JP2007069694A - Seat slide device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress the generation of noise while insuring smooth seat slide. <P>SOLUTION: The seat slide device for a vehicle comprises a lower rail 1 formed to have a generally U-shaped cross section, and bending right and left opening edges inward in opposite directions to form a top wall 12 generally parallel with a bottom wall 11; an upper rail 2 provided with main rollers at both end portions in a longitudinal direction, and moving along the lower rail 1 due to rolling on the bottom wall 11 of the main rollers; sub rollers 34 provided neat the main rollers; and coil spring 32 energizing the sub rollers 34 to abut on the top wall 12, and making the main rollers abut on the bottom wall 11 by reaction force which the sub rollers 34 receive at that time. The sub rollers 34 are rotatably supported at both ends of a shaft element 341 crossing and penetrating a cover element 33, and the cover element 33 and the shaft element 341 are guided by a guide hole 314 and a guide protrusion 313 so as to vertically move in a predetermined range. The coil spring 32 energizes the cover element 33 upward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle seat slide device, and more particularly, to a structural improvement of a seat slide device that does not generate abnormal noise due to vehicle vibration or the like.

  BACKGROUND ART A vehicle seat slide device usually includes a long lower rail and an upper rail that is movably mounted on the lower rail and supports a seat body. An example is shown in FIGS. 13 and 14, in which the lower rail 1 is formed in a substantially U-shaped cross section (FIG. 14), and the left and right opening edges are bent inward in the opposite direction so as to be substantially parallel to the bottom wall 11. It has become. The upper rail 2 is a standing posture in which two long plates (FIG. 13) having a predetermined length are stacked, and the lower edge thereof is located in the lower rail 1. A shaft body 21 is provided at the front and rear end portions of the lower edge horizontally through the plate surface, and roller bodies 22 are attached to both ends thereof. In this case, the interval between the bottom wall 11 and the top wall 12 is slightly larger than the outer diameter of the roller body 22 so that the roller body 22 rotates smoothly in the lower rail 1 and is located on the bottom wall 11. A gap S is generated between the roller body 22 and the top wall 12. The upper rail 2 is positioned by the lower end 231 of the stopper member 23 (FIG. 13) provided at the center portion entering the locking hole of the lower rail bottom wall 11. The stopper member 23 is pulled up as the operating lever 24 provided on the upper rail 2 is turned, and the lower end 231 thereof is made to escape from the locking hole, so that the upper rail 2 can move.

  By the way, when vehicle vibration or the like is input, the roller body 22 reciprocates vertically in the lower rail 1 and hits the bottom wall 11 or the top wall 12 to generate noise. Therefore, conventionally, vibration preventing tools 4 are attached to the front and rear ends of the upper rail 2. The vibration preventing tool 4 is an integrally molded product of resin as shown in FIG. 15, and a mounting portion 41 to the end of the upper rail 2 is formed in the center, and contact pieces 42 are formed on both sides thereof. The contact piece 42 extends from a base end 421 continuous with the mounting portion 41 while a tip 422 is curved upward, and a tip 422 surface that bulges upward is elastically in contact with the lower surface of the top wall 12 of the lower rail 1 (FIG. 13). ). Then, the roller body 22 is pressed against the bottom wall 11 of the lower rail 1 by the reaction force at the time of the elastic contact, so that the roller body 22 is prevented from floating even if vibration is input, and the generation of abnormal noise is prevented. .

Patent Document 1 discloses a seat slide device in which a resin slider in contact with the upper wall is provided at one end of a lever member that is biased toward the upper wall (top wall) of the lower rail.
4-41417

  However, in the conventional seat slide device described above, the degree of the elastic contact force of the contact piece 42 changes due to manufacturing variations of the lower rail 1 and the upper rail 2, so that the effect of suppressing abnormal noise fluctuates and it is difficult to manage. Further, if the elastic contact force of the contact piece 42 is increased in order to exert a sufficient noise suppression effect, there is a problem that the resistance during sliding becomes excessive and the usability of the sheet is lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat slide device that can effectively suppress abnormal noise generation while always guaranteeing a smooth seat slide.

  In order to achieve the above object, in the present invention, a lower rail (1) having a substantially U-shaped cross section and having a top wall (12) substantially parallel to the bottom wall (11), and main rollers at both longitudinal ends. (22) is provided, and the main roller (22) rolls on the bottom wall (11) to move along the lower rail (1), and is provided in the vicinity of the main roller (22). The auxiliary roller (34) and the auxiliary roller (34) are urged upward to come into contact with the top wall (12). At this time, the reaction force received by the auxiliary roller (34) causes the main roller (22) to move to the bottom wall. And an urging member (32) to be brought into contact with (11). In this case, a shaft body (341) that rotatably supports the sub roller (34) and a guide portion (314, 313) that guides the shaft body (341) so as to be movable in a certain range in the vertical direction are further provided. The urging member (32) may urge the shaft body (341) upward.

  In the present invention, the main roller is brought into contact with the bottom wall of the lower rail with a constant reaction force. As a result, even if vibration is input, the main roller does not lift up, and the main roller vibrates up and down within the lower rail. Sound is effectively prevented. In the present invention, since the reaction force is obtained by pressing the rotatable sub-roller against the top wall, even if a sufficiently large reaction force is obtained, the smoothness of the seat slide is not impaired.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the vehicle seat slide device of the present invention, it is possible to effectively suppress the occurrence of abnormal noise while ensuring a smooth seat slide.

  In FIG. 1, the basic structure of the upper rail 2 is the same as that of the conventional one already described (see FIG. 13), and a shaft body 21 is provided horizontally through the plate surface at the front and rear end portions of the lower edge. The same main roller 22 as the conventional roller body is mounted, and the upper rail 2 moves when these main rollers 22 roll on the bottom wall 11 of the lower rail 1. In the present embodiment, vibration preventing mechanisms 3 having the same structure are provided at the front and rear ends of the upper rail 2, respectively. Details of the vibration preventing mechanism 3 are shown in FIGS.

  The vibration preventing mechanism 3 includes a support arm 31 that protrudes outward from the end of the upper rail 2 in the longitudinal direction. As shown in the side view of FIG. 6 and the plan view of FIG. 7, the support arm 31 is a plate body in a standing posture, and is curved downward so as to avoid the shaft body 21 of the main roller 22 (FIG. 2). A base 311 that is welded and fixed to the side surface of the upper rail 2 and a tip 312 that is bent horizontally from the base 311 and reaches the center of the upper rail 2 in plan view (FIG. 3). A guide protrusion 313 that protrudes upward is formed at the distal end portion 312, and an elongated guide hole 314 that extends in the vertical direction is formed on a plate surface below the guide protrusion 313.

  A coil spring 32 is fitted around the guide projection 313 from above (FIG. 5), and its lower end is located on the top surface of the distal end portion 312 of the support arm 31 (FIG. 2). A cover body 33 is attached to the coil spring 32 from above. As shown in FIGS. 8 to 10, the cover body 33 is a rectangular cylinder that opens downward, and a slit hole 331 is formed in the top wall (FIG. 8), and a guide projection 313 is inserted therein (FIG. 8). 2). Cuts 332 are formed in the front and rear side walls of the cover body 33 (FIG. 9), and the support arm 31 body is located here (FIG. 4). A circular opening 333 is formed in the left and right side walls of the cover body 33 (FIG. 10), and a shaft body 341 passes therethrough, and the shaft body 341 passes through the guide hole 314 of the support arm 31 (FIG. 4). ). A sub roller 34 is rotatably mounted on both ends of the shaft body 341 via bushes 342. The cover body 33 is lifted upward by the urging force of the coil spring 32, and when the upper rail 2 is mounted on the lower rail 1, the secondary roller 34 contacts the upper wall 12 of the opening edge of the lower rail 1 as shown in FIG. 4. The cover body 33 is pressed down, the coil spring 32 is compressed, and the shaft body 333 is near the center of the guide hole 314. In this state, the sub roller 34 receives a reaction force equal to the urging force of the coil spring 32 from the upper wall 12, and the main roller 22 is pressed against the bottom wall 11 of the lower rail 1 by this reaction force.

  As a result of the main roller 22 being pressed against the bottom wall 11 of the lower rail 1 with a constant reaction force, the main roller 22 does not lift up even if vibration is input, and the main roller 22 vibrates up and down within the lower rail 1. The abnormal noise which arises is prevented beforehand. In this embodiment, the sub-roller 34 that is rotatable is pressed against the top wall 12 to obtain a reaction force. Therefore, even if a sufficiently large reaction force is obtained, the smoothness of the seat slide is not impaired. By the way, when a reaction force of 15 kgf that can reliably prevent the main roller 22 from being lifted is obtained, the resistance load at the time of sliding is about 4 kgf in the conventional structure, whereas in the structure of the present embodiment, 0.4 kgf. It becomes small enough.

  In order to set the upper rail 1 provided with the vibration preventing mechanism 3 in the lower rail 1 with the cover body 22 pushed down and the coil spring 32 compressed, the front end of the upper rail 2 is first moved forward as shown in FIG. By tilting downward, the height of the sub roller 34 of the front vibration preventing mechanism 3 is made lower than the top wall 12 of the lower rail 1, and in this state, the posture of the upper rail 2 is made horizontal while the sub roller 34 is inserted into the lower rail 1. Return to posture. In the case of the rear vibration preventing mechanism 3, even if the height of the sub roller 34 is slightly higher than the top wall 12 of the lower rail 1 as shown in FIG. 12, the upper rail 2 is moved to the lower rail 1 with a relatively small force. If it is pushed along, the outer peripheral surface of the secondary roller 34 comes into contact with the end of the top wall 12 of the lower rail 1 at a certain downward inclination angle. Therefore, the secondary roller 34 can be easily pushed into the lower rail 1 while compressing the coil spring 32. Can do.

It is the whole upper rail side view showing one embodiment of the present invention. It is a principal part side view of the vibration prevention mechanism installation part of an upper rail. FIG. 3 is a horizontal sectional view taken along line III-III in FIG. 2. FIG. 4 is a vertical sectional view taken along line IV-IV in FIG. 2. It is a disassembled perspective view of a vibration preventing mechanism. It is a side view of a support arm. It is a top view of a support arm. It is a top view of a cover body. It is a side view of the cover body seen from the X direction of FIG. It is a side view of the cover body seen from the Y direction of FIG. It is a side view at the time of attaching an upper rail to a lower rail. It is a side view at the time of attaching an upper rail to a lower rail. It is the whole upper rail side view which shows a prior art example. It is a vertical sectional view of a seat slide device. It is a perspective view of a vibration preventing tool.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lower rail, 11 ... Bottom wall, 12 ... Top wall, 2 ... Upper rail, 22 ... Main roller, 3 ... Vibration prevention mechanism, 32 ... Coil spring, 34 .. Sub-roller, 313 ... guide protrusion, 314 ... guide hole, 341 ... shaft.

Claims (2)

The lower rail is formed in a substantially U-shaped cross section and has a top wall substantially parallel to the bottom wall, and main rollers are provided at both ends in the longitudinal direction, and the main rollers roll on the bottom wall along the lower rail. A moving upper rail, a sub-roller provided in the vicinity of the main roller, and a sub-roller are urged upward to abut against the top wall. At this time, the main roller is moved by the reaction force received by the sub-roller. A vehicle seat slide device comprising an urging member that abuts against a bottom wall. A shaft body that rotatably supports the sub-roller, and a guide portion that guides the shaft body so as to be movable in a certain range in the vertical direction, and the biasing member biases the shaft body upward. The vehicle seat slide device according to claim 1.

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