JP6417788B2 - Valve timing adjustment system and manufacturing method thereof - Google Patents

Description

  The present invention relates to a valve timing adjustment system and a manufacturing method thereof.

2. Description of the Related Art Conventionally, there is known a valve timing adjustment system that adjusts the opening / closing timing of a valve that is driven to open and close by changing the relative rotational phase between an engine drive shaft and a driven shaft.
The valve timing adjustment system described in Patent Literature 1 includes a valve timing adjustment mechanism fixed to a driven shaft of an engine, and an electric adjustment unit provided at a position facing the rotation axis direction of the valve timing adjustment mechanism. Yes. A shaft extending from the electric adjustment unit is inserted into a hole provided in a housing provided in the valve timing adjustment mechanism. The oil seal provided on the inner wall of the hole of the housing prevents oil inside the housing from leaking from the gap between the shaft and the housing to the outside of the housing.

German Patent Application Publication No. 102004062037A1

However, the valve timing adjustment system described in Patent Document 1 does not include means for coaxially adjusting the valve timing adjustment mechanism and the electric adjustment unit. Therefore, if the valve timing adjustment mechanism and the electric adjustment unit are eccentric, a gap is formed between the shaft and the oil seal, and oil may leak from the gap to the outside of the housing.
The present invention has been made in view of the above problems, and provides a valve timing adjustment system and a method for manufacturing the same that can suppress axial deviation between a cylindrical solenoid cover shaft and a rotation shaft of a valve timing adjustment mechanism. For the purpose.

According to a first aspect and a second aspect of the present invention , there is provided a valve timing adjustment system including a solenoid on one side in a rotation axis direction of the valve timing adjustment mechanism, wherein a cylindrical solenoid cover surrounding the outer periphery of the solenoid is a valve timing adjustment mechanism. extending to the side, that match fit to be plane and sliding radially inward or radially outward of the valve timing adjusting mechanism.
In the first aspect of the present invention, the vane rotor of the valve timing adjustment mechanism includes the rotor fixed to the driven shaft, the vane extending radially outward from the rotor, the rotor fixed to the rotor, and the housing of the valve timing adjustment mechanism. A cylindrical bushing protruding from the provided hole to the solenoid side. The solenoid cover is in sliding contact with the inner surface or the outer surface of the bushing.
In the second aspect of the present invention, the valve timing adjustment mechanism includes a hydraulic control valve that is fixed to the rotation center of the valve timing adjustment mechanism and switches the hydraulic pressure supplied to the valve timing adjustment mechanism. The solenoid cover is slidably fitted to the outer surface of the hydraulic control valve.
As a result, the axial deviation between the shaft of the cylindrical solenoid cover and the rotating shaft of the valve timing adjusting mechanism is suppressed. For this reason, when an annular oil seal is provided between the housing and solenoid cover provided in the valve timing adjustment mechanism, there should be a gap caused by shaft misalignment between the housing and oil seal or between the solenoid cover and oil seal. Is prevented. Therefore, the valve timing adjusting system maintains the oil tightness by the oil seal, and the intention is due to the shaft misalignment from the oil reservoir formed between the inside diameter of the solenoid cover and the valve timing adjusting mechanism to the space outside the housing and the solenoid cover. Do not leak oil.

According to a third aspect and a fourth aspect of the present invention , in the valve timing adjustment system, the inner diameter of the cylindrical solenoid cover that surrounds the outer periphery of the solenoid and extends toward the valve timing adjustment mechanism is on the solenoid side of the valve timing adjustment mechanism. or is the same as the inner diameter of the provided a cylindrical portion or not greater than the.
In the third aspect of the present invention, the solenoid cover extends toward the valve timing adjustment mechanism so as not to be slidably fitted to the radially inner surface and the radially outer surface of the valve timing adjustment mechanism.
In the fourth aspect of the present invention, a gap is formed in the axial direction between the end of the solenoid cover on the valve timing adjustment mechanism side and the valve timing adjustment mechanism.
As a result, when the valve timing adjustment system is assembled, a jig can be inserted into the cylindrical portion provided in the valve timing adjustment mechanism from the inside of the solenoid cover, and the solenoid cover and the valve timing adjustment mechanism can be adjusted coaxially. Is possible. Therefore, the shaft of the solenoid cover and the rotation shaft of the valve timing adjusting mechanism can be coaxially assembled.

A fifth aspect of the present invention is a method for manufacturing the valve timing adjustment system of the second invention. This manufacturing method is characterized in that a jig is inserted from the inside of the solenoid cover to the inside of the cylindrical portion of the valve timing adjustment mechanism, and the solenoid cover and the valve timing adjustment mechanism are adjusted coaxially.
By this manufacturing method, the shaft of the solenoid cover and the rotating shaft of the valve timing adjusting mechanism can be coaxially assembled.

1 is a cross-sectional view of a valve timing adjustment system according to a first embodiment of the present invention. Sectional drawing of the II-II line | wire of FIG. The schematic diagram of the motive power transmission system of the engine in which the valve timing adjustment system by 1st Embodiment of this invention is used. The enlarged view of the IV part of FIG. Sectional drawing of the valve timing adjustment system by 2nd Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 3rd Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 4th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 5th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 6th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 6th Embodiment of this invention. The manufacturing process figure of the valve timing adjustment system by 6th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 7th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 7th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 8th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 8th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 9th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 10th Embodiment of this invention. FIG. 18 is an essential part cross-sectional view taken along line XVIII-XVIII in FIG. 17. The principal part sectional drawing of the valve timing adjustment system by 11th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 12th Embodiment of this invention. Sectional drawing of the valve timing adjustment system by 13th Embodiment of this invention. A sectional view of a valve timing adjustment system by a 14th embodiment of the present invention. A sectional view of a valve timing adjustment system by a 15th embodiment of the present invention.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the plurality of embodiments, substantially the same components are denoted by the same reference numerals and description thereof is omitted.

(First embodiment)
A first embodiment of the present invention is shown in FIGS. The valve timing adjustment system 1 of this embodiment is used for the power transmission system of the engine 2 shown in FIG. In the power transmission system, a belt 9 is wound around a pulley 4 fixed to a crankshaft 3 as a drive shaft of the engine 2 and pulleys 7 and 8 fixed to two camshafts 5 and 6 as driven shafts. Thus, torque is transmitted from the crankshaft 3 to the camshafts 5 and 6.
One camshaft 5 drives an intake valve 10 and the other camshaft 6 drives an exhaust valve 11. The valve timing adjustment mechanism 20 provided in the valve timing adjustment system 1 of the first embodiment connects the pulley 7 to the belt 9 and the vane rotor 40 to the camshaft 5. As a result, the valve timing adjusting mechanism 20 adjusts the opening / closing timing of the intake valve 10 by rotating the crankshaft 3 and the camshaft 5 with a predetermined phase difference and changing the relative rotational phase.

As shown in FIGS. 1 and 3, the belt cover 12 includes a front cover 13 and a rear cover 14. The belt cover 12 is wound around the valve timing adjusting mechanism 20 and the pulley 7 of the valve timing adjusting mechanism 20. The belt 9 is covered. The belt cover 12 prevents oil or the like from adhering to the belt 9 that transmits the driving force of the crankshaft 3 to the valve timing adjusting mechanism 20.
An arrow R shown in FIG. 3 represents the rotation direction of the belt 9.

As shown in FIGS. 1 and 2, the valve timing adjustment system 1 includes a valve timing adjustment mechanism 20, a solenoid 90, a solenoid cover 91, and the like. Hereinafter, these configurations will be described.
[Valve timing adjustment mechanism]
The valve timing adjustment mechanism 20 includes a housing 21, a vane rotor 40, a hydraulic control valve 60, and the like.
The housing 21 includes a housing vane 22, a rear cover 23, a pulley 7, and the like.
The housing vane 22 is formed in a bottomed cylindrical shape. The housing vane 22 has a front wall 24, a peripheral wall 25, and a plurality of protrusions 26.
The front wall 24 of the housing vane 22 has a central hole 27. The peripheral wall 25 extends in a cylindrical shape from the outer edge of the front wall 24. The plurality of protrusions 26 extend from the peripheral wall 25 in the radially inward direction. A hydraulic chamber 30 is formed inside the housing vane 22 between the protruding portions 26 adjacent to each other in the rotational direction.

The rear cover 23 has an annular part 31 and a cylindrical part 32. The annular portion 31 is provided at the open end of the housing vane 22 opposite to the front wall 24. The cylindrical portion 32 extends from the inner edge of the annular portion 31 to the side opposite to the front wall in the axial direction. The rear cover 23 has a through hole 33 through which the camshaft 5 is inserted inside the cylindrical portion 32.
An O-ring 34 is provided between the annular portion 31 of the rear cover 23 and the housing vane 22. The O-ring 34 prevents oil from leaking from the inside of the housing 21.
A seal member 35 is provided between the cylindrical portion 32 of the rear cover 23 and the rear cover 14 of the belt cover 12. The seal member 35 prevents oil from entering the space 16 provided with the belt 9 inside the belt cover 12 from the oil discharge space 15 opened to the outside outside the camshaft 5.

The pulley 7 has a flange portion 36 and a tooth portion 37. The flange portion 36 is formed in a disk shape, and is fixed to the housing vane 22 together with the rear cover 23 by a bolt 38.
The tooth portion 37 extends in a cylindrical shape from the outer edge of the flange portion 36 to one side in the rotation axis direction, and is positioned on the outer diameter side of the peripheral wall 25 of the housing vane 22. The belt 9 is wound around the tooth portion 37 of the pulley 7. Therefore, the housing 21 is rotated by the driving force transmitted from the crankshaft 3 through the belt 9.

The vane rotor 40 is provided so as to be relatively rotatable with respect to the housing 21 and is fixed to the end portion of the camshaft 5 so as not to be relatively rotatable. The vane rotor 40 includes a cylindrical rotor 41, a plurality of vanes 42, a bushing 43, and the like.
The rotor 41 has an accommodation hole 44 for accommodating the hydraulic control valve 60 in the central axial direction. The bushing 43 is fixed to the side of the rotor 41 opposite to the rear cover.
The plurality of vanes 42 extend radially outward from the rotor 41 and partition the hydraulic chamber 30 of the housing 21 into an advance chamber 45 and a retard chamber 46. The advance chamber 45 is supplied with hydraulic pressure or discharged through an advance oil passage 47. The retardation chamber 46 is supplied with hydraulic pressure or discharged through a retardation oil passage 48.

A seal member 49 is provided on the radially outer wall of the rotor 41 and the radially outer wall of the vane 42. The seal member 49 restricts the flow of oil between the advance chamber 45 and the retard chamber 46. The vane rotor 40 rotates relative to the housing 21 in accordance with the hydraulic pressure supplied to the advance chamber 45 and the retard chamber 46.
2 indicate the advance direction and the retard direction of the vane rotor 40 with respect to the housing 21.

A stopper piston 50 is accommodated in a hole provided in the vane rotor 40 so as to be capable of reciprocating in the axial direction. On the other hand, a recess 51 provided in the front wall 24 is provided with a ring 51 into which the stopper piston 50 can be fitted. The stopper piston 50 can enter the inside of the ring 51 by the biasing force of the spring 52 when the vane rotor 40 is at the most retarded position with respect to the housing 21.
A first pressure chamber 53 and a second pressure chamber 54 are provided around the stopper piston 50. One of the first pressure chamber 53 and the second pressure chamber 54 communicates with the retard chamber 46 and the other communicates with the advance chamber 45.
When the sum of the force that the hydraulic pressure of the first pressure chamber 53 acts on the stopper piston 50 and the force that the hydraulic pressure of the second pressure chamber 54 acts on the stopper piston 50 becomes greater than the biasing force of the spring 52, the stopper piston 50. Comes out of the ring 51.

The hydraulic control valve 60 includes a bolt-shaped sleeve 61 and a spool 62 provided inside the sleeve 61.
The sleeve 61 passes through the receiving hole 44 of the vane rotor 40 and is provided on the camshaft 5, so that the sleeve 61 is screwed into the screw 17, and the head 63 comes into contact with the bushing 43 of the vane rotor 40. Thereby, the camshaft 5, the vane rotor 40, and the sleeve 61 are fixed.

As shown in FIGS. 1 and 4, the sleeve 61 has an advance port 64, a supply port 65, and a retard port 66 in this order from the head 63 side on the radially outer wall. Further, the sleeve 61 has a sliding chamber 67 that houses the spool 62 and a shaft passage 69 that communicates the sliding chamber 67 with a discharge oil passage 68 provided in the camshaft 5 on the inner diameter side.
The advance port 64 communicates with the advance oil passage 47 of the vane rotor 40.
The retard port 66 communicates with the retard oil passage 48 of the vane rotor 40.
The supply port 65 communicates with the supply path 55 of the vane rotor 40. The supply path 55 of the vane rotor 40 communicates with the hydraulic pressure supply path 18 provided in the camshaft 5. Therefore, the oil pumped up from the oil pan 19 of the vehicle by the oil pump 191 is supplied to the supply port 65 via the supply path 55 of the vane rotor 40 and the hydraulic pressure supply path 18 of the camshaft 5.

The spool 62 is provided in a sliding chamber 67 provided inside the sleeve 61 so as to be capable of reciprocating in the axial direction.
The spool 62 has a front slot 71, a middle slot 72, and a rear slot 73 on the outer wall in the radial direction from the front. A first land 74 is provided between the front groove portion 71 and the middle groove portion 72, and a second land 75 is provided between the middle groove portion 72 and the rear groove hole portion 73.
The spool 62 has an internal oil passage 76 inside. The internal oil passage 76 communicates with the sliding chamber 67 of the sleeve 61. The internal oil passage 76 communicates with the sliding chamber 67, the shaft passage 69, and the discharge oil passage 68 of the camshaft 5. The internal oil passage 76 communicates with the oil reservoir 77.
The oil reservoir 77 stores oil discharged from a gap between the housing 21 and the vane rotor 40 or oil discharged from the advance oil passage 47 or the retard oil passage 48. The oil reservoir 77 communicates with the internal oil passage 76, the sliding chamber 67, the shaft passage 69, and the discharge oil passage 68 of the camshaft 5.

A stopper ring 78 provided on the head portion 63 of the sleeve 61 prevents the spool 62 from coming out of the sliding chamber 67 of the sleeve 61.
A spring 79 is provided between the spool 62 and the inner wall of the sliding chamber 67 of the sleeve 61. The spring 79 biases the spool 62 toward the stopper ring 78 side. The axial position of the spool 62 is determined by the axial position of the pressing pin 92 of the solenoid 90 provided on the side opposite to the spring 79 with respect to the spool 62. The spool 62 can selectively connect the ports of the sleeve 61 according to the position in the axial direction.

When the phase of the vane rotor 40 is controlled to the advance side with respect to the housing vane 22, the spool 62 connects the supply port 65 and the advance port 64 by the intermediate groove portion 72, and the retard port 66 and the internal oil passage 76 of the spool 62. Are connected by a rear groove 73.
Further, when the phase of the vane rotor 40 is retarded with respect to the housing vane 22, the spool 62 connects the supply port 65 and the retard port 66 by the intermediate groove portion 72, and the advance port 64 and the internal oil passage 76 are connected. Are connected by a front groove 71.

[Solenoid cover]
As shown in FIG. 1, the solenoid cover 91 is formed in a cylindrical shape and is attached to the belt cover 12 by a bolt 93. The bolt 93 passes through the bolt hole 94 of the solenoid cover 91 and is screwed into a female screw 121 formed on the belt cover 12, thereby fixing the solenoid cover 91 and the belt cover 12. The inner diameter D1 of the bolt hole 94 included in the solenoid cover 91 is larger than the outer diameter D2 of the bolt 93. Therefore, even when the position of the solenoid cover 91 is slightly deviated from the belt cover 12, the bolt 93 can fix the solenoid cover 91 and the belt cover 12.

  The solenoid cover 91 extends from the belt cover 12 to the valve timing adjustment mechanism 20 and is slidably fitted to a radially inner surface or a radially outer surface of the valve timing adjustment mechanism 20. In the first embodiment, the outer outer wall of the solenoid cover 91 and the inner wall surface 271 of the central hole 27 provided in the front wall 24 of the housing vane 22 are in sliding contact. That is, the outer surface of the solenoid cover 91 and the inner surface 271 of the housing 21 are slidably fitted. Hereinafter, a portion where the solenoid cover 91 and the valve timing adjusting mechanism 20 are slidably fitted is referred to as a bearing portion.

[Oil seal]
An annular oil seal 95 is provided on the solenoid 90 side of the bearing portion described above. The oil seal 95 is made of, for example, rubber, elastomer or silicone. The oil seal 95 is press-fitted and fixed to the front wall 24 of the housing 21 and is in sliding contact with the outer wall of the solenoid cover 91. The oil seal 95 leaks oil from an oil reservoir 77 formed between the inside diameter of the solenoid cover 91 and the valve timing adjusting mechanism 20 to the space 16 in which the belt 21 outside the housing 21 and the solenoid cover 91 is provided. prevent.

  When the oil seal 95 is fixed to the housing 21, the oil seal 95 rotates integrally with the housing 21. On the other hand, the solenoid cover 91 is fixed to the belt cover 12 by a bolt 93 inserted into the bolt hole 94. Therefore, the housing 21 is in sliding contact with the solenoid cover 91 fixed to the belt cover 12 while rotating integrally with the oil seal 95. At this time, the outer surface of the solenoid cover 91 and the inner surface of the housing 21 are slidably engaged with each other, and there is a slight gap between the slidable surfaces. A part of the oil 77 is supplied to the sliding contact surface, and can be suitably slid. Also, a part of the oil supplied to the sliding contact surface is supplied between the solenoid cover 91 and the oil seal 95, and both can be suitably slid.

The above-described bearing portion suppresses the axial deviation between the shaft of the cylindrical solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20. Therefore, when the oil seal 95 is fixed to the housing 21, oil is prevented from leaking from between the oil seal 95 and the outer wall of the solenoid cover 91. Alternatively, when the oil seal 95 is fixed to the solenoid cover 91, the oil is prevented from leaking between the oil seal 95 and the inner wall of the housing 21.
The bearing portion is provided closer to the oil reservoir 77 than the oil seal 95. Therefore, oil can be supplied from the oil reservoir 77 to the bearing portion.

[solenoid]
The solenoid 90 is provided on one side of the valve timing adjusting mechanism 20 in the axial direction so as to face the valve timing adjusting mechanism 20. The solenoid 90 is provided inside the diameter of the solenoid cover 91. Therefore, the solenoid 90 is surrounded by the solenoid cover 91 on the outer periphery.
The solenoid 90 includes a solenoid body 96 and a pressing pin 92 that protrudes from the solenoid body 96 toward the spool 62.
The solenoid body 96 is activated by energization from an electronic control unit (ECU) (not shown), and drives the pressing pin 92 in the axial direction. The pressing pin 92 can press the spool 62 toward the spring 79 side.
The hydraulic pressure supplied to the advance chamber 45 and the retard chamber 46 is controlled by the movement of the spool 62. Thereby, the solenoid 90 controls the drive of the valve timing adjustment mechanism 20.

  The bearing 21 constituted by the solenoid cover 91 and the housing 21 adjusts the housing 21 and the solenoid 90 coaxially, and the rotation shaft of the housing 21 and the pressing pin 92 of the solenoid 90 are located on the same line. As a result, the pressing pin 92 of the solenoid 90 can reliably press the spool 62 provided on the rotating shaft of the housing 21.

Next, the operation of the valve timing adjustment system 1 will be described.
<When starting the engine>
As shown in FIGS. 1 and 2, when the engine 2 is stopped, the stopper piston 50 enters the inside of the ring 51, and the vane rotor 40 is phase-maintained at the most retarded angle position with respect to the housing 21. Immediately after the engine 2 is started, oil is not sufficiently supplied to the retard chamber 46, the advance chamber 45, the first pressure chamber 53, and the second pressure chamber 54, and the stopper piston 50 enters the inside of the ring 51. maintain. Therefore, it is possible to prevent the housing 21 and the vane rotor 40 from generating sound due to the torque fluctuation received by the camshaft 5 until the oil is supplied to each hydraulic chamber 30.

<After starting the engine>
When the oil is sufficiently supplied from the oil pump 191 to each hydraulic chamber 30 after the engine 2 is started, the stopper piston 50 resists the biasing force of the spring 52 by the hydraulic pressure of the first pressure chamber 53 and the second pressure chamber 54. Thus, the vane rotor 40 can be rotated relative to the housing 21.

<Advance angle operation>
When the valve timing adjustment system 1 is advanced, the solenoid 90 releases the force with which the pressing pin 92 pushes the spool 62 of the hydraulic control valve 60 toward the spring 79 in accordance with a command from the ECU. As a result, oil is supplied from the hydraulic pressure supply passage 18 to the advance chamber 45 through the supply port 65, the advance port 64, and the advance oil passage 47. On the other hand, the oil in the retardation chamber 46 passes through the retardation oil passage 48, passes through the retardation port 66 and the rear groove 73, and is discharged to the internal oil passage 76, the oil reservoir 77, and the discharge oil passage 68. Thereby, the hydraulic pressure of the advance chamber 45 acts on the vane 42, and the vane rotor 40 rotates in the advance direction with respect to the housing 21.

<At retarded angle operation>
When the valve timing adjustment system 1 operates at a retarded angle, the solenoid 90 pushes the spool 62 of the hydraulic control valve 60 to the spring 79 side by the pressing pin 92 according to a command from the ECU. As a result, oil is supplied from the hydraulic pressure supply passage 18 through the supply port 65, the retard port 66, and the retard oil passage 48 to the retard chamber 46. On the other hand, the oil in the advance chamber 45 is discharged from the advance oil passage 47 to the internal oil passage 76, the oil reservoir 77 and the discharge oil passage 68 through the advance port 64 and the front groove portion 71. Thereby, the hydraulic pressure in the retard chamber 46 acts on the vane 42, and the vane rotor 40 rotates in the retard direction with respect to the housing 21.

<Intermediate holding operation>
When the vane rotor 40 reaches the target phase, the hydraulic control valve 60 restricts the hydraulic pressure in the retard chamber 46 and the advance chamber 45 from being discharged to the oil pan 19. At this time, the hydraulic pressure is supplied from the hydraulic pressure supply passage 18 through the retard oil passage 48 and the advance oil passage 47 to the retard chamber 46 and the advance chamber 45, albeit slightly. As a result, the vane rotor 40 is held at the target phase.

<When the engine is stopped>
When the engine stop is instructed during the operation of the valve timing adjustment system 1, the vane rotor 40 rotates in the retard direction with respect to the housing 21 by the same operation as that in the retard operation described above, and stops at the most retarded position. To do. In this state, when the operation of the oil pump 191 is stopped and the pressure in the first pressure chamber 53 and the second pressure chamber 54 decreases, the stopper piston 50 enters the inside of the ring 51 by the biasing force of the spring 52. In this state, the engine 2 stops.

1st Embodiment has the following effects.
(1) In the first embodiment, a cylindrical solenoid cover 91 that surrounds the outer periphery of the solenoid 90 extends to the valve timing adjustment mechanism 20 side, and can slide on the inner surface 271 of the housing 21 provided in the valve timing adjustment mechanism 20. To fit.
Thereby, the position shift of the radial direction of the solenoid cover 91 and the valve timing adjustment mechanism 20 is suppressed. That is, the axial deviation between the shaft of the cylindrical solenoid cover 91 and the rotation shaft of the valve timing adjusting mechanism 20 is suppressed. For this reason, it is possible to prevent a gap caused by the shaft misalignment between the housing 21 and the oil seal 95 or between the solenoid cover 91 and the oil seal 95. Therefore, the valve timing adjustment system 1 can maintain oil tightness by the oil seal 95 and prevent unintended oil leakage due to shaft misalignment from the oil reservoir 77 to the space 16 in which the belt 9 is provided.

(2) In the first embodiment, an oil seal 95 is provided between the housing 21 and the solenoid cover 91.
As a result, unintentional oil leakage due to axial misalignment to the space 16 outside the housing 21 is reliably prevented, so that the valve timing adjustment system 1 can transmit power between the crankshaft 3 and the valve timing adjustment mechanism 20. A belt 9 can be used.
In addition, since the shaft portion of the solenoid cover 91 and the rotating shaft of the valve timing adjusting mechanism 20 are suppressed by the bearing portion, the thickness of the oil seal 95 becomes uniform in the circumferential direction. Therefore, the oil seal 95 can reliably prevent unintentional oil leakage due to shaft misalignment from the oil reservoir 77.

(3) In the first embodiment, the bearing portion into which the solenoid cover 91 and the valve timing adjustment mechanism 20 are fitted is provided on the oil reservoir 77 side with respect to the oil seal 95.
As a result, oil is supplied from the oil reservoir 77 to the sliding contact surface between the solenoid cover 91 and the valve timing adjusting mechanism 20 constituting the bearing portion. Therefore, since wear on the sliding contact surface is suppressed, the valve timing adjustment system 1 can suppress the axial deviation between the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20.

(4) In the first embodiment, the solenoid cover 91 is attached to the belt cover 12.
As a result, vibration transmitted from the engine 2 to the solenoid cover 91 via the valve timing adjustment mechanism 20 is absorbed by the belt cover 12. Therefore, the valve timing adjustment system 1 can suppress the axial deviation between the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20.
In the first embodiment, a solenoid cover 91 provided separately from the solenoid 90 is slidably fitted to the valve timing adjustment mechanism 20. Therefore, when the solenoid 90 is inspected or replaced, the solenoid 90 can be removed from the solenoid cover 91 while the solenoid cover 91 and the valve timing adjustment mechanism 20 are still fitted. Therefore, the oil in the oil reservoir 77 can be prevented from adhering to the belt 9.

(5) In the first embodiment, the inner diameter D <b> 1 of the bolt hole 94 included in the solenoid cover 91 is larger than the outer diameter D <b> 2 of the bolt 93.
Thereby, when the solenoid cover 91 and the belt cover 12 are fixed by the bolts 93, the difference between the inner diameter D1 of the bolt hole 94 and the outer diameter D2 of the bolt 93 is adjusted for the positional deviation between the solenoid cover 91 and the belt cover 12. Act as a bill. Therefore, when the bolt 93 is fixed in a state where the rotation axis of the valve timing adjustment mechanism 20 and the axis of the solenoid cover 91 are coaxial, the bolt hole 94 of the solenoid cover 91 has a position shift of the solenoid cover 91 with respect to the belt cover 12. It can be absorbed by the preparation cost.

(Second Embodiment)
A second embodiment of the present invention is shown in FIG. In the second embodiment, the solenoid cover 91 extends from the belt cover 12 to the valve timing adjustment mechanism 20 side, and is slidably fitted to the outer surface 211 of the housing 21 included in the valve timing adjustment mechanism 20. In other words, the inner surface of the solenoid cover 91 and the outer surface 211 of the housing 21 are in sliding contact with each other to form a bearing portion.
The oil seal 95 is provided on the outer diameter side of the bearing portion.
The second embodiment can achieve the same effects as the first embodiment.

(Third embodiment)
A third embodiment of the present invention is shown in FIG. In the third embodiment, the solenoid cover 91 extends from the belt cover 12 to the valve timing adjustment mechanism 20 side, and is slidably fitted to the outer surface 212 of the housing 21 included in the valve timing adjustment mechanism 20. That is, the bearing portion is configured by the sliding contact between the inner surface of the solenoid cover 91 and the outer surface 212 of the housing 21.
The oil seal 95 is provided closer to the solenoid 90 than the bearing portion.
The third embodiment can achieve the same effects as the first and second embodiments.

(Fourth embodiment)
A fourth embodiment of the present invention is shown in FIG. In 4th Embodiment, the bushing 43 which the vane rotor 40 has is formed in the bottomed cylinder shape. The cylindrical portion 56 of the bushing 43 is inserted through the central hole 27 of the front wall 24 of the housing vane 22 and protrudes from the central hole 27 to the solenoid 90 side.
In the fourth embodiment, the solenoid cover 91 extends from the belt cover 12 to the valve timing adjustment mechanism 20 side, and is slidably fitted to the outer surface 431 of the bushing 43 of the vane rotor 40. In other words, the bearing portion is configured by the sliding contact between the inner surface of the solenoid cover 91 and the outer surface 431 of the bushing 43 of the vane rotor 40.
The oil seal 95 is provided on the outer diameter side of the bearing portion.
The fourth embodiment can achieve the same operational effects as the first to third embodiments.

(Fifth embodiment)
A fifth embodiment of the present invention is shown in FIG. Also in the fifth embodiment, the bushing 43 of the vane rotor 40 passes through the central hole 27 of the front wall 24 of the housing vane 22.
In the fifth embodiment, the solenoid cover 91 extends from the belt cover 12 to the valve timing adjustment mechanism 20 side, and is slidably fitted to a radially inner surface 432 of the bushing 43 of the vane rotor 40. In other words, the bearing portion is configured by the sliding contact between the inner surface of the solenoid cover 91 and the inner surface 432 of the bushing 43 of the vane rotor 40.
The oil seal 95 is provided closer to the solenoid 90 than the bearing portion.
The fifth embodiment can achieve the same effects as the first to fourth embodiments.

(Sixth embodiment)
A sixth embodiment of the present invention is shown in FIGS. In the sixth embodiment, the solenoid cover 91 and the valve timing adjustment mechanism 20 are not fitted. Instead, as shown in FIG. 9, the inner diameter D3 of the solenoid cover 91 is the same as the inner diameter D4 of the central hole 27 of the front wall 24 of the housing vane 22.
In the sixth embodiment, “the central hole 27 of the front wall 24 of the housing vane 22” corresponds to an example of “a cylindrical portion provided on the solenoid side of the valve timing adjustment mechanism” recited in the claims.

A manufacturing method of the valve timing adjustment system 1 of the sixth embodiment will be described with reference to FIGS. 10 and 11.
First, as the connection step 101, the vane rotor 40 of the valve timing adjustment mechanism 20 is connected to the camshaft 5 by a bolt-shaped sleeve 61.
Next, as the alignment step 102, as shown in FIG. 10, the jig 200 that can contact the inner wall of the solenoid cover 91 and the inner wall of the central hole 27 of the housing vane 22 is attached from the inner side of the solenoid cover 91 to the central hole 27. Insert inside. The outer diameter of the jig 200 used in the sixth embodiment is the same as or slightly the same as the inner diameter D3 of the solenoid cover 91 and the inner diameter D4 of the central hole 27 of the housing vane 22 from one end to the other end in the axial direction. small. As a result, the jig 200 abuts against the inner wall of the solenoid cover 91 and the inner wall of the central hole 27 of the housing vane 22. Therefore, the solenoid cover 91 and the valve timing adjusting mechanism 20 are adjusted coaxially by the jig 200.

After the alignment step 102 described above, as a solenoid cover mounting step 103, a bolt 93 is passed through a bolt hole 94 of the solenoid cover 91, and the bolt 93 is screwed into a female screw 121 formed on the belt cover 12. As a result, the solenoid cover 91 and the belt cover 12 are fixed. The inner diameter D1 of the bolt hole 94 of the solenoid cover 91 is larger than the outer diameter D2 of the bolt 93. Therefore, even if the position of the solenoid cover 91 is slightly deviated from the belt cover 12, the bolt 93 remains in the solenoid cover 91. And the belt cover 12 can be fixed.
After fixing the solenoid cover 91 and the belt cover 12, the jig 200 is removed from the central hole 27 of the housing vane 22 and the solenoid cover 91.
Thereafter, as a solenoid mounting step 104, the solenoid 90 is mounted inside the solenoid cover 91. Thereby, the valve timing adjustment system 1 is completed.

In the sixth embodiment, the inner diameter D3 of the solenoid cover 91 is the same as the inner diameter D4 of the central hole 27 provided on the solenoid 90 side of the valve timing adjustment mechanism 20.
Thereby, when manufacturing the valve timing adjustment system 1, the jig 200 is inserted into the central hole 27 of the housing 21 provided in the valve timing adjustment mechanism 20 from the inside of the solenoid cover 91, and the solenoid cover 91, the valve timing adjustment mechanism 20, Can be adjusted coaxially. Therefore, the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjusting mechanism 20 can be coaxially assembled.

(Seventh embodiment)
A seventh embodiment of the present invention is shown in FIGS. In the seventh embodiment, the inner diameter D3 of the solenoid cover 91 is larger than the inner diameter D4 of the central hole 27 of the front wall 24 of the housing vane 22.
In the seventh embodiment, “the central hole 27 of the front wall 24 of the housing vane 22” corresponds to an example of “a cylindrical portion provided on the solenoid side of the valve timing adjustment mechanism” recited in the claims.

As shown in FIG. 13, in the seventh embodiment, as in the sixth embodiment described above, the jig 201 is used when the valve timing adjustment system 1 is manufactured, and the solenoid cover 91, the valve timing adjustment mechanism 20, and the like. Adjust to the same axis.
The jig 201 used at the time of manufacturing the valve timing adjustment system 1 of the seventh embodiment includes a part that can contact the inner wall of the solenoid cover 91 and a part that can contact the inner wall of the central hole 27 of the housing vane 22. Have. The outer diameter of the portion of the jig 201 that can contact the inner wall of the solenoid cover 91 is the same as or slightly smaller than the inner diameter of the solenoid cover 91. In addition, the outer diameter of the portion of the jig 201 that can contact the inner wall of the central hole 27 of the housing vane 22 is the same as or slightly smaller than the inner diameter D4 of the central hole 27 of the housing vane 22. As a result, the jig 201 comes into contact with the inner wall of the solenoid cover 91 and the inner wall of the central hole 27 of the housing vane 22. Therefore, the solenoid cover 91 and the valve timing adjusting mechanism 20 can be adjusted coaxially by the jig 201.
In the seventh embodiment, the same operational effects as in the sixth embodiment can be obtained.

(Eighth embodiment)
An eighth embodiment of the present invention is shown in FIGS. In the eighth embodiment, the inner diameter D3 of the solenoid cover 91 is larger than the inner diameter D5 of the cylindrical portion 56 of the bushing 43 included in the vane rotor 40.
In the eighth embodiment, “the cylindrical portion 56 of the bushing 43 included in the vane rotor 40” corresponds to an example of “a cylindrical portion provided on the solenoid side of the valve timing adjustment mechanism” recited in the claims.

As shown in FIG. 15, also in the eighth embodiment, the jig 202 is used to adjust the solenoid cover 91 and the valve timing adjustment mechanism 20 coaxially when the valve timing adjustment system 1 is manufactured.
The jig 202 used at the time of manufacturing the valve timing adjusting system 1 of the eighth embodiment can contact the inner wall of the solenoid cover 91 and the inner wall of the cylindrical portion 56 of the bushing 43 of the vane rotor 40. It has a site. The outer diameter of the portion of the jig 202 that can contact the inner wall of the solenoid cover 91 is the same as or slightly smaller than the inner diameter D3 of the solenoid cover 91. Moreover, the outer diameter of the part which can contact | abut to the inner wall of the cylindrical part 56 of the bushing 43 which the vane rotor 40 has among the jig | tool 202 is the same as the internal diameter D5 of the cylindrical part 56 of the bushing 43 which the vane rotor 40 has. Or slightly smaller. As a result, the jig 202 abuts against the inner wall of the solenoid cover 91 and the inner wall of the cylindrical portion 56 of the bushing 43 included in the vane rotor 40. Therefore, the solenoid cover 91 and the valve timing adjusting mechanism 20 can be adjusted coaxially by the jig 202.
In the eighth embodiment, the same operational effects as those of the sixth and seventh embodiments can be obtained.

(Ninth embodiment)
A ninth embodiment of the present invention is shown in FIG. In the ninth embodiment, the valve timing adjusting mechanism 20 has a drain hole 57 that communicates an oil discharge space 15 that is open to the outside of the camshaft 5 and an oil reservoir 77. The drain hole 57 communicates the front wall 24 of the housing vane 22, the vane rotor 40, and the rear cover 23 in the rotation axis direction of the valve timing adjustment mechanism 20.
In the ninth embodiment, oil can be discharged from the oil reservoir 77 to the oil discharge space 15 through the drain hole 57. Therefore, the oil pressure acting on the oil seal 95 from the oil reservoir 77 is reduced, so that oil tightness by the oil seal 95 is maintained and oil is prevented from leaking from the oil reservoir 77 into the space 16 where the belt 9 is provided. it can.

(10th Embodiment)
A tenth embodiment of the present invention is shown in FIGS. In the cross-sectional view of FIG. 18, the configuration outside the diameter from the solenoid cover 91 is omitted.
In the tenth embodiment, the bearing portion has a plurality of oil grooves 97 on the outer wall on the radially outer side of the cylindrical portion 56 of the bushing 43. The plurality of oil grooves 97 extend in the rotation axis direction of the valve timing adjustment mechanism 20. The plurality of oil grooves 97 are provided at substantially equal intervals over the circumferential direction of the cylindrical portion 56 of the bushing 43. The plurality of oil grooves 97 communicate with the oil reservoir 77.
In the tenth embodiment, oil can be supplied from the oil groove 97 to the sliding contact surface between the solenoid cover 91 and the bushing 43. Therefore, wear of the sliding contact surface is suppressed even with aging. Therefore, the valve timing adjustment system 1 can suppress the axial deviation between the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20.

(Eleventh embodiment)
FIG. 19 shows a cross-sectional view of essential parts of an eleventh embodiment of the present invention. In the cross-sectional view of FIG. 19, the configuration outside the solenoid cover 91 is omitted as in the cross-sectional view of FIG.
In the eleventh embodiment, the bearing portion has a plurality of oil grooves 98 on the inner wall on the inner diameter side of the solenoid cover 91. The plurality of oil grooves 98 extend in the axial direction of the solenoid cover 91. The plurality of oil grooves 98 are provided at substantially equal intervals in the circumferential direction of the solenoid cover 91. The plurality of oil grooves 98 communicate with the oil reservoir 77.
The eleventh embodiment can achieve the same effects as the tenth embodiment.

(Twelfth embodiment)
A twelfth embodiment of the present invention is shown in FIG. In the twelfth embodiment, a grommet 99 as a buffer member is provided in the bolt hole 94 of the solenoid cover 91. The grommet 99 is formed in a ring shape from, for example, rubber, elastomer or silicone, and is provided between the inner wall of the bolt hole 94 and the bolt 93.
In the twelfth embodiment, vibration transmitted from the engine 2 to the solenoid cover 91 via the valve timing adjustment mechanism 20 can be absorbed by the grommet 99. Therefore, the valve timing adjustment system 1 can suppress the axial deviation between the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20.

(13th Embodiment)
A thirteenth embodiment of the present invention is shown in FIG. In the thirteenth embodiment, the valve timing adjustment mechanism 20 includes an assist spring 58 outside the diameter of the bushing 43. The assist spring 58 is a torsion coil spring, and one end is locked to a pin 59 fixed to the front wall 24 of the housing 21, and the other end is locked to a groove 591 provided in the bushing 43. The assist spring 58 urges the vane rotor 40 in the advance direction with respect to the housing 21.
In the thirteenth embodiment, by providing the assist spring 58 in the oil reservoir 77, the oil in the oil reservoir 77 can be supplied to the assist spring 58. Therefore, wear of the assist spring 58 due to secular change is suppressed.

(14th Embodiment)
A fourteenth embodiment of the present invention is shown in FIG. In the fourteenth embodiment, similar to the thirteenth embodiment, the valve timing adjustment mechanism 20 includes an assist spring 58 in the oil reservoir 77.
Further, in the fourteenth embodiment, the radially inner surface of the solenoid cover 91 and the radially outer surface 212 of the housing 21 are slidably fitted to form a bearing portion. An oil seal 95 is provided on the side opposite to the solenoid 90 from the bearing portion.
In the fourteenth embodiment, in the valve timing adjustment system 1 including the assist spring 58, it is possible to suppress the axial deviation between the shaft of the solenoid cover 91 and the rotation shaft of the valve timing adjustment mechanism 20.

(Fifteenth embodiment)
A fifteenth embodiment of the present invention is shown in FIG. In the fifteenth embodiment, the radially inner surface of the solenoid cover 91 and the radially outer surface 611 of the sleeve 61 of the hydraulic control valve 60 are slidably fitted to form a bearing portion. The radially outer surface 611 of the head portion 63 of the sleeve 61 constituting the bearing portion is formed in a cylindrical shape.
An oil seal 95 is provided on the solenoid 90 side of the bearing portion.
Also in the fifteenth embodiment, it is possible to achieve the same operational effects as those of the first to fifth embodiments described above.

(Other embodiments)
(1) In the above-described embodiment, the valve timing adjustment system 1 that adjusts the opening / closing timing of the intake valve 10 has been described. On the other hand, in another embodiment, the valve timing adjustment system 1 may adjust the opening / closing timing of the exhaust valve 11.

  (2) In the embodiment described above, the valve timing adjustment mechanism 20 is fixed to the camshaft 5 of the engine 2. On the other hand, in another embodiment, the valve timing adjustment mechanism 20 may be fixed to the camshaft 5 of the engine 2.

(3) In the embodiment described above, the oil seal 95 is fixed to the front wall 24 of the housing 21 and attached so as to be in sliding contact with the outer wall of the solenoid cover 91. On the other hand, in another embodiment, the oil seal 95 may be configured to be press-fitted and fixed to the solenoid cover 91 and to be in sliding contact with the wall of the housing 21.
In this case, the housing 21 is in sliding contact with the oil seal 95 fixed to the solenoid cover 91 while rotating. At this time, the outer surface of the solenoid cover 91 and the inner surface of the housing 21 are slidably engaged with each other, and there is a slight gap that can slide between the slidable surfaces. A part of the oil is supplied to the sliding contact surface, and can be suitably slid. Also, a part of the oil supplied to the sliding contact surface is supplied between the housing 21 and the oil seal 95, and both can be suitably slid.

(4) In the embodiment described above, the oil seal 95 is press-fitted and fixed to the front wall 24 of the housing 21. On the other hand, in other embodiments, the oil seal 95 may be fixed by fitting into a groove (not shown) provided in the front wall 24 of the housing 21 or fixed to the front wall 24 of the housing 21 by adhesion. May be. Similarly, when the oil seal is fixed to the solenoid cover, it can be fixed by various methods.
Thus, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 ... Valve timing adjustment system 20 ... Valve timing adjustment mechanism 90 ... Solenoid 91 ... Solenoid cover 271 ... Inner wall surface (surface inside diameter of valve timing adjustment mechanism) of housing
211 ... The outer surface of the housing (the outer surface of the valve timing adjustment mechanism)
212 ... The outer surface of the housing (the outer surface of the valve timing adjustment mechanism)
431... Outside surface of bushing (surface outside diameter of valve timing adjustment mechanism)
432 ... Diameter inside surface of bushing (surface inside diameter of valve timing adjustment mechanism)

Claims (13)

It rotates with the drive shaft (3) or driven shaft (5, 6) of the engine (2), transmits torque from the drive shaft to the driven shaft, and changes the relative rotational phase between the drive shaft and the driven shaft. A valve timing adjusting mechanism (20) for adjusting the opening / closing timing of the valves (10, 11) driven to open / close by the driven shaft;
A solenoid (90) provided opposite to the valve timing adjustment mechanism on one side in the rotational axis direction of the valve timing adjustment mechanism, and controlling the drive of the valve timing adjustment mechanism;
It is formed in a cylindrical shape, surrounds the outer periphery of the solenoid, extends to the valve timing adjustment mechanism side, and slidably fits on the radially inner surface (432) or the radially outer surface (431) of the valve timing adjustment mechanism. A solenoid cover (91) for
The valve timing adjustment mechanism is
A housing (21) that is rotated by transmitting a driving force of the driving shaft;
A rotor (41) fixed to the driven shaft and a hydraulic chamber (30) extending radially outward from the rotor and formed inside the housing are partitioned into an advance chamber (45) and a retard chamber (46). A vane rotor (40) having a vane (42) and rotatable relative to the housing;
The vane rotor has a cylindrical bushing (43) that is fixed to the rotor and protrudes from a hole provided in the housing to the solenoid side,
The valve timing adjustment system (1), wherein the solenoid cover is in sliding contact with a radially inner surface (432) or a radially outer surface (431) of the bushing. It rotates with the drive shaft (3) or driven shaft (5, 6) of the engine (2), transmits torque from the drive shaft to the driven shaft, and changes the relative rotational phase between the drive shaft and the driven shaft. A valve timing adjusting mechanism (20) for adjusting the opening / closing timing of the valves (10, 11) driven to open / close by the driven shaft;
A solenoid (90) provided opposite to the valve timing adjustment mechanism on one side in the rotational axis direction of the valve timing adjustment mechanism, and controlling the drive of the valve timing adjustment mechanism;
A solenoid cover that is formed in a cylindrical shape, surrounds the outer periphery of the solenoid, extends toward the valve timing adjustment mechanism, and is slidably fitted to a radially inner surface or a radially outer surface (611) of the valve timing adjustment mechanism. (91)
The valve timing adjustment mechanism includes a hydraulic control valve (60) that is fixed at a rotation center of the valve timing adjustment mechanism and switches a hydraulic pressure supplied to the valve timing adjustment mechanism.
The valve timing adjustment system (1), wherein the solenoid cover is slidably fitted to a surface (611) outside the diameter of the hydraulic control valve.   An annular space provided between the housing and the solenoid cover, and a space outside the housing and the solenoid cover from an oil sump (77) formed between the inner diameter of the solenoid cover and the valve timing adjustment mechanism. The valve timing adjustment system according to claim 1 or 2, further comprising an oil seal (95) for preventing oil leakage to (16).   The portion where the inner surface or the outer surface of the valve timing adjustment mechanism and the solenoid cover are slidably fitted to each other is provided on the oil reservoir side with respect to the oil seal. 3. The valve timing adjustment system according to 3.   The valve timing adjustment system according to claim 3 or 4, further comprising an assist spring (58) provided in the oil reservoir and biasing the vane rotor in an advance direction with respect to the housing.   The drain timing (57) which is formed so that the said valve timing adjustment mechanism may be connected to a rotating shaft direction, and connects the oil discharge space (15) open | released to air | atmosphere and the said oil reservoir is provided. 6. The valve timing adjustment system according to any one of 5 above.   Provided in at least one of the solenoid cover and the valve timing adjusting mechanism side at a location where the solenoid cover and the valve timing adjusting mechanism are in sliding contact with each other, oil grooves (97, 98) communicating with the oil reservoir are provided. The valve timing adjustment system according to any one of claims 1 to 6, wherein   The said solenoid cover is attached to the belt cover (12) which protects the belt (9) which transmits the driving force of the said drive shaft to the said valve timing adjustment mechanism. The valve timing adjustment system described in 1. A bolt (93) for inserting the solenoid cover and the belt cover through the bolt hole (94) of the solenoid cover;
The valve timing adjustment system according to claim 8, wherein an inner diameter (D1) of the bolt hole of the solenoid cover is larger than an outer diameter (D1) of the bolt.   The valve timing adjusting system according to claim 9, further comprising an annular buffer member (99) provided between an inner wall of the bolt hole of the solenoid cover and the bolt. The driven shaft rotates with the drive shaft or driven shaft of the engine, transmits torque from the drive shaft to the driven shaft, and changes the relative rotational phase between the drive shaft and the driven shaft, thereby driving the driven shaft to open and close. A valve timing adjustment mechanism for adjusting the opening and closing timing of the valve;
A solenoid provided on one side of the valve timing adjustment mechanism in the rotational axis direction so as to face the valve timing adjustment mechanism, and for controlling driving of the valve timing adjustment mechanism;
A solenoid cover that is formed in a cylindrical shape and surrounds the outer periphery of the solenoid, and extends toward the valve timing adjustment mechanism so as not to be slidably fitted to a radially inner surface and a radially outer surface of the valve timing adjustment mechanism; With
An inner diameter (D3) of the solenoid cover is equal to or larger than an inner diameter (D4, D5) of a cylindrical portion (27, 56) provided on the solenoid side of the valve timing adjusting mechanism. Valve timing adjustment system. The driven shaft rotates with the drive shaft or driven shaft of the engine, transmits torque from the drive shaft to the driven shaft, and changes the relative rotational phase between the drive shaft and the driven shaft, thereby driving the driven shaft to open and close. A valve timing adjustment mechanism for adjusting the opening and closing timing of the valve;
A solenoid provided on one side of the valve timing adjustment mechanism in the rotational axis direction so as to face the valve timing adjustment mechanism, and for controlling driving of the valve timing adjustment mechanism;
A solenoid cover that is formed in a cylindrical shape and surrounds the outer periphery of the solenoid and extends toward the valve timing adjustment mechanism,
A gap is formed in the axial direction between the end of the solenoid cover on the valve timing adjustment mechanism side and the valve timing adjustment mechanism,
An inner diameter (D3) of the solenoid cover is equal to or larger than an inner diameter (D4, D5) of a cylindrical portion (27, 56) provided on the solenoid side of the valve timing adjusting mechanism. Valve timing adjustment system. A method for manufacturing a valve timing adjustment system according to claim 11 or 12,
A connection step (101) for connecting the valve timing adjusting mechanism to the driven shaft;
A jig (200, 201, 202) capable of contacting the inner wall of the solenoid cover and the inner wall of the tube portion of the valve timing adjustment mechanism is provided from the inside of the solenoid cover to the inside of the tube portion of the valve timing adjustment mechanism. An alignment step (102) in which the solenoid cover and the valve timing adjustment mechanism are adjusted coaxially.
A solenoid cover attaching step (103) for attaching the solenoid cover to a belt cover protecting the belt that transmits the torque of the drive shaft to the valve timing adjusting mechanism after the alignment step;
And a solenoid mounting step (104) for attaching the solenoid to the inside of the solenoid cover after removing the jig from the cylinder portion and the solenoid cover of the valve timing adjustment mechanism. System manufacturing method.

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