JP2013107487A - Vehicle seat with lifter mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat with a lifter mechanism capable of supporting a seat cushion with high stability.SOLUTION: The lifter mechanism comprising pairs of right and left height adjusting means in a front side and a rear side of the seat cushion is arranged between a vehicle floor surface and the seat cushion. In the four height adjusting means, upper ends are attached to the seat cushion side and lower ends have lifter link members attached to the vehicle floor surface, respectively. Gear teeth are formed in the respective lifter link members and mesh with gears rotatably attached to the floor surface side or the seat cushion side. The rotation the gears of the pair of front side height adjusting means are mutually synchronized by a transmission mechanism and the rotation of the gears of the pair of rear side height adjusting means are also mutually synchronized by a transmission mechanism.

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a lifter mechanism that can adjust the height of a seat cushion on which a passenger sits in the vehicle relative to the vehicle floor.

  For example, Patent Document 1 discloses a height adjustment device for adjusting the height of a seat body in a conventional vehicle seat. As shown in FIG. 6, a pair of left and right front lifter links 480 and a pair of left and right front lifters are provided. A rear lifter link 490 is rotatably mounted between the upper rail 461 of the sliding means 460 and the lower arm 440 of the seat cushion 420. Further, a sector gear 490c is formed integrally with one of the rear lifter links 490, and the lifter link 490 is tilted by rotating the pinion gear 490b meshed with the sector gear. Usually, a lock mechanism including a sector gear and a pinion gear is provided only on one of the rear lifter links. The other rear lifter link and the pair of front lifter links are not provided with a lock mechanism.

JP 2011-173696 A

  In the lifter mechanism as described above, only one of the four lifter links is provided with a lock mechanism for fixing the inclination of the lifter link, and the load applied to the seat cushion is applied at one place on the rear side of the seat cushion. It is in a state of paying. For this reason, the support of the seat cushion is very unstable, and may give a sense of rocking to the seated person. In this situation, in order to increase the stability of the seat cushion and the lifter mechanism, the rigidity of the left and right cushion frames 420 of the seat cushion and the connecting members 420a and 420b that connect them are increased. There is a limit to improving the stability of the seat cushion.

  A problem to be solved by the present invention is a lifter mechanism capable of stably bearing a load applied to a seat cushion in a vehicle seat in which the seat cushion is supported on the under frame so as to be movable up and down via the lifter mechanism. The object is to provide a vehicular seat.

  In order to solve the above-described problem, a vehicle seat with a lifter mechanism according to claim 1 of the present invention is such that a seat cushion is supported by an underframe that supports the seat cushion so as to be movable up and down via the lifter mechanism. The mechanism is provided with a front height adjusting means for adjusting the height position of the front part of the pair of left and right seat cushions, and further behind the front height adjusting means, the height of the rear part of the pair of left and right seat cushions is provided. Rear height adjusting means for adjusting the position is provided, and each of the front height adjusting means and the rear height adjusting means has an upper end portion attached to the seat cushion and a lower end portion attached to the underframe. The lifter link member attached to the front frame is pivoted to the underframe or the seat cushion at one end of the lifter link member. Gears meshing with gears attached to the function, both gears of the front height adjusting means are rotated synchronously with each other by the first transmission mechanism, and both gears of the rear height adjusting means are rotated. The gist is that the second transmission mechanism is configured to be synchronously rotated with each other.

  Here, the vehicle seat according to claim 2 further includes a pair of left and right slide means each having a lower rail fixed to the floor surface and an upper rail engaged with the lower rail so as to be slidable in the front-rear direction. The underframe is fixed on the upper rail, and an upper first gear tooth is formed on the outer surface of the lower rail. A first gear coaxially and integrally fixed to the underframe; A second gear is rotatably mounted, the first gear is meshed with the first gear teeth, the lifter link member is connected to a seat cushion at a bent portion provided in the middle portion, and from the bent portion A second gear tooth is integrally formed on the front surface of the end portion of the rear link bar that extends rearward and downward, and meshes with the second gear, and extends forward and downward from the bent portion. The end of the link bar is attached to the upper rail so as to be slidable in the longitudinal direction through the guide member and rotatable in a plane including the lifter link member, and the left and right upper rails move in the front-rear direction with respect to the lower rail. Then, the first gears of the pair of front height adjusting means and the first gears of the pair of rear height adjusting means are configured to rotate synchronously on the left and right.

  According to the vehicle seat with a lifter mechanism according to claim 1 of the present application, the meshing structure of the gear and the gear teeth acts as a lock mechanism for fixing the movement of the lifter link member, and such a lock mechanism has four locations on the seat cushion. By being provided in, the load given to a seat cushion can be disperse | distributed to four places and can be borne. Thereby, the feeling of rocking given to the seated person is greatly reduced as compared with the case where the cushion seat is stably held and the lock mechanism is provided only at one place. Further, since the rotations of the pair of left and right gears are synchronized with each other, it is not necessary to individually operate the left and right height adjusting means, and the operability is excellent.

  According to the vehicle seat with a lifter mechanism according to claim 2 of the present application, the four height adjusting means can be operated simply by sliding the upper rail of the sliding means relative to the lower rail, and the lever, motor The seat cushion can be moved up and down without using a lifter adjusting device such as the above.

1 is a perspective view of a vehicle seat with a lifter mechanism according to a first embodiment of the present invention. It is a perspective view of the vehicle seat with a lifter mechanism concerning 2nd embodiment of this invention. It is a side view of the height adjustment means in FIG. It is a side view of the vehicle seat with a lifter mechanism concerning 3rd embodiment of this invention. (A) is an expanded side view of the height adjustment means in FIG. 4, (b) is AA sectional drawing of (a). It is a perspective view of the conventional vehicle seat.

  Hereinafter, a vehicle seat with a lifter mechanism according to an embodiment of the present invention will be described in detail with reference to the drawings. A vehicle seat 1 with a lifter mechanism according to the first embodiment shown in FIG. 1 has a seat cushion 2 and a seat back 3 behind the seat cushion 2.

  The seat cushion 2 has a frame including a lower arm 4 and the like extending in the front-rear direction at the left and right portions. A pad (not shown) is attached to the frame. The left and right lower arms 4 are connected by connecting members 2a and 2b. Below the lower arm 4 is provided a slide means 5 having a lower rail 52 fixed to the vehicle floor and an upper rail 51 slidably engaged with the lower rail 52. An underframe 6 is fixed to the upper surface of the upper rail 51, and a lifter mechanism 7 is attached between the underframe 6 and the lower arm 4.

  The lifter mechanism 7 includes a pair of left and right front height adjusting means 8 in front of the seat and a pair of left and right rear height adjusting means 9 in the rear of the seat. The pair of front height adjusting means 8 and the pair of rear height adjusting means 9 all have the same configuration. One rear height adjusting means 9 will be described as an example. The height adjusting means 9 has a lifter link 9a. The lifter link 9a has an upper end portion rotatably attached to the lower arm 4 and a lower end portion rotatably connected to the underframe 6. Further, a substantially sector-shaped sector gear 9c having teeth on the front side is integrally formed at the front end portion of the lifter link 9a. The sector gear 9c is meshed with a pinion gear 9b attached to the lower arm 4 so as to be rotatable about the shaft. The tilting of the lifter link 9a is locked by this meshing structure. Since the lifter mechanism 7 has lock mechanisms at four locations, the load applied to the seat cushion 2 is supported with high stability.

  Further, the shaft of the pinion gear 9b of the pair of rear height adjusting means 9 installed on the left and right sides of the seat is connected by a linear shaft connecting member 91, and is connected to one of the two pinion gears 9b to which the shaft is connected. The handle 92 is connected. By operating the handle 92, the pinion gears 9b of the pair of left and right height adjusting means are rotated in synchronization. By rotation of the pinion gear 9b, the left and right sector gears 9c are rotated, and the left and right lifter links 9a are tilted. Similarly, the shafts of the pinion gears of the pair of front height adjusting means 8 are coupled to each other, and a handle 82 is connected to one of the pinion gears. As a result, the entire seat can be raised and lowered by operating the handles at the front and rear positions. Here, a motor may be connected to the front and rear height adjusting means 8 and 9 instead of the handle.

  FIG. 2 shows a vehicle seat 100 with a lifter mechanism according to the second embodiment. In the first embodiment, instead of having a configuration in which the front height adjusting means and the rear height adjusting means include the lifter link, the sector gear, and the pinion gear, the pair of front height adjusting means 180 and the pair of rear height adjusting means are provided. The side height adjusting means 190 includes a substantially L-shaped bent lifter link and a rack and pinion gear.

  Since the four height adjusting means all have the same configuration, the configuration will be described below with reference to FIGS. 2 and 3 by taking the rear height adjusting means 190 as an example. The bent lifter link 191 is bent at an intermediate position, and has a substantially L-shape with link bars 191b and 191c extending on both sides of the bent portion 191a. In this embodiment, this bending angle is 90 °. Both the front link bar 191b and the rear link bar 191c are in a plane perpendicular to the vehicle floor.

  A bent portion 191a that is an upper end portion of the bent lifter link 191 is connected to the lower arm 140 by a pin member 191f. On the other hand, a rack gear 191d is integrally formed at the end of the rear link bar 191c, and meshes with a pinion gear 192 attached to the under frame 160 so as to be capable of rotating the shaft. The rack gear 191d is held at a position where the rack gear 191d meshes with the pinion gear 192 by a holding member 191e attached to the under frame 160 so as to be rotatable in-plane by a pin member 191g.

  An end portion of the front link bar 191b is inserted through a guide member 193 attached to the under frame 160. The guide member 193 is supported from two side surfaces by a bracket 193a having a substantially U-shaped cross section perpendicular to the insertion direction of the front link bar 191b. The bracket 193a is rotatably attached to the under frame 160 by a pin member (not shown) on the inner surface of the guide member 193. With this configuration, the guide member 193 can rotate in a plane including the bent lifter link 191 and can slide the inserted front side link bar 191b.

  Further, the shafts of the pinion gears 192 of the pair of rear side height adjusting means 190 installed on the left and right sides of the seat cushion are connected by a linear shaft connecting member 194, and one of the two pinion gears 192 to which the shafts are connected. Further, a handle 195 for driving the pinion gear 192 is connected. Here, a motor may be connected instead of the handle 195.

  The position of the bent portion 191a is locked by the meshing of the rack gear 191d and the pinion gear 192. When the pinion gear 192 is rotated, the rack gear 191d moves in translation. When the rack gear 191d translates forward and upward, the height position of the bent portion 191a moves upward. At this time, the position of the meshing portion of the rack gear 191d and the pinion gear 192 on the underframe 160 and the position of the guide member 193 are defined, and the angle formed by the two link bars 191b and 191c at the bent portion 191a is fixed. Therefore, the movement locus of the bent portion 191a is limited. A right-angled vertex of a right triangle having two fixed points as hypotenuses always exists on an arc centered at the midpoint of the two points. That is, the bent portion 191 a of the bent lifter link moves on a virtual arc centered on the midpoint between the meshing position of the rack gear 191 d and the pinion gear 192 and the position of the guide member 193.

  When the rack gear 191d is translated by driving the pinion gear 192, and the length of the rear link bar 191c from the bent portion 191a to the meshing position of the rack gear 191d and the pinion gear 192 is changed, the bent portion 191a In order to keep it upward, the rear link bar 191c is rotated in the front-rear direction around the meshing portion of the pinion gear 192 and the rack gear 191d. This rotational movement is realized by the holding member 191e being rotatably attached to the under frame 160.

  The guide member 193 rotates together with the bracket 193a so that the bent portion 191a is maintained on the arc by following the translational motion and the rotational motion of the rack gear 191d, and the front link bar inserted through the guide member 193 is further provided. Sliding 191b occurs. In this way, by the cooperation of the rack-pinion gear 192 and the guide member 193, the bent portion 191a rotates on the arc. At this time, the seat is moved up and down by changing the vertical position of the bent portion 191a.

  Further, since the shafts of the pinion gears 192 of the pair of rear height adjusting means 190 installed on the left and right sides of the seat are connected by the linear shaft connecting member 194, when the handle 195 is operated, the pair of left and right The pinion gear 192 of the rear height adjusting means 190 is rotated synchronously. The vertical positions of the bent portions 191a of the left and right bent lifter links 191 change synchronously. Similarly, the pinion gear shafts of the pair of front side height adjusting means 180 are coupled, and a handle 185 is connected to one pinion gear. As a result, the entire seat can be raised and lowered by operating the handles at the front and rear positions.

  Here, in the height adjusting means 9 using the tilt type lifter link according to the first embodiment, it is necessary to bear all the load applied to the seat cushion at the meshing portion of the sector gear 9c and the pinion gear 9b. When the bent lifter link 191 according to the present embodiment is used, the load is applied in the direction in which the rear link bar 191c is compressed in the longitudinal direction, so that the load can be supported by the entire rear link bar 191c. Therefore, the lifter mechanism according to the present embodiment is more excellent in the stability of sheet holding.

  FIG. 4 shows a vehicle seat 200 with a lifter mechanism according to a third embodiment of the present invention. The lifter mechanism 270 includes a pair of left and right front height adjusting means 280 installed at the front of the seat and a pair of left and right rear height adjusting means 290 installed at the rear of the seat, and a lower rail of the pair of left and right sliding means 250. An upward first gear tooth 252a formed on the upper surface of 252 is provided. The first gear teeth 252a formed on the left and right lower rails 252 have the same number of teeth.

  Since the front and rear height adjusting means 280 and 290 have the same configuration, the configuration will be described using the rear height adjusting means 290 as an example. The rear height adjusting means 290 includes a bent lifter link 291 and a guide member 293 similar to those used in the second embodiment. The bent portion 291a of the bent lifter link 291 is connected to the lower arm 240, the front link bar 291b is inserted into the guide member 293 so as to be slidable in the longitudinal direction, and the guide member 293 is the same as the bracket 193a in the second embodiment. A bracket 293a having a substantially U-shaped cross section is attached to the underframe 260 so as to be rotatable in a plane including the bent lifter link 291.

  FIG. 5 shows an enlarged view of the vicinity of the end of the rear link bar 291c. The height adjusting means 290 is further supported coaxially with the first gear 294 and the first gear 294, and is integrated with the first gear 294. And a second gear 295 that rotates. The first gear 294 and the second gear 295 are attached to an under frame 260 fixed to the upper rail 251 by a pin 294a having a retaining portion so as to be rotatable. The first gear 294 meshes with the first gear teeth 252a. Further, second gear teeth 291d are formed in the longitudinal direction at the front end edge of the end portion of the rear link bar 291c, and mesh with the second gear 295. By the meshing of these two places, the translational movement in the longitudinal direction of the rear link bar 291c is locked, and the height position of the bent portion 291a is fixed.

  When the upper rail 251 is slid forward on the lower rail 252, the first gear 294 is attached to the under frame 260 fixed to the upper rail 251 so as to be axially rotatable. The first gear 294 meshed with 252a rotates forward. At this time, the second gear 295 rotates forward together with the first gear 294. The rotation of the second gear 295 causes the second gear teeth 291d engaged with the second gear 295 to translate forward and upward along the longitudinal direction. That is, the rear link bar 291c is drawn forward and upward from the meshing portion of the second gear 295 and the second gear teeth 291d, and the bent portion 291a moves upward in the front side.

  At this time, as in the second embodiment, the bent portion 291a of the bent lifter link 291 moves on an arc, so that the rear link bar 291c bends according to the length of the extended rear link bar 291c. It rotates in a plane including the lifter link 291. The second gear teeth 291d are supported by the holder 296 from the opposite side of the meshing portion in order to maintain meshing with the second gear 295. In order to realize such rotation of the rear link bar, The holder 296 also needs to rotate with it.

  As shown in FIG. 5A, the first gear 294 is provided with a substantially arc-shaped holder installation hole 297, and the holder 296 is inserted into the holder installation hole 297 in the underframe 260. It is attached. As shown in the AA cross-sectional view of FIG. 5B, the holder 296 includes three parts, a front side part 296a, a center part 296b, and a back side part 296c in the thickness direction. The radial width of the first gear 294 of the central portion 296b, that is, the width in the AA direction is narrower than the width of the front side portion 296a and the back side portion 296c. The holder installation hole 297 also includes three parts having different widths in the AA direction, and has substantially the same width as the three parts 296a, 296b, and 296c of the holder 296 in the AA direction. With these configurations, the holder 296 can be rotated in the substantially arc-shaped holder installation hole 297 while being retained with respect to the holder installation hole 297, so that the end of the rear link bar 291c can be rotated. When the portion rotates about the axes of the first gear 294 and the second gear 295, the second gear teeth 291d can be held in mesh with the second gear 295 by moving following the rotational movement. it can. According to such a configuration, when the rear link bar 291c is extended, the rear link bar 291c moves the bent portion 291a on the arc while maintaining the engagement between the second gear teeth 291d and the second gear 295. Can be rotated forward by an angle necessary to keep the

  When the rear end of the rear link bar 291c is translated and rotated in this way, the length of the front link bar 291b from the bent portion 291a to the position of the guide member 293 is shortened accordingly. 291b slides in the guide member 293. At the same time, the front link bar 291b is rotated forward about the guide member 293. In this way, by sliding the upper rail 251 forward with respect to the lower rail 252, the bent portion 291a of the bent lifter link 291 moves upward. On the other hand, by sliding the upper rail 251 backward, the bent portion 291a of the bent lifter link 291 moves downward.

  The front height adjusting means 280 has the same structure as the rear height adjusting means 290. The first gear teeth 252a formed on the lower rail 252 are shared with the rear height adjusting means 290 and meshed with the first gear. When the upper rail 251 is slid to the front side with respect to the lower rail 252, the first gear of the front height adjusting means 280 and the first gear of the rear height adjusting means 290 rotate synchronously, so that the front height adjustment The bent portion of the means 280 and the bent portion of the rear height adjusting means 290 move upward by the same distance. Similarly, when the upper rail 251 is slid rearward with respect to the lower rail 252, the two bent portions move downward by the same distance.

  Since the first gears of the left and right front height adjusting means 280 and the rear height adjusting means 290 are engaged with the first gear teeth 252a, the sliding of the upper rail 251 in the slide means 250 causes the left and right front sides. The rotations of the first gears of the height adjusting means 280 and the rear height adjusting means 290 are synchronized. Further, since the first gear teeth 252 formed on the left and right lower rails 252 have the same number of teeth, the first gears of the pair of front height adjusting means 280 are rotated by the sliding of the upper rail 251 in the sliding means 250. Synchronized with each other, the rotations of the first gears of the pair of rear height adjusting means 290 are synchronized with each other. That is, the rotations of the first gears of all four height adjusting means are synchronized by the sliding of the upper rail 251 in the sliding means 250, and the bent portions of the four bent lifter links simultaneously move up and down by the same distance, Is raised and lowered with respect to the floor surface.

  In the lifter mechanism 270, since all the four height adjusting means have the lock mechanism as described above, the load applied to the seat cushion can be supported with high stability. Further, the vertical movements of the bent portions in all four height adjusting means are synchronized. In addition, this synchronization is achieved only by sliding the upper rail 251 with respect to the lower rail 252, and it is not necessary to separately provide a connecting member for connecting the height adjusting means to each other, and a height adjusting device such as a lever or a motor is not required. . In other words, the sliding operation of the upper rail 251 on the lower rail 252 including the first gear teeth 252a functions as a first transmission mechanism and a second transmission mechanism. In these respects, the lifter mechanism 270 according to the present embodiment is superior to the lifter mechanisms in the first embodiment and the second embodiment.

  According to the configuration of the lifter mechanism 270 according to the present embodiment, when the seat is moved up and down, the seat is inevitably accompanied by the back-and-forth motion. However, when such a seat with a lifter mechanism is installed in the driver's seat, the short height driver needs to move the seat upward and forward, and the tall driver needs to move under the seat. Since it is usually necessary to move to the rear and rearward, it is not a problem that the seat moves up and down with a back-and-forth motion.

  In the third embodiment, all four height adjusting means have the same configuration, but the first gear teeth of the pair of front height adjusting means 280 and rear height adjusting means 290 are the same. By making the reduction gear ratio of the second gear teeth different from each other, the distance of the vertical movement of the bent portion of the front height adjusting means 280 and the distance of the vertical movement of the bent portion of the rear height adjusting means 290 are different. Can be made. For example, if the reduction ratio of the second gear teeth to the first gear teeth of the front height adjusting means is made smaller than that of the rear height adjusting means, when the upper rail 251 is slid forward, The bent portion of the front height adjusting means 280 moves upward by a longer distance than the bent portion of the rear height adjusting means 290. That is, the front of the seat is lifted compared to the rear. In general, such a configuration is preferable for a short stature driver because it is easier to perform a driving operation when the front of the seat is lifted.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention. For example, the pair of front height adjustment means and the pair of rear height adjustment means do not need to be the same, and the pair of front height adjustment means are the same as those in the first embodiment, A configuration in which the side height adjusting means is the same as in the second embodiment can be exemplified.

2 Seat cushion 4 Lower arm 5 Slide means 51 Upper rail 52 Lower rail 6 Under frame 7 Lifter mechanism 8 Front side height adjusting means 9 Rear side height adjusting means 9a Lifter link 9b Pinion gear 9c Sector gear 91 Shaft connecting member 140 Lower arm 160 Under frame 170 Lifter mechanism 180 Front height adjusting means 190 Rear height adjusting means 191 Bending lifter link 191a Bending portion 191b Front link bar 191c Rear link bar 191d Rack gear 192 Pinion gear 240 Lower arm 250 Slide means 251 Upper rail 252 Lower rail 252a First gear Teeth 260 Underframe 270 Lifter mechanism 280 Front height adjusting means 290 Rear height adjusting means 291 Bent lifter link 291a Bending portion 291b Front link bar 291c rear link bar 291d second gear teeth 293 guide member 294 first gear 295 second gear 296 holder

Claims (2)

In a vehicle seat in which a seat cushion is supported by an underframe that supports the seat cushion so as to be movable up and down via a lifter mechanism,
The lifter mechanism is provided with front height adjusting means for adjusting the height position of the front part of the pair of left and right seat cushions, and further rearward of the pair of left and right seat cushions behind the front height adjusting means. A rear height adjusting means for adjusting the height position of the
Each of the front height adjusting means and the rear height adjusting means includes a lifter link member having an upper end portion attached to the seat cushion and a lower end portion attached to the under frame. Includes gear teeth that mesh with a gear attached to the underframe or the seat cushion so as to be axially rotatable,
The two gears of the front height adjusting means are synchronously rotated with each other by a first transmission mechanism, and the rotation of both gears of the rear height adjusting means is synchronously rotated with each other by a second transmission mechanism. A vehicle seat with a lifter mechanism. The vehicle seat further includes a pair of left and right slide means each having a lower rail fixed to the floor surface and an upper rail engaged with the lower rail so as to be slidable in the front-rear direction. The underframe is fixed, an upward first gear tooth is formed on the outer surface of the lower rail, and a first gear and a second gear, which are coaxially fixed integrally with the underframe, are axially rotatable. Attached, the first gear meshes with the first gear teeth;
In the lifter link member, a bent portion provided at a midway portion is connected to a seat cushion, and second gear teeth are integrally formed on the front surface of the end portion of the rear link bar extending rearward and downward from the bent portion. The end portion of the front link bar that meshes with the second gear and extends forward and downward from the bent portion is slidable in the longitudinal direction via the guide member and is rotatable in a plane including the lifter link member Attached to the upper rail,
When the left and right upper rails move in the front-rear direction with respect to the lower rail, the first gears of the pair of front height adjusting means and the first gears of the pair of rear height adjusting means are synchronized with each other on the left and right. The vehicle seat with a lifter mechanism according to claim 1, wherein the vehicle seat is configured to be rotated.

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