WO2020054242A1

WO2020054242A1 - Valve timing control device for internal combustion engine, and method for manufacturing same

Info

Publication number: WO2020054242A1
Application number: PCT/JP2019/030151
Authority: WO
Inventors: 徹四宮
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2018-09-10
Filing date: 2019-08-01
Publication date: 2020-03-19
Also published as: JP2022003225A

Abstract

This valve timing control device is provided with: a large-diameter annular groove (43) formed in an axial end surface of the cylindrical section (41) of a housing body (4) so as to face a front plate (not shown), which is a plate member; a first small-diameter annular groove (S12) formed in an axial end surface of a first shoe (S1) so as to face the front plate (not shown) and surrounding a first shoe hole section (S11); a large-diameter annular seal ring (90) disposed in the large-diameter annular groove (43) and airtightly sealing between the large-diameter annular groove (43) and the front plate (not shown); and a first small-diameter annular seal ring (91) disposed in the first small-diameter annular groove (S12) and airtightly sealing between the first small-diameter annular groove (S12) and the front plate (not shown). As a result of this configuration, the large-diameter annular seal ring (90) and the first small-diameter annular seal ring (91) can be prevented from being incorrectly mounted.

Description

Valve timing control device for internal combustion engine and method of manufacturing the same

The present invention relates to a valve timing control device for an internal combustion engine and a method for manufacturing the same.

As a conventional valve timing control device, for example, a device described in Patent Literature 1 below is known.

バルブ In this valve timing control device, a seal ring for hermetically sealing the control chamber is disposed between the housing body and each plate member. This seal ring is formed in an irregular shape so as to avoid a shoe hole portion provided in each shoe inward, and is fitted in an annular groove formed along a peripheral portion of the control chamber on an axial end surface of the housing body. By doing so, they are positioned and arranged.

U.S. Pat. No. 6,948,467

In recent years, shoe holes are arranged at regular intervals in the circumferential direction to regulate the circumferential position of each plate member with respect to the housing body so that the circumferential position of each plate member with respect to the housing body is not mistakenly assembled. Some are not. In this case, while erroneous assembly of each plate member can be suppressed, the seal ring has flexibility, and thus there is a possibility that the seal ring may be assembled in an incorrect position in the circumferential direction.

The present invention has been devised in view of the actual situation of the conventional valve timing control device, and provides a valve timing control device for an internal combustion engine capable of suppressing erroneous assembly of a seal ring, and a method of manufacturing the same. It is intended to be.

According to one aspect of the present invention, there is provided an annular large-diameter annular groove formed on an axial end surface of a cylindrical portion of a housing body so as to face a plate member, and the plate formed on the axial end surface of a first shoe. An annular first small-diameter annular groove surrounding the first shoe hole and formed in the large-diameter annular groove, and hermetically sealing between the large-diameter annular groove and the plate member; And a first small-diameter annular seal ring disposed in the first small-diameter annular groove and hermetically sealing between the first small-diameter annular groove and the plate member.

Further, as one mode of a method of manufacturing the valve timing control device for an internal combustion engine, a sintering step of forming a housing body by sintering, and a resin impregnation step of impregnating the housing body with a resin after the sintering step After the resin impregnating step, a washing step of washing the resin adhered to the surface of the housing body, and after the washing step, an end face in the axial direction facing the plate member in the cylindrical portion of the housing body. After the washing step, a large-diameter annular groove forming step of forming an annular large-diameter annular groove in which the large-diameter annular seal ring is fitted, and a first shoe having an axial end face facing the plate member, A first small-diameter annular groove forming step of forming an annular first small-diameter annular groove into which a first small-diameter annular seal ring surrounding one shoe hole is fitted. It is preferred.

According to the present invention, erroneous assembly of the seal ring can be suppressed.

1 is an exploded perspective view of a valve timing control device for an internal combustion engine according to the present invention. FIG. 2 is a longitudinal sectional view of the valve timing control device shown in FIG. 1. FIG. 3 is a view as viewed from a direction A in FIG. 2 with a front plate removed, showing a most retarded state. FIG. 3 is a view in the direction of arrow A in FIG. 2 with a front plate removed, showing a most advanced state. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 4 is a longitudinal sectional view of a first shoe showing a large-diameter annular groove forming step and a first small-diameter annular groove forming step.

Hereinafter, an embodiment of a valve timing control device for an internal combustion engine according to the present invention will be described with reference to the drawings. In the following embodiment, the device is applied to the intake-side valve timing control device as in the related art. However, the device can be naturally applied to the exhaust-side valve timing control device. is there.

(Configuration of valve timing control device)
Hereinafter, a configuration of a valve timing control device for an internal combustion engine according to the present invention will be described with reference to FIGS. In the description of the present embodiment, the left side of FIG. 2 is described as “front” and the right side is “rear” for convenience. Further, the direction along the rotation axis Z of the camshaft in FIG. 2 will be described as “axial direction”, the direction orthogonal to the rotation axis Z as “radial direction”, and the direction around the rotation axis Z as “circumferential direction”.

FIG. 1 is an exploded perspective view of a valve timing control device for an internal combustion engine according to the present invention. FIG. 2 is a vertical cross-sectional view of the valve timing control device shown in FIG. 1 cut along a rotation axis of a camshaft, to which a hydraulic circuit is added.

As shown in FIGS. 1 and 2, the valve timing control device includes a pulley 42 that is rotationally driven by the rotational force of a crankshaft (not shown) and a camshaft 1 that is provided to be rotatable relative to the pulley 42. It is provided between them. The valve timing control device converts the relative rotational phase between the crankshaft rotating in synchronization with the pulley 42 and the camshaft 1 by operation control through a hydraulic supply / discharge unit 8 described later.

Specifically, the valve timing control device is formed integrally with the pulley 42 and has a housing 2 having a plurality of shoes (first to fourth shoes S1 to S4) protruding inwardly. A vane rotor 3 housed on the peripheral side so as to be relatively rotatable and having a plurality of vanes (first to fourth vanes V1 to V4) protruding toward the outer peripheral side.

The camshaft 1 is rotatably supported by a bearing provided on a cylinder head (not shown), and opens an intake valve (not shown) via a drive cam (not shown). At the front end of the camshaft 1, a rotor connecting portion 11 is provided facing the inner peripheral side of a rear end of a rotor body 31, which will be described later, and is used for connection with the vane rotor 3. Inside the rotor connection portion 11, a female screw portion 12 into which a cam bolt 10 for fastening the vane rotor 3 is screwed is formed along the axial direction.

The housing 2 includes a cylindrical housing body 4 having both ends opened in the axial direction, a front plate 5 serving as a first plate member for closing an opening on the front end side of the housing body 4, and a rear end of the housing body 4. And a rear plate 6 that is a second plate member that closes the opening on the side. The housing body 4, the front plate 5, and the rear plate 6 are fixed together by a plurality of bolts (first to fourth bolts B1 to B4).

In the present embodiment, the housing 2 has an example in which the front and rear sides of the housing body 4 are open. However, the housing body 4 only needs to open at least one of the front and rear sides. It is not limited to a mode in which both sides are opened. In other words, the housing 2 may have a configuration in which, for example, the housing body 4 is formed in a bottomed cylindrical shape and has only one of the front plate 5 and the rear plate 6.

The housing body 4 is integrally formed of a sintered metal material impregnated with a predetermined resin material (thermosetting resin or anaerobic curing resin). That is, the housing body 4 includes a cylindrical tubular portion 41 that opens at both ends in the axial direction, first to fourth shoes S1 to S4 that protrude toward the inner peripheral side of the tubular portion 41, and a cylindrical portion. A pulley 42 having a plurality of teeth protruding to the outer peripheral side of 41 is integrally formed. A timing belt (not shown) is wound around the pulley 42, and is linked with the crankshaft (not shown) via the timing belt, and rotates in synchronization with the crankshaft. The timing belt is a dry belt that does not like lubricating oil to adhere.

The cylindrical portion 41 has a cylindrical shape with a constant axial width, and is formed integrally with the inner peripheral side of the pulley 42. Here, the axial width of the cylindrical portion 41 is set smaller than the axial width of the pulley 42, and both ends in the axial direction are formed in a stepped concave shape with respect to the axial end surface of the pulley 42. Specifically, the front end side of the cylindrical portion 41 is formed to be slightly larger (deep) than the thickness of the outer peripheral side of the front plate 5, and the rear end side of the cylindrical portion 41 is formed on the outer peripheral side of the rear plate 6. The recess is formed slightly smaller (shallower) than the thickness.

A large-diameter annular groove 43 having a circular shape in a plan view is continuously formed in the axial end face of the cylindrical portion 41 facing the front plate 5 or the rear plate 6 as a plate member along the circumferential direction. Is formed. The large-diameter annular groove 43 has a substantially rectangular uniform cross section in the entire circumferential direction. The large-diameter annular groove 43 has an endless airtight seal between the front plate 5 and the rear plate 6. An annular large-diameter annular seal ring 90 is attached. The large-diameter annular seal ring 90 is a known O-ring formed of a rubber material into a ring shape having a substantially circular cross section. The large-diameter annular seal ring 90 has a wire diameter larger than the depth of the large-diameter annular groove 43, and projects outward from the axial end face of the tubular portion 41 in the attached state, and It comes into elastic contact with the plate 6.

The first to fourth shoes S1 to S4 have a substantially trapezoidal shape in plan view, and each of the first to fourth shoes S1 to S4 has a substantially rectangular cross-sectional seal opening inward in the radial direction. A groove is formed along the axial direction, and a seal member 40 formed in a substantially prismatic shape is attached to the seal groove. In other words, the space defined between the first to fourth shoes S1 to S4 and the first to fourth vanes V1 to V4 is formed by the respective seal members 40 slidingly contacting the outer peripheral surface of the rotor body 31 described later. It is airtightly partitioned as a retard chamber Re or an advance chamber Ad described later.

Also, the first to fourth shoe holes S11, S21, through which the shaft portions of the first to fourth bolts B1 to B4 pass are provided inside the base portions (outer peripheral sides) of the first to fourth shoes S1 to S4. S31 and S41 are formed to penetrate along the axial direction. On the outer peripheral side of the first to fourth shoe holes S11, S21, S31, S41, there is formed a circular ring in plan view that surrounds the first to fourth shoe holes S11, S21, S31, S41. The first to fourth small-diameter annular grooves S12, S22, S32, S42 to be formed are formed continuously along the circumferential direction. The first to fourth small-diameter annular grooves S12, S22, S32, and S42 have the same configuration, have a substantially rectangular uniform cross section throughout the circumferential direction, and have the first to fourth small-diameter annular grooves. At S12, S22, S32, and S42, endless annular first to fourth small-diameter annular seal rings 91 to 94 for hermetically sealing the space between the front plate 5 and the rear plate 6 are attached. The first to fourth small-diameter annular seal rings 91 to 94 are well-known O-rings formed in a ring shape having a substantially circular cross section by a rubber material. Each of the first to fourth small-diameter annular seal rings 91 to 94 has a wire diameter larger than the depth of the first to fourth small-diameter annular grooves S12, S22, S32, and S42. Protrudes outward from the axial end surface of the front plate 5 and elastically contacts the front plate 5 or the rear plate 6.

The front plate 5 is integrally formed of a predetermined metal material, and has a front plate portion 51 formed in a disk shape extending in a radial direction, and a substantially cylindrical shape extending from the center of the front plate portion 51 forward. And a front boss portion 52 projecting in a shape. A cam bolt hole 53 through which the head of the cam bolt 10 passes is formed through the center of the front boss 52. The cam bolt hole 53 has an inner diameter slightly larger than the outer diameter of the washer 13 on which the head of the cam bolt 10 is seated, and receives the head of the cam bolt 10 and the washer 13 arranged between the vane rotor 3. In the region on the outer peripheral side of the front plate portion 51, the shaft portions of the first to fourth bolts B1 to B4 pass at predetermined positions corresponding to the first to fourth shoe holes S11, S21, S31, S41. First to fourth plate holes 511 to 514 corresponding to the plate holes are formed through.

開口 The opening of the front boss 52 is sealed by the plug 54. An annular seal ring 55, which is a well-known O-ring, is arranged between the plug 54 and the front boss portion 52. As described above, by attaching the plug 54 to the opening of the front boss 52, the inside of the front boss 52 is kept airtight by the plug 54. In other words, the opening of the front boss portion 52 is sealed by the plug 54 with the seal ring 55 interposed therebetween, so that the hydraulic oil leaked from the hydraulic supply / discharge means 8 described below is prevented from flowing out to the outside. I have.

The rear plate 6 is integrally formed of a predetermined metal material, and has a rear plate portion 61 formed in a disk shape extending in a radial direction, and a substantially cylindrical shape extending rearward from a central portion of the rear plate portion 61. And a rear boss portion 62 projecting in a shape. A camshaft hole 63 through which the camshaft 1 passes is formed through the center of the rear boss portion 62. The camshaft hole 63 has an inner diameter substantially equal to the outer diameter of the camshaft 1 and receives the camshaft 1 in a penetrating state.

The outer peripheral area of the rear plate portion 61 corresponds to a plate hole through which the first to fourth bolts B1 to B4 pass at predetermined positions corresponding to the first to fourth shoe holes S11, S21, S31, S41. Further, first to fourth female screw holes 611 to 614 are formed through which the male screw portions of the first to fourth bolts B1 to B4 are engaged. Further, a lock hole 64 is formed between the first female screw hole 611 and the second female screw hole 612 so that a tip of a lock pin 71 described later can be engaged with the lock hole 64. The inner diameter of the lock hole 64 is set to be substantially the same as the outer diameter of the distal end of the lock pin 71, and can be engaged with the distal end of the lock pin 71 without excess or shortage.

Further, at an inner end face (front end face) of the rear plate portion 61 and at a circumferential position corresponding to the later-described advance chamber Ad, a advance that communicates the later-described advance-side annular groove 822 with the advance chamber Ad is provided. The corner side oil groove 65 is provided along the radial direction. That is, by connecting the advance angle chamber Ad and the advance angle annular groove 822 described later via the advance angle oil groove 65, the hydraulic oil supply / discharge means 8 can supply and discharge the hydraulic oil to the advance angle chamber Ad. It has become.

The vane rotor 3 is integrally formed of a predetermined metal material, and has a substantially cylindrical rotor body 31 at a central portion and a plurality of vanes (first vanes radially protruding to the outer peripheral side of the rotor body 31). First to fourth vanes V1 to V4). The vane rotor 3 is attached to the tip end (the rotor connection portion 11) of the camshaft 1 via the rotor body 31, and is fixed to the camshaft 1 via the cam bolt 10.

The rotor body 31 has a substantially cylindrical shape with a bottom that opens rearward, and closes a cylindrical portion 32 that is used for supply and discharge of hydraulic oil by the hydraulic supply / discharge unit 8 and a front end side of the cylindrical portion 32. And an end wall 33 for fastening the vane rotor 3 by the cam bolts 10 are integrally formed.

The cylindrical portion 32 is provided at a position on both sides in the circumferential direction with the first to fourth vanes V1 to V4 interposed therebetween, and at a circumferential position corresponding to the later-described retard chamber Re, a later-described retard-side annular groove. The retard side oil hole 34 that communicates the 812 with the retard chamber Re is provided along the radial direction. That is, by connecting the retard chamber Re and the retard annular groove 812 to be described later via the retard oil hole 34, the hydraulic oil supply / discharge means 8 can supply and discharge the hydraulic oil to the retard chamber Re. It has become.

A bolt through hole 35 through which the shaft of the cam bolt 10 passes is formed substantially in the center of the end wall 33 along the axial direction. That is, the head of the cam bolt 10 passing through the bolt through hole 35 is seated on the front end face of the end wall 33 via the washer 13, so that the vane rotor 3 is fastened to the end of the camshaft 1. The inner end surface (rear end surface) of the end wall 33 is engaged with a positioning pin 14 projecting from the end surface of the rotor connection portion 11 of the camshaft 1 at a predetermined position in the circumferential direction on the outer peripheral side of the bolt through hole 35. A possible pin engagement hole 36 is provided. That is, the positioning pin 14 projecting from the end face of the rotor connection portion 11 is engaged with the pin engagement hole 36, so that the vane rotor 3 can be positioned in the circumferential direction with respect to the camshaft 1.

The first to fourth vanes V1 to V4 have a substantially trapezoidal shape in plan view, and are respectively arranged between the first to fourth shoes S1 to S4 in the circumferential direction. Further, similarly to the first to fourth shoes S1 to S4, a substantially rectangular seal groove having a transverse cross section that opens outward in the radial direction is provided at each end of the first to fourth vanes V1 to V4. A seal member 30 formed in a substantially prismatic shape is attached to the seal groove. That is, the space defined between the first to fourth shoes S1 to S4 in the circumferential direction is formed by the first to fourth vanes V1 to V4 when each seal member 30 slides on the inner peripheral surface of the housing body 4. , Are each airtightly partitioned as a retard chamber Re or an advance chamber Ad described later.

のみ In addition, only the first vane V1 of the first to fourth vanes V1 to V4 is configured as a specific vane having a larger circumferential width than the other second to fourth vanes V2 to V4. A well-known lock mechanism 7 that holds the relative rotation phase of the vane rotor 3 with respect to the housing 2 when the engine is stopped is housed inside the first vane V1.

The lock mechanism 7 is housed in the first vane V <b> 1 and is a lock pin 71 which is a lock member provided so as to be engageable with the lock hole 64 of the rear plate 6, and biases the lock pin 71 toward the rear plate 6. A spring 72 as an urging member. The lock pin 71 is slidably accommodated in the pin accommodation hole 37 that passes through the inside of the first vane V1 in the axial direction, and engages with the lock hole 64 by advancing toward the rear plate 6 side. The spring 72 is pre-compressed between the front plate 5 and the lock pin 71, and urges the lock pin 71 toward the rear plate 6 by an urging force based on the pre-compression.

With such a configuration, when the circumferential positions of the lock hole 64 and the lock pin 71 match, the lock mechanism 7 pushes the tip of the lock pin 71 urged by the spring 72 into the lock hole 64, The lock state is established in which the relative rotation between the housing 2 and the vane rotor 3 is restricted.

A communication groove (not shown) is provided on the rear end surface of the first vane V <b> 1 (the end surface facing the rear plate 6) to communicate the later-described retard chamber Re and the lock hole 64. That is, when a hydraulic pressure acts on the distal end side of the lock pin 71 through the communication groove, the lock pin 71 is pushed away by the hydraulic pressure, and the locked state is released.

The hydraulic supply / discharge means 8 selectively supplies hydraulic oil to one of the control chambers (the retard chamber Re or the advance chamber Ad described later) and the other control chamber (the retard chamber Re or the advance chamber described later). The hydraulic oil is discharged from the corner chamber Ad). Specifically, the hydraulic supply / discharge means 8 includes a retard oil passage 81 connected to the retard oil hole 34, an advance oil passage 82 connected to the advance oil groove 65, and a solenoid valve 83. And a drain passage 85 connected to the

other oil passages

81, 82 via an electromagnetic valve 83.

The retard-side oil passage 81 includes a retard-side connection passage 811 provided along the inner axial direction of the camshaft 1 and a retard-side annular passage provided on the outer peripheral side of the front end of the retard-side connection passage 811. It communicates with the retard side oil hole 34 via the groove 812. Similarly, the advance-side oil passage 82 includes an advance-side connection passage 821 provided in parallel with the retard-side connection passage 811 along the internal axial direction of the camshaft 1, and a front end of the advance-side connection passage 821. It communicates with the advance-side oil groove 65 via the advance-side annular groove 822 provided on the outer peripheral side of the portion.

The electromagnetic valve 83 is a two-way switching valve, and is connected to each of the

oil passages

81 and 82 by a control signal from an electronic control unit (ECU) (not shown) output based on detection results of various sensors mounted on the vehicle. The connection to the drain 84 and the drain passage 85 is selectively switched.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2 with the front plate 5 removed in the valve timing control device shown in FIG. 2, wherein the vane rotor 3 is positioned at the most retarded angle with respect to the housing 2. FIG. FIG. 4 is a view similar to FIG. 3 and shows the valve timing control device shown in FIG. 2 with the front plate 5 removed, as viewed from the direction A in FIG. This shows a state where the vane rotor 3 is located at the most advanced angle. 3 and 4, only the front end side (front plate 5 side) of the cylindrical portion 41 will be described, but the same applies to the rear end side (rear plate 6 side) (see FIGS. 1 and 2). ).

As shown in FIGS. 3 and 4, the housing body 4 has a cylindrical tubular portion 41 that opens at both ends in the axial direction, and first to fourth shoes that protrude toward the inner peripheral side of the tubular portion 41. S1 to S4 and a pulley 42 including a plurality of teeth projecting to the outer peripheral side of the cylindrical portion 41 are integrally formed. The first to fourth shoes S1 to S4 have a substantially trapezoidal shape in plan view, and have first to fourth shoe holes S11, S21, S31, and S41 formed on the base portions that are wide. Further, a seal groove that opens radially inward is formed at the tip of the first to fourth shoes S1 to S4, and a prismatic seal member 40 is disposed in the seal groove.

Further, a large-diameter annular groove 43 having a circular shape in a plan view is continuously formed in the axial end face of the cylindrical portion 41 facing the front plate 5 (or the rear plate 6) as a plate member along the circumferential direction. It is formed. The large-diameter annular groove 43 has a uniform cross section formed in a substantially rectangular shape. The large-diameter annular groove 43 has an endless airtight seal with the front plate 5 (or the rear plate 6). A large-diameter annular seal ring 90 formed in an annular shape is arranged. The large-diameter annular seal ring 90 is a known O-ring formed of a rubber material in a ring shape.

In the present embodiment, the first to fourth shoe holes S11, S21, S31, and S41 are surrounded on the outer peripheral side of the first to fourth shoe holes S11, S21, S31, and S41. First to fourth small-diameter annular grooves S12, S22, S32, S42 forming a circular annular shape are formed continuously along the circumferential direction. The first to fourth small-diameter annular grooves S12, S22, S32, and S42 have the same configuration, have a uniform cross section formed in a substantially rectangular shape, and have the first to fourth small-diameter annular grooves S12. , S22, S32, S42 are provided with first to fourth small-diameter annular seal rings 91 to 94 formed in an endless annular shape for hermetically sealing the space between the front plate 5 (or the rear plate 6). I have. The first to fourth small-diameter annular seal rings 91 to 94 are well-known O-rings formed of a rubber material in a ring shape.

The vane rotor 3 is compared with first to fourth vanes V1 to V4, which are four vanes radially protruding, on the outer peripheral side of a substantially cylindrical rotor body 31, that is, a relatively wide first vane V1. The second to fourth vanes V2 to V4 having a narrow target width are integrally formed. Each of the first to fourth vanes V1 to V4 is formed in a substantially trapezoidal shape in plan view in which the circumferential width on the distal end side is wide and the circumferential width on the base end side is narrow. In addition, a seal groove that opens outward in the radial direction is formed at the tip of each of the first to fourth vanes V1 to V4, and a prismatic seal member 30 is disposed in the seal groove.

As described above, the seal members 40 provided on the first to fourth shoes S1 to S4 elastically contact the outer peripheral surface of the rotor body 31, and the seal members provided on the first to fourth vanes V1 to V4. The member 30 elastically contacts the inner peripheral surface of the housing body 4 (the cylindrical portion 41). As a result, a space between the shoes S1 to S4 in the circumferential direction is abbreviated as a retard working chamber (hereinafter abbreviated as “retard chamber”) Re and an advance working chamber (hereinafter abbreviated as “advance chamber”). ) And Ad. Then, by selectively supplying hydraulic oil to the retard chamber Re or the advance chamber Ad from the hydraulic supply / discharge means 8, the operation of the valve timing control device is controlled.

Further, the cylindrical portion 32 of the rotor body 31 is provided at the circumferential position adjacent to the base of the first to fourth vanes V1 to V4 on the side of the retard chamber Re on the retard side oil communicating with the retard chamber Re. The hole 34 is formed to penetrate along the radial direction. As a result, the working oil is supplied to and discharged from each of the retard chambers Re through the respective retard side oil holes 34.

The inner end face (front end face) of the rear plate 6 is located at a circumferential position adjacent to the leading end of the first to fourth shoes S1 to S4 on the side of the advance chamber Ad. The corner side oil groove 65 is formed along the radial direction. As a result, the working oil is supplied to and discharged from each advance chamber Ad via each advance oil groove 65.

FIG. 5 is an enlarged view of a main part of FIG. FIG. 6 is an enlarged view of a main part of FIG. Here, the first to fourth small-diameter annular grooves S12, S22, S32 and S42 provided in the first to fourth shoes S1 to S4 have the same form as described above. For this reason, in this embodiment, only the first small-diameter annular groove S12 will be described for convenience, and detailed descriptions of the second to fourth small-diameter annular grooves S22, S32, and S42 will be omitted.

As shown in FIGS. 5 and 6, a large-diameter annular groove 43 having a circular shape in a plan view is formed on the axial end surface of the cylindrical portion 41 facing the front plate 5 to the rear plate 6 along the circumferential direction. And are formed continuously. The large-diameter annular groove 43 has a substantially rectangular uniform cross section in the entire circumferential direction, and is formed by machining after the housing body 4 formed by sintering is impregnated with resin. And a side surface having a cut surface formed by the machining.

{Circle around (2)} An endless annular large-diameter annular seal ring 90 for hermetically sealing the space between the front plate 5 and the rear plate 6 is fitted into the large-diameter annular groove 43. The large-diameter annular seal ring 90 is a well-known O-ring made of a rubber material and formed in a ring shape having a substantially circular cross section. The large-diameter annular seal ring 90 has a wire diameter larger than the depth of the large-diameter annular groove 43, and projects outward from the axial end face of the cylindrical portion 41 in the assembled state, and It is in elastic contact with the rear plate 6.

Further, the wire diameter of the large-diameter annular seal ring 90 is set to be larger than the wire diameter of the first small-diameter annular seal ring 91, and the large-diameter annular seal ring 90 is relatively larger than the first small-diameter annular seal ring 91. The front plate 5 is brought into contact with the front plate 5 in a state of being largely elastically deformed. As a result, as shown by a broken line in FIG. 6, the outer peripheral edge of the front plate 5 is deformed by the tightening of the first bolt B1 during assembly of the valve timing control device so as to be separated from the axial end surface of the cylindrical portion 41. Even in this case, it is possible to make contact with the front plate 5 following the deformation of the front plate 5. The “wire diameter” means the diameter of the circular cross section of the large-diameter annular seal ring 90 and the first small-diameter annular seal ring 91 in a free state.

The outer diameter of the large-diameter annular seal ring 90 is set slightly larger than the outer diameter of the large-diameter annular groove 43. In other words, the large-diameter annular seal ring 90 has an outer diameter larger than that of the large-diameter annular groove 43, and is attached to the large-diameter annular groove 43 so that the outer peripheral side of the large-diameter annular groove 43. It comes into elastic contact with the side surface.

第 A first shoe hole S11 through which the first bolt B1 passes is formed in the base side (outer peripheral side) of the first shoe S1 along the axial direction. Further, on the outer peripheral side of the first shoe hole S11, a first small-diameter annular groove S12 surrounding the first shoe hole S11 and having a circular shape in plan view is formed continuously along the circumferential direction. Have been. The first small-diameter annular groove S12 has a substantially rectangular uniform cross section in the entire circumferential direction, and is formed by machining after the housing body 4 formed by sintering is impregnated with resin. The bottom surface and the side surface have a cut surface formed by the machining. In addition, the first small-diameter annular groove S12 is provided at a position radially separated from the large-diameter annular groove 43, and is configured not to directly communicate with the large-diameter annular groove 43.

The endless annular first small-diameter annular seal ring 91 for hermetically sealing the space between the front plate 5 and the rear plate 6 is fitted into the first small-diameter annular groove S12. Like the large-diameter annular seal ring 90, the first small-diameter annular seal ring 91 is a well-known O-ring formed of a rubber material and formed in a ring shape having a substantially circular cross section. The first small-diameter annular seal ring 91 has a wire diameter larger than the depth of the large-diameter annular groove 43, and in the assembled state, protrudes outward from the axial end face of the tubular portion 41, and Or elastically contact the rear plate 6.

Further, since the first small-diameter annular groove S12 and the large-diameter annular groove 43 are spaced apart from each other, the first small-diameter annular seal ring 91 is radially separated from the large-diameter annular seal ring 90. Be placed. Thus, a radially separated portion X is formed between the large-diameter annular seal ring 90 and the first small-diameter annular seal ring 91. The radially separated portion X is provided between the first small-diameter annular seal ring 91 and the large-diameter annular ring in a state where the front plate 5 is attached to the housing body 4 in which the large-diameter annular seal ring 90 and the first small-diameter annular seal ring 91 are arranged. A minute gap C is formed between the seal ring 90 (see FIG. 6).

Further, the wire diameter of the first small-diameter annular seal ring 91 is set smaller than the wire diameter of the large-diameter annular seal ring 90, and the first small-diameter annular seal ring 91 is relatively smaller than the large-diameter annular seal ring 90. And comes into contact with the front plate 5 in an elastically deformed state. Here, since the first small-diameter annular seal ring 91 is disposed adjacent to the first shoe hole S11, the outer peripheral edge of the front plate 5 is tightened by tightening the first bolt B1 accompanying assembly of the valve timing control device. Even when the portion is deformed so as to be separated from the axial end surface of the cylindrical portion 41, the portion is hardly affected by the deformation and can elastically contact the front plate 5.

内径 Further, the inner diameter of the first small-diameter annular seal ring 91 is set slightly smaller than the inner diameter of the first small-diameter annular groove S12. In other words, the first small-diameter annular seal ring 91 has an inner diameter smaller than that of the first small-diameter annular groove S12, and is attached to the first small-diameter annular groove S12. The inner peripheral side surface is elastically contacted.

(Manufacturing method of valve timing control device)
Hereinafter, a method for manufacturing the valve timing control device for an internal combustion engine according to the present invention will be described. In the present embodiment, among the valve timing control devices, a manufacturing process of the housing body 4 according to a characteristic configuration of the present invention will be described.

In manufacturing the valve timing control device of the present invention relating to the manufacture of the housing body 4, first, the housing body 4 is formed by sintering (sintering step). In this sintering step, the outer shape of the housing body 4 is formed, the large-diameter recess 430 (see FIG. 7) serving as the base of the large-diameter annular groove 43, and the first to fourth small-diameter annular grooves S12, S22, S32. , S42 are formed as small-diameter concave portions S120 (see FIG. 7). Subsequently, as shown in FIG. 7A, the pores H formed inside the housing body 4 by the sintering are impregnated with a resin P (thermosetting resin or anaerobic curing resin) (resin impregnation). Process). Thereafter, before the resin P is cured, the resin P attached to the surface of the housing body 4 due to the impregnation is washed (a washing step).

Subsequently, after the housing body 4 is washed and the resin P is cured, a large-diameter annular portion is formed on the outer peripheral edge of the axial end face of the cylindrical portion 41 of the housing body 4 facing the plate member (for example, the front plate 5). The groove 43 is formed by machining (cutting) (large-diameter annular groove forming step). Specifically, the bottom and side surfaces of the large-diameter concave portion 430 formed in the sintering process are cut together with the axial end surface of the cylindrical portion 41 offset inward with respect to the axial end surface of the pulley 42. Thus, a large-diameter annular groove 43 is formed (see FIG. 7B). In this manner, by cutting the large-diameter concave portion 430 to form the large-diameter annular groove 43, the holes H that are not filled with the resin P are removed by cutting, as shown in FIG. In the above description, only the front end side (front plate 5 side) of the cylindrical portion 41 is illustrated, but the same applies to the rear end side (rear plate 6 side).

After the large-diameter annular groove forming step, the outer peripheral surfaces of the first to fourth shoe holes S11, S21, S31, and S41 are axial end surfaces of the cylindrical portion 41 of the housing body 4 facing the front plate 5. On the side, first to fourth small-diameter annular grooves S12, S22, S32, and S42 are formed by machining (cutting) (first to fourth small-diameter annular groove forming steps). Specifically, taking the first small-diameter annular groove S12 as an example, the first small-diameter annular groove S12 is formed by cutting the bottom and side surfaces of the small-diameter concave portion S120 formed in the sintering step. In this manner, by cutting the small-diameter concave portion S120 to form the first small-diameter annular groove S12, the holes H that are not filled with the resin P are removed by cutting, as in the case of the large-diameter annular groove 43. (See FIG. 7B). In the above description, only the first small-diameter annular groove S12 has been described as an example, but the same applies to the second to fourth small-diameter annular grooves S22, S32, and S42.

(5) With the above, the manufacture of the housing body 4 is completed. Note that, in the present embodiment, an example has been described in which, after the cleaning step, the process shifts to the first to fourth small-diameter annular groove forming steps via the large-diameter annular groove forming step. Any of the first to fourth small-diameter annular groove forming steps may be performed first. That is, after the cleaning step, the process may shift to the large-diameter annular groove forming step through the first to fourth small-diameter annular groove forming steps.

(Operation and effect of the present embodiment)
In recent years, by not disposing the first to fourth plate holes 511 to 514 at equal intervals in the circumferential direction, the circumferential position of the front plate 5 or the rear plate 6 with respect to the housing body 4 is regulated. In addition, erroneous assembly of the rear plate 6 is suppressed. However, when the seal ring corresponding to the large-diameter annular seal ring 90 according to the present embodiment is formed in an irregular shape as in the conventional valve timing control device, the circumferential position of the seal ring is erroneously assembled. There is a risk. That is, the flexible seal ring can be fitted into the annular groove in a state where it is flexed and deformed in accordance with the shape of the annular groove, which is the seal groove, even if the circumferential position is incorrect. As a result, when assembling the front plate 5 or the rear plate 6, the seal ring is assembled in a state of being engaged between the housing body 4 and the front plate 5 or the rear plate 6, and the seal ring may be damaged or may be damaged. There was a possibility that the sealing property could not be ensured.

On the other hand, the valve timing control device for an internal combustion engine and the method of manufacturing the same according to the present embodiment can solve the problems of the conventional valve timing control device by providing the following effects. In the following, for convenience, only the front end side (front plate 5 side) of the tubular portion 41 will be described, but the same applies to the rear end side (rear plate 6 side).

The valve timing control device for an internal combustion engine according to the present embodiment changes the relative rotation phase between a crankshaft (not shown) and the camshaft 1 (not shown) of the internal combustion engine, thereby driving an intake valve or an exhaust valve (not shown) driven by the camshaft 1. A valve timing control device for an internal combustion engine for controlling the opening / closing timing of a cylinder, comprising: a tubular portion 41 formed at least in one end in an axial direction along a rotation axis Z of a camshaft 1; Out of a plurality of shoes (first to fourth shoes S1 to S4) protruding inward in the radial direction orthogonal to the rotation axis Z of the camshaft 1 from the plurality of shoes (first to fourth shoes S1 to S4). The first shoe S1 has a housing body 4 having a first shoe hole S11 formed in the axial direction, and a plate-like member for closing one end of the cylindrical portion 41 in the axial direction. A front plate 5 as a plate member having a first plate hole 511 formed in the axial direction, and a rotatable relative to the tubular portion 41 inside the tubular portion 41. A vane rotor fixed to the camshaft 1 and a pair of shoes (first to fourth shoes S1 to S4) protruding outward from the rotor body 31 in the radial direction. A vane rotor 3 having a plurality of vanes (first to fourth vanes V1 to V4) defining a control chamber (retard chamber Re and advance chamber Ad); a first plate hole 511 and a first shoe hole. A first bolt B1 passing through S11, an annular large-diameter annular groove 43 formed on the axial end surface of the cylindrical portion 41 so as to face the front plate 5 as a plate member, and the shaft of the first shoe S1. End face of direction An annular first small-diameter annular groove S12, which is formed to face the front plate 5 and surrounds the first shoe hole S11, is disposed in the large-diameter annular groove 43, and is formed between the large-diameter annular groove 43 and the front plate 5. A large-diameter annular seal ring 90 for hermetically sealing the space between the first small-diameter annular groove S12 and a first small-diameter annular seal ring 91 for hermetically sealing the space between the first small-diameter annular groove S12 and the front plate 5; And

As described above, in the present embodiment, the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 are provided separately. Therefore, even when the first to fourth plate holes 511 to 514 (the first to fourth shoe holes S11, S21, S31, S41) are not arranged at equal intervals, the first to fourth plate holes 511 are formed. It is possible to arrange the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 without being affected by the circumferential positions 514 to 514. Thus, erroneous assembly of the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 can be suppressed.

In addition, in the present embodiment, the cylindrical portion 41 is formed of a sintered metal impregnated with the resin P.

When the pulley 42 is integrally provided on the outer peripheral side of the tubular portion 41, the strength is insufficient if the tubular portion 41 is formed of aluminum die-casting. Therefore, it is necessary to increase the strength by extending the pulley 42 long in the axial direction. This leads to an increase in the size of the housing body 4.

Therefore, in the present embodiment, by forming the tubular portion 41 by sintering, the strength of the tubular portion 41 can be increased as compared with the one made of aluminum die-cast. Accordingly, the strength required for the housing body 4 can be secured without increasing the size of the housing body 4, and the durability of the device can be improved.

When the cylindrical portion 41 is simply formed by sintering, the hydraulic oil in each control chamber (retard chamber Re and advance chamber Ad) flows through holes H formed inside by sintering. There is a risk of leakage to the outside.

Therefore, in the present embodiment, the resin P is impregnated into the holes H formed inside the cylindrical portion 41 by sintering, and the holes H are filled with the resin P, thereby allowing each control chamber (the retard chambers Re and Leakage of hydraulic oil in the advance chamber Ad) can be suppressed.

In the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 are each formed in an annular shape.

When the annular groove for assembling the seal ring is formed in a deformed shape as in the conventional valve timing control device, the seal ring is assembled in a state where the circumferential position of the seal ring does not match the circumferential position of the annular groove. There is a risk that this will result in incorrect assembly.

Therefore, in the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 are formed in an annular shape in plan view, so that the circumferential positions of the seal rings 90 and 91 and the annular grooves 43 and S12 match. It is not necessary, and the occurrence of erroneous assembly of the large-diameter annular seal ring 90 and the first small-diameter annular seal ring 91 can be suppressed.

Furthermore, according to the present embodiment, when a dry belt is used as a power transmission member, it is possible to solve a problem that occurs when an annular groove for assembling a seal ring is formed in a sintered housing body 4 impregnated with a resin P. it can. If the annular groove for assembling the seal ring to the housing body 4 is irregular, as in the conventional case, the housing body 4 is cast by aluminum die casting or the like from which hydraulic oil does not leak, and the annular groove is formed by a mold at the time of the casting. It may be formed. However, when the housing body 4 is formed by sintering for strength or the like, it is necessary to perform a sealing treatment by impregnating the resin P in order to suppress leakage of hydraulic oil. As described above, in the cleaning process after the resin impregnation process, the holes H generated in the process of washing away the resin P excessively adhered to the surface are removed by cutting, but in performing the cutting, a seal ring is assembled. If the annular groove is deformed, it takes too much time for cutting, and the productivity of the valve timing control device may be reduced. On the other hand, when the dry belt is used as the power transmission member as in the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 are formed in an annular shape, thereby shortening the time of the cutting process. It is possible to improve the productivity of the valve timing control device.

In the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 each have a cut surface on the bottom surface or side surface.

(4) In the cleaning step after the resin impregnation step, the resin P filled in the holes H opened in the surface of the housing body 4 may be washed away. As a result, in each of the annular grooves 43 and S12, the inside and outside communicate with each other through the holes H from which the resin P has been washed away, and it may be difficult to ensure the sealing performance by the seal rings 90 and 91. is there. This is because, when a hole H remains in a portion where each

seal ring

90, 91 contacts each annular groove 43, S12, air and hydraulic oil straddle each

seal ring

90, 91 via this hole H. It is because it becomes movable. In this case, the leaked hydraulic oil adheres between the timing belt, which is a dry belt, and the pulley 42, so that slippage easily occurs between the timing belt and the pulley 42. As a result, the phase between the timing belt and the pulley 42 may be shifted.

Therefore, in the present embodiment, the resin P is formed by forming a cut surface on the bottom surface and the side surface of the large-diameter annular groove 43 and the bottom surface and the side surface of the first to fourth small-diameter annular grooves S12, S22, S32, and S42. Can be removed by cutting. Thereby, the problem that the inside and outside communicate with each other through the holes H from which the resin P has been washed away is suppressed, and the sealing properties of the seal rings 90 and 91 can be improved.

Furthermore, in the present embodiment, the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42 are formed in an annular shape in plan view. Cutting can be easily performed as compared with the case where the fourth small-diameter annular grooves S12, S22, S32, S42 are formed in an irregular shape. Thus, the cut surface can be formed while suppressing a decrease in the productivity of the apparatus.

In addition, in the present embodiment, the cylindrical portion 41 has a pulley 42 on the outer peripheral side to which the rotational force from the crankshaft is transmitted.

As described above, in the present embodiment, by forming the pulley 42 integrally on the outer peripheral side of the cylindrical portion 41, the housing body 4 is formed as compared with the case where the cylindrical portion 41 and the pulley 42 are formed separately. Can be reduced in the radial direction, and the size of the apparatus can be reduced.

In the present embodiment, the large-diameter annular seal ring 90 and the first small-diameter annular seal ring 91 are provided apart from each other in the radial direction of the housing body 4.

では In the valve timing control device, the vane rotor 3 flutters due to so-called alternating torque. Then, in the valve timing control device in which each control chamber (retard chamber Re and advance chamber Ad) is kept airtight, the hydraulic oil in each control chamber (retard chamber Re and advance chamber Ad) is pressurized (compressed). ), And may flow backward through the retard side oil hole 34 and the advance side oil groove 65.

Therefore, in the present embodiment, the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 are provided separately from each other, and these large-diameter annular seal ring 90 and the first to fourth small-diameter annular rings are provided. A radially separated portion X is provided between the annular seal rings 91 to 94. Thus, when the vane rotor 3 flaps due to the alternating torque, the advance chamber Ad adjacent to each shoe S1 to S4 is retarded through the gap C formed by the radially separated portion X. Communication with the room Re becomes possible. In other words, when hydraulic oil in each control chamber (retard chamber Re and advance chamber Ad) is pressurized by the fluttering of the vane rotor 3 due to the alternating torque, each control chamber ( Hydraulic oil in the retard chamber Re and the advance chamber Ad) can be released to the adjacent control chambers (the retard chamber Re and the advance chamber Ad) with the shoes S1 to S4 interposed therebetween. As a result, it is possible to reduce the backflow of the hydraulic oil in each control chamber (retard chamber Re and advance chamber Ad) due to the alternating torque.

In the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 are provided apart from each other in the radial direction of the housing body 4.

In the conventional valve timing control device, the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42 in this embodiment are formed integrally. Therefore, the space between the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42 cannot be used as a seating surface of the front plate 5, and the front plate 5 is deformed. There was a fear.

Therefore, in the present embodiment, the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42 are arranged apart from each other in the radial direction. A radially separated portion X between the first to fourth small-diameter annular grooves S12, S22, S32, S42 can be used as a seating surface of the front plate 5 (see FIG. 6). Thereby, deformation of the front plate 5 when the front plate 5 is fastened by the first to fourth bolts B1 to B4 can be suppressed.

In the present embodiment, the large-diameter annular seal ring 90 abuts on the outer surface in the radial direction of the large-diameter annular groove 43, and the first small-diameter annular seal ring 91 is provided in the first small-diameter annular groove S12. Abut the inner surface of the direction.

In the conventional valve timing control device described above, since the seal ring is formed in an irregular shape, it is difficult to arrange the entire seal ring in one radial direction of the annular groove, and the seal ring is substantially intermediate in the radial direction of the annular groove. Was located in a position. As a result, the seal ring may move in the radial direction with the supply and discharge of the hydraulic oil to and from each of the control chambers (retard chamber Re and advance chamber Ad), which may cause wear of the seal ring. .

Therefore, in the present embodiment, the large-diameter annular seal ring 90 is located radially outward of the large-diameter annular groove 43, and the first to fourth small-diameter annular seal rings 91 to 94 are located in the first to fourth small-diameter annular grooves S12 and S22. , S32, and S42 are arranged close to each other in the radial direction. As a result, the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 move due to the supply and discharge of the hydraulic oil to and from the control chambers (the retard chamber Re and the advance chamber Ad). Can be suppressed. As a result, the wear of the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 can be suppressed, and the durability of the device is improved.

In the present embodiment, the wire diameter of the large-diameter annular seal ring 90 is larger than the wire diameter of the first small-diameter annular seal ring 91.

For example, when the front plate 5 is fastened, the outer peripheral side of the front plate 5 is separated from the axial end face of the housing body 4 (the cylindrical portion 41) by the axial force of the bolt as shown by a broken line in FIG. There is a possibility that the so-called mouth-opening deformation is caused, and the sealing performance of the large-diameter annular seal ring 90 is deteriorated.

Therefore, in the present embodiment, the wire diameter of the large-diameter annular seal ring 90 is set to be relatively larger than the wire diameter of the first to fourth small-diameter annular seal rings 91 to 94. Accordingly, even when the outer peripheral side of the front plate 5 is deformed by the opening due to the axial force of the bolt, the large-diameter annular seal ring 90 can follow the inner surface of the front plate 5 that has been deformed by the opening. 6), the sealing performance of the large-diameter annular seal ring 90 is improved.

On the other hand, since the wire diameters of the first to fourth small-diameter annular seal rings 91 to 94 are set relatively small, the first to fourth small-diameter annular seal rings 91 to 94 are fitted therein. The outer diameter of the small-diameter annular grooves S12, S22, S32, S42 can be set small. Thus, in the first to fourth shoes S1 to S4, the first to fourth shoe holes S11, S21, S31, S41 can be arranged more inside (inside in the radial direction). As a result, the fastening position by the first to fourth bolts B1 to B4 approaches the radially intermediate position of each shoe S1 to S4, and the front when each vane V1 to V4 collides with each shoe S1 to S4. A circumferential displacement of the housing body 4 with respect to the plate 5 can be suppressed.

Further, the valve timing control device according to the present embodiment includes a second shoe hole S21 formed in the axial direction in the second shoe S2 of the plurality of shoes (first to fourth shoes S1 to S4); An annular second small-diameter annular groove S22 formed on the axial end surface of the second shoe S2 so as to face the front plate 5 as a plate member and surrounding the second shoe hole S21; A second small-diameter annular seal ring 92 that is disposed at S22 and hermetically seals between the second small-diameter annular groove S22 and the front plate 5;

As described above, the present invention is applicable to the plurality of shoes S1 to S4. In particular, in the present embodiment, the first to fourth small-diameter annular rings are provided for all the shoes (first to fourth shoes S1 to S4). Seal rings 91 to 94 are provided separately from the large-diameter annular seal ring 90. As a result, the erroneous assembly of the first to fourth small-diameter annular seal rings 91 to 94 can be suppressed for all the shoes (the first to fourth shoes S1 to S4).

In the present embodiment, the resin P is a thermosetting resin or the anaerobic curing resin.

As described above, in the present embodiment, a thermosetting resin or an anaerobic curing resin is used as the resin P. Accordingly, the resin P can be easily filled into the holes H inside the housing body 4, and a reduction in the productivity of the apparatus can be suppressed.

Further, the method for manufacturing the valve timing control device for an internal combustion engine according to the present embodiment includes: a cylindrical portion 41 having at least one axial opening along the rotation axis Z of the camshaft 1; A plurality of shoes (first to fourth shoes S1 to S4) projecting radially inward from the portion 41 in a direction perpendicular to the rotation axis Z of the camshaft 1, and a plurality of shoes (first to fourth shoes S1 to S4) A first shoe hole portion S11 formed in the first shoe S1 in the axial direction, the housing body 4 to which the rotational force of the crankshaft is transmitted, and the cylindrical portion 41 in the axial direction. A front plate 5 as a plate member having a first plate hole 511 formed in the axial direction, which is a plate-shaped member that closes one end; Relative times A vane rotor that is disposed so as to be fixed to the camshaft 1 and protrudes outward from the rotor body 31 in the radial direction, between a plurality of shoes (first to fourth shoes S1 to S4). A plurality of vanes (first to fourth vanes V1 to V4) defining a pair of control chambers; a first bolt B1 passing through the first plate hole 511 and the first shoe hole S11; A sintering step of forming the housing body 4 by sintering, and a resin impregnating step of impregnating the housing body 4 with the resin P after the sintering step. After the resin impregnation step, a cleaning step of cleaning the resin P adhered to the surface of the housing body 4, and after the cleaning step, a front cover is formed on the cylindrical portion 41 of the housing body 4. A large-diameter annular groove forming step of forming an annular large-diameter annular groove 43 into which the large-diameter annular seal ring 90 is fitted on the axial end face facing the cover 5, and the first shoe S1 after the cleaning step. A first small-diameter annular groove forming an annular first small-diameter annular groove S12 in which a first small-diameter annular seal ring 91 surrounding the first shoe hole portion S11 is fitted on the axial end face opposed to the front plate 5 of FIG. Forming step.

As described above, according to the method of manufacturing the valve timing control device for the internal combustion engine according to the present embodiment, the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 are provided separately. . Therefore, even when the first to fourth plate holes 511 to 514 (the first to fourth shoe holes S11, S21, S31, S41) are not arranged at equal intervals, the first to fourth plate holes 511 are formed. It is possible to arrange the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 without being affected by the circumferential positions 514 to 514. Thereby, the erroneous assembly of the large-diameter annular seal ring 90 and the first to fourth small-diameter annular seal rings 91 to 94 can be suppressed.

According to the method for manufacturing a valve timing control device for an internal combustion engine according to the present embodiment, the large-diameter annular groove 43 and the first small-diameter annular groove S12 are formed by cutting.

As described above, in the method for manufacturing the valve timing control device for the internal combustion engine according to the present embodiment, the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42 are formed by cutting. The holes H from which the resin P has been washed away in the washing step can be removed by cutting. This suppresses a problem that the inside and outside communicate with each other through the holes H from which the resin P has been washed away, and it is possible to improve the sealing properties of the seal rings 90, 91 to 94.

Further, according to the method of manufacturing the valve timing control device for an internal combustion engine according to the present embodiment, in the sintering step, the large-diameter concave portion 430 for forming the large-diameter annular groove 43 is formed, and the first small-diameter annular groove is formed. A small-diameter recess S120 to be used for forming S12 is formed, and in the large-diameter annular groove forming step and the first small-diameter annular groove forming step, the large-diameter concave section 430 and the small-diameter concave section S120 are processed by the cutting process.

As described above, in the method of manufacturing the valve timing control device for the internal combustion engine according to the present embodiment, the large-diameter concave portion 430 and the small-diameter concave portion S120 formed in the sintering step are cut to form the large-diameter annular groove 43 and the fourth groove. First to fourth small-diameter annular grooves S12, S22, S32, and S42 are formed. Thereby, in the large-diameter annular groove 43 and the first to fourth small-diameter annular grooves S12, S22, S32, and S42, the holes H that are not impregnated with the resin P are removed, and the seal rings 90, 91,. The problem that the inside and the outside of 94 communicate with each other is suppressed.

According to the method for manufacturing a valve timing control device for an internal combustion engine according to the present embodiment, the resin P to be impregnated into the housing body 4 in the resin impregnation step is a thermosetting resin or an anaerobic cured resin.

As described above, in the method for manufacturing a valve timing control device for an internal combustion engine according to the present embodiment, a thermosetting resin or an anaerobic curing resin is used as the resin P impregnated in the housing body 4 in the resin impregnation step. Accordingly, the resin P can be easily filled into the holes H inside the housing body 4, and a reduction in the productivity of the apparatus can be suppressed.

According to the method for manufacturing a valve timing control device for an internal combustion engine according to the present embodiment, the cylindrical portion 41 has the pulley 42 on the outer peripheral side to which the rotational force from the crankshaft is transmitted.

As described above, in the method of manufacturing the valve timing control device for the internal combustion engine according to the present embodiment, the pulley 42 is integrally formed on the outer peripheral side of the cylindrical portion 41, so that the cylindrical portion 41 and the pulley 42 are separated. Compared to the case where the housing is formed on the body, the dimension in the radial direction of the housing body 4 can be reduced, and the size of the device can be reduced.

The present invention is not limited to the configuration of the above-described embodiment, and can be freely changed in accordance with the specification and cost of the application target as long as the above-described effects of the present invention can be obtained.

バルブ As the valve timing control device for an internal combustion engine based on the above-described embodiment, for example, the following embodiments can be considered.

That is, in one aspect, the valve timing control device for an internal combustion engine is a valve timing control device for an internal combustion engine that is capable of changing a relative rotation phase between a crankshaft and a camshaft of the internal combustion engine. A cylindrical portion formed in a cylindrical shape having one end open in the axial direction along the rotation axis, and a plurality of shoes projecting radially inward from the cylindrical portion in a direction perpendicular to the rotation axis of the camshaft; A housing body having a first shoe hole formed in the axial direction in a first shoe of a plurality of shoes, and a plate-shaped member for closing one end of the cylindrical portion in the axial direction. A plate member having a first plate hole formed in the axial direction, and a base disposed inside the cylindrical portion so as to be rotatable relative to the cylindrical portion. A rotor, comprising: a rotor body fixed to the camshaft; and a plurality of vanes projecting radially outward from the rotor body and defining a pair of control chambers between the plurality of shoes. A vane rotor, a first bolt passing through the first plate hole and the first shoe hole, and an annular large-diameter annular groove formed on the axial end surface of the cylindrical portion facing the plate member. A first small-diameter annular groove formed on the axial end surface of the first shoe so as to face the plate member and surrounding the first shoe hole; and a large-diameter annular groove. A large-diameter annular seal ring that hermetically seals the gap between the large-diameter annular groove and the plate member; and a hermetic seal disposed between the first small-diameter annular groove and the first small-diameter annular groove and the plate member. First small diameter to seal to Has a Jo seal ring, the.

In a preferred aspect of the valve timing control device for an internal combustion engine, the tubular portion is formed of a sintered metal impregnated with a resin.

In another preferred aspect, in any of the aspects of the valve timing control device for an internal combustion engine, the large-diameter annular groove and the first small-diameter annular groove are each formed in an annular shape.

In a further preferred aspect, in any of the aspects of the valve timing control device for an internal combustion engine, the large-diameter annular groove and the first small-diameter annular groove each have a cutting surface on a bottom surface or a side surface.

In still another preferred aspect, in any one of the aspects of the valve timing control device for an internal combustion engine, the cylindrical portion has a pulley on an outer peripheral side to which a rotational force from the crankshaft is transmitted.

In still another preferred aspect, in any one of the aspects of the valve timing control device for an internal combustion engine, the large-diameter annular seal ring and the first small-diameter annular seal ring are separated from each other in the radial direction of the housing body. It is provided.

In still another preferred aspect, in any of the aspects of the valve timing control device for an internal combustion engine, the large-diameter annular groove and the first small-diameter annular groove are separated from each other in the radial direction of the housing body. Is provided.

In still another preferred aspect, in any one of the aspects of the valve timing control device for an internal combustion engine, the large-diameter annular seal ring abuts the radially outer surface of the large-diameter annular groove, and The small-diameter annular seal ring is in contact with the radially inner surface of the first small-diameter annular groove.

In a further preferred aspect, in any of the aspects of the valve timing control device for an internal combustion engine, a wire diameter of the large-diameter annular seal ring is larger than a wire diameter of the first small-diameter annular seal ring.

In still another preferred aspect, in any one of the aspects of the valve timing control device for an internal combustion engine, a second shoe hole formed in the axial direction in a second shoe of the plurality of shoes; An annular second small-diameter annular groove formed on the axial end surface of the shoe so as to face the plate member and surrounding the second shoe hole, and the second small-diameter annular groove; A second small-diameter annular seal ring that hermetically seals between the small-diameter annular groove and the plate member.

In a further preferred aspect, in any of the aspects of the valve timing control device for an internal combustion engine, the resin is a thermosetting resin or an anaerobic curing resin.

As a method of manufacturing a valve timing control device for an internal combustion engine based on the above-described embodiment, for example, the following embodiments can be considered.

That is, the method of manufacturing the valve timing control device for an internal combustion engine includes, as one mode, a cylindrical portion formed at least in one end in an axial direction along a rotation axis of a camshaft; A plurality of shoes protruding inward in a radial direction perpendicular to the rotation axis of the camshaft, and a first shoe hole formed in the axial direction in a first shoe of the plurality of shoes. A plate having a housing body to which a rotational force of a crankshaft is transmitted, and a plate-shaped member closing one end in the axial direction of the cylindrical portion, the plate having a first plate hole formed in the axial direction; A member, a vane rotor disposed inside the tubular portion so as to be rotatable relative to the tubular portion, wherein the rotor body is fixed to the camshaft; A plurality of vanes protruding radially outward from the plurality of shoes and defining a pair of control chambers between the plurality of shoes; a vane rotor passing through the first plate hole and the first shoe hole. 1 volt, comprising: a sintering step of forming the housing body by sintering; and impregnating the housing body with a resin after the sintering step. A resin impregnating step, after the resin impregnating step, a washing step of washing the resin adhering to the surface of the housing body, and after the washing step, facing the plate member at the cylindrical portion of the housing body. Forming a large-diameter annular groove in which a large-diameter annular seal ring is fitted on the axial end face; and the first step after the cleaning step. A first small-diameter annular groove for forming a first small-diameter annular groove in which a first small-diameter annular seal ring surrounding the first shoe hole is fitted on the axial end face facing the plate member; And a step.

In a preferred aspect of the method for manufacturing a valve timing control device for an internal combustion engine, the large-diameter annular groove and the first small-diameter annular groove are formed by cutting. Method.

In another preferred aspect, in any one of the aspects of the method for manufacturing a valve timing control device for an internal combustion engine, in the sintering step, a large-diameter recess for forming the large-diameter annular groove is formed, and the first recess is formed. A small-diameter concave portion for forming a small-diameter annular groove is formed, and in the large-diameter annular groove forming step and the first small-diameter annular groove forming step, the large-diameter concave portion and the small-diameter concave portion are processed by the cutting process.

In still another preferred aspect, in any one of the aspects of the method for manufacturing a valve timing control device for an internal combustion engine, in the resin impregnation step, the resin to be impregnated into the housing body is a thermosetting resin or an anaerobic curing resin. It is.

In a further preferred aspect, in any of the aspects of the method for manufacturing a valve timing control device for an internal combustion engine, the tubular portion has a pulley on an outer peripheral side to which a rotational force from the crankshaft is transmitted.

Claims

A valve timing control device for an internal combustion engine capable of changing a relative rotation phase between a crankshaft and a camshaft of the internal combustion engine,
A cylindrical portion formed at least in one end in an axial direction along the rotation axis of the camshaft, and a plurality of cylindrical portions projecting from the cylindrical portion inward in a radial direction orthogonal to the rotation axis of the camshaft; A housing body having a shoe and a first shoe hole formed in the axial direction in a first shoe of the plurality of shoes;
A plate-shaped member for closing one end of the cylindrical portion in the axial direction, the plate having a first plate hole formed in the axial direction;
A vane rotor disposed inside the tubular portion so as to be rotatable relative to the tubular portion, and a rotor body fixed to the camshaft, and protruding outward from the rotor body in the radial direction, A vane rotor having a plurality of vanes defining a pair of control chambers between the plurality of shoes;
A first bolt passing through the first plate hole and the first shoe hole;
An annular large-diameter annular groove formed on the axial end surface of the cylindrical portion so as to face the plate member;
An annular first small-diameter annular groove formed on the axial end surface of the first shoe so as to face the plate member and surrounding the first shoe hole;
A large-diameter annular seal ring that is disposed in the large-diameter annular groove and hermetically seals between the large-diameter annular groove and the plate member;
A first small-diameter annular seal ring disposed in the first small-diameter annular groove to hermetically seal a gap between the first small-diameter annular groove and the plate member;
A valve timing control device for an internal combustion engine, comprising:
The valve timing control device for an internal combustion engine according to claim 1,
The valve timing control device for an internal combustion engine, wherein the tubular portion is formed of a sintered metal impregnated with a resin.
The valve timing control device for an internal combustion engine according to claim 2,
The valve timing control device for an internal combustion engine, wherein the large-diameter annular groove and the first small-diameter annular groove are each formed in an annular shape.
The valve timing control device for an internal combustion engine according to claim 3,
The valve timing control device for an internal combustion engine, wherein the large-diameter annular groove and the first small-diameter annular groove each have a cut surface on a bottom surface or a side surface.
The valve timing control device for an internal combustion engine according to claim 2,
The valve timing control device for an internal combustion engine, wherein the cylindrical portion has a pulley on an outer peripheral side to which a rotational force from the crankshaft is transmitted.
The valve timing control device for an internal combustion engine according to claim 1,
The valve timing control device for an internal combustion engine, wherein the large-diameter annular seal ring and the first small-diameter annular seal ring are provided apart from each other in the radial direction of the housing body.
The valve timing control device for an internal combustion engine according to claim 5,
The valve timing control device for an internal combustion engine, wherein the large-diameter annular groove and the first small-diameter annular groove are provided apart from each other in the radial direction of the housing body.
The valve timing control device for an internal combustion engine according to claim 1,
The large-diameter annular seal ring is in contact with the radially outer surface of the large-diameter annular groove,
A valve timing control device for an internal combustion engine, wherein the first small-diameter annular seal ring abuts on the radially inner surface of the first small-diameter annular groove.
The valve timing control device for an internal combustion engine according to claim 1,
A valve timing control device for an internal combustion engine, wherein a wire diameter of the large-diameter annular seal ring is larger than a wire diameter of the first small-diameter annular seal ring.
The valve timing control device for an internal combustion engine according to claim 1,
A second shoe hole formed in the axial direction in a second shoe of the plurality of shoes;
An annular second small-diameter annular groove formed on the axial end surface of the second shoe so as to face the plate member and surrounding the second shoe hole;
A second small-diameter annular seal ring disposed in the second small-diameter annular groove to hermetically seal a gap between the second small-diameter annular groove and the plate member;
A valve timing control device for an internal combustion engine, comprising:
The valve timing control device for an internal combustion engine according to claim 2,
The said resin is a thermosetting resin or an anaerobic hardening resin, The valve timing control apparatus of the internal combustion engine characterized by the above-mentioned.
A cylindrical portion formed at least in one end in the axial direction along the rotation axis of the camshaft, and a plurality of shoes protruding from the cylindrical portion inward in a radial direction orthogonal to the rotation axis of the camshaft; A housing body having a first shoe hole formed in the first shoe in the axial direction in the first shoe of the plurality of shoes, and transmitting a rotational force of a crankshaft;
A plate member that closes one end in the axial direction of the cylindrical portion, the plate member having a first plate hole formed in the axial direction;
A vane rotor disposed inside the tubular portion so as to be rotatable relative to the tubular portion, and a rotor body fixed to the camshaft, and protruding outward from the rotor body in the radial direction, A vane rotor having a plurality of vanes defining a pair of control chambers between the plurality of shoes;
A first bolt passing through the first plate hole and the first shoe hole;
A method for manufacturing a valve timing control device for an internal combustion engine, comprising:
A sintering step of forming the housing body by sintering,
After the sintering step, a resin impregnation step of impregnating the housing body with a resin,
After the resin impregnation step, a washing step of washing the resin adhered to the surface of the housing body,
After the washing step, a large-diameter annular groove is formed on the axial end face of the cylindrical portion of the housing body facing the plate member, in which a large-diameter annular seal ring is fitted. Process and
After the cleaning step, an annular first small-diameter annular groove into which a first small-diameter annular seal ring surrounding the first shoe hole is fitted on the axial end face of the first shoe facing the plate member. Forming a first small-diameter annular groove;
A method for manufacturing a valve timing control device for an internal combustion engine, comprising:
A method for manufacturing a valve timing control device for an internal combustion engine according to claim 12,
The method for manufacturing a valve timing control device for an internal combustion engine, wherein the large-diameter annular groove and the first small-diameter annular groove are formed by cutting.
The method for manufacturing a valve timing control device for an internal combustion engine according to claim 13,
In the sintering step, a large-diameter concave portion for forming the large-diameter annular groove is formed, and a small-diameter concave portion for forming the first small-diameter annular groove is formed.
The method for manufacturing a valve timing control device for an internal combustion engine, wherein the large-diameter concave portion and the small-diameter concave portion are machined by the cutting in the large-diameter annular groove forming step and the first small-diameter annular groove forming step.
The method for manufacturing a valve timing control device for an internal combustion engine according to claim 13,
The method for manufacturing a valve timing control device for an internal combustion engine, wherein the resin to be impregnated in the housing body in the resin impregnation step is a thermosetting resin or an anaerobic curing resin.
A method for manufacturing a valve timing control device for an internal combustion engine according to claim 12,
The method for manufacturing a valve timing control device for an internal combustion engine, wherein the cylindrical portion has a pulley on an outer peripheral side to which a rotational force from the crankshaft is transmitted.