JPH0226482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an electric reclining seat drive device, and particularly 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 the forward/reverse motor 3 attached to the seat back 2 in the figure rotates, the motor rotates through three reduction gears 4a, 4b, 4c. Driving force is transmitted to the moving gear 5.

The rotating gear 5 is pivotally supported by a seatback bracket 6, and the seatback 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 back bracket 6 also rotates in conjunction with the rotating gear 5, and the seat bag 2 attached to the seat back bracket 6 also rotates in the backward or forward direction.

When a person is seated on such an electric reclining seat, the occupant's upper body pushes against the backside, resulting in a difference in the required torque of the motor during forward tilting movement and backward tilting movement.

In other words, when a large person leans on the seat and moves the back side forward from the rearmost reclined position,
The drive motor requires a large torque to overcome the load from the occupant's upper body; conversely, when moving backwards, the load from the occupant's upper body is added to the torque of the drive motor, so a small amount of torque is sufficient. Become.

Due to this phenomenon, the torque of the drive motor is limited to an extent that there is no 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

(Objective of the Invention) The present invention has been made in an attempt to eliminate the above-mentioned drawbacks of the prior art, and provides an electric reclining seat that can secure a complete torque even when the back part is tilted backwards and a sufficient torque when tilted forward. The purpose of the present invention is to provide a drive device for the following.

(Structure of the invention) In order to achieve this object, according to the invention,
a drive motor for tilting the back portion around the rear of the seating portion of the seat; a first current path for applying a unidirectional current to the motor to tilt the back portion forward; 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 each having a circuit breaker,
The second current path circuit breaker is characterized in that it is opened with a smaller current than the first current path circuit breaker.

(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 circuit breaker for the second current path open with a smaller current than the circuit breaker for the first current path, overcurrent may flow if the back side hits the legs of the passenger in the rear seat. In this case, the circuit breaker of the second current path 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 for forward and 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, allowing for quick adjustment to the appropriate seat position. It also has the effect of allowing

(Embodiments of the invention) Examples of the invention will be described below with reference to the accompanying drawings.

FIG. 2 shows an embodiment of this invention,
By changing the polarity of the power supply to the drive motor 10 using a manual switch 11, the direction of tilting movement of the back portion of the seat is changed.

The drive motor 10 is a DC motor and has three brushes 10a, 10b, and 10c. Current is supplied by a combination of brushes 10a and 10b or by brush 1.
A combination of 0a and 10c is used, but the latter has smaller torque when driven by the same power source.

The switch 11 has two interlocking contacts SW1,
SW2 is provided, and in the illustrated state, the motor 10 is driven so as to tilt the dorsal side portion rearward.

That is, in order to excite the relay 14 via the contact SW1, the contact of the relay 14 is closed, and the contact SW2 is closed.
The positive pole of the current is connected to the brush 10c of the motor 10 via the contacts of the relay 14. In addition, since the relay 15 has a normally closed contact, the circuit breakers 12 and 1
3. Relay 15 contacts and limit switch 1
The negative pole of the power source is connected to the brush 10a of the motor 10 via the motor 7. At this time, relay 16 is also a contact point.
Since it is energized via SW1 and limit switch 17, the normally closed contact opens.

Here, as mentioned above, the brush 10 of the motor 10
The combination of a and 10c 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 a force that prevents this movement is applied, the rotational speed of the motor decreases and the current flowing through this circuit increases.
When 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 you can see from the above, switch 11, relay 1
4, the circuit breakers 12, 13, the relay 15, the limit switch 17, etc., form a second current path for supplying a unidirectional current to the motor 10 and tilting the back portion rearward.

Also, if the switch 11 is turned in the opposite direction as shown, the motor 1 should be turned so that the dorsal part is tilted forward.
Drive 0.

That is, the relay 15 is energized via the contact SW1 of the switch 11, and its contacts are opened, and since both relays 14 and 16 are not energized, the contacts of the relay 14 are opened and the contacts of the relay 16 are closed.

Therefore, the positive pole of the power supply is connected to the brush 10a via the contact SW2 and the circuit breaker 12, and the relay 1
The brush 10b is connected to the negative pole of the power source through the contact point 6 and the limit switch 17.

Here, as mentioned above, the brush 10 of the motor 10
The combination of a and 10b has a large torque, and the circuit breaker 12 is set so that it opens only with a larger current than the circuit breaker 13. In other words, when the back side of the seat is tilted forward, the circuit breaker 1 is
2 is set not to open.

As can be seen from the above, switch 11, circuit breaker 1
2, a relay 16, a limit switch 17, and the like form a first current path for supplying current in the other direction to the motor 10 and moving the dorsal part toward the front side.

The limit switch 17 has fixed contacts 17a, 17b, and 17c arranged at regular intervals and a movable contact 17d that moves with the rotation of the motor 10 and the movement of the back side of the seat. A range in which the motor 10 can be electrically moved is determined, and the motor 10 is stopped outside that range.

This invention is not limited to the above-described embodiments, but includes various modifications as long as the object of the invention can be achieved. 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. 10... Drive motor, 11... Manual switch,
12, 13... Breaker, 14, 15, 16... Relay, 17... Limit switch.

Claims (1)

[Scope of Claims] 1. A drive motor for tilting the back portion of the seat centering on the rear portion of the seat; In a drive device comprising a first current path and a second current path for passing a current in the other direction to the motor and tilting the back portion rearward, each of the current paths is connected to a circuit breaker. An electric reclining seat driving device, characterized in that the second current path circuit breaker is opened with a smaller current than the first current path circuit breaker. 2. In the device according to claim 1,
The drive device for an electric reclining seat is characterized in that the drive motor is capable of forward and reverse rotation, and has different torques when rotating in the forward direction and when rotating in the reverse direction.