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WO1994025773A1 - Couvercle protecteur du cylindre d'un frein a disque - Google Patents

Couvercle protecteur du cylindre d'un frein a disque Download PDF

Info

Publication number
WO1994025773A1
WO1994025773A1 PCT/EP1993/001009 EP9301009W WO9425773A1 WO 1994025773 A1 WO1994025773 A1 WO 1994025773A1 EP 9301009 W EP9301009 W EP 9301009W WO 9425773 A1 WO9425773 A1 WO 9425773A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
bellows
brake cylinder
protective cap
pocket
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.)
Ceased
Application number
PCT/EP1993/001009
Other languages
German (de)
English (en)
Inventor
Holger Kranlich
Uwe Bach
Rolf Weiler
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.)
ITT Automotive Europe GmbH
Continental Teves AG and Co OHG
Original Assignee
ITT Automotive Europe GmbH
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 ITT Automotive Europe GmbH, Alfred Teves GmbH filed Critical ITT Automotive Europe GmbH
Priority to PCT/EP1993/001009 priority Critical patent/WO1994025773A1/fr
Publication of WO1994025773A1 publication Critical patent/WO1994025773A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16D65/18—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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • F16J3/042—Fastening details
    • 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

Definitions

  • the invention relates to a protective cap for the brake cylinder of a disc brake with an annular bellows, a fastening bead engaging in an annular groove in the piston of the brake cylinder at a first end of the bellows and a second end of the bellows against the wall of an annular recess in the Face of the brake cylinder pressing stiffening insert in the form of a ring which is at least partially surrounded by the material of the bellows.
  • a protective cap of the type specified is known from EP-A 0 366 505.
  • the stiffening insert is completely embedded in the elastomeric material of the bellows and is connected to the elastomeric material by vulcanization. This necessitates a comparatively expensive manufacturing process and makes automatic assembly of the protective cap more difficult, since the assembly tool cannot be supported directly on the stiffening element.
  • the invention has for its object to provide a protective cap of the type mentioned, which can be manufactured in a particularly inexpensive manner and is suitable for automatic assembly.
  • the second end of the bellows forms an annular pocket open on one side, in which the ring is inserted, that the ring has perforations within the pocket which are penetrated by the material of the bellows and that an edge of the ring protruding from the pocket has a contact surface.
  • the protective cap according to the invention there is no adhesive connection between the elastomeric material of the bellows and the inserted ring. Instead, the penetration of the material of the bellows into the perforations of the ring creates a positive connection that firmly connects the two components.
  • the bellows material can be extrusion-coated around the ring without the need for special measures for producing an adhesion, as a result of which a considerable reduction in the cost of manufacture can be achieved.
  • the materials of the ring and bellows can be selected without taking their adhesion behavior into account.
  • the ring can be made of stainless steel or thermoplastic. In addition to rubber-like materials, elastic plastics are also suitable for the production of the bellows.
  • a pocket for receiving the ring ensures a good seal between the second end of the bellows and the brake cylinder, since in this way the wall of the bellows from the clamping point between the ring and the inner wall of the recess in the brake cylinder to the fastening bead, which spans the piston, is not interrupted. A tight connection by gluing the inserted ring to the material of the bellows is therefore not necessary.
  • the outer surface of the ring-shaped pocket which bears against the wall of the recess of the brake cylinder has a sealing bead or a sealing lip.
  • the edge of the ring protruding from the pocket enables the protective cap to be received and rigidly supported in an assembly tool, so that the protective cap can be installed automatically.
  • the required press-in force is transmitted through the positive connection between the ring and the bellows.
  • the limitation of the press-in stroke can either take place on the assembly tool during assembly or the edge of the ring protruding from the pocket can have a radial collar which can be pressed axially against a stop surface on the brake cylinder. The reception in an assembly tool is also facilitated by a radial collar.
  • the ring has resilient tongues arranged at a distance from one another on its circumference, which are bent at an angle with respect to the axial direction and bear against the wall of a recess of the brake cylinder with prestress .
  • the second end of the bellows is advantageously securely fastened by frictional contact of the ring with the brake cylinder.
  • the resilient tongues ensure a certain tolerance compensation. whereby the manufacturing costs are kept low and the assembly is simplified, and on the other hand a firm hold on the brake cylinder, since the edges of the tongues cling to the wall of the recess.
  • a preferred method for producing the protective cap according to the invention is that the ring is extrusion-coated with the elastomeric material in an injection mold for shaping the bellows.
  • the pocket is created directly by the presence of the ring in the injection mold.
  • FIG. 1 shows a cross section through the area of the brake cylinder of a disc brake sealed with a first embodiment of a protective cap according to the invention
  • FIG. 2 shows a cross section through the area of the brake cylinder of a disk brake which is sealed with a further embodiment of a protective cap according to the invention
  • Fig. 3 partial views of different designs to form stiffening rings for one
  • Fig. 6 further designs of the up to fastening of the bellows on the brake cylinder in
  • FIG. 1 shows the open end of a cylinder 1 of a disc brake with a piston 3 protruding from the cylinder bore 2.
  • a protective cap 6 is arranged in the end face 4 of the brake cylinder 1 in which a protective cap 6 is arranged .
  • the protective cap 6 consists of a multi-folded bellows 7 which surrounds the piston 3 in an annular manner and is buttoned at its radially inner end with a fastening bead 8 into an annular groove 9 in the piston 3.
  • the radial outer end 10 of the bellows 7 is stiffened by a cylindrical ring 11 made of stainless steel sheet and is by the ring 11 with its outer surface pressed tightly against the cylindrical inner wall 12 of the recess 5.
  • the ring 11 is embedded in a pocket which is formed by the end 10 of the bellows 7 and is open on one side and projects from the pocket with a collar 13 which is bent radially outwards.
  • the collar 13 is used to attach an assembly tool for the automatic assembly of the end 10 of the protective cap 6 and forms a stop which interacts with the end face 4 of the brake cylinder 1 and by which the insertion depth of the end 10 is limited.
  • the ring 11 is placed in an injection mold for producing the bellows 7 and overmolded with the elastomeric bellows material. Since a sufficient adhesive connection between the ring 11 and the bellows material is not always achieved in this case, the ring 11 is provided with perforations 14 in the form of circular holes into which the bellows material penetrates during the spraying process, in order to thereby establish a positive connection between the ring 11 and the end 10 cause.
  • This positive connection means that the shear forces that occur when the end 10 is pressed into the recess 5 are transmitted, so that the end 10 can be pressed into the illustrated installation position via the ring 11 without the risk of damage to the formed by the end 10 pocket.
  • the protective cap 6 described can thus be reliably and automatically assembled via the ring 11 and tightly connected to the brake cylinder 1.
  • the radially outer end 10 of the bellows 7 is made of a thermoplastic material. put ring 16 stiffened.
  • the ring 16 has perforations in the form of circular openings 17, as shown in FIG. 5.
  • the size of the openings 17 corresponds to the flow properties of the rubber material from which the bellows 7 is made.
  • the ring 16 can also be provided with slots 18 corresponding to the arrangements shown in FIGS. 3 and 4. In this embodiment too, the ring 16 is extrusion-coated with the rubber material of the bellows 7.
  • the ring 40 is widened radially outward in the direction of the brake cylinder 1 and a radial outer edge 41 lies under prestress on a cylindrical wall 37 of a bore or groove Aus ⁇ recess 38 of the brake cylinder 1.
  • the ring 40 has cutouts 42 which are distributed over its circumference and ensure both the elasticity of the ring 40 and the positive connection with the bellows material penetrating into the cutouts 42.
  • the embodiments shown in FIGS. 7 and 8 differ from the previous ones in that the ring 43 is provided on its cylindrical section with resilient tongues 44 and 45 which are spaced apart on the circumference.
  • the tongues 44 are bent radially inwards from the cylindrical section of the ring 43 and the tongues 45 are bent radially outwards so that they form an acute angle with the axial direction.
  • the tongues 44 lie with an edge 51 against a wall 46 and the tongues 45 with an edge 52 against a wall 47, a recess 48 of the brake cylinder 1 under prestress.
  • the elasticity of the tongues 44, 45 results from their shaping of their own and the cutouts 49, 50 remaining after the tongues 44, 45 have been bent again ensure the positive engagement with the bellows material.
  • the end 10 of the bellows can be provided with sealing lips which correspond in arrangement and function to the sealing bead 21 of the exemplary embodiment according to FIG. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

Le couvercle protecteur (6) du cylindre (1) d'un frein à disque comprend un soufflet annulaire (7), un bourrelet de fixation (8) situé à une première extrémité du soufflet (7) et qui pénètre dans une rainure annulaire (9) ménagée dans le piston (3) du cylindre (1) du frein et une insertion de renforcement sous forme d'un anneau (11, 16, 40, 43) entouré au moins en partie par le matériau du soufflet (7). L'insertion de renforcement sollicite la deuxième extrémité du soufflet (7) contre la paroi intérieure (12, 37, 46, 47) d'un évidement annulaire (5, 38, 48) ménagé dans la face frontale (4) du cylindre (1) du frein. La deuxième extrémité (10) du soufflet (7) forme une poche annulaire ouverte d'un seul côté dans laquelle l'anneau (11, 16, 40, 43) est inséré. L'anneau (11, 16, 40, 43) présente, à l'extérieur de la poche, des perforations (14, 17, 18, 42, 49, 50) dans lesquelles pénètre le matériau du soufflet (7).
PCT/EP1993/001009 1993-04-27 1993-04-27 Couvercle protecteur du cylindre d'un frein a disque Ceased WO1994025773A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1993/001009 WO1994025773A1 (fr) 1993-04-27 1993-04-27 Couvercle protecteur du cylindre d'un frein a disque

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1993/001009 WO1994025773A1 (fr) 1993-04-27 1993-04-27 Couvercle protecteur du cylindre d'un frein a disque

Publications (1)

Publication Number Publication Date
WO1994025773A1 true WO1994025773A1 (fr) 1994-11-10

Family

ID=8165722

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/001009 Ceased WO1994025773A1 (fr) 1993-04-27 1993-04-27 Couvercle protecteur du cylindre d'un frein a disque

Country Status (1)

Country Link
WO (1) WO1994025773A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754024A1 (fr) * 1996-09-27 1998-04-03 Peugeot Soufflet de transmission pour un vehicule automobile et son procede de remplacement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685686A (en) * 1984-05-19 1987-08-11 Alfred Teves Gmbh Sealing cap for a bolt guide of a spot-type disc brake
EP0366505A2 (fr) * 1988-10-28 1990-05-02 Alliedsignal Europe Services Techniques Capuchon de piston
WO1993004297A1 (fr) * 1991-08-22 1993-03-04 Itt Automotive Europe Gmbh Couvercle protecteur du cylindre d'un frein a disque

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685686A (en) * 1984-05-19 1987-08-11 Alfred Teves Gmbh Sealing cap for a bolt guide of a spot-type disc brake
EP0366505A2 (fr) * 1988-10-28 1990-05-02 Alliedsignal Europe Services Techniques Capuchon de piston
WO1993004297A1 (fr) * 1991-08-22 1993-03-04 Itt Automotive Europe Gmbh Couvercle protecteur du cylindre d'un frein a disque

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754024A1 (fr) * 1996-09-27 1998-04-03 Peugeot Soufflet de transmission pour un vehicule automobile et son procede de remplacement

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