EP0264253A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Valve operating apparatus in an internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1987-10-13
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Granted: —
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Expires: 2007-10-13
Abstract
Abstract Apparatus for maintaining a cam follower (9) for operating a valve (1a,1b) of an internal combustion engine in biased engagement against its cam (5) includes a first spring (22) operative to bias the cam follower under a low speed engine operating condition and a second spring (23) series-connected to the first spring and having a spring constant greater than that of the first spring and operative to bias the cam follower under a high speed engine operating condition.
Inventors
- 👤 Yoshio Ajiki
- 👤 Atsushi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F01L1/12; F01L1/18; F01L1/185; F01L1/267; F01L1/46; F01L1/462; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/247
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
Operating apparatus for a valve (1a,1b) in an internal combustion engine, including a camshaft (2) rotatably driven by the engine, a cam (15) on said camshaft, a cam follower (9) for operably interconnecting said cam and said valve, and means (19) for biasing said cam follower against said cam, wherein said biasing means comprises: a stationary base (E) subjacent said cam follower; an abutment member (20) movable in a direction between said base and said cam follower; and spring means extending between said base and said abutment member for biasing said abutment member against said cam follower, including a first spring (22) of relatively small spring constant and a second spring (23) of relatively large spring constant series-connected to said first spring.
Claim 2
Dependent Claim
122 words
Operating apparatus for a valve (1a,1b) in an internal combustion engine, including a camshaft (2) rotatably driven by the engine, a cam (15) on said camshaft, a cam follower (9) for operably interconnecting said cam and said valve, and means (19) for biasing said cam follower against said cam, wherein said biasing means comprises: a stationary base (E) subjacent said cam follower; an abutment member (20) movable in a direction between said base and said cam follower; and spring means extending between said base and said abutment member for biasing said abutment member against said cam follower, including a first spring (22) of relatively small spring constant and a second spring (23) of relatively large spring constant series-connected to said first spring.
Claim 3
Dependent Claim
30 words
Valve operating apparatus according to claim 1, in which said stationary base (E) comprises a bore (24) in said engine and said abutment member (20) is slidable in said bore.
Claim 4
Dependent Claim
35 words
Valve operating apparatus according to claim 2, in which said abutment member (20) is a hollow cylindrical member having a closed end engaging said cam follower (9) and an open end receiving said spring means.
Claim 5
Dependent Claim
72 words
Valve operating apparatus according to claim 3, in which said second spring (23) is a coil spring having one end operatively engaging the base of said bore (24), a retainer (21) mounted in the other end of said second spring, and said first spring (22) having one end mounted in said retainer and its other end biasing said abutment member (20) in spaced relation from said other end of said second spring.
Claim 6
Dependent Claim
97 words
Valve operating apparatus according to any of the preceding claims, further including a drive cam follower (7,8) driven by a rotatable cam (5) for operating said valve (1a,1b) under a first engine operating condition, said spring biased cam follower (9) being a free cam follower which is selectively couplable with said driver cam follower for operating said valve under a second engine operating condition, the arrangement being such that only said first spring (22) biases said abutment member (20) against said free cam follower when said free cam follower is being coupled to said driver cam follower.
References Cited (Backward Citations)
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