JPH0712153Y2 - Power seat slide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention supports a seat by fitting a rail on a vehicle body side fixed to an installation site and a rail on the vehicle body side relative to each other so as to be movable back and forth. A rail unit having a seat-side rail is provided, and the front-and-rear position of the seat is adjusted by moving the rail on the vehicle body side and the rail on the seat side relatively in the front-rear direction via a drive unit by power. The present invention relates to a power seat slide device.

"Prior Art" Conventionally, as a power seat slide device of this type, for example, there is one as shown in FIG.

That is, the rail 1 on the seat side and the rail 2 on the vehicle body are fitted to each other so as to be movable back and forth, and the rotational force of a drive motor (not shown) is changed to a force in the front-rear direction on both rails 1, 2
The drive unit 3 which can move back and forth relatively is housed in the space formed by both rails.

The drive unit 3 is screwed to the screw member 4 rotatably supported by the rail 1 on the seat side, and is rotatably engaged with the screw member 4 so that the drive unit 3 is mounted on the rail 2 on the vehicle body so as not to move forward and backward and to rotate. It has a nut member 5.

A worm wheel 6 is fixed to the end of the screw member 4, and a worm 7 that interlocks with power is meshed with the worm wheel 6. Worm wheel 6 and worm 7
Is installed in the gear case 8. A bush portion 9 is provided on the upper surface of the gear case 8 so as to project upward, and the bush portion 9 is fitted on the ceiling portion of the seat-side rail 1.

[Problems to be Solved by the Invention] However, in such a conventional power seat slide device, an excessive impact load due to a front-rear collision or the like is applied to the gear case 8 via the drive unit 3, and the gear case 8 is isolated. In order to increase the rigidity of the gear case 8, the material of the gear case 8 is limited to a certain range or the gear case is made large in order to receive an impact load, so that the cost is reduced, the weight is reduced, and the size is reduced. There is a problem that it becomes a big obstacle when doing things such as.

The present invention has been made in view of such conventional problems, and reduces the impact load applied to the gear case in the case of a collision in the front-rear direction or the like, and reduces the rigidity that the gear case should have to reduce the gear. An object of the present invention is to provide a power seat slide device that can be made lightweight by making a case from a resin material and can be easily assembled, and can be made compact and lightweight and at a low cost.

"Means for Solving the Problem" The gist of the present invention for achieving such an object is that a rail on the vehicle body side fixed to an installation site and a front and rear movement relative to the rail on the vehicle body side are possible. A rail unit having a seat-side rail that fits to support the seat, and is moved by power to relatively move the vehicle-body-side rail and the seat-side rail in the front-rear direction via a drive unit. In the power seat slide device for adjusting the front and rear positions of the vehicle body side rail and the seat side rail are respectively formed in a groove-shaped cross section, and the vehicle body side rail and the seat side rail are respectively formed. The openings are aligned with each other, and a part of one of the rails is raised to form a storage chamber by the rails on the vehicle body side and the rails on the seat side, and the drive unit controls the rails on the vehicle body side. Or a screw member that is rotatably supported by one of the rails on the seat side and rotatably supported, and a screw on the vehicle body side rail and the seat that is rotatably engaged with the screw member. A rail member on the other side, and a gear case in which a worm wheel rotatable by power and a worm wheel that meshes with the worm and is integrally rotatable with the screw member are installed, The face wall of the seat side rail or the vehicle body side rail that forms the storage chamber is cut and raised inward, and a pair of holding pieces are formed so as to face each other inside the storage chamber. The power seat slide device is characterized in that the gear case is held from the front and the rear and the gear case of the drive unit is stored in the storage chamber.

[Operation] Before the drive unit is assembled, a gear case is formed by previously incorporating the worm wheel with the screw member in mesh with each other. Then, the gear case and the screw member extending from the gear case are inserted between the rail on the vehicle body side and the rail on the seat side, and the gear case is positioned in the storage portion.

The gear case is inserted by sandwiching it between a pair of holding pieces formed by cutting and raising the surface wall of one rail inward, and by fixing the holding piece and both ends of the gear case, The installation is complete.

Sliding the body side rail and the seat side rail mutually,
When the nut member screwed to the screw member is fixed at the predetermined position on the other rail, the assembly of the drive unit is completed.

During a front-back collision, when the seat-side rail and the vehicle-body-side rail relatively move back and forth due to excessive inertial force acting on the seat, the nut member mounted on the vehicle-body-side rail, The screw member tries to move in the front-rear direction with respect to the screw member, and tries to move the screw member relatively in the front-rear direction.

The load that relatively moves the screw member in the front-rear direction is applied to the gear case in which the screw member is rotatably installed. This causes the gear case to slightly displace or deform in the front-rear direction.

When the gear case is displaced or deformed in the front-rear direction, the holding pieces are in contact with the front and rear of the gear case,
Since the holding piece is an integrated member cut and raised from the rail,
The front-back impact load applied to the gear case is transmitted from the pair of holding pieces to the rail body to be dispersed.

Even if the rigidity of the gear case is small, it is possible to sufficiently withstand an excessive impact load and the like.

When the power is transmitted to the drive unit, the screw member and the nut member move relatively in the front-rear direction, and the seat-side rail and the vehicle body-side rail move relatively in the front-rear direction. You can move in any direction to adjust the seat position.

[Embodiment] 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.

Seats on the floor 10 of the vehicle, as shown in FIGS. 1 and 2.
10a is mounted via a power seat slide device 20a so as to be adjustable in forward and backward movement.

The power seat slide device 20a has a pair of rail units 20, 20 which are arranged below both side portions of the seat 10a and extend in the front-rear direction. The rail unit 20 includes a vehicle body-side rail 21 fixedly mounted on the vehicle body floor 10 via leg members 12 and 13, and a seat-side rail 22 that is fitted to the vehicle-body side rail 21 so as to be movable back and forth and supports a seat. Made of.

The rail 21 on the vehicle body side is formed in a groove-shaped cross section, and has a bottom surface portion 23 and both side walls 24. Similarly, the seat-side rail 22 has a groove-shaped cross section and has a ceiling portion 25 and side walls 26.

The opening of the rail 21 on the vehicle body side and the opening of the rail 22 on the seat side are aligned, and the bottom portion 23 and the side walls 24 of the rail 21 on the vehicle body side are combined.
A space 20b is formed by being surrounded by the ceiling portion 25 of the seat-side rail 22 and the side walls 26.

As shown in FIGS. 1 and 2, the driving portion 3 is provided in the gap 20b.
0 is interpolated. The drive unit 30 has a screw member 31 extending in the front-rear direction and a nut member 32 screwed onto the screw member 31.

The nut member 32 is locked to the rail 21 on the vehicle body side so that it cannot be moved back and forth and is sandwiched by a stopper member 35 and a retaining member 36 from the front and rear direction. The bottom 32a of the nut member 32 is non-rotatably in contact with the bottom surface 23 of the seat-side rail 21.

The front end of the ceiling 25 of the seat-side rail 22 is raised to form a storage room 20c. A gear case 40, which is a component of the drive unit 30, is stored in the storage chamber 20c.

The gear case 40 is composed of a front case 41 and a rear case 42 that are divided into front and rear. Front case 41
The rear case 42 and the rear case 42 are formed substantially symmetrically.

A groove 43 for storing the worm 51 having a semicircular cross section is formed in the divided portion of the front case 41, and a groove 44 for storing the worm 51 having a semicircular cross section is formed in the divided portion of the rear case 42. ing. Further, holes 45 and 46 for inserting the pinion 52 are formed in the front case 41 and the rear case 42, respectively.

A pair of holding pieces 60, 60 for sandwiching the front case 41 and the rear case 42 in front and back and sandwiching them are formed on the rail 22 on the seat side. The holding pieces 60, 60 are formed by cutting and raising the face wall 25a of the seat-side rail 22 forming the storage portion 20c inward and facing each other inside the storage portion 20c.

The holding pieces 60, 60 are pressed against the front surface portion 47 of the front case 41 and the rear surface portion 48 of the rear case 42, respectively, and penetrate the front case 41 and the rear case 42 in the front-rear direction. Holes 49, 49 ... for inserting screws are formed at three places respectively. Through holes 61, 61 ... Are formed in the holding piece 60 so as to correspond to the insertion holes 49.

Through bolt 7 for each insertion hole 49 and each through hole 61, 61 ...
0 is penetrating each. The case 41 on the front side and the case 4 on the rear side are held by the holding pieces 60, 60 fastened to the through bolt 70.
The gear case 40, which is a combination of the two, is held.

A rear end portion of the screw member 31 is rotatably supported by a ceiling portion 25 of a seat-side rail 22 via a bearing member 33. Further, the front end portion of the screw member 31 is inserted into the gear case 40, and is rotatably supported by the ceiling portion 25 of the seat-side rail 22 via the gear case 40 and the holding pieces 60, 60.

The holding piece 60 has an insertion hole 62 for the screw member 31.

A worm 51 is rotatably installed in the gear case 40, and a worm wheel 52 that meshes with the worm 51 is installed. The worm wheel 52 is integrally rotatably fitted to the front end portion of the screw member 31 inserted into the gear case 40.

Anchor member at the rear end of the ceiling 25 of the rail 22 on the seat side
28 is riveted by rivets 29. Rivets 29
The two members, the anchor member 28 and the bearing member 33 with which the ceiling portion 25 is sandwiched, are fastened together.

Side wall 26 of rail 22 on the seat side of one rail unit 20
A drive motor 80, which is a rotary drive source, is mounted on the drive shaft via a support bracket 81, and the output shaft is output from the drive motor 80 in both directions.
The output shaft 82 is connected to the rotary shaft of the worm 51. The output shaft 82 extended to the rail unit 20 side is rotatably inserted in the pipe member 83 and the groove 43 for housing the worm 51.

Next, the operation will be described.

First, the assembling of the drive unit 30 will be described. Gear case
As for 40, a gear case 40 in which the screw member 31 is meshed with the worm wheel 52 through the insertion hole 62 in advance, the front case 41 and the rear case 42 are combined and integrated And

Then, the gear case 40 and the screw member 31 extending from the gear case 40 are inserted between the rail 21 on the vehicle body side and the rail 22 on the seat side, and the gear case 40 is positioned in the storage portion 20c.

The gear case 40 is inserted so as to be sandwiched between a pair of holding pieces 60, 60 formed by cutting and raising the face wall 25a of the seat-side rail 22 inward. Front case 41 and rear case 42
And are held between the holding pieces 60, 60 so as not to separate.

Therefore, holes 49, 49 for screw insertion and through-holes 61 for the holding piece 60,
The through bolt 70 is inserted through 61 ..., and the holding pieces 60, 60 and the gear case 40 are fastened and fixed. This completes the mounting of the gear case 40.

Next, the rail member 21 on the vehicle body side and the rail 22 on the seat side are slid relative to each other, and the nut member screwed into the screw member 31.
32 is set at a predetermined position on the rail 21 on the vehicle body side, and the nut member 32 is sandwiched from the front-rear direction by the stopper member 35 and the retaining member 36 to be locked on the rail 21 on the vehicle body side.

Further, a bearing member that pivotally supports the rear end of the screw member 31.
If 33 is fixed to the ceiling 25 of the rail 22 on the seat side, the drive unit 30
Assembly is completed.

When an excessive inertial force acts on the seat 10a due to a front-back collision or the like, the rail 21 on the vehicle body side and the rail 22 on the seat side tend to move relative to each other.

Due to the relative forward and backward movement of the vehicle body side rail 21 and the seat side rail 22, the nut member 36 locked to the vehicle body side rail 21 so as not to move forward and backward moves the screw member 31 in the longitudinal direction. try to.

When the screw member 31 tries to move relatively in the front-back direction, the movement is blocked by the gear case 40 that rotatably houses the screw member 31, whereby the gear case 40 tries to be displaced or deformed in the front-back direction. To do.

When the gear case 40 is displaced or deformed in the front-rear direction, the front part 47 of the front side case 41 and the rear side case 42 are
Since the holding pieces 60, 60 facing the rear surface portion 48 are in pressure contact with each other, the holding pieces 60, 60 prevent the gear case 40 from being displaced in the front-rear direction.

And the impact load in the front-back direction applied to the gear case 40 is
The holding pieces 60, 60 are transmitted to the seat-side rail 22 formed by cutting and raising the holding pieces 60, 60 to be dispersed and reliably received.

Further, since the pair of front and rear holding pieces 60 are connected via the through bolts 70, when one holding piece 60 is pushed from the gear case 40 side, the other holding piece 60 is pulled and the pair of holding pieces 60 is
Become deformed or displaced together rather than alone. Therefore, the impact load is further dispersed.

Even when the case 41 on the front side and the case 42 on the rear side of the gear case 40 are formed of a resin material and the rigidity thereof is relatively small, it is possible to sufficiently withstand an excessive impact load and the like.

When the drive motor 80 is started, the worm 51 rotates in conjunction with the output shaft 82, and the meshed worm wheel 52 rotates. When the worm wheel 52 rotates, the screw member 31 is rotationally driven.

Since the nut member 32 is non-rotatably and immovably locked to the rail 21 on the vehicle body side, when the screw member 31 rotates, the screw member 31 is gradually fed in the front-rear direction by the nut member 32.

As a result, the seat-side rail 22 moves in the front-rear direction with respect to the vehicle-body-side rail 21, whereby the seat moves in the front-rear direction and the position of the seat can be adjusted.

[Advantage of Invention] According to the power seat slide device of the present invention, since the pair of holding pieces facing each other cut from the rail holds the gear case in between, the bracket as a separate component is not required. The gear case is easy to assemble and the weight does not increase because there are no additional parts.

The impact load applied to the gear case in the case of a front-back collision is transferred from the holding piece to the rail and dispersed, and is not concentrated in the gear case, the rigidity that the gear case should have is reduced, and the gear case is made of resin material. It can be made lighter by molding or can be made smaller.

[Brief description of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is an exploded perspective view of a power seat slide device, and FIG. 2 is a perspective view showing a seat with the device mounted, FIG. 3 is a sectional view of a main part of a power seat slide device, and FIG. 4 is a partial sectional view of a power seat slide device according to a conventional example. 10 …… Body floor 20 …… Rail unit 20a …… Power seat slide device 20b …… Gap (storage space) 20c …… Storage room 21 …… Body side rail 22 …… Seat side rail 30 …… Driving section 31 …… Screw member 32 …… Nut member 40 …… Gear case 41 …… Front case 42 …… Rear case 51 …… Worm 52 …… Warm wheel 60 …… Holding piece 70 …… Through bolt 80 …… Drive motor

Claims (1)

[Scope of utility model registration request] 1. A vehicle body-side rail fixed to an installation site,
A rail unit having a seat-side rail for supporting a seat by being fitted to the rail on the vehicle-body side so as to be relatively movable back and forth, and the rail on the vehicle-body side and the seat-side rail via a drive unit by power. In a power seat slide device configured to move a rail relatively in the front-rear direction to adjust a front-back position of a seat, the rail on the vehicle body side and the rail on the seat side are each formed in a groove-shaped cross section, and While aligning the respective openings of the vehicle body side rail and the seat side rail with each other, a storage chamber is formed by the vehicle body side rail and the seat side rail by raising a part of one of the rails, The drive unit includes a screw member that is rotatably supported on one of the vehicle body side rail and the seat side rail and is rotatably supported along the longitudinal direction. A screw member that is screwed as much as possible and is supported by the other of the vehicle body-side rail and the seat-side rail, a worm that is rotatable by power, and the screw member that is meshed with the worm and that is integrally rotatable. And a gear case in which a worm wheel is installed, and a face wall of the rail on the seat side or the rail on the vehicle body side that forms the storage chamber is cut and raised inward so as to face each other inside the storage chamber. A power seat slide device characterized in that a pair of holding pieces are formed, and the pair of holding pieces hold a gear case from the front and the back to store the gear case of the drive unit in the storage chamber.