GB1563817A - Disc brakes - Google Patents

Disc brakes Download PDF

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Publication number
GB1563817A
GB1563817A GB3374276A GB3374276A GB1563817A GB 1563817 A GB1563817 A GB 1563817A GB 3374276 A GB3374276 A GB 3374276A GB 3374276 A GB3374276 A GB 3374276A GB 1563817 A GB1563817 A GB 1563817A
Authority
GB
United Kingdom
Prior art keywords
disc
support member
arms
pins
caliper
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
GB3374276A
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 GB1563817A publication Critical patent/GB1563817A/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
    • 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
    • F16D2055/0016—Brake calipers
    • F16D2055/002—Brake calipers assembled from a plurality of parts
    • 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

Description

(54) INIPROEMENTS IN AND RELATING TO DISC BRAKES (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: This invention relates to disc brakes and in particular to disc brakes of the floating caliper type.
A typical known floating type disc brake comprises a rotary disc, a support member adapted to be secured to a stationary part of a vehicle and including a pair of arms which are spaced apart in the circumferential direction of the disc, a caliper member slidably supported in relation to ilic support member by means of two parallel pins whose axes are parallel to the rotary axis of the disc and which are carried by the caliper member and are slidably received in guide bores formed in the two arms of the support member, respectively, a first friction pad assembly disposed on one side of the disc and carried by the support member whereby, upon braking, the braking force on the first friction pad assembly is transmitted directly to one of said support member arms, and a second friction pad assembly disposed on the other side of the disc and supported by the caliper member. In the known brakes, the arrangement is usual such that, upon braking, the braking force on the second friction pad assembly is transmitted substantially evenly to both support member arms via the caliper member and said pins.
Thus a substantial portion of the brake force is transmitted by said one of the support member arms, the result of which is that at least the portion of the support member defining said one arm has to b made relatively massive so that the support member is correspondingly heavy.
It is an objective of the present invention to enable the braking force to be more evenly distributed between the arms of the support member and hence enable the support member to be less massive and so be correspondingly lighter.
In accordance with the present invention a floating caliper-type disc brake comprises a rotary disc, a support member adapted to be secured to a stationary part of a vehicle and including a pair of arms which are spaced apart in the circumferential direction of the disc, a caliper member slidably supported in relation to the support member by means of two pins whoses axes are parallel to the rotary axis of the disc and which are carried by the caliper member and are slidably received in guide bores formed in the two arms of the support member, respectively, a first friction pad assembly disposed on one side of the disc and carried by the support member whereby, upon braking, the braking force on the first friction pad assembly is transmitted directly to one of said support member arms, and a second friction pad assembly disposed on the other side of the disc and supported by the caliper member, the spacing between the axes of said pins being less than the spacing between the axes of said guide bores and said pins being of smaller diameter than said guide bores respectively such that, upon braking, the braking force on the second friction pad assembly is transmitted to the other of said support member arms via the caliper member and the corresponding one of said pins only.
The invention is described further hereinafter, by way of example with reference to the accompanying drawings, in which :- Fig. 1 is a top plan view of one preferred embodiment of a floating caliper-type disc brake constructed in accordance with the present invention showing a portion of the brake in section; and Fig. 2 is a side elevational view in partial section taken substantially along the line 11-IT of Fig 1.
The basic operational principle of the present disc brake is substantially the same as that of the prior art disc brakes. That is, when the brake is applied, a metered amount of oil under pressure is supplie from a suitable oil supply source (not shown) through an oil inlet hole 16, formed in the upper portion of the housing or caliper member 1, into a cylinder 17 defined in the housing and in communication with the oil inlet hole, whereupon the pressure of the oil moves a piston 2. slidably received in the cylinder 17, in the direction of arrow 18 towards one side of a brake disc (not shown).
When the piston 2 is moved in the direction of arrow 18 under oil pressure as described above, a reaction force is generated by the oi ! pressure in response to the movement of the piston to thereby bodily move the housing I in the direction opposite to the direction of arrow 18 by virtue of the fact that slide pins 13 in the form of bolts slidably move within holes 20 formed in a support 9 as will be described in detail hereinafter, the axes of the pins being parallel to the rotary axis of the disc. In this way, the disc is engaged on one surface by a friction pad or pad assembly 11 which is directly operated by the piston 2 and guided between arms 7,8 on the support 9 and engaged on the other surface by a second friction pad or pad assembly 12 held in position on the housing 1 by means of a suitable conventional means.
The friction pads 11, 1 2 are slidably mounted on two pins 14 which are in turn supported in ribs 23 on the housing I. The arms 7,8 are spaced apart in the circumferential direction of the disc.
Furthermore, as is well known in the art, the housing I is mounted on the slide bolts or pins 13 extending slidably through respective guide bores in the form of holes 20 formed in the arms 7,8 on the support 9 which is secured to a stationary part of a vehicie (not shown) by way of mounting holes 19 formed in the support, the opposite ends of the slide pins being fixedly received in aligned holes 3,4 in the housing I whereby the housing I is slidably movable relative to the support 9.
In the illustrated disc brake, the axes of the pins 13 carried by the housing I are somewhat offset with respect to the axes of the holes 20 in the support 9, respectively.
That : s, the axes of the pin guide holes 50, in the support 9 are positioned slightly outwardly of the axes of the pins 13, respectively, the diameters of which pins are slightly smaller than those of the holes 0.
Thus, the distance between the axes of the holes 20 in the support 9 is greater than that between the axes of the pins 13 carried by the housing I. The amount of eccentricity of the axis of each of the pins 13 with respect to the axis of the respectively associated one of the holes 20 is a function of the diameters of the holes 20 and pins 13. To put it in more detail, as shown in Fig. 2, when the shank portions of the pins 13 are slidably inserted in the respectively associated holes 20 in the support 9 and the end of the pins are snugly fitted in the holes 3,4 in the housing 1, respectively, the inner side face of each of the pins 13 makes contact with the opposed or inner side face of the associated hole 20.
With the above-mentioned construction and arrangement of the components, the following operative advantages can be obtained. Referring to Fig. 2 particularlv, when the disc brake is applied in the manner described hereinabove, on the assumption that the disc is rotating in the direction of arrow 5, a braking force from the friction pad 11 which directly acts on the support 9 is applied in the direction of arrow 6, that is the pad 11 and more particularly, the backing plate on the pad moves toward the right-hand arm 7 on the support 9 until the right-hand edge of the backing plate edge abuts against the lefthand edge of the arm 7. On the other hand, a braking force from the second friction pad 12, which is adapted to move in the axial direction of the disc together with the housing 1, is also applied in the direction of arrow 6. However, since the friction pad 12 is held in position on the housing 1, it is necessary that the braking force from the pad 12 in the direction of arrow 5 be first transmitted to the housing I and then be transmitted to the support 9 through the right-hand or left-hand pin 13 and arm 7 or 8. In this case, if the braking force takes the course of housing I-right-hand pin ! 3 -arm 7-support 9, as is clear from Fig. 2- since the right-hand side face of the righthand pin 13 is not in contact with the righthand side face of the associated hole 20, no force transfer is effected between the pin 13 and hole 20 under consideration. On the other hand, if the braking force takes the course of housing I-left-hand pin 13-arm 8-support 9, since the right-hand side face of the pin 13 is in contact with the righthand or inner face of the associated hole 20, the braking force is transmitted to the support 9 and finally to the vehicle (not shown). Thus, the braking force of tthe friction pad 12 is transmitted to the left-hand arm 8 as distinguished from the transmission mode of the braking force of the friction pad 11. When the disc is rotating in the direction opposite to the direction of arrow 5, it will be easily understood that the braking forces from the friction pads 11, l2 are transmitted to the left-hand and right-hand arms 8 and 7, respectively by reversing the transmission courses as described hereinabove.
Thus, one half of the total braking force is applied to each of the arms 7 and 8, respectively to thereby reduce the individual loads on the arms 7,8 as compared with the corresponding parts of the prior art floating caliper-type disc brakes. Furthermore, since the base of the support 9 which connects the arms 7,8 of the support has a calculated bending moment of zero, the amount of material necessary to form this base can be substantially reduced.
In the prior art disc brakes wherein the support 9 is not provided with holes 20 which loosely receive the pins 13, when the disc is rotating in the direction of arrow 5, for example, a braking force from the friction pad 11 would be, of course, applied to the right-hand arm 7 and in addition, about one half of the braking force from the friction pad 12 would be applied to the right-hand arm 7 through the right-hand pin 13 whereby about 75 h of the whole braking force would be applied to the right-hand arm 7. In contrast, in the illustrated disc brake in accordance with the invention, 50% of the whole braking force is applied to each of the arms 7,8, respectively which enables substantial design differences between the present invention and prior art to be made. In the case of the base 10 of the support 9 which connects the arms 7 and 8 together, in the prior art disc brake, assuming that the rightward moment about the right-hand fulcrum 19 of the support 9 is 75 L kg-m (L: moment arm), the leftward miment about the left-hand fulcrum 19 is 25 L kg-m and an upward force of 50 L kg-m is still acting on the base 10 of the support 9. On the other hand, in the illustrated disc brake of the present invention, the moment is 50 L kg-m both about the right-hand and left-hand fulcrums, respectively and no upward force is acting on the base 10 of the support 9.
Thus, the base 10 can be at reduced size and weight.

Claims (3)

Reference is hereby directed to our copending Application No. 7914453 serial No. 1563818 which describes and claims a floating caliper-type disc brake comprising a rotary disc, a support member adapted to be secured to a stationary part of a vehicle and including a pair of arms which are spaced apart in the circumferential direction of the disc, a caliper member slidably supported in relation to the support member by means of two pins whose axes are parallel to the rotary axis of the disc and which are carried by the caliper member and are slidably received in guide bores formed in the two arms of the support member, respectively, a first friction pad assembly disposed on one side of the disc and carried by the support member whereby, upon braking, the braking force on the first friction pad assembly is transmitted directly to one of said support member arms, and a second friction pad assembly disposed on the other side of the disc and supported by the caliper member, the pins being slidably received with clearance in said guide bores but being engageable directly with the respective bores, and the clearance between the pin and the associated guide bore in said one of the support member arms being greater than the clearance between the pin and the associated guide bore in the other of said support member arms whereby, upon braking, the braking force on the second friction pad assembly is transmitted to said other of said support member arms via the caliper member and the corresponding one of said pins only. WHAT WE CLAIM IS :-
1. A floating caliper-type disc brake comprising a rotary disc, a support member adapted to be secured to a stationary part of a vehicle and including a pair of arms which are spaced apart in the circumferential direction of the disc, a caliper member slidably supported in relation to the support member by means of two pins whose axes are parallel to the rotary axis of the disc and which are carried by the caliper member and are slidably received in guide bores formed in the two arms of the support member, respectively, a first friction pad assembly disposed on one side of the disc and carried by the support member whereby, upon braking, the braking force on the first friction pad assembly is transmitted directly to one of said support member arms, and a second friction pad assembly disposed on the other side of the disc and suppored by the caliper member, the spacing between the axes of said pins being less than the spacing between the axes of said guide bores and said pins being of smaller diameter than said guide bores respectively such that, upon braking, the braking force on the second friction pad assembly is transmitted to the other of said support member arms via the caliper member and the corresponding one of said pins only.
2. A disc brake as claimed in claim I in which the pins are in the form of bolts whose two ends are rigidly secured to the caliper member and whose intermediate shank portions are slidably received in said guide bores.
3. A disc brake substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB3374276A 1975-08-14 1976-08-13 Disc brakes Expired GB1563817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50098823A JPS5222660A (en) 1975-08-14 1975-08-14 Disc brake

Publications (1)

Publication Number Publication Date
GB1563817A true GB1563817A (en) 1980-04-02

Family

ID=14230010

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1445379A Expired GB1563818A (en) 1975-08-14 1976-08-13 Disc brakes
GB3374276A Expired GB1563817A (en) 1975-08-14 1976-08-13 Disc brakes

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1445379A Expired GB1563818A (en) 1975-08-14 1976-08-13 Disc brakes

Country Status (2)

Country Link
JP (1) JPS5222660A (en)
GB (2) GB1563818A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541743B1 (en) * 1983-02-25 1987-09-18 Dba SLIDING CALIPER DISC BRAKE
JPH09250572A (en) * 1996-03-15 1997-09-22 Akebono Brake Ind Co Ltd Disc brake
DE10242102A1 (en) * 2002-09-11 2004-03-25 Continental Teves Ag & Co. Ohg Method for fitting guide shafts to disc brake housing has one end of each shaft threaded with the same diameter as the remainder of the shaft and with a profiled end to secure into a shaped threaded hole in the brake housing

Also Published As

Publication number Publication date
GB1563818A (en) 1980-04-02
JPS5222660A (en) 1977-02-21

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Legal Events

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