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EP0179581A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Variable valve timing mechanism
Assignee: Rover Co Ltd
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Filing: 1985-09-30
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Granted: —
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Expires: 2005-09-30
Abstract
Abstract 57 A variable valve timing mechanism uses the known principle of an eccentric drive to the camshafts 2, 3. The drive is by means of a shaft 1 which extends through the sleeves and can be moved by means of a bearing 11 in a translational sense with respect to the axes of rotation to the cams. The shaft 1 has lateral projections 8, 9 which couple to the cam lobes. When the shaft is moved in the direction of arrows 11 or 12 the eccentricity of the drive to the cams is varied and the valve timing is altered.
Inventors
- 👤 Graham Ernest Atkin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 11:20
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/356; F01L1/02; F01L1/04; F01L1/047; F01L2001/0475
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
1 A variable valve timing mechanism for an internal combustion engine comprising a valve actuating cam on a rotatably mounted hollow camshaft, and a shaft for driving the camshaft, which shaft extends through the hollow camshaft and is movable in a translational sense relative to the axis of rotation of the cam, the shaft having a lateral projection so coupled to the cam lobe as to drive the camshaft with varying amounts of eccentricity as the shaft is moved, in order to vary the valve timing.
Claim 2
Dependent Claim
86 words
1 A variable valve timing mechanism for an internal combustion engine comprising a valve actuating cam on a rotatably mounted hollow camshaft, and a shaft for driving the camshaft, which shaft extends through the hollow camshaft and is movable in a translational sense relative to the axis of rotation of the cam, the shaft having a lateral projection so coupled to the cam lobe as to drive the camshaft with varying amounts of eccentricity as the shaft is moved, in order to vary the valve timing.
Claim 3
Dependent Claim
26 words
2 A mechanism as claimed in claim 1, wherein the camshaft carries two cams, and the bearing for the camshaft is located between the two cams.
Claim 4
Dependent Claim
28 words
3 A mechanism as claimed in claim 2, wherein one of the cams is for operating an inlet valve and the other is for operating an exhaust valve.
Claim 5
Dependent Claim
20 words
4 A mechanism as claimed in claim 2, wherein both of the cams are for inlet, or for exhaust, valves.
Claim 6
Dependent Claim
22 words
5 A mechansims as claimed in any one of claims 1 to 4, wherein there is a separate camshaft for each cylinder.
Claim 7
Dependent Claim
27 words
6 A mechanism as claimed in claim 5, wherein there are two camshafts for each cylinder, to vary the valve timing of inlet and exhaust valves separately.
Claim 8
Dependent Claim
37 words
7 A mechanism as claimed in claim 5 or claim 6, wherein adjacent camshafts are driven by an intermediate driving member comprising a sleeve surrounding the driving shaft with which the respective lateral projections are formed integrally.
Claim 9
Dependent Claim
43 words
8 A mechanism as claimed in any one of claim 1 to 7, wherein there is a slot in the lateral projection or in the cam lobe which slot is engaged by a slider connected to the cam lobe or lateral projection, respectively.
Claim 10
Dependent Claim
24 words
9 A mechanism as claimed in claim 8, wherein the slider engages a pin which extends through the lateral projection or the cam lobe.
Claim 11
Dependent Claim
16 words
10 A variable valve timing mechanism substantially as hereinbefore described with reference to the accompanying drawing.
Claim 12
Dependent Claim
16 words
10 A variable valve timing mechanism substantially as hereinbefore described with reference to the accompanying drawing.
References Cited (Backward Citations)
No citation records indexed.
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