JP2020045886A - Valve timing adjustment device - Google Patents

Abstract

To provide a valve timing adjustment device capable of connecting a phase adjustment part and a motor even if the relative position and relative angle between the fixed member to which the motor is fixed and a phase adjustment part are shifted from the ideal relative position and relative angle due to the accumulated tolerance.SOLUTION: A valve timing adjustment device 100 comprises: a motor 4 that outputs a control torque by rotating a rotor 41 disposed outside the stator 44; a phase adjustment part 3 that adjusts the rotation phase between a crankshaft and a camshaft 1 according to the rotation state of an input rotator 32 that is rotated by the control torque output by the motor 4; and a joint part 5 for connecting the stator 44 and the specified place of an internal combustion engine. The joint part 5 includes: a rotation rest mechanism in a rotation direction of a rotation axis of the rotor 41 that stops the stator 44 with respect to the internal combustion engine; and a movement adjustment mechanism that increases the amount by which the stator 44 can move with respect to the internal combustion engine, more than the amount by which the rotor 41 can move with respect to the phase adjustment unit 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve timing adjusting device.

  By controlling the rotation of the motor in accordance with the rotation speed of the engine crankshaft, the timing of opening and closing the intake valve or exhaust valve of the engine is controlled by shifting the rotation phase of the crankshaft and the rotation phase of the camshaft. Valve timing adjustment devices are known.

  For example, in Patent Literature 1, an assembling angle operation mechanism for changing an assembling angle (rotation phase) between a drive rotating member on a crankshaft side and a driven shaft member on a camshaft side is interposed. The assembly angle is controlled by a motor via an intermediate rotating member and a planetary gear. The motor is composed of a field rotor, an electromagnetic rotor, and a stator coil, and controls an AC current flowing through the stator coil to control the field rotor. By changing the rotation speed and the rotation direction of both the electromagnetic rotor and the electromagnetic rotor, the rotation of the electromagnetic rotor controls the planetary gears, drives the intermediate rotating member with a small force, and operates a variable valve system in which each of the operating mechanisms is operated. It has been disclosed.

JP 2007-177628 A

  The valve timing adjustment device connects a phase adjustment unit that changes a rotation phase of a cam shaft that opens and closes an intake valve or an exhaust valve of an engine, and a motor that outputs a control torque to the phase adjustment unit. However, in the related art, the relative position and angle between the fixed member to which the motor is fixed and the phase adjustment unit are determined based on the assembly tolerance of the camshaft and the case, and the accumulated tolerance due to the component tolerance of each part. In some cases, the position and the reference angle are displaced, and the phase adjustment unit fixed to the camshaft cannot be connected to the motor fixed to a fixing member such as a case for housing the engine.

  The present invention has been made to solve the above problems, and the relative position and relative angle between a fixing member to which a motor is fixed and a phase adjustment unit are ideal due to accumulated tolerances such as assembly tolerance and component tolerance. It is an object of the present invention to provide a valve timing adjustment device that can connect a phase adjustment unit and a motor even when a deviation occurs from a relative position and relative angle.

  A valve timing adjusting device according to the present invention is a valve timing adjusting device that adjusts a valve timing of a valve that opens and closes a camshaft by transmitting crank torque from a crankshaft in an internal combustion engine, and is arranged outside a stator. It has a motor that outputs control torque by rotating the rotor, and an input rotor that rotates by the control torque output by the motor, and adjusts the rotation phase between the crankshaft and the camshaft according to the rotation state of the input rotor. And a joint for connecting the stator and a predetermined portion of the internal combustion engine, wherein the joint is configured to stop the starter with respect to the internal combustion engine in the rotation direction of the rotation shaft on which the rotor rotates. Stationary mechanism and movement that makes the amount of movement of the stator relative to the internal combustion engine larger than the amount of movement of the rotor with respect to the phase adjustment unit And settling mechanism, and has a.

  According to the present invention, the relative position and the relative angle between the fixing member to which the motor is fixed and the phase adjustment unit are changed with respect to the ideal relative position and the relative angle by the accumulated tolerance such as the assembly tolerance and the component tolerance. Even if a shift occurs, the phase adjustment unit and the motor can be connected.

FIG. 1 is an exploded perspective view of the valve timing adjustment device according to the first embodiment. FIG. 2 is a cross-sectional view in a state where the valve timing adjustment device according to Embodiment 1 is mounted in an engine room. FIG. 3 is an exploded perspective view of a phase adjustment unit in the valve timing adjustment device according to the first embodiment. FIG. 4 is a cross-sectional view of the valve timing adjustment device according to Embodiment 1 in a state before the phase adjustment unit and the motor are connected. FIG. 5 is a perspective view in a state where the first movable fixing member and the second movable fixing member according to Embodiment 1 are installed in the joint portion. FIG. 6A is a diagram illustrating an installation state of the first movable fixed member and the second movable fixed member when the actual relative position and the actual relative angle do not deviate from the reference position and the reference angle. FIG. 6B is a diagram illustrating an installation state of the first movable fixing member and the second movable fixing member when the actual relative angle is shifted from the reference angle. FIG. 6C is a diagram illustrating an installation state of the first movable fixed member and the second movable fixed member when the actual relative position is shifted from the reference position in the radial direction of the rotation axis of the rotor. FIG. 6D is a diagram illustrating an installation state of the first movable fixed member and the second movable fixed member when the actual relative position is shifted from the reference position in the axial direction of the rotation axis of the rotor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
The valve timing adjusting device 100 according to Embodiment 1 will be described below.

FIG. 1 is an exploded perspective view of the valve timing adjustment device 100 according to the first embodiment.
FIG. 2 is a cross-sectional view in a state where the valve timing adjustment device 100 according to Embodiment 1 is mounted in an engine room.
The configuration of the valve timing adjustment device 100 according to the first embodiment will be described with reference to FIGS.

The valve timing adjusting device 100 is fixed to the camshaft 1 by a fixing screw 2.
Further, the valve timing adjustment device 100 is connected to an engine case 8 that houses an engine via a control box 6 that houses a control board (not shown) for controlling the motor 4. The motor 4 will be described later.

The valve timing adjustment device 100 is an internal combustion engine by transmitting a crank torque obtained from a crankshaft (not shown) via a chain 7 to the camshaft 1 via a phase adjustment unit 3 and outputting it as a rotational torque. It opens and closes an intake valve (not shown) or an exhaust valve (not shown) of an engine (not shown). The mechanism by which the camshaft 1 opens and closes the intake valve or the exhaust valve of the engine is a well-known technique, and thus the description thereof is omitted.
Further, the valve timing adjustment device 100 adjusts the rotation phase of the crankshaft and the rotation phase of the camshaft 1 by using a control torque acquired from the motor 4 described later, thereby adjusting the timing of opening and closing the intake valve or the exhaust valve. It is to adjust.

  The valve timing adjustment device 100 includes a phase adjustment unit 3, a motor 4, and a joint unit 5.

The phase adjuster 3 adjusts the rotational phase between the crankshaft and the camshaft 1 and outputs a rotational torque to the camshaft 1.
FIG. 3 is an exploded perspective view of the phase adjustment unit 3 in the valve timing adjustment device 100 according to the first embodiment.
The configuration of the phase adjustment unit 3 in the valve timing adjustment device 100 according to Embodiment 1 will be described with reference to FIG.

  As an example, the phase adjusting unit 3 includes a sprocket 31, an input rotating body 32, an output unit 34, bearings 35a, 35b, 35c, 35d, a pinion 36, an input unit 37, a holding cover 38, and a cover screw 39.

  The sprocket 31 is a gear that is connected to the chain 7 connected to the crankshaft and rotates in the rotation direction of the camshaft 1 in conjunction with the rotation of the crankshaft.

  The holding lid 38 is a member that becomes a part of the case of the phase adjustment unit 3, is fixed to the sprocket 31 by a lid screw 39, and rotates in conjunction with the rotation of the sprocket 31.

  The input section 37 is a gear having internal teeth 37 a, and is fixed to the holding lid 38 by, for example, being pressed into the inside of the holding lid 38. That is, since the input unit 37 is fixed to the sprocket 31 via the holding lid 38, the input unit 37 rotates in conjunction with the rotation of the sprocket 31.

The input rotator 32 is a cylindrical member having internal teeth 32a, and the internal teeth are connected to a motor 4 described later, so that the input rotator 32 rotates in conjunction with the rotation of the motor 4 by the control torque obtained from the motor 4. I do. Part of the outer peripheral surface of the cylindrical input rotating body 32 abuts on the inner peripheral surface of each of the bearings 35b and 35c. The center axis of the outer peripheral surface of the cylindrical input rotating body 32 with which the bearings 35b and 35c abut is eccentric with respect to the rotating axis of the input rotating body 32.
That is, the input rotator 32 rotates about the center of the rotation axis of the input rotator 32, and the central axis of the outer peripheral surface of the cylindrical input rotator 32 with which the bearings 35 b and 35 c abut is determined by the rotation of the input rotator 32. Rotate around an axis in a circle.

  The output unit 34 is a gear having internal teeth 34a connected to second external teeth 36b of the pinion 36 described later. The output section 34 is fixed to the camshaft 1 by the fixing screw 2. The rotation axis of the output section 34 and the rotation axis of the camshaft 1 are on the same axis, and the rotation of the output section 34 outputs a rotational torque to the camshaft 1 to rotate the camshaft 1.

  The pinion 36 is a gear having both first external teeth 36 a connected to the internal teeth 37 a of the input unit 37 and second external teeth 36 b connected to the internal teeth 34 a of the output unit 34. The number of first external teeth 36a of the pinion 36 is different from the number of second external teeth 36b.

The bearing 35a is a bear rig installed between the input rotating body 32 and the output unit 34.
The bearing 35d is a bear rig installed between the input rotating body 32 and the holding lid 38.

  With the above configuration, the phase adjustment unit 3 rotates the sprocket 31 by the crank torque obtained from the crankshaft, rotates the input unit 37 by rotating the sprocket 31, and rotates the pinion 36 by rotating the input unit 37. The output section 34 is rotated by rotating the pinion 36. In the first embodiment, since the sprocket 31, the input unit 37, the input rotating body 32, the output unit 34, and the rotating shaft of the camshaft 1 are the same rotating shaft, the rotating shaft is hereinafter referred to as the phase adjusting unit 3. The axis of rotation.

The center axis of the outer peripheral surface of the input rotator 32 where the bearings 35b and 35c abut is the rotation axis of the input rotator 32. More specifically, it is eccentric with respect to the rotation axis of the phase adjustment unit 3. The inner peripheral surface of the pinion 36 contacts the outer peripheral surface of each of the bearings 35b and 35c. Therefore, the center axis of the pinion 36 is eccentric with respect to the rotation axis of the phase adjustment unit 3.
The pinion 36 is rotated via the input rotating body 32 by a control torque obtained from the motor 4 described later. In the phase adjusting unit 3, the first external teeth 36 a and the second external teeth 36 b of the pinion 36 have different numbers of teeth, and the center axis of the pinion 36 is biased with respect to the rotation axis of the phase adjusting unit 3. By adjusting the rotational speed of the motor 4, the rotational phase of the camshaft 1 with respect to the rotational phase of the crankshaft can be adjusted. The mechanism by which the phase adjuster 3 adjusts the rotation phase of the camshaft 1 with respect to the rotation phase of the crankshaft is a well-known technique, and thus the description is omitted.

The motor 4 outputs a control torque by rotating the rotor 41 disposed outside the stator 44.
The configuration of the motor 4 in the valve timing adjustment device 100 according to the first embodiment will be described with reference to FIGS.

  The motor 4 includes a rotor 41, a magnet 42, a coil 43, a stator 44, and bearings 45a and 45b.

  The stator 44 is, for example, a cylindrical member connected to the joint portion 5 described below.

  The coil 43 is fixed on the outer peripheral surface of a cylindrical stator 44, and generates a magnetic field by a current output from a control board for controlling the motor 4 housed in the control box 6.

  The rotor 41 is a cylindrical member provided at a position radially away from the outer peripheral surface of the cylindrical stator 44 so as to surround the outer peripheral surface of the stator 44.

  The magnet 42 is fixed on the inner peripheral surface of the cylindrical rotor 41.

  The bearings 45a and 45b are bearings installed between the rotor 41 and the stator 44.

  The motor 4 is a so-called outer rotor type motor that rotates the rotor 41 outside the stator 44 when the coil 43 is energized.

  The rotor 41 has external teeth 41 a on the outer peripheral surface of the rotor 41, and the external teeth 41 a of the rotor 41 are connected to the internal teeth 32 a of the input rotating body 32. That is, when the coil 43 is energized, the rotor 41 rotates, and the input rotator 32 rotates in conjunction with the rotation of the rotor 41.

The joint portion 5 is a member for connecting the stator 44 and a predetermined portion of the engine.
More specifically, for example, the joint portion 5 is a member for connecting the stator 44 to a predetermined location in a case or the like that houses the engine. In the first embodiment, the joint portion 5 is connected to a control box 6 fixed to an engine case 8 that houses the engine. That is, in the first embodiment, the joint portion 5 connects the stator 44 to a predetermined portion of the engine via the control box 6 fixed to the engine case 8 that houses the engine.
The joint portion 5 is located at a position parallel to the axial direction of the rotation axis of the rotor 41 (hereinafter referred to as “rotation axis of the rotor 41”) and radially inside the rotation axis of the rotation axis of the stator 44. Be placed. Here, the term “parallel” is not strictly parallel, but may be substantially parallel.

The configuration of the joint 5 in the valve timing adjustment device 100 according to the first embodiment will be described with reference to FIGS. 1 and 2.
The joint part 5 includes a first movable fixing member 51, an elastic member 52, a shaft core 53, and a second movable fixing member.

The first movable fixing member 51 is fixed to the stator 44.
More specifically, for example, the first movable fixing member 51 has a through hole that penetrates in the axial direction of the rotation axis of the rotor 41, and a stator in a state where a shaft core 53 described later is inserted into the through hole. 44 fixed.
Details of the first movable fixing member 51 will be described later.

The second movable fixing member 54 is fixed to a predetermined portion of the engine.
More specifically, for example, the second movable fixing member 54 has a through hole that penetrates in the axial direction of the rotation axis of the rotor 41, and a shaft core 53 described later is inserted into the through hole. It is fixed to an engine case 8 that houses the engine via a control box 6 that houses a control board for controlling the motor 4.
Details of the second movable fixing member 54 will be described later.

The elastic member 52 is, for example, a coil spring.
One end of the elastic member 52 is fixed to the first movable fixing member 51, and the other end facing the one end is fixed to the second movable fixing member 54.
More specifically, for example, one end of the elastic member 52 has a first movable fixing member 51 in a state where a shaft core 53 described later is inserted so that a core rod is inserted into a metal formed into a coil shape. And the other end opposite to the one end is fixed to the second movable fixing member 54.
The elastic member 52 is deformable in the rotation direction, the radial direction, and the axial direction of the rotation shaft of the rotor 41.

  The valve timing adjusting device 100 is configured such that the one end is fixed to the first movable fixing member 51, and the other end opposite to the one end is fixed to the second movable fixing member 54 by the elastic force of the elastic member 52. In the axial direction, the relative position between the motor 4 and the phase adjustment unit 3 can be maintained.

  The shaft core 53 is a rod-shaped member that is inserted into both the through hole of the first movable fixing member 51 and the through hole of the second movable fixing member 54. More specifically, for example, the shaft core portion 53 has a first falling prevention portion 53a larger than the diameter of the through hole of the first movable fixing member 51 at one end on the first movable fixing member side, and faces one end. At the other end on the second movable fixing member side, there is a second drop prevention portion 53b larger than the diameter of the through hole of the second movable fixing member 54, and the through hole of the first movable fixing member 51 and the second movable fixing member 54 It is installed in the valve timing adjustment device 100 in a state of being inserted into both of the through holes.

  The valve timing adjusting device 100 is configured such that the shaft core portion 53 has a first falling prevention portion 53a at one end and a second falling prevention portion 53b at the other end, so that the maximum distance between the motor 4 and the phase adjustment portion 3 can be improved. The distance can be regulated.

With reference to FIG. 4, an assembling procedure of the valve timing adjusting device 100 will be described.
FIG. 4 is a cross-sectional view of the valve timing adjustment device 100 according to Embodiment 1 in a state before the phase adjustment unit 3 and the motor 4 are connected.

First, the phase adjustment unit 3 and the motor 4 are assembled, and the motor 4 and the control box 6 are connected by the joint unit 5.
Next, the phase adjustment unit 3 is fixed to the camshaft 1 by fastening the output unit 34 of the phase adjustment unit 3 to the camshaft 1 with the fixing screw 2.
Next, the chain 7 is attached to the sprocket 31 of the phase adjustment unit 3.
FIG. 4 shows a state in which the above procedure has been performed.

From the state shown in FIG. 4, the motor 4 connected to the control box 6 is assembled to the phase adjustment unit 3.
Finally, the control box 6 and the engine case 8 are fixed with screws (not shown) or the like.

With reference to FIG. 5, the details of the first movable fixing member 51 and the second movable fixing member 54 will be described.
FIG. 5 is a perspective view in a state where the first movable fixing member 51 and the second movable fixing member 54 according to the first embodiment are installed in the joint portion 5.

The first moving and fixing member 51 has a convex portion 51 e extending toward the second moving and fixing member 54 on the first surface 51 a facing the second moving and fixing member 54.
The second movable fixing member 54 has a convex portion 54 e extending toward the first movable fixing member 51 on a first surface 54 a facing the first movable fixing member 51.
The convex portion 51e of the first movable fixing member 51 has a second surface 51b facing the first surface 54a of the second movable fixing member 54.
The protrusion 54 e of the second movable fixing member 54 has a second surface 54 b facing the first surface 51 a of the first movable fixing member 51.

When the coil 43 is energized, the motor 4 rotates the rotor 41 with respect to the stator 44. The stator 44 receives a reaction force from the rotor 41 when the rotor 41 rotates, and rotates in a direction opposite to the rotation direction of the rotor 41. When the stator 44 rotates in a direction opposite to the rotation direction of the rotor 41, the first movable fixing member 51 fixed to the stator 44 rotates in conjunction with the rotation of the stator 44. When the first moving and fixing member 51 fixed to the stator 44 rotates, the convex portion 51e of the first moving and fixing member 51 comes into contact with the convex portion 54e of the second moving and fixing member 54.
Due to the rotation of the stator 44, the surface of the convex portion 51 e of the first movable fixing member 51 among the surfaces where the convex portion 51 e of the first movable fixing member 51 abuts against the convex portion 54 e of the second movable fixing member 54 is the second surface. They are referred to as a third surface 51c and a fourth surface 51d. Similarly, by the rotation of the stator 44, the projection 54 e of the second movable fixing member 54 has a surface of the contact surface between the convex 51 e of the first movable fixing member 51 and the convex 54 e of the second movable fixing member 54. The surfaces are referred to as a third surface 54c and a fourth surface 54d.

  For example, when the third surface 51c of the first movable fixing member 51 comes into contact with the third surface 54c of the second movable fixing member 54 due to the rotation of the stator 44, the second movable fixing member 54 is fixed to a predetermined portion of the engine. Therefore, the third surface 51c of the first movable fixing member 51 receives the drag from the third surface 54c of the second movable fixing member 54 and stops. That is, the stator 44 is stopped in a state where the third surface 51c of the first movable fixing member 51 is in contact with the third surface 54c of the second movable fixing member 54. Similarly, when the fourth surface 51d of the first movable fixing member 51 comes into contact with the fourth surface 54d of the second movable fixing member 54, the fourth surface 51d of the first movable fixing member 51 becomes the second movable fixing member. 54 to receive the drag from the fourth surface 54d and stand still. That is, the stator 44 is stopped in a state where the fourth surface 51 d of the first movable fixing member 51 is in contact with the fourth surface 54 d of the second movable fixing member 54.

  As described above, the joint portion 5 has a mechanism for stopping the stator 44 with respect to the engine in the rotation direction of the rotation shaft of the rotor 41 (hereinafter, referred to as a “rotation stationary mechanism”). More specifically, the rotation and stationary mechanism includes a first moving fixed member 51 and a second moving fixed member 54 of the joint portion 5 that rotate the stator 44 that receives the reaction force from the rotor 41 when the rotor 41 rotates. This is a mechanism for stopping the engine 41 in the rotation direction of the rotation shaft of the rotor 41 with respect to the engine.

  As shown in FIG. 5, between the first surface 51a of the first movable fixing member 51 and the second surface 54b of the second movable fixing member 54, the second surface 51b of the first movable fixing member 51 and the second movable fixing. Between the first surface 54a of the member 54, between the third surface 51c of the first movable fixing member 51 and the third surface 54c of the second movable fixing member 54, and the fourth surface of the first movable fixing member 51. A gap is provided between 51d and the fourth surface 54d of the second movable fixing member 54, respectively.

The actual relative position (hereinafter, “actual relative position”) and relative angle (hereinafter, “actual relative angle”) between the control box 6 to which the motor 4 is connected and the phase adjustment unit 3 are determined by the accumulated tolerances such as the assembly tolerance and the component tolerance. ) Deviates from an ideal relative position (hereinafter referred to as “reference position”) and an ideal relative angle (hereinafter referred to as “reference angle”).
The joint portion 5 allows the actual relative position and the actual relative angle to be deviated from the reference position and the reference angle by providing the gap between the first movable fixing member 51 and the second movable fixing member 54. Thus, the connection between the phase adjustment unit 3 and the motor 4 is enabled.

More specifically, when the actual relative position and the actual relative angle are deviated from the reference position and the reference angle, the position and direction of the rotation axis of the phase adjustment unit 3 and the rotation of the rotor 41 are determined. The phase adjuster 3 and the motor 4 are connected by changing the position and angle of the stator 44 so as to match the position and direction of the shaft.
With reference to FIG. 6, an installation state of the joint unit 5 in a state where the phase adjustment unit 3 and the motor 4 are connected, in particular, an installation state of the first movable fixing member 51 and the second movable fixing member 54 will be described.

FIG. 6A is a diagram illustrating an installation state of the first movable fixing member 51 and the second movable fixing member 54 when the actual relative position and the actual relative angle do not deviate from the reference position and the reference angle.
FIG. 6B is a diagram illustrating an installation state of the first movable fixing member 51 and the second movable fixing member 54 when the actual relative angle is shifted from the reference angle.
FIG. 6C is a diagram illustrating an installation state of the first movable fixed member 51 and the second movable fixed member 54 when the actual relative position is shifted from the reference position in the radial direction of the rotation axis of the rotor 41. is there.
FIG. 6D is a diagram illustrating an installation state of the first movable fixed member 51 and the second movable fixed member 54 when the actual relative position is shifted from the reference position in the axial direction of the rotation axis of the rotor 41. is there.

  As shown in FIGS. 6B, 6C, and 6D, when the actual relative position and the actual relative angle are deviated from the reference position and the reference angle, the joint 5 is connected to the first movable fixed member 51 Since the gap is provided between the second moving and fixing member 54 and the position and the direction of the stator 44 so that the position and the direction of the rotation axis of the phase adjustment unit 3 and the position and the direction of the rotation axis of the rotor 41 are matched. By changing the angle, connection between the phase adjustment unit 3 and the motor 4 is enabled.

As described above, the elastic member 52 is sandwiched between the first moving and fixing member 51 and the second moving and fixing member 54 while being fixed to the first and second moving and fixing members 54. .
The elastic member 52 arranges the stator 44 at a predetermined position with respect to the phase adjustment unit 3 by the elastic force of the elastic member 52 in the axial direction of the rotation axis of the rotor 41.

More specifically, in the state shown in FIG. 6B, the elastic member 52 (not shown in FIG. 6B) is configured such that the axial direction of the rotation axis of the phase adjustment unit 3 and the axial direction of the rotation axis of the rotor 41 match. Then, for example, the rotor 41 is deformed in the radial direction of the rotating shaft. The elastic member 52 arranges the stator 44 at a predetermined position with respect to the phase adjustment unit 3 in the axial direction of the rotation shaft of the rotor 41 in the deformed state.
In the state shown in FIG. 6C, the elastic member 52 (not shown in FIG. 6C) is adjusted so that the radial position of the rotation shaft of the phase adjustment unit 3 and the radial position of the rotation shaft of the rotor 41 match. Then, for example, the rotor 41 is deformed in the radial direction of the rotating shaft. The elastic member 52 arranges the stator 44 at a predetermined position with respect to the phase adjustment unit 3 in the axial direction of the rotation shaft of the rotor 41 in the deformed state.
In the state shown in FIG. 6D, the elastic member 52 not shown in FIG. 6D deforms so as to expand and contract in the axial direction of the rotation shaft of the rotor 41. The elastic member 52 arranges the stator 44 at a predetermined position with respect to the phase adjustment unit 3 in the axial direction of the rotation shaft of the rotor 41 in the deformed state.

The space between the gaps provided between the first movable fixing member 51 and the second movable fixing member 54 is determined based on the maximum value of the deviation of the actual relative position and the actual relative angle with respect to the reference position and the reference angle.
Specifically, the interval of the gap provided between the first moving and fixing member 51 and the second moving and fixing member 54 is set to at least the amount of the motor 4 that can be moved by the rotor 41 with respect to the phase adjustment unit 3. Are determined so that the amount by which the stator 44 can move with respect to the control box 6 to which is connected is increased.
The amount by which the rotor 41 can move with respect to the phase adjustment unit 3 is the maximum value of the shift width at which the outer teeth 41a of the rotor 41 and the inner teeth 32a of the input rotator 32 can be connected. The amount by which the stator 44 can move with respect to the control box 6 to which the motor 4 is connected is, for example, the actual relative position and the reference angle with respect to the reference position and the reference angle as shown in FIGS. 6B, 6C, and 6D. When the actual relative angle is shifted, the joint portion 5 is the maximum allowable shift width for connecting the phase adjusting unit 3 and the motor 4.

Therefore, more specifically, the gap provided between the first movable fixed member 51 and the second movable fixed member 54 is such that the outer teeth 41a of the rotor 41 and the inner teeth 32a of the input rotary body 32 can be connected. The maximum value of the allowable deviation width of the joint portion 5 is determined to be larger than the maximum value of the deviation width.
That is, the joint portion 5 configured as described above is controlled by the amount that the rotor 41 can move with respect to the phase adjustment portion 3 with respect to the control box 6 fixed to the engine case 8 that houses the engine. There is a mechanism (hereinafter, referred to as a “movement adjusting mechanism”) that increases the amount by which the stator 44 can move relative to the engine.
The joint portion 5 has a movement adjusting mechanism, so that the play between the internal teeth 32a of the input rotary body 32 and the external teeth 41a of the rotor 41 is set to be small, and the actual relative to the reference position and the reference angle is set. The connection between the phase adjustment unit 3 and the motor 4 is enabled by allowing the deviation of the position and the actual relative angle.

  The movement adjusting mechanism sets the play of the fit between the internal teeth 32a of the input rotary body 32 and the external teeth 41a of the rotor 41 as small as possible, while reducing the amount of movement of the rotor 41 with respect to the phase adjustment unit 3. It is preferable to set the amount of movement of the stator 44 with respect to the control box 6 fixed to the engine case 8 accommodating the engine, that is, with respect to the engine so as to be at least twice as large.

Note that the deviation of the relative position and the relative angle between the fixed member to which the motor 4 is fixed and the phase adjustment unit 3 due to the accumulated tolerance are not absorbed by the joint unit 5 alone, but the relative angle and the rotation axis of the rotor 41. The displacement of the relative position in the axial direction of the rotor 41 is absorbed by the joint portion 5, and the displacement of the relative position in the radial direction of the rotation shaft of the rotor 41 is fixed to the engine case 8 and the control box 6 fixed to the engine case 8. It may be absorbed by changing the position.
With this configuration, the joint portion 5 can be reduced in size in the radial direction of the rotation shaft of the rotor 41.
When absorbing at least a part of the shift due to the accumulated tolerance by means other than the joint portion 5, for example, if the shift is absorbed by a portion where the gears mesh with each other, the input rotary body 32, the output portion 34, the pinion 36 It is preferable that the displacement is not absorbed by rotating members such as the input unit 37 and the rotor 41.

  As described above, the valve timing adjustment device 100 is a valve timing adjustment device 100 that adjusts the valve timing of a valve that opens and closes the camshaft 1 by transmitting crank torque from a crankshaft in an internal combustion engine. It has a motor 4 that outputs a control torque by rotating a rotor 41 disposed outside, and an input rotator 32 that rotates by the control torque output by the motor 4. A phase adjuster for adjusting a rotational phase between the cam shaft and a joint for connecting a stator to a predetermined portion of the internal combustion engine; And the amount by which the rotor 41 can move with respect to the phase adjustment unit 3, It has a movement adjustment mechanism stator 44 to increase the amount movable relative combustion engine, a.

  With this configuration, the relative position and relative angle between the fixing member to which the motor 4 is fixed and the phase adjustment unit 3 are set to the ideal relative position and relative position due to accumulated tolerances such as assembly tolerance and component tolerance. Even if the angle is shifted, the phase adjustment unit 3 and the motor 4 can be connected.

  Further, the valve timing adjusting device 100 is configured such that the motor 4 is an outer rotor type motor and the motor 4 and the joint portion 5 are installed inside the phase adjusting unit 3 so that the rotation axis of the phase adjusting unit 3 The thickness can be reduced in the direction.

  Further, the valve timing adjusting device 100 is configured such that the motor 4 is an outer rotor type motor and the joint portion 5 connects the engine and the stator 44 of the motor 4 so that rotation of the joint portion 5 is restricted. Therefore, wear of the joint portion 5 can be suppressed.

  Note that, in the present invention, within the scope of the invention, any constituent element of the embodiment can be modified, or any constituent element can be omitted in the embodiment.

  Reference Signs List 1 camshaft, 2 fixing screw, 3 phase adjustment section, 4 motor, 5 joint section, 6 control box, 7 chain, 8 engine case, 31 sprocket, 32 input rotating body, 32a internal tooth of input rotating body, 34 output section , 34a Internal teeth of output part, 35a, 35b, 35c, 35d Bearing, 36 pinion, first external tooth of 36a pinion, 36b second external tooth of pinion, 37 input part, internal tooth of 37a input part, 38 holding lid , 39 cap screw, 41 rotor, 41a external teeth, 42 magnet, 43 coil, 44 stator, 45a, 45b bearing, 51 first moving and fixing member, 51a first surface of first moving and fixing member, 51b first moving and fixing member A second surface, 51c a third surface of the first movable and fixed member, 51d a fourth surface of the first movable and fixed member, 51e a projection of the first movable and fixed member, 2 elastic member, 53 shaft core, 53a first falling prevention part, 53b second falling prevention part, 54 second movement fixing member, 54a first surface of second movement fixing member, 54b second part of second movement fixing member Surface, 54c Third surface of the second movable fixing member, 54d Fourth surface of the second movable fixing member, 54e Projection of the second movable fixing member, 100 Valve timing adjusting device.

Claims (7)

A valve timing adjustment device that adjusts the valve timing of a valve that opens and closes a camshaft by transmitting crank torque from a crankshaft in an internal combustion engine,
A motor that outputs a control torque by rotating a rotor disposed outside the stator,
A phase adjustment unit that has an input rotator that is rotated by the control torque output by the motor, and that adjusts a rotation phase between the crankshaft and the camshaft according to a rotation state of the input rotator;
A coupling portion for connecting the stator and a predetermined portion of the internal combustion engine,
With
The joint portion includes a rotation and stationary mechanism that stops the stator with respect to the internal combustion engine in a rotation direction of a rotation shaft on which the rotor rotates, and an amount of movement of the internal combustion engine with respect to the phase adjustment portion, the amount of movement of the rotor. And a movement adjustment mechanism for increasing the amount by which the stator can move. The amount by which the rotor can move with respect to the phase adjustment unit, and the amount by which the stator can move with respect to the internal combustion engine depend on the rotation direction, radial direction, and axial direction of the rotating shaft on which the rotor rotates. The valve timing adjusting device according to claim 1, wherein the valve timing adjusting device is movable in at least one of the directions. The magnitude of the amount by which the stator can move with respect to the internal combustion engine is at least twice as large as the magnitude of the amount by which the rotor can move with respect to the phase adjustment unit. 2. The valve timing adjusting device according to 1. The said joint part is arrange | positioned in the axial direction of the rotating shaft with which the said rotor rotates, and the radial inside of the said rotating shaft from the position where the said stator was arrange | positioned, The position characterized by the above-mentioned. A valve timing adjustment device as described in the above. A first movable fixed member fixed to the stator, a second movable fixed member fixed to the predetermined portion of the internal combustion engine, one end fixed to the first movable fixed member, And an elastic member having the other end opposed to the second movable fixed member.
The valve timing adjusting device according to claim 1, wherein the elastic member is deformable in a rotation direction, a radial direction, and an axial direction of a rotation shaft on which the rotor rotates. The valve timing adjustment device according to claim 5, wherein the elastic member holds a relative position between the motor and the phase adjustment unit in an axial direction of a rotation shaft on which the rotor rotates. A first movable fixing member fixed to the predetermined portion of the internal combustion engine and having a through hole in an axial direction of a rotating shaft on which the rotor rotates, and a rotating member fixed to the stator and rotating the rotor; A second movable fixed member having a through hole in the axial direction of the shaft, and a shaft core portion inserted into both the through hole of the first movable fixed member and the through hole of the second movable fixed member,
The valve timing adjustment device according to claim 1, wherein the shaft core regulates a maximum distance between the motor and the phase adjustment unit.

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