Hydraulic pressure control valve and internal-combustion engine valve timing control apparatus

1. A hydraulic pressure control valve comprising:

a valve body including a cylindrical peripheral wall, a plurality of opening portions formed in the peripheral wall at respective positions spaced from each other in an axial direction of the peripheral wall to allow hydraulic fluid to flow therethrough in a radial direction of the peripheral wall, annular grooves formed on an outer periphery of the peripheral wall at axially spaced positions at which the opening portions are formed, respectively, and a restraining portion provided in each of the annular grooves;

a spool valve axially movably provided in the peripheral wall to open and close at least one of the opening portions according to a moving position of the spool valve; and

filters wound around the peripheral wall to cover the opening portions, respectively, the filters each including a mesh portion for filtering the hydraulic fluid and a mask portion covering the restraining portion,

wherein when the axial direction of the peripheral wall is assumed to be a widthwise direction of the mask portion, widthwise ends of the mask portion are open;

wherein the restraining portion is a projection projecting radially outward of the valve body; and

wherein the mask portion is an outwardly projecting portion projecting radially outward of the valve body to cover the projection.

2. The hydraulic pressure control valve of claim 1 , wherein the mesh portion is provided at each of two positions facing each other in a circumferential direction of the valve body across the mask portion.

3. The hydraulic pressure control valve of claim 2 , wherein the projection is provided at a circumferential end edge of an associated one of the opening portions.

4. The hydraulic pressure control valve of claim 3 , wherein a plurality of projections are provided at respective positions overlapping each other as viewed in the axial direction of the peripheral wall.

5. The hydraulic pressure control valve of claim 1 , wherein the projection is narrower in width than each of the filters.

6. The hydraulic pressure control valve of claim 1 , wherein there is a clearance provided between the mask portion and the projection.

7. The hydraulic pressure control valve of claim 1 , wherein there are a plurality of the outwardly projecting portions provided in a circumferential direction of the valve body.

8. The hydraulic pressure control valve of claim 1 , wherein when the axial direction of the peripheral wall is assumed to be a widthwise direction of each of the filters, the mask portion is a recess provided in a widthwise central region of the respective filter.

9. The hydraulic pressure control valve of claim 1 , wherein the filters are each formed from a metal sheet.

10. The hydraulic pressure control valve of claim 9 , wherein the filters each have a welded joint portion at a position radially opposing the restraining portion.

11. The hydraulic pressure control valve of claim 1 , wherein when the axial direction of the peripheral wall is assumed to be a widthwise direction of the filters, the filters each have a substantially uniform width.

12. A hydraulic pressure control valve comprising:

a valve body including a plurality of opening portions formed in a cylindrical peripheral wall at respective positions spaced from each other in an axial direction of the peripheral wall to allow hydraulic fluid to flow therethrough in a radial direction of the peripheral wall,

the valve body further having circumferentially continuous annular grooves formed on the peripheral wall at axially spaced positions at which the opening portions are formed, respectively;

a spool valve axially movably provided in the valve body to open and close the opening portions according to a moving position of the spool valve; and

filters wound in the annular grooves to cover the opening portions, respectively;

the filters extending along and covering projections provided in the annular grooves, respectively, the projections projecting radially outward of the peripheral wall, thereby restraining circumferential movement of the filters relative to the valve body.

13. An internal-combustion engine valve timing control apparatus comprising:

a driving rotary member to which rotational force is transmitted from a crankshaft, the driving rotary member having an operation chamber formed therein;

a driven rotary member rotatably accommodated in the driving rotary member to divide the operation chamber into an advance operation chamber and a retard operation chamber, the driven rotary member being rotated relative to the driving rotary member toward an advance side or a retard side in response to supply and discharge of hydraulic fluid into and from the advance and retard operation chambers;

a hydraulic pressure control valve configured to control supply and discharge of hydraulic fluid delivered from an oil pump into and from the advance and retard operation chambers; and

an actuator configured to operate the hydraulic pressure control valve;

the hydraulic pressure control valve comprising:

a valve body including a plurality of opening portions formed in a cylindrical peripheral wall at respective positions spaced from each other in an axial direction of the peripheral wall to allow hydraulic fluid to flow therethrough in a radial direction of the peripheral wall, the valve body further including annular grooves formed on an outer periphery of the peripheral wall at axially spaced positions at which the opening portions are formed, respectively, and a restraining portion provided in each of the annular grooves;

a spool valve axially movably provided in the peripheral wall to open and close the opening portions according to a moving position of the spool valve; and

filters wound to cover the opening portions, respectively, the filters each having a mesh portion for filtering the hydraulic fluid and a mask portion covering the restraining portion,

wherein when the axial direction of the peripheral wall is assumed to be a widthwise direction of the mask portion, widthwise ends of the mask portion are open;

wherein the restraining portion is a projection projecting radially outward of the valve body; and

wherein the mask portion is an outwardly projecting portion projecting radially outward of the valve body to cover the projection.