Control apparatus for variably operated engine valve mechanism of internal combustion engine

a control apparatus and valve mechanism technology, which is applied in the direction of valve arrangement, yielding coupling, coupling, etc., can solve the problems of reducing energy efficiency, energy and generating loss in the oil pump

Inactive Publication Date: 2001-07-19
UNISIA JECS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0014] FIG. 1A is a generally perspective view of a control apparatus for a variably operated engine valve mechanism, a phase converter of which is applicable to a vane type phase converter.

Problems solved by technology

Hence, an energy loss in the oil pump occurs.
Consequently, the energy loss in the oil pump is generated and a reduction of the energy efficiency occurs.
In addition, a high cost electromagnetic switching valve is used for the switch of the flow passage, a high manufacturing cost of the whole regulating apparatus will be resulted.

Method used

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  • Control apparatus for variably operated engine valve mechanism of internal combustion engine
  • Control apparatus for variably operated engine valve mechanism of internal combustion engine
  • Control apparatus for variably operated engine valve mechanism of internal combustion engine

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first embodiment

[0029] FIG. 1A shows a first preferred embodiment of a control apparatus for a variably operated engine valve mechanism, a phase converter of which is applicable to a vane type phase converter.

[0030] That is to say, the control apparatus includes: a sprocket 1 which is a rotary body revolved with a crankshaft (not shown) of an internal combustion engine via a timing chain; a camshaft 2 relatively pivotable with respect to the sprocket 1; a phase converter 3 disposed between the sprocket 1 and the camshaft 2 to convert a relatively pivotal position of both of the sprocket 1 and the camshaft 2; and a hydraulic circuit 4 to operate the phase converter 3.

[0031] FIG. 2 shows a structure of the sprocket 1.

[0032] As shown in FIG. 2, the sprocket 1 includes: a housing 5 having a tooth 5a with which the timing chain is meshed; a rear corner 6 which encloses an opening of a rear end of a housing 55; and a front cover 7 of a substantially disc shape of a lid enclosing the opening of a front en...

second embodiment

[0070] FIG. 4 shows a second preferred embodiment of the control apparatus for the variably operated engine valve according to the present invention.

[0071] In the second embodiment, the phase converter 3 is applicable to the variable open-and-closure timing controlling apparatus disclosed in a Japanese Patent Application First Publication No. Heisei 6-2516 which corresponds to a U.S. Pat. No. 5,557,983 issued on Sep. 24, 1996, the disclosure of which is herein incorporated by reference.

[0072] In the second embodiment, the converter of the vane type is utilized as a hydraulic actuator of an operation mechanism to operate the phase converter 3.

[0073] The phase converter 3 is constituted as shown in FIGS. 5 and 6.

[0074] In FIGS. 5 and 6, reference numeral 40 is a drive axle of an inner side hollow shape, reference numeral 41 is a camshaft disposed on the same axle as an outer periphery of the drive axle 40 for each cylinder, reference numeral 42 denotes a control mechanism for varying ...

third embodiment

[0086] FIG. 7 shows a third preferred embodiment of the control apparatus for the variably operated engine valve mechanism according to the present invention.

[0087] The phase converter 3 and oil pump 22 are the same as those in the second embodiment. In the third embodiment, the hydraulic actuator 70 of the operation mechanism 58 is of a hydraulic cylinder type.

[0088] In details, the hydraulic actuator 70 includes: a cylinder housing 71 disposed on the other end of the control shaft 59 and extended along a direction to an axle (viz., piston rod) of a piston 74A, the piston 74 being slidably housed partitioning an inner space of the cylinder 71 into first hydraulic oil chamber 72 and second hydraulic oil chamber 73 and the piston rod 74A having an outer periphery and linked to a center of the piston 74.

[0089] The piston rod 74A have one free end 74b through which each end of the cylinder housing 71 is penetrated and is linked to a tongue-shaped control plate 75 fixed on a tip of the ...

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Abstract

In a control apparatus for a variably operated engine valve mechanism of an internal combustion engine, a phase converter is disposed to variably control at least one of a displacement and an open-and-closure timing of an engine valve; an oil pump to supply a hydraulic to operate the phase converter, a reversible motor of DC type is disposed to drivingly revolve the oil pump, and a controller is disposed to output a drive current to the reversible motor according to an engine driving condition, the controller controlling a revolution direction of the oil pump via the reversible motor at least when an operation of the phase converter is switched.

Description

[0001] a) Field of the Invention[0002] The present invention relates to a control apparatus for a variably operated engine valve mechanism which variably controls a valve displacement or an open-and-closure timing of an engine valve of an intake or exhaust valve of an internal combustion engine.[0003] b) Description of the related art[0004] A Japanese Patent Application First Publication No. Heisei 9-60507 published on Mar. 4, 1997 exemplifies a previously proposed engine valve (intake valve) open-and-closure timing regulating apparatus.[0005] The disclosed engine valve open-and-closure timing Regulating apparatus is of a vane type. In the disclosed engine valve open-and-closure timing regulating apparatus, a vane fixed on an end of a camshaft is rotatably housed within a cylindrical housing of a timing pulley whose opening end is enclosed with a front cover and a rear cover. An advance angle side oil chamber and a retardation angle side oil chamber are defined between two partition...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01L1/34F01L1/344F01L13/00F02D13/02
CPCF01L13/0021F01L2001/34423F01L2820/041Y10T74/2102
Inventor YAMADA, YOSHIHIKO
Owner UNISIA JECS CORP
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