JP2010030345A - Seat sliding device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat sliding device for a vehicle, improved in safety. <P>SOLUTION: The seat sliding device for the vehicle includes: a gear 2 engaged with a worm 23 rotated by a motor; a lead screw 25 fixing the gear 2 at a distal end 25b via a collar 3 and a nut 27; a seat mounted on an upper rail slidably supported on a lower rail; a nut member screwed to the lead screw 25 and fixed to the lower rail; and a mounting bracket 5 for mounting a gear case 4 stored with the worm 23 and the gear 2 on the upper rail. In the seat sliding device, the gear 2 is fixed to a distal end part 25b of the lead screw 25 by screwing the nut 27 to the distal end 25a of the lead screw 25 projected to the outside from a mounting plate 6 of a gear case 4 via the collar 3, a rubber cap 40 is mounted in a flange part 3b of the collar 3, and the distal end 25a of the lead screw 25 and the nut 27 are covered with the rubber cap 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat slide device that slides a seat back and forth by driving a motor.

  FIG. 5 shows an example of this type of vehicle seat slide device, and FIG. 6 shows an example of a speed reduction mechanism thereof (see, for example, Patent Document 1).

  As shown in FIG. 5, the vehicle seat slide device 10 is fixed in parallel on a vehicle floor (not shown) so as to extend in the front-rear direction, and a pair of left and right lower rails (rails) having a nut member 12 fixed substantially at the center. ) 11 and 11 and a pair of guide members 14 and 14 that rotatably support a later-described lead screw 25 screwed to each nut member 12 are fixed, and are moved back and forth along the pair of left and right lower rails 11 and 11. A pair of left and right upper rails 13, 13 slidably supported on the left and right sides, a seat 15 attached to the pair of left and right upper rails 13, 13 via a mounting bracket (not shown), and a speed reducer that rotates each lead screw 25. Mechanism 20, each lead screw 25 is moved in the forward and reverse directions by driving the motor 21 that rotates forward and backward in the speed reduction mechanism 20. The sheet 15 attached between a pair of the left and right upper rails 13, 13 respectively are rotated are so as to slide in the front-rear direction. The seat 15 is inclined such that the front side is higher than the rear side.

  As shown in FIGS. 5 and 6, the speed reduction mechanism 20 of the vehicle seat slide device 10 is connected to a motor 21 and both ends of a rotating shaft 22 of the motor 21, and each worm 23 that rotates together with the rotating shaft 22. A resin-made cylindrical helical gear (gear) 24 that meshes with each worm 23, a lead screw 25 that fixes the helical gear 24 to the tip 25 b via a washer 26 and a nut 27, and each worm 23 In addition, each of the gear cases 28 made of resin that accommodates the helical gear 24 and the like is provided, and each gear case 28 is attached to each upper rail 13 via a metal attachment bracket 29.

  As shown in FIG. 6, the mounting bracket 29 is formed in a U-shaped cross section with both side wall portions 29a and 29b and a ceiling wall portion 29c. Through holes 29e and 29d through which the lead screw 25 penetrates are formed in one side wall portion 29b and the other side wall portion 29a of the mounting bracket 29, and a mounting piece 13a of the upper rail 13 is illustrated in the ceiling wall portion 29c. A pair of female screw holes 29f, 29f for mounting with screws that are not used are formed.

  A gear case 28 is disposed between the side wall portions 29 a and 29 b of the mounting bracket 29. The leading end 25a of the lead screw 25 is projected outside the one side wall portion 29b of the mounting bracket 29, and the nut 27 is screwed into the threaded portion formed on the leading end 25a via the washer 26, thereby leading the helical gear 24. It is fixed to the tip 25b of the screw 25.

  Furthermore, a metal-made cylindrical collar 30 is attached to the tip portion 25 b of the lead screw 25 between the washer 26 and the helical gear 24. An annular recess 30 b is formed on the outer peripheral surface 30 a of the collar 30. The rubber O-ring 31 fitted in the recess 30b of the collar 30 is slidable with respect to the inner peripheral surface 32a of the metal bearing 32 fitted on the side wall portion 29b side of the mounting hole 28a of the gear case 28. It is. The tip 25a side of the tip 25b of the lead screw 25 is rotatably supported by a bearing 32.

  Further, the proximal end side of the distal end portion 25 b of the lead screw 25 is rotatably supported by a ball bearing 33 fitted in the mounting hole 28 a of the gear case 28. Thus, the helical gear 24 is formed between the collar 30 and the ball bearing 33 at the tip portion 25b of the lead screw 25, and is formed on the tip 25a with a metal washer 26 inserted into the tip 25a of the lead screw 25. The lead screw 25 is fixed to the distal end portion 25b through a nut 27 that is screwed into the male screw portion.

Japanese Patent No. 3954949 (FIGS. 1 and 2)

  In the conventional vehicle seat slide device 10, the leading end 25 a of the lead screw 25 protruding outward from the one side wall portion 29 b of the mounting bracket 29 and the nut 27 screwed to the leading end 25 a are exposed at a position close to the occupant's feet. For this reason, a resin cover for preventing danger has been assembled and covered on the exposed rotating part, but the assemblability is poor and the cost is high.

  Therefore, the present invention has been made to solve the above-described problems, and can easily and reliably cover the tip of the lead screw protruding outward from the gear case and the nut screwed to the tip easily and at low cost. An object of the present invention is to provide a vehicle seat slide device capable of improving safety.

  According to the first aspect of the present invention, there are provided a motor that rotates forward and backward, a worm that is rotated by driving the motor, a gear that meshes with the worm, and a lead screw that has the gear fixed to a tip portion via a collar and a nut. And a gear case storing the worm and the gear, respectively, and a nut member screwed into the lead screw, and the lead screw is rotated by driving the motor so as to slide the seat in the front-rear direction. In the vehicle seat slide device, a collar is formed on the collar, a rubber cap is detachably attached to the collar, and the tip of the lead screw and the nut are covered with the rubber cap. To do.

  According to a second aspect of the present invention, there is provided the vehicle seat slide device according to the first aspect, wherein the rubber cap is sandwiched between a covering body that covers a tip of the lead screw and the nut, and a collar portion of the collar. A wide fitting body to be fitted is formed, and a plurality of holes are formed in a central peripheral wall portion of the wide fitting body.

  As described above, according to the first aspect of the present invention, the collar is formed with the collar, the rubber cap is detachably attached to the collar, and the tip of the lead screw and the nut are covered with the rubber cap. As a result, the tip of the lead screw protruding outward from the gear case and the nut screwed to the tip can be reliably and simply covered at low cost, and safety can be improved.

  According to the invention of claim 2, the rubber cap is composed of a covering body that covers the tip of the lead screw and the nut, and a wide fitting body that is fitted so as to sandwich the collar portion of the collar, and the center of the wide fitting body By forming a plurality of holes in the peripheral wall, the tip of the lead screw that protrudes outward from the gear case and the nut that is screwed to the tip can be more easily and reliably assembled and covered, making it safer. It is possible to improve the performance.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 is a cross-sectional view showing a speed reduction mechanism of a vehicle seat slide device according to an embodiment of the present invention, FIG. 2 is a plan view of a rubber cap used in the speed reduction mechanism, and FIG. 3 is taken along line YY in FIG. Sectional drawing and FIG. 4 are perspective views of the cap, and the vehicle seat slide device shown in FIG. 5 is used.

  As shown in FIG. 1, the speed reduction mechanism 1 of the vehicle seat slide device 10 includes a worm 23 that is rotated by a motor 21, a resin-made cylindrical helical gear (gear) 2 that meshes with the worm 23, and the helical gear 2. The lead screw 25 is fixed to the distal end portion 25b through a metal-made cylindrical collar 3 and a nut 27, and the resin gear case 4 in which the worm 23 and the helical gear 2 are respectively housed.

  The gear case 4 is fixed to a mounting bracket 5 that is attached to the upper rail 13. That is, the gear case 4 is fastened and fixed via the mounting plate 6 and the plurality of screws 7 to the outside of the wall portion 5 a that penetrates the tip end portion 25 b of the lead screw 25 of the mounting bracket 5. Further, the helical gear 2 is engaged with a stepped portion 25 c of a metal-made cylindrical collar 3 and a tip portion 25 b of the lead screw 25 that are pressed by a nut 27 that is screwed into a screw portion formed at the tip 25 a of the lead screw 25. It is fixed to the leading end portion 25b of the lead screw 25 through the stopped spacer 8 so as not to rotate but to move in the axial direction. Further, both sides of the helical gear 2 in the gear case 4 are rotatably supported by a pair of bearings 9a and 9b.

  Further, as shown in FIG. 5, a male screw portion 25 d is formed in the middle of the lead screw 25, and the nut member 12 screwed into the male screw portion 25 d is fixed to the lower rail 11. When the lead screw 25 is rotated through the worm 23 and the helical gear 2 by driving the motor 21, the upper rail 13 slides with respect to the lower rail 11, so that the seat 15 attached to the upper rail 13 moves back and forth. Slide to move to.

  As shown in FIG. 1, the cylindrical body 3b of the collar 3 that fixes the helical gear 2 to the tip 25b of the lead screw 25 so that it cannot rotate and cannot move in the axial direction, and the thread of the tip 25a of the lead screw 25 The nut 27 and the tip 25a of the lead screw 25 that are screwed together are protruded (exposed) outward from the mounting plate 6 of the gear case 4. A rubber cap 40 is detachably attached to the annular plate-shaped flange portion 3b with which the nut 27 of the collar 3 abuts.

  As shown in FIGS. 1 to 4, the rubber cap 40 includes a cylindrical covering body 41 having a ceiling portion that covers a tip 25 a of the lead screw 25 and a nut 27 screwed to the tip 25 a, and a collar 3. It is composed of a cylindrical wide fitting body 42 having a U-shaped cross section that is fitted so as to sandwich the annular plate-shaped flange portion 3b. Four substantially rectangular holes 43 are formed in the central peripheral wall portion 42a of the wide fitting body 42, respectively.

  According to the vehicle seat slide device 10 including the speed reduction mechanism 1 of the above embodiment, the nut 27 is screwed through the collar 3 to the tip 25a of the lead screw 25 protruding outward from the mounting plate 6 of the gear case 4. The helical gear 2 is fixed to the tip 25b of the lead screw 25, and the rubber cap 40 is assembled to the collar 3b of the collar 3 with the collar 3 and the rubber cap 40 covers the tip 25a of the lead screw 25 and the nut 27. As a result, the tip 25a of the lead screw 25 protruding outward from the mounting plate 6 of the gear case 4 and the nut 27 screwed to the tip 25a can be easily and reliably covered at low cost, thereby improving safety. be able to. The rubber cap 40 itself can be reduced in size by assembling the rubber cap 40 to the collar 3.

  Further, the rubber cap 40 includes a covering body 41 that covers the tip 25a of the lead screw 25 and the nut 27, and a wide fitting body 42 that is fitted so as to sandwich the collar portion 3b of the collar 3, and the wide fitting body 42. By forming four substantially rectangular holes 43 in the central peripheral wall portion 42a, the leading end 25a of the lead screw 25 protruding outward from the mounting plate 6 of the gear case 4 and the nut 27 screwed into the leading end 25a are more Assembling and covering can be more reliably and easily performed at low cost, and safety can be improved.

  Further, by attaching the rubber cap 40 to the collar 3, the rubber cap 40 can be attached during the manufacturing process of the vehicle seat slide device 10, and by using the rubber cap 40, the vehicle seat slide provided with the speed reduction mechanism 1. When the apparatus 10 is transported, it is possible to reliably prevent the rubber cap 40 from falling off the collar 3b of the collar 3.

  In addition, according to the said embodiment, although the four substantially rectangular holes were formed in the surrounding wall part of the wide fitting body of a rubber cap, the number of holes may be four or more and the shape of a hole is substantially rectangular shape. It is not limited to.

It is sectional drawing which shows the deceleration mechanism of the vehicle seat slide apparatus of one Embodiment of this invention. It is a top view of the rubber cap used for the said deceleration mechanism. It is sectional drawing which follows the YY line in FIG. It is a perspective view of the said cap. It is a top view of a seat slide device for vehicles. It is sectional drawing of the deceleration mechanism of the conventional vehicle seat slide apparatus.

Explanation of symbols

1 Reduction mechanism 2 Helical gear (gear)
3 collar 3b collar 4 gear case 5 mounting bracket 10 vehicle seat slide device 11 lower rail 12 nut member 13 upper rail 15 seat 21 motor 23 worm 25 lead screw 25a tip 25b tip portion 27 nut 40 rubber cap 41 covering body 42 wide fitting body 42a peripheral wall 43 holes

Claims (2)

A motor that rotates forward and backward, a worm that rotates by driving the motor, a gear that meshes with the worm, a lead screw that fixes the gear to the tip via a collar and a nut, and the worm and gear In a vehicle seat slide device comprising a gear case accommodated in each case and a nut member screwed to the lead screw, wherein the lead screw is rotated by driving the motor to slide the seat back and forth. ,
A vehicular seat slide device, wherein a collar is formed on the collar, a rubber cap is detachably attached to the collar, and the tip of the lead screw and the nut are covered with the rubber cap. The vehicle seat slide device according to claim 1,
The rubber cap is composed of a covering body that covers the tip of the lead screw and the nut, and a wide fitting body that is fitted so as to sandwich a collar portion of the collar, and a plurality of rubber caps are provided on a central peripheral wall portion of the wide fitting body. A vehicle seat slide device characterized in that a hole is formed.

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