JPH0580157U - Power unit motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a power unit motor that can be reduced in size, weight, and cost, and can significantly reduce noise. [Structure] A power unit motor E of the present invention comprises an electric motor 10 and a reduction mechanism 20 for reducing the output rotation of the electric motor 10. In this invention, in particular, the reduction mechanism 20 includes a first worm mechanism 30 linked to the drive shaft side of the electric motor 10 and a second worm mechanism linked to the output shaft side of the first worm mechanism 30 at right angles. It is characterized by having a worm mechanism 40.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power unit motor including an electric motor and a reduction mechanism that reduces the output rotation of the electric motor.

[0002]

[Prior Art]

 Conventionally, in a power unit motor, the output rotation of an electric motor is decelerated by a reduction mechanism and transmitted to, for example, a vehicle seat reclining device, a seat lifter, or the like. Further, a spur gear group or a worm mechanism including a worm and a worm wheel is used as a reduction mechanism.

[0003]

[Problems to be solved by the device]

 However, the power unit motor using the spur gear group has a problem that noise is generated because the electric motor rotates at high speed.

In addition, in the power unit motor using the worm mechanism, it is not possible to obtain a sufficient reduction ratio because it is a one-step reduction, so it is necessary to make the electric motor a low rotation and high torque type. However, there is a problem that the cost will increase with the increase in weight.

The present invention has been made to solve the above-mentioned problems of the prior art, and provides a power unit motor that can be reduced in size, weight, and cost, and can significantly reduce noise. Especially.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the power unit motor of the present invention comprises an electric motor and a speed reducing mechanism for reducing the output rotation of the electric motor. The speed reducing mechanism is a first shaft linked to the drive shaft side of the electric motor. This worm mechanism is provided with a second worm mechanism that is orthogonal to and linked to the output shaft side of the first worm mechanism.

[0007]

[Action]

 Since the power unit motor of this invention has the two-stage speed reduction structure using the first and second worm mechanisms, a large reduction ratio can be obtained, so that a high-speed, low-torque electric motor can be used. .. This makes it possible to reduce the size, weight and cost of the power unit. Furthermore, noise can be significantly reduced.

[0008]

【Example】

 The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a front explanatory view of a power unit motor, FIG. 2 is an explanatory view showing a part of FIG. 1 broken away, FIG. 3 is a sectional view taken along the line III-III of FIG. It is a front explanatory view.

In the figure, E is a power unit motor, which is composed of an electric motor 10 and a speed reduction mechanism 20 for decelerating the output rotation of the electric motor 10.

In this invention, in particular, the reduction gear mechanism 20 is orthogonal to the first worm mechanism 30 linked to the drive shaft 12 side of the electric motor 10 and the output shaft 34 side of the first worm mechanism 30. It is characterized in that it has a second worm mechanism 40 associated therewith.

Next, the structure of the present invention will be described in more detail.

The electric motor 10 is detachably attached to the housing 11, and the housing 11 is provided with a speed reducer mechanism 20 including a first worm mechanism 30 and a second worm mechanism 40.

The first worm mechanism 30 includes a first worm 31 and a first worm wheel 32 that meshes with the first worm 31, and the first worm 31 is a drive shaft of the electric motor 10. It is integrally formed with a worm shaft 34 that is an output shaft of the first worm mechanism 30 that is connected to 12 via a coupling 33. The first worm wheel 32 is integrally formed with a worm wheel shaft 35 which is orthogonal to the worm shaft 34 and is rotatably supported by the housing 11.

The coupling 33 is supported by a bearing 36 provided on the housing 11.

The second worm mechanism 40 includes a second worm 41 and a second worm wheel 42 that meshes with the second worm 41. The second worm 41 is integrated with the worm wheel shaft 35. It is molded. Further, the second worm wheel 42 has boss portions 42a and 42b formed on both sides thereof so as to project from both side surfaces, and one boss portion 42a is orthogonal to the worm wheel shaft 35 and is rotatable with respect to the housing 11. The boss portion 42b is press-fitted into a recess 43a formed at the end of the output shaft 43 of the second worm mechanism 40 supported by the second worm mechanism 40, and the other boss portion 42b is fitted into the bush 44 provided in the housing 11.

Reference numeral 50 denotes an output gear fixed to the output shaft 43. The output gear 50 is a vehicle having the power unit motor E according to the present invention, for example, a Taumel mechanism which is an example of a planetary gear type angle adjusting mechanism. When applied to a seat reclining device, it is linked to a tumbler mechanism.

Next, the operation of the embodiment of the present invention will be described.

When the electric motor 10 is rotated, the rotational power of the electric motor 10 is transmitted to the output gear via the first worm 31, the first worm wheel 32, the second worm 41, and the second worm wheel 42. 50 is transmitted. The rotational force of the output gear 50 activates the Taumel mechanism to adjust the tilt angle of the seat back. By the way, in the power unit motor E of the present invention, since the reduction gear mechanism 20 has the two-stage reduction gear structure composed of the first and second worm mechanisms 30 and 40, a large reduction ratio can be obtained, so that high rotation and low torque can be obtained. The electric motor 10 of the mold can be used, and the diameters of the worm wheels 32 and 42 of the worm mechanisms 30 and 40 can be significantly reduced as compared with the conventional one. As a result, the power unit motor E can be made much smaller and lighter than the conventional one, and the cost can be reduced. Further, when the present invention is applied to a vehicle seat reclining device having a taumel mechanism, the power unit motor can directly actuate the taumel mechanism, which eliminates the need for a conventional pinion gear and reclining, further reducing the cost.

Further, noise can be significantly reduced as compared with a conventional power unit motor including a spur gear group.

[0021]

[Effect of the device]

 As described above, according to the power unit motor of the present invention, since the reduction gear mechanism has the two-stage reduction gear structure including the first and second worm mechanisms, it is possible to obtain a large reduction gear ratio. It becomes possible to use the electric motor. As a result, the size, weight and cost of the power unit motor can be reduced. In addition, noise can be significantly reduced compared to the conventional power unit motor composed of spur gears.

[Brief description of drawings]

FIG. 1 is a front view showing a power unit motor according to the present invention.

FIG. 2 is an explanatory view showing a part of FIG. 1 broken away.

3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a front explanatory view of an output gear.

[Description of Reference Signs] E power unit motor 10 electric motor 12 drive shaft 20 reduction mechanism 30 first worm mechanism 31 first worm 32 first worm wheel 34 first worm mechanism output shaft (worm shaft) 35 worm wheel Shaft 40 Second Worm Mechanism 41 Second Worm 42 Second Worm Wheel 43 Output Shaft 50 Output Gear

Claims (1)

[Scope of utility model registration request] 1. A power unit motor comprising an electric motor and a speed reduction mechanism for reducing output rotation of the electric motor, wherein the speed reduction mechanism includes a first worm mechanism linked to a drive shaft side of the electric motor, A power unit motor having a second worm mechanism that is linked orthogonally to the output shaft side of the first worm mechanism.