GB1493246A - Engines - Google Patents

Engines

Info

Publication number
GB1493246A
GB1493246A GB3685074A GB3685074A GB1493246A GB 1493246 A GB1493246 A GB 1493246A GB 3685074 A GB3685074 A GB 3685074A GB 3685074 A GB3685074 A GB 3685074A GB 1493246 A GB1493246 A GB 1493246A
Authority
GB
United Kingdom
Prior art keywords
cam
shaft
valve
plunger
engine speed
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.)
Expired
Application number
GB3685074A
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.)
Bentley Motors Ltd
Original Assignee
Rolls Royce Motors Ltd
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 Rolls Royce Motors Ltd filed Critical Rolls Royce Motors Ltd
Priority to GB3685074A priority Critical patent/GB1493246A/en
Publication of GB1493246A publication Critical patent/GB1493246A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length

Abstract

1493246 Hydraulic tappets ROLLS-ROYCE MOTORS Ltd 19 Aug 1975 [22 Aug 1974] 36850/74 Heading F2K [Also in Division F1] Valve lift may be varied in an I.C. engine in dependence upon engine speed or load, by providing in the valve-operating gear between a cam-shaft 5 and a valve 4, an hydraulic tappet 1, 2, 3 and a plunger 7 to vary the tappet length (by forcing oil between parts 1, 2) operated by an additional cam-shaft 9. The hydraulic tappet 1, 2, 3 may be located directly between the cam-shaft 5 and valve stem 4, or may be located between a cam-shaft and a push-rod (not shown). To operate the plunger 7 the additional cam-shaft 9 may be axially shiftable to bring a cam 8 into engagement therewith. Several plungers (not shown) and severed cam surfaces or a complex cam surface can be employed to provided incremental changes in valve lift with increasing engine speed. Alternatively a lever 27 (Fig. 4) may operate a plunger 25 from the cam-shaft 31, the lever 27 having a variable fulcrum, the position of which is determined by engine speed or load by moving a further lever 30.
GB3685074A 1975-08-19 1975-08-19 Engines Expired GB1493246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3685074A GB1493246A (en) 1975-08-19 1975-08-19 Engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3685074A GB1493246A (en) 1975-08-19 1975-08-19 Engines

Publications (1)

Publication Number Publication Date
GB1493246A true GB1493246A (en) 1977-11-30

Family

ID=10391689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3685074A Expired GB1493246A (en) 1975-08-19 1975-08-19 Engines

Country Status (1)

Country Link
GB (1) GB1493246A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171454A (en) * 1985-02-26 1986-08-28 South Western Ind Res An adjustable valve actuator for an engine
CN100408826C (en) * 2003-05-28 2008-08-06 本田技研工业株式会社 Valve moving device for engine
WO2010146229A1 (en) * 2009-06-17 2010-12-23 Wärtsilä Finland Oy A control arrangement for gas exchange in a piston engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171454A (en) * 1985-02-26 1986-08-28 South Western Ind Res An adjustable valve actuator for an engine
CN100408826C (en) * 2003-05-28 2008-08-06 本田技研工业株式会社 Valve moving device for engine
WO2010146229A1 (en) * 2009-06-17 2010-12-23 Wärtsilä Finland Oy A control arrangement for gas exchange in a piston engine

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee