GB1533654A - Internal combustion engine - Google Patents

Internal combustion engine

Info

Publication number
GB1533654A
GB1533654A GB50616/74A GB5061674A GB1533654A GB 1533654 A GB1533654 A GB 1533654A GB 50616/74 A GB50616/74 A GB 50616/74A GB 5061674 A GB5061674 A GB 5061674A GB 1533654 A GB1533654 A GB 1533654A
Authority
GB
United Kingdom
Prior art keywords
oil
tappet
engine
valve
inlet
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
GB50616/74A
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.)
Rover Co Ltd
Original Assignee
Rover Co 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 Rover Co Ltd filed Critical Rover Co Ltd
Priority to GB50616/74A priority Critical patent/GB1533654A/en
Publication of GB1533654A publication Critical patent/GB1533654A/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
    • F01L13/0031—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
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • F01L9/14—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

1533654 Hydraulic valve gear BRITISH LEYLAND UK Ltd 3 Dec 1975 (22 Nov 1974] 50616/74 Heading F1B [Also in Division F2] A self-adjusting I.C. engine inlet valve hydraulic tappet assembly is constructed to provide a controlled amount of lost-motion between the tappet assembly and the inlet valve 15 so as to vary the lift imparted to the valve 15 from a cam C in response to the engine speed and the viscosity of the oil in the tappet assembly during engine operation. The tappet assembly comprises a cam engaging first tappet member 24 slidably supported in a control sleeve 26 and having a bearing support wall 23, 22 slidably supporting a second tappet member 21 maintained in contact with the end 20 of the inlet valve 15 by a spring 25, the support wall 23 forming an enclosure 30 between the tappet members 24, 21. Inlet and outlet ports 29, 28 in the tappet 24 are arranged to co-operate with rectangular and triangular inlet and outlet orifices 31, 32, in the sleeve 26 which has a toothed flange 33, 34 and is turnable about its axis 1 by a control regulating rack 35 linearly displaceable by a throttle linkage (not shown), each turning movement of the sleeve 26, in response to the engine throttle setting, serving to vary the height of the triangular outlet orifice 32 to thus vary the exhaust rate, to an outlet duct 38, of the engine oil fed to the enclosure 30 from an engine oil source i.e. inlet plenom 41, one-way valve 24, duct 40 and inlet port 29, such variations of the exhaust rate automatically varying the lost-motion within the tappet assembly and hence the valve lift and opening period. The rack 35 additionally has a tapered restrictor 37 which enables flow from the output duct 38 into a return plenom 39 to be regulated, the narrow end of the restrictor 37 serving at low engine speeds to restrict oil flow from the enclosure, whilst, at higher engine speeds, the wider end of the restrictor 37 is interposed in the exhaust oil path to allow unrestricted flow of such oil as does escape from the enclosure 30. Increased oil leakage from the tappet assembly due to reduced oil viscosity at elevated oil temperatures is compensated by a thermal device which is responsive to the oil temperature in or near the enclosure 30 and acts to further move the rack 35 appropriately adjust the valve lift accordingly. The regulating rack 35 may be used as an engine speed regulator in place of the usual carburetter butterfly type throttle valve, all throttling being undertaken by the variable inlet valve lift.
GB50616/74A 1975-12-03 1975-12-03 Internal combustion engine Expired GB1533654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB50616/74A GB1533654A (en) 1975-12-03 1975-12-03 Internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB50616/74A GB1533654A (en) 1975-12-03 1975-12-03 Internal combustion engine

Publications (1)

Publication Number Publication Date
GB1533654A true GB1533654A (en) 1978-11-29

Family

ID=10456642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB50616/74A Expired GB1533654A (en) 1975-12-03 1975-12-03 Internal combustion engine

Country Status (1)

Country Link
GB (1) GB1533654A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470381A (en) * 1979-12-05 1984-09-11 Eaton Corporation Hydraulic tappet for direct-acting valve gear
WO1985001984A1 (en) * 1983-10-31 1985-05-09 Fujio Inoue Valve opening/closing mechanism for prime mover
US4590898A (en) * 1979-12-05 1986-05-27 Eaton Corporation Hydraulic tappet for direct-acting valve gear
GB2194587A (en) * 1986-06-12 1988-03-09 South Western Ind Res Variable actuator for a valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470381A (en) * 1979-12-05 1984-09-11 Eaton Corporation Hydraulic tappet for direct-acting valve gear
US4590898A (en) * 1979-12-05 1986-05-27 Eaton Corporation Hydraulic tappet for direct-acting valve gear
WO1985001984A1 (en) * 1983-10-31 1985-05-09 Fujio Inoue Valve opening/closing mechanism for prime mover
GB2194587A (en) * 1986-06-12 1988-03-09 South Western Ind Res Variable actuator for a valve

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee