JP5666002B2 - Actuator - Google Patents

Description

  The present invention relates to an actuator having a connection structure for connecting an external device and a shaft.

In an actuator having a shaft that reciprocates in a linear direction, there has been a connection method as disclosed in Patent Document 1, for example, as a method for connecting a shaft and an external device. Here, FIG. 7 shows a configuration in which a turbocharger is used as an external device as an example, and a lever for driving a wastegate valve of this turbocharger and a shaft are connected. An end portion of the shaft 1 driven in the linear motion direction by an actuator (not shown) is a male screw portion 1a, and one end portion of the joint 4 is fixed by nuts 2 and 3. One end portion of the link plate 6 is attached to the other end portion of the joint 4 with a pin 5 so as to be bent, and the pin 8 of the turbo lever 7 is attached to the other end portion of the link plate 6 so as to be bent. FIG. 8 is a cross-sectional view of the connection structure of the link plate 6 and the pin 5 taken along the line AA.
When the shaft 1 and the joint 4 are linearly moved integrally, the lever 7 is pressed via the link plate 6 to rotate around the fulcrum 9, and a wastegate valve (not shown) connected to the fulcrum 9. Operates to open and close the wastegate.

International Publication No. 2008/035481 Pamphlet

In the conventional connection method, since the joint 4 is fixed to the shaft 1 by the nuts 2 and 3, the joint 4 and the link plate 6 have a rotation margin around the axis of the shaft 1 (rotation direction indicated by an arrow in FIG. 7). almost none. Therefore, when the actuator with the joint 4 and the link plate 6 fixed is mounted on the turbocharger, the link plate 6 may be pinned depending on variations in the inclination of the pin 8 on the turbo side and the inclination of the link plate 6 on the actuator side. There was a problem that it was not possible to assemble to 8.
Therefore, when the link plate 6 is assembled to the turbo lever 7, additional work such as loosening the nuts 2 and 3 and adjusting the position of the link plate 6 together with the joint 4 to the pin 8 is required. There was a problem that the mountability of was low.

The inclination of the pin 8 here means that the axis X of the pin 8 is inclined in the direction of the X ′ axis in accordance with the posture of the lever 7 attached to the turbo side, as shown in FIG.
Further, the inclination of the link plate 6 is a backlash derived from the tolerance between the link plate 6 and the joint 4 as shown in a sectional view in FIG. If the inclination of the pin 8 is within the backlash of the link plate 6, the link plate 6 can be assembled while being inclined in accordance with the inclination of the pin 8. However, as shown in FIG. 8, the link plate 6 is brought into edge contact with the pin 5 to cause uneven wear, which is not preferable. Similarly, even if the link plate 6 is assembled with the pins 8 tilted with respect to the pins 8, the link plates 6 are in contact with the pins 8 at the edges, and uneven wear occurs.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an actuator with improved mountability to an external device.

An actuator according to the present invention is connected to an external device, a connecting member that transmits linear motion of the shaft to the external device, a joint that connects one end to the connecting member, the other end to the shaft, and linearly moves integrally with the shaft. And a rotating mechanism for rotatably mounting the joint around the shaft axis , the rotating mechanism including a collar extrapolated to the shaft and two nuts secured to the shaft with the collar sandwiched therebetween. has a joint is shall be loosely fitted on the outer peripheral surface of the collar.

An actuator according to the present invention is connected to a lever of a turbocharger, and transmits a linear movement of the shaft to the lever. The connecting member has one end connected to the connecting member and the other end connected to the shaft, and linearly moves integrally with the shaft. A joint and a rotation mechanism that attaches the joint so as to be rotatable about the shaft axis are provided . The rotation mechanism includes a collar that is extrapolated to the shaft and two nuts that are fixed to the shaft with the collar sandwiched therebetween. has the door, the joint is shall be loosely fitted on the outer peripheral surface of the collar.

  According to the present invention, by connecting the joint so as to be rotatable about the axis of the shaft, the connecting member is connected to the external device while the rotation mechanism absorbs variations on both the external device side such as the turbocharger and the actuator side. Can do. Therefore, the mounting property of the actuator on an external device can be improved.

It is a front view which shows the rotation mechanism of the actuator which concerns on Embodiment 1 of this invention. It is sectional drawing of the rotation mechanism shown in FIG. 3 is a partial cross-sectional view illustrating an example of an actuator according to Embodiment 1. FIG. It is sectional drawing which shows the modification of the rotation mechanism shown in FIG. It is sectional drawing which shows another modification of the rotation mechanism shown in FIG. It is sectional drawing which shows another modification of the rotation mechanism shown in FIG. It is a perspective view which shows an example of the connection structure of the shaft and external device in the conventional actuator. It is sectional drawing which cut | disconnected the connection structure shown in FIG. 7 along the AA line.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1 and 2 show a configuration of a rotating mechanism 10 that rotatably connects the shaft 1 and the joint 4 of the actuator according to the first embodiment. In FIGS. 1 and 2, the same or equivalent parts as those shown in FIGS.

As shown in the figure, the rotating mechanism 10 that connects the shaft 1 and the joint 4 is composed of a nut 11 with a flange, a nut 12, and a collar 13. A male screw part 1 a is formed at the end of the shaft 1, and a hole 4 a for inserting the shaft 1 and the collar 13 is formed at one end of the joint 4. The collar 13 includes a flange portion 13a and a cylindrical portion 13b. The length of the cylindrical portion 13b is equal to or greater than the thickness of the joint 4, and the outer diameter of the cylindrical portion 13b is equal to or smaller than the diameter of the hole 4a.
With the hole 4 a of the joint 4 loosely fitted to the outer peripheral surface of the cylindrical portion 13 b of the collar 13, the collar 13 is inserted into the shaft 1 into which the flanged nut 11 is screwed in advance, and the nut 12 is further screwed into the shaft 1. In addition, the joint 4 is sandwiched between the flanged nut 11 and the nut 12 and fixed to the shaft 1. Thereby, the rotation mechanism 10 becomes a flexible connection structure in which the joint 4 can rotate to an arbitrary position around the collar 13.

Although the flanged nut 11 is used in the illustrated example, a nut having the same shape as the nut 12 may be used instead of the flanged nut 11. That is, the rotation mechanism 10 is composed of two nuts 12 and one collar 13.
Alternatively, the rotation mechanism 10 may be constituted by two flanged nuts 11 and one collar 13. In this case, the flange portion 13a of the collar 13 can be omitted.
Further, the positions of the flanged nut 11 and the nut 12 may be interchanged.
In addition, the pin 5 illustrated in FIG. 1 has a rivet shape in which three cylinders 5a, 5b, and 5c having different diameters are overlapped so that their central axes coincide with each other. However, the present invention is not limited to this. 4, any member that can be attached to the link plate 6 so as to be freely bent may be used.

FIG. 3 shows an example of an actuator 100 that linearly drives the shaft 1. Here, a turbocharger is used as an example of an external device on which the actuator 100 is mounted, and a case where the actuator 100 is used as a waste gate actuator (WGA) for driving a waste gate valve will be described.
In the actuator 100, in the motor unit 101, a stator core 102, a bobbin 103 attached to the stator core 102, and a coil 104 wound around the bobbin 103 are fixed to a housing 105 by molding and fixed. A child is configured. A boss 110 that covers the shaft 1 is attached to the end surface of the housing 105.

Inside the stator core 102, a rotor 111 and a magnet 112 attached to the rotor 111 are rotatably provided to constitute a rotor. The rotor 111 is rotatably supported by a bearing 114, and a female screw portion 116 is formed in a center hole 115 provided in the center of the rotor 111.
On the other hand, on the outer peripheral surface of the shaft 1, a male screw portion 117 that is screwed into the female screw portion 116 of the rotor 111 is formed. The rotational movement of the rotor 111 is converted into the linear movement of the shaft 1 by screwing of the female screw part 116 and the male screw part 117.

A guide hole 118 that supports the shaft 1 so as to be movable in the linear motion direction is provided on the tip side of the boss 110. Further, as a detent mechanism for restricting the rotation of the shaft 1 around the axis, for example, the peripheral surface shape of the shaft 1 is partially deformed into a flat shape or a notch shape, and the inner peripheral surface of the guide hole 118 is changed to the shaft 1. It is made to deform so as to fit into the deformed shape.
Further, a biasing member 119 such as a coil spring that constantly biases the shaft 1 in one direction is disposed inside the boss 110. One end of the biasing member 119 is held by the boss 110 and the other end is held by the spring receiving member 120. Has been. The spring receiving member 120 is press-fitted and fixed to the shaft 1.

Further, the front end side of the shaft 1 passes through the boss 110 and is rotatably connected to the joint 4 by the rotating mechanism 10 on the outside, and the joint 4 is connected to a link plate (connecting member) 6 so as to be bent. Yes. The actuator 100 in this state is mounted on an external device such as a turbocharger.
A lever 7 that rotates about a fulcrum 9 is attached to the other turbocharger side. At the time of mounting, one end of the lever 7 and one end of the link plate 6 are connected by a pin 8 so as to be freely bent. A west gate valve (not shown) is attached to the fulcrum 9 of the lever 7. The waste gate valve opens and closes the waste gate in accordance with the rotation of the lever 7, and the exhaust gas introduced from the engine to the turbine of the turbocharger. Controls the gas supercharging pressure.

In the first embodiment, by using the collar 13, the joint 4 and the link plate 6 can be rotated around the axis of the shaft 1. Therefore, as described above, even if the pin 8 of the lever 7 has an inclination variation, the posture of the link plate 6 can be easily adjusted and assembled to the pin 8 by rotating the joint 4 around the axis. it can. Therefore, the additional work etc. which loosen nuts 2 and 3 and rotate the joint 4 like the prior art example shown in FIG. 7 are unnecessary.
Furthermore, since the joint 4 and the link plate 6 rotate integrally, it can be avoided that the link plate 6 is assembled in an inclined state with respect to the pins 5 and 8 of the lever 7. Therefore, there is no edge contact as shown in FIG. 8, and the friction resistance can be improved.

Next, the operation of the actuator 100 will be described.
FIG. 3 shows the valve closed state. When the rotor 111 rotates in this state, the male screw portion 117 of the shaft 1 screwed with the female screw portion 116 of the center hole 115 is driven from the female screw portion 116. In order to receive the force, the shaft 1 is linearly moved without being rotated by being guided by the guide hole 118 in a direction in which the shaft 1 protrudes outward from the boss 110. Then, since the shaft 1 presses one end of the lever 7 via the joint 4 and the link plate 6, the lever 7 rotates about the fulcrum 9 to open the wastegate valve (not shown).

  When the rotor 111 is rotated in the opposite direction in the valve open state, the male threaded portion 117 of the shaft 1 that is screwed with the female threaded portion 116 of the center hole 115 is reversed from the female threaded portion 116. Therefore, the shaft 1 is guided by the guide hole 118 and moves linearly without being rotated, so that the shaft 1 moves back into the boss 110. Then, the link plate 6 moves backward together with the joint 4 connected to the shaft 1, so that the lever 7 rotates about the fulcrum 9 in the opposite direction to close the wastegate valve (not shown).

  The joint 4 can rotate around the axis of the shaft 1, but the rotation after the assembly is suppressed because the link plate 6 is assembled to the pin 8 of the lever 7. Therefore, the joint 4 moves linearly with the shaft 1.

In order to further suppress the rotation of the joint 4 about the axis, a friction applying member such as a spring or a spring washer (spring washer) may be sandwiched between the joint 4 and the flanged nut 11. An example is shown.
FIG. 4 is a modification in which a spring washer 14 is added to the rotating mechanism 10 shown in FIG. In this configuration, only when the link plate 6 is assembled to the pin 8 of the lever 7, the joint 4 and the link plate 6 are freely rotated around the shaft 1 by applying a force greater than the spring force of the spring washer 14. You can adjust the posture. When the actuator 100 is operating normally, the spring washer 14 gives friction to the rotation of the joint 4 around the axis, so that it is difficult to rotate. Thereby, it is possible to suppress the joint 4 from freely rotating during the operation of the actuator 100 and to stabilize the contact state between the link plate 6 and the pin 8 of the lever 7.

  In the example of FIG. 4, the friction applying member is sandwiched between the joint 4 and the flanged nut 11. However, the present invention is not limited to this, and the flange 13 a between the collar 13 and the joint 4 is not limited thereto. You may make it the structure pinched | interposed.

  As described above, according to the first embodiment, the actuator 100 is coupled to the lever 7 of the turbocharger and transmits the linear motion of the shaft 1, and the link plate 6 and the shaft 1 are coupled to the shaft 1. And a rotation mechanism 10 that attaches the joint 4 so as to be rotatable about the axis of the shaft 1. The rotation mechanism 10 includes a collar 13 that is extrapolated to the shaft 1 and the collar 13. The joint 4 is configured to be loosely fitted to the flange portion 13 b of the collar 13. Therefore, the link plate 6 and the pin 8 can be assembled while absorbing the variation in the inclination of the pin 8 of the turbo lever 7 and the variation in the assembly on the actuator 100 side by the rotation mechanism 10. Therefore, the mounting property of the actuator 100 on the turbocharger can be improved.

  Further, according to the first embodiment, the rotation mechanism 10 has the spring washer 14 that gives friction to the rotation of the joint 4, so that the joint 4 and the link plate 6 freely rotate when the actuator 100 is operated. This can be suppressed and the contact state between the link plate 6 and the pin 8 of the lever 7 can be stabilized.

1, 2, and 4, the nut 12 and the collar 13 are configured separately, but may be configured integrally.
FIG. 5 is a modification of the connection structure 10 shown in FIG. In this example, the legs are extended from the nut 12 to form a nut 15 with a collar in which the nut 12 and the collar 13 are integrated. Of course, the positions of the nut 15 with collar and the nut 11 with flange may be interchanged.
Further, as shown in FIG. 6, the joint 4 may be connected to the shaft 1 by using two nuts 15 with a collar.
When the collar-equipped nut 15 is used as shown in FIG. 5 or FIG. 6, the same effect as in the first embodiment can be obtained. Further, the number of parts does not increase as compared with the conventional example in which the joint 4 is fixed to the shaft 1 with the two nuts 2 and 3. Further, a friction applying member such as a spring washer 14 may be added to suppress the rotation of the link plate 6 during the operation of the actuator 100.

1 to 6, an example in which the link plate 6 on the actuator 100 side is assembled to the lever 7 of the turbo wastegate valve has been described. However, the present invention is not limited to this, and a nozzle vane of a VG (Variable Geometry) turbo is provided. It can also be assembled to a lever for opening and closing.
Moreover, although the example which mounts the actuator 100 of the state which connected the joint 4 and the link plate 6 to the shaft 1 in the turbocharger provided with the lever 7 was demonstrated, it is not limited to this, A joint is attached to the shaft 1. It is also possible to mount the actuator 100 in a state where 4 is connected to a turbocharger in which the link plate 6 is connected to the lever 7.

  In addition to the above, within the scope of the invention, the invention of the present application can be modified with any component of the embodiment or omitted with any component of the embodiment.

  1 shaft, 1a male thread, 2, 3 nut, 4 joint, 4a hole, 5 pin, 5a, 5b, 5c cylinder, 6 link plate (connecting member), 7 lever, 8 pin, 9 fulcrum, 10 rotation mechanism, 11 Nut with flange, 12 nut, 13 collar, 13a flange portion, 13b cylindrical portion, 14 spring washer (friction applying member), 15 nut with collar, 100 actuator, 101 motor portion, 102 stator core, 103 bobbin, 104 coil, 105 Housing, 110 Boss, 111 Rotor, 112 Magnet, 114 Bearing, 115 Center hole, 116 Female thread part, 117 Male thread part, 118 Guide hole, 119 Biasing member, 120 Spring receiving member.

Claims (4)

In an actuator having a shaft that linearly moves in an axial direction,
A connecting member connected to an external device and transmitting the linear motion of the shaft to the external device;
One end connected to the connecting member, the other end connected to the shaft, and a joint that linearly moves integrally with the shaft;
A rotation mechanism for rotatably mounting the joint around the shaft axis ;
The rotating mechanism has a collar extrapolated to the shaft, and two nuts fixed to the shaft with the collar sandwiched therebetween,
The actuator is characterized in that the joint is loosely fitted to the outer peripheral surface of the collar . Rotation mechanism, the actuator according to claim 1, wherein the configuring the nut and collar integrally. Rotation mechanism, the actuator according to claim 1, wherein a friction imparting member to provide friction to the rotation of the joint. In an actuator having a shaft that linearly moves in an axial direction,
A connecting member that is connected to a lever of the turbocharger and transmits the linear motion of the shaft to the lever;
One end connected to the connecting member, the other end connected to the shaft, and a joint that linearly moves integrally with the shaft;
A rotation mechanism for rotatably mounting the joint around the shaft axis ;
The rotating mechanism has a collar extrapolated to the shaft, and two nuts fixed to the shaft with the collar sandwiched therebetween,
The actuator is characterized in that the joint is loosely fitted to the outer peripheral surface of the collar .

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