JP2009174411A - Valve timing control device of internal combustion engine and method of manufacturing rotation angle detection means used in the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve timing control device of an internal combustion engine capable of improving the detection accuracy of a rotation angle position of a camshaft, by attaching an object to be detected by a rotation angle detection means for detecting the rotation angle of the camshaft at a precise angle position. <P>SOLUTION: The valve timing control device of an internal combustion engine mainly includes the camshaft 3 having one end 3a inserted in a rotating body 2 that rotates synchronously with a crankshaft, a vane rotor 4 arranged between the rotating body 2 and the camshaft 3 so as to change a relative rotational phase of the rotating body 2 and the camshaft 3, a magnetic member 41 as the detected object that is attached to a projecting part 22 of the vane rotor 4 via a plate member 40, and a sensor section 42 for detecting the angle position of the magnetic member 41 to thereby detect the rotation angle of the camshaft 3. The magnetic member 41 is formed of synthetic resin in which magnetic powder is mixed. The magnetic member 41 is magnetized after it is attached to the projecting part 22 so that the magnetic pole is located at a predetermined position in the circumferential direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve timing control device for an internal combustion engine that changes a relative rotation phase between a crankshaft and a camshaft, and a method for manufacturing a rotation angle detection means that detects the rotation angle of the camshaft.

  As this type of conventional valve timing control device for an internal combustion engine, for example, the one described in Patent Document 1 below is known.

  In brief, a rotating body that rotates in synchronization with the crankshaft of an engine, and a cam that is inserted into the rotating body and that opens an engine valve against the spring force of a valve spring on the outer periphery. A camshaft, a vane rotor provided between the rotating body and one end of the camshaft to change a relative rotational phase of the rotating body and the camshaft by hydraulic drive, and a delay formed in the rotating body. A hydraulic circuit that rotationally drives the vane rotor by relatively supplying and discharging hydraulic pressure to the angle side hydraulic chamber and the advance side hydraulic chamber, and a cam that detects an angular position of a detected object attached to one end of the vane rotor Rotation angle detection means for detecting the rotation angle of the shaft.

  The rotating body is provided at one end of the camshaft and is connected to the crankshaft via a chain or the like, and is disposed on one end of the timing sprocket, and a plurality of partition walls are provided on the inner peripheral surface. It is composed of a projecting cylindrical housing and a front plate that closes the front end opening of the housing. The timing sprocket, the housing, and the front plate are integrally coupled from the axial direction by a plurality of bolts.

  The vane rotor includes a substantially cylindrical rotor portion fixed to one end portion of the camshaft by a bolt or the like, and a plurality of blade portions integrally provided so as to protrude radially on the outer peripheral surface of the rotor portion. It is mainly composed.

  The rotation angle detection means is composed of a sensor plate attached to an attachment part at the tip of the vane rotor, and a sensor part for detecting the angular position of the camshaft by detecting the angular position of the sensor plate. ing.

  The sensor plate includes an annular portion formed in an annular shape, and a detection target (target) integrally formed so as to protrude in a radial direction from an outer peripheral edge of the annular portion, and the annular portion is The vane rotor is fixed to the mounting portion by press-fitting. In addition, the said each to-be-detected body is provided with two or more by the predetermined position of the circumferential direction of the said annular part.

  The sensor section is disposed on the front end side of the sensor plate with a slight gap. In addition, a pulse signal is transmitted from the detection unit provided at the tip facing the sensor plate toward the detected body to detect the angular position of the detected body.

Then, when the camshaft rotates, the sensor detects the rotation angle of each detected object of the sensor plate, and detects the rotation angle of the crankshaft by another sensor. The controller detects the relative rotation angle of the camshaft with respect to the crankshaft.
JP 2003-106116 A (FIGS. 1 and 3)

  However, in the conventional valve timing control device, in order to detect the accurate angular position of each detected object by the detection unit of the sensor, each detected object of the sensor plate is placed at a predetermined position of the annular portion. It needs to be formed accurately.

  Further, even if each of the detected bodies is accurately formed at a predetermined position of the annular portion, the angular position of each of the detected bodies is slightly changed due to an attachment error that occurs when the sensor plate is attached to the attachment portion of the vane rotor. However, there is a risk of misalignment in the circumferential direction.

  Thereby, when the camshaft rotates, an error occurs between the rotation angle of each detected object detected by the sensor and the rotation angle of the camshaft.

  As a result, the detection accuracy for detecting the rotation angle of the camshaft may be reduced.

  The present invention has been made in view of the above-described conventional technical problems, and an object of the present invention is to improve the detection accuracy of the rotation angle of the camshaft by attaching the detected object to an accurate angular position of the vane rotor. It is said.

  The present invention has been devised in view of the above-described conventional situation, and the invention according to claim 1 is a camshaft having a rotating body that is driven to rotate by a crankshaft and a cam that opens and closes an engine valve on the outer periphery. A valve timing control device for an internal combustion engine that changes a relative rotation phase with respect to the camshaft, wherein a magnetic member that is a detected body of a rotation angle detection means that detects a rotation angle of the camshaft rotates integrally with the camshaft. In addition to being attached to the driven member, different magnetic poles of the magnetic member are positioned in the circumferential direction after being attached to the driven member.

  In the present invention, after the magnetic member is attached to the driven member, the different magnetic poles of the magnetic member are arranged at predetermined positions in accordance with the angular position of the camshaft. Can be made to coincide with the angular position.

  Accordingly, the occurrence of an error between the rotation angle of the magnetic member when the camshaft rotates and the rotation angle of the camshaft is prevented, and the detection accuracy of the rotation angle of the camshaft by the rotation angle detection means is improved. To do.

  Embodiments of a valve timing control device according to the present invention will be described below in detail with reference to the drawings. In this embodiment, the one applied to the intake valve side of an in-line four-cylinder or V-type eight-cylinder internal combustion engine is shown.

  That is, as shown in FIGS. 1 and 2, the valve timing control device 1 provided in the first embodiment includes a rotating body 2 that rotates in synchronization with a crankshaft (not shown), and a rotating body 2 in the rotating body 2. One end portion 3a is inserted, and a camshaft 3 having a cam that opens an intake valve as an engine valve against the spring force of a valve spring (not shown) on the outer periphery, and one end portion of the rotating body 2 and the camshaft 3 3a, a vane rotor 4 that is a driven member that changes the relative rotational phase of the rotating body 2 and the camshaft 3 by hydraulic drive, and a plurality of retardation sides formed in the rotating body 2 A hydraulic circuit 7 for rotating and driving the vane rotor 4 by relatively supplying and discharging hydraulic pressure to the hydraulic chamber 5 and the advance side hydraulic chamber 6, and a part of the hydraulic circuit 7 are attached to the vane rotor 4. Detecting rotation angle It includes a means 8.

  The rotating body 2 includes a disc-shaped timing sprocket 11 connected to the crankshaft via a chain (not shown) meshed with a plurality of teeth 11a formed on the outer periphery, and a front end face side of the timing sprocket 11 And a front plate 13 which is a disc-like lid that closes the front end opening of the housing 12.

  The timing sprocket 11 has a bearing hole 11b penetratingly formed in the inner peripheral portion thereof, and four relatively small female screw holes 11c are provided at approximately 90 ° in the circumferential direction on the outer peripheral side of the bearing hole 11b. It has been. In addition, a through hole 11d to which a hole constituting member 15 of the lock mechanism 14 described later is attached is formed at a predetermined position on the substantially same pitch circle as each of the female screw holes 11c.

  The housing 12 is provided with four partition wall portions 12a protruding substantially in a trapezoidal shape on the inner peripheral surface at predetermined positions in the circumferential direction. Each partition wall 12a is formed with a bolt hole 12b penetrating from the front plate 13 to the timing sprocket 11 in the axial direction at a position corresponding to each female screw hole 11c of the timing sprocket 11. Further, a groove 12c is formed in the axial direction on the inner peripheral surface of each partition wall portion 12a, and a seal member 17 that is in sliding contact with the outer peripheral surface of the rotor portion 16 described later of the vane rotor 4 is provided inside each groove 12c. It has been.

  The timing sprocket 11, the housing 12, and the front plate 13 are inserted into the bolt holes 12b from the holes 13a formed in the front plate 13, and are screwed into the female screw holes 11c. The bolts 18 are integrally connected from the axial direction.

  The camshaft 3 has a bolt female screw hole 3b into which the bolt 19 is screwed in the one end portion 3a in the axial direction, and the outer periphery of the one end portion 3a has a circumferential direction with respect to the vane rotor 4. Pin grooves 3c into which positioning pins 20 for positioning are inserted are formed along the radial direction.

  The vane rotor 4 is mainly composed of the rotor portion 16 formed in a substantially cylindrical shape and a plurality of blade portions 21 provided integrally on the outer peripheral surface of the rotor portion 16 so as to protrude in the radial direction. A cylindrical projecting portion 22 is integrally provided at one axial end portion 16 a of the rotor portion 16. A plate member 40 to be described later is attached to the outer periphery of the protruding portion 22. The other end portion 16b of the rotor portion 16 is integrally provided with a cylindrical attachment portion 23 into which the one end portion 3a of the camshaft 3 is fitted.

  The rotor portion 16 has an axial hole 25 formed in a substantially cylindrical shape in the central internal axial direction, and a bolt into which the bolt 19 is inserted in the center of the bottom 26 of the axial hole 25. An insertion hole 26 a is formed and is coupled to the camshaft 3 from the axial direction via the bolt 19.

  In addition, the rotor portion 16 is formed through the inner peripheral surface of the axial hole 25 on the bottom portion 26 side to the outer peripheral surface of the rotor portion 16, and communicates with the respective retard side hydraulic chambers 5. One communication hole 27 and four second communication holes which are formed through the outer peripheral surface of the rotor portion 16 from the inner peripheral surface of the axial hole 25 on the projecting portion 22 side and communicate with each advance side hydraulic chamber 6. 28 is formed.

  Furthermore, a passage constituting member 30 described later is fitted and held in the axial hole 25.

  Four blade portions 21 are provided at predetermined positions in the circumferential direction of the rotor portion 16, and a groove 21 a is axially provided from the front plate 13 toward the timing sprocket 11 at the tip of each blade portion 21. The seal member 24 is provided in the groove 21a so as to be in sliding contact with the inner peripheral surface of the housing 12. Further, in one of the blade portions 21, a sliding hole 20b that constitutes a part of the lock mechanism 14 described later is formed so as to penetrate in the axial direction.

  The protruding portion 22 is formed in a substantially cylindrical shape extending in the axial direction from the one end portion 16 a of the rotor portion 16, and has an inner diameter that is substantially the same as the inner diameter of the axial hole 25. Part of.

  The attachment portion 23 is formed in a substantially cylindrical shape in the axial direction from the other end portion 16b, and a fitting groove 23a having a diameter slightly larger than the outer diameter of the camshaft 3 is formed along the axial direction on the inner periphery. In addition, a pin insertion groove 23b is formed penetratingly formed along the radial direction at a tip position corresponding to the pin groove 3c of the camshaft 3. The timing sprocket 11 is supported on the outer periphery of the mounting portion 23 so as to be relatively rotatable.

  Further, when the vane rotor 4 is accommodated in the housing 12, the blade portions 21 are disposed between the partition walls 12 a of the housing 12, so that the blade portions 21 and the partition walls are arranged. The retard side hydraulic chamber 5 and the advance side hydraulic chamber 6 are separated from each other by 12a. At this time, the first communication holes 27 communicate with the retard angle hydraulic chambers 5, and the second communication holes 28 communicate with the advance angle hydraulic chambers 6.

  The lock mechanism 14 includes a bottomed cylindrical lock pin 31 slidably provided in the sliding hole 20b of the vane rotor 4, and a shaft portion 32a disposed in the lock pin 31. A head portion 32b formed integrally with the portion 32a is provided between the retainer 32 that contacts the end surface of the front plate 13 on the housing 12 side, and between the retainer 32 and the lock pin 31, and the lock pin 31 is The hole constituting member 15 having a return spring 33 that is biased toward the timing sprocket 11 and a lock hole 15a that is provided in the through hole 11d of the timing sprocket 11 and into which the tip 31a of the lock pin 31 is inserted. It consists of and.

  The lock pin 31 is fixed to the timing sprocket 11 by being inserted into the lock hole 15a by the spring force of the return spring 33 when the vane rotor 4 is positioned at the most retarded angle side. It becomes.

  The vane rotor 4 is moved in the axial direction toward the front plate 13 against the spring force of the return spring 33 when the hydraulic pressure is supplied to the advance side hydraulic chambers 6. Thus, the distal end portion 31a is released from the lock hole 15a and the lock is released.

  The hydraulic circuit 7 is connected to an electromagnetic switching valve that is operated by a controller (not shown), and supplies and discharges hydraulic oil to and from each retarded-side hydraulic chamber 5 through an oil passage 29 and the passage constituting member 30. There are two hydraulic passages, one hydraulic passage and a second hydraulic passage (not shown) for supplying and discharging hydraulic oil to and from each of the advance side hydraulic chambers 6. The first and second hydraulic passages are connected to a supply passage through which hydraulic oil is supplied from an oil pump (not shown) via the electromagnetic switching valve and a drain passage for discharging the hydraulic oil to an oil pan (not shown). .

  The passage component member 30 is formed in a substantially cylindrical shape, and communicates with the first hydraulic passage therein to supply and discharge hydraulic pressure to and from each retarded-side hydraulic chamber 5 and the second hydraulic passage. And a second passage portion 35 for supplying and discharging hydraulic pressure to and from each advance side hydraulic chamber 6 is formed. An annular communication groove 36 that communicates with the second passage portion 35 is formed on the outer periphery of the passage constituting member 30.

  In addition, a space portion 37 that communicates with each of the first communication holes 27 is formed between the distal end of the passage constituting member 30 and the bottom portion 26 of the axial hole 25, and the communication groove 36 includes the communication grooves 36. It communicates with the second communication hole 28.

  The first passage portion 34 is formed in the passage component member 30 along the axial direction toward the distal end side of the passage component member 30, and an end portion located on the distal end side communicates with the space portion 37. ing.

  The second passage portion 35 is formed in the axial direction inside the passage constituting member 30 so as to be substantially parallel to the first passage portion 34, and an end portion located on a distal end side of the passage constituting member 30 is It communicates with the communication groove 36. An annular seal member 39 that partitions the communication groove 36 and the space 37 is provided in three outer peripheral grooves 38 formed on the outer periphery of the passage constituting member 30.

  The rotation angle detecting means 8 is fixed to the protruding portion 22 of the vane rotor 4 via the plate member 40, and a magnetic member 41 that is a detected body that rotates integrally with the vane rotor 4, and the magnetic member 41. And a sensor unit 42 for detecting the rotational position.

  The plate member 40 is formed in a substantially disc shape whose inner peripheral side is thick, and is fixed to the outer peripheral surface of the protruding portion 22 by press-fitting through an attachment hole 40a formed at a substantially central position in the radial direction. Yes.

  As shown in FIGS. 1 and 3, the magnetic member 41 covers the outer peripheral edge of the plate member 40 with a synthetic resin material mixed with magnetic powder capable of forming a magnetic pole such as a ferrite magnet later. It is formed in an annular shape with a substantially U-shaped cross section, is provided on the outer peripheral side of the plate member 40, and is continuously formed on the outer peripheral side of the one end 41a, and one end 41a facing the sensor unit 42. The peripheral wall 41b is located on the outer peripheral edge of the plate member 40, and the other end 41c is formed continuously from the peripheral wall 41b and provided on the rear end surface side of the plate member 40. . The magnetic member 41 is formed such that the one end 41a is longer inward in the radial direction than the other end 41c, and when attached to the plate member 40, no magnetic pole is formed. By magnetizing the magnetic member 41 with a magnetizing yoke (not shown) for forming the magnetic pole, different magnetic poles are formed on the magnetic member 41.

  That is, the magnetic powder is mixed into the synthetic resin material constituting the magnetic member 41, and the synthetic resin material is softened by applying heat, and is brought into contact with the outer peripheral edge of the plate member 40 so that the cross-section is substantially co-axial. The magnetic member 41 is attached and fixed to the plate member 40 by being formed into a letter shape and cured.

  Next, the magnetic member 41 is attached to the protrusion 22 by press-fitting the plate member 40 to which the magnetic member 41 is attached into the protrusion 22 through the attachment hole 40a.

  Then, the magnetic member 41 is magnetized by the magnetizing yoke or the like in accordance with the reference position, with the angular position of the camshaft 3 when the vane rotor 4 is positioned on the most retarded side as the reference position. Magnetic poles are formed on the member 41 to form permanent magnets. For example, as shown in FIG. 3, S poles and N poles are alternately arranged at predetermined angular positions in the circumferential direction. This magnetic pole is formed in the axial direction over the whole from the one end 41a of the magnetic member 41 to the other end 41c through the peripheral wall 41b.

  The sensor part 42 is a sensor in which a magnetoresistive element 42a for detecting a change in magnetic flux, for example, is provided at the tip part. It arrange | positions at the front-end surface side of the said plate member 40 so that it may oppose.

  Then, the rotation angle when the magnetic member 41 is rotated by the sensor unit 42 is detected, the rotation angle of the crankshaft is detected by another sensor or the like, and the relative rotation of the camshaft 3 is detected by these detected values. The dynamic phase is specified.

  Next, the relative rotation of the vane rotor 4 with respect to the timing sprocket 11 during engine operation will be described.

  First, at the time of engine start and idling operation, the electromagnetic switching valve is operated by a control signal from the controller to connect the supply passage and the first hydraulic passage, and the drain passage and the second hydraulic passage. Communicate with communication. For this reason, the hydraulic oil pumped from the pump flows from the first hydraulic passage through the first passage portion 34 into the first communication hole 27 through the space portion 37, and the first communication hole 27. Are supplied to the respective retarding side hydraulic chambers 5, while the hydraulic pressure chambers 6 are kept in a low pressure state without being supplied with hydraulic oil as in the case of the engine stop.

  At this time, as shown in FIG. 2, the vane rotor 4 is in a state where each blade portion 21 is in contact with one side surface of each partition wall portion 12 a on the advance side hydraulic chamber 6 side and located on the most retarded side. The vane rotor 4 is fixed to the timing sprocket 11 by a lock mechanism 14.

  Thereafter, when the vehicle starts and the engine shifts from a low rotation / low load range to a normal operation in the middle rotation / middle load range, the electromagnetic switching valve is actuated by a control signal from the controller, and the supply passage and the second In addition to communicating with the hydraulic passage, the drain passage and the first hydraulic passage are communicated with each other. For this reason, the hydraulic oil pressure-fed from the oil pump flows from the second hydraulic passage through the second passage portion 35 into the second communication hole 28 via the communication groove 36, and this second communication hole 28. The hydraulic oil is supplied into each advance angle hydraulic chamber 6 from the above, and the inside of each advance angle hydraulic chamber 6 becomes high pressure.

  On the other hand, the hydraulic oil is not supplied into each retard angle hydraulic chamber 5, and the hydraulic oil in each retard angle hydraulic chamber 5 flows from the first communication hole 27 through the space 37 to the first passage portion. 34, flows from the first passage portion 34 through the first hydraulic passage, and is discharged from the drain passage to the oil pan, so that the inside of each retarded-side hydraulic chamber 5 becomes low pressure. At this time, the state in which the vane rotor 4 is fixed to the timing sprocket 11 by the lock mechanism 14 is released, and the vane rotor 4 moves clockwise from the position shown in FIG. It moves to the other side of each partition part 12a.

  Further, when the engine shifts from the middle rotation middle load region to the high rotation high load region, the amount of hydraulic oil supplied from the pump into each advance side hydraulic chamber 6 further increases. On the other hand, the hydraulic oil in each retarded-side hydraulic chamber 5 is discharged to the oil pan in accordance with an increase in the amount of hydraulic oil supplied to each advanced-angle hydraulic chamber 6. For this reason, in the vane rotor 4, each blade portion 21 further moves in the clockwise direction, contacts the other side surface of each partition wall portion 12a on the retard side hydraulic chamber 5 side, and moves to the most advanced angle side.

  In this embodiment, as described above, since the plate member 40 to which the magnetic member 41 is attached is attached to the protruding portion 22 of the vane rotor 4, the magnetic member 41 is formed with magnetic poles. The magnetic poles can be arranged at an accurate angular position of the magnetic member 41 without being affected by an attachment error when attaching 40 to the vane rotor 4.

  Therefore, the rotation angle position of the camshaft 3 and the rotation angle position of the magnetic pole of the magnetic member 41 coincide with each other, and the camshaft 3 and the magnetic member when the camshaft 3 rotates relative to the rotating body 2. The positional deviation from the rotation angle of the magnetic pole 41 is prevented, and the detection accuracy of the rotation angle of the camshaft 3 by the sensor unit 42 is improved.

  In addition, since the magnetic pole is formed not only at one end 41 a of the magnetic member 41 but also from the peripheral wall portion 41 b to the other end portion 41 c, there is a space for arranging the sensor portion 42 on the front end face side of the plate member 40. In the case where there is no sensor member 42, it is possible to dispose the sensor part 42 on the outer side in the radial direction of the plate member 40, which is a position facing the peripheral wall part 41b of the magnetic member 41.

  Further, since the magnetic member 41 is attached to the protruding portion 22 via the plate member 40, the magnetic member 41 is disposed at a position away from each advance side hydraulic chamber 6 and each retard side hydraulic chamber 5. Has been. That is, the magnetic force of the magnetic member 41 does not easily reach the advance angle hydraulic chambers 6 and the retard angle hydraulic chambers 5, so that the advance angle hydraulic chambers 6 and the retard angle hydraulic chambers 5 Even if there is contamination such as metal powder, the contamination is prevented from concentrating inside each advance-side hydraulic chamber 6 and each retard-side hydraulic chamber 5 on the plate member 40 side.

  FIG. 4 shows a second embodiment of the present invention. The basic configuration is substantially the same as that of the first embodiment, except that a magnetic member 41 is provided at the tip of the protruding portion 22. . For this reason, the protrusion 22 is not provided with a plate member 40.

  Also, the passage constituting member 30 is not provided in the axial hole 25 of the vane rotor 4, and an oil passage (not shown) is formed on the camshaft 3 side. The hydraulic oil is supplied to and discharged from the corner-side hydraulic chamber 6 and each retard-side hydraulic chamber 5.

  Further, a step-like circumferential groove 43 that is a groove is formed on the outer periphery of the tip of the protrusion 22 over almost the entire circumference, and the magnetic member 41 is directly attached to the circumferential groove 43. .

  The magnetic member 41 is formed in an annular shape having a substantially U-shaped cross section that opens radially inward, and has an outer diameter that is substantially the same as the outer diameter of the protruding portion 22. The magnetic member 41 has one end 41a disposed at the tip of the protruding portion 22 so that the inner diameter is substantially the same as the inner diameter of the axial hole 25, and the one end 41a extends from the front plate. A peripheral wall portion 41b is integrally formed in the axial direction toward the 13th side. The other end portion 41 c formed integrally with the end portion of the peripheral wall portion 41 b is fitted in the circumferential groove portion 43. The method for attaching the magnetic member 41 to the circumferential groove 43 and the method for forming a magnetic pole on the magnetic member 41 are the same as in the first embodiment described above.

  Therefore, a magnetic pole can be formed on the magnetic member 41 in accordance with the angular position of the camshaft 3, and the magnetic member 41 is firmly attached with the other end 41 c fitted into the circumferential groove 43. Therefore, it is possible to prevent the magnetic poles positioned and formed after the attachment from being displaced in the circumferential direction and the magnetic member 41 from being removed from the circumferential groove 43. The effect of preventing the magnetic member 41 from being displaced in the circumferential direction or coming off from the circumferential groove 43 is also effective when the vane rotor 4 is formed of sintered metal or the like.

  In addition, since the protruding member 22 is not provided with the plate member 40, a space in which the sensor unit 42 can be disposed on the outer peripheral side of the protruding portion 22 is generated. Furthermore, since the magnetic member 41 is formed with a magnetic pole in the axial direction from the one end portion 41a through the peripheral wall portion 41b to the other end portion 41c, the sensor portion 42 is arranged at one end portion of the magnetic member 41 according to the space. It can arrange | position not only on the 41a side but on the radial direction outer side of the surrounding wall part 41b.

  Furthermore, since the magnetic member 41 is directly attached to the vane rotor 4 without using the plate member 40, the number of parts can be reduced and the magnetic member 41 can be reduced in diameter.

  FIG. 5 shows a third embodiment of the present invention, in which a magnetic member 41 is provided on the inner periphery of the one end portion 16a of the rotor portion 16. Further, an inner circumferential groove 44 as a groove is formed in the circumferential direction on the inner circumferential surface of the one end portion 16a of the rotor portion 16, and the inner circumferential surface of the inner circumferential groove 44 protrudes radially inward. The inner peripheral convex portion 44a is integrally formed. Note that the protruding portion 22 is not formed at one end portion 16 a of the rotor portion 16.

  The magnetic member 41 is directly attached to the inner circumferential groove 44.

  The magnetic member 41 is formed in an annular shape having a substantially U-shaped cross section that opens radially outward, and has an inner diameter that is substantially the same as the inner diameter of the axial hole 25. In addition, the magnetic member 41 is provided with one end 41a at the end of the inner peripheral groove 44 on the front plate 13 side, and is continuous with the one end 41a on the inner peripheral side of the inner peripheral convex portion 44a. The peripheral wall portion 41b is integrally formed. The other end portion 41c formed integrally with the peripheral wall portion 41b is fitted between the axial hole 25 and the inner peripheral convex portion 44a.

  Since the vane rotor 4 is not formed with the projecting portion 22, the axial length of the entire vane rotor 4 is shortened, and the sensor portion 42 is disposed on the one end 41 a side of the magnetic member 41. A relatively large space is formed.

  The present invention is not limited to the configuration of the previous embodiment. For example, the magnetic member 41 is formed by a plurality of permanent magnets in which different magnetic poles are formed in advance, and the plate member 40 is attached to the vane rotor 4. The magnetic poles of the permanent magnets can be arranged at predetermined positions on the plate member 40 in accordance with the reference position of the camshaft 3.

  It is also possible to provide the valve timing control device 1 on the exhaust valve side of the internal combustion engine.

  Further, the rotation angle detecting means 8 can be used in an electromagnetic type valve timing control device.

It is a longitudinal cross-sectional view of the valve timing control apparatus provided for this invention. It is a cross-sectional view of the valve timing control device of this embodiment. It is a whole figure of the to-be-detected body of the rotation angle detection means of this embodiment. It is a longitudinal cross-sectional view of the valve timing control apparatus which shows the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the valve timing control apparatus which shows the 3rd Embodiment of this invention.

Explanation of symbols

2 ... Rotating body 3 ... Camshaft 4 ... Vane rotor (driven member)
DESCRIPTION OF SYMBOLS 5 ... Delay angle side hydraulic chamber 6 ... Advance angle side hydraulic chamber 8 ... Rotation angle detection means 11 ... Timing sprocket 12 ... Housing 13 ... Front plate 14 ... Lock mechanism 40 ... Plate member 41 ... Magnetic member 42 ... Sensor part

Claims (6)

A valve timing control device for an internal combustion engine that changes a relative rotation phase between a rotating body that is rotationally driven by a crankshaft and a camshaft having a cam that opens and closes an engine valve on an outer periphery,
A magnetic member that is to be detected by a rotation angle detecting means for detecting a rotation angle of the camshaft is attached to a driven member that rotates integrally with the camshaft, and after being attached to the driven member, the magnetic member is different. A valve timing control device for an internal combustion engine, wherein magnetic poles are positioned in a circumferential direction. 2. The valve timing control device for an internal combustion engine according to claim 1, wherein a projecting portion projecting in a radial direction is provided at one end portion of the driven member, and the magnetic member is attached to the projecting portion. The valve timing control device for an internal combustion engine according to claim 1, wherein a groove is formed in the driven member, and the magnetic member is attached to the groove. The valve timing control device for an internal combustion engine according to claim 2, wherein a groove is formed in the projecting portion, and the magnetic member is attached to the groove. The valve timing control device for an internal combustion engine according to any one of claims 1 to 4, wherein the magnetic member is made of a synthetic resin material mixed with magnetic powder. A valve timing control device for an internal combustion engine that changes a relative rotation phase between a rotating body that is rotationally driven by a crankshaft and a camshaft having a cam that opens and closes an engine valve on an outer periphery,
A magnetic member to be detected by a rotation angle detecting means for detecting the rotation angle of the camshaft is formed of a synthetic resin material mixed with magnetic powder, and the synthetic resin material is rotated integrally with the camshaft. A method of manufacturing a rotation angle detection means used in a valve timing control device for an internal combustion engine, wherein different magnetic poles are formed in the synthetic resin material while being circumferentially positioned after being attached to a driven member.

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