Valve driving device using piezoelectric actuator

Patent metadata

Field	Value
Publication number	US-9523294-B2
Application number	US-201414522179-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	May 12, 2014
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A valve driving device using a piezoelectric actuator includes a piezoelectric body of which a volume expands according to a voltage applied thereto. A displacement increase housing amplifies the volume expansion of the piezoelectric body. A swing arm is connected to the displacement increase housing and operated to drive an engine valve according to the amplified expansion of the piezoelectric body.

First claim

What is claimed is:

1. A valve driving device using a piezoelectric actuator, comprising:
a piezoelectric body of which a volume expands according to a voltage applied thereto;
a displacement increase housing for amplifying the volume expansion of the piezoelectric body, the displacement increase housing perpendicularly expanding or contracting with respect to an expansion direction of the piezoelectric body; and
a swing arm connected to the displacement increase housing and operated to drive an engine valve according to the amplified expansion of the piezoelectric body,
wherein the swing arm opens the engine valve when the displacement increase housing perpendicularly contracts, and the swing arm closes the engine valve when the displacement increase housing perpendicularly expands.

2. The valve driving device of claim 1 , wherein:
the piezoelectric body is formed by stacking a plurality of piezoelectric devices and serves as the piezoelectric actuator.

3. The valve driving device of claim 1 , wherein:
the displacement increase housing expands as the piezoelectric body expands.

4. The valve driving device of claim 3 , wherein:
the displacement increase housing expands in a vertical direction as the piezoelectric body expands in a horizontal direction.

5. The valve driving device of claim 1 , wherein:
the displacement increase housing contracts as the piezoelectric body expands.

6. The valve driving device of claim 5 , wherein:
the displacement increase housing contracts in a vertical direction as the piezoelectric body expands in a horizontal direction.

7. The valve driving device of claim 1 , wherein:
the displacement increase housing has a dual frame.

8. The valve driving device of claim 7 , wherein:
the dual frame of the displacement increase housing is operated by a dual hinge.

9. The valve driving device of claim 1 , wherein:
the displacement increase housing includes a preload spring for restricting the piezoelectric body.

10. The valve driving device of claim 1 , wherein:
the piezoelectric body is coupled with the displacement increase housing.

11. The valve driving device of claim 1 , further comprising:
an upper pin for restricting rotation of an upper part of the swing arm and the displacement increase housing;
a lower pin fixes a lower part of the swing arm and the displacement increase housing; and
a valve spring for providing elastic restoring force to the engine valve.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Cho Jin Hee

Classifications

• F01L9/04 Primary

  Mechanical Engineering · mapped topic

• F01L2009/0401

  Mechanical Engineering · mapped topic

• F01L2009/0432

  Mechanical Engineering · mapped topic

• F01L2009/0413

  Mechanical Engineering · mapped topic

• F01L9/24

  Piezoelectric actuators · CPC title