JP2547062B2 - Vehicle power seat locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to one of a pair of rail units including a lower rail fixed to the floor side and a seat cushion side upper rail slidably engaged with the lower rail. The present invention relates to a lock device for a vehicle power seat, which is provided on the other side when a slide drive device is provided in the non-slide state.

[Conventional technology]

This type of locking device is known from Japanese Patent Laid-Open No. 61-253234, in which rods juxtaposed to the upper rails of the non-driving side rail unit are tightened with an elastic body, and the elastic body is tightened with a solenoid when the slide drive device is operated. It is designed to be released.

[Problems to be Solved by the Invention]

However, a strong elastic body is required to obtain a sufficient tightening force, and a solenoid having a large driving torque is required to release the elastic body. Therefore, it is bulky in terms of shape, and the seat cushion may feel a foreign object.

It is therefore an object of the present invention to provide a locking device of the kind mentioned at the outset which employs a mating locking device.

[Means for solving the problem]

In order to achieve this object, the present invention provides a lock plate (21) in which a lock device has a tooth profile (21a, 21b) formed along the sliding direction on either the upper rail (2, 2a) or the floor side. And a spring (2) provided on the other side so as to engage with the recess (21a) of this lock plate.
8) A lock lever (23) that is urged by the lock lever (23) that is movable between the engagement and disengagement positions, and moves this lock lever from the engagement position to the engagement and disengagement position against the bias when the switch (14) slides. Actuator (24) and lock lever (2
First, which detects which side of the lock plate (21) is in contact with the protrusion (21b) of the lock plate (21) is closer to the recess (21a)
Position sensor (25) and the lock lever (23)
b) or the second position sensor (26) for detecting the position in the recess (21a), and the detection signal of the first position sensor (25) after the slide operation of the switch (14) is completed. The control circuit operates the slide drive device (10) in the direction until the second position sensor (26) detects the engagement of the lock lever (23) into the recess (21a).

[Action]

In a normal state, the lock lever (23) is engaged with the recess (21a) of the lock plate (21) by the spring bias and locked. When adjusting the slide, the actuator (24) operates the switch (14) to disengage the lock lever (23) against the spring force, and the slide drive device (10) moves the seat cushion forward or backward.

If the lock lever (23) is not engaged when the operation is finished, the second position sensor (26) detects this and responds to the detection signal of the first position sensor (25). When the slide drive device (10) is actuated in the direction and the lock lever (23) moves and is properly engaged, the second position sensor (26) detects this and activates the slide drive device (10). Stop and lock.

Example of Invention

1 to 3 show a vehicle power seat according to an embodiment of the present invention.

In FIG. 2, a pair of rail units including lower rails 1 and 1a fixed to the floor side and upper rails 2 and 2a fixed to the seat cushion side and slidably engaged with the lower rails 1 and 1a are juxtaposed. There is.

On one of the rail units 1 and 2, a screw 12 arranged in parallel on the upper rail 2 and a bracket 13 attached to the lower rail 1 so as to mesh with the screw 12 are mounted.
There is provided a slide drive device 10 which is known per se and is composed of a nut housed in the drive unit and a motor 11 that rotationally drives the screw 12 to slide between the stoppers 12a on both sides by operating a switch 14. Then, as shown in FIG. 3, in order to rotate the motor 11 in the forward and reverse directions in response to the push operation of the seesaw-type switch 14 to the forward side or the backward side, it is composed of relays K1 and K2 and transistors Tr1 and Tr2. Further, a motor drive circuit provided with a control circuit described later is provided.

On the other hand, the rail units 1a and 2a on the other side are provided with a lock device 20 described in detail in FIG. This locking device includes a lock plate 21 having tooth shapes of the same shape and pitch formed on the floor side along the sliding direction,
A lock lever 23 fixed to a rod 22 that is juxtaposed to the upper rail 2a and rotatably supported by a bearing 22a so as to be engaged with the recess 21a of the lock plate, and is rotatably supported by a bearing 22a. And a rotary solenoid 24 that rotationally drives the rod 22 so as to move the lock lever from the engaged position to the engagement / disengagement position against the bias of the spring, and the lock lever 23 contacts the convex portion 21b of the lock plate 21. The limit switch 25 attached to the upper rail 2a to detect which side the recessed part 21a is closer to, and the end bend of the rod 22 to detect that the lock plate 21 is disengaged from the recessed part 21a. It is composed of a limit switch 26 which is turned on by being actuated by the portion 22b in the disengaged position.

Further, in this locking device 20, as shown in FIG. 3, the power feeding diodes D1 and D2 from the switch 14 and the limit switch 26 in the direction according to the detection signal of the limit switch 25 after the operation of the switch 14 are completed. To activate the motor 11 until it is turned off, the charging circuit R1, C1, OR gate
A control circuit consisting of OR1, OR3, a transistor Tr3 and a charging circuit R2, C2 OR gates OR2, OR4 and a transistor Tr4 having a similar parallel configuration is attached.

The roller 25a at the tip of the operator of the limit switch 25 is interlocked with the lock lever 23 along the convex portion 21b, and is set in the positional relationship shown in FIG. 4 with respect to this lever. That is, as shown in FIG.
When the roller is just placed at the center position of the convex portion 21b, the roller 25a is located at the edge of the adjacent convex portion 21b and is at the boundary position of the switching operation. Therefore, the limit switch 25 moves to the contact 25 while sliding in the forward direction toward the position shown in FIG.
Switching to b (FIG. 3), when the lock lever 23 comes to the substantially central position of the recess 21a, it disengages from the edge and switches to the contact 25c. Conversely, the limit switch 25 switches to the contact 25c while sliding in the backward direction toward the position shown in FIG.

 The operation will be described with reference to FIG.

When the switch 14 is operated to the forward side, the rotary solenoid 24 is rotationally driven through the diode D1, the lock lever 23 is engaged / disengaged, the limit switch 26 is turned on, and the relays K1 and K2 are supplied with power. In addition, OR gate OR
By turning on the transistor Tr3 or Tr4 through 1 or OR2, the capacitors C1 and C2 are grounded and the control by the detection signal of the limit switch 25 is not performed. As a result, the transistor Tr1 is turned on through the OR gate OR3, the relay K1 is turned on, and the motor 11 is normally rotated, that is, driven forward. When the switch 14 is operated in the reverse direction, the relay K2 similarly drives the motor 11 in the reverse direction.

When the operation of these switches 14 is completed, the diode
Power is not supplied from D1 and D2, the rotary solenoid 24 is deactivated, and the charging circuits C1, R1; C2 and R2 are operable. When the lock lever 23 is placed on the convex portion 21b at a position closer to a in FIG. 4b than in FIG. 4b, the limit switch 25 is in contact with the contact 25b and the limit switch 26 is in the ON state, and Powering relays K1 and K2. As a result, the charging voltage of capacitor C2 becomes OR3.
The transistor Tr1 is turned on to drive the motor 11 forward. As a result, when the lock lever 23 falls into the recess 21a by the spring biasing force, the limit switch 26 is turned off, the driving of the motor 11 is interrupted, and the spring biasing force stabilizes the lock state.

During this operation, the transistor Tr4 grounds the capacitor C1 to ensure reliable forward drive regardless of the delicate operation of the limit switch 25. Conversely, switch 14
If the lock lever 23 is located more than c in Fig. 4b when the hand is released from, the limit switch
25 contacts the contact 25c, turns on Tr2 through OR4 with the charging voltage of the capacitor C1, and drives the motor 11 backward through the relay K2.

The present invention can be applied to a known lock plate, and the concavities and convexities do not necessarily have to have the same size as long as they have the same pitch. As the first position sensor, a rotary encoder that detects the amount of rotation of the screw is used to estimate the lock lever position and a CPU is used for the control circuit, a lock lever with another movable structure is used, or a rotary solenoid is used instead. Various modifications are conceivable within the scope of the present invention, such as employing a motor.

〔The invention's effect〕

As described above, according to the present invention, it is possible to employ a meshing type lock mechanism using a spring-biased lever even for a power seat. As a result, downsizing, weight reduction, high reliability, and cost reduction are achieved, there is no sense of foreign matter when seated, and there is no restriction on the space under the rear seat. The engagement adjustment of the lock lever after completion of the operation is performed at the shortest distance, and the deviation of the set position is small.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a power seat according to an embodiment of the present invention, FIG. 2 is a perspective view of the whole of the same embodiment, FIG. 3 is an auxiliary circuit diagram of the same embodiment, and FIG. FIG. 5 and FIG. 5 are flowcharts for explaining the operation of the embodiment. 1, 1a …… lower rail, 2, 2a …… upper rail, 10…
… Slide drive, 11 …… Motor, 14 …… Switch,
20 …… Lock device, 21 …… Lock plate, 23 …… Lock lever, 25,26 …… Limit switch.

Claims (1)

(57) [Claims] 1. A pair of rail units composed of a lower rail fixed to the floor side and an upper rail fixed to the seat cushion side and slidably engaged with the lower rail, the upper rail being automatically advanced and retracted in response to a switch operation. A locking device for a vehicle power seat, which is provided on the other side of a side on which a slide drive device for sliding in either direction is provided, and which restrains the upper rail when the slide drive device is not operating, in either of the upper rail or the floor side. One of the lock plates has a tooth profile formed along the sliding direction, and the other is provided on the other side of the upper rail or the floor, and is spring-biased so as to be engaged with the recess of the lock plate and between the disengaged positions. Is a movable lock lever, and this lock lever is operated by a switch. An actuator that moves from the engagement position to the engagement / disengagement position against the bias, and detects which side of the recess the position where the lock lever contacts the protrusion of the lock plate is close to First to do
Position sensor, a second position sensor that detects that the lock lever is positioned in the convex portion or the concave portion, and in a direction according to the detection signal of the first position sensor after the slide operation is completed. And a control circuit that operates the slide drive device until the second position sensor detects the engagement to the recess position, the locking device for a power seat for a vehicle.