JPS60100913A - Drive apparatus of electromotive reclining seat - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industry - (Second Field of Application)) The present invention relates to a drive device for an electric reclining seat i, and particularly relates to an improvement in a drive method.

(Prior Art) An electric reclining automobile seat is known in which a back portion of the seat is tilted and moved around one end of the seating portion of the seat.

FIG. 1 shows a schematic configuration of a conventional electric reclining seat drive device. When a forward/reverse motor 3 mounted on the seat back 2 side in FIG. 1 rotates, three reduction gears 4a
, 4b, and 4C, the driving force is transmitted to the rotating gear 5.

The rotating gear 5 is pivotally supported by a seat back bracket 6, and the seat bank bracket 6 is pivotally supported by a seat cushion bracket 7.

Further, the rotating gear 5 is arranged to rotate around a fixed gear 9 attached to the seat cushion 8.

Therefore, the seat puncture bracket 6 also rotates in conjunction with the rotation gear 5, and the seat puncture 2 attached to the seat puncture bracket 6 also rotates in the backward or forward tilt direction J. .

When a person sits on such an electric reclining seat), the user pushes the upper body or back of the seater t1, so there is a difference in the torque required of the motor during forward tilting movement and backward tilting movement.

In other words, when a large person leans on the seat and tilts the dorsal part forward from the last tilted state, the drive motor needs a large torque to overcome the load of the occupant's body. During backward tilting movement, the load from the occupant's upper body is added to the i-lux of the drive motor, so less torque is sufficient.

Due to this phenomenon, the torque of the drive motor is limited to a level that does not cause any danger even if the legs of a rear seat passenger are pushed by the back of the front seat, so if a large person is seated in the front seat, the torque of the drive motor will cause forward tilt movement. There was a problem that there was a shortage of

(Purpose of the Invention) This invention was achieved in an attempt to eliminate the drawbacks of the prior art described below, and it is safe even when the dorsal part is tilted backwards, and it can ensure a 1-min. Object 1-1 is to provide a driving device for an electric reclining seat.

(Structure of the Invention) In order to achieve the first object, the present invention provides a drive motor for tilting the back portion of the seat centering on the rear portion of the seating portion, and a unidirectional current applied to the motor. A first current path for causing the dorsal side portion to tilt forward and a second current path for flowing current in the other direction to the motor and causing the dorsal side portion to tilt backward. In the drive device, each of the current paths includes a circuit breaker, and the circuit breaker in the second current path is opened with a smaller current than the circuit breaker in the first current path. do.

(Effects of the Invention) With the above configuration, according to the present invention, it is possible to provide an electric reclining seat drive device that has the following effects.

(1) By making the second current path circuit breaker open with a smaller current than the first current path circuit breaker,
If the back portion hits the legs of a rear seat occupant and an overcurrent flows, the second current path circuit breaker opens and the motor stops. Therefore, the safety of the passengers in the rear seats is ensured.

(2) By using drive motors with different torques during iE reverse rotation, the effect of the previous item (1) becomes even more remarkable.

(3) Furthermore, even if a high-torque motor is used, the safety of rear seat occupants is ensured, and the high torque allows for faster movement speeds, making it possible to quickly adjust the seat position to an appropriate position. It also has the effect of

(Example of the invention) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows an embodiment of the present invention, in which the polarity of the power supplied to the drive motor 1O is changed by a manual switch 11 to change the direction of tilting movement of the back portion of the seat.

The drive motor lO is a DC motor, with three brushes lo
a, 10b, and 10c. Current supply is by brush lo
A, 1ob combination or a combination of brushes lOa, 10c are used, but the latter has smaller torque when driven by the same power source.

The switch 11 has two interlocking contacts SWI and SW2, and in the illustrated state drives the motor 10 to tilt the dorsal portion rearward.

That is, in order to excite the relay 14 via the contact SWI, the contact of the relay 14 is closed, and the contact SW2 and the relay 14 are closed.
The positive pole of the current is connected to the brush 10c of the motor 10 through the contact. Further, since the relay 15 has a normally closed contact, the negative station of the power source is connected to the brush 10a of the motor 10 via the circuit breaker 12, 13, the contact of the relay 15, and the limit switch 17. At this time, the relay 16 also has contact S
WI, the normally closed contact opens due to excitation through the limit switch 17.

Here, as mentioned above, the brushes 10a of the motor lO, lO
Combination c has a small torque, and the circuit breaker 13 is set to open with a smaller current than the circuit breaker 12. Therefore, when the back side of the seat tilts backward, if the force that prevents this interlock movement moves f, the rotational speed of the motor decreases and the current flowing through this circuit increases.

If this current value exceeds the set value of the circuit breaker 13, the circuit breaker 13
is opened and the motor 10 is stopped.

As can be seen from below, switch 11. Relay 14, circuit breaker 12, 13. Sl/-15, limit switch 17
etc., form a second current path for supplying a unidirectional current to the motor 10 and tilting the dorsal portion rearward.

Furthermore, when the switch 11 is turned in the opposite direction as shown, the motor 10 is driven so as to tilt the back side portion forward.

That is, relay 1 is connected via contact SWI of switch 11.
5 is energized and the contact opens. Also, since both relays 14 and 16 are not energized, the contacts of relay 14 are open and the contacts of relay 16 are closed, respectively.

Therefore, the brush l is connected via the contact SW2 and the circuit breaker 12.
The positive pole of the power supply is connected to oa, and the brush lOb is connected to the negative pole of the power supply via the contact point 16 and the limit switch 17.

Here, as mentioned above, the brushes 10a and lo of the motor lO
Combination b has a large torque, and the circuit breaker 12 is set so that it opens only with a current larger than that of the circuit breaker 13. That is, when the back side of the seat is tilted forward, the circuit breaker 12 is set not to open in a normal seating state.

As can be seen from the above, switch 11. Circuit breaker 12, relay 16. and the limit switch 17, etc., are connected to the motor 10.
A first current path is formed for supplying a current in the other direction to cause the dorsal portion to tilt forward.

The limit switch 17 includes fixed contacts 17a, 17b, and 17c arranged at regular intervals and a movable contact 17d that moves in accordance with the rotation of the motor 10 and the movement of the back side of the seat.
and defines a range in which the dorsal portion can be electrically moved, and stops the motor lO outside of this range.

This invention is not limited to the embodiments described above, but includes various modifications as long as the object of the invention can be achieved. For example, the drive motor may have a torque that does not change during forward and reverse rotation. Good too. In addition, the torque can be changed when the drive motor rotates in forward or reverse directions, either electrically, such as by inserting a resistor into the armature circuit, or mechanically, such as by changing the frictional resistance of the motor's rotating shaft between forward and reverse rotations. be able to.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of an electric reclining seat, and FIG. 2 is a system diagram of one embodiment of the present invention. lO... Drive motor, 11... Manual switch, 12
．． 13... Breaker, 14.15.16... Relay, 17... Limit switch.

Claims (1)

[Scope of Claims] l) A drive motor for tilting the back portion around the rear of the seating portion of the seat, and a drive motor for causing the back portion to tilt forward by applying a current in one direction to this motor. and a second current path for passing a current in the other direction to the motor and tilting the dorsal portion rearward, each of the current paths being cut off. A drive device for an electric reclining seat, characterized in that the circuit breaker for the second current path is opened with a smaller current than the circuit breaker for the first current path. 2. The electric reclining seat drive device according to claim 1, wherein the drive motor is capable of forward and reverse rotation, and the torque is different when rotating in the forward direction and when rotating in the reverse direction. .