JP2009023580A - Height adjustment device of seat and suspension unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height adjustment device of a seat allowing movement only in the vertical direction of an upper part frame and increasing rigidity of an attaching part of a link and the upper part frame or a lower part frame. <P>SOLUTION: This height adjustment device of the seat is devised to adjust the height of the upper part frame 4 by providing a driving source 38 to adjust the height of the upper part frame 4 attached to the lower part frame 2 through a link mechanism 6 free to vertically move and height adjusting levers 54, 56 driven by this driving source 38 and adding driving force of the driving source 38 to the link mechanism 6 by engaging a part of the height adjusting levers 54, 56 with the link mechanism 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat height adjusting device that adjusts the height of a seating surface according to a seated person's seating height and preference in a seat such as a vehicle seat, and a suspension unit including the height adjusting device.

  Many conventional vehicle seats connect an upper frame to which a seat is attached to a lower frame via a parallel link.

  In addition, the rear part of the upper frame is connected to a rotating shaft attached to the lower frame via a link mechanism, and a rotary damper is attached to the rotating shaft, and the upper frame is attached upward between the link mechanism and the lower frame. There has been proposed a structure in which a spring is provided and the seat height adjusting device has a suspension function (see, for example, Patent Document 1).

  Further, in the configuration in which the seat height is adjusted by rotating the pinion gear by operating the operation knob and having the pinion gear and the sector gear meshing with each other, the support shaft of each gear is cantilevered by the seat side frame. Also, there is a possibility that the pitch between the gears may not be stable due to the tilt of the sector gear, so there is also proposed that both the pinion gear and the sector gear support shaft are held by both the seat side frame and the gear cover. (For example, refer to Patent Document 2).

JP-A-9-150653 JP 2006-182039 A

  However, both of the seat height adjusting devices described in Patent Documents 1 and 2 are based on parallel links, and have a structure that involves a diagonally upward movement when the upper frame moves from the lowermost end to the uppermost end. . In addition, the larger the vertical stroke of the upper frame, the greater the amount of movement in the front-rear direction.In order to ensure a predetermined rigidity at the uppermost end, for example, it is necessary to increase the rigidity by increasing the plate thickness of the link, There was a problem that the overall weight of the apparatus was increased.

  The present invention has been made in view of such problems of the prior art, and allows the upper frame to move only in the vertical direction (vertical direction), and the rigidity of the link and the mounting portion of the upper frame or the lower frame. An object of the present invention is to provide a seat height adjusting device having an increased number of sheets.

  In order to achieve the above object, the invention according to claim 1 of the present invention includes a lower frame, an upper frame attached to the lower frame via a link mechanism so as to be movable up and down, and a seat placed thereon. A height adjusting device for adjusting the height of the seat, further comprising: a driving source for adjusting the height of the upper frame; and a height adjusting lever driven by the driving source. The height adjustment lever is partly engaged with the link mechanism, and the driving force of the drive source is applied to the link mechanism to adjust the height of the upper frame. .

  According to a second aspect of the present invention, the link mechanism includes a pair of X-links, each of the pair of X-links includes a first link and a second link, and one end of the first link is The other end of the first link is slidably attached to the upper frame while being pivotally attached to the lower frame, and one end of the second link is pivotally attached to the upper frame and the other end of the second link is attached to the upper frame. A height adjustment member attached to the lower frame is slidably attached to the lower frame, and is slidably inserted into a long hole formed in the first link.

  Further, in the invention according to claim 3, a height adjustment shaft is rotatably attached to the lower frame, and one end of the height adjustment lever is fixed to the height adjustment shaft, and the height adjustment member is attached to the lower frame. The height adjustment lever is pivotally attached to the other end of the height adjustment lever, and the height adjustment lever is swung by rotating the height adjustment shaft by the drive source to adjust the height of the upper frame. It is characterized by that.

  According to a fourth aspect of the present invention, one end of a height adjustment shaft drive lever is fixed to the height adjustment shaft, and the other end of the height adjustment shaft drive lever is screwed together via a male screw and a female screw. It is connected to the drive source.

  The invention according to claim 5 is a suspension unit including the seat height adjusting device according to any one of claims 1 to 3, wherein a pair of heights are provided at both ends of the height adjusting shaft. One end of the height adjusting lever is fixed, the other end of the pair of height adjusting levers is connected by a connecting shaft, and a cylindrical second height adjusting shaft is provided on the height adjusting shaft. One end of the height adjustment shaft drive lever is fixed to the second height adjustment shaft, the other end of the height adjustment shaft drive lever is connected to the drive source, and the height adjustment shaft drive lever and the connection shaft are connected. And are connected via an elastic body.

  The invention according to claim 6 is characterized in that the elastic body is a coil spring having one end locked to the height adjusting shaft driving lever and the other end locked to the connecting shaft. .

  According to the present invention, a drive source for adjusting the height of the upper frame and a height adjustment lever driven by the drive source are provided, and a part of the height adjustment lever is engaged with the link mechanism. Since the height of the upper frame is adjusted by applying the driving force of the drive source to the link mechanism, the movement of the link mechanism is restricted by the height adjustment lever, and the rigidity of the entire link mechanism increases. To do.

  Further, since the link mechanism is constituted by a pair of X-links, there is no movement in the front-rear direction accompanying the vertical movement of the upper frame.

  Furthermore, when an elastic member is attached to the height adjusting shaft, a suspension unit having a simple configuration can be realized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a seat height adjusting device M according to the present invention. For example, the seat height adjusting device M is attached to a vehicle seat, and adjusts the seat frame height by adjusting the height of the upper frame. Used for.

  As shown in FIGS. 1 to 4, a seat height adjusting device M according to the present invention is, for example, a substantially rectangular lower frame 2 attached to a vehicle body floor, and a seat attached to the lower frame 2 so as to be movable up and down. Is provided with a substantially rectangular upper frame 4 and a pair of left and right link mechanisms 6 that connect the lower frame 2 and the upper frame 4.

  The lower frame 2 includes a pair of left and right side frames 8 extending in the front-rear direction, a front frame 10 having both ends connected to the front ends of the pair of side frames 8, and both ends at the rear ends of the pair of side frames 8. The rear frame 12 is connected. Each of the side frames 8 has a substantially U-shaped cross section, and the opening thereof opens toward the inside, whereas the front and rear frames 10 and 12 are formed in a cylindrical shape.

  Similarly to the lower frame 2, the upper frame 4 also includes a pair of left and right side frames 14 extending in the front-rear direction, a front frame 16 having both ends connected to the front ends of the pair of side frames 14, and a rear of the pair of side frames 14. The rear frame 18 has both ends connected to the end. Each of the side frames 14 has a substantially U-shaped cross section, and the opening thereof opens toward the inside, whereas the front and rear frames 16 and 18 are formed in a cylindrical shape.

  Each of the pair of left and right link mechanisms 6 includes an X-link in which two links 20 and 22 are pivotally attached at an intermediate portion, and the front end portion of the link 20 is connected to the front end portion of the side frame 8 of the lower frame 2. It is pivotally attached to a fixed block 24 that is fixed. On the other hand, the rear end portions of the left and right links 20 are connected by a connecting shaft 25, and cylindrical rolling elements 26 are attached to both ends of the connecting shaft 25 so as to be freely rollable. The rolling element 26 is accommodated in the side frame 14 of the upper frame 4, and the rolling element 26 rolls, so that the rear end portion of the link 20 slides in the side frame 14 in the front-rear direction. Similarly, the front end portion of the link 22 is pivotally attached to a fixed block 28 fixed to the front end portion of the side frame 14 of the upper frame 4. On the other hand, the rear end portions of the left and right links 22 are connected by a connecting shaft 29, and cylindrical rolling elements 30 are attached to both ends of the connecting shaft 29 so as to roll freely. The rolling element 30 is accommodated inside the side frame 8 of the lower frame 2, and the rolling element 30 rolls so that the rear end portion of the link 22 slides in the side frame 8 in the front-rear direction.

  Further, a U-shaped bracket 32 is fixed to the rear portion of the front frame 10 of the lower frame 2, and two arms formed integrally with the speed reduction unit mounting housing 34 at the rear end portion of the bracket 32. The front end of 34a is pivotally attached. A speed reduction unit 36 is attached to the speed reduction unit mounting housing 34, and the speed reduction unit 36 is connected to a drive shaft (not shown) of a drive motor 38 attached to the speed reduction unit mounting housing 34.

  In addition, both ends of two cross members 42 (front cross members not shown) spaced in the front-rear direction are joined to the bottom surfaces of the pair of left and right side frames 8 constituting the lower frame 2. The two cross members 42 are attached to both end portions (front end portion and rear end portion) of two height adjusting shaft mounting members 44 and 46 that are separated in the left-right direction.

  Each of the height adjusting shaft mounting members 44 and 46 is curved in a convex shape toward the upper side, and semicircular concave portions 44a and 46a (see FIG. 7) are formed on the upper surface thereof, and these two concave portions 44a and 44a, Both ends of the height adjusting shaft 48 are placed on 46a. Height adjusting shaft holding members 50 and 52 having semi-circular recesses 50a and 52a formed on the lower surface are attached to the height adjusting shaft mounting members 44 and 46, respectively. By being loosely inserted between the height adjusting shaft mounting members 44 and 46 and the height adjusting shaft holding members 50 and 52, the structure is rotatable.

  Also, one end of the height adjustment levers 54 and 56 is fixed to both ends of the height adjustment shaft 48 positioned outside the height adjustment shaft attachment members 44 and 46, and the two height adjustment levers 54 and 56 are connected to each other. A substantially rectangular parallelepiped height adjustment member 60 is rotatably attached to the other end (free end), and the height adjustment member 60 is formed in the vicinity of the rear end portion of the link 20 which is one of the X-links. The long hole 20a is slidably inserted.

  Further, one end of a pair of nut mounting levers (height adjusting shaft driving levers) 62 extending in parallel is fixed to the height adjusting shaft 48 in the vicinity of the height adjusting lever 56, and connected to the other end of the nut mounting lever 62. Both ends of the shaft 64 are rotatably attached, and a female screw (not shown) is formed on the connecting shaft 64.

  The female screw of the connecting shaft 64 is screwed with a male screw formed at the rear end portion of the operating shaft 66, and the front end portion of the operating shaft 66 is connected to the speed reduction unit 36.

The operation of the height adjusting device M according to the present invention having the above-described configuration will be described below.
1 and 3 show the case where the upper frame 4 is at the lowermost position, while FIGS. 2 and 4 show the case where the upper frame 4 is at the uppermost position. Depending on the physique (especially sitting height) of the person sitting on the seat placed on the upper frame 4, the position between the lowermost position shown in FIGS. 1 and 3 and the uppermost position shown in FIGS. To adjust its height.

  When the upper frame 4 is raised from the lowermost position, or when raised from an intermediate position between the lowermost position and the uppermost position, for example, when an operation switch (not shown) attached to the seat and operating the drive motor 38 is pressed. The drive motor 38 rotates in the first direction, and the operating shaft 66 rotates in the direction of arrow A in FIG. A male screw is formed at the rear end portion of the operation shaft 66, and this male screw is screwed with a female screw formed on the connection shaft 64, so that the connection is made in accordance with the rotation of the operation shaft 66 in the direction of arrow A. The shaft 64 moves backward.

  When the connecting shaft 64 moves rearward, the height adjusting shaft 48 rotates in the direction of arrow B via the nut mounting lever 62, and the height adjusting levers 54 and 56 fixed to both ends of the height adjusting shaft 48 are the same. Swing in the direction. A height adjustment member 60 is rotatably attached to the free ends of the height adjustment levers 54 and 56, and the height adjustment member 60 is slidable in the long hole 20a of the link 20 constituting the X-link. Therefore, when the height adjusting member 60 rises as the height adjusting levers 54 and 56 swing in the direction of arrow B, the rear side of the link 20 rises and the upper frame 4 also rises. .

  Note that as the rear side of the link 20 rises, the rolling elements 26 attached to both ends of the connecting shaft 25 that connects the rear ends of the left and right links 20 move forward in the side frame 14 of the upper frame 4. The rolling elements 30 attached to both ends of the connecting shaft 29 that connects the rear ends of the left and right links 22 roll forward in the side frame 8 of the lower frame 2 while rolling.

  When the hand is released from the operation switch when the seat surface of the seat reaches a desired height, the upper frame 4 is held at that position (height), and the seat height adjustment is completed.

  Conversely, when lowering the upper frame 4 from the uppermost position, or when lowering it from an intermediate position between the lowermost position and the uppermost position, when another operation switch (not shown) is pressed, the drive motor 38 is described above. It rotates in the direction opposite to the first direction, the operating shaft 66 rotates in the direction opposite to the arrow A via the speed reduction unit 36, and the connecting shaft 64 moves forward.

  When the connecting shaft 64 moves forward, the height adjusting shaft 48 rotates in the direction opposite to the arrow B via the nut mounting lever 62, and the height adjusting levers 54 and 56 swing in the same direction. As a result, the height adjusting member 60 is lowered, the rear side of the link 20 is lowered, and the upper frame 4 is also lowered.

  When the hand is released from the operation switch when the seat surface of the seat reaches a desired height, the upper frame 4 is held at that position (height), and the seat height adjustment is completed.

  The suspension unit can also be configured by providing elastic means in the height adjusting device M according to the present invention having the above-described configuration.

  5 and 6 show a suspension unit S provided with a height adjusting device M according to the present invention, in which a cylindrical second height adjusting shaft 68 is mounted on the height adjusting shaft 48, and the second A coil spring 70 as an elastic body is further provided on the height adjusting shaft 68. That is, a predetermined clearance is provided between the outer peripheral surface of the height adjustment shaft 48 and the inner peripheral surface of the second height adjustment shaft 68, and the outer peripheral surface of the second height adjustment shaft 68 and the coil A predetermined clearance is also provided between the inner surface of the spring 70. One end of the coil spring 70 is locked to one of the pair of nut mounting levers 62, and the other end of the coil spring 70 is a connecting shaft 72 having both ends attached to the free ends of the pair of height adjustment levers 54, 56. The lifting force of the upper frame 4 is generated by the elastic force of the coil spring 70.

  FIG. 7 particularly shows the second height adjustment shaft 68 and the coil spring 70. In the suspension unit S, one end of the pair of nut mounting levers 62 is inserted into the second height adjustment shaft 48. The height adjustment shaft 68 is fixed. Also, the height adjustment shaft mounting members 44 and 46 and the height adjustment shaft holding members 50 and 52 are slightly larger than the radius of the second height adjustment shaft 68 inside the semicircular recesses 44a, 46a, 50a and 52a. Radial semicircular recesses 44b, 46b, 50b, 52b are formed adjacent to each other, and both ends of the second height adjusting shaft 68 are loosely inserted into these recesses 44b, 46b, 50b, 52b.

  Therefore, when adjusting the height of the upper frame 4, the driving force of the drive motor 38 is transmitted to the coil spring 70 via the nut mounting lever 62 and further to the upper frame 4 via the height adjusting levers 54 and 56. Communicated.

  The suspension unit S configured as described above elastically supports the weight of the upper frame 4 and seat and the weight of the seated person by the coil spring 70, and acts to relieve vibrations and the like input from the outside by the elastic force of the coil spring 70.

  The seat height adjusting device according to the present invention is useful as, for example, a vehicle seat because the rigidity of the entire link mechanism is increased and the upper frame does not move back and forth even if it moves up and down.

It is a perspective view of the height adjustment device concerning the present invention, and shows a case where an upper frame is in the lowest end position especially. FIG. 2 is a perspective view of the height adjusting device of FIG. 1, particularly showing a case where the upper frame is at the uppermost position. It is a disassembled perspective view of the height adjustment apparatus shown by FIG. It is a disassembled perspective view of the height adjustment apparatus shown by FIG. It is a disassembled perspective view of the suspension unit provided with the height adjustment apparatus of FIG. FIG. 6 is another exploded perspective view of the suspension unit of FIG. 5. It is sectional drawing which shows the elastic body holding member and elastic body which were provided in the suspension unit of FIG.

Explanation of symbols

2 Lower frame, 4 Upper frame, 6 Link mechanism, 8 Side frame,
10 front frame, 12 rear frame, 14 side frame,
16 front frame, 18 rear frame, 20, 22 link, 20a slot,
24 fixed blocks, 25 connecting shafts, 26 rolling elements, 28 fixed blocks,
29 connecting shafts, 30 rolling elements, 32 U-shaped brackets,
34 deceleration unit mounting housing, 34a arm, 36 deceleration unit,
38 drive motor, 40, 42 cross member, 44, 46 height adjustment shaft mounting member,
48 height adjustment shaft, 50, 52 height adjustment shaft holding member,
54, 56 Height adjustment lever, 60 Height adjustment member, 62 Nut mounting lever,
64 connecting shafts, 66 operating shafts, 68 second height adjusting shafts,
70 coil spring, 72 connecting shaft, M height adjustment device,
S Suspension unit.

Claims (6)

A height adjustment device for adjusting the height of the seat, comprising a lower frame and an upper frame mounted on the lower frame via a link mechanism so as to be movable up and down;
A drive source for adjusting the height of the upper frame and a height adjustment lever driven by the drive source are further included, and the drive is performed by engaging a part of the height adjustment lever with the link mechanism. A seat height adjusting device characterized in that a height of the upper frame is adjusted by applying a driving force of a source to the link mechanism.   The link mechanism is composed of a pair of X-links, each of the pair of X-links has a first and a second link, and one end of the first link is pivotally attached to the lower frame and the first The other end of the link is slidably attached to the upper frame, one end of the second link is pivotally attached to the upper frame, and the other end of the second link is slidably attached to the lower frame. 2. The seat height adjusting device according to claim 1, wherein a height adjusting member attached to the height adjusting lever is slidably inserted into a long hole formed in the first link.   A height adjustment shaft is rotatably attached to the lower frame, and one end of the height adjustment lever is fixed to the height adjustment shaft, and the height adjustment member is rotated to the other end of the height adjustment lever. 3. The height of the upper frame is adjusted by swinging the height adjusting lever by freely mounting and rotating the height adjusting shaft by the driving source. Seat height adjustment device.   One end of a height adjustment shaft drive lever is fixed to the height adjustment shaft, and the other end of the height adjustment shaft drive lever is connected to the drive source via a male screw and a female screw that are screwed together. The seat height adjusting device according to claim 3. A suspension unit comprising the seat height adjusting device according to any one of claims 1 to 3,
One end of a pair of height adjustment levers is fixed to both ends of the height adjustment shaft, the other end of the pair of height adjustment levers is connected by a connection shaft, and a cylindrical shape sheathed on the height adjustment shaft Providing a second height adjustment shaft, fixing one end of the height adjustment shaft drive lever to the second height adjustment shaft, and connecting the other end of the height adjustment shaft drive lever to the drive source; The suspension unit characterized in that the height adjusting shaft driving lever and the connecting shaft are connected via an elastic body.   The suspension unit according to claim 5, wherein the elastic body is a coil spring having one end locked to the height adjusting shaft driving lever and the other end locked to the connecting shaft.

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