friction pad for pressing it against the other surface of the disc. It has already been proposed to mount the friction pads on the supporting member such that the friction pads can be mounted on or dismounted from the supporting member by displacing the caliper on the supporting member in the direction of the axis of the disc.In such disc brakes, the friction pad exchanging operations can easily be performed, but the caliper may occasionally be displaced and the friction pads become unintentionally dismounted from the supporting member.
An object of the present invention is to prevent the latter shortcoming of the known brakes.
A disc brake in accordance with the present invention comprises a pair of friction pads disposed on opposite sides of a rotatable disc, a supporting member which is adapted to be secured to a non-rotatable part of a vehicle and supports thereon the pair of friction pads so that the pads are slidable on the supporting member in the direction of the axis of the disc, a caliper supported slidably in the direction of the axis of the disc on the supporting member and having a piston for pressing one of the friction pads against one side of the disc and a leg portion engaging the other friction pad for pressing the latter friction pad against the other side of the disc, and a pad spring disposed between the caliper and the pair of friction pads, the arrangement being such that said other friction pad can be dismounted from the supporting member by displacing it in a direction away from the disc by a predetermined amount, said caliper being displaceable by an amount exceeding said predetermined amount in the direction which separates the leg portion of the caliper from the disc, and said pad spring having a first retaining portion which engages the supporting member and a second retaining portion which is adapted to engage said other friction pad for limiting the displacement thereof within said predetermined amount.
The invention is described further hereinafter, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a side view of a disc brake according to the present invention; Figure 2 is a front view of the disc brake of Fig. 1; Figure 3 is a sectional view taken along line Ill-Ill in Fig. 2.
Figure 4 is a sectional view taken along line IV-IV in Fig. 3.
Figure 5 is a sectional view taken along line V-V in Fig. 3, Figure 6 is a plan view of the disc brake of Fig. 1; Figures 7, 8 and 9 are front, side and bottom views, respectively, of a pad spring of the disc brake of Fig. 1; and Figure 10 is a perspective view of the pad spring.
The disc brake shown in the drawings comprises a mounting bracket 1 which has a generally plate-like form and is adapted to be secured to a non-rotatable part of a vehicle such as a chassis of a motor-cycle (not shown) by means of screws (not shown) engaging with threaded bores 1 a. The mounting bracket 1 is disposed on one side (the right side as viewed in Fig. 1) of a disc 2 which is rotatable with a wheel of the vehicle. A pair of pins 3 and 4 are secured to the mounting bracket 1 by suitable means such as force-fitting, welding or the like, and the pins 3 and 4 are spaced from each other in the direction of the circumference of the disc 2.A first end portion 3a, 4a of each of the pins 3 and 4 extends in the direction of the axis of the disc 2 and across the disc 2 thereby straddling a portion of the circumference of the disc 2, and a second end portion 3b, 4b thereof extends in the opposite direction or the rightward direction as viewed in Fig. 1. The mounting bracket 1 and the pins 3 and 4 constitute a supporting member.
A caliper 5 is slidably supported on the second end portions 3b and 4b of the pins 3 and 4. A cylinder 6 is formed in a leg portion 5a of the caliper 5 so as to open toward the disc 2 for slidably and liquid-tightly receiving therein a piston 8 which is adapted to press against the disc 2 a first friction pad 7 as will hereinafter be explained in detail.
The caliper has another leg portion 5b which straddles the disc 2 and extends to the rear side (the left side as viewed in Fig. 1) of a second friction pad 9 for pressing it against the disc 2. The sliding portions between the pins 3 and 4 and bores 5d formed in the caliper 5 for slidably receiving the pins are protected by boots 10, and the sliding portion between the piston 8 and the cylinder 6 is protected by a boot 11 which prevents the ingress of dust or water. The liquid tightness between the cylinder 6 and the piston 8 is maintained by a seal 1 2 which also acts to retract the piston 8 on releasing the braking action.
A recess 1 3 is formed in the mounting bracket 1 for receiving the first friction pad 7 and/shoulders 14 are formed in the upper portion of the recess 1 3 for slidably mounting thereon correspondingly shaped lugs of the first friction pad 7 as clearly shown in Fig. 4.
Thus, the first friction pad 7 is displaceable in the direction of the axis of the disc 2. A pair of bores 1 5 and 1 6 is formed in the second friction pad 9 for receiving therethrough the first end portions 3a and 4a of the pins 3 and 4. Thus, the friction pad 9 is mounted on the supporting member and is also displaceable in the direction of the axis of the disc 2.
A pad spring 1 7 is disposed between the caliper 5 and the friction pads 7 and 9 for preventing vibrations of the friction pads, the configuration of the pad spring 1 7 being shown in Figs. 7 to 1 0. Namely, the spring 1 7 compries a main body 1 7a, arms 1 7b and 1 7c projecting from opposite sides of the main body 1 7a, first retaining portions 1 7d and 1 7e extending downward, as viewed in Fig. 7, from the tip ends of respective arms 1 7b and 1 7c, and a second retaining portion 1 7f which is formed by bending backwards the tip end of the main body 1 7a as clearly shown in Fig. 8.When the pad spring 1 7 is resiliently disposed between the caliper 5 and the friction pads 7 and 9, the second retaining portion 1 7f is disposed on the rear side of the friction pad 9, the arms 1 7b and 1 7c are disposed to resiliently engage with the caliper 5, and the main body 1 7a resiliently engages with the upper or radially outer surface of the friction pads 7 and 9. Furthermore, bent portions 1 7g and 1 7h of the first retaining portions 1 7d and 1 7e are disposed to engage with the right-hand side surface of the mounting bracket 1 as shown in Fig. 1. Thus, the displacement of the friction pad 9 on the pins 3 and 4 in the leftward direction, as viewed in Fig. 1 is controlled so that the friction pad 9 is maintained in its normal operational range.
Further, the arms 1 7b and 1 7c of the pad spring have projections 1 7j for engaging with the axially inner surface Sc of the leg portion 5b.
The disc brake having the construction heretofore described operates as follows.
When oil under pressure is introduced into the cylinder 6, the piston 8 moves leftward as viewed in Fig. 3 and tightly presses the friction pad 7 against one surface of the disc 2.
The caliper 5 guided on the pins 3 and 4 moves rightward as viewed in Fig. 3 according to the reaction force of the piston 8 so that the leg portion 5b of the caliper 5 tightly presses the friction pad 9 against the other surface of the disc 2. Thus, the disc 2 is clamped between the friction pads 7 and 9 and is braked.
The friction pad changing operation will now be described.
In Fig. 1, the friction pad 9 and the caliper 5 are respectively located at the most leftward positions in the normal operational range or in the condition when the friction pads 7 and 9 are new and oil under pressure is not supplied into the cylinder 6. By virtue of the present construction, the caliper 5 can be displaced leftward in the drawing by a distance Ii, and the friction pad 9 can be dismounted from the pins 3 and 4 by displacing the friction pad 9 in the direction away from the disc 2 by a distance 11, and the piston 8 can be displaced rightward, as viewed in Fig. 3, in the cylinder 6 by a distance 13. It is arranged that 11 > 12 and 13 > 12.Therefore, the caliper 5 can be displaced leftward by an amount larger than the distance 12 as viewed in chain lines in Fig.
1, and by disengaging the retaining portion 1 7f of the pad spring 1 7 by pushing portion 1 7f upward or in the direction of the arrow line in Fig. 3 from the rear side surface or the left side surface of the friction pad 9, the friction pad 9 can easily be displaced in the direction away from the disc 2 by the distance 12, so that the friction pad 9 can be removed from the pins 3 and 4. Thereafter, the caliper 5 is displaced rightward in Fig. 3 and the friction pad 7 is dismounted from the mount ing bracket 1 and through a space formed between the piston 8 and the mounting bracket 1.
The relationship between the distances or displacement values Ii and 12 is necessarily 11 > 12. However, the distance or the displace ment value 13 is not required to be larger than 12. When the distance 13 is not larger than 12, the pad changing operation should be per formed by, firstly, dismounting the disc brake from the vehicle, secondly removing the fric tion pad 7 from the mounting bracket 1 and, thereafter, displacing the caliper 5 and remov ing the friction pad 9. In mounting new friction pads on the disc brake, the procedures are performed in reverse order.
The retaining portion 1 7f and the retaining portions 1 7d and 1 7e may engage respec tively with the friction pad 9 and the bracket 1 in the condition of Fig. 1 or at the most leftward position of the friction pad 9 in the normal operational range but, preferably, there is formed a small clearance between the retaining portion 1 7f and the friction pad 9 or between the mounting bracket 1 and the retaining portions 1 7d and 1 7e of the pad spring 1 7 so as to allow an incidental overtra vel of the friction pad 9 caused by, for example, a momentary deformation of the disc 2 or the like.
Although the present invention has been described in detail with respect to the illus trated embodiment, the invention is not lim ited to the embodiment described and may be I applied to disc brakes of other types such as a disc brake wherein the friction pad 7 is also slidably supported on the pins 3 and 4, a disc brake wherein the supporting member is formed by, for example, casting or the like so as to have a generally inverted U-shaped configuration straddling a portion of the circumference of a disc, and pins are secured to the caliper and slidably received in guide bores formed in the supporting member, or the like.
As described heretofore in detail, in a disc brake in accordance with.the invention, the friction pads can easily be exchanged by displacing the caliper. Furthermore,even though the caliper 5 has been displaced by an amount exceeding the predetermined distance 12, in the condition wherein the disc brake is mounted on a vehicle or in handling or transporting the disc brake, the friction pad 9 is retained on the pins 3 and 4 by means of the pad spring 17, so that the friction pads will not become detached from the disc brake.
Furthermore, the pad spring 1 7 of the present construction acts in a similar manner to the pad spring of the prior art disc brakes, to prevent vibration of the friction pads. Thus, the number of components making up the brake will not increase.

Claims (4)

1. A disc brake comprising a pair of friction pads disposed on opposite sides of a rotatable disc, a supporting member which is adapted to be secured to a non-rotatable part of a vehicle and supports thereon the pair of friction pads so that the pads are slidable on the supporting member in the direction of the axis of the disc, a caliper supported slidably in the direction of the axis of the disc on the supporting member and having a piston for pressing one of the friction pads against one side of the disc and a leg portion engaging the other friction pad for pressing the latter friction pad against the other side of the disc, and a pad spring disposed between the caliper and the pair of friction pads, the arrangement being such that said other friction pad can be dismounted from the supporting member by displacing it in a direction away from the disc by a predetermined amount, said caliper being displaceable by an amount exceeding said predetermined amount in the direction which separates the leg portion of the caliper from the disc, and said pad spring having a first retaining portion which engages the supporting member and a econd retaining portion which is adapted to engage said other friction pad for limiting the displacement thereof within said predetermined amount.
2. A disc brake as claimed in claim 1, wherein the pad spring comprises an elongate main body portion which is arranged to extend in the direction of the axis of the disc for resiliently engaging the friction pads, two arm portions oppositely extending from the main body portion in the direction of the circumference of the disc for resiliently engaging the caliper, first retaining portions extending in the direction of the axis of the disc from respective ones of said arm portions and having respective bent or hook-shaped portions for engaging the supporting member, and a second retaining portion formed on one end of the main body portion and adapted to engage said other friction pad.
3. A disc brake as claimed in claim 1 or 2, wherein the supporting member comprises a plate-like mounting bracket disposed along one side of the disc, and having two pins secured thereto and extending in the direction of the axis of the disc.
4. A disc brake substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB7913704A 1979-04-19 1979-04-19 Disc brake Withdrawn GB2048402A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7913704A GB2048402A (en) 1979-04-19 1979-04-19 Disc brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7913704A GB2048402A (en) 1979-04-19 1979-04-19 Disc brake

Publications (1)

Publication Number Publication Date
GB2048402A true GB2048402A (en) 1980-12-10

Family

ID=10504657

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913704A Withdrawn GB2048402A (en) 1979-04-19 1979-04-19 Disc brake

Country Status (1)

Country Link
GB (1) GB2048402A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127116A (en) * 1982-03-11 1984-04-04 Automotive Products Plc Friction pad assembly for disc brakes
FR2563595A1 (en) * 1984-04-26 1985-10-31 Dba SLIDING CALIPER DISC BRAKE SPRING, AND DISC BRAKE PROVIDED WITH SUCH A SPRING
DE3419523A1 (en) * 1984-05-25 1985-11-28 Alfred Teves Gmbh, 6000 Frankfurt SPREADING SPRING FOR A FLOATING OR FOOT SADDLE PARTIAL DISC BRAKE, ESPECIALLY FOR MOTOR VEHICLES

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127116A (en) * 1982-03-11 1984-04-04 Automotive Products Plc Friction pad assembly for disc brakes
FR2563595A1 (en) * 1984-04-26 1985-10-31 Dba SLIDING CALIPER DISC BRAKE SPRING, AND DISC BRAKE PROVIDED WITH SUCH A SPRING
EP0162744A1 (en) * 1984-04-26 1985-11-27 BENDIX France Pad spring for a floating caliper disc brake, and disc brake equipped with such a spring
DE3419523A1 (en) * 1984-05-25 1985-11-28 Alfred Teves Gmbh, 6000 Frankfurt SPREADING SPRING FOR A FLOATING OR FOOT SADDLE PARTIAL DISC BRAKE, ESPECIALLY FOR MOTOR VEHICLES

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)