US 7,350,486 B1Granted

Variable valve actuation mechanism

AssigneeIndustrial Technology Research Institute

InventorsMin-Chuan Wu, Ta-Chuan Liu

Life of this patent

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Abstract

The present invention discloses a variable valve actuation mechanism, characterized in that movement of a sliding block is controlled for selectively receiving a driving force exerted from an actuating mechanism so as to control lift, such as higher or lower lift, of valves disposed in a combustion engine. With the design disclosed in the present invention, a conventional problem due to misalignment of the channel for locking pin sliding during changing lift of valve is capable of being solved. In the preferred embodiment of the present invention, actuating parts for controlling higher valve lift will not contact with the variable valve actuation mechanism while the valve is under lower lift so that the combustion engine will be operated in an appropriate rotation speed efficiently so as to reduce fuel consumption.

Claims17

Dependent claims

A variable valve actuation mechanism, comprising:

a tappet, having an accommodation space formed therein;
a sliding block, arranged inside the accommodation space, and
a driving apparatus, for driving the sliding block to slide inside the accommodation space and thus enabling a part selected from the group consisting of the tappet and the sliding block to be selected for receiving a driving force and moved accordingly;
wherein said sliding block further comprising:
at least a first groove hole, formed at a side of the sliding block;
at least a first hydraulic pressure sleeve, each being fitted inside the at least one first groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the first hydraulic pressure sleeve while being driven to move by the driving apparatus;
at least a second groove hole, formed at a side of the sliding block other than that of the first groove hole;
and
at least a second hydraulic pressure sleeve, each being fitted inside the at least one second groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the second hydraulic pressure sleeve while being driven to move by the driving apparatus.

6 more elements

A variable valve actuation mechanism comprising:

a tappet, having an accommodation space formed therein;
a sliding block, arranged inside the accommodation space, and
a driving apparatus, for driving the sliding block to slide inside the accommodation space and thus enabling a part selected from the group consisting of the tappet and the sliding block to be selected for receiving a driving force and moved accordingly;
wherein said sliding block further comprising:
at least a first groove hole, formed at a side of the sliding block;
at least a first hydraulic pressure sleeve, each being fitted inside the at least one first groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the first hydraulic pressure sleeve while being driven to move by the driving apparatus.

3 more elements

A variable valve actuation mechanism, comprising:

a tappet, having an accommodation space formed therein;
a sliding block, arranged inside the accommodation space;
and
a driving apparatus, for driving the sliding block to slide inside the accommodation space and positioning the same at a position selected from a first position and a second position, where the sliding block is enabled to receive a driving force at the selected position of the driving apparatus and moved accordingly;
wherein the sliding block further comprises:
at least a first groove hole, formed at a side of the sliding block;
at least a first hydraulic pressure sleeve, each being fitted inside the at least one first groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the first hydraulic pressure sleeve while being driven to move by the driving apparatus;
at least a second groove hole, formed at a side of the sliding block other than that of the first groove hole;
and
at least a second hydraulic pressure sleeve, each being fitted inside the at least one second groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the second hydraulic pressure sleeve while being driven to move by the driving apparatus.

7 more elements

A variable valve actuation mechanism comprising:

a tappet, having an accommodation space formed therein;
a sliding block, arranged inside the accommodation space;
and
a driving apparatus, for driving the sliding block to slide inside the accommodation space and positioning the same at a position selected from a first position and a second position, where the sliding block is enabled to receive a driving force at the selected position of the driving apparatus and moved accordingly;
wherein the sliding block further comprises:
at least a first groove hole, formed at a side of the sliding block;
at least a first hydraulic pressure sleeve, each being fitted inside the at least one first groove hole while enabling an end thereof to be fixedly connected to the tappet for enabling the sliding block to move slidably with respect to the first hydraulic pressure sleeve while being driven to move by the driving apparatus;
and
at least a via hole, boring through the sliding block.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/563,455Filed 27 Nov 2006
Priority: TW 95140651 A3 Nov 2006
Granted: 1 Apr 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F01L 1/143
Tappets ; Push rods: for use with overhead camshafts
F01L 1/25
Hydraulic tappets: between cam and valve stem
F01L 13/0005
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations: deactivating valves
F01L 13/0031
For optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque: by…