JPH061903U - Vehicle motor actuator speed reducer - Google Patents

Abstract

(57) [Abstract] [Purpose] When the reduction gear group of the reduction gear transmission is supported by a case made of synthetic resin, creep deformation of the case due to stress from the reduction gear group is less likely to occur. A desired number of convex portions 21a to 21d are provided on one of the case 21 and the plate 22, and concave portions 22a to 21d are provided on the other.
22d is provided. The convex portions 21a to 21d are fitted into the concave portions 22a to 22d in a state where the case 21 and the plate 22 are assembled, and the rotational torque exerted on the case 21 by the reduction gear groups 23 to 29 is configured to be dispersed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a speed reducer of a vehicle motor actuator used for a vehicle seat posture control device or the like.

[0002]

[Prior art]

 2. Description of the Related Art Motor actuators for operating vehicle seats, windows, door locks, wipers, and the like have been conventionally known. This motor actuator had a reduction gear group in which gears were combined to reduce the rotation of the motor and obtain high torque. For example, Japanese Patent Application Laid-Open No. 62-46744 shows a wiper motor including a reduction gear group including a worm gear, an intermediate gear, a small diameter gear portion and a large diameter gear portion.

[0003]

[Problems to be solved by the device]

 By the way, a motor actuator used for a vehicle seat position control device or the like generates high torque by a reduction gear group, and thus, conventionally, the gear group was supported by a metal case and a plate. In order to meet the demand for weight reduction and cost reduction, a case made of synthetic resin is desired. However, when the motor actuator is locked or when a large load is applied, the reduction gear group gives a large rotational torque to the case, and the synthetic resin case receives stress. This causes creep deformation, resulting in an unstable support condition of the reduction gear group. In particular, the above-mentioned problems were prominent in a vehicle compartment or the like, which had a high temperature under hot summer in the summer.

[0004]

[Means for Solving the Problems]

 The present invention addresses the above-mentioned problems, and when supporting the reduction gear group with a case made of synthetic resin, it is an object of the present invention to prevent creep deformation of the case due to stress from the reduction gear group. And In order to achieve the above object, the present invention provides a speed reducer for a motor actuator for a vehicle, which supports a reduction gear group with a case made of synthetic resin and a plate made of metal. A vehicle motor actuator speed reducer characterized in that a desired number of convex portions are provided on the other side, and a concave portion is provided on the other side, and the convex portions are fitted into the concave portions in an assembled state of the case and the plate. .

[0005]

【Example】

 FIG. 1 is an exploded perspective view showing a preferred embodiment of the present invention, illustrating a motor actuator used in a seat attitude control device. In the figure, 1 is a motor, 2 is a reduction gear and 3 is a coupling, and the motor 1 and the coupling 3 are well known.

The speed reducer 2 will be described in detail. The reduction gear transmission 2 includes a case 21 and a plate 22, and a reduction gear group supported by the case 21 and the plate 22, that is, a worm 23, a worm wheel 24, a resin gear 25, a hard gear 26, an intermediate gear 27, and an output gear 28. And the output shaft 29. The above-described gears have a combination structure in which the rotation of the motor 1 is transmitted through the route of the worm 23 → the worm wheel 24 → the resin gear 25 → the hard gear 26 → the intermediate gear 27 → the output gear 28 → the output shaft 29, and then decelerated.

The case 21 is molded from a synthetic resin such as nylon and has four protrusions 21a to 21d as shown in FIG. On the other hand, the plate 22 is made of a metal such as iron and has four recesses 22a to 22d as shown in FIG. The convex portions 21a to 21d and the concave portions 22a to 22d are provided in the middle of each tightening position of the screw 4 for assembling the case 21 and the plate 22. The protrusions 21a to 21d may be formed, for example, by processing one side 21e into a slightly obtuse shape as shown in FIG.

Further, the worm wheel 24 and the resin gear 25 are integrally molded of synthetic resin such as reinforced nylon. The hard gear 26 is made of a metal material such as free-cutting steel.

The motor actuator configured as described above operates as follows. The motor 1 receives an exciting current from a seat controller (not shown), a seat operation switch (not shown), etc. and rotates. This rotational torque is transmitted to the worm 23 via the coupling 3 and converted into high torque by the worm wheel 24, the resin gear 25, the hard gear 26, the intermediate gear 27 and the output gear 28. This high torque is transmitted from the output shaft 29 to a seat posture control mechanism (not shown) to actuate a lifter, a slider or the like of the seat to adjust the seat posture to a desired posture.

However, when the exciting current is continuously supplied to the motor 1, the seat control mechanism eventually reaches the control limit point, and the motor 1 and the reduction gear 2 are in a so-called locked state. In this case, the reduction gear groups 23 to 29 give a large rotational torque to the case 21. However, since this rotational torque is dispersed by the convex portions 21a to 21d and the concave portions 22a to 22d, stress is not concentrated, and therefore the case 21 is less likely to undergo creep deformation.

[0011]

[Effect of device]

 According to the present invention, the case and plate of the speed reducer are provided with a desired number of protrusions and recesses, and the protrusions and recesses are fitted to disperse the rotational torque exerted on the case by the reduction gear group. The motor and speed reducer are locked, and the case does not undergo creep deformation even if a large load is applied. The present invention is an effective technology for a motor actuator used in a passenger compartment, which has a high temperature under hot summer in the summer.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of the present invention.

FIG. 2 is a detailed perspective view of a main part of the one shown in FIG.

FIG. 3 is a side view showing a main part in the direction of arrow A shown in FIG.

[Explanation of symbols]

 1 Motor 2 Speed reducer 3 Coupling 21 Case 22 Plate 21a, 21b, 21c, 21d Convex part 22a, 22b, 22c, 22d Recessed part

Claims (1)

[Scope of utility model registration request] 1. A speed reducer for a motor actuator for a vehicle, wherein a reduction gear group is supported by a case made of synthetic resin and a plate made of metal, wherein a desired number of convex portions are provided on either one of the case and the plate. A decelerator for a motor actuator for a vehicle, characterized in that a recess is provided on the other side, and the projection is fitted into the recess in an assembled state of the case and the plate.