JPH0584119A - Power unit motor for vehicle - Google Patents

Abstract

PURPOSE:To provide a power unit motor for vehicle with a sufficiently ensured reduction gear ratio, being small and lightweight and prepd. with a low cost. CONSTITUTION:The title motor is a power unit motor E for vehicle consisting of a motor 10 and a reduction mechanism 20, which is constituted by providing the first speed reduction means 30 consisting of a group of flat gears on the driving shaft 11 of the motor 10 and by connecting the output shaft 33 of this first speed reduction means 30 with the second speed reduction means 40 consisting of a worm mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power unit motor for reducing the output rotation of an electric motor by a reduction mechanism and transmitting the output rotation to a seat reclining device, a seat lifter and the like.

[0002]

2. Description of the Related Art Conventionally, in a power unit motor for a vehicle, a worm and a worm wheel are used as a reduction mechanism, and it is common that the drive shaft of the electric motor and the worm shaft are provided on the same axis. Target. Then, the electric motor and the reduction mechanism are each unitized,
In the case of a power unit motor that is later assembled together, it is known that the drive shaft and the worm shaft are connected by a flexible joint in order to absorb misalignment and vibration between the drive shaft and the worm shaft. ing.

Further, in the above power unit motor, in order to absorb a shock from the load side while the electric motor is being driven, a damper made of cushion rubber which is a buffer means is provided between the worm wheel and its output shaft. It is provided.

[0004]

However, according to the power unit motor for a vehicle described above, it is necessary to provide a bending joint, and it is not possible to obtain a sufficient reduction ratio by a single stage deceleration of the worm and the worm wheel. The motor is inevitably a low-rotation, high-torque type, and therefore there is a problem that the motor 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.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to secure a sufficient reduction gear ratio, and to make the power unit for a vehicle compact, lightweight and low cost. To provide a motor.

[0007]

In order to achieve the above object, a vehicle power unit motor according to claim 1 of the present invention is a vehicle power unit motor comprising an electric motor and a speed reduction mechanism, wherein the speed reduction mechanism is The drive shaft of the electric motor is provided with a first speed reducing means including a spur gear group,
It is characterized in that the output shaft of the first speed reducing means is connected to the second speed reducing means composed of a worm mechanism.

The vehicle power unit motor according to a second aspect of the invention is characterized in that a buffer means is disposed between the first speed reducing means and the second speed reducing means.

[0009]

In the vehicle power unit motor of claim 1,
Since the two-stage speed reduction structure is formed by connecting the second speed reduction means to the output shaft of the first speed reduction means, the conventional flexible joint is unnecessary. This makes it possible to reduce the size and weight of the vehicle power unit and reduce the cost. Further, it is possible to use a high-rotation, low-torque electric motor, and it is possible to reduce the size of the electric motor.

Further, in the power unit motor for a vehicle according to the second aspect, since the buffering means is provided in the first speed reducing means which does not receive a relatively large load, the buffering means can be downsized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a front explanatory view of a vehicle power unit motor, FIG. 2 is an explanatory view showing a part of FIG. 1 broken away, FIG. 3 is a sectional explanatory view of a gear provided with a cushioning means, and FIG. It is a schematic front explanatory drawing of the seat reclining device which applies the power unit motor for vehicles.

In the figure, E is a vehicle power unit motor, which comprises an electric motor 10 and a reduction mechanism 20.

The present invention is particularly applicable to the speed reduction mechanism 20.
The drive shaft 11 of the electric motor 10 is provided with a first speed reducer 30 composed of a spur gear group, and a worm shaft 33 which is an output shaft 10 of the first speed reducer 30 is provided with a second speed reducer including a worm mechanism. It is characterized in that 40 is connected.

Further, a damper 50 made of cushion rubber, which is a cushioning means, is arranged between the first speed reducing means 30 and the second speed reducing means 40.

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

The electric motor 10 is detachably attached to a housing 21, and the housing 21 is provided with a speed reduction mechanism 2 including a first speed reduction means 30 and a second speed reduction means 40.
0 is installed.

The first reduction means 30 comprises a small-diameter spur gear 31 which is a group of spur gears, and a large-diameter spur gear 32 which meshes with the small-diameter spur gear 31, and the small-diameter spur gear 31.
Are press-fitted into the drive shaft 11 of the electric motor 10. The large-diameter spur gear 32 is attached to the worm shaft 33 via a damper 50 press-fitted into the worm shaft 33. The worm shaft 33 has ball bearings 34 at both ends thereof.
A ball bearing 34, which is rotatably supported by a steel ball 35 accommodated therein, on the side opposite to the large-diameter spur gear 32, has a cushion 36 made of a rubber-like elastic body for absorbing axial play. Are arranged adjacent to each other.

The second deceleration means 40 comprises a worm 41 which is a worm mechanism and a worm wheel 42 which meshes with the worm 41. The worm 41 is formed integrally with the worm shaft 33. The worm wheel 42 is fixed to a worm wheel shaft 43 rotatably supported by the housing 21.

S is a seat reclining device to which the vehicle power unit E according to the present invention is applied. An arm 71 mounted on the seat back side of the base plate 70 mounted on the seat cushion side has a planetary gear type angle. It is pivotally supported via a Taumel mechanism 72 which is an example of an adjusting mechanism. The taumel mechanism 72 is a well-known matter, and its detailed description is omitted.

The vehicle power unit E is attached to the arm 71, and the drive gear 60 fixed to the worm wheel shaft 43 is meshed with the reclining gear 73 of the taumel mechanism 72.

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

When the electric motor 10 is rotated to tilt the seat back, the driving force of the electric motor 10 is transmitted to the driving gear 60 via the spur gears 31, 32, the worm 41, and the worm wheel 42. The reclining gear 73 is rotated by the rotational force of the drive gear 60, whereby the taumel mechanism 72 is operated, the tilt angle of the arm 71 is changed, and the seat back can be adjusted to the forward leaning posture or the backward leaning posture.

By the way, in the vehicle power unit motor E of the present invention, a two-stage speed reducer in which the worm shaft 33 which is the output shaft of the first speed reducer 30 and the worm 41 which is a component of the second speed reducer 40 are integrally molded. Since the structure is adopted, the bending joint of the conventional product is not required, and the diameter of the worm wheel 42 of the worm mechanism can be significantly reduced as compared with the conventional one. As a result, the vehicle power unit E can be reduced in size and weight, and the cost can be reduced. Further, since a large reduction ratio can be obtained, it is possible to use the high rotation, low torque type electric motor 10, and the electric motor 10 can be downsized.

In addition, what is shown by a virtual line in FIG.
This is the conventional vehicle power unit E _1, which is larger than the vehicle power unit E according to the present invention shown by the solid line.

Further, since the damper 50, which is a buffering means, is provided on the spur gear 32 which is a component of the first speed reducing means 30 to which a relatively large load is not applied, the damper 50 can be miniaturized.

Further, the electric motor 10 and the speed reduction mechanism 20 can be separated from each other as necessary, so that the electric motor 1
By changing the specification of 0, it can be applied to power lifters, power windows, etc., and is versatile.

The present invention is not limited to a vehicle, but a general power unit motor having a speed reduction mechanism,
It can also be used as a power seat slide, power tilt, and power telescopic steering column.

[0029]

As described above, according to the vehicle power unit motor of claim 1 of the present invention, since the two-stage speed reducing structure is adopted, the bending joint of the conventional product becomes unnecessary. As a result, it is possible to reduce the size and weight of the vehicle power unit and reduce the cost. Further, it is possible to use a high-rotation, low-torque electric motor, and it is possible to reduce the size of the electric motor.

Further, according to the vehicle power unit motor of the second aspect, since the buffering means is provided in the first speed reducing means where a relatively large load is not applied, the buffering means can be downsized.

[Brief description of drawings]

FIG. 1 is a front explanatory view of a vehicle power unit motor according to the present invention.

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

FIG. 3 is a cross-sectional explanatory view of a spur gear provided with a cushioning means.

FIG. 4 is a schematic front explanatory view of a seat reclining device to which a vehicle power unit motor according to the present invention is applied.

[Explanation of symbols]

E Vehicle power unit S Seat reclining device 10 Electric motor 20 Reduction mechanism 30 First reduction means 31 Small diameter spur gear 32 Large diameter spur gear 33 Output shaft (worm shaft) 40 of first reduction means 40 Second reduction means 41 Worm 42 Worm Wheel 43 Output Shaft of Second Speed Reduction Means (Worm Wheel Shaft) 50 Buffer Means 70 Base Plate 71 Arm 72 Planetary Gear Type Angle Adjustment Mechanism (Taumel Mechanism) 73 Reclining Gear

Claims (2)

[Claims] 1. A power unit motor for a vehicle comprising an electric motor and a speed reduction mechanism, wherein the speed reduction mechanism is provided with a first speed reduction means composed of a spur gear group on a drive shaft of the electric motor, and the first speed reduction mechanism is provided. A power unit motor for a vehicle, characterized in that the output shaft of the means is connected to a second speed reducing means composed of a worm mechanism. 2. A power unit motor for a vehicle according to claim 1, wherein a buffer means is arranged between the first speed reducer and the second speed reducer.