JPH0720084U - Actuator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an actuator capable of simplifying setting management of output shaft alignment. A bearing 7 is fixed to one side of a rotor 8, an output shaft 6 is connected to the other side of the rotor 8, and the bearing 7 is rotatably supported by a rotor support shaft 3 attached to a case body 2a. An actuator 1 fixed to the vehicle body side via a case cover 2b attached to 2a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an actuator used for changing a damping force of a shock absorber of an automobile by increasing or decreasing the damping force by supplying electric current.

[0002]

[Prior art]

 An actuator shown in FIG. 3 is known as an actuator for changing the damping force of a shock absorber of an automobile by increasing or decreasing it by sending an electric current. In the illustrated actuator 50, one bearing 52 is attached on one side which is a non-open side of a case 51 having a bottom shape, and a case cover 53 which is a separate body from the case 51 on the other side of the case 51. The other bearing 54 is attached to. Since the output shaft 55 is inserted in the case 51 through the one bearing 52 and the other bearing 54, the output shaft 55 is rotatably supported by both bearings 52 and 54. A rotor 56 is fixed to the output shaft 55, and a stator 57 is arranged on the outer peripheral side of the rotor 56. By supplying an electric current to the stator 57, the stator 57 and the rotor 56 are separated from each other. The rotor 56 and the output shaft 55 are integrally rotated by a predetermined angle due to the magnetic force generated between them. The case 51 is attached to the vehicle body panel 60 via the case cover 53 by tightening screws 58, and a control rod of a shock absorber (not shown) is connected to the output shaft 55 on the outside of the case 51 to output the shaft 55. Since the control rod is rotated by the rotational power of the control rod, the damping force can be increased or decreased by changing the combination of the inner diameters of the orifices in the shock absorber by the rotation of the control rod. Has become. Such a structure is described in Japanese Utility Model Publication No. 4-47460.

[0003]

In the above-mentioned conventional actuator 50, the output shaft 55 having the rotor 56 attached thereto has one bearing 52 attached to one side of the case 51 and the other bearing 52 attached to the case cover 53. Since the output shaft 55 is rotatably supported by 54, one bearing 52 and the other bearing 54 are attached to the case 51 and the case cover 53, which are separate bodies. Since the elements for setting the axial center of the output shaft 55 are the case 51, the case cover 53, and the bearings 52, 54, the case cover 53 and the case 51 are fastened together with the screw 58. It is said that the tightening stress of the screw 58 when mounted on the vehicle body panel 60 is not directly applied to the case cover 53 and the case 51. If the bearings 52 and 54 are displaced due to the tightening stress of the screw 58 acting on the case cover 53 and the case 51, the output shaft 55 will be out of alignment. There is a problem in that the setting and management of the 55 alignment may involve complicated work, and it has been an issue to solve the above-mentioned problems.

[0004]

[The purpose of the device]

 An actuator according to the present invention aims to provide an actuator capable of simplifying setting management of alignment of an output shaft.

[0005]

[Constitution of device]

[0006]

[Means for Solving the Problems]

 An actuator according to the present invention has a case body whose one side is opened, a case cover which is attached to the open side of the case body, a rotor support shaft which is attached to the case body, and an electric current which is housed in the case body. A stator that generates magnetic force by supply, a rotor that is arranged inside the stator and that generates rotational power by the magnetic force generated by the stator, and is fixed to one side of the rotor and rotatably supported by the rotor support shaft. It is characterized by a bearing and an output shaft connected to the other side of the rotor.In the embodiment adopted as needed, the case body has a top wall and a top wall. Attach the rotor support shaft to the case, and provide at least one case cover tightening protrusion on the open side so that the case cover protrudes outward. The bending protrusions are provided so as to correspond to the case cover crimping protrusions on the case body, and the case cover bending protrusions are crimped and fixed to the case cover crimping protrusions on the case body. Can be

[0007]

[Function of the device]

 In the actuator according to the present invention, the rotor having the bearing fixed to one side and the output shaft connected to the other side has the case in which the bearing is rotatably supported by the rotor support shaft fixed to the case body. It is rotatably supported by the body. Therefore, since the bearing is not provided on the case side, the only element for setting the shaft center of the output shaft is the rotor support shaft, and tightening stress on the case cover during mounting on the vehicle body side However, the stress does not act directly on the bearing or output shaft.

[0008]

【Example】

 1 and 2 show an embodiment of an actuator according to the present invention. FIG. 1 is a vertical front view of the actuator, and FIG. 2 is a partially cutaway bottom view of the actuator.

In the illustrated actuator 1, a case 2 is formed from a case body 2a and a case cover 2b, and a ceiling wall 2a2 is provided on the side opposite to the open side of the side wall 2a1 having a substantially cylindrical shape of the case body 2a. Is provided.

A round hole-shaped shaft mounting portion 2a3 is provided substantially in the center of the ceiling wall 2a2, and the small diameter portion 3a of the stepped rotor support shaft 3 is a flat washer. It is attached via 4. A large diameter portion 3b of the rotor support shaft 3 attached to the shaft attachment portion 2a3 projects to almost the center of the case 2 and is non-rotatably supported by the case body 2a.

A packing or O-ring 5 is attached to the open side of the side wall 2a1 of the case main body 2a, and a case cover member protruding in a rectangular shape from the six opposite sides of the side wall 2a1 to the outer peripheral surface. Tightening projections 2a4 are provided respectively.

The case cover 2b has a substantially circular shape, and is formed on the case cover 2b so as to correspond to the case cover caulking convex portion 2a4 of the case body 2a so as to project outward. Bending projections 2b1 are provided respectively, and the case cover 2b is pressed against the O-ring 5 on the open side of the side wall 2a1 of the case body 2a and then the case cover tightening protrusion of the case body 2a. The bending projection 2b1 is attached to the 2a4 by being crimped.

A guide 2b2 having a cylindrical shape is attached to substantially the center of the case cover 2b, and an output shaft 6 described later is inserted inside the guide 2b2.

As is clear from FIG. 2, the case cover 2b is provided with vehicle body side mounting flanges 2b3 at two locations on the outer periphery between the adjacent bending protrusions 2b1. The actuator 1 is mounted on the vehicle body by tightening a screw (not shown) through the side mounting flange 2b3.

A bearing 7 is attached to the large diameter portion 3b of the rotor support shaft 3 attached to the shaft attaching portion 2a3 of the case body 2a. A rotor 8 is attached to the outside of the bearing 7, and the rotor 8 is also integrally provided with a cylindrical magnet holder 8b on the inner peripheral side of a cylindrical magnet 8a. A center hole 8b1 is formed in the center of the magnet holder 8b, and the bearing 7 is fixed to one side of the center hole 8b1. On the other side of the center hole 8b1 of the magnet holder 8b, as apparent from FIG. 2, an output shaft connecting portion 8b2 formed in the shape of an elongated hole is provided, and this output shaft connecting portion is formed. Since the locking projection 6a formed on the base end side of the output shaft 6 is non-rotatably locked to 8b2, the magnet 8a, the magnet holder 8b, and the output shaft 6 can rotate on the rotor support shaft 3 by the bearing 7. Supported by. Here, since the output shaft 6 is rotatably supported by the rotor support shaft 3 fixed to the case body 2a, the setting of the axial center of the output shaft 6 is not related to the case cover 2b. The base end side of the output shaft 6 is prevented from coming off from the case cover 2b by the holder 2b2 of the case cover 2b via the flat washer 9 and the wave washer 10, and the tip end side of the output shaft 9 projects from the open side of the case body 2a. It is in a state.

On the other hand, a stator 11 is arranged outside the rotor 8. The stator 11 is provided with four coil portions 11d, 11e, 11f and 11g on two coil bobbins 11b and 11c inside the iron core 11a, and the stator 11 has coil portions 11d, 11e, 11f and 11g. The current is sequentially supplied through the lead wires 12, 13, 14, 15, 16 respectively connected to the magnets to sequentially generate a magnetic force to form a rotating magnetic field, so that the magnet 8a of the rotor 8 operates in the rotating magnetic field. It is given a rotational force and rotates within a predetermined angle range.

In the actuator 1 having such a structure, the bearing 7 fixed to the rotor guide 8b of the rotor 8 is inserted and attached to the rotor support shaft 3 attached to the shaft attachment portion 2a3 of the case body 2a, The stator 11 is arranged in the main body 2a, and the case cover 2b in which the output shaft 6 is inserted into the guide 2b2 via the wave washer 10 and the flat washer 9 is pressed against the O-ring 5 attached to the main body 2a of the case 2b. The case cover 2b is assembled to the case body 2a by crimping the bending protrusions 2b1 against the case cover crimping convex portions 2a4 of the case body 2a. Then, the case cover 2b is brought into contact with a vehicle body panel (not shown) while connecting the tip end side of the output shaft 6 to a control rod of a shock absorber (not shown), and a screw (not shown) is attached from the upper side in FIG. 1 to the vehicle body of the case cover 2b. The actuator 1 is attached to the vehicle body by being fastened to the vehicle body panel via the side attachment flange 2b3.

Since the output shaft 6 is supported by the rotor support shaft 3 attached to the case body 2a when the screw is tightened through the vehicle body side attachment flange 2b3 of the case cover 2b. The stress generated in the case cover 2b by the tightening of the screws is not directly received.

[0019]

[Effect of device]

 As described above, since the actuator according to the present invention has the above-described configuration, even if the case cover is tightened when mounted on the vehicle body side, etc., the stress is directly applied to the output shaft and the bearing. This is an excellent effect that the setting management of the output shaft alignment can be simplified. Even when the case cover is attached to the case body by crimping, the force applied to the case cover does not easily act on the output shaft and bearings, so simplifying the setting management of the output shaft alignment. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an actuator according to the present invention.

2 is a partially cutaway bottom view of the actuator shown in FIG. 1. FIG.

FIG. 3 is a sectional view of a conventional actuator.

[Explanation of symbols]

 1 Actuator 2a Case body 2b Case cover 3 Rotor support shaft 6 Output shaft 7 Bearing 8 Rotor 11 Stator

Claims (2)

[Scope of utility model registration request] 1. A case body whose one side is open, a case cover attached to the open side of the case body, a rotor support shaft attached to the case body, and an electric current stored in the case body. And a rotor disposed inside the stator and generating rotational power by the magnetic force generated by the stator; and a rotor fixed to one side of the rotor and attached to the rotor support shaft. An actuator comprising a bearing rotatably supported and an output shaft connected to the other side of the rotor. 2. A fold that has a top wall on the case body, has a rotor support shaft attached to the top wall, and has at least one case cover tightening protrusion on the open side, and the case cover has a protrusion protruding outward. The bending projection is provided in correspondence with the case cover crimping convex portion of the case body, and the bending projection of the case cover is crimped and fixed to the case cover crimping convex portion of the case body. Actuator described in.