JPH0741628Y2 - Power seat equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power seat device used in an automobile or the like, and more particularly to a power seat device suitable for a seat having a walk-in function.

[0002]

2. Description of the Related Art Conventionally, a power seat device includes a lower rail fixedly mounted on a floor of a vehicle body, and an upper rail slidably fitted to the lower rail and fixedly secured with a seat.
A rack fixed to the lower rail and a pinion supported by the upper rail and fitted to the rack are provided, and the pinion is driven by an electric motor via a nonreciprocal reduction gear mechanism including a worm gear and a wheel gear. It is known to have been made.

[0003]

However, in such a power seat device, the rotation of the electric motor is reduced by the non-reversible reduction gear mechanism to drive the pinion to obtain the required torque. The characteristic is that the moving speed of the seat is slow.

By the way, in a two-door vehicle or the like, there is known a vehicle having a so-called walk-in function in which the seat cushion automatically moves forward when the seat back is tilted forward in order to easily get in and out of the rear seat. ing. However, if an attempt is made to realize such a walk-in function with the above-described power seat device, since the rotational speed of the electric motor is limited, the moving speed of the seat cannot be sufficiently set, and the seat is moved at a satisfactory speed. I can't.

For these reasons, it is quite difficult to realize a power seat device having a walk-in function, and it has not been realized yet.

In view of such circumstances, an object of the present invention is to provide a power seat device which can realize a walk-in function without causing a decrease in position holding strength.

[0007]

In order to achieve the above object, the present invention provides a lower rail fixed to a vehicle body floor,
An upper rail slidably fitted to the lower rail and having a seat that can be tilted forward is fixed, a rack fixed to one of the rails, and a rack supported on the other of the rails. In a power seat device having a pinion that meshes with an electric motor that drives the pinion via a reduction gear mechanism, in the drive system between the pinion and the electric motor, the seat is It is characterized in that a clutch mechanism that cuts off power transmission when tilted is provided.

[0008]

According to the present invention, during normal seat position adjustment, the pinion may be driven via the reduction gear mechanism by engaging the clutch mechanism. Also, at the time of walk-in, if the clutch mechanism is set to the intermittent state, the pinion becomes free and the restraint with the rack is released.
The seat can be moved quickly.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a mounting bracket 2 (2A
And 2B), the lower rail is fixedly mounted on a vehicle body floor (not shown).
It has a character shape, and a rack 3 is fixedly installed on one inner side surface thereof (see FIG. 1). Reference numeral 4 denotes an upper rail slidably fitted to the lower rail 1. In this embodiment, the upper rail 4 also has a substantially U-shaped cross section, and a vertical wall on the upper surface of which a seat cushion (not shown) is attached. 5 (5A and 5B) are fixed. An opening (not shown) is formed between the vertical walls 5 on the upper surface of the upper rail 4, and a clutch mechanism composed of a reduction gear mechanism and a planetary gear set, which will be described later, is provided corresponding to the opening. Built-in casing 6
(6A and 6B) are fixed with bolts 7.

Reference numeral 8 denotes an electric motor mounted on a panel 9 connecting the left and right upper rails 4, and drives a worm gear 11 rotatably supported by a casing 6 via a flexible cable 10 to rotate in both directions. .

In this embodiment, the reduction gear mechanism is a non-reversible reduction gear mechanism composed of the worm gear 11 and the wheel gear 13 fixedly mounted on the shaft 12 rotatably supported by the casing 6. Has been done. A pinion 14 is rotatably supported on the shaft 12, and the pinion 14 meshes with the rack 3 fixed to the lower rail 1 described above.

Here, a clutch mechanism composed of a planetary gear set arranged between the reduction gear mechanism and the pinion 14 will be described mainly with reference to FIG.

A flange member 15 is press-fitted and fixed to the shaft 12, and a sun gear 16 is similarly press-fitted and fixed to the lower side thereof (see FIG. 3A). Further, a reinforcing plate 17 is press-fitted and fixed on the upper side of the collar member 15, and the reinforcing plate 17 is fixedly mounted on the wheel gear 13 by a screw (not shown) mounted in the mounting hole 17A. The reinforcing plate 17 and the collar member 15
And may be integrally formed.

Next, 18 is a ring gear rotatably supported by the flange member 15, and a locking groove 18A is formed in the outer peripheral portion thereof. The locking groove 18A is formed so that the locking claw 20A of the latch 20 whose one end is pivotally attached by a pivot pin 19 is engaged with the upper surface of the upper rail 4 together with the casing 6 described above. A coil spring 2 is attached to the pivot pin 19.
The one winding part is supported and biases the latch 20 in the engaging direction. Further, one end of an operation cable 22 driven by an operation lever provided on a seat back or the like is fixed to the middle portion of the latch 20.

Reference numeral 23 is a carrier plate supported by the shaft 12 so as to rotate integrally with the above-mentioned pinion 14, and three support shafts 23A are planted at equal intervals in the circumferential direction. A carrier pinion 24 that meshes with the ring gear 18 and the sun gear 16 is rotatably supported by the shaft 23A.

In this embodiment having the above-mentioned structure, during the normal seat position adjustment, the locking claw 20A of the latch 20 is engaged with the locking groove 18A of the ring gear 18 by the urging force of the coil spring 21. The rotation of the ring gear 18 is blocked.

When the electric motor 8 is activated in such a state, the worm gear 11 is rotated via the flexible cable 10 and the wheel gear 13 meshing with a predetermined reduction ratio is also rotated. When the wheel gear 13 rotates, the sun gear 16 rotates via the reinforcing plate 17 and the shaft 12 which are integral with the wheel gear 13. Then, ring gear 18
Is fixed, the carrier pinion 24 meshing with the ring gear 18 revolves around its own axis. That is, the carrier plate 23 rotates, and the pinion 14 integral with this rotates. As a result, the pinion 14 is guided by the rack 3 to roll, and the position of the upper rail 4 is adjusted while sliding on the lower rail 1.

In this stopped state, even if there is an input from the seat side, this input is a force for rotating the pinion 14, but the sun gear 16 uses the nonreciprocal gear mechanism of the worm gear 11 and the wheel gear 13. , The rotation is blocked together with the ring gear 18, so that the pinion 14
Does not rotate.

On the other hand, when the power seat device is used in the front seat of the vehicle and the operation lever is operated to tilt the seat back forward, the latch 20 acts on the urging force of the coil spring 21 via the cable 22. Rotated against, latching pawl 20
The engagement with the locking groove 18A of the A ring gear 18 is released. Then, the ring gear 18 is released from the restraint, and the sun gear 16 is in the fixed state as described above, so that the carrier pinion 24 becomes revolvable while rotating on its axis. At this time,
The upper rail 4 is urged in the front direction of the vehicle by a spring (not shown), and as described above, the carrier pinion 24 and the carrier plate 2 in the revolvable state.
3, the pinion 14 integrally rotates, and the upper rail 4, and thus the seat, quickly move forward.
A so-called warm-in operation is performed.

When the seat back is returned and the walk-in is released, the latch 20 can be engaged at the original position of the seat by providing the operation lever with a known memory device.

In the above embodiment, the reduction gear mechanism is a non-reversible one using a worm gear, but if a restraining means for preventing rotation of the reduction gear at the adjusted position is provided, the reduction gear mechanism is non-reversible. Not limited to things.

Further, in this embodiment, since the clutch mechanism is composed of the planetary gear set, the electric motor can be downsized by the amount that the driving torque of the pinion 14 is increased.

[0024]

As is apparent from the above description, according to the power seat device of the present invention, the clutch mechanism for interrupting the power transmission when the seat leans forward is disposed in the drive system of the pinion that meshes with the rack. Since it has been installed, without lowering the position holding strength of the seat in the front-back direction of the vehicle,
The seat can be quickly slid by allowing the pinion to freely rotate during the walk-in in which the seat is tilted forward.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 in which a rail portion is omitted.

FIG. 3 is an exploded perspective view showing an assembling procedure of a main part of one embodiment of the present invention.

[Explanation of symbols]

 1 Lower Rail 3 Rack 4 Upper Rail 8 Electric Motor 11 Worm Gear 13 Wheel Gear 14 Pinion 16 Sun Gear 18 Ring Gear 18A Locking Groove 20 Latch 23 Carrier Plate 24 Carrier Pinion

Claims (1)

[Scope of utility model registration request] 1. A lower rail fixed to a vehicle body floor,
An upper rail that is slidably fitted to the lower rail and has a seat that can be tilted forward is fixed, a rack that is fixed to one of the rails, and the other of the rails. In a power seat device having a pinion supported by and engaged with the rack and driven by an electric motor through a reduction gear mechanism, in a drive system between the pinion and the electric motor. ,Previous
A power seat device comprising a clutch mechanism for cutting off power transmission when the seat leans forward .