JP2016098780A - Internal combustion engine valve timing control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine valve timing control system capable of reducing the number of portions required to be positioned simultaneously when constituent components are assembled and capable of improving assembly working efficiency.SOLUTION: An internal combustion engine valve timing control system comprises: a VTC cover 40 which is disposed to cover front end sides of both an intake-side VTC 1 and an exhaust-side VTC 2; an adapter 45 which has a second opening part 49 that is positioned and held, via two positioning pins 44 and two positioning holes 51b, in an inner circumferential edge of a first opening part 42 provided in an intake-side VTC-side front end portion of the VTC cover and that has an oil seal 53 sealing a gap between an outer circumferential surface of an electric motor 10 and an outside and held in a holding groove 52 in an inner circumference of the second opening part 49; and a cover member 55 that closes the second opening part from outside and that is fixed to the adapter via the same positioning pins and positioning holes 56b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve timing control system for an internal combustion engine that includes, for example, two valve timing control devices that control opening and closing timings of an intake valve and an exhaust valve, respectively.

  As a valve timing control device for an internal combustion engine, a device described in the following Patent Document 1 previously filed by the present applicant is known.

  This valve timing control device is an electric type attached to the intake valve side, and the motor housing of the electric motor is integrally coupled to the timing sprocket, and is traversed so as to cover the front end side of the motor housing. A substantially cup-shaped cover member is disposed on the surface. An annular oil seal is interposed between the inner peripheral surface of the step portion formed on the outer peripheral portion of the cover member and the outer peripheral surface of the motor housing.

  The oil seal is mainly composed of a synthetic rubber material, and an annular base portion on the outer peripheral side made of solid rubber is press-fitted and fixed to the inner peripheral surface of the stepped portion, while the inner peripheral side is connected to the outer peripheral surface of the motor housing. An annular seal portion and a seal lip that are slidably contacted are provided. The seal portion is urged toward the outer peripheral surface of the motor housing by a backup spring.

  The oil seal seals between the motor housing and the cover member, thereby preventing the oil scattered from the timing sprocket side from entering the motor housing from the front end direction of the electric motor. Yes.

JP 2010-242721 A

  By the way, some valve timing control devices are attached to the exhaust valve side in addition to the intake valve side, and these two valve timing control devices on the intake side and the exhaust side are connected together on the front end side. A VTC cover is provided so as to cover it.

  The VTC cover is bolted while being positioned on the cylinder head of the engine, and is provided with a detection unit of an angle sensor that detects the rotation angle of the motor output shaft of the electric motor of the intake side valve timing control device. For example, in a hydraulic exhaust-side valve timing control device, a convex passage constituting portion that supplies hydraulic pressure to the inside of the housing is formed.

  As described above, the VTC cover is formed with angle sensors and passage components required for the valve timing control devices on the intake side and the exhaust side. Therefore, when assembling and fixing the VTC cover to the cylinder head, First, the positioning of the VTC cover to the cylinder head, the positioning of the detection part and the detected part on the intake side, the positioning of the housing and the passage component on the exhaust side, and further the positioning of the oil seal and the motor housing Many positioning operations such as positioning must be performed simultaneously.

  For this reason, the work of assembling the VTC cover with respect to the cylinder head is complicated, and this assembling work efficiency is reduced.

  The present invention has been devised in view of the above-described conventional technical problems, and can reduce the number of positioning parts that must be performed simultaneously when assembling components, thereby improving the assembly work efficiency. It aims to provide a valve timing control system.

  The invention according to claim 1 of the present application is, in particular, a first fixing member that is attached and fixed to a chain case and is arranged so as to cover the front end sides of both the intake side valve timing control device and the exhaust side valve timing control device. And a first opening formed at a position corresponding to the axial direction of the electric motor at the front end of the intake side valve timing control device of the first fixing member, and fitted to the periphery of the first opening A second fixing member having a second opening that is held and a sealing member that seals between the outer peripheral surface of the electric motor is held on the inner peripheral portion, and the second opening is closed from outside And a cover member positioned and fixed to the first fixing member via a second fixing member.

  According to the present invention, when assembling each component part, the number of positioning locations that must be performed simultaneously can be reduced, so that the assembling work is facilitated and the assembling work efficiency can be improved.

1 is an exploded perspective view showing a first embodiment of a valve timing control system according to the present invention. It is a cross-sectional view of the valve timing control system of this embodiment. The VTC cover used for this embodiment is shown, A is a perspective view of an outer surface, B is a perspective view of an inner surface. It is a longitudinal section showing the state where the adapter was assembled to the VTC cover provided for this embodiment. It is a disassembled perspective view of the valve timing control system which shows 2nd Embodiment of this invention. It is a cross-sectional view of the valve timing control system of this embodiment. It is a perspective view which shows the VTC cover provided for this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a valve timing control system for an internal combustion engine according to the present invention will be described with reference to the drawings.

  In this embodiment, it is assumed that valve timing control devices are respectively provided on the intake valve side and the exhaust side of the internal combustion engine.

  First, an intake side valve timing control device (hereinafter referred to as an intake side VTC1) is an electric type device similar to that described in Japanese Patent Application Laid-Open No. 2010-242721 described as the prior art, and an exhaust side. The valve timing control device (hereinafter referred to as the exhaust side VTC2) is, for example, a hydraulic type similar to that described in Japanese Patent Application Laid-Open No. 2013-224619 filed earlier by the present applicant. explain.

  As shown in FIGS. 1 and 2, the intake-side VTC 1 is rotated via a bearing (not shown) on an intake-side sprocket 3 that is a drive rotating body that is rotationally driven by a crankshaft and a cylinder head S that is an engine body. An intake side camshaft 4 that is supported freely and is provided relative to the intake side sprocket 3 so as to be relatively rotatable, and is disposed between the intake side sprocket 3 and the intake side camshaft 4, according to the engine operating state. And a phase change mechanism 5 for changing the relative rotational phases of the three and the four.

  The intake-side sprocket 3 is formed integrally with an iron-based metal in an annular shape, and an inner peripheral surface is formed integrally with the outer periphery of the sprocket body 3a, and a sprocket body 3a formed with a stepped diameter shape, It comprises a gear portion 3b that receives the rotational force from the crankshaft via a wound timing chain (not shown), and an internal tooth constituent portion 6 that is integrally provided on the front end side of the sprocket body 3a. .

  The intake-side camshaft 4 has two drive cams per cylinder for opening an intake valve (not shown) on the outer periphery, and a follower member 8 integrally provided at one end is driven by a cam bolt 9. Fixed from the axial direction.

  The phase changing mechanism 5 is mainly composed of an electric motor 10 bolted to the intake side sprocket 3 and a speed reduction mechanism 11 that reduces the rotational speed of the electric motor 10 and transmits it to the intake side camshaft 4. ing.

  The electric motor 10 is a brushed DC motor, and includes a motor housing 12 that is a yoke that rotates integrally with the intake-side sprocket 3, and a motor output shaft 13 that is rotatably provided inside the motor housing 12. And four permanent magnets 14 each having an arc shape which is a stator fixed to the inner peripheral surface of the motor housing 12 by an adhesive, and the power feeding plate 15 fixed to the front end portion of the motor housing 12. .

  The motor output shaft 13 is formed in a stepped cylindrical shape and functions as an armature, and has a stepped portion formed at a substantially central position in the axial direction and a large rear end side (intake side camshaft 4 side) from the stepped portion. It is comprised from a diameter part and the small diameter part of the front-end | tip part side from a level | step-difference part. An iron core rotor 17 is fixed to the outer periphery of the large-diameter portion where the step portion is located, and an eccentric shaft portion 18 constituting a part of the speed reduction mechanism 11 is integrally formed on the rear end side.

  On the other hand, a commutator 19 is press-fitted and fixed to the outer periphery of the small-diameter portion. The commutator 19 has an outer diameter substantially the same as the outer diameter of the large-diameter portion, and the axial direction of the small-diameter portion. It is arranged at almost the center position.

  The iron core rotor 17 is formed of a magnetic material having a plurality of magnetic poles, and the outer peripheral side is configured as a bobbin having a slot around which the coil wire of the coil 19 is wound. The inner peripheral portion of the iron core rotor 17 is the motor output. The shaft 13 is fixed to the outer periphery of the stepped portion while being positioned in the axial direction.

  On the other hand, the commutator 19 is formed in an annular shape by a conductive material, and the terminal of the coil wire led out of the coil 19 is electrically connected to each segment divided into the same number of poles as the iron core rotor 17 by soldering. It is connected to the.

  The power feeding plate 15 is accommodated in a pair of copper cylindrical brush holders fixed by a plurality of rivets, and is slidably accommodated in the radial direction inside each brush holder. A pair of switching brushes 20 which are commutators whose arcuate tip surfaces elastically contact the outer peripheral surface of the commutator 19 from the radial direction, and inner and outer double power supply mold-fixed with their outer surfaces exposed. Slip rings 21a and 21b are provided.

  In addition, the intake side sprocket 3 (internal gear component 6) and the housing 12 are fastened together by a plurality of bolts 22 from the axial direction.

  The cam bolt 9 has an axial end face that supports the inner ring of the small-diameter ball bearing 23 from the axial direction, and is formed on the outer periphery of the shaft portion from the end of the intake side camshaft 4 to the internal axial direction. A male screw that is screwed onto the female screw is formed.

  The follower member 8 is formed of a ferrous metal in a cylindrical shape, and is fixed to the intake camshaft 4 by a cam bolt 9 and a disk-shaped fixed end portion, and an axially extending front end surface of the fixed end portion. A protruding cylindrical portion and a cylindrical cage 24 formed integrally with the outer peripheral portion of the fixed end portion and holding a plurality of rollers 23 are configured.

  The cylindrical portion is formed with a through hole through which the shaft portion of the cam bolt 9 is inserted in the center, and a needle bearing 25 is provided on the outer peripheral side.

  The retainer 24 is bent into a substantially L-shaped cross section forward from the front end of the outer peripheral portion of the fixed end portion, and is formed in a bottomed cylindrical shape protruding in the same direction as the cylindrical portion, and is cylindrical. At substantially equidistant positions in the circumferential direction of the front end portion, a plurality of substantially rectangular roller holding holes that respectively hold the plurality of rollers 23 so as to freely roll are formed at equidistant positions in the circumferential direction. The roller holding hole is formed in an elongated shape in the front-rear direction with the front end side closed, and the total number thereof is smaller than the total number of internal teeth of the internal tooth component 6, thereby The reduction ratio is obtained.

  Between the small diameter part of the motor output shaft 13 and a cover member 55 described later, the angle sensor 26 for detecting the rotational angle position of the motor output shaft 13 is provided.

  The angle sensor 26 is of an electromagnetic induction type, and is detected at a substantially central position of the detected part 27 and the cover member 55 partially fixed in the small diameter part of the motor output shaft 13, and the detected part. And a detection unit 28 that receives a detection signal from 27.

  The detected portion 27 includes a substantially bottomed cylindrical support portion 27a made of a synthetic resin material, and a three-leaf-shaped thin detected rotor 27b fixed to the outer surface of the bottom wall at the tip end in the axial direction of the support portion. , And an annular projection that is press-fitted into the inside of the small diameter portion of the motor output shaft 13 is integrally provided on the outer periphery of the rear end portion of the support portion 27a.

  Further, the support portion 27a has a tip portion protruding from the tip of the small diameter portion of the motor output shaft 13 inserted into the concave groove of the cover member 55, and the detected rotor 27b has a thin bottom wall with a concave groove. Are arranged opposite to each other with a minute clearance.

  The detection unit 28 includes a substantially rectangular printed board 28a extending in a radial direction from a substantially central position of the cover member 55, and an integrated circuit (ASIC) provided on the outer surface of one end of the printed board 28a in the longitudinal direction. ) 28b and a receiving coil and an exciting coil (not shown) provided on the other end side of the same outer surface as the integrated circuit 28b and arranged coaxially with the detected rotor 27b.

  The printed circuit board has a small positioning hole formed in the center of the receiving and exciting coils, and the center of the detected rotor 27b and the center of the receiving and exciting coils are positioned through the positioning small holes. It has become.

  An induced current flows between the receiving and exciting coils and the detected rotor 27b, and the integrated circuit detects the rotation angle of the motor output shaft 13 by this electromagnetic induction action, and this detection signal is sent to the control unit. It is designed to output.

Then, a control current is output from the control unit to the electric motor 10, and the driven member 8 is rotated forward and backward via the speed reduction mechanism 11 to move the intake side camshaft 4 to the intake side sprocket 3. Relative rotation is performed, thereby controlling the opening / closing timing of each intake valve in accordance with the engine operating state.
[Exhaust side VTC]
As schematically shown in FIG. 2, the exhaust side VTC 2 includes an exhaust side sprocket 29 having a gear portion 29a around which the same timing chain as the intake side sprocket 3 is wound, and a cylinder head S that is an engine body. The exhaust side camshaft 304 is rotatably supported via a bearing (not shown) and is relatively rotatably provided on the exhaust side sprocket 29, and the exhaust side sprocket 29 and the exhaust side camshaft 30 And a phase changing mechanism 31 that is disposed between the two and changes the relative rotational phase of the two and 29 according to the engine operating state.

  The phase changing mechanism 31 is fixed to a cylindrical housing 32 disposed at the front end portion of the exhaust side sprocket 29 and one end portion of the exhaust side camshaft 30, and is provided in the housing 32 so as to be relatively rotatable. The four vane rotors 33 are separated from each other by four shoes on the inner peripheral surface of the housing 32 and four vane portions 33b provided radially on the outer periphery of the rotor portion 33a of the vane rotor 33. It is mainly composed of a corner oil chamber 34 and an advance oil chamber 35, and a hydraulic circuit that supplies and discharges oil pressure to and from each oil chamber 34, 35.

  The exhaust camshaft 30 is provided on the outer peripheral surface with two per-cylinder driving cams (not shown) for opening and closing each exhaust valve, and the vane rotor 33 is fixed to one end by a cam bolt 36. ing.

  The housing 32 has a front end opening closed by a front plate 37 and a rear end opening closed by an exhaust side sprocket 29 also serving as a rear plate. The housing 32 and the front plate 37 are connected to an exhaust side sprocket 29. The four bolts 38 are fastened together from the axial direction.

  In the vane rotor 33, a bottomed insertion hole 33c through which the cam bolt 36 is inserted is formed along the axial direction at the center position of the rotor portion 33a, while the insertion hole is formed at the center position of the front plate 37. A large diameter hole 37a having a diameter larger than 33c is formed.

  The hydraulic circuit includes a retard passage and an advance passage for supplying and discharging hydraulic pressure to the retard oil chamber 34 and the advance oil chamber 35, an oil pump for supplying hydraulic pressure to each passage via a discharge passage, An electromagnetic switching valve is provided between the oil pump and each passage and selectively switches between each passage and the discharge passage or the drain passage.

  The electromagnetic switching valve is a four-way two-position valve, and is operated by a control current from the control unit so as to selectively communicate and block the discharge passage and the drain passage with respect to the retard passage and the advance passage. It has become.

  As a result, the hydraulic pressure is supplied to each retard oil chamber, while the hydraulic oil in each advance oil chamber is discharged, or the hydraulic pressure is supplied to each advance oil chamber, while the operation in each retard hydraulic circuit is performed. The oil is discharged, and the vane rotor 33 is rotated relative to the housing 32 in the retarded or advanced direction. Thereby, the opening / closing timing of each exhaust valve is controlled according to the engine operating state.

  A VTC cover 40, which is a first fixing member, is disposed on the front end side of the intake side VTC1 and the exhaust side VTC2.

  The VTC cover 40 is integrally formed of an aluminum alloy material, and as shown in FIGS. 1 to 4, the VTC cover 40 has an elliptical shape that is long in the lateral direction so as to cover the front ends of both the intake side VTC 1 and the exhaust side VTC 2. A plurality of circular boss portions 41 formed integrally with bolt holes 41a through which bolts for fixing to the cylinder head S are inserted via a chain case (not shown) are formed integrally on the outer periphery. It has been. Further, of the plurality of boss portions 41, the two boss portions 41 located on the outer peripheral one side portion and the other side portion are provided with two first protrusions previously projected on the chain case as shown in FIG. 3B. Two first positioning holes 41b and 41b into which the positioning pins are inserted are formed.

  The VTC cover 40 has a circular first opening 42 penetratingly formed at an end portion on the side of the intake side VTC1 in the horizontal direction. The first opening 42 has a relatively large diameter and is sized to fit the front end of the intake side VTC1.

  In addition, a semicircular arc-shaped support wall 42a is formed integrally with the lower part of the annular peripheral wall forming the first opening 42 on the intake side VTC1 side, and the outer periphery of the peripheral wall is substantially in the circumferential direction. Four projecting female thread forming portions 43 are integrally provided at 90 ° positions, and female thread holes 43 a are formed in the respective female thread forming portions 43. Of the four female screw forming portions 42, the two female screw constituting portions 43, 43 on the lower side in FIG. 1 are extended in the circumferential direction, and the female screw holes 43a, 43a are formed on one side in the circumferential direction. Two second positioning pins 44, 44 are press-fitted and fixed on the other side.

  Further, the VTC cover 40 is integrally formed with a passage constituting portion 46 forming a part of the hydraulic circuit on the exhaust side VTC 2 side in the lateral direction. As shown in FIGS. 1 and 2, the passage component 46 is formed such that a part of the outer wall surface of the VTC cover 40 bulges out in a cylindrical shape, and a part of the retard passage and the advance passage inside. A V-shaped passage wall 46 in which a pair of passage portions 46a and 46ba are formed, and a substantially central portion of the inner wall surface of the VTC cover 40, and protrudes from the passage portions 46a and 46b in the inner axial direction. And a columnar shaft portion 47 in which a pair of communicating holes 47a and 47b are formed.

  The shaft-like portion 47 is press-fitted and fixed in the insertion hole 33c of the rotor portion 33a of the vane rotor 33, and an oil groove hole 47b that communicates each retarded angle oil chamber 34 and the one communication hole 47a on the outer peripheral surface. And three annular sealing grooves 47c are formed. The other communication hole 47b and each advance oil chamber 35 communicate with each other via an oil chamber 48 formed between the front end surface of the shaft-like portion 47 and the insertion hole 33c. .

  In addition, an adapter 45 as a second fixing member is fitted and held in the first opening 42. As shown in FIGS. 1, 2 and 4, the adapter 45 is formed in an approximately annular shape by an aluminum alloy material, and a second opening 49 having the same diameter as the first opening 42 is formed in the center. Four circular hole constituent portions that are formed to penetrate and that have bolt insertion holes 51a through which four bolts 50 that are screwed into the respective female screw holes 43a of the VTC cover 40 are inserted. 51 is provided integrally. Two lower positioning holes 51 b and 51 b into which the two second positioning pins 44 and 44 of the VTC cover 40 are inserted are formed in the lower two of the hole constituting portions 51.

  The second opening 49 is formed with a step-shaped holding groove 52 on the inner periphery of the rear end of the VTC cover 40, and the holding groove 52 has an outer periphery of the front end of the motor housing 12 of the electric motor 10 and the outside. An oil seal 53 which is a seal member for sealing between the two is press-fitted and held.

  The adapter 45 has an outer diameter that is slightly smaller than the inner diameter of the first opening 42 of the VTC cover 40, and can be fitted to the inner peripheral surface of the first opening 42. A flange-like annular projection 45a is integrally formed on the outer periphery of the part for positioning in the axial direction when the first opening 42 is fitted from the rear end side.

  Further, as shown in FIGS. 2 and 4, a circular seal ring 54 is fitted and fixed on the outer peripheral surface of the adapter 45 so as to elastically contact the inner peripheral surface of the first opening 42. An annular seal groove 45b is formed.

  Further, a cover member 55 that covers the front end side of the second opening 49 is provided on the rear end surface of the adapter 45. The cover member 55 is formed of a synthetic resin material in which an internal metal plate-like reinforcing plate is molded, and the detection portion of the angle sensor 26 is provided at the center position of the inside, and at almost the center position of the inner end surface. A step recess groove 55a into which the tip of the support portion 27a of the detected portion 27 is fitted is formed, and a hole forming portion 56 in which insertion holes 56a through which the four bolts 50 are inserted is formed on the outer periphery. Is provided.

  In addition, among the four hole forming portions 56, in the two lower hole forming portions 56 in FIG. 1, the second positioning pins 44, 44 of the VTC cover 40 are provided with the positioning holes 51b of the adapter 45, respectively. Two third positioning holes 56b and 56b that are inserted through 51b are formed.

  In the cover member 55, a disk-shaped lid portion 57 that covers the opening on the detection portion 28 side is press-fitted and fixed to an annular protrusion on the outer side.

The cover member 55 has a signal connector 58 for transmitting a rotation angle signal of the motor output shaft 13 detected by the angle sensor 26 to a control unit (not shown) and two power supplies provided on the cover member 55. A power supply connector 60 for supplying power to the electric motor 10 from the brushes 59a and 59b via the slip rings 21a and 21b is integrally provided.
[Effects of this embodiment]
Therefore, according to the present embodiment, positioning of the VTC cover 40 with respect to the chain case and positioning of the VTC cover 40 with respect to the shaft-like portion 47 of the passage constituting portion 46 and the insertion hole 33c of the rotor portion 33a are performed simultaneously. Regarding the positioning of the detected portion 27 on the motor output shaft 13 side of the intake side VTC1 and the detecting portion 28 on the cover member 55 side, and the positioning of the oil seal 53 and the motor housing 12, the above two positioning are: Do it separately.

  That is, the positioning of the VTC cover 40 with respect to the chain case is performed by engaging the first positioning holes 41b and 41b formed in the VTC cover 40 with the first positioning pins fixed to the chain case. Positioning is performed while centering the shaft-like portion 47 of the cover 40 and the insertion hole 33c of the rotor portion 33a. Thereafter, the VTC cover 40 is fixed to the chain case by tightening a plurality of bolts (not shown) through the bolt insertion holes 41a of the VTC cover 40.

  On the other hand, the oil seal 53 is press-fitted and fixed in advance to the holding groove 52 of the adapter 45 via the outer peripheral base, and the seal ring 54 is fitted and fixed to the seal groove 45b. In this state, the adapter 45 is fitted into the first opening 42 of the VTC cover 40. At this time, the second positioning holes 44, 44 fixed to the VTC cover 40 are connected to the second positioning holes of the adapter 45. 51b and 51b are engaged and fitted while positioning. At the same time, the inner peripheral seal portion of the oil seal 53 is assembled while being fitted so as not to come from the front end side of the outer peripheral surface of the motor housing 12.

  Thereafter, the cover member 55 is brought into contact with the outer end surface of the adapter 45. At this time, the cover member 55 is covered with the distal end portions of the positioning pins 44 and 44 protruding from the second positioning holes 51b and 51b. While engaging the third positioning holes 56b, 56b of the member 55 to position the cover member 55 with respect to the adapter 45, the tip of the support portion 27a of the detected portion 27 is fitted into the stepped groove 55a. The to-be-detected rotor of the support part 27a is opposed to the reception and excitation coils of the detection part 28 on the cover member 55 side.

  Thereafter, the front end portion of each bolt 50 is screwed into each female screw hole 43 a of the VTC cover 40 while being inserted into each bolt insertion hole 56 a of the cover member 55 and each bolt insertion hole 51 a of the adapter 45.

  Accordingly, the cover member 55 and the adapter 45 are fixed without being positioned on the VTC cover 40 by the bolts 50.

  Therefore, in this embodiment, many positioning operations are not performed simultaneously when assembling each component, but the positioning of the VTC cover 40 with respect to the chain case, the passage component 46 of the VTC cover 40, the exhaust side VTC 2 The positioning of the VTC cover 40, the intake side VTC1 (angle sensor 26), the oil seal 53, and the like is performed separately using the adapter 45. In addition to the improvement, the assembling work is simplified, and the assembling work efficiency can be improved.

  In particular, the adapter 45 and the cover member 55 are positioned through the positioning holes 51b, 51b, 56b, 56b using the same positioning pins 44, 44 fixed to the VTC cover 40. The positioning accuracy of both 45 and 55 is further increased, and positioning work is facilitated.

  Further, in this embodiment, after the VTC cover 40 is assembled to the chain case, the outer peripheral surface of the motor housing 12 is inserted from the outside of the second opening 49 of the adapter 45 into the motor housing 12 of the inner peripheral seal portion of the oil seal 53. In this case, it is possible to make the inner seal part and the like properly contact the outer peripheral surface of the motor housing 12.

  As a result, it is possible to sufficiently suppress the occurrence of a sealing failure due to the oil seal 53 and to ensure a stable sealing performance. Therefore, it is possible to effectively prevent the lubricating oil from flowing into the motor housing 12 from the intake side sprocket 3 side. Can be blocked. As a result, the current supply to the electric motor 12 due to the leaked oil is not deteriorated.

Further, since the oil seal 53 is positioned in the axial direction by the step surface of the holding groove 52 of the adapter 45, the attaching operation to the holding groove 52 becomes easy.
[Second Embodiment]
5 to 7 show a second embodiment, in which the exhaust side VTC 2 of the internal combustion engine is also electrically driven with the same structure as the intake side VTC 1, and each component is also common.

  Therefore, the structure of the exhaust VTC2 is assigned the same reference numeral as that of the intake side VTC1 of the first embodiment, and a detailed description thereof is omitted.

  The VTC cover 40 has a third opening 62 formed on the exhaust side in addition to the first opening 42 on the intake side, and a second adapter 63 fitted and held in the third opening 62. In addition, a second cover member 64 is attached to the second adapter 63.

  On the outer periphery of the VTC cover 40, in addition to the plurality of boss portions 41, four female screw hole constituting portions 43 each having female screw holes 43 a are formed similarly to the intake side, and two female screw constituting portions 43 are formed. Two positioning pins 44 are press-fitted and fixed.

  On the outer periphery of the second adapter 63, four hole constituent parts 51 each having bolt insertion holes 51a are integrally formed, and the lower two hole constituent parts 51 are positioned outside the figure. It is the same as the first adapter 45 that the hole is formed.

  The second cover member 64 has the same structure as the cover member 55 in the first embodiment, and is provided with four hole forming portions 56 each having a bolt insertion hole 56a formed on the outer periphery.

  Therefore, according to this embodiment, after the VTC cover 40 is bolted to the chain case, the openings 45 and 63 are positioned on the VTC cover 40 by the positioning pins and the positioning holes. To fit and hold. Thereafter, the adapters 45 and 63 are respectively fixed by the four bolts 50 and 65 while positioning the cover members 55 and 64 via the positioning pins 44 and the positioning holes 51b and 56b with respect to the adapters 45 and 63, respectively. And fastened to the VTC cover 40 together.

  Thus, in the present embodiment, not only the intake side but also the exhaust side can be individually positioned via the second adapter 63, so that the overall positioning accuracy including the intake side is further increased, and the positioning is performed. Work becomes easy and the efficiency of the assembling work of each component can be improved.

  The present invention is not limited to the configuration of each of the embodiments described above, and the structure of the VTC cover 40 can be further changed, and this material is also made of, for example, a synthetic resin material in order to further reduce the weight. It is also possible to form.

  The VTC cover can be formed integrally with the chain case. In this case, the VTC cover is directly bolted to the cylinder head or the like.

  Furthermore, even if a hydraulic type is adopted for the intake side VTC and an electric type is adopted for the exhaust side VTC, the same effect as the above embodiment can be obtained.

1 ... Intake side VTC (Intake side valve timing control device)
2 ... Exhaust side VTC (Exhaust side valve timing control device)
DESCRIPTION OF SYMBOLS 3 ... Intake side sprocket 4 ... Intake side camshaft 5 ... Intake side phase change mechanism 10 ... Electric motor 11 ... Deceleration mechanism 13 ... Motor output shaft 26 ... Angle sensor (rotation angle detection mechanism)
27 ... detected part 28 ... detecting part 29 ... exhaust side sprocket 30 ... exhaust side camshaft 31 ... exhaust side phase changing mechanism 40 ... VTC cover (first fixing member)
41 ... boss 41b ... first positioning hole 42 ... first opening 43 ... internal thread forming portion 44 ... second positioning pin 45 ... adapter (second fixing member)
46 ... passage component 47 ... shaft-like portion 49 ... second opening 51 ... hole component 51b ... second positioning hole 53 ... oil seal (seal member)
55 ... Cover member 56 ... Hole forming portion 56b ... Third positioning hole

Claims (7)

An intake side valve timing control device that is arranged coaxially with the intake side camshaft and electrically controls the opening and closing timing of the intake valve and an exhaust side camshaft that is arranged coaxially with the intake side camshaft, and hydraulically or electrically controls the opening and closing timing of the exhaust valve. In a valve timing control system for an internal combustion engine comprising an exhaust side valve timing control device for controlling,
A first fixing member that is mounted and fixed to an engine body or a chain case, and is arranged so as to cover the front end sides of both the intake side valve timing control device and the exhaust side valve timing control device;
A first opening formed at a position corresponding to the axial direction of the electric motor at the front end of the intake side valve timing control device of the first fixing member;
A second fixing member having a second opening that is fitted and held at the periphery of the first opening, and a sealing member that holds a seal between the inner periphery and the outer peripheral surface of the electric motor;
A cover member positioned and fixed to the first fixing member via the second fixing member while closing the second opening from the outside;
A valve timing control system for an internal combustion engine, comprising: The valve timing control system for an internal combustion engine according to claim 1,
The exhaust side valve timing control device is configured hydraulically,
A passage constituting portion that is provided in the first fixing member and constitutes an oil passage for supplying hydraulic pressure to a working chamber formed inside the housing of the exhaust side valve timing control device is formed inside,
A valve timing of an internal combustion engine, wherein the passage constituting portion has a shaft-like portion protruding from an inner end surface of the first fixing member and fitted into the housing from an axial direction of an exhaust side camshaft. Control system. The valve timing control system for an internal combustion engine according to claim 1 or 2,
The valve timing control system for an internal combustion engine, wherein the first fixing member is positioned with respect to the engine body or chain case via a positioning pin. The valve timing control system for an internal combustion engine according to any one of claims 1 to 3,
The valve timing control system for an internal combustion engine, wherein the second fixing member is positioned with respect to the first fixing member via a positioning pin. The valve timing control system for an internal combustion engine according to claim 4,
The valve timing control system for an internal combustion engine, wherein the cover member is positioned and fixed together with the second fixing member via the positioning pin with respect to the first fixing member. The valve timing control system for an internal combustion engine according to any one of claims 1 to 5,
A rotation angle detection mechanism for detecting a rotation angle of the motor output shaft is provided between the motor output shaft of the electric motor and the cover member,
The rotation angle detection mechanism includes a cylindrical detected portion fixed to a tip portion of the motor output shaft on the cover member side, and is provided on the cover member, and a detection coil is arranged coaxially with the detected portion. And a valve timing control system for an internal combustion engine. The valve timing control system for an internal combustion engine according to any one of claims 1 to 6,
The valve timing control system for an internal combustion engine, wherein the second fixing member has a base portion of the seal member fixed to an inner peripheral surface of a second opening.

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