JP6733594B2 - Valve timing adjustment device - Google Patents

Description

The present invention relates to a valve timing adjusting device.

2. Description of the Related Art There is known a valve timing adjusting device that is provided in a power transmission path that transmits power from a drive shaft of an internal combustion engine to a driven shaft and that adjusts valve timing of a valve that is driven to open and close by the driven shaft. In the case of a hydraulic type, the valve timing adjustment device includes a housing that rotates in conjunction with one of a drive shaft and a driven shaft, and a vane rotor fixed to the other end of the drive shaft and the driven shaft. By supplying hydraulic oil to one of the retard chamber and the advance chamber defined by the vane rotor, the vane rotor is relatively rotated in the retard direction or the advance direction with respect to the housing. The hydraulic oil supplied to the retard chamber and the advance chamber is controlled by the hydraulic control valve.

Japanese Patent No. 5941602

For example, in the valve timing adjusting device of Patent Document 1, a sleeve forming a hydraulic oil control valve has a supply opening through which hydraulic oil supplied from a hydraulic oil supply source flows, and a retard opening opening communicating with a retard chamber. , An advance opening communicating with the advance chamber, a delay drain opening through which the working oil discharged from the retard chamber flows, a advance drain opening through which the working oil discharged from the advance chamber flows , A retard recycle opening through which hydraulic oil returns from the retard chamber to the hydraulic control valve, and an advance recycle opening through which hydraulic oil returns from the advance chamber to the hydraulic control valve. The two recycle openings allow reuse of hydraulic oil from the retard chamber and the advance chamber.
In the valve timing adjusting device of Patent Document 1, the two recycle oil passages passing through the recycle opening are respectively operated to the retard oil supply passage passing through the retard opening and the advance supply oil passage passing through the advance opening. It is connected outside the oil control valve. Further, the two drain openings are formed independently of the two recycling openings, the retard opening and the advance opening. Therefore, it is necessary to form a large number of openings in the hydraulic oil control valve as described above. Therefore, the physical size of the hydraulic oil control valve may increase in the direction in which the openings are arranged.

An object of the present invention is to provide a valve timing adjusting device including a small hydraulic oil control unit.

The present invention relates to a valve timing adjusting device (10) for adjusting the valve timing of valves (4, 5) of an internal combustion engine (1), which comprises a phase converter (PC), a hydraulic oil supply source (OS), and a hydraulic oil. Control unit (OC), oil discharge unit (OD), retard oil supply passage (RRs), advance oil supply passage (RAs), drain oil passage (RRd, RAd), recycle oil passage (Rre), recycle check valve (81) and.
The phase converter has a retard chamber (201) and an advance chamber (202).
The hydraulic oil supply source supplies hydraulic oil to the retard chamber and the advance chamber.
The hydraulic oil control unit controls the hydraulic oil supplied from the hydraulic oil supply source to the retard chamber and the advance chamber.
The oil discharge portion discharges the hydraulic oil from the retard chamber or the advance chamber.

The retard oil supply passage connects the hydraulic oil supply source and the retard chamber via the hydraulic oil control unit.
The advance oil supply passage connects the operation oil supply source and the advance chamber via the operation oil control unit.
The drain oil passage connects the retard angle chamber and the advance angle chamber to the oil discharge portion.
The recycle oil passage connects the drain oil passage to the retard angle supply oil passage and the advance angle supply oil passage. As a result, the hydraulic oil from the retard chamber and the advance chamber can be reused.

The recycle check valve allows only the flow of the hydraulic oil from the drain oil passage side to the retard supply oil passage side and the advance supply oil passage side in the recycle oil passage. As a result, the flow of hydraulic oil from each supply oil passage side to the drain oil passage side, that is, backflow can be suppressed. Therefore, the responsiveness of the valve timing adjustment device can be improved.
In the present invention, the recycle oil passage is connected to the drain oil passage inside the hydraulic oil control section. Therefore, the opening for the recycled oil passage can be reduced by forming the recycled oil passage inside the hydraulic oil control unit, and in the hydraulic oil control unit, the drain oil passage is formed in the retard opening and the advance opening. By doing so, the opening for the drain oil passage can be reduced. As a result, it is possible to reduce the number of openings formed on the outer wall of the hydraulic oil control section for each oil passage. Therefore, the physique of the hydraulic oil control section can be reduced in the direction in which the openings are arranged.
In the first aspect of the present invention, the hydraulic oil control unit has a tubular sleeve (400) and a tubular spool (60) provided so as to be capable of reciprocating inside the sleeve. A recycling check valve is provided on the sleeve.
In the second aspect of the present invention, the hydraulic oil control unit includes a tubular sleeve (400), a tubular spool (60) provided inside the sleeve and forming a specific space (Ss) with the sleeve, What is the drain opening (Od1) that is connected to a specific space in the drain oil passage and extends from the specific space in the radial direction of the sleeve or the spool, and the drain opening that is connected to the specific space in the recycling oil passage and is from the specific space It has a recycling opening (Ore) formed to extend to the opposite side. The recycling oil passage is connected to the drain oil passage in the specific space.

Sectional drawing which shows the valve timing adjustment apparatus by 1st Embodiment. II-II sectional view taken on the line of FIG. Sectional drawing which shows the hydraulic oil control valve of the valve timing adjustment apparatus by 1st Embodiment. IV-IV sectional view taken on the line of FIG. FIG. 3 is a perspective view showing an inner sleeve of the valve timing adjusting device according to the first embodiment. The perspective view which shows the retardation supply check valve of the valve timing adjustment apparatus by 1st Embodiment. FIG. 4 is a cross-sectional view showing the hydraulic oil control valve of the valve timing adjustment device according to the first embodiment, when the spool is at one end of the stroke section. FIG. 3 is a schematic view showing the valve timing adjusting device according to the first embodiment, when the spool is at one end of a stroke section. FIG. 3 is a cross-sectional view showing the hydraulic oil control valve of the valve timing adjustment device according to the first embodiment, and is a diagram when the spool is at the intermediate position of the stroke section. FIG. 3 is a schematic view showing the valve timing adjusting device according to the first embodiment, when the spool is at the intermediate position of the stroke section. FIG. 4 is a cross-sectional view showing the hydraulic oil control valve of the valve timing adjustment device according to the first embodiment, when the spool is at the other end of the stroke section. FIG. 3 is a schematic view showing the valve timing adjusting device according to the first embodiment, when the spool is at the other end of the stroke section. Sectional drawing which shows the valve timing adjustment apparatus by 2nd Embodiment. The top view which shows the reed valve of the valve timing adjustment apparatus by 2nd Embodiment. The development view showing the retarded angle supply check valve of the valve timing adjusting device by a 3rd embodiment. Sectional drawing which shows the retardation supply check valve of the valve timing adjustment apparatus by 3rd Embodiment. The development view which shows the retardation supply check valve of the valve timing adjusting device by a 4th embodiment.

Hereinafter, valve timing adjusting devices according to embodiments of the present invention will be described with reference to the drawings. In addition, in a plurality of embodiments, the substantially same components are designated by the same reference numerals, and the description thereof will be omitted. In addition, in the plurality of embodiments, substantially the same constituent parts have the same or similar effects.

(First embodiment)
The valve timing adjusting device according to the first embodiment is shown in FIGS. The valve timing adjusting device 10 changes the rotational phase of the camshaft 3 with respect to the crankshaft 2 of the engine 1 as an internal combustion engine, so that the intake valve 4 of the intake valve 4 or the exhaust valve 5 of which the camshaft 3 is driven to open and close. It adjusts the valve timing. The valve timing adjusting device 10 is provided in the power transmission path from the crankshaft 2 to the camshaft 3. The crankshaft 2 corresponds to a “drive shaft”. The cam shaft 3 corresponds to a "driven shaft". The intake valve 4 and the exhaust valve 5 correspond to "valves".

The configuration of the valve timing adjusting device 10 will be described with reference to FIGS.
The valve timing adjustment device 10 includes a phase conversion unit PC, a hydraulic oil supply source OS, a hydraulic oil control unit OC, an oil discharge unit OD, a retard angle supply oil passage RRs, an advance angle supply oil passage RAs, and a delay angle as a drain oil passage. A drain oil passage RRd, an advance drain oil passage RAd, a recycle oil passage Rre, a retard supply check valve 71, an advance supply check valve 72, a recycle check valve 81 and the like are provided.

The phase conversion unit PC has a housing 20 and a vane rotor 30.
The housing 20 has a gear portion 21 and a case 22. The case 22 has a tubular portion 221, and plate portions 222 and 223. The tubular portion 221 is formed in a tubular shape. The plate portion 222 is formed integrally with the tubular portion 221 so as to close one end of the tubular portion 221. The plate portion 223 is provided so as to close the other end of the tubular portion 221. As a result, a space 200 is formed inside the housing 20. The plate portion 223 is fixed to the tubular portion 221 with the bolt 12. The gear portion 21 is formed on the outer edge portion of the plate portion 223.

The plate portion 223 is fitted to the end portion of the cam shaft 3. The cam shaft 3 rotatably supports the housing 20. The chain 6 is wound around the gear portion 21 and the crankshaft 2. The gear portion 21 rotates in conjunction with the crankshaft 2.
The case 22 has a plurality of partition walls 23 that project radially inward from the tubular portion 221. At the center of the plate portion 222 of the case 22, an opening 24 that opens to the space outside the case 22 is formed. The opening 24 is located on the opposite side of the vane rotor 30 from the cam shaft 3.

The vane rotor 30 has a boss 31 and a plurality of vanes 32. The boss 31 has a tubular shape and is fixed to the end of the cam shaft 3. The vane 32 projects between the partition walls 23 from the boss 31 outward in the radial direction. The space 200 inside the housing 20 is partitioned by a vane 32 into a retard chamber 201 and an advance chamber 202. That is, the housing 20 forms the retard chamber 201 and the advance chamber 202 with the vane rotor 30. The retard chamber 201 is located on one side in the circumferential direction with respect to the vane 32. The advance chamber 202 is located on the other side in the circumferential direction with respect to the vane 32. The vane rotor 30 relatively rotates in the retard direction or the advance direction with respect to the housing 20 according to the hydraulic pressure of the retard chamber 201 and the advance chamber 202.

In the present embodiment, the hydraulic oil control unit OC is the hydraulic oil control valve 11. The hydraulic oil control valve 11 includes a sleeve 400, a spool 60 and the like.

In the present embodiment, the hydraulic oil control valve 11 is provided at the center of the housing 20 and the vane rotor 30 (see FIGS. 1 and 2). That is, the hydraulic oil control valve 11 is provided so that at least a part thereof is located inside the housing 20.
The sleeve 400 has an outer sleeve 40 and an inner sleeve 50.
The outer sleeve 40 is formed in a substantially cylindrical shape from a material having a relatively high hardness including iron, for example. The outer sleeve 40 has an inner peripheral wall formed into a substantially cylindrical surface.
As shown in FIG. 3, a screw portion 41 is formed on the outer peripheral wall of one end of the outer sleeve 40. On the other end side of the outer sleeve 40, a locking portion 49 is formed which extends annularly outward from the outer peripheral wall in the radial direction.

A shaft hole portion 100 and a supply hole portion 101 are formed at an end portion of the camshaft 3 on the valve timing adjusting device 10 side. The shaft hole portion 100 is formed so as to extend in the axial direction of the cam shaft 3 from the center of the end surface of the cam shaft 3 on the valve timing adjusting device 10 side. The supply hole portion 101 is formed so as to extend radially inward from the outer wall of the cam shaft 3 and communicate with the shaft hole portion 100.

On the inner wall of the shaft hole portion 100 of the cam shaft 3, a shaft side screw portion 110 that can be screwed to the screw portion 41 of the outer sleeve 40 is formed.
The outer sleeve 40 passes through the inside of the boss 31 of the vane rotor 30, and is fixed to the cam shaft 3 so that the screw portion 41 is coupled to the shaft side screw portion 110 of the cam shaft 3. At this time, the locking portion 49 locks the end surface of the boss 31 of the vane rotor 30 on the side opposite to the cam shaft 3. As a result, the vane rotor 30 is fixed to the cam shaft 3 so as to be sandwiched between the cam shaft 3 and the locking portion 49. In this way, the outer sleeve 40 is provided at the center of the vane rotor 30.

In the present embodiment, the hydraulic oil supply source OS is the oil pump 8. The oil discharge portion OD is the oil pan 7. The oil pump 8 is connected to the supply hole portion 101. The oil pump 8 pumps up the hydraulic oil stored in the oil pan 7 and supplies it to the supply hole portion 101. As a result, the hydraulic oil flows into the shaft hole portion 100.

The inner sleeve 50 is formed in a substantially cylindrical shape from a material having a relatively low hardness, such as aluminum. That is, the inner sleeve 50 is made of a material having a hardness lower than that of the outer sleeve 40. The inner sleeve 50 has an inner peripheral wall and an outer peripheral wall formed in a substantially cylindrical surface shape. The inner sleeve 50 has a surface subjected to a surface hardening treatment such as alumite, and has a surface layer having a hardness higher than that of the base material on the surface.

As shown in FIG. 3, the inner sleeve 50 is provided inside the outer sleeve 40 so that the outer peripheral wall fits the inner peripheral wall of the outer sleeve 40. The inner sleeve 50 is immovable relative to the outer sleeve 40.

A sleeve sealing portion 51 is provided at one end of the inner sleeve 50. The sleeve sealing portion 51 closes one end of the inner sleeve 50.

The spool 60 is formed of, for example, metal into a substantially cylindrical shape.
The spool 60 is provided inside the inner sleeve 50 so that the outer peripheral wall slides on the inner peripheral wall of the inner sleeve 50 and can reciprocate in the axial direction.

A spool sealing portion 62 is provided at one end of the spool 60. The spool sealing portion 62 closes one end of the spool 60.

A variable volume space Sv is formed between the sleeve sealing portion 51 inside the inner sleeve 50 and the other end of the spool 60. The volume of the variable volume space Sv changes when the spool 60 moves in the axial direction with respect to the inner sleeve 50. That is, the sleeve sealing portion 51 forms a variable volume space Sv having a variable volume with the spool 60.

A spring 63 is provided in the variable volume space Sv. The spring 63 is a so-called coil spring, one end of which is in contact with the sleeve sealing portion 51 and the other end of which is in contact with the other end of the spool 60. The spring 63 biases the spool 60 to the side opposite to the sleeve sealing portion 51.

A locking portion 59 is provided on the inner side in the radial direction of the other end of the outer sleeve 40. The locking portion 59 is formed in a cylindrical shape with a bottom, and the outer peripheral wall thereof is provided so as to fit into the inner peripheral wall of the outer sleeve 40. A hole is formed at the center of the bottom of the locking portion 59, and the spool sealing portion 62 is located inside the hole.

The locking portion 59 can lock one end of the spool 60 by the bottom portion. The locking portion 59 can regulate the movement of the spool 60 to the opposite side of the spool sealing portion 51 of the spool 60. As a result, the spool 60 is prevented from falling off from the inner side of the inner sleeve 50.
The spool 60 is axially movable from a position where it abuts against the locking portion 59 to a position where it abuts against the sleeve sealing portion 51. That is, the movable range with respect to the sleeve 400 is from the position in contact with the locking portion 59 (see FIGS. 3 and 7) to the position in contact with the sleeve sealing portion 51 (see FIG. 11). Hereinafter, the movable range of the spool 60 will be referred to as a "stroke section".

As shown in FIG. 3, an outer diameter of the end portion of the inner sleeve 50 on the sleeve sealing portion 51 side is smaller than an inner diameter of the outer sleeve 40. As a result, a cylindrical space St1 that is a substantially cylindrical space is formed between the outer peripheral wall of the end portion of the inner sleeve 50 on the sleeve sealing portion 51 side and the inner peripheral wall of the outer sleeve 40.
Further, the inner sleeve 50 is formed with an annular recess Ht. The annular recess Ht is formed so as to be annularly recessed radially inward from a position corresponding to the locking portion 49 on the outer peripheral wall of the inner sleeve 50. As a result, an annular space St2, which is an annular space, is formed between the annular recess Ht and the inner peripheral wall of the outer sleeve 40.
Further, the inner sleeve 50 is formed with a flow path groove portion 52. The flow channel groove portion 52 is formed so as to be recessed radially inward from the outer peripheral wall of the inner sleeve 50 and extend in the axial direction of the inner sleeve 50 (see FIGS. 3 and 5). The flow channel groove portion 52 forms an axial oil supply passage RsA. That is, the axial oil supply passage RsA is formed so as to extend in the axial direction of the sleeve 400 at the interface T1 between the outer sleeve 40 and the inner sleeve 50. One end of the axial supply oil passage RsA is connected to the cylindrical space St1 and the other end is connected to the annular space St2.

Further, the inner sleeve 50 is formed with restriction groove portions 511 and 512. The restriction groove 511 is formed so as to be annularly recessed radially outward from a position corresponding to the end of the cylindrical space St1 on the inner peripheral wall of the inner sleeve 50. The restriction groove portion 512 is formed so as to be annularly recessed radially outward from a position corresponding to the annular recess Ht on the inner peripheral wall of the inner sleeve 50.

Further, the inner sleeve 50 is formed with a movement restricting portion 513. The movement restricting portion 513 is formed between the restriction groove portion 511 and the restriction groove portion 512 so as to be annularly recessed radially inward from the outer peripheral wall of the inner sleeve 50. Therefore, a part of the movement restricting portion 513 in the circumferential direction is connected to the flow channel groove portion 52.

The sleeve 400 has a retard angle supply opening portion ORs, an advance angle supply opening portion OAs, a retard angle opening portion OR, an advance angle opening portion OA, and a recycling opening portion Ore.
The retard angle supply opening portion ORs is formed so as to extend in the radial direction of the sleeve 400 and connect the restriction groove portion 511 of the inner sleeve 50 to the cylindrical space St1 and the axial supply oil passage RsA. In addition, a plurality of retarded angle supply openings ORs are formed in the circumferential direction of the inner sleeve 50.
The advance supply opening OAs is formed so as to extend in the radial direction of the sleeve 400 and connect the restriction groove 512 of the inner sleeve 50 to the annular space St2 and the axial supply oil passage RsA. A plurality of advance supply openings OAs are formed in the circumferential direction of the inner sleeve 50.

The retard opening OR is formed to extend in the radial direction of the sleeve 400 and connect the space inside the inner sleeve 50 and the space outside the outer sleeve 40. A plurality of retarded angle openings OR are formed in the circumferential direction of the sleeve 400. The retard opening OR is in communication with the retard chamber 201 via the retard oil passage 301.
The advance opening OA is formed so as to extend in the radial direction of the sleeve 400 and connect the space inside the inner sleeve 50 and the space outside the outer sleeve 40. The advance opening OA is formed on the locking portion 49 side with respect to the retard opening OR. In addition, a plurality of advance openings OA are formed in the circumferential direction of the sleeve 400. The advance opening OA communicates with the advance chamber 202 via the advance oil passage 302.

The recycling opening Ore is formed so as to extend in the radial direction of the sleeve 400 and connect the space inside the inner sleeve 50 to the movement restricting portion 513 and the axial oil supply passage RsA. Four recycling openings Ore are formed in the circumferential direction of the inner sleeve 50 (see FIG. 4).

The spool 60 has a retard angle supply recess HRs, a retard angle drain recess HRd, an advance angle drain recess HAd, an advance angle supply recess HAs, and drain openings Od1 and Od2.
The retard angle supply recess HRs, the retard angle drain recess HRd, the advance angle drain recess HAd, and the advance angle supply recess HAs are each formed annularly so as to be recessed radially inward from the outer peripheral wall of the spool 60. The retard angle supply recess HRs, the retard angle drain recess HRd, the advance angle drain recess HAd, and the advance angle supply recess HAs are formed in this order in the axial direction of the spool 60. Further, the retard angle drain concave portion HRd and the advance angle drain concave portion HAd are integrally formed. The retarded angle drain recess HRd and the advanced angle drain recess HAd form a specific space Ss with the inner peripheral wall of the inner sleeve 50. That is, the spool 60 forms a specific space Ss with the sleeve 400.

The drain opening Od1 is formed so as to communicate the space inside the spool 60 with the retard angle drain recess HRd and the advance angle drain recess HAd, that is, the specific space Ss. The drain opening Od2 is formed so that the inner space and the outer space communicate with each other at the end of the spool 60 on the spool sealing portion 62 side. Two drain openings Od1 are formed at equal intervals in the circumferential direction of the spool 60 (see FIG. 4). For example, four drain openings Od2 are formed at equal intervals in the circumferential direction of the spool 60.

The retard oil supply passage RRs connects the oil pump 8 and the retard chamber 201 via the hydraulic oil control valve 11. The advance supply oil passage RAs connects the oil pump 8 and the advance chamber 202 via the hydraulic oil control valve 11. The retarded angle drain oil passage RRd serving as a drain oil passage connects the retarded angle chamber 201 and the oil pan 7. The advance drain oil passage RAd as the drain oil passage connects the advance chamber 202 and the oil pan 7.

The retard angle supply oil passage RRs includes the supply hole portion 101, the shaft hole portion 100, the cylindrical space St1, the axial direction supply oil passage RsA, the retard angle supply opening portion ORs, the restriction groove portion 511, the retard angle supply concave portion HRs, and the retard angle opening. The oil pump 8 and the retard chamber 201 are connected via the section OR and the retard oil passage 301.
The advance oil supply passage RAs includes the supply hole 101, the shaft hole 100, the cylindrical space St1, the axial supply oil passage RsA, the advance supply opening OAs, the restriction groove 512, the advance supply recess HAs, and the advance opening. The oil pump 8 and the advance chamber 202 are connected via the section OA and the advance oil passage 302.
The retarded angle oil passage RRd connects the retarded angle chamber 201 and the oil pan 7 via the retarded angle oil passage 301, the retarded angle opening portion OR, the retarded angle drain concave portion HRd, and the drain opening portions Od1 and Od2. There is.
The advance angle oil passage RAd connects the advance angle chamber 202 and the oil pan 7 via the advance angle oil passage 302, the advance angle opening portion OA, the advance angle drain concave portion HAd, and the drain opening portions Od1 and Od2. There is.
As described above, the retard supply oil passage RRs, the advance supply oil passage RAs, the retard drain oil passage RRd, and the advance drain oil passage RAd are partially formed inside the hydraulic oil control valve 11.
The axial supply oil passage RsA is formed so as to extend in the axial direction of the sleeve 400 in the advance supply oil passage RAs. That is, the sleeve 400 has an axial supply oil passage RsA extending in the axial direction of the sleeve 400 in the advance supply oil passage RAs.

The recycle oil passage Rre connects the retard angle drain oil passage RRd and the advance angle drain oil passage RAd as the drain oil passage to the retard angle supply oil passage RRs and the advance angle supply oil passage RAs.
As shown in FIGS. 3 and 4, the recycle oil passage Rre extends from the specific space Ss through the recycle opening Ore and the movement restricting portion 513 to the retard angle supply oil passage RRs and the advance angle supply oil passage RAs, that is, the axial direction. It is connected to the supply oil passage RsA.
The retard angle drain oil passage RRd and the advance angle drain oil passage RAd as the drain oil passages include a retard angle oil passage 301, a retard angle opening OR, an advance angle oil passage 302, an advance angle opening OA, a specific space Ss, and a drain opening. It is connected to the space inside the spool 60 via the portion Od1.
As shown in FIG. 4, the drain opening Od1 is formed so as to connect to the specific space Ss in the drain oil passage and extend from the specific space Ss in the radial direction of the sleeve 400 or the spool 60. The recycling opening Ore is formed so as to connect to the specific space Ss in the recycling oil passage Rre and extend from the specific space Ss to the side opposite to the drain opening Od1. The recycle oil passage Rre is connected to the retard angle drain oil passage RRd and the advance angle drain oil passage RAd in the specific space Ss.

As shown in FIGS. 3 and 4, the drain opening Od1 is formed so that at least a portion thereof overlaps the recycling opening Ore in the axial direction of the sleeve 400 or the spool 60.
Further, the drain opening Od1 is formed in the spool 60 so as to extend from the specific space Ss to the inner side in the radial direction of the sleeve 400 or the spool 60.
Further, the recycle opening Ore is formed in the inner sleeve 50 so as to extend from the specific space Ss to the outside in the radial direction of the sleeve 400 or the spool 60.

When the spool 60 is in contact with the locking portion 59 (see FIGS. 3, 7, and 8), that is, when the spool 60 is located at one end of the stroke section, the spool 60 opens the retard opening OR. Therefore, the oil pump 8 includes the supply hole portion 101, the shaft hole portion 100, the cylindrical space St1, the axial supply oil passage RsA, the retard supply opening portion ORs, the restriction groove portion 511, and the retard groove portion 511 of the retard supply oil passage RRs. It communicates with the retard chamber 201 via the angle supply recess HRs, the retard opening OR, and the retard oil passage 301. As a result, hydraulic oil can be supplied from the oil pump 8 to the retard chamber 201 via the retard supply passage RRs.
At this time, the advance chamber 202 is connected to the oil pan 7 via the advance oil passage 302 of the advance drain oil passage RAd, the advance opening OA, the advance drain recess HAd, and the drain openings Od1 and Od2. Communicate. As a result, hydraulic oil can be discharged from the advance chamber 202 to the oil pan 7 via the advance drain oil passage RAd.

When the spool 60 is located between the locking portion 59 and the sleeve sealing portion 51 (see FIGS. 9 and 10), that is, when the spool 60 is located in the middle of the stroke section, the oil pump 8 moves forward. Supply hole 101 of axial supply oil passage RAs, shaft hole 100, cylindrical space St1, axial supply oil passage RsA, advance supply opening OAs, restriction groove 512, advance supply recess HAs, advance opening OA. , And communicates with the advance chamber 202 via the advance oil passage 302. At this time, the oil pump 8 and the retard chamber 201 communicate with each other through the retard oil supply passage RRs. As a result, hydraulic oil can be supplied from the oil pump 8 to the retard chamber 201 and the advance chamber 202 via the retard supply oil passage RRs and the advance supply oil passage RAs. However, since the retard drain oil passage RRd and the advance drain oil passage RAd are closed, that is, blocked by the spool 60, the hydraulic oil is transferred from the retard chamber 201 and the advance chamber 202 to the oil pan 7. Not discharged.

When the spool 60 is in contact with the sleeve sealing portion 51 (see FIGS. 11 and 12 ), that is, when the spool 60 is located at the other end of the stroke section, the retard chamber 201 is in the retard drain oil passage. It communicates with the oil pan 7 via the retard oil passage 301 of the RRd, the retard opening OR, the retard drain recess HRd, and the drain openings Od1 and Od2. At this time, the oil pump 8 and the advance chamber 202 communicate with each other through the advance oil supply passage RAs. As a result, hydraulic oil can be discharged from the retard chamber 201 to the oil pan 7 via the retard drain oil passage RRd, and the advance chamber 202 from the oil pump 8 via the advance supply oil passage RAs. Can be supplied with hydraulic oil.

A filter 58 is provided inside the end portion of the outer sleeve 40 on the sleeve sealing portion 51 side, that is, in the middle of the retard angle supply oil passage RRs and the advance angle supply oil passage RAs. The filter 58 is, for example, a disc-shaped mesh. The filter 58 can collect foreign matter contained in the hydraulic oil. Therefore, it is possible to prevent foreign matter from flowing downstream of the filter 58, that is, on the side opposite to the oil pump 8.

The retarded supply check valve 71 is formed in a substantially cylindrical shape, for example, by bending a rectangular thin metal plate so that its longitudinal direction is along the circumferential direction. FIG. 5 is a perspective view of the retard angle supply check valve 71.
The retarded supply check valve 71 has an overlapping portion 700.
The overlapping portion 700 is formed at one end portion in the circumferential direction of the retarded angle supply check valve 71. The overlapping portion 700 is formed so as to overlap the outside in the radial direction of the other end portion of the retarded angle supply check valve 71 in the circumferential direction (see FIG. 5 ).

The retard supply check valve 71 is provided in the restriction groove portion 511. The retarded supply check valve 71 is provided in the restriction groove portion 511 so as to be elastically deformable in the radial direction. The retard supply check valve 71 is provided inside the inner sleeve 50 in the radial direction with respect to the retard supply opening ORs. The retard supply check valve 71 is provided in the restriction groove portion 511, and when the hydraulic oil does not flow in the retard supply oil passage RRs, that is, when the external force is not applied, the overlapping portion 700 is positioned in the other circumferential direction. It is in a state of overlapping the end.

When the working oil flows from the retard supply opening ORs side to the retard supply recess HRs side in the retard supply passage RRs, the retard supply check valve 71 is configured such that the outer peripheral wall thereof is pushed by the hydraulic oil and contracts radially inward. That is, it deforms so that the inner diameter is reduced. As a result, the outer peripheral wall of the retard angle supply check valve 71 is separated from the retard angle supply opening portion ORs, and the hydraulic oil can flow toward the retard angle supply recess HRs side via the retard angle supply check valve 71. At this time, the overlapping portion 700 is in a state in which the overlapping portion 700 and the other end of the retarded angle supply check valve 71 are expanded while the length of the overlapping range is maintained and a part of the overlapping portion 700 is maintained.

When the flow rate of the hydraulic oil flowing through the retard oil supply passage RRs becomes equal to or less than a predetermined value, the retard supply check valve 71 deforms so as to expand outward in the radial direction, that is, the inner diameter increases. Further, when the hydraulic oil flows from the retard angle supply concave portion HRs side toward the retard angle supply opening portion ORs side, the inner peripheral wall of the retard angle supply check valve 71 is pushed radially outward by the hydraulic oil to the retard angle supply opening portion ORs. Abut. As a result, the flow of hydraulic oil from the retard angle supply recess HRs side to the retard angle supply opening ORs side is restricted.

In this way, the retard supply check valve 71 functions as a check valve, permits the flow of hydraulic oil from the retard supply opening ORs side to the retard supply recess HRs side, and from the retard supply recess HRs side. It is possible to regulate the flow of hydraulic oil toward the retard angle supply opening portion ORs. That is, the retard supply check valve 71 is provided on the oil pump 8 side with respect to the spool 60 of the hydraulic oil control valve 11 in the retard supply oil passage RRs, so that the hydraulic oil from the oil pump 8 side to the retard chamber 201 side Allow only flow.

The advance supply check valve 72, like the retard supply check valve 71, is formed in a substantially cylindrical shape by bending, for example, a rectangular thin metal plate so that its longitudinal direction is along the circumferential direction. The configuration of the advance angle supply check valve 72 is the same as that of the retard angle supply check valve 71, and thus detailed description thereof will be omitted.

The advance supply check valve 72 is provided in the restriction groove portion 512. The advance supply check valve 72 is provided in the restriction groove portion 512 so as to be elastically deformable in the radial direction. The advance supply check valve 72 is provided radially inside the inner sleeve 50 with respect to the advance supply opening portion OAs. The advance supply check valve 72 is provided in the restriction groove portion 512, and when the working oil does not flow in the advance supply oil passage RAs, that is, when no external force is applied, the overlapping portion 700 has the other circumferential position. It is in a state of overlapping the end.

When the hydraulic oil flows from the advance supply opening OAS side to the advance supply recess HAs side in the advance supply oil passage RAs, the advance supply check valve 72 is configured such that the outer peripheral wall is pushed by the hydraulic oil and contracts radially inward. That is, it deforms so that the inner diameter is reduced. As a result, the outer peripheral wall of the advance angle supply check valve 72 is separated from the advance angle supply opening portion OAs, and the hydraulic oil can flow toward the advance angle supply recess HAs side via the advance angle supply check valve 72. At this time, the overlapping portion 700 is in a state in which the overlapping portion 700 and the other end portion of the advance angle supply check valve 72 are expanded and the length of the overlapping portion is partially maintained.

When the flow rate of the hydraulic oil flowing through the advance oil supply passage RAs becomes equal to or smaller than a predetermined value, the advance supply check valve 72 is deformed so as to expand outward in the radial direction, that is, the inner diameter increases. Further, when the working oil flows from the advance supply recess HAs side to the advance supply opening OAS side, the inner peripheral wall of the advance supply check valve 72 is pushed radially outward by the working oil to the advance supply opening OAs. Abut. As a result, the flow of hydraulic oil from the advance angle supply recess HAs side to the advance angle supply opening OAs side is restricted.

In this way, the advance supply check valve 72 functions as a check valve, allows the flow of hydraulic oil from the advance supply opening OAs side to the advance supply recess HAs side, and from the advance supply recess HAs side. It is possible to regulate the flow of hydraulic oil toward the advance supply opening portion OAs. That is, the advance supply check valve 72 is provided on the oil pump 8 side with respect to the spool 60 of the hydraulic oil control valve 11 in the advance supply oil passage RAs, so that the advance oil supply valve RAs supplies the operation oil from the oil pump 8 side to the advance chamber 202 side. Allow only flow.

The restricting groove portions 511 and 512 can restrict the movement of the retard angle supply check valve 71 and the advance angle supply check valve 72 in the axial direction, respectively.
As shown in FIG. 4, five advance supply openings OAs are formed in the inner sleeve 50. The advance angle supply openings OAs are formed in approximately half of the entire circumferential range of the inner sleeve 50. That is, the advance angle supply openings OAs are formed in a specific portion in the circumferential direction of the inner sleeve 50. Therefore, when the hydraulic oil flows from the advance supply opening OAs side to the advance supply recess HAs side, the advance supply check valve 72 is moved by the hydraulic oil to the opposite side of the restriction groove 512 from the advance supply opening OAs. It is pressed. As a result, it is possible to prevent the advance angle supply check valve 72 from falling out of the restriction groove portion 512. Therefore, the restriction groove portion 512 can maintain the function of restricting the axial movement of the advance angle supply check valve 72.

Five retard angle supply openings ORs are also formed in the inner sleeve 50, similarly to the advance angle supply openings OAs. The retard angle supply opening portion ORs is formed in approximately a half range of the entire circumferential range of the inner sleeve 50. That is, the retard angle supply opening portion ORs is formed in a biased manner at a specific portion in the circumferential direction of the inner sleeve 50. Therefore, when the hydraulic oil flows from the retard angle supply opening portion ORs side to the retard angle supply concave portion HRs side, the retard angle supply check valve 71 is moved to the opposite side of the retard groove supply portion ORs of the restriction groove portion 511 by the hydraulic oil. It is pressed. This can prevent the retard supply check valve 71 from falling off the restriction groove portion 511. Therefore, the restriction groove portion 511 can maintain the function of restricting the movement of the retarded angle supply check valve 71 in the axial direction.

The recycle check valve 81 is formed in a substantially cylindrical shape by bending, for example, a rectangular thin metal plate so that the longitudinal direction is along the circumferential direction, like the retarded angle supply check valve 71. The recycle check valve 81 is formed so that its outer diameter is larger than that of the retarded angle supply check valve 71. The structure of the recycle check valve 81 is the same as that of the retard angle supply check valve 71 except for the difference in the outer diameter, and therefore the detailed description of the structure is omitted.

The recycle check valve 81 is provided on the movement restriction unit 513, that is, on the recycle oil passage Rre. The recycle check valve 81 is provided in the movement restricting portion 513 so as to be elastically deformable in the radial direction. The recycle check valve 81 is provided radially outside the inner sleeve 50 with respect to the recycle opening Ore. The recycle check valve 81 is provided in the movement restricting portion 513, and in a state where the hydraulic oil does not flow in the recycle oil passage Rre, that is, a state where no external force is applied, the overlapping portion 700 is located at the other end portion in the circumferential direction. It is in a state of overlapping.

When the working oil flows in the recycling oil passage Rre from the recycling opening Ore side to the axial supply oil passage RsA side, the recycle check valve 81 is configured such that the inner peripheral wall is pushed by the working oil and spreads outward in the radial direction. It transforms as it expands. As a result, the inner peripheral wall of the recycle check valve 81 is separated from the recycle opening Ore, and the working oil can flow to the axial oil supply passage RsA side via the recycle check valve 81. At this time, the overlapping portion 700 is in a state in which the overlapping portion 700 and the other end of the recycle check valve 81 are reduced in length while partially overlapping.

When the flow rate of the hydraulic oil flowing through the recycle oil passage Rre becomes equal to or less than a predetermined value, the recycle check valve 81 deforms so as to contract inward in the radial direction, that is, the inner diameter decreases. Further, when the working oil flows from the axial supply oil passage RsA side to the recycle opening Ore side, the outer peripheral wall of the recycle check valve 81 is pushed radially inward by the working oil and contacts the recycle opening Ore. As a result, the flow of hydraulic oil from the axial supply oil passage RsA side to the recycle opening Ore side is restricted.

In this way, the recycle check valve 81 functions as a check valve, allows the flow of hydraulic oil from the recycle opening Ore side to the axial supply oil passage RsA side, and recycles the opening from the axial supply oil passage RsA side. It is possible to regulate the flow of hydraulic oil to the section Ore side. That is, the recycle check valve 81 allows only the flow of the hydraulic oil from the drain oil passage side to the retard supply oil passage RRs side and the advance supply oil passage RAs side in the recycle oil passage Rre.
The movement restricting portion 513 can restrict the movement of the recycling check valve 81 in the axial direction.

A linear solenoid 9 is provided on the side of the spool 60 opposite to the cam shaft 3. The linear solenoid 9 is provided so as to contact the spool sealing portion 62. When energized, the linear solenoid 9 presses the spool 60 toward the camshaft 3 side against the biasing force of the spring 63 via the spool sealing portion 62. As a result, the spool 60 changes its axial position with respect to the sleeve 400 in the stroke section.
The variable volume space Sv communicates with the retard angle drain oil passage RRd and the advance angle drain oil passage RAd. Therefore, the variable volume space Sv is opened to the atmosphere via the drain opening Od2 of the retard angle drain oil passage RRd and the advance angle drain oil passage RAd. As a result, the pressure in the variable volume space Sv can be made equal to the atmospheric pressure. Therefore, it is possible to smoothly move the spool 60 in the axial direction.

Next, changes in the flow of hydraulic oil depending on the position of the spool 60 with respect to the sleeve 400 will be described with reference to FIGS.

As shown in FIGS. 7 and 8, when the spool 60 is in contact with the locking portion 59, that is, when the spool 60 is located at one end of the stroke section, the hydraulic oil is retarded from the oil pump 8. It is supplied to the retard chamber 201 via the supply oil passage RRs. At this time, the hydraulic oil is discharged from the advance chamber 202 to the oil pan 7 via the advance drain oil passage RAd. Further, a part of the hydraulic oil flowing through the advance drain oil passage RAd is returned to the axial supply oil passage RsA side and the retard supply oil passage RRs side via the recycle oil passage Rre. As a result, the hydraulic oil discharged from the advance chamber 202 can be reused. At this time, the recycle check valve 81 suppresses the reverse flow of the recycle oil passage Rre from the axial supply oil passage RsA side to the drain oil passage side.

As shown in FIGS. 9 and 10, when the spool 60 is located between the locking portion 59 and the sleeve sealing portion 51, that is, when the spool 60 is located in the middle of the stroke section, the hydraulic oil is The oil is supplied from the oil pump 8 to the retard chamber 201 via the retard oil passage RRs. At this time, the hydraulic oil is supplied from the oil pump 8 to the advance chamber 202 via the advance supply oil passage RAs. At this time, since the delay angle drain oil passage RRd and the advance angle drain oil passage RAd are closed by the spool 60, the working oil does not flow into the drain oil passage, and the working oil passes through the recycle oil passage Rre. It is not returned to the direction supply oil passage RsA side.

As shown in FIGS. 11 and 12, when the spool 60 is in contact with the sleeve sealing portion 51, that is, when the spool 60 is located at the other end of the stroke section, the hydraulic oil is advanced from the oil pump 8. It is supplied to the advance chamber 202 via the corner supply oil passage RAs. At this time, the hydraulic oil is discharged from the retard chamber 201 to the oil pan 7 via the retard drain oil passage RRd. Furthermore, a part of the hydraulic oil flowing through the retarded angle drain oil passage RRd is returned to the axial supply oil passage RsA side and the advanced supply oil passage RAs side via the recycle oil passage Rre. Thereby, the hydraulic oil discharged from the retard chamber 201 can be reused. At this time, the recycle check valve 81 suppresses the reverse flow of the recycle oil passage Rre from the axial supply oil passage RsA side to the drain oil passage side.

The present embodiment further includes a lock pin 33 (see FIGS. 1 and 2). The lock pin 33 is formed in a cylindrical shape with a bottom, and is housed in a housing hole 321 formed in the vane 32 so as to be capable of reciprocating in the axial direction. A spring 34 is provided inside the lock pin 33. The spring 34 urges the lock pin 33 toward the plate portion 222 side of the case 22. A fitting recess 25 is formed on the vane 32 side of the plate portion 222 of the case 22.

The lock pin 33 can be fitted into the fitting recess 25 when the vane rotor 30 is at the most retarded position with respect to the housing 20. When the lock pin 33 is fitted in the fitting recess 25, the relative rotation of the vane rotor 30 with respect to the housing 20 is restricted. On the other hand, when the lock pin 33 is not fitted in the fitting recess 25, the relative rotation of the vane rotor 30 with respect to the housing 20 is allowed.

A pin control oil passage 304 communicating with the advance chamber 202 is formed between the lock pin 33 of the vane 32 and the advance chamber 202 (see FIG. 2 ). The pressure of the hydraulic oil flowing from the advance chamber 202 into the pin control oil passage 304 acts in the direction in which the lock pin 33 withdraws from the fitting recess 25 against the biasing force of the spring 34.

In the valve timing adjusting device 10 configured as described above, when the working oil is supplied to the advance chamber 202, the working oil flows into the pin control oil passage 304, the lock pin 33 comes out of the fitting recess 25, and the housing The relative rotation of the vane rotor 30 with respect to 20 is allowed.

Next, the operation of the valve timing adjustment device 10 will be described. The valve timing adjusting device 10 presses the spool 60 of the hydraulic oil control valve 11 by driving the linear solenoid 9, and connects the hydraulic oil control valve 11 to the oil pump 8 and the retard chamber 201 while advancing the advance chamber 202. And the oil pan 7 are connected to each other in a first operating state, the oil pump 8 and the advance chamber 202 are connected to each other, and the retard chamber 201 and the oil pan 7 are connected to each other. It operates in a phase holding state in which the retard chamber 201 and the advancing chamber 202 are connected, and the retard chamber 201 and the advancing chamber 202 are shut off from the oil pan 7 and the phase of the phase conversion unit PC is held. Let

In the first operating state, while the hydraulic oil is supplied to the retard chamber 201 via the retard supply oil passage RRs, the hydraulic oil is supplied from the advance chamber 202 to the oil pan 7 via the advance drain oil passage RAd. Will be returned. Further, the hydraulic oil is returned from the advance drain oil passage RAd to the retard supply oil passage RRs via the recycle oil passage Rre.
In the second operating state, the working oil is supplied to the advance chamber 202 via the advance supply oil passage RAs, while the working oil is supplied from the retard chamber 201 to the oil pan 7 via the retard drain oil passage RRd. Will be returned. Further, the hydraulic oil is returned from the retarded drain oil passage RRd to the advanced supply oil passage RAs via the recycle oil passage Rre.
In the phase holding state, the hydraulic oil is supplied to the retard angle chamber 201 and the advance angle chamber 202 via the retard angle supply oil passage RRs and the advance angle supply oil passage RAs, while the retard angle chamber 201 and the advance angle chamber 202 operate. Oil discharge is regulated.

The valve timing adjustment device 10 sets the hydraulic oil control valve 11 in the first operating state when the rotation phase of the cam shaft 3 is on the advance side of the target value. As a result, the vane rotor 30 relatively rotates in the retard direction with respect to the housing 20, and the rotation phase of the cam shaft 3 changes to the retard side.
Further, the valve timing adjustment device 10 sets the hydraulic oil control valve 11 in the second operating state when the rotation phase of the cam shaft 3 is on the retard side with respect to the target value. As a result, the vane rotor 30 relatively rotates in the advance direction with respect to the housing 20, and the rotation phase of the cam shaft 3 changes to the advance side.
Further, the valve timing adjusting device 10 brings the hydraulic oil control valve 11 into the phase holding state when the rotation phase of the cam shaft 3 matches the target value. As a result, the rotational phase of the cam shaft 3 is maintained.

In the present embodiment, when the hydraulic oil control valve 11 is in the first operating state or the second operating state, the drain oil passage side is advanced to the retard supply oil passage RRs side or the advance supply oil passage RAs side via the recycle oil passage Rre. Hydraulic fluid is returned to. Thereby, the hydraulic oil discharged from the advance chamber 202 or the retard chamber 201 can be reused.
Further, when the hydraulic oil control valve 11 is in the first operating state or the second operating state, the recycle check valve 81 suppresses the reverse flow from each supply oil passage side to the drain oil passage side in the recycle oil passage Rre.

Further, in the present embodiment, even when the hydraulic oil control valve 11 is in the phase holding state, that is, when the phase of the phase conversion unit PC is held, hydraulic oil is supplied to the retard chamber 201 and the advance chamber 202. It is possible to supply. That is, when the phase of the phase conversion unit PC is maintained, the supply state of the hydraulic oil to the retard chamber 201 and the advance chamber 202 is maintained and air is sucked into the retard chamber 201 and the advance chamber 202. It is possible to suppress the phase deviation of the PC.

As described above, (1) the present embodiment is the valve timing adjustment device 10 that adjusts the valve timing of the intake valve 4 of the engine 1, including the phase conversion unit PC, the hydraulic oil supply source OS, and the hydraulic oil control unit. OC, oil discharge part OD, retard supply oil passage RRs, advance supply oil passage RAs, retard drain oil passage RRd as drain oil passage, advance drain oil passage RAd, recycle oil passage Rre, and recycle check valve 81. Equipped with.
The phase conversion unit PC has a retard chamber 201 and an advance chamber 202.
The hydraulic oil supply source OS supplies hydraulic oil to the retard chamber 201 and the advance chamber 202.
The hydraulic oil control unit OC controls the hydraulic oil supplied from the hydraulic oil supply source OS to the retard chamber 201 and the advance chamber 202.
The oil discharge part OD discharges the hydraulic oil from the retard chamber 201 or the advance chamber 202.

The retard oil supply passage RRs connects the hydraulic oil supply source OS and the retard chamber 201 via the hydraulic oil control unit OC.
The advance oil supply passage RAs connects the hydraulic oil supply source OS and the advance chamber 202 via the hydraulic oil control unit OC.
The retard angle drain oil passage RRd and the advance angle drain oil passage RAd connect the retard angle chamber 201 and the advance angle chamber 202 to the oil discharge portion OD.
The recycle oil passage Rre connects the retard angle drain oil passage RRd, the advance angle drain oil passage RAd, and the retard angle supply oil passage RRs and the advance angle supply oil passage RAs. Thereby, the hydraulic oil from the retard chamber 201 and the advance chamber 202 can be reused.

The recycle check valve 81 allows only the flow of hydraulic oil from the drain oil passage side to the retard oil supply passage RRs side and the advance oil supply passage RAs side in the recycle oil passage Rre. As a result, the flow of hydraulic oil from each supply oil passage side to the drain oil passage side, that is, backflow can be suppressed. Therefore, the responsiveness of the valve timing adjustment device 10 can be improved.
In the present embodiment, the recycle oil passage Rre is connected to the drain oil passage inside the hydraulic oil control unit OC. Therefore, the opening for the recycled oil passage Rre can be reduced by forming the recycled oil passage Rre inside the hydraulic oil control unit OC, and the drain oil passage is opened in the hydraulic oil control unit OC to the retard opening OR and the advance opening. By forming it in the square opening OA, the opening for the drain oil passage can be reduced. As a result, the number of openings for each oil passage formed on the outer wall of the hydraulic oil control unit OC can be reduced. Therefore, the physique of the hydraulic oil control unit OC can be reduced in the direction in which the openings are arranged.

(2) In the present embodiment, the hydraulic oil control unit OC includes the cylindrical sleeve 400, the cylindrical spool 60 that is provided inside the sleeve 400 and forms the specific space Ss with the sleeve 400, and the drain oil. The drain opening Od1 is formed so as to be connected to the specific space Ss in the passage and extend in the radial direction of the sleeve 400 or the spool 60 from the specific space Ss, and the drain opening Od1 connected to the specific space Ss in the recycle oil passage Rre to be opened from the specific space Ss. It has a recycling opening Ore formed so as to extend to the side opposite to the part Od1.
The recycling oil passage Rre is connected to the drain oil passage in the specific space Ss.
By forming the drain opening Od1 and the recycle opening Ore in mutually opposite directions in the radial direction of the sleeve 400 or the spool 60, the drain oil passage and the recycled oil are prevented from interfering with each other inside the hydraulic oil control valve 11. The path Rre can be provided.

(3) In the present embodiment, the drain opening Od1 is formed so that at least a part thereof overlaps the recycling opening Ore in the axial direction of the sleeve 400 or the spool 60. Therefore, the axial length of the hydraulic oil control valve 11 can be reduced.

(4) In the present embodiment, the drain opening Od1 is formed on the spool 60 so as to extend from the specific space Ss to the inside of the sleeve 400 or the spool 60 in the radial direction.
The recycling opening Ore is formed in the sleeve 400 so as to extend from the specific space Ss to the outside in the radial direction of the sleeve 400 or the spool 60.
As a result, a space equivalent to the atmospheric pressure can be formed in the center of the hydraulic oil control valve 11, and a pressurized space for supplying hydraulic oil can be formed outside the space. Therefore, it is possible to separate the spaces having different pressures inside the hydraulic oil control valve 11 into two complete layers, and it is possible to suppress the leakage of hydraulic oil from the seal portion.

Further, (5) in the present embodiment, the spool 60 is recessed radially inward from the outer peripheral wall, and the retarded angle supply recess HRs forming a part of the retarded angle oil supply passage RRs, and the retarded angle recessed radially inward from the outer peripheral wall. A retarded drain recess HRd forming a part of the retarded drain oil passage RRd that communicates the chamber 201 with the oil discharge portion OD, and a recessed radial advance inward from the outer peripheral wall to communicate the advance chamber 202 with the oil discharge portion OD. It has an advance-drain recess HAd forming a part of the advance-drain oil passage RAd, and a advance-angle supply recess HAs forming a part of the advance-angle supply oil passage RAs that is recessed radially inward from the outer peripheral wall. ..
The retard angle supply recess HRs, the retard angle drain recess HRd, the advance angle drain recess HAd, and the advance angle supply recess HAs are formed in this order in the axial direction of the spool 60.
The retarded angle drain recess HRd and the advanced angle drain recess HAd are integrally formed to form a specific space Ss.
The recycle check valve 81 is provided so as to correspond to the recycle opening Ore.
As a result, the single recycle check valve 81 can realize the reuse of the hydraulic oil on both the retard side and the advance side.

(6) In the present embodiment, the sleeve 400 has the axial supply oil passage RsA extending in the axial direction of the sleeve 400 in the retard supply oil passage RRs and the advance supply oil passage RAs.
When supplying the hydraulic oil from the axial end of the sleeve 400, the hydraulic oil RsA can easily flow the hydraulic oil to the retard supply oil passage RRs and the advance supply oil passage RAs. Further, the retarded angle oil supply passage RRs and the advanced angle oil supply passage RAs can be connected to each other inside the hydraulic oil control valve 11 by the axial oil supply passage RsA.

(7) In this embodiment, the recycle oil passage Rre connects the drain oil passage and the axial supply oil passage RsA. Accordingly, the recycle oil passage Rre connects the drain oil passage to the retard angle supply oil passage RRs and the advance angle supply oil passage RAs.

(8) In the present embodiment, the sleeve 400 has the outer sleeve 40 and the inner sleeve 50 provided inside the outer sleeve 40.
The axial oil supply passage RsA is formed at the interface T1 between the outer sleeve 40 and the inner sleeve 50. Therefore, the axial oil supply passage RsA can be easily formed inside the sleeve 400.

(9) In the present embodiment, the inner peripheral wall of the outer sleeve 40 is formed in a cylindrical surface shape. On the outer peripheral wall of the inner sleeve 50, a flow channel groove portion 52 that forms the axial oil supply passage RsA is formed. In this embodiment, the hardness of the outer sleeve 40 is set higher than the hardness of the inner sleeve 50.
(11) In this embodiment, the outer sleeve 40 has a hardness higher than that of the inner sleeve 50 having the lowest hardness. Therefore, it is possible to easily form an oil passage such as the axial supply oil passage RsA in the inner sleeve 50 while providing the outer sleeve 40 with a fastening function portion (screw portion 41) with another member.

(12) In this embodiment, the recycle check valve 81 is formed so as to be elastically deformable in the radial direction. Therefore, the structure of the recycle check valve 81 can be simplified, the recycle check valve 81 can be arranged in a small space, and the pressure loss of the hydraulic oil can be reduced.

(13) In the present embodiment, the sleeve 400 has the movement restricting portion 513 capable of restricting the axial movement of the recycle check valve 81. Therefore, it is possible to prevent the recycle check valve 81 from deviating from the recycle opening Ore and lowering the function of the recycle check valve 81 as a check valve.

Further, (14) this embodiment includes the sleeve sealing portion 51.
The sleeve sealing portion 51 closes one end of the inner sleeve 50 and forms a variable volume space Sv having a variable volume with the spool 60.
The variable volume space Sv communicates with the drain oil passage. Therefore, the variable volume space Sv can be opened to the atmosphere via the drain oil passage. Thereby, the pressure in the variable volume space Sv can be made equal to the atmospheric pressure, and the axial movement of the spool 60 can be smoothed.
Further, the space inside the spool 60 is shared by the drain oil passage and the passage that communicates the variable volume space Sv with the atmosphere, so that the hydraulic oil control valve 11 can be downsized.

Further, (15) this embodiment includes a housing 20.
The housing 20 forms a retard chamber 201 and an advance chamber 202. That is, the housing 20 is a part of the phase conversion unit PC.
The hydraulic oil control unit OC is provided so that at least a part thereof is located inside the housing 20. Therefore, the phase conversion unit PC and the hydraulic oil control unit OC can be integrally provided, the pressure loss of the hydraulic oil from the hydraulic oil control unit OC to the phase conversion unit PC can be suppressed, and the valve timing adjustment device 10 can be provided. Can be made compact.

(Second embodiment)
FIG. 13 shows a part of the valve timing adjusting device according to the second embodiment. The second embodiment differs from the first embodiment in the configuration of the hydraulic oil control valve 11 and the like.
In the second embodiment, the inner sleeve 50 has a first inner sleeve 501 and a second inner sleeve 502.

The first inner sleeve 501 is made of a material having a relatively low hardness, such as resin, and has a substantially cylindrical shape. That is, the first inner sleeve 501 is made of a material having a hardness lower than that of the outer sleeve 40.

The second inner sleeve 502 is formed in a substantially cylindrical shape from a material having a relatively high hardness including iron, for example. That is, the second inner sleeve 502 is made of a material having a hardness higher than that of the first inner sleeve 501.

The first inner sleeve 501 is provided inside the outer sleeve 40 so that the outer peripheral wall fits the inner peripheral wall of the outer sleeve 40. The first inner sleeve 501 cannot move relative to the outer sleeve 40.

The second inner sleeve 502 is provided inside the first inner sleeve 501 so that the outer peripheral wall fits the inner peripheral wall of the first inner sleeve 501. The second inner sleeve 502 is immovable relative to the first inner sleeve 501.

The retard angle supply opening portion ORs extends in the radial direction of the sleeve 400 and connects the space inside the second inner sleeve 502, the cylindrical space St1 outside the first inner sleeve 501, and the axial supply oil passage RsA. Has been formed. The restriction groove portion 511 is not formed in the second inner sleeve 502.
The advance feed opening OAs is formed so as to extend in the radial direction of the sleeve 400 and connect the space inside the second inner sleeve 502 to the annular space St2 outside the first inner sleeve 501 and the axial oil supply passage RsA. Has been done. The restriction groove 512 is not formed in the second inner sleeve 502.

The retard opening OR extends in the radial direction of the sleeve 400 and connects the space inside the second inner sleeve 502 and the space outside the outer sleeve 40.
The advance opening OA is formed so as to extend in the radial direction of the sleeve 400 and connect the space inside the second inner sleeve 502 and the space outside the outer sleeve 40.

The recycling opening Ore is formed so as to extend in the radial direction of the sleeve 400 and connect the space inside the second inner sleeve 502 to the movement restricting portion 513 and the axial supply oil passage RsA. The movement restricting portion 513 is formed on the first inner sleeve 501.

The second embodiment includes a sealing body 45 and a reed valve 70.
The sealing body 45 is formed in a plate shape, and is provided inside the outer sleeve 40 so as to close the end of the outer sleeve 40 on the side opposite to the locking portion 59. The sealing body 45 has a flow path hole 451. The flow path hole 451 is formed so as to penetrate the sealing body 45 in the plate thickness direction. In the flow path hole 451, a retarded angle oil supply passage RRs and an advanced angle oil supply passage RAs are formed. A filter 58 is provided on the opposite side of the sealing body 45 from the inner sleeve 50.

As shown in FIG. 14, the reed valve 70 is formed in a circular shape by using a thin metal plate, for example. The reed valve 70 has an opening 702, a support 703, and a valve 701.
The opening 702 is formed so as to penetrate the reed valve 70 in the plate thickness direction. The support portion 703 is formed so as to extend inside the opening portion 702 from the inner edge portion of the opening portion 702. The valve portion 701 is formed in a circular shape, and is integrally formed with the support portion 703 so as to be connected to the tip portion of the support portion 703. The support portion 703 supports the valve portion 701. In the reed valve 70, the valve portion 701 and the support portion 703 can be elastically deformed.
Here, the valve portion 701 corresponds to the retarded angle supply check valve 71 and the advanced angle supply check valve 72. That is, in this embodiment, the retarded angle supply check valve 71 and the advanced angle supply check valve 72 are integrally formed in the reed valve 70.
The reed valve 70 is provided on the surface of the sealing body 45 on the inner sleeve 50 side so that the valve portion 701 corresponds to the flow path hole portion 451.

When the working oil flows from the passage hole portion 451 side to the inner sleeve 50 side in the retard angle supply oil passage RRs and the advance angle supply oil passage RAs, the valve portion 701 is pushed to the inner sleeve 50 side by the operation oil. At this time, the support portion 703 and the valve portion 701 are elastically deformed, and the valve portion 701 is separated from the flow path hole portion 451. This allows the flow of hydraulic oil from the flow path hole 451 side to the inner sleeve 50 side.
On the other hand, when the hydraulic oil flows from the inner sleeve 50 side to the flow path hole 451 side in the retard angle supply oil passage RRs and the advance angle supply oil passage RAs, the valve portion 701 is pressed against the sealing body 45, 451 is closed. As a result, the flow of hydraulic oil from the inner sleeve 50 side to the flow path hole 451 side is restricted.
The second embodiment is the same as the first embodiment except for the points described above.

As described above, (10) in the present embodiment, the inner sleeve 50 includes the first inner sleeve 501 and the second inner sleeve 501 provided inside the first inner sleeve 501 and having a hardness higher than that of the first inner sleeve 501. It has a sleeve 502. Thereby, the oil passage can be easily formed in the first inner sleeve 501, and the wear resistance of the inner peripheral wall of the second inner sleeve 502 that slides on the spool 60 can be improved.

(11) In the present embodiment, the outer sleeve 40 has a higher hardness than the portion of the inner sleeve 50 having the lowest hardness (first inner sleeve 501). Therefore, it is possible to easily form an oil passage such as the axial oil supply passage RsA in the inner sleeve 50 (first inner sleeve 501) while providing the outer sleeve 40 with a fastening function portion (screw portion 41) with another member. it can.

(Third Embodiment)
A valve timing adjusting device according to the third embodiment will be described with reference to FIGS. The third embodiment is different from the first embodiment in the shapes of the retard supply check valve 71, the advance supply check valve 72, the recycle check valve 81, and the like.

In the third embodiment, the retarded supply check valve 71 is formed in a substantially cylindrical shape by bending, for example, a rectangular metal thin plate so that the longitudinal direction is along the circumferential direction, as in the first embodiment. FIG. 15 is an expanded view of the retard supply check valve 71. FIG. 16 is a cross-sectional view of the retard angle supply check valve 71 at an intermediate position in the axial direction.

In the third embodiment, the retarded supply check valve 71 has an overlapping portion 700, an opening 702, a support portion 703, and a valve portion 701.
The overlapping portion 700 is formed at one end portion in the circumferential direction of the retarded angle supply check valve 71. The overlapping portion 700 is formed so as to overlap the outside in the radial direction of the other end portion in the circumferential direction of the retarded angle supply check valve 71 (see FIG. 15 ).

Four openings 702 are formed at equal intervals in the circumferential direction of the retarded angle supply check valve 71.
The support portion 703 is formed so as to extend in the circumferential direction of the retarded angle supply check valve 71 from the inner edge portion of each of the four openings 702.

The valve portion 701 is formed so as to be connected to the tip of the support portion 703. Here, four valve portions 701 are formed at equal intervals in the circumferential direction of the retarded angle supply check valve 71.

The retard supply check valve 71 is provided in the restriction groove portion 511 of the inner sleeve 50. In the retard supply check valve 71, the support portion 703 and the valve portion 701 are provided inside the restriction groove portion 511 so as to be elastically deformable in the radial direction. Here, the retard supply check valve 71 is provided so that the four valve portions 701 correspond to the four retard supply openings ORs, respectively. That is, in this embodiment, four retarded angle supply openings ORs are formed at equal intervals in the circumferential direction of the inner sleeve 50.

The configuration of the advance angle supply check valve 72 is similar to that of the retard angle supply check valve 71, and thus detailed description of the configuration is omitted.
The advance supply check valve 72 is provided in the restriction groove portion 512 of the inner sleeve 50. In the advance supply check valve 72, the support portion 703 and the valve portion 701 are provided inside the restriction groove portion 512 so as to be elastically deformable in the radial direction. Here, the advance feed check valve 72 is provided so that the four valve portions 701 respectively correspond to the four advance feed openings OAs. That is, in this embodiment, four advance supply openings OAs are formed at equal intervals in the circumferential direction of the inner sleeve 50.

The structure of the recycle check valve 81 is the same as that of the retard angle supply check valve 71 except for the difference in the outer diameter, and therefore the detailed description of the structure is omitted.
The recycle check valve 81 is provided on the movement restricting portion 513 of the inner sleeve 50. In the recycle check valve 81, the support portion 703 and the valve portion 701 are provided inside the movement restricting portion 513 so as to be elastically deformable in the radial direction. Here, the recycle check valve 81 is provided so that the four valve portions 701 respectively correspond to the four recycle opening portions Ore. That is, in this embodiment, the four recycling openings Ore are formed at equal intervals in the circumferential direction of the inner sleeve 50.
The third embodiment is the same as the first embodiment except for the points described above.

(Fourth Embodiment)
A valve timing adjusting device according to the fourth embodiment will be described with reference to FIG. The fourth embodiment is different from the first embodiment in the shapes of the retard supply check valve 71, the advance supply check valve 72, the recycle check valve 81, and the like.
In the fourth embodiment, the retarded supply check valve 71 is formed in a substantially cylindrical shape by bending, for example, a rectangular metal thin plate so that the longitudinal direction is along the circumferential direction, as in the first embodiment. FIG. 17 is a developed view of the retard supply check valve 71.

In the fourth embodiment, the retarded angle supply check valve 71 has an overlapping portion 700 and a cutout portion 704.
The overlapping portion 700 is formed at one end portion in the circumferential direction of the retarded angle supply check valve 71. The overlapping portion 700 is formed so as to overlap the outside in the radial direction of the other end portion in the circumferential direction of the retarded angle supply check valve 71.

The cutout portion 704 is formed so as to axially cut out both end portions in the axial direction of the retarded angle supply check valve 71. A plurality of notches 704 are formed at intervals in the circumferential direction of the retarded angle supply check valve 71.

The retard supply check valve 71 is provided in the restriction groove portion 511 of the inner sleeve 50. The retard supply check valve 71 is provided inside the restriction groove portion 511 so as to be elastically deformable in the radial direction.
When the retarded supply check valve 71 is deformed radially inward or radially outward, the hydraulic oil can flow through the notch 704. Therefore, it is possible to prevent the hydraulic fluid around the retard supply check valve 71 from inhibiting the radial deformation of the retard supply check valve 71 in the radial direction. Thereby, the operation of the opening/closing valve of the retard angle supply check valve 71 can be made smooth.

The configuration of the advance angle supply check valve 72 is similar to that of the retard angle supply check valve 71, and thus detailed description of the configuration is omitted.
The advance supply check valve 72 is provided in the restriction groove portion 512 of the inner sleeve 50. The advance supply check valve 72 is provided inside the restriction groove 512 so as to be elastically deformable in the radial direction.
When the advance supply check valve 72 is deformed radially inward or radially outward, hydraulic oil can flow through the cutout portion 704. Therefore, it is possible to prevent the hydraulic oil around the advance supply check valve 72 from inhibiting the radial deformation of the advance supply check valve 72. As a result, the operation of the opening/closing valve of the advance supply check valve 72 can be made smooth.

The structure of the recycle check valve 81 is the same as that of the retard angle supply check valve 71 except for the difference in the outer diameter, and therefore the detailed description of the structure is omitted.
The recycle check valve 81 is provided on the movement restricting portion 513 of the inner sleeve 50. The recycle check valve 81 is provided inside the movement restricting portion 513 so as to be elastically deformable in the radial direction.
When the recycle check valve 81 is deformed radially inward or radially outward, the hydraulic oil can flow through the cutout portion 704. Therefore, it is possible to prevent the hydraulic oil around the recycle check valve 81 from inhibiting the radial deformation of the recycle check valve 81. Thereby, the operation of the opening/closing valve of the recycle check valve 81 can be made smooth.
The sixth embodiment is the same as the first embodiment except for the points described above.

(Other embodiments)
In another embodiment of the present invention, the drain opening Od1 may not be formed so that at least a part thereof overlaps the recycling opening Ore in the axial direction of the sleeve 400 or the spool 60.

Further, in the above-described embodiment, the flow channel groove portion 52 (axial direction oil supply passage RsA) is formed on the interface T1 between the outer sleeve 40 and the inner sleeve 50 so as to be recessed radially inward from the outer peripheral wall of the inner sleeve 50. I showed an example. On the other hand, in another embodiment of the present invention, the flow channel groove portion 52 is formed on the interface T1 between the outer sleeve 40 and the inner sleeve 50 so as to be recessed radially outward from the inner peripheral wall of the outer sleeve 40. Good.

In the first and second embodiments described above, the outer sleeve 40 is made of a material containing iron, and the inner sleeve 50 is made of a material containing aluminum. On the other hand, in another embodiment of the present invention, the inner sleeve 50 may be made of any material as long as it has a lower hardness than the outer sleeve 40. The outer sleeve 40 may be made of any material as long as it has a higher hardness than the inner sleeve 50. Further, the inner sleeve 50 may not be surface-hardened.

In the above-described second embodiment, the outer sleeve 40 is made of a material containing iron, the first inner sleeve 501 is made of a resin, and the second inner sleeve 502 is made of a material containing iron. .. On the other hand, in another embodiment of the present invention, the first inner sleeve 501 may be made of any material as long as it has a lower hardness than the outer sleeve 40 and the second inner sleeve 502. .. The outer sleeve 40 may be made of any material as long as it has a higher hardness than the first inner sleeve 501. The second inner sleeve 502 may be made of any material as long as it has a higher hardness than the first inner sleeve 501.

Further, in another embodiment of the present invention, the hydraulic oil control valve 11 may be provided so that all the parts are located outside the housing 20. In this case, the outer sleeve 40 can omit the screw portion 41. Further, in this case, both the outer sleeve 40 and the inner sleeve 50 may be made of a material containing aluminum. In this case, the material cost can be reduced while ensuring the strength of the outer sleeve 40 and the inner sleeve 50.

In another embodiment of the present invention, instead of the chain 6, the housing 20 and the crankshaft 2 may be connected by a transmission member such as a belt.

Further, in the above-described embodiment, the vane rotor 30 is fixed to the end of the cam shaft 3, and the housing 20 rotates in conjunction with the crank shaft 2. On the other hand, in another embodiment of the present invention, the vane rotor 30 may be fixed to the end of the crankshaft 2 and the housing 20 may rotate in conjunction with the camshaft 3.

The valve timing adjusting device 10 of the present invention may adjust the valve timing of the exhaust valve 5 of the engine 1.
As described above, the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

1 engine (internal combustion engine), 4 intake valve (valve), 5 exhaust valve (valve), 10 valve timing adjusting device, PC phase converter, 201 retard chamber, 202 advancing chamber, OS hydraulic oil supply source, 8 oil Pump (hydraulic oil supply source), OC hydraulic oil control part, 11 hydraulic oil control valve (hydraulic oil control part), OD oil discharge part, 7 oil pan (oil discharge part), RRs retard oil supply passage, RAs advance angle Supply oil passage, RRd retarded drain oil passage (drain oil passage), RAd advanced angle drain oil passage (drain oil passage), Rre recycled oil passage, 81 recycling check valve

Claims (17)

A valve timing adjusting device (10) for adjusting valve timing of valves (4, 5) of an internal combustion engine (1), comprising:
A phase converter (PC) having a retard chamber (201) and an advance chamber (202),
A hydraulic oil supply source (OS) for supplying hydraulic oil to the retard chamber and the advance chamber;
A hydraulic oil control unit (OC) for controlling hydraulic oil supplied from the hydraulic oil supply source to the retard chamber and the advance chamber;
An oil discharge part (OD) for discharging hydraulic oil from the retard chamber or the advance chamber;
A retard oil supply passage (RRs) connecting the hydraulic oil supply source and the retard chamber via the hydraulic oil control unit;
An advance oil supply passage (RAs) that connects the hydraulic oil supply source and the advance chamber via the hydraulic oil control unit;
A drain oil passage (RRd, RAd) connecting the retard chamber and the advance chamber to the oil discharge part;
A recycle oil passage (Rre) that connects the drain oil passage to the retard angle supply oil passage and the advance angle supply oil passage;
A recycle check valve (81) that allows only the flow of hydraulic oil from the drain oil passage side to the retard oil supply passage side and the advance oil supply passage side in the recycle oil passage,
The recycle oil passage is connected to the drain oil passage inside the hydraulic oil control unit ,
The hydraulic oil control unit includes a tubular sleeve (400) and a tubular spool (60) provided so as to be capable of reciprocating inside the sleeve,
The recycle check valve is a valve timing adjusting device provided on the sleeve . The sleeve has an outer sleeve (40) and an inner sleeve (50) provided inside the outer sleeve,
The valve timing adjusting device according to claim 1, wherein the recycle check valve is provided between the outer sleeve and the inner sleeve. The spool forms a specific space (Ss) with the sleeve,
In the drain oil passage, the hydraulic oil control unit is connected to the specific space and is formed to extend from the specific space in a radial direction of the sleeve or the spool, and a drain oil passage. A recycle opening (Ore) connected to the specific space and extending from the specific space to the opposite side of the drain opening;
The valve timing adjusting device according to claim 1, wherein the recycle oil passage is connected to the drain oil passage in the specific space. A valve timing adjusting device (10) for adjusting valve timing of valves (4, 5) of an internal combustion engine (1), comprising:
A phase converter (PC) having a retard chamber (201) and an advance chamber (202),
A hydraulic oil supply source (OS) for supplying hydraulic oil to the retard chamber and the advance chamber;
A hydraulic oil control unit (OC) that controls hydraulic oil supplied from the hydraulic oil supply source to the retard chamber and the advance chamber;
An oil discharge part (OD) for discharging hydraulic oil from the retard chamber or the advance chamber;
A retard oil supply passage (RRs) connecting the hydraulic oil supply source and the retard chamber via the hydraulic oil control unit;
An advance angle supply oil passage (RAs) that connects the hydraulic oil supply source and the advance angle chamber via the hydraulic oil control unit;
A drain oil passage (RRd, RAd) connecting the retard chamber and the advance chamber to the oil discharge part;
A recycle oil passage (Rre) that connects the drain oil passage to the retard angle supply oil passage and the advance angle supply oil passage;
A recycle check valve (81) that allows only the flow of hydraulic oil from the drain oil passage side to the retard oil supply passage side and the advance oil supply passage side in the recycle oil passage,
The recycle oil passage is connected to the drain oil passage inside the hydraulic oil control unit ,
The hydraulic oil control unit includes a cylindrical sleeve (400), a cylindrical spool (60) provided inside the sleeve and forming a specific space (Ss) with the sleeve, and in the drain oil passage. A drain opening (Od1) formed so as to be connected to the specific space and extend in the radial direction of the sleeve or the spool from the specific space, and the drain opening from the specific space to be connected to the specific space in the recycle oil passage. Has a recycling opening (Ore) formed to extend to the opposite side of the section,
The recycle oil passage is a valve timing adjusting device connected to the drain oil passage in the specific space . The valve timing adjusting device according to claim 3 , wherein the drain opening is formed so that at least a part thereof overlaps the recycling opening in the axial direction of the sleeve or the spool. The drain opening is formed in the spool so as to extend inward in the radial direction of the sleeve or the spool from the specific space,
The valve timing adjusting device according to any one of claims 3 to 5, wherein the recycle opening is formed in the sleeve so as to extend from the specific space to a radial outside of the sleeve or the spool. The spool is retarded radially inward from an outer peripheral wall and forms a part of the retarded oil supply passage. Retardation supply recesses (HRs) are radially inwardly recessed from the outer peripheral wall to the retard chamber and the oil discharge portion. A retard angle drain recess (HRd) forming a part of the drain oil passage communicating with the drain oil passage, and a part of the drain oil passage communicating with the advance chamber and the oil discharge portion that is recessed radially inward from the outer peripheral wall. An advancing drain recess (HAd) to be formed, and an advancing supply recess (HAs) which is recessed radially inward from the outer peripheral wall and forms a part of the advancing oil supply passage,
The retard angle supply concave portion, the retard angle drain concave portion, the advance angle drain concave portion, the advance angle supply concave portion are formed to be arranged in this order in the axial direction of the spool,
The retard angle drain concave portion and the advance angle drain concave portion are integrally formed to form the specific space,
The recycling check valve, the valve timing control apparatus according to any one of the recycling apertures claims 3 to which is provided so as to correspond to the portion 6. The sleeve according to any one of the retard angle oil supply passage and the advance angle oil supply passage the axial supply oil passage extending in the axial direction of the sleeve (RsA) by which claims 3-7 have in Valve timing adjustment device. The valve timing adjusting device according to claim 8 , wherein the recycle oil passage connects the drain oil passage and the axial supply oil passage. The sleeve has an outer sleeve (40) and an inner sleeve (50) provided inside the outer sleeve,
The valve timing adjusting device according to claim 8 or 9 , wherein the axial oil supply passage is formed at an interface (T1) between the outer sleeve and the inner sleeve. One of the inner peripheral wall of the outer sleeve or the outer peripheral wall of the inner sleeve is formed into a cylindrical surface shape,
The valve timing adjusting device according to claim 10 , wherein a channel groove portion (52) forming the axial oil supply passage is formed on the other of the inner peripheral wall of the outer sleeve or the outer peripheral wall of the inner sleeve. The inner sleeve has a first inner sleeve (501), and said first claim hardness than the first inner sleeve disposed inside the inner sleeve has a higher second inner sleeve (502) 10 Alternatively, the valve timing adjusting device according to item 11 . The outer sleeve, most hardness valve timing control apparatus according to any one of the high hardness claims 10 to 12 than the lower part of said inner sleeve. The recycling check valve, the valve timing control apparatus according to any one of claims 1 to 13 which is elastically deformable formed radially. The valve timing adjusting device according to claim 14 , wherein the sleeve has a movement restricting portion (513) capable of restricting axial movement of the recycle check valve. A sleeve sealing part (51) for closing one end of the sleeve and forming a variable volume space (Sv) in which the volume changes with the spool,
It said variable volume space, a valve timing control apparatus according to any one of claims 1 to 15, which communicates with the drain oil passage. Further comprising a housing (20) forming the retard chamber and the advance chamber,
The hydraulic fluid control unit is at least partially valve timing control apparatus according to any one of the provided its dependent claims 1-16 so as to be located inside the housing.

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