JPH0522169U - Suspension device for vehicle seat - Google Patents

Abstract

(57) [Abstract] [Purpose] Assembly and installation work can be performed very easily and efficiently, the left and right width dimensions can be reduced, and it is effective for installation in vehicles with a narrow vehicle width, and is constant regardless of the weight of the seated person. An object of the present invention is to provide a suspension device for a vehicle seat, which can perform an appropriate front-rear cushioning operation when the acceleration is exceeded. [Structure] A lower frame fixed to the floor side of a vehicle body is provided with a suspension assembly A that supports an upper frame 2 so as to be able to perform a cushioning operation in the vertical direction via an X-shaped link mechanism 3 and a push-up spring. A stopper for restricting the relative movement of the fixed-side connecting shaft 3c and the upper frame 2 while providing a front-rear urging spring that relatively movably engages them in the front-rear direction and buffers the relative movement of the both. And a pendulum 24 having a cam surface 24d for rotating and pushing up the stopper 23 when the longitudinal acceleration of the vehicle exceeds a certain value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a suspension device for a vehicle seat such as an automobile such as a truck or an off-road vehicle, and more particularly to a suspension device for a vehicle seat having a cushioning function that reduces shock and vibration in the vertical and longitudinal directions. Regarding

[0002]

[Prior Art]

 Generally, most of the suspension devices for vehicle seats of this type have a structure as shown in FIGS. That is, in the figure, A indicates a suspension assembly, which is a frame-shaped lower frame 1 and a frame-shaped upper frame 2 which is arranged above the lower frame 1 and supports a seat cushion (not shown) of a vehicle seat. A link mechanism 3 that supports the upper frame 2 between the upper frame 2 and the lower frame 1 so that the upper frame 2 can move up and down, and a push-up spring that supports a load applied from the seat cushion to the upper frame 2 so as to perform a vertical buffering operation ( (Not shown) is assembled.

The link mechanism 3 pivotally mounts a pair of left and right link bars 3a and 3b in an X-shape, and a pair of left and right upper and lower ends of the link bars 3a and 3b, respectively. A side connecting shaft 3c and a movable side connecting shaft 3d are provided, and both ends of the upper and lower fixed side connecting shafts 3c arranged in front of them are pivotally connected to the upper frame 2 and the lower frame 1 near the front ends of the left and right channel members. Both ends of the upper and lower movable coupling shafts 3d arranged rearward are slidably slidable near the rear ends of the upper frame 2 and the left and right frame portions of the lower frame 1 via rolling rollers 3e. As the push-up spring, an air spring or a coil spring is mainly used.

Further, a pair of left and right front and rear movement rails 5 and 5 are provided on the left and right sides of the lower frame 1 so as to face each other in a parallel state. The left and right front and rear rails 5 and 5 are made of channel material, and the front and rear ends are fastened to a pair of front and rear mounting bases (rail mounts) 7 via bolts 6 and fixed to the vehicle floor.

As shown in FIG. 6, a front-rear movement roller 8 which slidably fits to the left and right front-rear movement rails 5 and guides and supports the lower frame 1 so that the lower frame 1 can move forward and backward is provided at a portion of the lower frame 1 near the left and right front and rear ends. Each is pivotally supported. In addition, front and rear direction biasing springs 9 and 10 for cushioning the front and rear directions are provided on the left and right portions of the lower frame 1, respectively. The longitudinal biasing springs 9 and 10 are tension coil springs, one end of each of which is locked to brackets 11 and 12 projecting to the left and right of the lower rail 1 and the other end of each of them. The intermediate ring members 13 are engaged with each other to be connected to each other, and the engaging pins 14 projecting from the inner surface of the front-rear movement rail 5 are engaged with the intermediate ring members 13.

The procedure for assembling and installing the vehicle seat suspension device is as follows. First, the lower frame 1, the upper frame 2, the link mechanism 3 and the push-up spring are assembled to assemble the suspension assembly A, and the left and right sides of the lower frame 1 are assembled. The front and rear movement rollers 8 are attached to the respective parts, and the front and rear direction urging springs 9 and 10 in which the intermediate ring members 13 are connected to each other are assembled. After this, the left and right front and rear movement rails 5 and 5 are respectively applied to the left and right sides of the lower frame 1 from right next to each other, and the front and rear movement rollers 8 are slidably fitted in the left and right front and rear movement rails 5 and 5, and The direction biasing springs 9 and 10 and the intermediate ring member 13 are set, and the intermediate ring member 13 is engaged with the engagement pin 14 projecting from the rails 5 and 5. While holding this state by hand, the front and rear ends of the left and right front and rear rails 5, 5 are joined to the front and rear mounting bases 7, 7 and fastened and fixed by the bolts 6. After assembling the entire suspension device in this manner, the entire device is carried into the vehicle body, and the front and rear mounting bases 7, 7 are fixed to the vehicle body floor by fastening them to bolts (not shown). And a seat cushion is attached and supported on it.

As a result, the upper frame 2 moves up and down through the link mechanism 3 in accordance with the vertical shock and vibration that occur while the vehicle is running, and the vertical movement also acts as a buffer for the push-up spring of the air spring or the like. Is alleviated by On the other hand, due to front-rear impact / vibration generated by sudden acceleration or sudden braking of the vehicle, the lower frame 1 moves back and forth along the left and right front-rear movement rails 5 and 5 via the front-rear movement rollers 8 and at the same time. The movement is moderated by the buffering action of the front-rear direction urging springs 9 and 10 via the engagement pin 14. In other words, seats that are comfortable to sit in can be obtained by cushioning shocks and vibrations in the vertical direction and in the front-back direction.

[0008]

[Problems to be solved by the device]

 By the way, in the above-described conventional vehicle seat suspension device, the left and right front and rear movement rails 5 and 5 are provided on the left and right outer sides of the lower rail 1 of the suspension assembly A in order to perform the front and rear cushioning action. Since it is configured to be slidably fitted to and engaged with the front and rear direction urging springs 9 and 10, when assembling and assembling them, the left and right front and rear movement rails 5 and 5 are separated from each other. Therefore, it must be applied directly from the side.

In this state, the left and right front and rear rails 5 and 5 are slidably fitted to the front and rear rollers 8 and the engaging pin 14 is engaged with the intermediate ring member 13 of the front and rear bias springs 9 and 10. However, since each of them is in a free state in which they can be freely disengaged right beside and can be moved back and forth against the longitudinal biasing springs 9 and 10, these left and right front and rear movement rails 5 and 5 are individually swayed. It was necessary to fasten the bolts 6 to the front and rear mounting bases 7, 7 while holding them down so that the work was very difficult and troublesome.

In addition, the left and right front and rear rails 5 and 5 are set on the left and right of the lower frame 1 as described above and fastened to the front and rear mounting bases 7, 7, that is, in the state where the entire suspension device is assembled. It must be fastened and fixed to the floor, and during this work, the front and rear mounting bases 7, 7 along with the left and right front and rear rails 5, 5 move back and forth with respect to the lower frame 1, and the entire device is heavy. , Very difficult to work with. For this reason, the conventional assembly and installation work of the suspension device is complicated, very troublesome, and inefficient.

In the suspension device for a vehicle seat having the above-described conventional configuration, the front-rear movement roller 8 and the front-rear direction biasing springs 9 and 10 are provided on the left and right outer portions of the lower frame 1, and the front and rear portions are further provided on the left and right outer sides. Since the movable rails 5 and 5 are arranged and fastened to the front and rear mounting bases and fixed to the vehicle body floor, the lateral width dimension becomes large, the installation width space is required to be large, and the vehicle width is small. Was difficult to install.

Further, in the vehicle seat suspension device having the above-described conventional configuration, since the spring force (initial operation load) of the front and rear biasing springs 9 and 10 is constant, depending on the size of the seated person, Even when the same longitudinal acceleration G is applied, there is the inconvenience that the longitudinal cushioning operation is performed or not performed. In other words, if the initial operating load of the forward and backward biasing springs 9 and 10 is set to 40 kg, and if an acceleration of about 0.5 G occurs, if the weight of the seated person sitting on the seat is about 100 kg or more, the forward and backward buffering action is performed. However, there was a problem that the front-back buffering operation was not performed when the weight was less than 60 kg. On the other hand, if the front-rear direction biasing springs 9 and 10 are made to have a weak spring force, they will fluctuate back and forth continuously while the vehicle is running, and become unstable.

The present invention has been made in view of the above circumstances. A first object of the present invention is to obtain a vertical and front-rear cushioning action, and to perform assembly and installation work very easily and efficiently, and to adjust the left-right width. It is an object of the present invention to provide a vehicle seat suspension device that can be reduced in size and is effective for installation in a vehicle with a narrow vehicle width.

In addition to the above purpose, the second purpose is to detect an acceleration in the front-rear direction and perform an appropriate front-rear cushioning operation when the acceleration exceeds a certain level, regardless of the weight of the occupant. It is an object of the present invention to provide a suspension device for a vehicle seat that can provide a seat that is comfortable to sit in.

[0015]

[Means and actions for solving the problem]

 In order to achieve the first object, a vehicle seat suspension device according to a first aspect of the present invention includes a lower frame fixed to a vehicle body floor side and an X-shaped link mechanism and a push-up spring above the lower frame. An upper frame supported so as to be capable of buffering in the vertical direction, and the fixed-side connecting shaft of the link mechanism is engaged with the upper frame or the lower frame so as to be relatively movable in the front-rear direction, and the upper frame. Alternatively, the lower frame is provided with a front-back direction urging spring that buffers relative movement in the front-back direction with respect to the fixed-side connecting shaft by cushioning.

With such a configuration, the upper frame of the suspension assembly moves up and down through the link mechanism in accordance with the vertical shock and vibration generated while the vehicle is running, and the vertical movement of the upper frame of the suspension assembly causes the upward spring such as an air spring. Is alleviated by the buffering effect of. On the other hand, due to shock and vibration in the front-rear direction caused by sudden acceleration and braking of the vehicle, the link shaft on the fixed side of the link mechanism moves back and forth with respect to the lower frame of the suspension assembly, or the link on the fixed side of the link mechanism. The upper frame moves back and forth with respect to the shaft, and the forward and rearward movement is alleviated by the buffering action of the forward and backward biasing springs provided on the upper frame or the lower frame. This softens the shocks and vibrations in the up-down and front-rear directions, resulting in a comfortable seat.

Further, in the suspension device for a vehicle seat according to the first aspect of the present invention, since the left and right rails for forward and backward movement as in the prior art are not required, the assembly and installation work of the entire device can be performed very easily and efficiently. At the same time, the lateral width can be reduced, which is effective for installation in vehicles with a narrow vehicle width.

In order to achieve the second object, a suspension device for a vehicle seat according to a second aspect is fixed to the upper frame or the lower frame in the suspension device for a vehicle seat according to the first aspect. A stopper is provided for restricting relative movement in the front-rear direction with respect to the side connecting shaft, and an acceleration detection means for releasing the restriction of the stopper when the acceleration in the front-rear direction of the vehicle exceeds a certain value. To do.

With such a configuration, in addition to the operation of the first device described above, the link mechanism is connected to the lower frame of the suspension assembly due to the shock and vibration in the front-rear direction generated by the sudden acceleration or the sudden break of the vehicle. Of the fixed side connecting shaft of the link mechanism or the upper frame of the link mechanism fixed side connecting shaft tries to move back and forth, but if the longitudinal acceleration at this time is less than a certain value, the back and forth movement is restricted by the stopper. It is stable without fluttering back and forth. When the longitudinal acceleration exceeds a certain value, the acceleration detecting means operates to release the restriction of the stopper, the fixed connecting shaft or the upper frame moves back and forth, and the longitudinal biasing spring performs a buffering operation. become. As a result, regardless of the weight of the seated person, an appropriate front-back cushioning effect can be obtained, and a seat that is even more comfortable to sit can be obtained.

The vehicle seat suspension device according to the third aspect of the invention serves as acceleration detecting means in the vehicle seat suspension device according to the second aspect of the invention and is rotated by acceleration in the longitudinal direction of the vehicle to release the stopper. It is characterized by using a pendulum having a cam surface that operates. This makes it possible to mechanically and reliably detect acceleration in the front-rear direction above a certain value and reliably release the stopper restriction.

[0021]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

It should be noted that the same components as those shown in FIGS. 5 and 6 in the drawings are designated by the same reference numerals to simplify the description, and the overall configuration is the left and right front and rear rails 5 and 5 and the front and rear movement rails. 5 is substantially the same as that of FIG. 5 except that the mounting bases 7 and 7 are not provided, and therefore the illustration thereof is omitted.

First, FIG. 1 is a perspective view showing only an upper half portion of a suspension assembly A of a suspension device for a vehicle seat. The suspension assembly A includes a lower frame 1 and an upper frame 2 assembled in a rectangular frame shape as shown in FIG. 5, and an X-shaped link for supporting the upper frame 2 above the lower frame 1 so as to be able to perform a vertical buffering operation. It is composed of a mechanism 3 and a push-up spring (not shown). A seat cushion (not shown) can be attached on the upper frame 2. The lower frame 1 is fastened and fixed directly on the vehicle body floor.

The link mechanism 3 pivotally mounts a pair of left and right link bars 3a and 3b in an X-shape, and a pair of upper and lower fixed sides connected to the upper and lower ends of the link bars 3a and 3b, respectively. A shaft 3c and a movable side connecting shaft 3d are provided, and both ends of the upper and lower fixed side connecting shafts 3c arranged in front of the shaft 3c are pivotally connected to the upper frame 2 and the lower frame 1 near the front ends of the left and right channel members, and arranged in the rear. Both ends of the upper and lower movable connecting shafts 3d are slidably slidable toward the rear end of the upper frame 2 and the lower right frame portion of the lower frame 1 via rolling rollers 3e.

Here, as shown in FIG. 1, elongated holes 2b each having an appropriate length in the front-rear direction are formed at the front end portions of the left and right channel members 2a of the upper frame 2 of the suspension assembly A, respectively. Both ends of the fixed side connecting shaft 3c arranged on the upper front side of the X-shaped link mechanism 3 are slidably engaged with these elongated holes 2b, and the fixed side connecting shaft 3c and the upper frame 2 are relatively opposed to each other in the front-rear direction. It is movable. That is, the upper frame 2 is supported by the X-shaped link mechanism 3 so as to be movable back and forth without having left and right front and rear rails.

Further, U-shaped brackets 15 are fixed to the left and right outer sides of the upper frame 2 by welding or the like as shown in FIGS. 1 and 2, and front and rear direction biasing springs 17 and 18 are attached to the brackets 15 via guide shafts 16. Are installed in series. These longitudinal bias springs 15 and 16 are compression coil springs, respectively, and a piece-shaped intermediate member 19 is slidably fitted on the guide shaft 16 and interposed therebetween. The intermediate member 19 has an H-shaped cross section, and has upper and lower engaging grooves 19a. A lateral U-shaped portion of a joint 20 connected to both ends of the fixed side connecting shaft 3c is inserted into and engaged with the upper and lower engaging grooves 19a of the intermediate member 19. With this, the movement of the upper frame 2 in the front-rear direction with respect to the fixed-side connecting shaft 3c of the X-shaped link mechanism 3 is buffered by the front-rear direction biasing springs 17 and 18.

On the other hand, as shown in FIGS. 1 and 3 and 4, a U-shaped bracket 21 is fixed to the rear surface of the front end frame member 2c of the upper frame 2, and a base end portion (front end portion ) Is pivotally attached, and the stopper 23 is attached so as to be vertically rotatable in a state of protruding rearward. The stopper 23 has an inverted U-shaped engaging concave portion 23a at a portion near the front end (close to the rear end) of the lower surface, and in a normal state, the stopper 23 is mounted on the fixed side connecting shaft 3c of the X-shaped link mechanism 3 in a horse riding shape. The engaging recesses 23a are engaged with each other to restrict the relative movement of the fixed side connecting shaft 3c and the upper frame 2 in the front-rear direction.

Further, there is provided acceleration detecting means for releasing the restriction of the stopper 23 when the longitudinal acceleration of the vehicle exceeds a certain value. This acceleration detecting means uses a mechanical pendulum 24. The pendulum 24 is composed of a substantially oval-shaped side head portion 24b penetrating the shaft 24a and a side-surface substantially fan-shaped weight portion 24c integrally connected to the lower side of the head portion 24b. The top is the cam surface 24d. The pendulum 24 is vertically oscillatably supported by supporting a shaft 25a on a bracket 25 fixed to the lower surface of the front end frame member 2c of the upper frame 2, and is attached to the bracket 25 and the shaft 24a. The torsion coil spring 26 that is stopped prevents excessive swinging. When the acceleration in the front-rear direction of the vehicle exceeds a certain value, the cam 23d largely rotates and pushes up the stopper 23 by the cam surface 24d to disengage the engaging recess 23a from the fixed side connecting shaft 3c. The restriction on the relative movement of the fixed side connecting shaft 3c and the upper frame 2 in the front-rear direction is released.

According to the above-described vehicle seat suspension device, the lower frame 1, the upper frame 2, the link mechanism 3, and the push-up spring are assembled to assemble the suspension assembly A, and the suspension assembly A is directly carried into the vehicle interior. Then, the lower frame 1 is fastened and fixed on the vehicle body floor.

At the time of assembling and installing the suspension assembly A, U-shaped brackets 15 are fixed to the left and right outer sides of the upper frame 2, and the guide shafts 16 are provided inside the brackets 15 to urge the springs 17 and 18 in the front-rear direction and the intermediate member 19. On the other hand, both ends of the fixed side connection shaft 3c of the X-shaped link mechanism 3 are inserted into the elongated holes 2b near the front ends of the left and right channel members 2a of the upper frame 21 so as to be movable back and forth and connected to the joint 20. ..

Further, a U-shaped bracket 21 is fixed to the back surface of the front end frame member 2c of the upper frame 2, and a stopper 23 is attached to the bracket 23 via a pivot 22, and the engaging recess 23a on the lower surface of the stopper 23 is the X-shaped portion. Bracket on which the pendulum 24 serving as an acceleration detecting means is fixed to the lower surface of the front end frame member 2c of the upper frame 2 while being engaged with the fixed side connecting shaft 3c of the linear link mechanism 3 in a horse riding state. 25, and a torsion coil spring 26 is locked to the bracket 25 and the shaft 24a. This completes the assembly and installation work of the entire suspension device, and since the left and right rails for front and rear movement are not used, the troublesome and troublesome assembly work is unnecessary, and the assembly and installation of the entire device can be performed very easily and efficiently. In addition, the lateral width can be reduced, which is effective for installation in vehicles with a narrow vehicle width.

Further, in the vehicle seat suspension device assembled and installed as described above, the upper frame 2 moves up and down through the link mechanism 3 in accordance with the vertical shock and vibration that occur while the vehicle is running. The vertical movement is alleviated by the cushioning action of a push-up spring such as an air spring.

On the other hand, the upper frame 2 tries to move back and forth with respect to the fixed-side connecting shaft 3c of the link mechanism of the suspension assembly A due to the shock and vibration in the front-rear direction generated by the sudden acceleration or the sudden braking of the vehicle. If the longitudinal acceleration at this time is less than a certain value, the longitudinal movement is restricted by the stopper 23 and is stable without swaying back and forth. When the longitudinal acceleration exceeds a certain value, the pendulum 24 as an acceleration detecting means swings largely against the torsion coil spring 26, and the cam surface 24d on the head portion 24b at the upper end pushes up the stopper 23. At the very least, the engaging recess 23a is disengaged from the fixed side connecting shaft 3c to release the restriction of the relative movement of the fixed side connecting shaft 3c and the upper frame 2 in the front-rear direction. Only in this state, the upper frame 2 moves back and forth with respect to the fixed side connecting shaft 3c, and the front-rear direction biasing springs 17 and 18 perform an appropriate front-rear cushioning action regardless of the weight of the seated person. .. This softens the shocks and vibrations in the up-down and front-rear directions and provides a comfortable seat.

In the above-described embodiment, the upper frame 2 is movable in the front-rear direction with respect to the fixed-side connecting shaft 3c of the X-shaped link mechanism 3 of the suspension assembly A, and the cushioning operation is performed. However, it is also possible to make the fixed side connecting shaft 3c of the X-shaped link mechanism 3 movable in the front-rear direction with respect to the lower frame 1 so as to perform the buffering operation. In this case, although not shown, an elongated hole into which the fixed side connecting shaft 3c of the X-shaped link mechanism 3 slides is formed in the lower frame 1, a longitudinal biasing spring is provided, and a stopper and a pendulum are further provided. .. Even with this, substantially the same operational effects as the above-mentioned embodiment can be obtained.

[0035]

[Effect of the device]

 Since the vehicle seat suspension device of the present invention is configured as described above, a seat that is comfortable to sit in can be obtained by cushioning shocks and vibrations in the upper, lower, and front-rear directions, and the assembly and installation work is extremely easy and efficient. In addition to being able to be carried out, the lateral dimension can be reduced, which is effective for installation in a vehicle with a narrow vehicle width.

Further, by detecting the longitudinal acceleration and irrespective of the weight of the seated person, if the acceleration exceeds a certain level, an appropriate front-back cushioning operation can be performed, and a more comfortable seat can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an upper half portion of a suspension assembly showing an embodiment of a vehicle seat suspension device of the present invention.

FIG. 2 is an exploded perspective view showing the relationship between the fixed-side connecting shaft and the front-rear direction urging spring of the link mechanism of the above embodiment.

FIG. 3 is an exploded perspective view showing the relationship between the stopper and the pendulum of the acceleration detecting means of the embodiment.

4A and 4B are side views showing an operating state of the stopper and the pendulum.

FIG. 5 is a schematic perspective view of the entire vehicle seat suspension device showing a conventional example.

FIG. 6 is an exploded perspective view of a lower frame and left and right front and rear movement rails of the conventional example.

[Explanation of symbols]

A ... Suspension assembly, 1 ... Lower frame, 2 ... Upper frame, 3 ... Link mechanism, 3c ... Fixed side connecting shaft, 17, 18 ... Front-back direction urging spring, 23 ... Stopper,
24 ... Acceleration detecting means (pendulum), 24d ... Cam surface.

Claims (3)

[Scope of utility model registration request] 1. A lower frame fixed to a vehicle body floor side, and an upper frame which is supported above the lower frame via a X-shaped link mechanism and a push-up spring so as to be capable of buffering in a vertical direction, and the upper frame is provided on the upper frame. In a vehicle seat suspension device that supports a seat cushion, a fixed-side connecting shaft of the link mechanism is engaged with an upper frame or a lower frame so as to be relatively movable in the front-rear direction, and the fixing is performed on the upper frame or the lower frame. A suspension device for a vehicle seat, comprising a front-rear urging spring for cushioning relative movement in the front-rear direction with respect to a side coupling shaft. 2. The vehicle seat suspension device according to claim 1, further comprising a stopper that restricts relative movement of the upper frame or the lower frame and the fixed-side connecting shaft in the front-rear direction, and the acceleration in the front-rear direction of the vehicle. A suspension device for a vehicle seat, comprising an acceleration detecting means for releasing the restriction of the stopper when the value exceeds a certain value. 3. The suspension device for a vehicle seat according to claim 2, wherein a pendulum having a cam surface that is rotated by an acceleration in a longitudinal direction of the vehicle to push up and release the stopper is used as the acceleration detecting means. Characteristic vehicle seat suspension device.