Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1994-06-15
1995-10-17
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
B61F 1522, F16J 908
Patent
active
054583446
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a dust cover for the brake cylinder, and more particularly relates to dust covers for brake cylinders of disk brakes having a ring-shaped boot, with a fixing torus at a first end of the boot which engages an annular groove in the piston of the brake cylinder and with a stiffening lining in the shape of a ring which is at least partly surrounded by the material of the boot and which urges the second end of the boot against the wall of a ring-shaped recess in the front side of the brake cylinder.
BACKGROUND OF THE INVENTION
A dust cover of the kind indicated is known from the European patent application 0 366 505. In this dust cover, the stiffening lining is completely embedded in the elastomeric material of the boot and united to the elastomeric material by vulcanization. This technique involves a comparatively expensive manufacturing process and is difficult to automate the dust cover because the assembly tools cannot support the boot directly at the stiffening element.
An object of the invention is to create a dust cover which can be manufactured in a particularly inexpensive way and which is suited for an automatic assembly.
SUMMARY OF THE INVENTION
According to the invention this object is achieved in that the second end of the boot forms a unilaterally open, ring-shaped bag into which the ring is inserted, in that the ring is formed with perforations within the bag which are penetrated by the material of the boot, and in that a rim of the ring projecting from the bag is furnished with an abutment surface.
In the inventive dust cover, an adhesive connection between the elastomeric material of the boot and the inserted ring is eliminated. This is due to the penetration of the material of the boot into the perforations of the ring creating a positive lock which firmly ties together both constructional elements. Due to this circumstance, the ring can be coated with the boot material without requiring an adhesive. This allows considerable reduction of the manufacturing costs. In addition, the materials of the ring and of the boot can be selected without considering their adhesion behavior. For example, the ring may be made of stainless steel or of thermoplastic synthetic material. For the manufacture of the boot, rubberlike materials and elastomeric plastic materials may be used. Because of the configuration of a bag for accommodating the ring, a good seal is assured between the second end of the boot and the brake cylinder. This is assured because the wall of the boot is not interrupted from the point of clamping between the ring and the inner wall of the recess of the brake cylinder up to the fixing torus which embraces the piston. A sealed connection by cementing the inserted ring to the material of the boot is, therefore, not necessary. For improving the sealing properties, the outer surface of the ring-shaped bag (which is abutted against the wall of the recess of the brake cylinder) may be formed with a sealing bead or with a sealing lip.
The rim of the ring projecting from the bag allows the dust cover to be supported by one assembly tool, this, in turn, allows the dust cover to be mounted automatically. The required pressing-in force is, in this event, transmitted by the positive locking engagement between the ring and the boot. The limit of the pressing-in stroke can be effected during assembly either at the assembly tool or the rim of the ring jutting out of the bag may have a radial collar which allows it to be urged in axial direction against an abutment surface at the brake cylinder. The accommodation in an assembly tool, too, will be facilitated by a radial collar.
In another embodiment of the inventive dust cover, the rim of the ring projecting out of the bag may engage a wall of the recess within the brake cylinder in order (by direct frictional contact with the brake cylinder) to secure the second end of the boot to the brake cylinder. In this conjunction, the rim of the ring may be bent over in radial direction and be interrupted by cutouts w
REFERENCES:
patent: 3191950 (1965-06-01), Hiltner
patent: 3197217 (1965-07-01), Mastrobattista et al.
patent: 3285547 (1966-11-01), Henry
patent: 4220418 (1980-09-01), Kondo et al.
patent: 4270442 (1981-06-01), Bainard et al.
patent: 4852891 (1989-08-01), Sugiura et al.
International Search Report for PCT/EP92/01921.
International Preliminary Examination Report for PCT/EP92/01921.
Bach Uwe
Lenzner Horst
Weiler Rolf
Cuchlinski Jr. William A.
Hwang Keith
ITT Automotive Europe GmbH
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