EP0772750A1 - Cylindre de frein pour frein a tambour, et frein a tambour dote d'un tel cylindre - Google Patents

Cylindre de frein pour frein a tambour, et frein a tambour dote d'un tel cylindre

Info

Publication number
EP0772750A1
EP0772750A1 EP95924971A EP95924971A EP0772750A1 EP 0772750 A1 EP0772750 A1 EP 0772750A1 EP 95924971 A EP95924971 A EP 95924971A EP 95924971 A EP95924971 A EP 95924971A EP 0772750 A1 EP0772750 A1 EP 0772750A1
Authority
EP
European Patent Office
Prior art keywords
wheel brake
brake cylinder
anchor plate
contact surface
drum
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Withdrawn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
EP95924971A
Other languages
German (de)
English (en)
Inventor
Frank Biebricher
Peter Lüdtke
Albert Langert
Oliver Haack
Thanh Duc Chau
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0772750A1 publication Critical patent/EP0772750A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/04—Cylinders

Definitions

  • Wheel brake cylinder for drum brakes and drum brake with wheel brake cylinder
  • the invention relates to a wheel brake cylinder intended for drum brakes
  • the invention further relates to a drum brake which is equipped with such a wheel brake cylinder.
  • a wheel brake cylinder of the type mentioned is known, which is manufactured as an extruded profile and in one embodiment has a completely flat contact surface for fastening the wheel brake cylinder to the anchor plate of a drum brake.
  • this known wheel brake cylinder has a recessed contact surface near its two ends, from each of which a threaded bore for fastening to the anchor plate of the associated drum brake is emitted; between these recessed contact surfaces there remains a base at the original profile height, from which channels for the fluid supply and ventilation of the cylinder bore originate.
  • This base has a rectangular outline and is intended to be used in a complementary punching out of the associated anchor plate.
  • the wheel brake cylinder requires fastening Attention must be paid to the associated anchor plate, since the fastening bores emanating from the contact surface must be brought into alignment with corresponding holes in the anchor plate before the associated fastening screws can be inserted.
  • the second embodiment requires an ample dimensioning of the profile height, so that, starting from the recessed contact surfaces, fastening bores of sufficient depth can still be produced.
  • the production of the recessed contact surfaces requires a relatively large amount of machining work.
  • the invention is therefore based on the object of creating the conditions for the fact that a wheel brake cylinder for drum brakes can be reliably mounted on the associated anchor plate with little effort, without the need for particularly extensive machining work beforehand.
  • the object is achieved based on a Radbremszy ⁇ cylinder of the type described in that the system surface has at least one recess for receiving an elevation of the anchor plate.
  • the invention also relates to a drum brake with an anchor plate, which has an elevation which engages in it for each recess of the contact surface of the associated wheel brake cylinder.
  • a wheel brake cylinder in a plane bearing surface, in principle, can be incorporated with a sufficiently shallow depression or a group of two or more such depressions at any point for centering the wheel brake cylinder with respect to the anchor plate of a drum brake.
  • This can be done, for example, by milling, with only a very small volume needing to be machined.
  • the milling of the or each depression is particularly expedient if the wheel brake cylinder is a section of an extruded profile and its contact surface is not machined apart from the or each depression.
  • the wheel brake cylinder is a cast or forged part, it can be used for Casting or forging can be seen with one or more recesses, the machining of which is generally unnecessary.
  • a depression is arranged around the ventilation duct.
  • Such a recess can be produced in the same work step as the usual machining of the ventilation duct.
  • the same also applies to a depression provided around the channel for the fluid supply of the wheel brake cylinder.
  • depressions are arranged on each side of the fluid channel. These depressions are preferably equidistant from the ventilation duct. If a recess is arranged around this, there is a kind of three-point support of the wheel brake cylinder on the anchor plate, which is structurally favorable and has the additional advantage that it is impossible to inadvertently mount the wheel brake cylinder rotated by 180 °.
  • the depressions are preferably spherical cap-shaped; the same can also apply to the elevations of the anchor plate assigned to them.
  • truncated cone-shaped depressions can also be paired with spherical cap-shaped elevations, and vice versa.
  • Fig. 1 shows the bottom view of a wheel brake cylinder according to the invention.
  • Fig. 2 shows the partial longitudinal section II-II in Fig. 1, but with on
  • FIG. 3 shows the partial cross section III-III in FIG. 1, also with the anchor plate attached to the wheel brake cylinder and with the venting nipple fitted and drawn to a larger scale
  • FIG. 4 shows a drum brake with a wheel brake cylinder according to FIG
  • the illustrated wheel brake cylinder 10 is a section of an extruded profile extruded from an aluminum alloy in a doughy state under high pressure; This section has been machined by turning at two end regions 12, an annular groove 14 of a contour customary in wheel brake cylinders being inserted into each of the two end regions 12.
  • a cylinder bore 16 with the axis A extends over the entire length of the wheel brake cylinder 10.
  • the cylinder bore 16 can be produced during extrusion; in this case, subsequent machining is not absolutely necessary.
  • a substantially flat contact surface 18 for fastening the wheel brake cylinder 10 to an anchor plate 20 is formed parallel to the cylinder bore.
  • the contact surface 18 is a rectangle, the width B of which is constant over the entire length between the two end regions 12 and, in the example shown, represents the greatest width of the extruded fil.
  • the extruded profile as such is completely symmetrical with respect to a plane C normal to the contact surface 18, in which the axis A of the cylinder bore 16 lies.
  • Two blind bores 22 extend from the contact surface 18 and lie in a common plane parallel to the central plane C at a short distance.
  • the bores 22 are provided with threads for screws for fastening the wheel brake cylinder 10 to the brake carrier 20.
  • a fluid channel 24 and a ventilation channel 26 also extend from the contact surface 18.
  • the fluid channel 24 extends at right angles to the contact surface 18 and thus parallel to the central plane C; the ventilation channel 26, on the other hand, converges to the central plane C.
  • the contact surface 18 has a recess 28 which has the shape of a spherical cap.
  • the contact surface 18 is provided with a further spherical dome-shaped depression 28 ′ or 28 ′′.
  • the anchor plate 20 has three spherical dome-shaped elevations 30, 30 'and 30 "which each engage in one of the depressions 28, 28' and 28".
  • the elevation 30 has a hole 32 concentric with it, through which a venting nipple 34 can be screwed into the fluid channel 26 which is provided with an internal thread for this purpose.
  • the anchor plate 20 has a hole 36 through which a connection nipple, not shown, for a brake fluid line can be screwed into the fluid channel 24.
  • the wheel brake cylinder 10 is fixed according to FIG. 4 with the aforementioned screws (not shown) on the anchor plate 20 in such a way that it rests on it with the entire contact surface 18, including the recesses 28, 28 'and 28''worked into it.
  • a sleeve 38 with an annular bead formed on it engages in each of the two annular grooves 14.
  • the sleeves 38 each protect one of two pistons 40 which are guided in the cylinder bore 18.
  • One end of a brake shoe 42 is supported on each of the two pistons 40 or 44.
  • the two brake shoes 42 and 44 are by return springs 46 and 48 are connected to one another and are supported with their ends facing away from the pistons 40 on an abutment 50 which is fastened to the brake carrier 20.
  • Extending between the two brake shoes 42 and 44 near the wheel brake cylinder 10 is an adjustable strut 52 of a type customary in drum brakes.

Landscapes

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

Abstract

Le cylindre de frein (10) présenté comporte deux zones d'extrémité (12) entre lesquelles s'étend un alésage (16), et une surface d'appui (18) pour une plaque de fixation (20) qui s'étend parallèlement audit alésage, cependant qu'il est prévu des trous (22) partant de la surface d'appui (18), pour la fixation du cylindre de frein (10) sur la plaque (20). Par ailleurs, des conduits (24, 26) pour l'alimentation en fluide et la purge de l'alésage (16) s'étendent à partir de la surface d'appui (18). Ladite surface d'appui (18) présente plusieurs creux (28, 28', 28") destinés à loger chacun un bossage (30, 30', 30") de la plaque (20). Un creux (28) est disposé autour du conduit de purge (26), et deux autres creux (28', 28"), sont disposés chacun sur un côté du conduit de fluide (24). Lors du montage du cylindre de frein (10) sur la plaque de fixation (20), ses bossages (30, 30', 30") viennent s'engager dans chacun des creux (28, 28', 28"). La position du cylindre de frein (10) est ainsi déterminée de manière sûre, de sorte que, par la suite, les vis de fixation peuvent être vissées dans les trous (22) sans précaution particulière.
EP95924971A 1994-07-28 1995-07-04 Cylindre de frein pour frein a tambour, et frein a tambour dote d'un tel cylindre Withdrawn EP0772750A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9412216U 1994-07-28
DE9412216U DE9412216U1 (de) 1994-07-28 1994-07-28 Radbremszylinder für Trommelbremsen
PCT/EP1995/002589 WO1996003596A1 (fr) 1994-07-28 1995-07-04 Cylindre de frein pour frein a tambour, et frein a tambour dote d'un tel cylindre

Publications (1)

Publication Number Publication Date
EP0772750A1 true EP0772750A1 (fr) 1997-05-14

Family

ID=6911730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95924971A Withdrawn EP0772750A1 (fr) 1994-07-28 1995-07-04 Cylindre de frein pour frein a tambour, et frein a tambour dote d'un tel cylindre

Country Status (8)

Country Link
EP (1) EP0772750A1 (fr)
JP (1) JPH10502999A (fr)
KR (1) KR970704977A (fr)
BR (1) BR9508443A (fr)
CZ (1) CZ20297A3 (fr)
DE (1) DE9412216U1 (fr)
WO (1) WO1996003596A1 (fr)
ZA (1) ZA955990B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19741599A1 (de) 1997-09-20 1999-03-25 Itt Mfg Enterprises Inc Hydraulikzylinder, insbesondere für eine Trommelbremse
DE19745076A1 (de) * 1997-10-11 1999-04-15 Itt Mfg Enterprises Inc Herstellverfahren für ein Radzylindergehäuse einer Trommelbremse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113073A (en) * 1977-09-23 1978-09-12 General Motors Corporation Wheel cylinder
JPS56153124A (en) * 1980-04-30 1981-11-27 Nisshinbo Ind Inc Drum brake
US4553647A (en) * 1984-04-05 1985-11-19 Allied Corporation Wheel cylinder and torque plate construction
DE4204028B4 (de) * 1992-02-12 2005-11-17 Fte Automotive Gmbh & Co. Kg Radzylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9603596A1 *

Also Published As

Publication number Publication date
DE9412216U1 (de) 1995-11-30
WO1996003596A1 (fr) 1996-02-08
ZA955990B (en) 1996-02-22
JPH10502999A (ja) 1998-03-17
BR9508443A (pt) 1997-11-25
CZ20297A3 (en) 1997-07-16
KR970704977A (ko) 1997-09-06

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