JPH0687360A - Power transmission device for electric motor - Google Patents

Abstract

PURPOSE:To make the various movement adjustments of a vehicle power seat simply with a single electric motor. CONSTITUTION:An output shaft 2 of an electric motor 1 is connected to a drive shaft 4 through a universal joint means 3, and a movable bearing 7 to pivotally support the other end of the drive shaft is connected to first and second solenoids 8 and 9 which moves selectively the movable bearing in vertical and lateral directions, so that the drive shaft can be moved vertically and laterally to the shift positions. Also follower gears 11 to 14 are arranged in the shift positions of the drive shaft, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for an electric motor mounted on a power seat of a vehicle such as a private car or a truck.

[0002]

BACKGROUND OF THE INVENTION Generally,
In order to match the physique and posture of the occupant, there are seats in which the entire seat is moved forward and backward, the backrest is tilted up and down, and the front and rear half of the seat is vertically adjusted. Then, it is attempted to automatically perform such adjustment using an electric motor. However, performing these various movement adjustments using dedicated electric motors increases the number of electric motors accordingly, and the number of parts also increases, which is not contradictory to weight reduction and is costly. Was also a problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of providing a power transmission device for an electric motor capable of eliminating these drawbacks in view of the above circumstances. In transmitting power based on forward / reverse drive of a motor, the output shaft of the electric motor is connected to one end of a drive shaft provided with a drive gear via a universal joint means, and the other end of the drive shaft is connected. A movable bearing rotatably rotatably supported is connected to bearing moving means for selectively moving in the vertical and horizontal directions, and the drive shaft is shifted in each of the vertical and horizontal shift positions based on the selective movement operation of the bearing moving means. It is characterized in that it is configured to be displaceable to each other, and that each shift position of the drive shaft is provided with a driven gear that meshes with the drive gear displaced to the corresponding shift position.

According to the present invention, various movement adjustments of the seat can be surely performed by one electric motor.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is an electric motor for a power seat arranged in a vehicle such as a private car or a truck,
One end of a drive shaft 4 is interlockingly connected to an output shaft 2 of the electric motor 1 through a universal joint means 3 capable of transmitting power in a bent state. A centering bearing 5 is rotatably supported on the body side. On the other hand, reference numeral 6 denotes a guide body integrally provided on the body side, and a guide cylinder 6a formed in the guide body 6 in a vertical and horizontal crank shape has a bearing cylindrical body 7a protruding from the movable bearing 7. Are movably fitted along the guide groove 6a. The other end of the drive shaft 4 is rotatably supported by the bearing cylinder 7a.

Further, 8 and 9 are bearing moving means 10 of the present invention.
Of the first and second actuating wires 8a and 9a drawn from the respective solenoids 8 and 9, the first actuating wire 8a is the movable bearing 7
The second actuating wire 9a is connected to the lower surface of the movable bearing 7, and the first solenoid 8 appears and disappears (ON
The movable bearing 7 is moved and displaced in the lateral direction by the operation of (-OFF), and the movable bearing 7 is displaced and moved in the vertical direction by the operation of retracting and retracting the second solenoid 9. Then, in the embodiment, as shown in FIG. 6, when both solenoids 8 and 9 are both OFF and both operating wires 8a and 9a are retracted, the movable bearing 7 is located at the first shift position, When both solenoids 8 and 9 are both ON and both operating wires 8a and 9a are protruding, the movable bearing 7 is located at the second shift position, and when the first solenoid 8 is ON and the second solenoid 9 is OFF. The movable bearing 7 is located at the third shift position, and when the first solenoid 8 is off and the second solenoid 9 is on, the movable bearing 7 is set to the fourth shift position. The ON / OFF switching of the solenoids 8 and 9 and the forward / reverse driving of the electric motor 1 are set so that they can be selectively performed by an operation switch (not shown) arranged in the driver's seat, for example. However, the forward / reverse driving of the electric motor 1 is set so as to be delayed after the switching of the solenoids 8 and 9 based on the switching operation of the operation switch. Therefore, the drive circuit of the electric motor 1 is appropriately driven. A delay circuit is provided.

On the other hand, 11 to 14 are worm gears (corresponding to the drive gear of the present invention) 4a provided integrally with the drive shaft 4.
First to fourth worm wheels (corresponding to the driven gears of the present invention) which are disposed so as to face each other, the first worm wheel 11 is used when the drive shaft 4 is shifted to the first shift position. The worm gear 4a is meshed with the second worm wheel 12 when the second worm wheel 12 shifts to the second shift position, and the third worm wheel 13 shifts to the third shift position. The wheels 14 are set so that the worm gears 4a selectively mesh with each other when shifting to the fourth shift position. In the embodiment, the wheel shaft 15 of the first worm wheel 11 has the seat back portion 19
Power is transmitted to adjust the tilting of a, the wheel shaft 16 of the second worm wheel 12 is transmitted to adjust the vertical movement of the seat front half 19b, and the third worm wheel 13 is rotated.
The wheel shaft 17 of the vehicle is power-transmitted so as to adjust the vertical movement of the seat rear half portion 19c, and further, the fourth worm wheel 14
The wheel shaft 18 is configured to be power-transmitted so as to adjust the front-back movement of the entire seat 19. Incidentally, in the embodiment, since the first wheel shaft 11 is oriented in the vertical direction, the first wheel shaft 11 is converted to the horizontal axis direction via the bevel gear mechanism 15a on the way, whereby the upright operation of the backrest portion 19a is performed. Done,
Since the second wheel shaft 16 is oriented in the vertical direction, the link operation is performed as it is to adjust the vertical movement of the seat front half portion 19b, and the third wheel shaft 17 is oriented in the horizontal direction. The vertical conversion is performed via the mechanism 17a to perform the link operation to adjust the vertical movement of the seat rear half portion 19c. Since the fourth wheel shaft 18 is oriented in the lateral direction, the fourth wheel shaft 18 is directly extended as a screw shaft. Then, the nut member 20 fixed to the body side is screwed into this, and the forward and backward movement of the entire seat is adjusted by the relative forward and backward movement of the nut member 20 accompanying the forward and reverse rotation of the fourth wheel shaft 18. Is set.

In the embodiment of the present invention configured as described above, the seat 19 is moved forward and backward, the seat front and rear half portions 19 are moved.
When it is desired to move the b and 19c up and down, and further to move the backrest 19a up and down, by operating the operation switch correspondingly, the first and second solenoids 8 and 9 can perform the switching. Correspondingly, withdrawal operation is performed, whereby the drive shaft 4 shifts to the corresponding shift position to, and the worm gear 4a meshes with the corresponding worm wheel 11 to 14, whereby the necessary movement of the seat portion is performed. Adjustments will be made.

As described above, in the embodiment of the present invention, four kinds of driving can be conveniently performed by the output from one electric motor 1. As a result, the electric motor can be driven as in the conventional case. There is no need to prepare for each type. As a result, the number of parts can be significantly reduced, and it is not possible to make a great contribution to weight reduction, and also significant cost reduction can be achieved.

Further, in this structure, the drive shaft 4 connected to the motor output shaft 2 via the universal joint mechanism 3 is shifted in the vertical and horizontal directions to selectively interrupt the power transmission, and therefore the intermittent clutch. The structure of the mechanism is simplified, and the number of solenoids 8 and 9 constituting the bearing moving means is half the number of drive types, which is advantageous in that the weight and cost can be further reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and both solenoids 8 constituting the bearing moving means,
If 9 is set to the OFF first shift position so that the seat is moved back and forth, even if both solenoids become inoperable, only the seat back and forth will move. Has the advantage that the driver's foot is stuck to the pedal, and that the driver's foot is stuck on the driving panel and the driver cannot be inoperable due to the inability to operate the pedal. .

Further, when both solenoids constituting the bearing moving means are of a three-stage switching type of immersion (first ON) -neutral (OFF) -projection (second ON), the drive shaft 4 is It is possible to shift in a vertical and horizontal cross-shape, and shift movement corresponding to this is possible, and in this case, there is an advantage that a neutral position in which the drive gear 4a does not mesh with any of the driven gears 11 to 14 can be secured. is there. Further, the bearing moving means is not limited to the solenoid but may be an electric motor.

[0013]

In summary, since the present invention is constructed as described above, the drive shaft of the electric motor is displaced to each shift position in the vertical and horizontal directions by operating the bearing moving means, Since the drive shaft is meshed with a driven gear at each shift position to transmit power, for example, when this power transmission device is used for a vehicle power seat, various movement adjustments of the seat are controlled by the output of one electric motor. Can be driven. Therefore, unlike the conventional case, it is not necessary to prepare an electric motor of the number corresponding to the drive location one by one, and the number of parts can be reduced, which is a great contribution to weight reduction. You can also achieve cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat.

FIG. 2 is a perspective view of bearing moving means.

FIG. 3 is an explanatory diagram of a first worm wheel.

FIG. 4 is an explanatory diagram of a third worm wheel.

FIG. 5 is an explanatory diagram of a second worm wheel.

FIG. 6 is a table showing a relationship between an operation of a solenoid and a shift position of a movable bearing.

FIG. 7 is an operation explanatory view showing each shift position of the drive shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 electric motor 2 output shaft 4 drive shaft 4a drive gear 7 movable bearing 10 bearing moving means 11 driven gear 12 driven gear 13 driven gear 14 driven gear

Claims (1)

[Claims] 1. When transmitting power based on forward and reverse drive of an electric motor, an output shaft of the electric motor is connected to one end of a drive shaft provided with a drive gear via a universal joint means, and the drive is performed. A movable bearing, which rotatably supports the other end of the shaft, is connected to a bearing moving unit that selectively moves in the vertical and horizontal directions, and the drive shaft is moved based on the selective moving operation of the bearing moving unit. It is configured such that it can be displaced to each shift position in the vertical and horizontal directions, and each of the shift positions of the drive shaft is provided with a driven gear that meshes with the drive gear displaced to the corresponding shift position. Power transmission device for electric motors.