JP2012158284A - Buffer and vehicle with the buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer capable of suitably reducing and suppressing impact propagated from a vehicle body to its seats by being interposed between them.SOLUTION: The buffer includes an upper frame 2 and a lower frame 3, which are connected to each other with an expansion and contraction link mechanism 4 so as to be relatively movable up and downward, and a spring member 5 is interposed between both the frames 2, 3. The upper frame 2 and the lower frame 3 are interconnected with a freely bending and stretching link 6 therebetween. The bending and stretching link 6 is formed so as to have a link 61 whose one end is rotatably connected to the upper frame 2 and a link 62 whose one end is rotatably connected to the upper frame 3. The lower frame 3 and the bending and stretching link 6 are connected via a shock absorber 7 which bends or stretches simultaneously with bending and stretching work of the bending and stretching link 6. The shock absorber 7 is that its one end is rotatably connected as a fixing part 73 to the lower frame 3, and the other end is rotatably connected to a coupling part 63 of links 61, 62.

Description

  The present invention relates to a shock absorber, and more particularly, to a shock absorber and a vehicle including the shock absorber that can support a seat in a passenger compartment and prevent an impact caused by traveling vibration or the like from propagating to a passenger.

  2. Description of the Related Art Conventionally, as a shock absorber for mitigating an impact propagating to a vehicle seat, a structure in which a pair of upper and lower frames are connected by a telescopic link mechanism and a shock absorber is installed between the two frames is known ( For example, Patent Document 1).

Japanese Patent Laid-Open No. 8-11607

  However, the conventional seat cushioning device (seat suspension device) disclosed in Patent Document 1 and the like has a structure in which both ends of the shock absorber are directly connected to a pair of upper and lower frames. For example, such a device is equipped. When the vehicle is traveling on a rough road, if a vibration with a large amplitude is temporarily applied to the vehicle body, the resulting impact acts at a high speed in the axial direction of the shock absorber, and the working fluid pressure is applied to the piston head of the shock absorber. As a result of abrupt action, the shock absorber will stiffen and its buffer function will be impaired.

  In other words, the shock absorber becomes a non-stretchable rigid body, which causes a problem that the shock caused by vibration applied to the vehicle body is not alleviated and propagates to the seat via the shock absorber.

  Also, when a large-amplitude vibration is applied, such as when a vehicle running at low speed climbs up a step, the upper frame with the seat is rapidly lowered and collides with the lower frame while the shock absorber shrinks. In some cases, the shock was transmitted directly to the seat.

  The present invention has been made in view of the circumstances as described above, and an object thereof is to provide a shock absorber capable of suitably mitigating and suppressing an impact propagating to the seat by being interposed between the vehicle body and the seat. There is to do.

In order to achieve the above object, the present invention
In a shock absorber having an upper frame and a lower frame that are connected to each other so as to be relatively movable in an up-down direction via an expansion / contraction link mechanism, and a spring member that elastically supports the upper frame interposed between the two frames.
Intervening between the upper frame and the lower frame, and having a bending and stretching link that bends and stretches when the both frames are moved relative to each other in the vertical direction;
The bending link is formed by connecting a first link having one end rotatably connected to the upper frame and a second link having one end rotatably connected to the lower frame,
One of the upper frame and the lower frame and the bending / extending link are connected by a shock absorber that expands and contracts in conjunction with the bending / extending operation of the bending / extending link,
One end of the shock absorber is rotatably connected to one of the upper frame and the lower frame as an attachment portion, and the other end is rotatable to the connecting portion of the first and second links. And is expanded and contracted while swinging up and down around the mounting portion when the bending and stretching link is bent and stretched.

Further, the present invention is a vehicle in which the shock absorber configured as described above is provided as a seat cushion in the lower part of the seat,
A vehicle with a shock absorber is provided, wherein the lower frame is fixed to a vehicle body located below the seat, and the seat is fixed to the upper frame.

  According to the shock absorber according to the present invention, the upper frame and the lower frame are connected by the bending / extending link formed by connecting the first link and the second link, and either one of the first frame and the second link is connected. Therefore, the shock propagating from the lower frame to the upper frame can be satisfactorily mitigated by the shock absorber that expands and contracts in conjunction with the bending and stretching operation of the bending and stretching link.

  Moreover, according to the vehicle which provided the buffering device as a seat cushion between the vehicle body and the lower part of the seat, it is possible to suppress the impact caused by the traveling vibration from propagating to the seat.

The top view which shows the shock absorber which concerns on this invention XX sectional view of FIG. Plan view of lower frame Operation explanatory diagram of the shock absorber according to the present invention Graph showing the relationship between the amount of expansion and contraction of the shock absorber and the amount of displacement of the upper frame

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a shock absorber according to the present invention, and FIG. 2 shows an XX cross section of FIG. 1 and 2, reference numeral 1 denotes a frame constituting such a shock absorber, and this frame 1 is composed of an upper frame 2 and a lower frame 3 as is apparent from FIG. FIG. 3 shows a plane of the lower frame 3 from which the upper frame 2 is omitted.

  As is clear from FIGS. 1 and 3, the upper frame 2 and the lower frame 3 are configured by installing fixed shafts 22 and 32 in rectangular frames 21 and 31. Of these, the frame body 21 constituting the upper frame 2 is composed of a pair of left and right sides erected between both ends of the front edge member 21a and the rear edge member 21b, and the front edge member 21a and the rear edge member 21b. It consists of edge members 21c and 21d, and both ends of the fixed shaft 22 orthogonal to this are supported by the side edge members 21c and 21d. The fixed shaft 22 is fixed to the frame body 21 in the vicinity of the front edge member 21a.

  In addition, brackets 23 are fixed to the side edge members 21c and 21d constituting the frame body 21 of the upper frame 2 so as to extend in the left-right direction at both ends of the side edge members 21c and 21d. Is configured to be fastened by bolts.

  On the other hand, as shown in FIG. 3, the frame 31 constituting the lower frame 3 is composed of a pair of left and right sides erected between both ends of the front edge member 31a and the rear edge member 31b and between the front edge member 31a and the rear edge member 31b. It consists of edge members 31c and 31d, and both ends of the fixed shaft 32 are supported by the side edge members 31c and 31d. The fixed shaft 32 is fixed to the frame body 31 in the vicinity of the front edge member 31a.

  In addition, brackets 33 projecting in the left-right direction at both ends of the side edge members 31c and 31d constituting the frame 31 of the lower frame 3 are fixed, and these brackets 33 are the vehicle body (the body floor under the seat). The lower frame 3 is fixed to the vehicle body by being fastened with bolts.

  Here, the upper frame 2 and the lower frame 3 configured as described above are connected via the telescopic link mechanism 4 so as to be relatively movable in the vertical direction. The telescopic link mechanism 4 is an elastic structure composed of two sets of cross links 41 arranged on the left and right sides inside the upper frame 2 and the lower frame 3, and the cross links 41 are a pair of links having the same length. The arms 41a and 41b are configured by pin joining the centers of the arms 41a and 41b. Among these, the link arms 41 a and 41 a facing each other are rotatably coupled at one end to the fixed shaft 22 of the upper frame 2 and connected at the other end by a movable shaft 43 parallel to the fixed shaft 22. ing. Each of the link arms 41b and 41b intersecting the link arms 41a and 41a is rotatably coupled at one end to the fixed shaft 32 of the lower frame 3 and the other end is parallel to the fixed shaft 32. 44.

  2, the front edge members 21a and 31a, the rear edge members 21b and 31b, and the side edge members 21c, 21d, 31c, and 31d constituting the frame bodies 21 and 31 have a U-shaped cross section. Of these, the inner side of the side edge members 21c, 21d, 31c, 31d is a guide groove G that supports both ends of the movable shafts 43, 44 so as to be movable. Rollers R that roll in the guide grooves G are attached to both ends of the movable shafts 43 and 44, respectively. Accordingly, the upper and lower frames 2 and 3 can be moved relative to each other in the vertical direction by the telescopic link mechanism 4 as described above (the upper frame 2 can be moved up and down with respect to the lower frame 3). .

  As shown in FIGS. 1 and 3, a spring member 5 that elastically supports the upper frame 2 is interposed between the upper frame 2 and the lower frame 3. This spring member 5 is an elastic body (in this example, an air spring) that functions to prevent the upper frame 2 from dropping naturally and to return the lowered upper frame 2 to the upper position upon receiving an impact load or the like. The lower end is supported by a seat plate 34 fixed to the lower frame 3, and the upper end is elastically in contact with the top plate 24 fixed to the upper frame 2.

  In addition, as is apparent from FIG. 2, the upper frame 2 and the lower frame 3 are connected via a bending / extension link 6, and the bending / extension link 6 and the lower frame 3 are connected by a shock absorber 7.

  The bending / extending link 6 has a configuration in which one ends of two links 61 and 62 are connected to each other by a pivot 63, and the other end of the link 61 is a part of the upper frame 2 (on the top plate 24). The other end of the link 62 is rotatably connected to a portion of the lower frame 3 (the tip of the bracket 35 fixed to the rear edge member 31b). The bending and stretching link 6 bends and stretches in conjunction with the lifting and lowering operation of the upper frame 2 with respect to the lower frame 3.

  On the other hand, the shock absorber 7 is a damper having a cylinder body 71 and a piston rod 72, and the cylinder body 71 is filled with oil as a working fluid. In this example, the shop absorber 7 has a clevis shape at both ends, and one end portion (bottom side) of the shop absorber 7 is rotatably attached to a portion of the lower frame 3 (the bracket 36 fixed to the fixed shaft 32) as a mounting portion 73. One end portion (the head side) is rotatably coupled to the connecting portion (the pivot 63) of the links 61 and 62.

  Here, the operation of the shock absorber configured as described above will be explained. For example, the shock absorber is provided as a seat cushion in the lower part of the vehicle seat, and the vehicle seat is attached to the upper frame 2 as described above. The lower frame 3 is fixed to the vehicle body. When a vehicle equipped with such a shock absorber travels on a rough road or rides on a step, the upper frame 2 receives the impact load at that time and uses the position shown in FIG. Vibrates vertically as shown in (a) and (c). At this time, the bending and stretching link 6 bends and stretches in accordance with the change in the distance between the upper frame 2 and the lower frame 3, and the shock absorber 7 swings up and down around the mounting portion 73 in conjunction with the bending and stretching operation. It expands and contracts. In particular, the stroke change amount of the shock absorber 7 (the change amount of the distance between the pivot 63 and the mounting portion 73) with respect to the displacement amount of the upper frame 2 per unit time due to the bending and stretching operation of the bending and stretching link 6 is as shown in FIG. Get smaller. In other words, the expansion / contraction speed of the shock absorber is slower than the moving speed of the upper frame 2. For this reason, even when an impact load is applied from the vehicle body to the lower frame 3 at a high speed, the shock absorber 7 expands and contracts without clumping, thereby reducing the impact transmitted to the upper frame 3.

  As mentioned above, although the embodiment of the shock absorber according to the present invention has been described, the shock absorber 7 is not limited to coupling one end portion (attachment portion 73) to the lower frame 3, but may be coupled to the upper frame 2. Good. Moreover, the one end part (attachment part 73) couple | bonded with the lower frame 3 or the upper frame 2 is not restricted to a bottom side, The head side may be sufficient.

  In addition, such a shock absorber can be provided as a seat cushion in the lower part of the seat of the vehicle, and can be interposed between various components to mitigate the impact transmitted to the upper frame 2.

2 Upper frame 3 Lower frame 4 Telescopic link mechanism 5 Spring member 6 Bend-extension link 61 First link 62 Second link 63 Axis (joint part of first and second links)
7 Shock absorber 73 Mounting part

Claims (2)

In a shock absorber having an upper frame and a lower frame that are connected to each other so as to be relatively movable in an up-down direction via an expansion / contraction link mechanism, and a spring member that elastically supports the upper frame interposed between the two frames.
Intervening between the upper frame and the lower frame, and having a bending and stretching link that bends and stretches when the both frames are moved relative to each other in the vertical direction;
The bending link is formed by connecting a first link having one end rotatably connected to the upper frame and a second link having one end rotatably connected to the lower frame,
One of the upper frame and the lower frame and the bending / extending link are connected by a shock absorber that expands and contracts in conjunction with the bending / extending operation of the bending / extending link,
One end of the shock absorber is rotatably connected to one of the upper frame and the lower frame as an attachment portion, and the other end is rotatable to the connecting portion of the first and second links. The shock absorber is characterized in that it is expanded and contracted while swinging up and down around the mounting portion when the bending and stretching link is bent and stretched. A vehicle provided with the shock absorber according to claim 1 as a seat cushion in a lower part of a seat,
A vehicle with a shock absorber, wherein the lower frame is fixed to a vehicle body located below the seat, and the seat is fixed to the upper frame.

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