JPH0580158U - Power unit motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a power unit motor capable of achieving a reduction ratio, a size reduction, a weight reduction, and a cost reduction as well as a significant reduction in noise. A power unit motor E comprising an electric motor 10 and a reduction mechanism 20 for reducing the output rotation of the electric motor 10, the reduction mechanism 20 having at least a first reduction means 30 and a second reduction means 40. Yes, first
The deceleration means 30 comprises a drive pulley 31 provided on the drive shaft 12 side of the electric motor 10 and a driven pulley 32 driven by the drive pulley 31 via a power transmission member 33. , A worm mechanism 41 linked to the output shaft 34 side of the first speed reducer 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power unit motor that reduces the output rotation of an electric motor by a reduction mechanism and transmits it to, for example, a vehicle seat reclining device, a seat lifter, or the like.

[0002]

[Prior Art]

 Conventionally, in a power unit motor, a worm and a worm wheel have been used as a reduction mechanism, and generally, the drive shaft of the electric motor and the worm shaft are provided on the same axis. In the case of a power unit motor in which the electric motor and the speed reduction mechanism are unitized and the two are later assembled together, the drive shaft and the worm shaft absorb the shaft misalignment and vibrations. It is known that the worm shaft and the worm shaft are connected by a bending joint.

Further, in the above power unit motor, in order to absorb the impact from the load during driving of the electric motor, a damper made of cushion rubber is provided between the worm wheel and its output shaft as cushioning means. ing.

[0004]

[Problems to be solved by the device]

 However, according to the above-mentioned power unit motor, it is necessary to provide a flexure joint, and it is not possible to obtain a sufficient reduction ratio with a single stage reduction of the worm and the worm wheel. Since it becomes a mold, there is a problem that it becomes large and heavy, and the cost becomes high.

Further, since the damper is provided on the worm wheel to which a large load is applied, there is a problem that the damper becomes large.

Therefore, the present applicant has filed an application for a power unit motor which solves the above-mentioned problems of the prior art in Japanese Patent Application No. 3-252149.

This invention is a further improvement of the power unit motor according to the above-mentioned Japanese Patent Application No. 3-252149. The object is to achieve downsizing, weight saving and cost reduction. It is to provide a power unit motor that can significantly reduce noise.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the power unit motor according to claim 1 of the present invention is a power unit motor including an electric motor and a speed reducing mechanism that reduces the output rotation of the electric motor. The first speed reducing means includes a drive pulley provided on the drive shaft side of the electric motor, and a driven pulley that is driven by the drive pulley via a power transmission member. Further, the second speed reducing means is characterized by being constituted by a worm mechanism linked to the output shaft side of the first speed reducing means.

Further, in the power unit motor of claim 2, the drive pulley and the driven pulley are constituted by toothed pulleys, and the power transmission member is constituted by a toothed belt.

Further, in the power unit motor of claim 3, the power transmission member is constituted by a plurality of O-rings arranged on the outer peripheral surfaces of the drive pulley and the driven pulley, and the rotation of the drive pulley is performed through the O-ring. Is characterized in that it is transmitted to the driven pulley.

Further, in the power unit motor according to the fourth aspect, the O-ring forming the power transmission member has the O-ring of one side adjacent to each other in the axial direction of the pulley when the drive pulley and the driven pulley are arranged close to each other. It is characterized in that both sides of the outer peripheral surface of the other O-ring are in contact with the opposing inner surface.

[0012]

[Action]

 The power unit motor of this invention has a two-stage speed reducing structure in which the second speed reducing means is linked to the output shaft side of the first speed reducing means, so that the conventional flexible joint is unnecessary and a large speed reducing ratio is achieved. Therefore, it is possible to use a high rotation, low torque type electric motor. As a result, it is possible to reduce the size, weight and cost of the power unit. Further, since the first speed reducing means is composed of the drive pulley, the driven pulley, and the toothed belt or the O-ring which is the power transmission member, the damper of the conventional product is unnecessary and the noise can be significantly reduced. it can.

[0013]

【Example】

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

1 to 5 relate to a first embodiment of the present invention, FIG. 1 is a front explanatory view of a power unit motor, FIG. 2 is an explanatory view showing a part of FIG. 1 cut away, and FIG. III-III arrow cross-sectional explanatory view of FIG. 4, FIG. 4 is a IV-IV arrow cross-sectional explanatory view of FIG. 2, and FIG. 5 is a front explanatory view of the output gear.

In the figure, E is a power unit motor, which is composed of 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 speed reduction mechanism 20 has at least a first speed reduction means 30 and a second speed reduction means 40, and the first speed reduction means 30 drives the drive shaft of the electric motor 10. 12 includes a drive pulley 31 provided on the 12 side and a driven pulley 32 that is driven by the drive pulley 31 via a power transmission member 33. The second reduction gear 40 is provided on the output shaft 34 side of the first reduction gear 30. It is composed of a worm mechanism 41 linked to the.

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 reducing mechanism 20 including first and second speed reducing means 30 and 40.

The first reduction means 30 comprises a small-diameter drive pulley 31 which is a toothed pulley, a large-diameter driven pulley 32 which is a toothed pulley, and a toothed belt 33 as a power transmission member. The pulley 31 is press fitted into the drive shaft 12 of the electric motor 10. Further, the driven pulley 32 is press-fitted into the two-face width portion 34a formed on the worm shaft 34 which is the output shaft of the first deceleration means 30 rotatably supported by the housing 11, and the toothed belt 33 is The drive pulley 31 and the driven pulley 32 are wound around the outer peripheral surfaces thereof.

The second deceleration means 40 includes a worm 42 that is a worm mechanism 41 and a worm wheel 43 that meshes with the worm 42. The worm 42 is integrally formed with the worm shaft 34. The worm wheel 43 is fixed to a worm wheel shaft 44 which is an output shaft of the second reduction gear 30 rotatably supported by the housing 11.

Reference numeral 50 denotes an output gear fixed to a worm wheel shaft. The output gear 50 is a vehicle seat 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 reclining device, it meshes with a reclining gear 51 of a Taumel mechanism.

Next, the operation of the first 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 50 via the drive pulley 31, toothed belt 33, driven pulley 32, worm 42 and worm wheel 43. The rotating force of the output gear 50 causes the reclining gear 51 to rotate, which causes the taumel mechanism to operate and adjust the inclination angle of the seat back.

By the way, in the power unit motor E of the present invention, the worm shaft 34, which is the output shaft of the first reduction gear 30, is integrally formed with the worm 42, which is a component of the second reduction gear 40, in a two-stage structure. Since the deceleration structure eliminates the need for a conventional bending joint, and also enables a large reduction ratio to be obtained, it is possible to use a high-rotation, low-torque electric motor 10 and also the worm mechanism 41. The diameter of the worm wheel 43 can be significantly reduced as compared with the conventional one. As a result, the power unit motor E can be made significantly smaller and lighter than before, and the cost can be reduced.

Further, since the first reduction means 30 is composed of the drive pulley 31, the driven pulley 32, and the toothed belt 33, the rotation of the electric motor 10 does not have to be aligned with the drive shaft 12 and the worm shaft 34. Since the power can be transmitted to the second speed reducer 40 and the first speed reducer 30 has a structure that doubles as a speed reducer and a joint, the electric motor 10 and the speed reducer can be more accurate than conventional ones. 20 installations can be performed.

Further, it is possible to significantly reduce noise as compared with the power unit motor according to Japanese Patent Application No. 3-252149 in which the first reduction gear 30 is a spur gear group. In addition, since the damper, which is a cushioning means, is not required, the cost can be further reduced.

Further, since the electric motor 10 and the reduction mechanism 20 can be separated as necessary, by changing the specifications of the electric motor 10, the power lifter, power window, power seat slide, power tilt, power telescopic It can also be applied to self-steering columns, etc., and is versatile.

It should be noted that the present invention is not limited to a vehicle, and can be used as a general power unit motor having a speed reduction mechanism.

6 to 9 relate to a second embodiment of the present invention, FIG. 6 is an explanatory view corresponding to FIG. 2, FIG. 7 is an enlarged explanatory view of a portion A of FIG. 6, and FIG. 8 is VIII- of FIG. FIG. VIII is a sectional view taken along the arrow VIII, and FIG. 9 is a sectional view taken along the line IX-IX in FIG.

In the second embodiment, a small diameter O-ring 33A and a large diameter O-ring 33B are used as the power transmission member 33, and the small-diameter O-ring 33A surrounds the outer peripheral surface of the drive pulley 31A. For example, the grooves 31a formed along the direction are press-fitted adjacent to each other, for example, in the three-axis direction. Further, the large-diameter O-ring 33B is press-fitted into the recessed groove 32a formed along the circumferential direction on the outer peripheral surface of the driven pulley 32A so as to be adjacent to each other, for example, in the two axial directions. When the drive pulley 31A and the driven pulley 32A are attached to the drive shaft 12 and the worm shaft 34 of the electric motor 10, respectively, the inner surface 33a of the large-diameter O-ring 33B faces the outer peripheral surface 33b of the outer surface 33b of the small-diameter O-ring 33B. Are arranged so that they contact each other.

According to the second embodiment, by using the O-rings 33A and 33B, the contact area can be increased and the transmission efficiency can be improved.

Other configurations and operations are similar to those shown in the first embodiment, and detailed description thereof will be omitted.

[0033]

[Effect of the device]

 As described above, according to the power unit motor of the present invention, since the two-stage speed reducing structure has the second speed reducing means linked to the output shaft side of the first speed reducing means, the bending joint of the conventional product is unnecessary, In addition, since a large reduction ratio can be obtained, it is possible to use a high rotation, low torque type electric motor. As a result, the size, weight and cost of the power unit motor can be reduced. Further, since the first speed reducing means is composed of the drive pulley, the driven pulley and the power transmission member, it is possible to significantly reduce noise as compared with the power unit motor in which the first speed reducing means is composed of the spur gear group.

[Brief description of drawings]

FIG. 1 is a front explanatory view of a power unit motor according to a first embodiment of 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.

4 is a cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a front explanatory view of an output gear.

FIG. 6 is an explanatory view corresponding to FIG. 2 according to a second embodiment of the present invention.

FIG. 7 is an enlarged explanatory view of a portion A in FIG.

FIG. 8 is a cross sectional view taken along the line VIII-VIII of FIG.

9 is a cross-sectional view taken along the line IX-IX of FIG.

[Explanation of symbols]

 E Power Unit Motor 10 Electric Motor 12 Drive Shaft 20 Reduction Mechanism 30 First Reduction Mechanism 31 Drive Pulley (Toothed Pulley) 31A Drive Pulley 32 Driven Pulley (Toothed Pulley) 32A Driven Pulley 33 Power Transmission Member (Toothed Belt) 33A O-ring 33B O-ring 33a Opposed inner surface 33b Outer peripheral surface both sides 34 Output shaft (worm shaft) 40 of the first speed reducing means 40 Second speed reducing means 41 Worm mechanism 42 Worm 43 Worm wheel 50 Output gear 51 Reclining gear

Claims (4)

[Scope of utility model registration request] 1. A power unit motor comprising an electric motor and a deceleration mechanism for decelerating the output rotation of the electric motor, wherein the deceleration mechanism has at least first and second deceleration means. The speed reducing means includes a drive pulley provided on the drive shaft side of the electric motor and a driven pulley that is driven by the drive pulley via a power transmission member, and the second speed reducing means corresponds to the first speed reducing means. A power unit motor comprising a worm mechanism linked to the output shaft side. 2. The power unit motor according to claim 1, wherein the drive pulley and the driven pulley are toothed pulleys, and the power transmission member is a toothed belt. 3. The power transmission member comprises a plurality of O-rings arranged on the outer peripheral surfaces of the drive pulley and the driven pulley, and the rotation of the drive pulley is transmitted to the driven pulley via the O-rings. The power unit motor according to claim 1, wherein: 4. The O-ring that constitutes the power transmission member is such that, when the drive pulley and the driven pulley are arranged close to each other, the O-ring on the other side is opposed to the inner surface of the O-ring on one side that is adjacent to each other in the axial direction of the pulley. 4. The power unit motor according to claim 3, wherein both sides of the outer peripheral surface of the power unit motor are in contact with each other.