GB2225070A - Disc brakes and method of coating sliding surfaces thereof - Google Patents

Disc brakes and method of coating sliding surfaces thereof Download PDF

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Publication number
GB2225070A
GB2225070A GB8925509A GB8925509A GB2225070A GB 2225070 A GB2225070 A GB 2225070A GB 8925509 A GB8925509 A GB 8925509A GB 8925509 A GB8925509 A GB 8925509A GB 2225070 A GB2225070 A GB 2225070A
Authority
GB
United Kingdom
Prior art keywords
brake
pin
sliding guide
sliding
piston
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
GB8925509A
Other versions
GB8925509D0 (en
GB2225070B (en
Inventor
Rudolf Thiel
Andreas Doell
George Halasy-Wimmer
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.)
Continental Teves AG and Co oHG
Original Assignee
Alfred Teves GmbH
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 Alfred Teves GmbH filed Critical Alfred Teves GmbH
Publication of GB8925509D0 publication Critical patent/GB8925509D0/en
Publication of GB2225070A publication Critical patent/GB2225070A/en
Application granted granted Critical
Publication of GB2225070B publication Critical patent/GB2225070B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/06—Pistons

Landscapes

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

Description

/- D U 1 U R.Thiel 56-15-6 1 SLIDING GUIDE, IN PARTICULAR FOR HYDRAULIC
DISC BRAKES, AND METHOD FOR COATING IT The present invention relates to a sliding guide, and in particular a sliding guide for hydraulic disc brakes, having an associated brake caliper arranged for engagement around a brake disc and brakes shoes and mounted to a brake carrier, the brake caliper being provided with at least one piston and/or pin guided in associated bores and, additionally, a method for manufacturing such sliding guides.
A guide system of the abovementioned type is, for instance, shown in the printed and published German patent application 2211453. with this floating caliper spot-type disc brake, brake pads are arranged in the caliper on both sides of the brake disc, engaging around the brake disc, which brake pads are pressed against the brake disc due to an axial sliding movement of the piston in the brake caliper, the brake caliper being slidingly displaced relative to the brake carrier via a pin guide. 20 In a design of the abovementioned type wherein the forces which are being generated during the actuation of the piston are, substantially, absorbed by a supporting pin, signs of wear on the guiding surfaces within the area of the pin guides and signs of heating on the piston during longterm operation may lead to a functional failure of the brake system. It is, therefore, the object of the present invention to 2 improve the known sliding guide in a manner so that even during longer phases of brake actuation, a damage to the guide surfaces and an overheating of the piston will be substantially alleviated.
According to the present invention, there is provided a sliding guide, in particular for hydraulic spot-type disc brakes, with an associated brake caliper which, engages around a brake disc and brake shoes and is mounted to a brake carrier, the brake caliper being provided with at least one piston and/or pin guided in associated bores, wherein the piston and/or pin which is slidingly moved in a translatory manner is equipped with nonmetallic nonorganic materials in the sliding surfaces.
The present invention also provides a method for coating sliding guides, in particular for hydraulic spot-type disc brakes, with an associated brake caliper which engages around a brake disc and brake shoes and is mounted to a brake carrier the brake caliper being provided with at least one piston and/or pin guided in associated bores of the 1.0 brake caliper and the brake carrier, wherein a nonmetallic nonorganic material is, in a defined layer thickness, applied onto surfaces, in particular onto slidingly moved parts, by means of plasma spraying.
The present invention thus enables the provision of a -15 tightly toleranced piston and/or pin guidance with optimised sliding effect which enables the system to be maintained within the total operating temperature range.
In order to meet its functional requirements, that is, to guide the caliper and to transmit the hydraulic pressures in the brake caliper onto the piston, the sliding guide has, corresponding to the caliper design, a very low coefficient of f riction. In addition, the formation of frictional corrosion will be substantially eliminated by means of the piston and pin coating according to the invention so that the guides of the piston and pin will remain operative even after very long periods of use. Further advantages of the ceramic coating of the piston include the excellent heat 3 1 insulation and wear resistance due to the high surface hardness. Furthermore the total elimination of lubricants together with the combination of a ceramically coated pin and a ceramically coated guide and/or bushing is also 5 advantageous.
The present invention will now be described by way of example only with reference to the accompanying drawings in which Figure 1 shows a partial section of a brake caliper of a spot-type disc brake; Figure 2 shows a sectional view in the mounting and the guiding plane of the pin between brake caliper and brake carrier with integral ceramic bushing; Figure 3 shows a sectional view in the mounting and the ceramically coated guiding plane of the pin between brake caliper and brake carrier.
Figure 1 shows a partial section through a brake caliper 6, which usually is of cast material, the cast brake caliper 6 having a substantially clamp-like shape so that the brake caliper 6 engages with a first, radially running limb 11, via a bridge part 12, and a brake cylinder housing 13 around a brake disc which is not illustrated in Figure 1. in the brake cylinder housing 13, a piston 1 having a ceramic coating 3, is radially guided and sealingly protected against hydraulic fluid losses due to a gap and external deposits of dirt by means of, respectively, a profiled rubber seal 14 and a protecting cap 15 located in two circumferential internal grooves of the brake cylinder housing 13 which radially engage around a shaft portion of the piston 1. In addition to the ceramic coating 3 of the piston 1, a ceramic coating of the wall in a hollow space 7 of the brake cylinder can be carried out. The ceramic coating 3 of the piston is, preferably, only a fraction of the layer thickness within the hollow space 7 and at an annular shoulder 8 of the piston 1.
By this means, good sliding properties as well as a substantial elimination of corrosion and a considerable 4 reduction of the heat transmission to the adjacent surfaces will be achieved due to low friction coefficients. Arranged parallel to the axis of symmetry of the piston 1, a limbshaped pin housing 16 is provided being an integral component of the brake caliper 6, with a bore, which is not illustrated in Figure 1, to accommodate a pin 2, which extends in a spatial arrangement so that the. pin 2, protected by means of a rubber cup 17, is axially and slidingly arranged in a brake carrier 5. A mounting bore 18 illustrated in the sectional view of the brake caliper 5 serves to accommodate a holding screw of the wheel suspension of the motor vehicle. Underneath the housing for the accommodation of the pin 2 in the brake caliper 6, the partial view shows a damping sleeve 19 which is held in the brake caliper 6 by means of a shoulder each on both sides of the associated end face of a housing bore and serves to accommodate a guiding pin which is axially displaceable therein.
Figure 2 shows, in part, the pin housing 16 having a limb-like shape similar to the brake caliper 6, and a bore 4 of the brake carrier 5 in an axial longitudinal section to the sliding plane. The pin 2, inserted in the pin housing 16 of the brake caliper 6, is axially and slidingly guided in the housing with a ceramically coated shaft portion 10 in an integral ceramic bushing 9 of the brake carrier 5. The application of ceramic materials in the guide of the pin 2, which guide is susceptible to wear, ensures optimal measures regarding; the sliding behaviour between the two parts and the protection against corrosion. For weight reduction purposes, the pin 2 in the brake carrier 5 has been designed as a sleeve. The shaft portion of the pin 2 may only be partially coated with the ceramic material, the coating extending over a defined length. In order to protect the space between the brake caliper 6 and the brake carrier 5 against contaminations, circumferential groove 20 is provided in the brake caliper 6 and the end f ace of the brake carrier 5 includes a rubber cup 17 so that the bare shaf t of the pin is protected in the interspace between the brake caliper 6 and the brake carrier 5.
Figure 3 shows, in a meridian section, the partly illustrated limb of the brake caliper 6 and the brake carrier 5 with the ceramically coated pin 2 accommodated in the cylindrical bore 4 of the brake carrier arm, the open ends of the rubber cup 17 being, similar to Figure 2, mounted around the pin 2 between brake caliper 6 and brake carrier 5 in two circumferentially running grooves 20 of the brake caliper 6 and the brake carrier 5, the introduction of dirt and humidity into the interspace thus being prevented. For weight reduction purposes, the pin 2 in the brake carrier 5 has a sleeve-like design. Instead of the integral bushing 9 of the brake carrier 5, as shown in Figure 2, the arrangement illustrated in Figure 3 has a ceramic coating 3 in the bore 4 of the brake carrier 5.
The method for coating sliding guides provides that the ceramic material is applied onto the surfaces of the pin 2 and the piston 1, said surfaces being moved towards each other in a substantially translatory manner, as well as onto the bore 4 associated with the brake carrier 5, by means of plasma spraying in defined thicknesses, depending on the processing operations following thereto.
6

Claims (15)

CLAIMS:
1. sliding guide, in particular for hydraulic spot-type disc brakes, with an associated brake caliper which engages around a brake disc and brake shoes and is mounted to a brake carrier. the brake caliper being provided with at least one piston and/or pin guided in associated bores, wherein the piston and/or pin which is slidingly moyed in a translatory manner is equipped with nonmetallic nonorganic materials in the sliding surfaces.
2. Sliding guide according to claim 1, wherein at least that pin which absorbs the main forces during braking is provided with a coating.
3. Sliding guide according to claim 1 or 2, wherein at least that bore in the brake carrier whose associated pin substantially absorbs the main forces during braking is provided with a coating.
4. Sliding guide according to any one of claims 1 to 3, wherein the piston in the brake caliper is provided with a coating which is substantially composed of a ceramic or enamellar material, the ceramic layer thickness on the sliding surfaces of the piston amounting only to a fraction of the layer thickness within the hollow space and at the annular shoulder of the piston.
5. Sliding guide according to any one of the claims 1 to 4, wherein the coating of the pin and the bore is composed of a ceramic or enamellar material.
6. Sliding guide according to claim 1, wherein the sliding surface of the pin in the brake carrier comprises a bushing containing ceramic materials.
7. Sliding guide according to claim 6, wherein the bushing substantially containing ceramic materials is at least nonpositively held in the brake carrier.
S. Sliding guide according to claim 6 or claim 7, wherein the bushing substantially containing ceramic materials forms an integral part of the brake carrier.
9. Sliding guide according to any one of claims 6 to 8, wherein the bushing substantially containing ceramic z a 7 materials cooperates with the pin equipped with nonmetallic nonorganic materials in the sliding surfaces.
10. Sliding guide according to any one of the preceding claims, wherein a shaft portion of the pin is partially coated with the nonmetallic nonorganic material over a defined length.
11. Sliding guide according to claim 10, wherein the shaft portion of the pin in the brake carrier has the geometry of a hollow cylinder.
12. Sliding guide substantially as hereinbefore described with reference to the accompanying drawings.
13. Method for coating sliding guides, in particular for hydraulic spottype disc brakes, with an associated brake caliper which engages around a brake disc and brake shoes and is mounted to a brake carrier, the brake caliper being provided with at least one piston and/or pin guided in associated bores of the brake caliper and the brake carrier, in particular according to any one of the preceding claims, wherein a nonmetallic nonorganic material is, in a defined layer thickness, applied onto surfaces, in particular onto slidingly moved parts, by means of plasma spraying.
14. A method according to claim 13, wherein the nonmetallic nonorganic material comprises a ceramic or enamellar material.
15. A method for coating sliding guides substantially as hereinbefore described with reference to the accompanying drawings.
Published 1990 at, The Patent Office-State House. 6C 71 High Holbcrr, LendcnWClR4TP-Furthe-cc)plesmkvbe obtained from The Patent Office Sales Branc!, St, Ma7'Crk; Orpng,-r. Kent, ER5 3RE Printe4- ty Multiplex techniques ltd S-, Mary Cray. Kent. Con 1'87
GB8925509A 1988-11-12 1989-11-10 Disc brakes Expired - Lifetime GB2225070B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3838438A DE3838438A1 (en) 1988-11-12 1988-11-12 SLIDING GUIDE, ESPECIALLY FOR HYDRAULIC DISC BRAKES AND METHOD FOR COATING THEM

Publications (3)

Publication Number Publication Date
GB8925509D0 GB8925509D0 (en) 1989-12-28
GB2225070A true GB2225070A (en) 1990-05-23
GB2225070B GB2225070B (en) 1992-12-16

Family

ID=6367066

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8925509A Expired - Lifetime GB2225070B (en) 1988-11-12 1989-11-10 Disc brakes

Country Status (5)

Country Link
DE (1) DE3838438A1 (en)
ES (1) ES2015471A6 (en)
FR (1) FR2639076B1 (en)
GB (1) GB2225070B (en)
IT (1) IT1236765B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566009A1 (en) * 1992-04-13 1993-10-20 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Air operated disc brake
WO1998027354A1 (en) * 1996-12-19 1998-06-25 Continental Teves Ag & Co. Ohg Bolt guide for the floating calliper of a partially lined disc brake

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106700A1 (en) * 1990-11-17 1992-05-21 Ruetgers Pagid Ag Vibration attenuating metallic support plates - made by plasma spraying thin coating of aluminium oxide or chromium oxide ceramic
DE102014202135B4 (en) * 2014-02-06 2023-12-14 Ford Global Technologies, Llc Method for coating a bore, cylinder lining and cylinder block of an internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255079A (en) * 1968-06-20 1971-11-24 Dayton Steel Foundry Co Disk brakes
DE2246390A1 (en) * 1972-09-21 1974-03-28 Teves Gmbh Alfred Piston and cylinder lip seal - with a film of carbon, graphite or bronze filled PTFE vulcanised onto it
US4327820A (en) * 1979-12-06 1982-05-04 Toyota Jidosha Kogyo Kabushiki Kaisha Disc brake and method of manufacturing the same
GB2151728A (en) * 1983-12-23 1985-07-24 Teves Gmbh Alfred Floating caliper spot-type disc brake
US4858516A (en) * 1983-06-29 1989-08-22 Alfred Teves Gmbh Brake cylinder-piston slave unit seal having radial roll-back protrusion for piston spring back retract

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037828A (en) * 1959-08-17 1962-06-05 Harold J Michael Bearing and method of bearing manufacture
DE1959393U (en) * 1966-08-05 1967-04-27 Teves Kg Alfred PISTON IN THE SLAVE CYLINDER OF PRESSURE-ACTUATED BRAKES.
GB1381709A (en) * 1971-03-09 1975-01-22 Girling Ltd Sliding caliper disc brakes
CH633868A5 (en) * 1977-09-07 1982-12-31 Alusuisse WEAR-RESISTANT COATING OF THE WORK SURFACE OF DISC-SHAPED MACHINE PARTS MADE OF ALUMINUM OR ALUMINUM ALLOYS.
DE2748824C3 (en) * 1977-10-31 1985-07-18 Hermann Dr.-Ing. 7412 Eningen Klaue Air-cooled full-lined disc brake
US4331221A (en) * 1978-08-01 1982-05-25 Kelsey-Hayes Co. Caliper disc brake guide and retention means
JPS58163820A (en) * 1982-03-19 1983-09-28 Daido Steel Co Ltd Slide member
JPS5980536A (en) * 1982-10-29 1984-05-10 Akebono Brake Ind Co Ltd Piston for disc brake
DE3323361A1 (en) * 1983-06-29 1985-04-04 Alfred Teves Gmbh, 6000 Frankfurt Piston-cylinder arrangement for brakes
JPS6145120A (en) * 1984-08-07 1986-03-05 Nissin Kogyo Kk Disc brake device for car
US4665637A (en) * 1985-07-26 1987-05-19 Braun Aktiengesellschaft Sole plate coating for a fabric pressing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255079A (en) * 1968-06-20 1971-11-24 Dayton Steel Foundry Co Disk brakes
DE2246390A1 (en) * 1972-09-21 1974-03-28 Teves Gmbh Alfred Piston and cylinder lip seal - with a film of carbon, graphite or bronze filled PTFE vulcanised onto it
US4327820A (en) * 1979-12-06 1982-05-04 Toyota Jidosha Kogyo Kabushiki Kaisha Disc brake and method of manufacturing the same
US4858516A (en) * 1983-06-29 1989-08-22 Alfred Teves Gmbh Brake cylinder-piston slave unit seal having radial roll-back protrusion for piston spring back retract
GB2151728A (en) * 1983-12-23 1985-07-24 Teves Gmbh Alfred Floating caliper spot-type disc brake

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566009A1 (en) * 1992-04-13 1993-10-20 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Air operated disc brake
WO1998027354A1 (en) * 1996-12-19 1998-06-25 Continental Teves Ag & Co. Ohg Bolt guide for the floating calliper of a partially lined disc brake

Also Published As

Publication number Publication date
IT8922152A1 (en) 1991-04-26
DE3838438A1 (en) 1990-05-17
IT1236765B (en) 1993-04-02
ES2015471A6 (en) 1990-08-16
FR2639076B1 (en) 1995-07-07
FR2639076A1 (en) 1990-05-18
GB8925509D0 (en) 1989-12-28
IT8922152A0 (en) 1989-10-26
GB2225070B (en) 1992-12-16

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Legal Events

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

Effective date: 19951110