JP6277139B2 - Motor holding mechanism and actuator - Google Patents

Description

  The present invention relates to an actuator in which a motor and a gear train are housed in a case and integrated, and particularly relates to a motor holding mechanism.

  There is known an actuator in which a motor and a gear train are housed in a case and integrated. In such motor-integrated actuators, there is a mechanism that employs a structure in which a support portion that can be elastically deformed is provided on a case and one end of the motor is pressed and held by the elastic force of the support portion as a mechanism for holding the motor. (Patent Document 1).

  In the motor holding mechanism using the elastically deformable support part, the number of parts of the actuator can be reduced by forming the support part integrally with the case. However, if the elastic force of the support portion is increased in order to increase the pressing force of the motor, a large force is required even when the support portion is expanded to fit the motor, and the assembly of the actuator becomes difficult. In addition, if the elastic force of the support part is reduced to facilitate the assembly of the actuator, if strong vibration or impact is applied to the motor from the outside, the support part may be damaged without supporting the motor, or the motor may come off. There is a risk that.

JP 2010-200407 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor holding mechanism and an actuator that are easy to mount a motor and can hold the motor firmly.

  In order to achieve the above object, the motor holding mechanism of the present invention has a motor, a base plate to which the motor is attached, and a cover attached to the base plate, and the base plate regulates the position of the front end portion of the motor. And a base side support portion that presses the rear end portion of the motor in the direction of the front end support portion by an elastic force, and the cover moves the base side support portion in the direction of the front end support portion. The cover side support part to press is provided.

  The cover side support portion is configured to press the base side support portion by an elastic force.

  The cover side support part presses the base side support part by regulating the position of the base side support part.

  The actuator of the present invention includes a motor, a gear train, a base plate to which the motor and the gear train are attached, and a cover attached to the base plate, and the base plate is positioned at a front end portion of the motor. And a base side support portion that presses the rear end portion of the motor in the direction of the front end support portion with an elastic force, and the cover includes the base side support portion of the front end support portion. A cover-side support that presses in the direction is provided.

  The cover side support portion is configured to press the base side support portion by an elastic force.

  The cover side support part presses the base side support part by regulating the position of the base side support part.

  A worm constituting the gear train is fixed to a motor shaft protruding from a front end portion of the motor, and the base plate has an elastic force in the direction of the base-side support portion at least one of the shaft of the motor and the worm. It is characterized by having a shaft support part which presses by.

  According to the present invention, it is possible to provide a motor holding mechanism and an actuator that are easy to mount a motor and can hold the motor firmly.

It is an external appearance perspective view of the actuator of an embodiment. It is the perspective view which removed the cover from the actuator of FIG. It is a perspective view of the base plate of an embodiment. It is a perspective view inside a cover of an embodiment. It is sectional drawing before the cover attachment of the actuator of embodiment. It is sectional drawing which shows the motor holding mechanism of embodiment. It is sectional drawing which shows the motor holding mechanism of other embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an external perspective view of an actuator according to an embodiment of the present invention, and FIG. 2 is a view showing an internal structure of the actuator with the cover 2 of FIG. 1 removed. In the actuator of the embodiment, a motor 4 and a speed reduction mechanism are housed in a case constituted by a resin base plate 1 and a cover 2, and an output shaft 3 projects from an opening provided in the cover 2.

  The actuator speed reduction mechanism is fixed to the output shaft 3 and a first worm 7a fixed to the motor shaft 4c, a gear having a first worm wheel 7b formed at one end and a second worm 7c formed at the other end. And a second worm wheel 7d. The first worm 7a meshes with the first worm wheel 7b to constitute a first worm gear, and the second worm 7c meshes with the second worm wheel 7d to constitute a second worm gear.

  FIG. 3 is a perspective view of the inner surface of the base plate 1. The base plate 1 is formed of resin, and the motor installation portion 9 includes a fixed seat 10 on which the motor 4 is placed. Further, along the rotation axis direction of the motor 4, the base side support portion 5 that has elasticity and supports the rear end portion 4b of the motor, the front end support portion 8 that supports the front end portion 4a of the motor, and the motor that has elasticity. A shaft support portion 6 that supports the tip of the shaft 4c is provided. The fixed seat 10, the base side support portion 5, the front end support portion 8, and the shaft support portion 6 are integrally molded with the base plate 1, thereby reducing the number of parts of the actuator and improving the assembly workability.

  The front end support portion 8 is provided with a groove 8a into which the motor bearing portion 4d is fitted, and the position of the groove 8a is the same as that of the first worm 7a when the motor bearing portion 4d is fitted into the groove 8a. 1 The worm wheel 7b is set at a position where it properly meshes. The shaft support 6 presses the tip of the motor shaft 4c in the direction of the base support 5 in order to reduce the play in the rotation axis direction of the first worm 7a fixed to the motor shaft 4c. The shaft support 6 may be structured to press the tip of the first worm 7 a in the direction of the base support 5.

  FIG. 4 is a perspective view of the inner surface of the cover 2. In the place facing the motor installation part 9 of the base plate 1, there is a motor holding part 13 that holds the upper part of the motor 4, and a cover side that has elasticity and biases the base side support part 5 of the base plate 1 toward the front end support part 8. A support portion 11 and a front end pressing portion 12 that is fitted in the groove 8a and presses the bearing portion 4d of the motor to prevent the motor from rising up are provided.

  The motor holding mechanism of the embodiment will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing a state where the motor 4 is attached to the base plate 1. The motor 4 is attached by spreading the elastic base-side support 5 and shaft support 6 in the opposite direction to the front-end support 8, respectively, and by the base-side support 5, front-end support 8 and shaft support 6. The motor 4 is fixed to the base plate 1.

  The motor 4 fixed to the base plate 1 includes a force that presses the distal end portion of the motor shaft 4 c toward the base side support portion 5 by the elastic force of the shaft support portion 6, and an elastic force of the base side support portion 5. The force which presses the rear-end part 4b in the direction of the front-end support part 8 is added. Since the elastic force of the base side support portion 5 is set larger than the elastic force of the shaft support portion 6, the base side support portion 5 uses the elastic force of the base side support portion 5 and the shaft support for the rear end portion 4 b of the motor. The front end support portion 8 is pressed with a force corresponding to the difference in elastic force of the portion 6.

  FIG. 6 is a cross-sectional view showing a state where the cover 2 is attached to the base plate 1. The plate-like cover side support portion 11 having elasticity provided in the cover 2 is provided at a position where a part of the plate side support portion 11 interferes with the base side support portion 5. When the cover 2 is attached to the base plate 1, the cover-side support portion 11 abuts against the base-side support portion 5, and is then spread along the base-side support portion 5 in the direction opposite to the front end support portion 8.

  For this reason, the elastic force generated in the cover side support portion 11 acts in a direction in which the base side support portion 5 is pressed against the front end support portion 8. As a result, the rear end portion 4 b of the motor is pressed against the front end support portion 8 by the elastic force of the base side support portion 5 and the elastic force of the cover side support portion 11. Moreover, since the front-end | tip of the base side support part 5 is supported by the cover side support part 11, the rigidity of the base side support part 5 increases.

  In the conventional motor holding mechanism that presses the motor 4 only with the base-side support portion 5, if the elastic force of the base-side support portion 5 is reduced, the motor 4 can be easily fitted, but the motor is caused by external vibration or impact. When the elastic force is increased, the motor 4 is difficult to come off, but it is difficult to fit the motor 4, and it is difficult to apply an appropriate pressing force to the motor 4.

  However, in the motor holding mechanism of the embodiment, the elastic force acting on the motor 4 during the fitting operation of the motor 4 before the cover 2 is attached is only the elastic force by the base side support portion 5, but the cover 2 is attached. The rear motor 4 is pressed against the front end support portion 8 by the resultant force of the elastic force of the base side support portion 5 and the elastic force of the cover side support portion 11. For this reason, even if the elastic force of the base-side support portion 5 is reduced so that the motor 4 can be easily fitted, the elastic force of the cover-side support portion 11 is added after the cover 2 is attached, so The motor 4 can be firmly held by pressure. Moreover, since the cover side support part 11 of embodiment can be integrally formed with the resin-made covers 2, the number of parts of an actuator does not increase.

  FIG. 7 is a cross-sectional view showing another embodiment of the present invention. The motor holding mechanism according to another embodiment is different in that a thick portion is provided on the cover 2 instead of the plate-like cover side support portion 11 and the cover side support portion 14 is used. Also in other embodiments, since the pressing force at the time of mounting the motor 4 is only the elastic force of the base side support portion 5, the motor 4 can be easily fitted. When the cover 2 is attached, the position of the tip of the base side support portion 5 that has been spread out is regulated by the cover side support portion 14 and pushed back to the front end support portion 8 side. The base side support part 5 has a structure in which the tip is supported by the cover side support part 14 and the lower part is supported by the base plate 1, and the motor 4 is pressed against the front end support part 8. The motor 4 is firmly held.

  In the above embodiment, the actuator using the two worm gears as the speed reduction mechanism has been described. However, the configuration of the speed reduction mechanism is not limited to this. Further, if a taper is provided at the tip of at least one of the base side support part 5 or the cover side support parts 11, 14, the cover 2 can be easily attached to the base plate 1.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to embodiment, A various change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 1 Base plate 2 Cover 4 Motor 4a Motor front end 4b Motor rear end 4c Motor shaft 5 Base side support 6 Shaft support 7a, 7c Worm 8 Front end support 11, 14 Cover side support

Claims (4)

A motor having a shaft;
A base plate to which the motor is attached;
A cover attached to the base plate,
The shaft projects from the front end of the motor;
The base plate includes a front end support portion that regulates the position of the front end portion of the motor, a base side support portion having elasticity, and a shaft support portion.
The cover includes a cover side support portion having elasticity,
In the rotation axis direction of the motor, the base side support portion supports a rear end portion of the motor facing the base side support portion,
The motor is pressed against the front end support portion by the base side support portion and the cover side support portion,
A motor holding mechanism in which the shaft support portion supports a tip end portion of the shaft facing the shaft support portion in the rotation axis direction of the motor.   The motor holding mechanism according to claim 1, wherein the cover side support portion regulates a position of the base side support portion.   3. The motor holding mechanism according to claim 1, wherein the cover-side support portion is in contact with the base-side support portion facing the rear end portion of the motor in the rotation axis direction. A motor holding mechanism according to claim 1;
A worm fixed to the shaft;
A gear,
The gear is an actuator attached to the base plate.

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