JP2015175310A - Valve timing adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve timing adjustment device capable of improving position accuracy of a spool in an axial direction.SOLUTION: A valve timing adjustment device includes a valve cover assembly 60. The valve cover assembly 60 includes a valve cover 61, a diaphragm 71, a shaft 75 and a bushing 82. The valve cover 61 is fixed to a front cover 21 and includes an opening portion 67 on an extension of an axial center 55 of a spool 48. The diaphragm 71 closes the opening portion 67 of the valve cover 61. The shaft 75 is provided coaxially with the spool 48, and can fix an inner circumferential portion 72 of the diaphragm 71 and press the spool 48 in an axial direction. The bushing 82 is fixed to the valve cover 61 while holding an outer circumferential portion 73 of the diaphragm 71 between the bushing 82 and the valve cover 61, and supports the shaft 75 axially slidably while keeping the coaxiality between the shaft 75 and the spool 48.

Description

  The present invention relates to a valve timing adjusting device.

  The hydraulic valve timing adjusting device adjusts the valve timing of an intake valve or an exhaust valve of an internal combustion engine by supplying hydraulic oil to a hydraulic chamber in a housing and relatively rotating a vane rotor. The hydraulic oil is supplied to the hydraulic chamber by an oil passage switching valve provided at the center of the vane rotor.

  By the way, when the timing pulley is provided integrally with the housing, it is necessary to prevent the hydraulic oil in the hydraulic chamber from leaking to the outside and being applied to the timing pulley. On the other hand, in patent document 1, the opening part on the opposite side to a cam shaft among the housings is closed with a diaphragm. A disk member is provided at the center of the diaphragm. The actuator in the external space can press the spool of the oil passage switching valve in the axial direction via the disk member.

Japanese Patent Laid-Open No. 5-214907

However, in the prior art of Patent Document 1, the disk member of the diaphragm is provided so as to be movable in the radial direction, and the radial position is not fixed. Therefore, there is a possibility that the disk member is displaced in the radial direction due to vibration or the like during traveling of the vehicle. If the actuator generates a pressing force while the disk member is displaced in the radial direction, a desired stroke is not transmitted to the spool. Therefore, there has been a problem that the positional accuracy of the spool in the axial direction is lowered.
The present invention has been made in view of the above points, and an object of the present invention is to provide a valve timing adjusting device capable of improving the positional accuracy of the spool in the axial direction.

  The valve timing adjusting device according to the present invention includes a timing pulley, a housing, a vane rotor, a sleeve, and a spool. When one of the driving shaft and the driven shaft of the internal combustion engine is the first shaft and the other is the second shaft, the timing pulley can rotate integrally with the first shaft, and the vane rotor is fixed to the end of the second shaft. Yes. The housing is provided integrally with the timing pulley. The vane rotor forms a vane that partitions the internal space of the housing into an advance chamber and a retard chamber. The sleeve is a cylindrical member provided in the central portion of the vane rotor, and is connected to a supply port that can communicate with an external oil supply source, an advance port that communicates with an advance chamber, and a retard chamber. Has a retarding port. The spool is provided coaxially with the second shaft, and is movable in the axial direction inside the sleeve. The spool is switched between communication and blocking between the supply port and the advance port according to the axial position, and the spool is connected to the supply port. Switch between communication and disconnection with the square port.

  The valve timing adjusting device further includes a valve cover, a diaphragm, a shaft, and a bushing. The valve cover is provided on the opposite side of the housing from the second shaft, is fixed to the housing, and has an opening on the extension of the shaft center of the spool. The diaphragm blocks the opening of the valve cover. The shaft is provided coaxially with the spool, fixes the inner peripheral portion of the diaphragm, and can press the spool in the axial direction. The bushing is fixed to the valve cover while sandwiching the outer peripheral portion of the diaphragm between the valve cover and supports the shaft so as to be slidable in the axial direction while maintaining the coaxiality of the shaft and the spool.

  By configuring the shaft to be aligned by the bushing in this way, it is possible to prevent the shaft from being displaced in the radial direction with respect to the spool. Accordingly, it is possible to avoid a decrease in the positional accuracy of the spool in the axial direction due to the shaft being inclined with respect to the spool or the shaft being eccentric with respect to the spool.

It is sectional drawing explaining schematic structure of the valve timing adjustment apparatus by 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a figure which shows the valve timing adjustment apparatus of FIG. FIG. 4 is an enlarged view of a portion IV in FIG. 3. It is the VV sectional view taken on the line of FIG. It is sectional drawing explaining the valve timing adjustment apparatus by 2nd Embodiment of this invention. It is sectional drawing explaining the valve timing adjustment apparatus by 3rd Embodiment of this invention. It is sectional drawing explaining the valve timing adjustment apparatus by 4th Embodiment of this invention. It is sectional drawing explaining the valve timing adjustment apparatus by 5th Embodiment of this invention. It is sectional drawing explaining the valve timing adjustment apparatus by 6th Embodiment of this invention.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the embodiments, substantially the same components are denoted by the same reference numerals and description thereof is omitted.
<First Embodiment>
A valve timing adjusting device according to a first embodiment of the present invention is shown in FIG. The valve timing adjusting device 10 adjusts the valve timing of an intake valve (not shown) that opens and closes the camshaft 202 by rotating the camshaft 202 relative to the crankshaft 201 of the internal combustion engine 200. To the camshaft 202 is provided in the driving force transmission system. The crankshaft 201 is a “drive shaft” described in the claims, and the camshaft 202 is a “driven shaft” described in the claims.

The valve timing adjustment device 10 includes a phase adjustment mechanism 20, an oil passage switching valve 40, and a valve cover assembly 60.
[Phase adjustment mechanism]
First, the phase adjustment mechanism 20 will be described with reference to FIGS. The phase adjustment mechanism 20 includes a front cover 21, a rear cover 25, a timing pulley 27, a vane rotor 32, and the like.
The front cover 21 has a cup shape, and forms a plurality of protrusions 22 that protrude radially inward from the outer shell. Each protrusion part 22 is arrange | positioned so that it may mutually space apart in the circumferential direction.
The rear cover 25 is provided on the opening end side of the front cover 21 and has a through hole 26 through which the cam shaft 202 is inserted.

The timing pulley 27 includes a cylindrical tooth portion 28 located on the radially outer side with respect to the front cover 21, and a flange portion 29 located on the opposite side of the front cover 21 with respect to the rear cover 25. The flange portion 29 is fastened to the front cover 21 by a bolt 31 together with the rear cover 25.
The front cover 21 and the rear cover 25 constitute a “housing” described in the claims, are connected to the crankshaft 201 via a timing belt 203 that is hung on the timing pulley 27, and can rotate integrally with the crankshaft 201. is there.

  The vane rotor 32 divides the space between the boss 33 fixed to the end of the cam shaft 202 in the front cover 21 and the protrusions 22 of the front cover 21 into the advance chamber 23 and the retard chamber 24. A plurality of vanes 34 are formed. The vane rotor 32 is fixed to the cam shaft 202 by a sleeve bolt 41 described later, and can rotate integrally with the cam shaft 202. The retard chamber 24 is positioned in the rotation direction with respect to the vane 34, and the advance chamber 23 is positioned in the reverse rotation direction with respect to the vane 34.

Further, the vane rotor 32 has a supply oil passage 35, an advance oil passage 36, and a retard oil passage 37. The supply oil passage 35 communicates with an oil pump 206 that is an external oil supply source via a supply oil passage 204 of the camshaft 202 and a supply oil passage 205 such as an engine block, and the inner wall surface of the boss 33. Is open. The advance oil passage 36 communicates with the advance chamber 23 and opens in the inner wall surface of the boss 33. The retard oil passage 37 communicates with the retard chamber 24 and opens in the inner wall surface of the boss 33.
The vane rotor 32 rotates relative to the front cover 21 by receiving the pressure of the hydraulic oil supplied to the advance chamber 23 or the retard chamber 24, and changes the rotational phase relative to the front cover 21 to the advance side or the retard side. Let

[Oil path switching valve]
Next, the oil passage switching valve 40 will be described with reference to FIGS. The oil passage switching valve 40 includes a sleeve bolt 41 and a spool 48.
The sleeve bolt 41 is inserted into the vane rotor 32 from the side opposite to the cam shaft 202 and fastened to the cam shaft 202. The sleeve bolt 41 forms a sleeve 44 between the head portion 42 and the screw portion 43. The sleeve 44 is formed in a cylindrical shape so as to extend in the axial direction at the center of the boss 33, and has a supply port 45, an advance port 46, and a retard port 47. The supply port 45 communicates with the supply oil passage 35. The advance port 46 communicates with the advance oil passage 36. The retard port 47 communicates with the retard oil passage 37.

  The spool 48 is movable in the axial direction inside the sleeve 44, and each port of the sleeve 44 can be selectively connected according to the axial position. Specifically, when the rotation phase of the vane rotor 32 with respect to the front cover 21 is changed to the advance side, the spool 48 connects the supply port 45 and the advance port 46 while connecting the retard port 47 and the inside of the spool 48. The oil passage 51 is connected. The internal oil passage 51 communicates with an external drain space through the internal oil passage 52 of the screw portion 43, the internal oil passage 207 of the cam shaft 202, and the like. Further, the spool 48 connects the advance port 46 and the internal oil passage 51 while connecting the supply port 45 and the retard port 47 when changing the rotation phase of the vane rotor 32 with respect to the front cover 21 to the retard side. To do.

  A stopper plate 53 is fitted inside the head portion 42 of the sleeve bolt 41, and the spool 48 is urged toward the stopper plate 53 by a spring 54. The axial position of the spool 48 is determined by the axial position of the rod 209 of the solenoid 208 provided on the side opposite to the spool 48 with respect to the stopper plate 53.

[Valve cover assembly]
Next, a valve cover assembly 60 that is a characteristic configuration of the present embodiment will be described with reference to FIGS. 1 and 3 to 5. The valve cover assembly 60 includes a valve cover 61, a diaphragm 71, a shaft 75, a bushing 82, and the like.

  The valve cover 61 forms a large diameter cylindrical portion 62, a flange portion 63, an annular portion 64, and a small diameter cylindrical portion 65. The bottom portion of the front cover 21 has a convex portion 38 that protrudes in the axial direction outward in the radial direction with respect to the head portion 42 of the sleeve bolt 41, and the large-diameter cylindrical portion 62 is fitted to the convex portion 38. The large-diameter cylindrical portion 62 forms a “concave portion” described in the claims. The flange portion 63 protrudes radially outward from the end portion of the large-diameter cylindrical portion 62 on the front cover 21 side, and a plurality of circumferential locations are fixed to the front cover 21 by bolts 66. The annular portion 64 protrudes radially inward from the end of the large-diameter cylindrical portion 62 opposite to the flange portion 63. The small-diameter cylindrical portion 65 protrudes from the inner peripheral portion of the annular portion 64 toward the sleeve bolt 41, and has an opening 67 on the extension of the shaft center 55 of the spool 48.

  The diaphragm 71 is formed in an annular shape and is provided so as to close the opening 67. The inner peripheral portion 72 of the diaphragm 71 is movable in the axial direction with respect to the outer peripheral portion 73. The inner peripheral portion 72 and the outer peripheral portion 73 are formed to have a greater axial thickness than the thin film portion 74 connecting them.

  The shaft 75 includes a first shaft 76 and a second shaft 78. The first shaft 76 is located between the inner peripheral portion 72 of the diaphragm 71 and the spool 48, and is provided coaxially with the spool 48. The first shaft 76 has a bottomed press-fitting hole 77 that opens to the end surface on the inner peripheral portion 72 side. The second shaft 78 is formed with a sandwiching portion 79 that is fixed with the inner peripheral portion 72 of the diaphragm 71 sandwiched between the first shaft 76 and a press-fit shaft portion 81 that is press-fitted into the press-fit hole 77. Yes. The first shaft 76 is in contact with the spool 48. The side opposite to the first shaft 76 of the sandwiching portion 79 of the second shaft 78 is exposed to the external space where the timing pulley 27 is exposed, and is in contact with the rod 209 of the solenoid 208. The shaft 75 can press the spool 48 in the axial direction. Hereinafter, the “external space” means a space where the timing pulley 27 is exposed.

  The bushing 82 includes a clamping portion 83 that fixes the outer peripheral portion 73 of the diaphragm 71 between the sleeve bolt 41 and the valve cover 61 between the small diameter cylindrical portion 65 of the valve cover 61 and the clamping portion 83 to the valve. A cylindrical press-fit cylinder part 84 that protrudes toward the cover 61 and is press-fitted into the small-diameter cylinder part 65 is formed. The second shaft 78 is inserted through the through hole 85 of the clamping portion 83. The clamping portion 83 supports the shaft 75 so as to be slidable in the axial direction while maintaining the coaxiality of the shaft 75 and the spool 48 by the inner wall surface of the through hole 85.

  The first shaft 76 has a flat surface 86 formed in a part of the outer wall surface in the circumferential direction so that the cross-sectional shape perpendicular to the axis is D-shaped. As with the first shaft 76, the through-hole 85 has a flat surface 87 formed in a part of the inner wall surface in the circumferential direction so that the cross-sectional shape perpendicular to the axis is D-shaped. The first shaft 76 is prevented from rotating by the plane 86 engaging with the plane 87 of the through hole 85. The flat surface 86 and the flat surface 87 constitute a detent means for restricting relative rotation between the shaft 75 and the bushing 82.

  The flat surface 86 of the first shaft 76 is formed at an intermediate portion and an end portion on the spool 48 side in the axial direction. The end portion 89 on the diaphragm 71 side of the first shaft 76 is located on the radially outer side with respect to the plane 86. The end portion 89 functions as a stopper that restricts the movement of the first shaft 76 toward the spool 48. Thereby, the stroke of the shaft 75 can be regulated so that the deformation of the diaphragm 71 does not exceed the allowable range.

  The bushing 82 has a through hole 88 that connects a space 91 between the bushing 82 and the diaphragm 71 to a space 92 between the front cover 21 and the valve cover 61. The space 92 is connected to the lubrication space 210 of the internal combustion engine 200 via the drain oil passage 93. The drain oil passage 93 includes a first drain oil passage 94 of the front cover 21, a second drain oil passage 95 of the vane rotor 32, a third drain oil passage 96 of the washer 39, and a fourth drain oil passage 97 of the rear cover 25. ing. The hydraulic fluid leaking from the advance chamber 23 and the retard chamber 24 into the space 92 can be discharged to the lubrication space 210 via the drain oil passage 93. A seal member 211 is provided between the lubrication space 210 and the external space.

  The inner peripheral portion 72 of the diaphragm 71 is crushed in the axial direction by the first shaft 76 and the second shaft 78, and seals between the space 91 and the external space in an oil-tight manner. Further, the outer peripheral portion 73 of the diaphragm 71 is crushed in the axial direction by the bushing 82 and the valve cover 61, and the space 91 and the external space are sealed in an oil-tight manner.

An O-ring 98 is provided between the front cover 21 and the flange portion 63 of the valve cover 61. The O-ring 98 is oil-tightly sealed between the space 92 and the external space, and corresponds to a “seal member” described in the claims.
An O-ring 99 is provided between the cylinder portion of the front cover 21 and the rear cover 25. The O-ring 99 seals between the advance chamber 23 and the retard chamber 24 and the outer space in an oil-tight manner.

[effect]
As described above, in the first embodiment, the valve timing adjusting device 10 includes the valve cover assembly 60. The valve cover assembly 60 includes a valve cover 61, a diaphragm 71, a shaft 75, and a bushing 82. The valve cover 61 is fixed to the front cover 21 and has an opening 67 on the extension of the shaft center 55 of the spool 48. The diaphragm 71 closes the opening 67 of the valve cover 61. The shaft 75 is provided coaxially with the spool 48, fixes the inner peripheral portion 72 of the diaphragm 71, and can press the spool 48 in the axial direction. The bushing 82 is fixed to the valve cover 61 while sandwiching the outer peripheral portion 73 of the diaphragm 71 between the valve cover 61 and allows the shaft 75 to slide in the axial direction while maintaining the coaxiality of the shaft 75 and the spool 48. I support it.

  By configuring the shaft 75 to be aligned by the bushing 82 in this manner, the shaft 75 can be prevented from being displaced in the radial direction with respect to the spool 48. Therefore, it is possible to avoid a decrease in the positional accuracy of the spool 48 in the axial direction due to the shaft 75 being inclined with respect to the spool 48 or the shaft 75 being eccentric with respect to the spool 48.

  Here, considering that the valve timing adjusting device 10 rotates with respect to the fixed position solenoid 208 and that there is hydraulic oil in the vicinity of the contact point between the spool 48 and the shaft 75, the shaft 75 has the bushing 82. If the valve cover 61 is rotatable with respect to the valve cover 61, the inner peripheral portion 72 of the diaphragm 71 may rotate with respect to the outer peripheral portion 73. Therefore, when the solenoid 208 presses the spool 48 in the axial direction via the shaft 75, the inner peripheral portion 72 of the diaphragm 71 may rotate with respect to the outer peripheral portion 73, and the diaphragm 71 may be twisted. If the twist applied to the diaphragm 71 is large, the thin film portion 74 of the diaphragm 71 may be broken.

  On the other hand, in the first embodiment, a flat surface 86 of the shaft 75 and a flat surface 87 of the bushing 82 are formed as rotation preventing means for restricting relative rotation between the shaft 75 and the bushing 82. Therefore, the breakage of the diaphragm 71 can be avoided.

In the first embodiment, the valve cover 61 is fastened to the front cover 21 by bolts 66. The front cover 21 has a convex portion 38 that protrudes in the axial direction between the opening 67 of the valve cover 61 and a fixed portion by the bolt 66 in the radial direction. The valve cover 61 has a large-diameter cylindrical portion 62 that is fitted to the convex portion 38.
With this configuration, it is possible to suppress the deformation of the valve cover 61 when the bolt is tightened from being transmitted to the diaphragm 71. Further, the valve cover assembly 60 and the phase adjustment mechanism 20 can be aligned by fitting the valve cover 61 and the front cover 21 together.

In the first embodiment, a drain oil passage 93 that communicates with the space 92 between the front cover 21 and the valve cover 61 and communicates with the lubrication space 210 of the internal combustion engine 200 is provided.
Therefore, the pressure load on the diaphragm 71 due to the hydraulic oil in the space 91 communicating with the space 92 can be reduced. In addition, it is possible to prevent the pressure from acting on the solenoid 208 side from acting on the diaphragm 71 as a resistance against the pressing force of the solenoid 208.

In the first embodiment, an O-ring 98 is provided between the front cover 21 and the valve cover 61 to seal the space 92 in an oil-tight manner with respect to the external space where the timing pulley 27 is exposed.
Therefore, it is possible to prevent the hydraulic oil in the space 92 from leaking into the external space and being applied to the timing pulley 27.

Second Embodiment
A valve timing adjusting apparatus according to a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the valve cover 100 forms an annular protrusion 101 that protrudes radially inward from the small diameter cylindrical portion 65. The annular protrusion 101 functions as a stopper that restricts the movement of the shaft 75 to the side opposite to the spool 48.
With this configuration, the stroke of the shaft 75 can be regulated so that the deformation of the diaphragm 71 does not exceed the allowable range.

<Third Embodiment>
A valve timing adjusting apparatus according to a third embodiment of the present invention will be described with reference to FIG.
In the third embodiment, the shaft 110 is made of a single member and has a bottomed insertion hole 113 into which the protrusion 112 of the spool 111 is inserted. The bottom surface of the insertion hole 113 is in contact with the protrusion 112. The shaft 110 has an annular groove 114 at the end opposite to the spool 111. An inner peripheral part 116 of the diaphragm 115 is fitted in the annular groove 114.

The inner peripheral portion 116 and the outer peripheral portion 117 of the diaphragm 115 have substantially the same thickness as the thin film portion 74. The inner peripheral portion 116 seals between the space 91 and the external space in an oil-tight manner by a pressing force to the bottom surface of the annular groove 114. A seal member 118 is provided between the outer peripheral portion 117 and the clamping portion 79 of the bushing 82. The seal member 118 oil-tightly seals between the space 91 and the external space.
Thus, the shaft 110 can also be comprised from one member.

<Fourth embodiment>
A valve timing adjusting apparatus according to a fourth embodiment of the present invention will be described with reference to FIG.
In the fourth embodiment, the shaft 120 forms a key 121 protruding outward in the radial direction at the end on the spool 111 side. The bushing 122 has an engagement groove 123 in which the key 121 is fitted. The shaft 120 is prevented from rotating when the key 121 is engaged with the engagement groove 123. The key 121 and the engagement groove 123 constitute a detent means for restricting relative rotation between the shaft 120 and the bushing 122.
In this way, the key 121 and the engagement groove 123 can constitute a detent means.

<Fifth Embodiment>
A valve timing adjusting apparatus according to a fifth embodiment of the present invention will be described with reference to FIG.
In the fifth embodiment, the bushing 130 forms an annular protrusion 131 that protrudes radially inward on the spool 111 side with respect to the shaft 120. The annular protrusion 131 functions as a stopper that restricts the movement of the shaft 120 toward the spool 111.
With this configuration, the stroke of the shaft 120 can be regulated so that the deformation of the diaphragm 115 does not exceed the allowable range.

<Sixth Embodiment>
FIG. 10 shows a valve timing adjusting device according to a sixth embodiment of the present invention. As in the sixth embodiment, both the annular protrusion 101 of the valve cover 100 and the annular protrusion 131 of the bushing 130 may be provided.

<Other embodiments>
In another embodiment of the present invention, the bushing is not limited to press-fitting, and may be fixed to the valve cover with, for example, a screw.
In another embodiment of the present invention, the second shaft is not limited to press-fitting, and may be fixed to the valve cover with, for example, a screw.
In another embodiment of the present invention, there is no need to provide a detent means for restricting relative rotation between the shaft and the bushing.

In the above-described embodiment, the concave portion of the valve cover (the inner wall of the large-diameter cylindrical portion) is configured to fit into the convex portion of the front cover. On the other hand, in another embodiment of the present invention, the concave portion of the front cover may be configured to fit into the convex portion of the valve cover. Moreover, the fitting structure of the above-mentioned recessed part and convex part does not need to be provided.
In another embodiment of the present invention, the timing pulley may be composed of the same member as that constituting the housing.

In the above-described embodiment, the housing is constituted by two members, that is, the front cover and the rear cover. On the other hand, in other embodiment of this invention, a housing may be comprised from three or more members. Further, the rear cover may be formed in a cup shape, and the front cover may be formed in a disk shape.
In the above-described embodiment, the crankshaft (drive shaft) corresponds to the “first shaft” recited in the claims, and the camshaft (driven shaft) is the “second shaft” recited in the claims. Corresponded to the "axis". On the other hand, in another embodiment of the present invention, the crankshaft (drive shaft) corresponds to the “second shaft” recited in the claims, and the camshaft (driven shaft) It may correspond to the “first axis” described in the range.
In another embodiment of the present invention, the valve timing adjusting device may adjust the valve timing of the exhaust valve of the internal combustion engine.
The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

10 .... Valve timing adjusting device 21, 25 ... Housing 27 ...... Timing pulley 32 ... Vane rotor 44 ...... Sleeve 48, 111 ... Spool 55 ··· Shaft 61, 100 ··· Valve cover 67 ··· Opening 71, 115 · · Diaphragm 72, 116 · · Inner circumference 73, 117 · · Outer circumference 75, 110, 120 ... Shafts 82, 122, 130 ... Bushings

Claims (5)

A valve timing adjusting device that is provided in a driving force transmission system for transmitting a driving force from a driving shaft (201) to a driven shaft (202) of the internal combustion engine (200) and adjusts a valve timing of a valve that is driven to open and close by the driven shaft. (10)
When one of the drive shaft and the driven shaft is a first axis and the other is a second axis,
A timing pulley (27) rotatable integrally with the first shaft;
A housing (21, 25) provided integrally with the timing pulley;
A vane rotor (32) fixed to the end of the second shaft in the housing and forming a vane (34) that partitions the internal space of the housing into an advance chamber (23) and a retard chamber (24) When,
A cylindrical member provided at the center of the vane rotor, a supply port (45) communicating with an external oil supply source (206), and an advance port (46) communicating with the advance chamber And a sleeve (44) having a retard port (47) in communication with the retard chamber;
Provided coaxially with the second shaft, is movable in the axial direction inside the sleeve, and switches the communication between the supply port and the advance port according to the position in the axial direction and shuts off the supply port; Spools (48, 111) for switching between communication and blocking with the retard port;
A valve cover (61, 100) provided on the opposite side of the second shaft relative to the housing, fixed to the housing, and having an opening (67) on an extension of the shaft center (55) of the spool;
An annular diaphragm (71, 115) closing the opening;
A shaft (75, 110, 120) provided coaxially with the spool, fixing the inner periphery (72, 116) of the diaphragm, and capable of pressing the spool in the axial direction;
The outer periphery (73, 117) of the diaphragm is fixed to the valve cover while being sandwiched between the valve cover, and the shaft is supported to be slidable in the axial direction while maintaining the coaxiality of the shaft and the spool. Bushings (82, 122, 130)
A valve timing adjusting device comprising:   The valve timing adjusting device according to claim 1, further comprising a detent means (86, 87, 121, 123) for restricting relative rotation between the shaft and the bushing. The valve cover is fastened to the housing by a bolt (66),
One of the housing and the valve cover has a convex portion (38) protruding in the axial direction between the opening of the valve cover and the fixing portion by the bolt in the radial direction,
3. The valve timing adjusting device according to claim 1, wherein the other of the housing and the valve cover has a concave portion (62) fitted into the convex portion.   4. A drain oil passage (93) communicating with a space (92) between the housing and the valve cover and capable of communicating with an external lubricating space (210). The valve timing adjusting device according to any one of the above.   The sealing member (98) which further seals the space between the housing and the valve cover in an oil-tight manner with respect to the external space from which the timing pulley is exposed. The valve timing adjusting device according to claim 1.

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