JP2011098651A - Air suspension type seat support device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain excessive air consumption, and to improve durability in a valve, by restraining oversensitive operation of the valve, in an air suspension type seat support device for a vehicle. <P>SOLUTION: This constitution supplies and exhausts air to an air spring 30 by opening-closing the valve 80 by rocking the valve 80 by longitudinally moving the valve 80. A compression spring 121 is arranged for rocking the valve 80 when the valve 80 moves large, without rocking the valve 80 when the valve 80 moves small, and opening-closing of the vale in the small movement is restrained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle air suspension type seat support device that supports a seat provided in a vehicle using an air spring.

  Air brake devices are used as brake devices for large vehicles such as medium and large trucks and buses. The air suspension type seat support device uses air supplied to the air brake device as a cushion for seats such as driver seats. Is known (see Patent Documents 1 and 2, etc.).

  In a known air suspension type seat support device, an upper frame is supported to be movable up and down via a link mechanism above a lower frame fixed to a fixing member such as a chassis, and a seat cushion of a vehicle seat is fixed to the upper frame. There are many configurations. The link mechanism is generally equipped with a pair of left and right foldable X links in which two link bars are assembled in an X shape, and is seated on the seat between the lower frame and the upper frame. An air spring that receives a passenger's load via the upper frame is disposed. A valve that supplies air to the air spring or exhausts air from the air spring according to the vertical vibration input to the seat is provided. By the action of this valve, the seat height ( Vibration is absorbed while the seat cushion's seating surface (height) is kept constant, so that a comfortable ride is obtained.

Japanese Patent No. 2597171 JP-A-5-131869

  The conventional air suspension type seat support device uses the above-described valve and air suspension combination to automatically maintain a constant seat height using air pressure even when the weight of the occupant changes (constant seat height). And a function (seat height setting function) that can be set by changing the seat height according to the physique. However, when the vehicle is subject to vertical vibrations while traveling, air is constantly supplied and exhausted to and from the air spring. This is due to excessive air consumption and valves. This leads to problems such as a decrease in durability.

  Therefore, the present invention provides an air suspension type seat support device for a vehicle that can suppress the sensitive operation of the valve, thereby suppressing excessive air consumption and improving the durability of the valve. It is aimed.

  An air suspension seat support device for a vehicle according to the present invention includes a lower frame, an upper frame disposed above the lower frame and supporting a vehicle seat, and the upper frame can be moved up and down with respect to the lower frame. A link mechanism having a horizontal movement member that supports and moves in the horizontal direction as the upper frame moves up and down, is supplied with air from an air supply source, receives the load that the upper frame receives from above, and increases the height of the upper frame. An air suspension type seat support device for a vehicle, comprising: an air spring that adjusts the height; a damper that absorbs vibration of the air spring; and a seat height adjusting means that adjusts a height position of the upper frame. The height adjusting means supplies / discharges air to / from the air spring. A valve having a lube opening / closing portion, supported by a valve shaft extending in the vertical direction so as to be pivotable in the horizontal direction, and connected to the horizontal movement member of the link mechanism, and integrally with the horizontal movement member A slider that moves along the horizontal direction, a cam member that is disposed between the slider and the valve opening / closing portion of the valve, and a circular shape that rotates together with the valve and that depicts the rotation locus of the valve. A movable member provided so as to be movable along the radial direction, and one end of the movable member and the other end of the movable member being rotatably locked to the slider. A swivel unit that is bridged and can be swung according to the rotation of the valve, and the slider moves in the horizontal direction so that the cam member acts on the valve opening / closing unit of the valve according to the moving direction. When it is characterized in that it comprises a biasing means for biasing the movable member elastically in the direction of the slider which moves along with the turning of the pivot member in the radial direction.

  According to the present invention, it is possible to suppress the sensitive operation of the valve, thereby producing an effect of suppressing excessive air consumption and improving the durability of the valve.

It is a perspective view showing the whole sheet support device concerning one embodiment of the present invention. It is a top view of the apparatus. It is a side view of the same apparatus. It is a perspective view of the seat height adjustment means which the apparatus has. It is a perspective view which shows the state which removed the valve guide from FIG. It is a top view of a sheet height adjustment means. It is a partial side view of a seat height adjusting means. It is a top view which shows the valve | bulb of a seat height adjustment means, and its periphery. It is a top view which shows the valve | bulb opening / closing effect | action by a seat height adjustment means. It is a top view which shows the effect | action of the lock bar of a seat height adjustment means. It is a bottom view which shows the valve | bulb of seat height adjustment means, and its periphery. It is a figure which shows the effect | action of the compression spring provided in the valve | bulb, Comprising: It is a bottom view which shows the time of the small movement of a valve | bulb. It is a figure which shows the effect | action of a compression spring, Comprising: It is a bottom view which shows a time when a valve | bulb starts rotation for air supply. It is a figure which shows the effect | action of a compression spring, Comprising: It is a bottom view which shows the time when the supply stop of a valve | bulb is started.

  Hereinafter, an embodiment of a vehicle air suspension type seat support device (hereinafter referred to as a seat support device) according to the present invention will be described with reference to the drawings.

(1) Basic Configuration FIGS. 1 to 3 are views showing an entire seat support device according to an embodiment, and are a perspective view, a plan view, and a side view, respectively. In these drawings, reference numeral 10 denotes a lower frame composed of a rectangular frame. The lower frame 10 is incorporated in the vehicle, and a pair of left and right rail members 11 extending in the front-rear direction of the vehicle (in the drawing, arrow F indicates the front and R indicates the rear), and the front ends of the rail members 11, And a pair of front and rear lateral members 12 extending in the left-right direction connecting the rear ends. The lower frame 10 is fixed in a substantially horizontal state with respect to the vehicle chassis. In the following description, directions such as front and rear, left and right, and up and down are defined as directions when the seat support device is incorporated in a vehicle.

  An upper frame is supported above the lower frame 10 via a link mechanism 20, and seat cushions (not shown) of a vehicle seat are fixed to the upper frame. The link mechanism 20 includes a pair of left and right X links 24 in which two link bars 21 and 22 are assembled in an X shape via a link shaft 23. The link bars 21 and 22 are rotatable about the link shaft 23 as a fulcrum.

  As shown in FIGS. 1 and 3, the rear end (lower end) of each link bar 21 on the front rising side that inclines so as to extend upward toward the front of each X link 24 is the rear lower side extending in the left-right direction. A fixed shaft 25 is rotatably attached. The rear lower fixed shaft 25 is disposed in the vicinity of the lateral member 12 on the rear side of the lower frame 10, and both ends thereof are fixed to the left and right rail members 11, respectively. The rear end of each link bar 21 on the front rising side is connected via a rear lower fixed shaft 25. A front upper movable shaft 26 extending in the left-right direction is attached to the front end (upper end) of each link bar 21 on the front rising side, and the front end of each link bar 21 on the front rising side is the front upper movable shaft. It is in the state connected via 26.

  On the other hand, a rear upper movable shaft 27 extending in the left-right direction is attached to the rear end (upper end) of each link bar 22 on the front lowering side that inclines so as to extend downward toward the front of each X link 24. The rear ends of the link bars 22 on the front lowering side are connected via the upper movable shaft 27 thereafter. Further, the front end portion of each link bar 22 on the front lower side is rotatably attached to a front lower roller shaft (horizontal moving member) 28 extending in the left-right direction. The front lower roller shaft 28 is supported so as to be movable in the front-rear direction along the rail members 11 of the lower frame 10 via rollers 28a attached to both ends. When the front lower roller shaft 28 moves in the front-rear direction, the roller 28 a rolls on the rail member 11, whereby the front lower roller shaft 28 moves smoothly along the rail member 11. The front end of each link bar 22 on the front lower side is connected via a front lower roller shaft 28.

  The link mechanism 20 includes the pair of left and right X links 24, the rear lower fixed shaft 25, the front upper movable shaft 26, the rear upper movable shaft 27, and the front lower roller shaft 28. As shown in FIG. 1, in each X link 24, a link bar 21 on the front rising side is arranged inside a link bar 22 on the front lowering side. The link mechanism 20 uses the rear lower fixed shaft 25 as a fulcrum, the upper front upper movable shaft 26 and the rear upper movable shaft 27 move upward while approaching each other, and the X link 24 rises and extends. The front upper movable shaft 26 and the rear upper movable shaft 27 move downward while being separated from each other, so that the X link 24 is folded and contracted. When the X link 24 extends upward, the front lower roller shaft 28 moves rearward along the rail member 11 and approaches the rear lower fixed shaft 25, and when the X link 24 contracts. The rail member 11 is moved forward and separated from the rear lower fixed shaft 25.

  An air spring 30 is disposed in the space behind the link shaft 23 in the lower frame 10. The air spring 30 is supplied with compressed air from, for example, an air compressor (air supply source) constituting an air brake device of a vehicle. The air spring 30 expands upward when air is supplied, and contracts downward when exhausted. Above the air spring 30, a pressure receiving plate 31 fixed to the upper frame is installed. The pressure receiving plate 31 has left and right stay portions 31 a extending forward, and these stay portions 31 a are fixed to a sleeve 32 that is externally mounted on the link shaft 23. The sleeve 32 is rotatable relative to the link shaft 23, and the pressure receiving plate 31 is rotatably supported by the link shaft 23 via the sleeve 32.

  The upper frame is placed and supported on the pressure receiving plate 31 and the front upper movable shaft 26. Connected to the air spring 30 is a valve 80 (see FIG. 5, FIG. 7, etc.) for supplying air sent from the air supply source to the air spring 30 and discharging air in the air spring 30. . When the valve 80 is in an air supply state and air is supplied to the air spring 30, the pressure receiving plate 31 and the upper frame rise, the X link 24 extends upward, and the vehicle seat fixed to the upper frame A seat cushion (hereinafter simply referred to as a seat) is raised. Further, when the valve 80 is in an exhaust state, air is discharged from the air spring 30 due to the load of the occupant seated on the seat, whereby the pressure receiving plate 31 and the upper frame are lowered and the X link 24 is contracted downward. Then, the seat is lowered.

  As shown in FIGS. 1 and 3, an oil damper 33 is provided between the link 21 on the front rising side of the X link 24 on one side (the front side in FIG. 1) and the front lower roller shaft 28. . The oil damper 33 is rotatably attached to a pin 34 extending in the left-right direction with one end fixed to the front rising link 21 and to a bracket 35 attached to the front lower roller shaft 28 at the other end. Has been. The oil damper 33 absorbs vibration generated when the air spring 30 is actuated, and the expansion / contraction operation of the link mechanism 20 is buffered.

  The above is the basic configuration of the seat support apparatus according to the embodiment. In the space inside the lower frame 10 of the seat support device, a seat height adjusting means 40 that can adjust the seat height by adjusting the height position of the upper frame is provided. Hereinafter, the seat height adjusting means will be described.

(2) Seat Height Adjusting Unit As shown in FIG. 2, a frame plate 41 having a substantially T shape in plan view is disposed in the front part of the space in the lower frame 10. As shown in FIGS. 4 and 6, the frame plate 41 has a vertical plate portion 42 extending in the front-rear direction and a horizontal plate portion 43 extending in the left-right direction. The frame plate 41 is horizontally disposed below the front lower roller shaft 28, the front end of the vertical plate portion 42 is fixed to the front side horizontal member 12, and the front end of the horizontal plate portion 43 is fixed to the right rail member 11. It is fixed to.

  As shown in FIG. 2, a guide plate 50 extending in the front-rear direction and having a side plate portion 50a on the left side is fixed to the frame plate 41 slightly to the right of the intersection of the vertical plate portion 42 and the horizontal plate portion 43. Yes. On the left side of the guide plate 50, a slider guide 51 is fixed as shown in FIG. A valve guide 60 is fixed to the left side of the guide plate 50 on the frame plate 41 (lower side in FIG. 2). As shown in FIG. 4, the valve guide 60 includes a base 61 fixed to the frame plate 41 and a cover 62 fixed on the base 61.

  As shown in FIG. 4, the slider guide 51 is fixed to the right end portion of the base 61. Further, as shown in FIG. 6, a rack gear 70 extending in the front-rear direction is placed on the left end portion of the base 61. Is fixed. On the inner (right) side surface of the rack gear 70, gear teeth 70a arranged in the front-rear direction are formed. The surface heights of the slider guide 51 and the rack gear 70 are the same, and the cover 62 is placed and fixed on the slider guide 51 and the rack gear 70. Thus, an upper slit 63 corresponding to the height of the slider guide 51 and the rack gear 70 is formed between the base 61 and the cover 62. The upper slit 63 is open in the front-rear direction. A lower slit 64 is formed between the lower surface of the base 61 and the frame plate 41 by a recess formed in the lower surface of the base 61 extending in the front-rear direction. The lower slit 64 is also open in the front-rear direction.

  Guide holes 61b and 62b extending in the front-rear direction and penetrating in the up-down direction are formed in the middle portion in the left-right direction of the base 61 and the cover 62 of the valve guide 60, respectively. A guide hole 41b coinciding with 61b and 62b is formed. In the following description, these guide holes 61b, 62b, 41b may be collectively referred to as one guide hole 65.

  As shown in FIGS. 4 and 7, the valve 80 is disposed below the valve guide 60 with the frame plate 41 interposed therebetween. The valve 80 has a rectangular box-like appearance, and is fixed to a valve holder 85 as shown in FIG. The valve holder 85 is configured to sandwich the valve 80 in the vertical direction and the horizontal direction. A valve shaft 86 extending in the vertical direction and penetrating the guide hole 65 is provided at the right end of the valve holder 85. It has been. A rectangular plate-shaped horizontal slide plate 87 is engaged with the valve shaft 86. The valve shaft 86 passes through the center of the slide plate 87, and the slide plate 87 is accommodated in the lower slit 64 between the base 61 and the frame plate 41 so as to be movable in the front-rear direction.

  A disc gear 71 shown in FIGS. 4 and 6 is rotatably mounted on the valve shaft 86 above the slide plate 87. The disc gear 71 is accommodated in an upper slit 63 between the base 61 of the valve guide 60 and the cover 62. As shown in FIG. 6, the gear teeth 71 a on the outer peripheral surface of the disc gear 71 mesh with the gear teeth 70 a of the rack gear 70. A boss 71 b is formed at the center of the upper surface of the disc gear 71, and the boss 71 b is inserted into the guide hole 62 b of the cover 62.

  The valve 80 is supported so that it cannot drop off by engaging the slide plate 87 with the frame plate 41 and the disc gear 71 with the base 61 from above. The valve 80 is supported so as to be movable in the front-rear direction with respect to the valve guide 60 when the boss 71 b of the disc gear 71 moves along the guide hole 62 b of the cover 62. When the valve 80 moves in the front-rear direction, the disc gear 71 rolls while the gear teeth 71 a of the disc gear 71 are engaged with the gear teeth 70 a of the rack gear 70.

  The valve 80 incorporates a normally-closed air supply valve and an exhaust valve. As shown in FIG. 8, an air supply valve rod 81 that opens the air supply valve projects from the front side of the right side surface. On the rear side, an exhaust valve rod 82 that opens the exhaust valve protrudes. These valve rods 81 and 82 are always urged in a protruding direction, and the supply valve and the exhaust valve are opened by being pushed toward the valve 80 side. An air supply port 83 to which a pipe for introducing compressed air from the air supply source into the valve 80 is connected to the front side of the left side surface of the valve 80. A delivery port 84 to which a pipe for sending air is connected to the air spring 30 is provided. The supply valve rod 81 and the exhaust valve rod 82 constitute the valve opening / closing portion of the present invention.

  A cam (cam member) 90 shown in FIG. 8 is disposed on the valve shaft 86 below the slide plate 87. The cam 90 is slidable in the front-rear direction along the side plate portion 50 a of the guide plate 50. A boss 92 that bulges to the left is formed in an intermediate portion of the cam 90, and the valve shaft 86 is rotatably passed through the boss 92. That is, as shown in FIG. 9, the valve 80 is supported so as to be rotatable in the front-rear direction together with the valve holder 85 with the valve shaft 86 as a fulcrum. The cam 90 is sandwiched between the right side surface of the valve 80 from which the valve rods 81 and 82 protrude and the side plate portion 50a of the guide plate 50, and a boss 92 through which the valve shaft 86 passes is provided for the valve rods 81 and 82. It arrange | positions so that it may be located between.

  As shown in FIGS. 5 and 7, a bracket 100 extending to the front and rear of the valve 80 is fixed to the bottom of the valve 80. The rear end of the bracket 100 is locked with a wire 101 extending rearward as shown in FIGS. 3 and 7, and the valve 80 and the cam 90 are pulled by pulling the wire 101 rearward. It can be moved backwards. The wire 101 is provided around the seat, and is connected to an operation member such as a dial or a lever operated by an occupant.

  The valve 80 is urged forward by a coil spring 102 which is a tension spring shown in FIGS. One end of the coil spring 102 is engaged with the front end portion of the bracket 100, and the other end is engaged with a hook 42 b protruding downward from the front end portion of the vertical plate portion 42 of the frame plate 41.

  The valve 80 moves backward by operating the operation member against the urging force of the coil spring 102. When the operation member is operated in the release direction, the valve 80 is pulled forward by the coil spring 102 and moves forward. The operation member is provided with a stopper mechanism that stops at the position where the operation is stopped. When the operation of the operation member is stopped, the valve 80 stops moving in the front-rear direction by the stopper mechanism.

  As shown in FIG. 5, a front end portion of a lock bar 72 extending in the front-rear direction is fitted to the front lower roller shaft 28 so as to be rotatable. The lock bar 72 has a rear end portion inserted into the upper slit 63 of the valve guide 60 so as to be movable in the front-rear direction, and a rear end surface of the lock bar 72 is a rack shape that can mesh with the gear teeth 71 a of the disc gear 71. Gear teeth 72a are formed.

  The disk gear 71 is disposed behind the lock bar 72 with the rear end inserted into the upper slit 63. Normally, as shown in FIG. A predetermined gap is set between the plate gear 71 and the plate gear 71. When the front lower roller shaft 28 moves forward as the link mechanism 20 extends, the gear teeth 72a at the rear end of the lock bar 72 mesh with the disk gear 71, as shown in FIG. .

  When the gear teeth 72a of the lock bar 72 are engaged with the disc gear 71, the front lower roller shaft 28 is restricted from further advancement, the link mechanism 20 is prevented from extending upward, and the seat lifting operation is stopped. It is done. The suspension upper that locks the operation of the link mechanism 20 by restricting the movement of the front lower roller shaft 28 when it moves back a predetermined distance by the lock bar 72 and the disc gear 71 and moves a predetermined distance. A direction lock mechanism is configured.

  A hole 72b extending in the front-rear direction is formed on the right side of the rear end portion of the lock bar 72, and an upper portion formed in the front end portion of the slider 55 extending in the front-rear direction shown in FIGS. The convex part 56 which protrudes in this is fitted from the lower side. As shown in FIG. 5, the slider 55 has a block 57 at the rear end. The block 57 is slidable in the front-rear direction between the side plate portion 50 a of the guide plate 50 and the slider guide 51. It is sandwiched. As the link mechanism 20 expands and contracts, the front lower roller shaft 28 moves back and forth, and when the lock bar 72 moves in the front and rear direction, the block 57 of the slider 55 moves along with the side plate 50a of the guide plate 50. It is guided by the slider guide 51 and moves in the front-rear direction.

  The cam 90 is movable in the front-rear direction integrally with the valve 80 via the valve shaft 86 and the valve holder 85, in other words, the slider having the valve 80, the cam 90, and the block 57 at the rear end. 55 is capable of relative movement in the front-rear direction.

  As shown in FIG. 8, a cylindrical housing 110 extending in the left direction is fixed to the left end portion (lower end portion in FIG. 8) of the valve holder 85. The housing 110 has an axial direction along a circular radial direction drawn by a turning locus of the valve 80 with the valve shaft 86 as a fulcrum. The housing 110 has an open front end (left end), and a plug (movable member) 111 is slidably mounted along the axial direction of the housing 110 in the opening. As shown in FIG. 11, a rod (swivel member) 120 disposed on the lower surface side of the valve 80 is bridged between the plug 111 and the block 57 at the rear end of the slider 55. The housing 110 houses a compression spring (biasing means) 121 that biases the plug 111 in the direction toward the opening side of the housing 110 (in the direction of arrow P).

  The above-described valve 80, slider 55, cam 90, valve guide 60, suspension upper direction locking mechanism (lock bar 72 and disc gear 71), plug 111 mounted on the housing 110, compression spring 121, rod, etc. A height adjusting means 40 is configured. Subsequently, the operation of the seat height adjusting means 40 will be described.

(3) Action of sheet height adjusting means According to the sheet height adjusting means 40 of the present embodiment, a "sheet height setting function" capable of setting a sheet to a desired height, and the sheet height is automatically set. Therefore, it has a “sheet height constant function” that is kept constant.

(3-1) Seat Height Setting Function The seat height setting function can be executed by moving the valve 80 in the front-rear direction via the wire 101 using the operation member (dial, lever, etc.). That is, when it is desired to raise the seat, the valve 80 is pulled backward by the operation member. Then, as shown in FIG. 9A, the locking end portion of the rod 120 (the rod 120 is indicated by a two-dot chain line in FIG. 9) toward the plug 111 relatively moves forward, and the rod 120 Becomes an oblique state, and following this, the valve 80 swings in the direction of arrow F1. As a result, the air supply valve rod 81 is pushed by the cam 90 and the valve 80 is in the air supply state, air is supplied to the air spring 30, the link mechanism 20 extends upward, and the seat rises. When the operation of the operation member is stopped, the sheet is held at the current height.

  On the other hand, when the seat is desired to be lowered, the stop state of the valve 80 is released by the operation member. Then, the valve 80 is pulled forward by the coil spring 102 and moves forward, and as shown in FIG. 9C, the locking end of the rod 120 toward the plug 111 moves relatively rearward to move the rod 120. Is in an oblique state opposite to that shown in FIG. 9A, and the valve 80 swings in the direction of the arrow R1 following this. As a result, the exhaust valve rod 82 is pushed by the cam 90 and the valve 80 is in an exhaust state. The air in the air spring 30 is discharged from the valve 80, the link mechanism 20 is reduced downward, and the seat is lowered. When the operation of the operation member is stopped, the sheet is held at that height. The inclined position of the valve 80 during supply / exhaust is determined at a fixed position by contacting a stopper portion 91 formed at the end of the cam 90.

(3-2) Seat Height Constant Function Next, the seat height constant function is a function that keeps the seat at a constant height in a state where an occupant is seated on the seat. That is, when an occupant is seated on the seat, a load is applied to the link mechanism 20 from the upper frame, so that the link mechanism 20 is reduced downward, and the front lower roller shaft 28 advances accordingly. Then, both the lock bar 72 and the slider 55 connected to the front lower roller shaft 28 move forward.

  When the slider 55 moves forward, the block 57 moves to the front side of the valve shaft 86 as shown in FIG. 9A, and as a result, the locking end of the rod 120 toward the block 57 moves relatively forward. The locking end to the plug 111 side moves backward by reaction and becomes an oblique state. When the rod 120 is actuated obliquely in this manner, the valve 80 swings in the direction of the arrow F1, so that the valve 80 enters the air supply state when the air supply valve rod 81 is pushed by the cam 90, and the air spring 30 receives air. , The link mechanism 20 extends upward, and the sheet rises.

  When the seat rises, the front lower roller shaft 28 moves backward, so the slider 55 also moves backward, and the block 57 moves to the rear side of the valve shaft 86 as shown in FIG. As a result, the locking end of the rod 120 toward the block 57 moves relatively rearward, and the locking end toward the plug 111 moves forward by reaction, which is the reverse of FIG. 9A. It becomes diagonal. When the rod 120 is actuated obliquely in this manner, the valve 80 swings in the direction of the arrow R1. As a result, the valve 80 is exhausted by the exhaust valve rod 82 being pushed by the cam 90, and the air in the air spring 30 is exhausted. The valve 80 is discharged, the link mechanism 20 is reduced downward, and the seat is lowered.

  Thus, by repeating the supply / discharge of air to / from the air spring 30 following the expansion and contraction of the link mechanism 20, the sheet is automatically maintained at a constant height while vibrating up and down. When the seat is maintained at a constant height, as shown in FIG. 9B, the valve 80 is not inclined and is in a straight state, and the supply valve rod 81 and the exhaust valve rod 82 are not pushed by the cam 90. Thus, the air spring 30 is in a neutral state where air supply / exhaust is not performed.

  Further, in this embodiment, when the occupant stands up from the seat and the load is lost, the link mechanism 20 extends upward by the force of the air spring 30 and the seat rises, but the lock bar 72 meshes with the disc gear 71. By doing so, the rising height of the seat is regulated. For this reason, when the occupant stands up from the seat, the uncomfortable feeling that the seat suddenly rises and hits the occupant is prevented.

(3-3) Action of Compression Spring As shown in FIG. 9B, in the state where the valve 80 is in the neutral position, the compression spring 121 is expanded most and has the smallest elastic force. When the valve 80 swings from the neutral position and the valve is opened and closed as shown in FIG. 9 (a) or 9 (c), the length of the rod 120 is not changed. The compression spring 121 is slid into the housing 110 and compressed, and after passing through the middle point where the compression spring 121 is compressed most, the compression spring 121 is further rotated to expand again and the valve 80 is rotated to the valve opening / closing position. Move. The valve 80 is urged and rotated by a so-called snap action by the extension operation of the compression spring 121 when the compression spring 121 passes the most compressed intermediate point.

  Here, in the present embodiment, the valve 80 is not opened and closed when the amount of movement of the slider 55 that operates the seat height constant function is small by the action of the compression spring 121, and excessive valve opening and closing is suppressed. That is, as shown in FIG. 11 (FIGS. 11 to 14 show the lower surface side of the valve 80, F is the front and R is the rear), the seat height is adjusted and the valve 80 is in the neutral position A. 12, even if the valve 80 is retracted for a short distance to B as shown in FIG. 12, the valve 80 is not further retracted from the B position by the force of the compression spring 121. For this reason, the valve 80 does not swing as shown in FIG. 9A, and no air is supplied. That is, the non-operation range of the valve 80 is generated.

  Then, as shown in FIG. 13, when the valve 80 is retracted beyond the position B, which is the critical point of the non-operation range, the compression spring 121 compressed by the rod 120 is moved to the intermediate position as the valve 80 swings. When compressed to a point and beyond the intermediate point, the valve 80 swings to the air supply position where the air supply valve rod 81 is pushed by the cam 90. When the valve 80 is in the air supply state, the seat rises, and as shown in FIG. 14, when the block 57 of the slider 55 moves backward and reaches the vicinity of the B position, the valve 80 enters the non-operation range again, and then the air supply stops. . The above is the operation at the time of air supply, but the reverse operation occurs similarly at the time of exhaust.

  Due to the action of the compression spring 121 described above, the valve 80 is not supplied or exhausted during the small movement of the slider 55, so that frequent air supply or exhaust to the air spring 30 is avoided. For this reason, it is possible to suppress the sensitive operation of the valve 80, thereby suppressing excessive air consumption and improving the durability of the valve 80.

  Since the setting of the starting point of the opening / closing operation of the valve 80 with respect to the amount of movement of the slider 55, that is, the amount of vertical movement of the seat depends on the elastic force of the compression spring 121, the compression spring 121 is changed to a different one. Thus, the start point of the opening / closing operation of the valve 80 can be set as desired. In the above embodiment, the compression spring 121 is used as the urging means for suppressing the small movement of the slider 55. However, other means such as one using air pressure as the urging means can be used.

DESCRIPTION OF SYMBOLS 10 ... Lower frame 20 ... Link mechanism 23 ... Link shaft 28 ... Rear lower roller shaft (horizontal movement member)
DESCRIPTION OF SYMBOLS 30 ... Air spring 33 ... Oil damper 40 ... Seat height adjustment means 55 ... Slider 80 ... Valve 81 ... Supply valve rod (valve opening / closing part)
82 ... Exhaust valve rod (valve opening / closing part)
86 ... Valve shaft 90 ... Cam (cam member)
111 ... Plug (movable member)
120 ... Rod (swivel member)
121 ... Compression spring (biasing means)

Claims (1)

Lower frame,
An upper frame disposed above the lower frame and supporting the vehicle seat;
A link mechanism that supports the upper frame so as to be movable up and down with respect to the lower frame, and has a horizontal movement member that moves in the horizontal direction as the upper frame moves up and down;
An air spring that is supplied with air from an air supply source, receives a load that the upper frame receives from above, and adjusts the height of the upper frame;
A damper that absorbs the vibration of the air spring,
In a vehicle air suspension type seat support device, comprising: a seat height adjusting means for adjusting a height position of the upper frame;
The seat height adjusting means is
A valve having a valve opening / closing portion for supplying and discharging air to and from the air spring, and supported by a valve shaft extending in the vertical direction so as to be rotatable in the horizontal direction;
A slider coupled to the horizontal movement member of the link mechanism and moving along the horizontal direction integrally with the horizontal movement member;
A cam member disposed between the slider and the valve opening / closing portion of the valve;
A movable member that rotates integrally with the valve and is movable along a circular radial direction drawn by a rotation locus of the valve;
One end of the movable member and the other end of the slider are rotatably engaged with each other. The movable member is spanned between the movable member and the slider, and can be swung according to the rotation of the valve. A revolving member that causes the cam member to act on the valve opening and closing part of the valve according to the moving direction by moving the slider in the horizontal direction;
An air suspension type seat support device for a vehicle, comprising: an urging unit that elastically urges the movable member that moves in the radial direction along with the turning of the turning member in the direction of the slider.

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