JPH07232577A - Seat slide device - Google Patents

Abstract

PURPOSE:To provide a seat slide device where the rapid manual walk-in operation is possible irrespective of the electric movement of a seat side rail to a vehicle body side rail, the getting in/out of the rear seat is easy, the safety in the emergency is high, the nut is not loosened in the normal operation where the nut is restricted to one rail, no abnormal noise is generated, and the slide operation is smooth. CONSTITUTION:A rotated screw member 41 is supported by either of a vehicle body side rail 21 or a seat side rail 31, and a locking member 60 capable of restricting a nut member 42 which is rotatably screwed in a relative manner to the screw member 41 is supported by the other of the vehicle body side rail 21 or the seat side rail 31, and an engagement part 44a for stopping the loosening which is slidably abutted on either rail on the side where the nut member 42 is not held in an irrotational manner through the locking member 60 is provided on the nut member 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a vehicle body side rail fixed to a vehicle body floor side, and a seat side rail for movably fitting in the vehicle body side rail in a longitudinal direction to support a seat. ,
The present invention relates to a seat slide device capable of adjusting a seat position by moving a seat side rail with respect to a vehicle body side rail and performing a walk-in operation. Particularly, the present invention relates to a seat slide device in which a drive mechanism operated by electric power is a so-called screw & nut type, and the drive mechanism is housed in a gap between both rails.

[0002]

2. Description of the Related Art Conventionally, as a seat slide device of this type, there is one shown in FIG. 4, for example. That is, a seat side rail 2 that supports a seat is fitted to a vehicle body side rail 1 that is fixedly installed on the vehicle body floor side so as to be movable back and forth, and an electric motor (not shown) is used as a power source for the seat side rail 2 A drive unit 3 for moving the vehicle back and forth is housed in a space formed by both rails 1 and 2. The drive unit 3 includes a screw member 4 rotatably supported by the seat side rail 1 and a nut member 5 screwed relatively rotatably to the screw member 4 and non-rotatably fixed to the vehicle body side rail 2. It is equipped with.

[0003]

However, such a conventional seat slide device has a seat (driver's seat or front passenger seat), that is, a seat, driven by an electric motor, for example, when getting on and off a rear seat in a two-door vehicle. Since it is necessary to wait for the side rails 1 to gradually move forward, it is time-consuming and cumbersome, and even when it is necessary to quickly get out of the passenger compartment from the rear seats in an emergency, the seats can be manually moved forward quickly. There was a safety problem because the walk-in operation cannot be performed.

Therefore, according to the Japanese Patent Application No. 3-49835, the applicant has a seat slide which allows a quick walk-in operation manually even though the seat side rail is moved forward and backward relative to the vehicle body side rail by electric power. Proposed a device. This is because a screw member is rotatably supported on a seat side rail, and a nut member that is rotatably screwed on the screw member is constrained by the engagement / disengagement member to the vehicle body side rail in a non-rotatable manner. , The constraint is released during the walk-in operation.

However, in such a screw-and-nut type, when the nut is restrained with respect to one rail by the engagement / disengagement member, the nut is easily rattled during such restraint, and the rattling causes the restraint to be released. Since this is also the case, improvement for further improvement in performance was requested.

The present invention has been made in view of such problems and demands of the prior art. In spite of electrically moving the seat side rail with respect to the vehicle body side rail, a quick manual walk-in operation is performed. It is also possible to get in and out of the rear seats and has a high degree of safety in an emergency, and the nut is restrained against one rail. An object of the present invention is to provide a seat slide device that can be smoothly slid.

[0007]

The gist of achieving the above object is to provide a vehicle body side rail (21) fixedly mounted on the vehicle body floor side, and to move longitudinally to the vehicle body side rail (21). A seat-side rail (31) that fits as much as possible to support the seat, and can move the seat-side rail (31) with respect to the vehicle-body-side rail (21) by power to adjust the seat position and walk-in. In an operable seat slide device (10), a screw member (41) rotatably supported by power along one of the vehicle body side rail (21) and the seat side rail (31), and the screw. A nut member (42) that is rotatably screwed relative to the member (41), and a normal restraining position and walk that engages with the nut member (42) and holds the nut member (42) non-rotatably. A lock member (60) supported by the other rail of the vehicle body side rail (21) and the seat side rail (31) so as to be displaceable to the restraint release position where it is disengaged from the nut member (42) at the time of a steering operation. And a lock member (6) in the restrained position on the nut member (42).
0), the nut member (42) is provided with an engaging portion (44a) for preventing backlash that slidably abuts against the one rail on the side where the nut member (42) is not non-rotatably held. It resides in the slide device (10).

[0008]

When the seat is in a normal seated state, the screw member (41) rotatably supported by one of the vehicle body side rail (21) and the seat side rail (31) is driven by the power of an electric motor or the like. When rotated, the nut member (42) screwed into the screw member (41) relatively moves back and forth according to the rotation torque.

The nut member (42) is engaged with a lock member (60) which is normally in a restrained position, and the nut member (42) is attached to the vehicle body side rail (21) and the seat side rail (31). It is held non-rotatably on the other rail. Therefore, the relative movement of the nut member (42) back and forth accompanying the rotation of the screw member (41) causes the vehicle body side rail (2) to move.
Since the seat side rail (31) slides against 1),
The seat position can be adjusted appropriately.

The engaging portion (44a) provided on the nut member (42) slidably abuts on the one rail on the side where the nut member (42) is not held non-rotatably. . Therefore, when the nut member (42) moves back and forth relative to the screw member (41) rotated by power, the engaging portion (44a) of the nut member (42).
Is in sliding contact with the one rail.

As a result, rattling of the nut member (42) is prevented, and the lock member (60) displaced to the restraining position can be reliably engaged with the nut member (42). Particularly, when the seat side rail (31) is slid with respect to the vehicle body side rail (21), the nut member (42) does not rattle up and down, and accordingly,
No unusual noise is generated and smooth slide operation is possible. Further, there is no inconvenience such that the lock member (60) is released from the constraint due to the rattling with respect to the nut member (42).

In a two-door vehicle, when the passenger gets on or off the rear seat, or when it is necessary to quickly get out of the passenger compartment from the rear seat, the lock member (60) is set to the restraint releasing position where it is disengaged from the nut member (42). It can be displaced. The nut member (42) released from the constraint by the lock member (60) is freely screwed to the other rail on which the lock member (60) is supported while being screwed to the screw member (41). It becomes movable.

Thus, in an emergency, when it is necessary to immediately move out of the passenger compartment from the rear seat, without waiting for the seat (driver's seat or passenger's seat) to gradually move forward by the power of the electric motor or the like. , The safety is improved because a quick walk-in operation can be performed manually. Further, the same walk-in operation can be performed even when the power source of the electric motor or the like is turned off, which improves the entry / exitability of the two-door vehicle.

When the lock member (60) is returned to the restraining position where it engages with the nut member (42), the nut member (4) is again attached to the other rail via the lock member (60).
2) is non-rotatably restrained and enters a normal seating state in which the seat position can be adjusted appropriately by the power of an electric motor or the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. As shown in FIG. 1, the seat slide device 10 is movable to a vehicle body side rail 21 fixed to a vehicle body floor via leg members 12 and 13, and to the vehicle body side rail 21 in a longitudinal direction (corresponding to the front-rear direction). And a seat-side rail 31 for directly supporting the seat. The vehicle body side rail 21 and the seat side rail 31 are combined to form one rail unit, and actually, a pair of rail units are arranged below both side portions of a seat cushion of a vehicle seat which is a seat. become.

The vehicle body side rail 21 is formed in a groove-shaped cross section as shown in the drawing, and has a bottom surface portion 22 and side wall portions 23,
23 and a ceiling 24. An opening groove 24a that extends in the longitudinal direction is formed at approximately the center of the ceiling portion 24. One of the seat side rails 31 is also formed in a groove-shaped cross section, and has a ceiling portion 32 and side walls 33, 33,
The bottom side has a large opening. As shown in FIG. 2, both the rails 21 and 31 are fitted to each other such that the bottom opening side of the seat side rail 31 enters the opening groove 24a of the vehicle body side rail 21, and the vehicle body side rail is inside thereof. A space surrounded by the bottom surface portion 22 and the both side wall portions 23, 23 of 21 and the ceiling portion 32 and the both side wall portions 33, 33 of the seat side rail 31 is formed.

Both ends of the guide groove 24a of the vehicle body side rail 21 are bent downward to form downward flanges 24b,
24b is formed. On the other hand, the lower end edges of the side wall portions 33, 33 of the seat side rail 31 are respectively bent upward to form upward flange portions 33a, 33a. The downward flange 24b and the upward flange portion 33a are slidably opposed to each other, and a spherical bearing 35 is interposed between the flanges 24b and 33a. Further, a roller bearing 36 is interposed between the bottom surface portion 22 of the vehicle body side rail 21 and the upward flange portion 33 a of the seat side rail 31.

As shown in FIGS. 2 and 3, a drive mechanism 40 for moving the seat side rail 31 back and forth with respect to the vehicle body side rail 21 by power is installed inside the space between the rails 21 and 31. The drive mechanism 40 has a screw member 41 that is rotatably supported along the seat-side rail 21, and a nut member 42 that is rotatably engaged with the screw member 41. The rear end 41b of the screw member 41 is rotatably supported by the ceiling portion 32 of the seat-side rail 31 via a bearing member 45.

The front end 41a of the screw member 41 is inserted through a mounting bracket 46 into a gear case 50 fixed to the front end of the seat side rail 31. As shown in FIG. 3, a worm 51 is rotatably installed inside the gear case 50, and a worm wheel 52 that meshes with the worm 51 is also installed inside. The worm wheel 52
The front end 4 of the screw member 41 inserted through the gear case 50
It is integrally rotatably fixed to 1a. The worm 51 is integrally fixed to the output shaft of the electric motor 53 shown in FIG.

The nut member 42 comprises a nut 43 and a nut housing 44 which accommodates the nut 43 so that it cannot rotate. As shown in FIGS. 2 and 3, the nut member 42 is normally held on the bottom surface portion 22 of the vehicle body side rail 21 via a lock member 60 described later so as not to be movable back and forth and to be rotatable. On both side wall surfaces of the nut housing 44, engaging portions 44a, 44a for locking are provided which slidably abut on the seat side rail 31 on the side where the nut member 42 is not restrained via the lock member 60. There is.

Each engaging portion 44a is a nut housing 44.
Projecting from both side wall surfaces of the seat side rail 31 to project to both sides, as shown in FIG.
It is set so as to slidably contact the bottom of the. A fitting hole 45 is formed in the bottom surface of the nut housing 44 so that a lock member 60, which will be described below, is engaged with the fitting hole 45.

The lock member 60 engages with the nut housing 44 of the nut member 42 to hold the nut member 42 in a non-rotatable position, and to release the lock member 60 from the nut member 42 during a walk-in operation. It is supported by the bottom surface portion 22 of the vehicle body side rail 21 so as to be displaceable between the two.
More specifically, on the bottom surface portion 22 of the vehicle body side rail 21,
A pivot shaft 62 is rotatably supported via a support bracket 61 in a state parallel to the rail longitudinal direction, and the lock member 60 rotates the pivot shaft 62 at a notched portion in the approximate center of the support bracket 61. It is mounted so that it can swing.

The tip portion 60a of the lock member 60 has a bottom surface portion 2 of the vehicle body side rail 21 as shown by a solid line in FIG.
2 is inserted into the insertion hole 25 bored in 2 and engaged with the fitting hole 45 of the nut housing 44 in a restraining position and a restraining position released from the fitting hole 45 and the inserting hole 25 as shown by an imaginary line. It is movably attached integrally to the pivot 62. The lock member 60 is normally biased by the coil spring 63 so as to be in the restrained position. When the lock member 60 is in the restrained position, the nut member 42 is held by the bottom surface portion 22 of the vehicle body side rail 21 so that it cannot move forward and backward and cannot rotate. On the other hand, when the lock member 60 is in the restrained release position, the nut member 42 moves. The screw member 41 can be freely moved with respect to the vehicle body side rail 21 while being screwed.

Although not shown, the lock member 60 and the pivot 61 are set so as to swing from the restraint position to the restraint release position against the biasing force of the coil spring 63 in conjunction with the forward tilting operation of the seat back. Has been done. That is, if the seat back is tilted forward, the walk-in operation can be performed as it is.

Next, the operation will be described. When the seat is in a normal seated state, as shown in FIGS. 2 and 3, the lock member 60 swingably supported by the vehicle body side rail 21 is engaged with the nut member 42 by the biasing force of the coil spring 63. You are in a restrained position. The front end portion 60a of the lock member 60 at the restrained position passes through the insertion hole 25 formed in the bottom surface portion 22 of the vehicle body side rail 21, and the insertion hole 4 of the nut housing 44.
5 and thereby, the nut member 42 is constrained to the vehicle body side rail 21 so as not to rotate and move.

When the screw member 41 is rotationally driven by the electric motor 53 in a state where the nut member 42 is restrained on the vehicle body side rail 21 side, the nut member 42 screwed into the screw member 41 in accordance with the rotational torque is generated. Move relatively back and forth. Therefore, the seat-side rail 31 supporting the screw member 41 moves back and forth with respect to the vehicle body-side rail 21, and the front-back position of the seat can be adjusted appropriately.

As shown in FIG. 2, the nut housing 44
Each of the engaging portions 44a provided on the upper side of the seat-side rail 31 that is the side on which the nut member 42 is not non-rotatably held via the lock member 60 in the restrained position.
It is slidably in contact with the bottom side of 3a. Therefore, when the nut member 42 moves back and forth relative to the screw member 41 that is rotationally driven, each engagement portion 44a of the nut housing 44 slides on the bottom side of the upward flange portion 33a of the seat side rail 31. Contact.

As a result, rattling of the nut member 42 is prevented, and the lock member 60 swung to the restraining position can be reliably engaged with the nut member 42. In particular, when the seat side rail 31 is slid with respect to the vehicle body side rail 21, the nut member 42 does not rattle up and down, and therefore no abnormal noise is generated and a smooth sliding operation is possible. . Further, it is possible to prevent an inconvenient situation in which the lock member 60 is released from being restrained by the nut member 42 due to rattling.

When a passenger is getting on or off a two-door vehicle, or when it is necessary to quickly get out of the passenger compartment from the rear seat, the seat back may be tilted forward. The locking member 60 swings from the restraint position to the restraint release position in opposition to the biasing force of the coil spring 63 in conjunction with the seat back forward operation. Thereby,
The nut member 42 can freely move with respect to the vehicle body side rail 21 together with the seat side rail 31 while being screwed to the screw member 41.

In this way, when the lock member 60 swings to the restraint release position, a walk-in operation of moving the seat side rail 31 (seat) forward quickly is manually performed even when the electric motor 53 is powered off. Can be done,
Improves entry and exit for 2-door vehicles. Also, in the event of an emergency, when you need to get out of the passenger compartment immediately from the rear seat, you do not have to wait for the seat to move forward due to the drive of the electric motor.
Quick walk-in operation is possible and safety is improved.

To return the lock member 60 to the restrained position where it engages with the nut member 42, first, the seat side rail 31 is pushed back to the predetermined position. Then, when the seat back is waited up to its original position, the biasing force of the coil spring 63 swings the lock member 60 to the restraining position where it engages with the nut member 42, and the lock member 60 causes the nut member 42 to move toward the vehicle body. The rail 21 is non-rotatably and immovably restrained. That is, the front and rear positions of the seat can be adjusted by the electric motor 53.

The locking member in the above embodiment is
Although it is supported by the vehicle body side rail so as to be displaced by swinging between the restraint position and the restraint release position about the pivot, the lock member may be supported so as to be slidably displaced between the restraint position and the restraint release. Good. Further, while the screw member is supported on the seat side rail, the lock member for restraining the nut member is movably supported on the seat side rail, but the present invention is not limited to the illustrated embodiment, and as a reverse aspect, the screw is used. While the member is supported by the vehicle body side rail, the nut member may be displaceably supported by the seat side rail.

[0033]

According to the seat slide device of the present invention, the nut is moved regardless of the type in which the seat side rail is gradually moved with respect to the vehicle body side rail by the relative movement of the nut member accompanying the rotational driving of the screw member. It is possible to release the restraint of the member to the rail and perform a quick walk-in operation manually, which improves the ease of getting on and off in a two-door vehicle, etc., and enhances the safety in an emergency, etc. Moreover, the nut member has a lock member. Since the engaging portion slidably abutting on the one rail on the side where the nut member is not restrained is provided, the rattling of the nut member can be prevented and the lock displaced to the restraining position with respect to the nut member. The members can be reliably engaged. Further, when the seat side rail is slid with respect to the vehicle body side rail, the nut member does not rattle up and down, and therefore no abnormal noise is generated and a smooth sliding operation is possible. In addition, it is possible to prevent an inconvenient situation in which the lock member is restrained from being locked by the nut member due to backlash.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a seat slide device according to an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view showing a portion of the seat slide device according to an embodiment of the present invention, which is cut at a right angle to the longitudinal direction.

FIG. 3 is a vertical cross-sectional view showing a portion of the seat slide device cut in parallel with the longitudinal direction according to the embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a rail unit of a conventional seat slide device.

[Explanation of symbols]

 10 ... Seat slide device 21 ... Car body side rail 31 ... Seat side rail 41 ... Screw member 42 ... Nut member 43 ... Nut 44 ... Nut housing 44a ... Engaging portion 60 ... Lock member

Claims (1)

[Claims] Claims: 1. A vehicle body side rail fixed to a vehicle body floor side, and a vehicle seat side rail which is movably fitted in the vehicle body side rail to support a seat, the vehicle seat side rail being driven by power. In a seat slide device capable of adjusting a seat position by moving a vehicle body side rail and performing a walk-in operation, the seat slide device is rotatably supported along one of the body side rail and the seat side rail by power. A screw member, a nut member that is rotatably engaged with the screw member, a normal restraining position that engages with the nut member and holds the nut member unrotatable, and a nut during a walk-in operation. A lock member supported by the other rail of the vehicle body side rail and the seat side rail so as to be displaceable to a restraint release position where the nut member is separated from the member; A seat slide device provided with an engaging portion for preventing backlash that slidably abuts against the one rail on the side where the nut member is not non-rotatably held via the lock member in the restrained position. .