Brake pressure rod

• US 5,685,200 A
• Filed: 09/20/1995
• Issued: 11/11/1997
• Est. Priority Date: 10/21/1994
• Status: Expired due to Fees

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Baumann, Hans-Uwe
• Primary Examiner(s): Bonck, Rodney H.
• Assistant Examiner(s): Battista, Mary Ann
• Application Number:
  US08/531,347
• Time in Patent Office: 783 Days
• Field of Search: 74/579 R, 74/581, 74/512, 74/560, 188/371, 188/377, 280/784, 60/547.1
• US Class Current: 74/512
• CPC Class Codes: B60T 13/52 indirect, i.e. vacuum booster units
• CPC Class Codes: B60T 7/04 foot actuated
• CPC Class Codes: G05G 1/46 Means, e.g. links, for connecting the pedal to the controlled unit
• CPC Class Codes: Y10T 74/20528 Foot operated
• CPC Class Codes: Y10T 74/2142 Pitmans and connecting rods

Abstract

A brake pressure rod is described for operating a vehicle brake and is arranged between a pedal and a brake booster. The brake pressure rod consists of an extruded profile with breakthroughs. On one end of the brake pressure rod, a bearing is arranged for the pedal and, on an opposite end, a receiving device is arranged for a rod of the brake cylinder. The brake pressure rod has a desired buckling point which, in the case of a pedal made of plastic and a brake pressure rod made of a light metal alloy, shifts danger as a result of destruction from the pedal to the brake pressure rod.

Claims

1. A brake pressure rod assembly connectable in use between a brake pedal member and a brake booster connecting pin to transmit brake control forces therebetween, comprising:

a brake pressure rod formed with a pair of side walls connected by a plurality of transverse ribs which separate transverse hollow breakthrough openings spaced along said side walls,

a first end of said brake pressure rod having a bearing support which is pivotally connectable with the brake pedal member and an opposite second end of said brake pressure rod having a first longitudinally extending connecting pin accommodating opening in an end most of said transverse ribs.

2. A brake pressure rod assembly according to claim 1, wherein said brake pressure rod is formed as an extruded profile member formed of aluminum.

3. A brake pressure rod assembly according to claim 1, wherein said brake pressure rod is formed as an extruded profile member formed of plastic.

4. A brake pressure rod assembly according to claim 1, comprising a locking plate for detachably connecting one end of said brake pressure rod with said brake booster connecting pin, said locking plate being engageable in a groove on said connecting pin when in an in use position.

5. A brake pressure rod assembly according claim 1, comprising grooves formed by transversely projecting protrusions on said side walls, said grooves being configured to accommodate sealing bellows.

6. A brake pressure rod assembly according claim 5, wherein said grooves are located adjacent one of said transverse ribs.

7. A brake pressure rod assembly according to claim 6, wherein one of said protrusions forming said grooves is provided with a chamfering.

8. A brake pressure rod assembly according to claim 1, wherein said brake pressure rod is an extruded profile member.

9. A brake pressure rod assembly according to claim 2, wherein a second of said transverse ribs includes a second longitudinally extending connecting pin accommodating opening aligned with said first opening.

10. A brake pressure rod assembly according to claim 9, wherein a third of said transverse ribs includes a third longitudinally extending connecting pin accommodating opening aligned with said first and second openings.

11. A brake pressure rod assembly according to claim 10, comprising a locking plate for detachably connecting an end of said brake pressure rod with said brake booster connecting pin, third transverse rib to engage in a ring groove provided on said connecting pin.

12. A brake rod assembly according to claim 1, wherein said bearing support includes aligned transverse openings in said side walls, said side walls adjacent said transverse openings forming a fork head which in use encloses the brake pedal member, said transverse openings being configured to support a bearing pin through the brake pedal member.

13. A brake pressure rod assembly according to claim 12, wherein one of said transverse ribs is provided with a predetermining buckling point which facilitates intentional longitudinal buckling of said pressure rod by accommodating spreading of said side walls forming the fork head in response to excessive brake pedal member forces on said pressure rod during a collision when used on a vehicle.

14. A brake pressure rod assembly according to claim 12, wherein said fork head is wider than other portions of the length of the brake pressure rod.

15. A brake pressure rod assembly according to claim 14, wherein said pressure rod side walls exhibit a continuously widening outer contour in a direction leading to the fork head.

16. A brake pressure rod assembly according to claim 14, wherein, starting from a central area of the brake pressure rod, said side walls define an outer contour which has a continuous widening in a direction of the fork head.

17. A brake pressure rod assembly according to claim 12, wherein said brake pressure rod is an extruded profile member.

18. A brake pressure rod assembly according to claim 17, wherein said brake pressure rod is formed of aluminum.

19. A brake pressure rod assembly according to claim 17, wherein said brake pressure rod is formed of plastic.