Valve timing adjusting device

Patent metadata

Field	Value
Publication number	US-9453438-B2
Application number	US-201414337507-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jul 31, 2013
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

In a valve timing adjusting device, a vane rotor includes a second supply oil passage connectable to a first supply oil passage of a second shaft. A check valve is provided between the vane rotor and the second shaft, and permits a flow from the first supply oil passage toward the second supply oil passage and prevents a flow from the second supply oil passage toward the first supply oil passage. A fixing unit is provided between the check valve and the second shaft, and fixes the check valve between the fixing unit and the vane rotor. The fixing unit includes a third supply oil passage which connects the first supply oil passage and the second supply oil passage. A filter is provided for the fixing unit and can capture foreign substances flowing through the third supply oil passage.

First claim

What is claimed is:

1. A valve timing adjusting device adapted to be provided on a drive force transmission route from a driving shaft to a driven shaft of an engine, the valve timing adjusting device adjusting valve timing of a valve which is opened or closed by the driven shaft, and comprising:
a housing that is rotatable integrally with a first shaft which is one of the driving shaft and the driven shaft;
a vane rotor that is rotatable integrally with a second shaft which is the other one of the driving shaft and the driven shaft and that defines an advance chamber and a retard chamber between the vane rotor and the housing, the vane rotor including second supply oil passage connectable to a first supply oil passage of the second shaft;
a direction switching valve that is provided at a central part of the vane rotor, wherein the direction switching valve connects together the second supply oil passage and the advance chamber at time of rotation of the vane rotor toward an advance side relative to the housing, and connects together the second supply oil passage and the retard chamber at time of rotation of the vane rotor toward a retard side relative to the housing;
a check valve that is provided between the vane rotor and the second shaft and that permits a flow in a direction from the first supply oil passage toward the second supply oil passage and prevents a flow in a direction from the second supply oil passage toward the first supply oil passage;
a fixing unit that is provided between the check valve and the second shaft and fixes the check valve between the fixing unit and the vane rotor, the fixing unit including a third supply oil passage which connects together the first supply oil passage and the second supply oil passage; and
a filter that is provided for the fixing unit and is configured to capture foreign substances flowing through the third supply oil passage; wherein
the check valve is in contact with the vane rotor.

2. The valve timing adjusting device according to claim 1 , wherein:
the fixing unit includes a first plate and a second plate;
the check valve is clamped between the first plate and the vane rotor; and
the filter is clamped between the second plate and the first plate.

3. The valve timing adjusting device according to claim 2 , wherein:
the first plate includes:
a first circumferential groove that extends in a circumferential direction of the first plate along a wall portion of the first plate; and
a first through hole that passes through a part of a bottom wall of the first circumferential groove to communicate with the second supply oil passage;

the second plate includes:
a second circumferential groove that extend in a circumferential direction of the second plate along a wall portion of the second plate; and
a second through hole that passes through a part of a bottom wall of the second circumferential groove to communicate with the first supply oil passage; and

the third supply oil passage includes the first through hole, the first circumferential groove, the second circumferential groove, and the second through hole.

4. The valve timing adjusting device according to claim 3 , wherein the first through hole is located at a different position from the second through hole in the circumferential direction.

5. The valve timing adjusting device according to claim 2 , wherein one of the first plate and the second plate is fixed to the other one of the first plate and the second plate by being press-fitted into a fitting hole of the other one of the first plate and the second plate.

6. The valve timing adjusting device according to claim 1 , wherein:
the fixing unit includes a base member and a formation member;
the check valve is fixed between the base member and the vane rotor;
the formation member is provided between the base member and the second shaft;
the filter is inserted in the formation member; and
at least one of an axial distance of an axial clearance defined by the formation member with respect to the base member or the second shaft, and a radial distance of a radial clearance defined by the formation member with respect to the base member or the second shaft is equal to or smaller than a mesh size of the filter.

7. The valve timing adjusting device according to claim 6 , wherein the formation member includes:
an annular fitting part that is fitted in a fitting recessed part of the base member; and
a filter part that projects radially outward of the fitting part and is formed in a shape of a frame to define therein a space that constitutes the third supply oil passage, the filter being inserted in the filter part to cover the space.

8. The valve timing adjusting device according to claim 7 , wherein the fitting part of the formation member includes a plurality of press-fit protrusions that project radially outward and that are press-fitted in the fitting recessed part.

9. The valve timing adjusting device according to claim 7 , wherein the base member includes a crimped projection that is formed by crimping a rim of the fitting recessed part and that is engaged with the fitting part to prevent a displacement of the formation member in a direction in which the formation member is separated.

10. The valve timing adjusting device according to claim 7 , wherein:
the fitting part of the formation member includes a pawl that is radially inwardly resiliently deformable; and
the base member includes an engagement protrusion that is engaged with the pawl to prevent a displacement of the formation member in a direction in which the formation member is separated.

11. The valve timing adjusting device according to claim 7 , wherein an outer peripheral surface of the fitting part of the formation member is press-fitted into the fitting recessed part.

12. The valve timing adjusting device according to claim 1 , wherein a total opening area of the filter in the third supply oil passage is larger than a passage sectional area of the narrowest part of the first supply oil passage, the second supply oil passage, and the third supply oil passage.

13. A valve timing adjusting device adapted to be provided on a drive force transmission route from a driving shaft to a driven shaft of an engine, the valve timing adjusting device adjusting valve timing of a valve which is opened or closed by the driven shaft, and comprising:
a housing that is rotatable integrally with a first shaft which is one of the driving shaft and the driven shaft;
a vane rotor that is rotatable integrally with a second shaft which is the other one of the driving shaft and the driven shaft and that defines an advance chamber and a retard chamber between the vane rotor and the housing, the vane rotor including a second supply oil passage connectable to a first supply oil passage of the second shaft;
a direction switching valve that is provided at a central part of the vane rotor, wherein the direction switching valve connects together the second supply oil passage and the advance chamber at time of rotation of the vane rotor toward an advance side relative to the housing, and connects together the second supply oil passage and the retard chamber at time of rotation of the vane rotor toward a retard side relative to the housing;
a check valve that is provided between the vane rotor and the second shaft and that permits a flow in a direction from the first supply oil passage toward the second supply oil passage and prevents a flow in a direction from the second supply oil passage toward the first supply oil passage;
a bushing that is provided between the check valve and the second shaft and fixes the check valve between the bushing a

Assignees

• Denso Corp

Inventors

• Ikuma Tomonobu
• Takahashi Kinya
• Isobe Eiji

Classifications

• F01L2001/3444

  Oil filters · CPC title

• F01L2001/34426

  Oil control valves · CPC title

• F01L1/3442 Primary

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

• F01L2001/34456

  Locking in only one position · CPC title