Valve timing control device

Patent metadata

Field	Value
Publication number	US-9562447-B2
Application number	US-201514808642-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 28, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A valve timing control device includes: a driving side rotating body rotating in synchronization with a crankshaft of an internal combustion engine (E); a driven side rotating body rotating integrally with a camshaft of the internal combustion engine and capable of rotating relative to the driving side rotating body; a fluid pressure chamber formed by the driving side rotating body and the driven side rotating body; a partition portion arranged in the fluid pressure chamber and partitioned into a retard chamber and an advance chamber an intermediate lock mechanism including a concave portion a lock member; and a phase control unit controlling the supply of a fluid to the retard chamber and the discharge of the fluid from the advance chamber or the supply of the fluid to the advance chamber and the discharge of the fluid from the retard chamber.

First claim

What is claimed is:

1. A valve timing control device comprising:
a driving side rotating body rotating in synchronization with a crankshaft of an internal combustion engine;
a driven side rotating body rotating integrally with a camshaft of the internal combustion engine and rotatable relative to the driving side rotating body, the camshaft on which an average torque acts in a state where the camshaft rotates integrally with the driven side rotating body;
a fluid pressure chamber formed by the driving side rotating body and the driven side rotating body;
a partition portion arranged in the fluid pressure chamber and partitioned into a retard chamber and an advance chamber, the volume of the retard chamber increasing when a fluid flows in so that a relative rotational phase of the driven side rotating body with respect to the driving side rotating body changes into a retard direction and the volume of the advance chamber increasing when a fluid flows in so that the relative rotational phase changes into an advance direction;
a concave portion disposed in one of the driving side rotating body and the driven side rotating body and a lock member arranged in a groove disposed in the other rotating member and engaged with the concave portion or separated from the concave portion, the relative rotational phase being switchable between a lock state where the relative rotational phase is retained to an intermediate lock phase between a most advance angle phase and a most retarded angle phase as the lock member is engaged with the concave portion and an unlock state where the retained intermediate lock phase is released as the lock member is separated from the concave portion; and
a phase control unit controlling the supply of the fluid to the retard chamber and the discharge of the fluid from the advance chamber or the supply of the fluid to the advance chamber and the discharge of the fluid from the retard chamber so that the relative rotational phase changes,
wherein the relative rotational phase changes in a same direction as a direction of the average torque acting on the camshaft by the supply of the fluid to the advance chamber or the retard chamber by the phase control unit when the relative rotational phase is in the lock state and the internal combustion engine a driving state.

2. The valve timing control device according to claim 1 ,
wherein a part of the lock member protruding from the groove when the relative rotational phase is in the lock state is formed to be solid and a thinned portion is formed at a part of the lock member accommodated in the groove.

3. The valve timing control device according to claim 2 ,
wherein the lock member is disposed radially outward of the concave portion when separated from the concave portion.

4. The valve timing control device according to claim 2 ,
wherein a plane through a part of the lock member abutting against an open end portion of the groove and a part of the lock member abutting against an open end portion of the concave portion when the relative rotational phase is in the lock state is set and the thinned portion is formed from a part of the lock member accommodated in the groove to a part reaching the plane.

5. The valve timing control device according to claim 4 ,
wherein the lock member is disposed radially outward of the concave portion when separated from the concave portion.

6. The valve timing control device according to claim 1 ,
wherein a plane through a part of the lock member abutting against an open end portion of the groove and a part of the lock member abutting against an open end portion of the concave portion when the relative rotational phase is in the lock state is set and a thinned portion is formed from a part of the lock member accommodated in the groove to a part reaching the plane.

7. The valve timing control device according to claim 6 ,
wherein the lock member is disposed radially outward of the concave portion when separated from the concave portion.

8. The valve timing control device according to claim 1 ,
wherein the lock member is disposed radially outward of the concave portion when separated from the concave portion.

Assignees

• Aisin Seiki

Inventors

• Sakata Satoshi
• Kobayashi Masaki
• Ueda Kazuo
• Masuda Shohei

Classifications

• F01L2001/34463

  Locking position intermediate between most retarded and most advanced positions · CPC title

• F01L2001/34466

  with multiple locking devices · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L2001/34473

  Lock movement perpendicular to camshaft axis · CPC title

• F01L2800/01

  Starting · CPC title