# US 5,706,770 A · Valve drive of an internal combustion engine

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- Number: US 5,706,770 A
- Document ID: US5706770A
- Status: Granted
- Kind: A
- Application number: 08/687,540
- Filed: 1996-08-02
- Granted: 1998-01-13
- Earliest claimed: 1994-04-06
- Assignees: INA Walzlager Schaeffler KG
- Inventors: Dieter Schmidt; Arndt Ihlemann; Bodo Rorig
- Web page: https://patentgrep.com/patent/US5706770A

## CPC

- F01L 1/185: {Overhead end-pivot rocking arms}
- F01L 1/46: Component parts, details, or accessories, not provided for in preceding subgroups
- Y10T 74/20882: Rocker arms
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A finger lever for a valve drive of an internal combustion engine which finger lever is contacted in a central region by a control cam and cooperates at one end with a gas exchange valve in the opening direction while being pivoted at another end by a bore on a shaft for pivoting relative to a cylinder head of an internal combustion engine by means projecting radially beyond a peripheral surface of a shaft in the region of a surrounding cam follower.

## Claims

### Claim 1

A valve drive of an internal combustion engine whose finger lever (2) or rocker arm (8) is pivoted by a bore (7) on a shaft (8) for pivoting relative to a cylinder head, a region of the shaft (8) which is surrounded by the bore (7) of the finger lever (2) or rocker arm (9) and extends at least near a central longitudinal plane thereof comprises a recess (10, 19, 31, 35, 37a) in which a projecting means (11, 16, 22, 25, 32, 35a, 38) is arranged so as to extend radially beyond a peripheral surface (23) of the shaft (8) and engage into a recess (13, 14, 24, 33, 37, 40) of complementary shape made in the bore (7), or said projecting means is arranged in the recess of the bore (7) to project therefrom and into the recess of the shaft, characterized in that the recess of the shaft (8) is made of an annular groove (10) which is surrounded by the recess of the bore (7) made as an annular groove (13), the projecting means is optionally a radially inwards biased circlip (11) arranged in the annular groove (10) or a radially outwards biased circlip (16) arranged in the annular groove (13), an outer annular portion (12) of the circlip (11) extending into the annular groove (13) and an inner annular portion (17) of the circlip (16) extending into the annular groove (10).

### Claim 2 (depends on 1)

A valve drive of claim 1 wherein the shaft (8) is made as a hollow shaft comprising a bore (15), and in the region of shaft (8) surrounded by the finger lever (2) or rocker arm (9), there is arranged at least one radial bore (18) for a transfer of lubricant to the bore (7).