GB1582601A - Disc brake - Google Patents

Disc brake Download PDF

Info

Publication number
GB1582601A
GB1582601A GB2304877A GB2304877A GB1582601A GB 1582601 A GB1582601 A GB 1582601A GB 2304877 A GB2304877 A GB 2304877A GB 2304877 A GB2304877 A GB 2304877A GB 1582601 A GB1582601 A GB 1582601A
Authority
GB
United Kingdom
Prior art keywords
brake
piston
stepped
disc
stepped 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.)
Expired
Application number
GB2304877A
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.)
KNORR BREMSE GmbH
Knorr Bremse AG
Original Assignee
KNORR BREMSE GmbH
Knorr Bremse AG
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 KNORR BREMSE GmbH, Knorr Bremse AG filed Critical KNORR BREMSE GmbH
Publication of GB1582601A publication Critical patent/GB1582601A/en
Expired 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
    • 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
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure

Landscapes

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

Description

(54) DISC BRAKE (71) We, KNORR-BREMSE GmbH., Moosacher Strasse 80, D-8000 Munchen 40, Federal Republic of Germany, and a German company, 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 a disc brake operable by pressure medium and comprising a brake disc, a braking cylinder cooperable with the brake disc and having an axis extending parallel to the axis of the brake disc, and a piston slidable in said cylinder for movement towards and away from said brake disc.
According to the invention there is provided a disc brake operable by pressure medium and comprising: a brake disc; a stepped brake cylinder cooperable with the brake disc and having an axis extending parallel to the axis of the brake disc, said stepped cylinder comprising first and second portions positioned respectively near to and remote from said brake disc and said second portion being smaller in diameter than said first portion; a stepped piston slidable in said cylinder for movement towards and away from said brake disc and having first and second portions slidably received in said first and second portions of the cylinder respectively to define therewith respective first and second pressure chambers to which pressure medium is supplied in use to operate the disc brake, said first and second pressure chambers being in fluid communication with each other; and a single seal provided for the stepped piston and arranged to seal only the sliding movement of the first portion of the stepped piston.
One embodiment of disc brake according to the invention will now be described in detail, by way of example only, with reference to the accompanying diagrammatic drawing.
A braking cylinder 2 is connected via flange eyelets 1, preferably with the brake saddle or caliper of a disc brake (not shown), and is designed as a stepped cylinder comprising a first portion 3 which faces the brake disc and has a large diameter, and a second portion 4 which is remote from the brake disc and has a smaller diameter. Formed in the end of the portion 4 is an aperture 5 to which a brake line is to be attached.
Guided in the stepped cylinder 2 is a stepped piston 6 which, to correspond to the stepped cylinder 2, has a righthand portion 7 of smaller diameter and a left-hand portion 8 of larger diameter.
From the portion 8 there projects towards the left a projection 9 with which the stepped piston 6 is able to press against a brake shoe or pad (not shown) of the disc brake. The stepped piston 6 is formed with a longitudinal groove 10 extending throughout its entire zone of smaller diameter, i.e. from the portion 7 as far as the portion 8 and which provides fluid communication between a pressure chamber 11 of small diameter and a pressure chamber 12 of larger diameter.
The piston portion 8 of larger diameter has its sliding movement in the cylinder portion 3 sealed by means of a piston packing 13 (which comprises a single seal for the stepped piston 6). In the zone between its two faces delimiting the pressure chambers 11 and 12, there is mounted on the stepped piston 6 a clamping ring 14 which is displaceable only on overcoming a pre-determined degree of friction and which is retained for limiting axial displacement in the stepped cylinder 2 between the point of transition thereof from the wider cylinder portion 3 to the longer cylinder portion 4 and a ring 15 retained in the cylinder portion 3.
If pressure medium is fed to the stepped cylinder via the connection 5, the pressure medium acts on the piston portion 7 of smaller diameter and, through the longitudinal groove 10 and via the chamber 12, also on the portion 8 of larger diameter of the stepped piston. Thus, the stepped piston 6 is pushed with great force towards the left and actuates the disc brake. The relatively axially far apart portions 7 and 8 of the stepped piston 6 are meanwhile guided in the stepped cylinder 2, so that the stepped piston 6 has a substantial guiding length which opposes any tendency of the piston to tilt which might possibly result in jamming. The clamping ring 14 operates in known manner (which is therefore not described) as a return-stroke delimit ing means for the stepped piston 6 in order to compensate for wear of the disc brake linings during brake release.
However, it is possible to provide also any desired other known resetting device.
As will be seen from the drawing, the portion 7 of the stepped piston 6 has a considerably greater axial extent that the axial extent of the portion 8, so as to provide good guidance for the move ment of the stepped piston as a whole, whereas the larger diameter of the portion 8 ensures that the major part of the braking force provided by the stepped piston as a whole is derived from the (axially shorter) portion 8. Since fluid communication is provided between the pressure chambers 11 and 12 via the groove 10 in the second portion 7 of the stepped piston, there is no necessity to provide a seal for the movement of the second portion 7 so that only the first portion 8 of the stepped piston requires a seal (packing 13).
WHAT WE CLAIM IS: 1. A disc brake operable by pressure medium and comprising: a brake disc a stepped brake cylinder cooperable with the brake disc and having an axis extending parallel to the axis of the brake disc, said stepped cylinder comprising first and second portions positioned respectively near to and remote from said brake disc and said second portion being smaller in diameter than said first portion; a stepped piston slidable in said cylinder for movement towards and away from said brake disc and having first and second portions slidably received in said first and second portions of the cylinder respectively to define therewith respective first and second pressure cham bers to which pressure medium is supplied in use to operate the disc brake, said first and second pressure chambers being in fluid communication with each other; and a single seal provided for the stepped piston and arranged to seal only the sliding movement of the first portion of the stepped piston.
2. A disc brake according to claim 1, in which said first and second pressure chambers are in fluid communication with each other via a groove formed in said second portion of the stepped piston.
3. A disc brake according to claim 1 or 2, in which said second portion of the stepped piston has a considerably greater axial extent than the axial extent of said first portion of the stepped piston.
4. A disc brake according to any one of the preceding claims, including a brake-wear compensator mounted on said stepped piston for limited movement in said stepped cylinder.
5. A disc brake according to claim 4, in which said brake-wear compensator comprises a clamping ring mounted on said second portion of the stepped piston and moveable therewith during a brakeapplication stroke of the piston, an abutment provided in said cylinder to limit the movement of the clamping ring during said brake-application stroke of the piston, and a shoulder in the cylinder for limiting the return movement of the piston and the clamping ring, the arrangement being such that when brake wear occurs which requires compensation the piston continues to travel towards the brake disc after engagement of the clamping ring with the abutment whereby the ring automatically adjusts its position axially of the piston by an amount corresponding to the extent of brake-wear and thereby correspondingly limits the return movement of the piston when the ring engages said shoulder.
6. A disc brake according to any one of the preceding claims and substantially as hereinbefore described with reference to, and as shown in the accompanying drawing.
7. A disc brake according to any one of the preceding claims and adapted for use on a road vehicle.
8. A road vehicle having independent wheel suspension, and a disc brake according to any one of the preceding claims operatively associated with each wheel of the vehicle.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    force towards the left and actuates the disc brake. The relatively axially far apart portions 7 and 8 of the stepped piston 6 are meanwhile guided in the stepped cylinder 2, so that the stepped piston 6 has a substantial guiding length which opposes any tendency of the piston to tilt which might possibly result in jamming. The clamping ring 14 operates in known manner (which is therefore not described) as a return-stroke delimit ing means for the stepped piston 6 in order to compensate for wear of the disc brake linings during brake release.
    However, it is possible to provide also any desired other known resetting device.
    As will be seen from the drawing, the portion 7 of the stepped piston 6 has a considerably greater axial extent that the axial extent of the portion 8, so as to provide good guidance for the move ment of the stepped piston as a whole, whereas the larger diameter of the portion
    8 ensures that the major part of the braking force provided by the stepped piston as a whole is derived from the (axially shorter) portion 8. Since fluid communication is provided between the pressure chambers 11 and 12 via the groove 10 in the second portion 7 of the stepped piston, there is no necessity to provide a seal for the movement of the second portion 7 so that only the first portion 8 of the stepped piston requires a seal (packing 13).
    WHAT WE CLAIM IS: 1. A disc brake operable by pressure medium and comprising: a brake disc a stepped brake cylinder cooperable with the brake disc and having an axis extending parallel to the axis of the brake disc, said stepped cylinder comprising first and second portions positioned respectively near to and remote from said brake disc and said second portion being smaller in diameter than said first portion; a stepped piston slidable in said cylinder for movement towards and away from said brake disc and having first and second portions slidably received in said first and second portions of the cylinder respectively to define therewith respective first and second pressure cham bers to which pressure medium is supplied in use to operate the disc brake, said first and second pressure chambers being in fluid communication with each other; and a single seal provided for the stepped piston and arranged to seal only the sliding movement of the first portion of the stepped piston.
    2. A disc brake according to claim 1, in which said first and second pressure chambers are in fluid communication with each other via a groove formed in said second portion of the stepped piston.
    3. A disc brake according to claim 1 or 2, in which said second portion of the stepped piston has a considerably greater axial extent than the axial extent of said first portion of the stepped piston.
    4. A disc brake according to any one of the preceding claims, including a brake-wear compensator mounted on said stepped piston for limited movement in said stepped cylinder.
    5. A disc brake according to claim 4, in which said brake-wear compensator comprises a clamping ring mounted on said second portion of the stepped piston and moveable therewith during a brakeapplication stroke of the piston, an abutment provided in said cylinder to limit the movement of the clamping ring during said brake-application stroke of the piston, and a shoulder in the cylinder for limiting the return movement of the piston and the clamping ring, the arrangement being such that when brake wear occurs which requires compensation the piston continues to travel towards the brake disc after engagement of the clamping ring with the abutment whereby the ring automatically adjusts its position axially of the piston by an amount corresponding to the extent of brake-wear and thereby correspondingly limits the return movement of the piston when the ring engages said shoulder.
    6. A disc brake according to any one of the preceding claims and substantially as hereinbefore described with reference to, and as shown in the accompanying drawing.
    7. A disc brake according to any one of the preceding claims and adapted for use on a road vehicle.
    8. A road vehicle having independent wheel suspension, and a disc brake according to any one of the preceding claims operatively associated with each wheel of the vehicle.
GB2304877A 1976-06-02 1977-05-31 Disc brake Expired GB1582601A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762624667 DE2624667A1 (en) 1976-06-02 1976-06-02 DISC BRAKE, IN PARTICULAR FOR COMMERCIAL VEHICLES

Publications (1)

Publication Number Publication Date
GB1582601A true GB1582601A (en) 1981-01-14

Family

ID=5979587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2304877A Expired GB1582601A (en) 1976-06-02 1977-05-31 Disc brake

Country Status (4)

Country Link
DE (1) DE2624667A1 (en)
FR (1) FR2353756A1 (en)
GB (1) GB1582601A (en)
IT (1) IT1078876B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3204188A1 (en) * 1982-02-06 1983-08-11 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover ACTUATING DEVICE FOR HYDRAULIC DISC BRAKES
DE3341480A1 (en) * 1983-11-17 1985-06-05 Alfred Teves Gmbh, 6000 Frankfurt BRAKE CALIPER FOR A PARTIAL DISC BRAKE
DE3539606A1 (en) * 1985-11-08 1986-12-11 Daimler-Benz Ag, 7000 Stuttgart Spot-type disc brake

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1338610A (en) * 1961-11-22 1963-09-27 Teves Kg Alfred Hydraulic brake
US3361229A (en) * 1966-04-25 1968-01-02 Kelsey Hayes Co Caliper-type disk brakes
FR1544925A (en) * 1966-11-16 1968-11-08 Teves Gmbh Alfred Improvements to dual circuit hydraulic braking systems
US3486591A (en) * 1968-06-19 1969-12-30 Clarence E Scheffler Dual automotive brake system
DE2024918A1 (en) * 1970-05-22 1971-12-09 Adam Opel AG, 6090 Rüsselsheim Brake arrangement, in particular a brake caliper for a dual-circuit disc brake
US3666059A (en) * 1970-10-22 1972-05-30 Tom H Thompson Fail-safe hydrualic brake apparatus

Also Published As

Publication number Publication date
FR2353756A1 (en) 1977-12-30
DE2624667A1 (en) 1977-12-15
IT1078876B (en) 1985-05-08

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Legal Events

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