WO1996003596A1 - Wheel brake cylinder for drum brakes and drum brake comprising a wheel brake cylinder - Google Patents
Wheel brake cylinder for drum brakes and drum brake comprising a wheel brake cylinder Download PDFInfo
- Publication number
- WO1996003596A1 WO1996003596A1 PCT/EP1995/002589 EP9502589W WO9603596A1 WO 1996003596 A1 WO1996003596 A1 WO 1996003596A1 EP 9502589 W EP9502589 W EP 9502589W WO 9603596 A1 WO9603596 A1 WO 9603596A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wheel brake
- brake cylinder
- anchor plate
- contact surface
- drum
- Prior art date
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
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970700251A KR970704977A (en) | 1994-07-28 | 1995-07-04 | Drum brake wheels - Brake cylinders and wheels - Drum brakes with brake cylinders |
JP8505390A JPH10502999A (en) | 1994-07-28 | 1995-07-04 | Wheel brake cylinder for drum brake and drum brake with wheel brake cylinder |
CZ97202A CZ20297A3 (en) | 1994-07-28 | 1995-07-04 | Disk-like braking cylinder for drum brakes |
EP95924971A EP0772750A1 (en) | 1994-07-28 | 1995-07-04 | Wheel brake cylinder for drum brakes and drum brake comprising a wheel brake cylinder |
BR9508443A BR9508443A (en) | 1994-07-28 | 1995-07-04 | Wheel brake cylinder for drum brakes and drum brake with wheel brake cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9412216U DE9412216U1 (en) | 1994-07-28 | 1994-07-28 | Wheel brake cylinder for drum brakes |
DEG9412216.4U | 1994-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996003596A1 true WO1996003596A1 (en) | 1996-02-08 |
Family
ID=6911730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/002589 WO1996003596A1 (en) | 1994-07-28 | 1995-07-04 | Wheel brake cylinder for drum brakes and drum brake comprising a wheel brake cylinder |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0772750A1 (en) |
JP (1) | JPH10502999A (en) |
KR (1) | KR970704977A (en) |
BR (1) | BR9508443A (en) |
CZ (1) | CZ20297A3 (en) |
DE (1) | DE9412216U1 (en) |
WO (1) | WO1996003596A1 (en) |
ZA (1) | ZA955990B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19741599A1 (en) | 1997-09-20 | 1999-03-25 | Itt Mfg Enterprises Inc | Hydraulic cylinder, in particular for a drum brake |
DE19745076A1 (en) * | 1997-10-11 | 1999-04-15 | Itt Mfg Enterprises Inc | Wheel cylinder brake housing with continuous piston hole |
Citations (4)
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 |
DE4204028A1 (en) * | 1992-02-12 | 1993-08-19 | Kugelfischer G Schaefer & Co | Method of fastening wheel cylinder to vehicle brake shield - uses right angled seal between hole in shield and projection on cylinder |
-
1994
- 1994-07-28 DE DE9412216U patent/DE9412216U1/en not_active Expired - Lifetime
-
1995
- 1995-07-04 EP EP95924971A patent/EP0772750A1/en not_active Withdrawn
- 1995-07-04 JP JP8505390A patent/JPH10502999A/en active Pending
- 1995-07-04 WO PCT/EP1995/002589 patent/WO1996003596A1/en not_active Application Discontinuation
- 1995-07-04 KR KR1019970700251A patent/KR970704977A/en not_active Application Discontinuation
- 1995-07-04 CZ CZ97202A patent/CZ20297A3/en unknown
- 1995-07-04 BR BR9508443A patent/BR9508443A/en not_active Application Discontinuation
- 1995-07-18 ZA ZA955990A patent/ZA955990B/en unknown
Patent Citations (4)
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 |
DE4204028A1 (en) * | 1992-02-12 | 1993-08-19 | Kugelfischer G Schaefer & Co | Method of fastening wheel cylinder to vehicle brake shield - uses right angled seal between hole in shield and projection on cylinder |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 6, no. 36 (M - 115) 5 March 1982 (1982-03-05) * |
Also Published As
Publication number | Publication date |
---|---|
KR970704977A (en) | 1997-09-06 |
EP0772750A1 (en) | 1997-05-14 |
DE9412216U1 (en) | 1995-11-30 |
BR9508443A (en) | 1997-11-25 |
ZA955990B (en) | 1996-02-22 |
JPH10502999A (en) | 1998-03-17 |
CZ20297A3 (en) | 1997-07-16 |
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