JP2021079953A - Vehicle seat - Google Patents

Abstract

To prevent vibration reduction characteristics provided by an active suspension device to a seat cushion part from changing even when a position of the seat cushion part is changed in a fore and aft direction of a vehicle body by adjusting a vehicle seat in the fore and aft direction.SOLUTION: An active suspension device 40 is attached to a space between an upper rail 18 and a side frame 22 of a seat cushion part 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle seat, and more particularly to a front-rear adjustable vehicle seat having an active suspension device.

As a seat used for a vehicle body of an automobile or the like, a seat in which an active suspension device having an anti-phase generating portion that generates vibration in a phase opposite to the input vibration from the vehicle body is provided between the seat cushion portion and the vehicle is known. (For example, Patent Documents 1 and 2).

Special Table 2006-509673 Japanese Unexamined Patent Publication No. 2014-213573

In the conventional vehicle seat, the active suspension device is attached between the seat cushion portion and the floor panel of the vehicle. Therefore, when the shape of the floor panel changes, it is necessary to change the attachment structure of the active suspension device to the floor panel. Is generated, and it lacks versatility.

An active suspension device for front-rear adjustable vehicle seats in which the seat cushion is movably provided in the front-rear direction of the vehicle body by the lower rail attached to the floor panel and the upper rail (slider) movably engaged with the lower rail. Is provided between the lower rail and the floor panel. Therefore, the front-rear position of the active suspension device with respect to the seat cushion changes due to the movement of the seat cushion in the front-rear direction, and this change changes the vibration reduction characteristics given to the seat cushion by the active suspension device, resulting in an appropriate vibration reduction state. Will not be maintained.

The problem to be solved by the present invention is that the vibration reduction characteristic given to the seat cushion portion by the active suspension device changes even if the position of the seat cushion portion changes in the front-rear direction of the vehicle body due to the front-rear adjustment of the vehicle seat. At the same time, even if the shape of the vehicle body such as the floor panel is changed, it is not necessary to change the mounting structure of the active suspension device to the vehicle body.

The vehicle seat according to the present invention has a lower rail (16) fixed to the vehicle body (10) and an upper rail (18) movably engaged with the lower rail (16), and the seat is attached to the upper rail (18). A vehicle seat in which a side frame (22) of a cushion portion (20) is arranged, and an active suspension device (40, 120) is attached between the upper rail (18) and the side frame (22). There is.

According to this configuration, even if the position of the seat cushion portion (20) changes, the positional relationship between the seat cushion portion (20) and the active suspension device (40, 120) does not change in the front-rear direction. Even if the position of the seat cushion portion (20) changes, the vibration reduction characteristics given to the seat cushion portion (20) by the active suspension devices (40, 120) do not change, and stable vibration reduction is performed. Further, even if the shape of the vehicle body changes, it is not necessary to change the mounting structure of the active suspension devices (40, 120) to the vehicle body.

The vehicle seat according to the present invention preferably has a pair of left and right lower rails (16) extending in the front-rear direction, and the upper rails (18) engage with each of the left and right lower rails (16). It can move in the front-back direction.

According to this configuration, even if the position of the seat cushion portion (20) changes in the front-rear direction, the positional relationship between the seat cushion portion (20) and the active suspension device (40, 120) in the front-rear direction may change. Absent.

In the vehicle seat according to the present invention, preferably, the active suspension device (40) is individually provided on each of the front portion and the rear portion of the side frame (22).

According to this configuration, the seat cushion portion (20) can be supported at the four corners by the active suspension device (40), and vibration transmission can be effectively suppressed at each support point.

In the vehicle seat according to the present invention, preferably, a back frame (26) is attached to the rear portion of the side frame (22) by a reclining device (24) so that the inclination angle with respect to the side frame (22) can be changed. , At least one of the active suspension devices (40) is provided below the reclining device (24).

According to this configuration, the vibration transmitted to the seat cushion portion (20) can be effectively suppressed, and the riding comfort can be effectively improved.

In the vehicle seat according to the present invention, preferably, at least one of the active suspension devices (40) is provided at a position corresponding to the hip point (HP) of the seated occupant when viewed from the left and right.

According to this configuration, the vibration transmitted to the seat cushion portion (20) can be effectively suppressed at the position corresponding to the hip point (HP), and the riding comfort can be effectively improved.

The vehicle seat according to the present invention preferably has a recessed portion (28) formed in the side frame (22), and the active suspension device (40) is provided in the recessed portion (28).

According to this configuration, at least a part of the active suspension device (40) is arranged at the same height as the side frame (22) in the side view, so that the height of the seat cushion portion (20) is high. The height is suppressed by the arrangement of the active suspension device (40).

In the vehicle seat according to the present invention, preferably, the side frame (22) is formed with a downwardly open box-shaped recess (28) that is recessed from the outside to the inside of the side surface in the left-right direction. The active suspension device (40) is provided in (28).

According to this configuration, the active suspension device (40) is not bulky due to the effective use of the dead space inside the side frame (22), and the active suspension device (40) is at least partially side frame (22). ), Therefore, it is possible to prevent the height of the seat cushion portion (20) from being increased by the arrangement of the active suspension device (40).

In the vehicle seat according to the present invention, preferably, the left and right side frames (22) are provided in pairs, and the left and right ends are joined to the wall (28D) defining the recess (28), respectively. It has connecting rods (30, 32) extending in the left-right direction to connect the left and right side frames (22) to each other.

According to this configuration, the connecting strength of the left and right side frames (22) by the connecting rods (30, 32) is increased, and the seat cushion portion (20) has high rigidity based on the effective use of the recessed portion (28). It will be durable.

In the vehicle seat according to the present invention, preferably, the active suspension device (120) extends continuously in the front-rear direction between the upper rail (18) and the side frame (22).

Even in this configuration, even if the position of the seat cushion portion (20) changes in the front-rear direction, the vibration reduction characteristic given to the seat cushion portion (20) by the active suspension device (120) does not change.

In the vehicle seat according to the present invention, preferably, the active suspension device (40, 120) is connected to the liquid seal mount portion (70, 138) that performs vibration damping and the liquid seal mount portion (70, 138). It has anti-phase generators (100, 160) that generate vibrations in the opposite phase to the input vibrations from the vehicle body, and the liquid-sealed mounts (70, 138) are directly connected to the upper rail, and the anti-phase vibrations are generated. The generation unit (100, 160) is directly connected to the side frame (22).

According to this configuration, the anti-phase generators (100, 160) are not vibrated by the input vibration including the low-frequency and small-amplitude vibrations attenuated by the liquid-sealed mount (70, 138), and are reversed. The durability of the phase generating part (100, 160) is improved.

According to the vehicle seat according to the present invention, since the active suspension device is attached between the upper rail and the side frame of the seat cushion portion, the active suspension device is the seat cushion portion even if the position of the seat cushion portion changes. The vibration reduction characteristics given to the vehicle do not fluctuate. Further, even if the shape of the vehicle body changes, it is not necessary to change the mounting structure of the active suspension device to the vehicle body.

Perspective view showing the first embodiment of the vehicle seat according to the present invention. Side view of the vehicle seat according to the first embodiment Longitudinal sectional view of the active suspension device used for the vehicle seat according to the first embodiment. Side view showing the second embodiment of the vehicle seat according to the present invention. Side view showing the third embodiment of the vehicle seat according to the present invention. Longitudinal sectional view of the active suspension device used for the vehicle seat according to the third embodiment. Sectional view taken along line VII-VII of FIG.

Hereinafter, the first embodiment of the vehicle seat according to the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIGS. 1 and 2, a pair of left and right lower rails 16 are mounted substantially horizontally on the floor panel (vehicle body) 10 by front and rear mounting members 12 and 14, respectively. The left and right lower rails 16 extend parallel to each other in the front-rear direction of the vehicle body.

The upper rails 18 on the left and right corresponding sides are engaged with the left and right lower rails 16 so as to be movable in the front-rear direction of the vehicle body. Side frames 22 on the left and right corresponding sides of the seat cushion portion (seat cushion frame) 20 are attached to the left and right upper rails 18 via the active suspension device 40. As described above, a pair of left and right side frames 22 are provided, and each is provided along the extending direction of the upper rail 18.

A back frame 26 is attached to the rear portion of the side frame 22 by a reclining device 24 so that the inclination angle with respect to the side frame 22 can be changed. A cushion pad (not shown) covered with a skin material is attached to the back frame 26.

In the vicinity of the front end and the rear end of the left and right side frames 22, recessed portions 28 recessed from the outside to the inside of the side surface 22A in the left-right direction are press-molded, respectively. The recessed portion 28 has a box shape that is open downward by the front wall 28A and the rear wall 28B that are parallel to each other, and the back wall 28C and the ceiling wall (upper wall) 28D that connect the front wall 28A and the rear wall 28B to each other. There is. The recess 28 on the rear end side of the side frame 22 is below the reclining device 24. More specifically, the central position of the recess 28 in the front-rear direction is directly below the axial center position of the reclining device 24.

The left and right side frames 22 are joined to the recessed portion 28 on the rear end side of the side frame 22 on the left and right corresponding sides by welding or the like, and are connected to each other by a rear connecting rod 30 extending in the left-right direction. ing. Further, the left and right side frames 22 are joined to each other by welding or the like to the recessed portion 28 on the front end side of the side frame 22 on the side corresponding to the left and right ends, and are connected to each other by the front connecting rod 32 extending in the left and right direction. ing. More specifically, the left and right ends of the rear connecting rod 30 and the front connecting rod 32 are respectively joined to the outer surface of the concave wall 28C of the recessed portion 28. The front ends of the left and right side frames 22 are connected to each other by the front end connecting member 34.

In this way, the skeleton structure of the seat cushion portion 20 is configured, and a cushion pad (not shown) covered with a skin material is attached to the seat cushion portion 20.

There are a total of four recesses 28, and an active suspension device 40 is arranged in each recess 28. The active suspension device 40 is arranged in the recess 28 so that substantially the entire body is accommodated in the recess 28. In this way, the active suspension device 40 is individually provided on each of the front portion and the rear portion of the side frame 22. The active suspension device 40 provided at the rear portion of the side frame 22 is provided below the reclining device 24 from the position in the front-rear direction of the recessed portion 28 on the rear end side of the side frame 22.

Details of the active suspension device 40 will be described with reference to FIG. The active suspension device 40 has a lower boss member 42, a substantially cylindrical lower housing 44, and a substantially cylindrical upper inner housing 46 and an upper outer housing 48 that are caulked and coupled to the upper portion of the lower housing 44. The lower boss member 42 integrally has a mounting piece 42A protruding downward, and the mounting piece 42A is fixed to the upper rail 18 by bolts and nuts 98.

The lower end of the vibration-proof elastic body 50 made of rubber or the like is vulcanized and bonded to the lower boss member 42. The anti-vibration elastic body 50 has a substantially truncated conical shape that is inverted upside down, and the truncated side forming the lower end is vulcanized and adhered to the lower boss member 42, and the connecting member having a substantially cylindrical shape is attached to the conical hem forming the upper end. 52 is vulcanized and bonded. The connecting member 52 is fastened together with the caulked portion of the lower housing 44, the upper inner housing 46, and the upper outer housing 48.

A bottomed substantially cylindrical diaphragm 54 made of rubber or the like, one end of which is vulcanized and bonded to the lower boss member 42 and the lower end of which is vulcanized and bonded to the lower housing 44, is provided around the outer circumference of the anti-vibration elastic body 50. There is. Between the lower housing 44 and the upper inner housing 46, a partition plate 56 that vertically divides the inside of these housings is fastened together with the crimped portion of these housings.

The anti-vibration elastic body 50 and the connecting member 52 define a first liquid chamber 58 between the partition wall plate 56 and the partition plate 56. The anti-vibration elastic body 50 defines a second liquid chamber 60 with the diaphragm 54. The first liquid chamber 58 and the second liquid chamber 60 are filled with a liquid such as oil having an appropriate viscosity together with the communication passages 64 and 66 and the third liquid chamber 76 described later.

The first liquid chamber 58 and the second liquid chamber 60 are an opening 62 formed in the connecting member 52, a communication passage 64 defined between the connecting member 52 and the lower housing 44, an anti-vibration elastic body 50, and a lower housing. They communicate with each other by a communication passage 66 defined between them and 44.

In this way, the liquid sealing mount portion 70 is formed between the lower boss member 42 and the lower housing 44.

A substantially disk-shaped exciting member 74 is provided in the upper inner housing 46 by an elastic body 72 such as rubber. One end of the elastic body 72 is vulcanized and adhered to the outer peripheral surface of the vibrating member 74, and the other end is vulcanized and adhered to the inner peripheral surface of the upper inner housing 46. A third liquid chamber 76 is defined between the two. A communication hole 78 is formed in the partition plate 56. The third liquid chamber 76 communicates with the first liquid chamber 58 through a communication hole 78.

The vibration member 74 is integrally formed with a stem 80 extending from the vibration member 74 to the side opposite to the third liquid chamber 76, that is, upward, and a movable core member 82 is fixed to the upper end of the stem 80. ing. Inside the upper inner housing 46, a coil 84, a resin molding member 90 that seals the coil 84 and forms a connector portion 88 having a connection terminal 86 of the coil 84 inside, a yoke member 92, and a movable core member 82. A fixed core member 94 facing the above is attached.

The upper outer housing 48 is concentrically arranged on the outer side of the upper inner housing 46 and is fastened together with the caulked portion of the lower housing 44 and the upper inner housing 46. The upper outer housing 48 has a mounting flange portion 48A integrally on the upper side, and the mounting flange portion 48A is fixed to the ceiling wall 28D of the recessed portion 28 by a plurality of bolts and nuts 96.

The running vibration and the like are input from the floor panel 10 to the lower boss member 42 of the active suspension device 40 via the mounting member 12, the lower rail 16, and the upper rail 18. When vibration is input to the lower boss member 42, the vibration-proof elastic body 50 forming the liquid sealing mount 70 is elastically deformed by the vibration, and the volume of the first liquid chamber 58 is increased or decreased by the elastic deformation of the vibration-proof elastic body 50. Then, the enclosed liquid flows between the first liquid chamber 58 and the second liquid chamber 60 with elastic deformation of the diaphragm 54. As a result, the liquid-sealed mount 70 mainly attenuates and absorbs low-frequency and small-amplitude vibrations, and suppresses transmission of low-frequency and small-amplitude vibrations to the side frame 22.

When the coil 84 is energized and the coil 84 is excited, the movable core member 82 rises and moves due to magnetic attraction by the fixed core member 94, and the vibrating member 74 rises with elastic deformation of the elastic body 72. It moves and the volume of the third liquid chamber 76 increases. As the volume of the third liquid chamber 76 increases, the liquid enclosed in the first liquid chamber 58 flows into the third liquid chamber 76 from the communication hole 78, and the volume of the first liquid chamber 58 decreases, so that the vibration-proof elasticity The body 50 is elastically deformed downward, and the lower housing 44, the upper inner housing 46, and the upper outer housing 48 move downward with respect to the lower boss member 42.

When the energization of the coil 84 is stopped and the coil 84 is demagnetized, the magnetic attraction by the fixed core member 94 disappears, and the movable core member 82 and the vibrating member 74 descend and move due to the restoring force of the elastic body 72, and the third liquid chamber. The volume of 76 is reduced. As the volume of the third liquid chamber 76 decreases, the liquid enclosed in the third liquid chamber 76 flows into the first liquid chamber 58 from the communication hole 78, and the volume of the first liquid chamber 58 increases, so that the vibration-proof elasticity The body 50 is elastically deformed upward, and the lower housing 44, the upper inner housing 46, and the upper outer housing 48 move upward with respect to the lower boss member 42.

As a result, the energization of the coil 84 is controlled in synchronization with the input vibration from the floor panel 10, so that the lower boss member 42 fixed to the upper rail 18 and the upper outer housing 48 solidified on the side frame 22 are separated from each other. In addition, an anti-phase generation unit 100 that generates vibration having a phase opposite to the input vibration from the floor panel 10 is configured. The anti-phase generating unit 100 mainly absorbs a large-amplitude vibration by generating a vibration (displacement) that cancels the input vibration from the floor panel 10, and prevents the large-amplitude vibration from being transmitted to the side frame 22. To do.

The energization control of the coil 84 synchronized with the input vibration from the floor panel 10 can be performed based on the vertical movement of the side frame 22 detected by the acceleration sensor 102 (see FIG. 1) attached to the side frame 22. it can. As shown in FIG. 1, the acceleration sensor 102 is provided at a position close to each active suspension device 40, and even if individual control is performed for each active suspension device 40, all the active suspension devices 40 are used. The same overall control may be performed.

As described above, since the active suspension device 40 is provided between the upper rail 18 and the side frame 22, even if the position of the seat cushion portion 20 changes in the front-rear direction due to the sliding movement of the upper rail 18 with respect to the lower rail 16, the seat The positional relationship between the cushion portion 20 and the active suspension device 40 in the front-rear direction does not change. That is, since the active suspension device 40 moves in the front-rear direction together with the seat cushion portion 20, the positional relationship between the seat cushion portion 20 and the active suspension device 40 in the front-rear direction does not change.

As a result, even if the position of the seat cushion portion 20 changes in the front-rear direction due to the front-rear adjustment of the seat cushion portion 20, the vibration reduction characteristic given to the seat cushion portion 20 by the active suspension device 40 does not change, and stable vibration occurs. Reduction is done. In particular, when the active suspension device 40 is individually provided on each of the front portion and the rear portion of the side frame 22, even if the position of the seat cushion portion 20 changes in the front-rear direction, each active suspension device with respect to the side frame 22 The position of 40 does not change, and even if the position of the seat cushion portion 20 in the front-rear direction changes, the desired vibration reduction is always performed.

To reduce the vibration of the seat cushion portion 20, active suspension devices 40 are provided at the front and rear portions of the left and right side frames 22, and in particular, the active suspension device 40 on the rear side is arranged below the reclining device 24. This means that the seat cushion portion 20 is supported at the four corners to effectively suppress vibration transmission at each support point, and the seat cushion portion 20 is less likely to vibrate due to running vibration or the like to improve ride comfort. It is preferable to do so.

Further, since the active suspension device 40 is provided between the upper rail 18 and the side frame 22, even if the shape of the floor panel 10 changes, the active suspension can be simply changed by changing the mounting members 12 and 14 of the lower rail 16. There is no need to change the mounting structure of the device 40.

Since the active suspension device 40 is arranged in the recess 28 press-molded in the side frame 22, the active suspension device 40 does not become bulky due to the effective use of the dead space inside the side frame 22, and the active suspension device 40 Since at least a part of the seat cushion portion 20 is arranged at the same height as the side frame 22 in the side view, it is possible to prevent the height of the seat cushion portion 20 from being increased by the arrangement of the active suspension device 40.

Since the liquid sealing mount 70 is directly connected to the upper rail 18 on the vibration input side and the anti-phase generating unit 100 is directly connected to the side frame 22, the low frequency and small amplitude attenuated by the liquid sealing mounting 70 The anti-phase generating unit 100 is not vibrated by the input vibration including the vibration, and the durability of the anti-phase generating unit 100 can be improved. Further, since the connector portion 88 of the antiphase generating portion 100 is on the side frame 22 side, wiring from the side frame 22 side to the connector portion 88 becomes easy, and this wiring portion is not vibrated by the input vibration. ..

Further, since the rear connecting rod 30 and the front connecting rod 32 are connected to the side frame 22 in the recess 28 having a box-shaped high rigidity, the rear connecting rod 30 and the front connecting rod 32 are used to connect the left and right sides. The connection strength of the side frame 22 is increased, and the seat cushion portion 20 becomes highly rigid and durable based on the effective use of the recessed portion 28.

Next, a second embodiment of the vehicle seat according to the present invention will be described with reference to FIG. In FIG. 4, the portion corresponding to FIG. 2 is designated by the same reference numeral as that shown in FIG. 2, and the description thereof will be omitted.

In the second embodiment, the left and right active suspension devices 40 on the rear side are arranged at positions corresponding to the hip point HP of the seated occupant when viewed from the left and right directions. That is, the active suspension devices 40 on the left and right upper rails 18 are arranged at positions directly below the hip point HP when viewed from the side projection plane. The hip point HP is one of the reference points of the positional relationship between the seat and the person known in ergonomics, and is the reference point in the anteroposterior direction corresponding to the position directly below the hip joint of the person seated on the seat.

Since the hip point HP is the part where the seat cushion portion 20 bears the heaviest weight of the seated occupant, the active suspension device 40 is arranged at the position corresponding to the hip point HP in order to improve the riding comfort. In addition, it is preferable in order to efficiently and effectively reduce the vibration of the seat cushion portion 20 due to running vibration and the like.

In the second embodiment, the front side of the side frame 22 is supported by a compression type anti-vibration rubber device 110 provided between the upper rail 18 and the side frame 22 instead of the active suspension device 40. It has become.

Next, the third embodiment of the vehicle seat according to the present invention will be described with reference to FIGS. 5 to 7. In FIG. 5, the portion corresponding to FIG. 2 is designated by the same reference numeral as that shown in FIG. 2, and the description thereof will be omitted.

In the third embodiment, as shown in FIG. 5, a strip-shaped active suspension device 120 that is long in the front-rear direction is provided between the upper rail 18 and the side frame 22. The active suspension device 120 extends continuously over substantially the entire area of the upper rail 18 in the front-rear direction.

Details of the active suspension device 120 will be described with reference to FIGS. 6 and 7. The active suspension device 120 includes a plurality of lower boss members 122 arranged at intervals in the front-rear direction, a rectangular lower housing 124 elongated in the front-rear direction, and an elongated rectangular shape in the front-rear direction coupled to the upper portion of the lower housing 124. It has an upper housing 126 in shape. The lower boss member 122 integrally has a mounting piece 122A projecting downward, and the mounting piece 122A is fixed to the upper rail 18 by bolts and nuts 128.

Each lower boss member 122 is connected to the lower housing 124 by an anti-vibration elastic body 130 made of rubber or the like. The anti-vibration elastic body 130 is vulcanized and bonded to the left and right inner surfaces of the lower housing 124, and extends over the entire area in the front-rear direction of the lower housing 124. The left jump beam portion 130C, which is individually provided to connect the lower boss member 122 and the left girder portion 130A, and the lower boss member 122 and the right girder portion 130B, which are individually provided for each lower boss member 122, are connected to each other. It has a right-side jumping beam portion 130D integrally.

A diaphragm 132 made of rubber or the like is vulcanized and bonded to the lower housing 124 over the entire outer peripheral edge. The diaphragm 132 is also vulcanized and adhered to the outer peripheral surface of the lower boss member 122 so that each lower boss member 122 is exposed to the outside, and the vibration-proof elastic body 130 is formed in cooperation with the lower housing 124 and the partition plate 136 described later. The lower liquid chamber 134 to be built in is defined.

The lower liquid chamber 134, together with the upper liquid chamber 142 described later, is filled with a liquid such as oil having an appropriate viscosity.

In this way, the liquid sealing mount portion 138 is formed between the lower boss member 122 and the lower housing 124.

Between the lower housing 124 and the upper housing 126, a partition plate 136 that vertically separates the inside of these housings is fastened together with the crimped portion of these housings.

A substantially disk-shaped exciting member 140 is provided at two front and rear positions in the upper housing 126 by an elastic body 139 such as rubber. The elastic body 139 is vulcanized and bonded to the inner peripheral surface of the upper inner housing 46, and is vulcanized and bonded to the outer peripheral surface of each vibration member 140 so that each vibration member 140 is exposed to the partition wall plate 136 side. The upper liquid chamber 142 is defined between the partition plate 136 and the partition plate 136. Communication holes 144 are formed at two locations in front of and behind the partition plate 136. The communication hole 144 is provided at a position facing each vibration member 140. The upper liquid chamber 142 communicates with the lower liquid chamber 134 through a communication hole 144.

The vibration member 140 is integrally formed with a stem 146 extending from the vibration member 140 on the side opposite to the upper liquid chamber 142, that is, on the upper side, and a movable core member 148 is fixed to the upper end of the stem 146. There is. In the upper housing 126, a coil 150, a yoke member 152, and a fixed core member 154 facing the movable core member 148 are mounted for each vibration member 140.

The left and right mounting pieces 156 extending over the entire length of the upper housing 126 in the front-rear direction are joined to the left and right sides of the upper housing 126. The mounting piece 156 fixes the upper housing 126 to the lower bottom portion of the side frame 22 to a plurality of bolts and nuts 158.

The running vibration and the like are input from the floor panel 10 to the lower boss member 122 of the active suspension device 120 via the mounting member 12, the lower rail 16, and the upper rail 18. When vibration is input to the lower boss member 122, the vibration-proof elastic body 130 forming the liquid-sealing mount portion 138 is elastically deformed by the vibration. The elastic deformation of the anti-vibration elastic body 130 mainly damps and absorbs low-frequency and small-amplitude vibrations, and suppresses transmission of low-frequency and small-amplitude vibrations to the side frame 22.

When the coil 150 is energized and the coil 150 is excited, the movable core member 148 moves upward due to magnetic attraction by the fixed core member 154, and the vibrating member 140 rises with elastic deformation of the elastic body 139. It moves and the volume of the upper liquid chamber 142 increases. As the volume of the upper liquid chamber 142 increases, the liquid enclosed in the lower liquid chamber 134 flows into the upper liquid chamber 142 from the communication hole 144, and the volume of the lower liquid chamber 134 decreases, so that the vibration-proof elastic body 50 Is elastically deformed, and the lower housing 124 and the upper housing 126 move downward with respect to the lower boss member 42.

When the energization of the coil 150 is stopped and the coil 150 is demagnetized, the magnetic attraction by the fixed core member 154 disappears, the movable core member 148 and the vibrating member 140 move downward due to the restoring force of the elastic body 139, and the upper liquid chamber 142. Volume is reduced. As the volume of the upper liquid chamber 142 decreases, the liquid enclosed in the upper liquid chamber 142 flows into the lower liquid chamber 134 from the communication hole 144, and the volume of the lower liquid chamber 134 increases, so that the vibration-proof elastic body 50 Is elastically deformed, and the lower housing 124 and the upper housing 126 move up with respect to the lower boss member 122.

As a result, the energization of the coil 150 is controlled in synchronization with the input vibration from the floor panel 10, so that the lower boss member 122 fixed to the upper rail 18 and the upper housing 126 solidified on the side frame 22 are separated from each other. The anti-phase generation unit 160 that generates vibration having a phase opposite to that of the input vibration from the floor panel 10 is configured. The anti-phase generating unit 160 is configured at four locations in the front, rear, left and right of the seat cushion portion 20, and generates vibration (displacement) that cancels the input vibration from the floor panel 10, thereby mainly absorbing large amplitude vibration and large. It prevents the vibration of the amplitude from being transmitted to the side frame 22.

The energization control of the coil 150 synchronized with the input vibration from the floor panel 10 can be performed based on the vertical movement of the side frame 22 detected by the acceleration sensor (not shown) attached to the side frame 22. The control of the anti-phase generator 160 may be the same control for all four or individual controls.

Also in this embodiment, since the active suspension device 120 is provided between the upper rail 18 and the side frame 22, even if the position of the seat cushion portion 20 changes in the front-rear direction due to the sliding movement of the upper rail 18 with respect to the lower rail 16, the seat The positional relationship between the cushion portion 20 and the active suspension device 120 in the front-rear direction does not change. That is, since the active suspension device 120 moves in the front-rear direction together with the seat cushion portion 20, the positional relationship between the seat cushion portion 20 and the active suspension device 120 in the front-rear direction does not change.

As a result, even if the position of the seat cushion portion 20 changes in the front-rear direction due to the front-rear adjustment of the seat cushion portion 20, the vibration reduction characteristic given to the seat cushion portion 20 by the active suspension device 120 does not change, and stable vibration occurs. Reduction is done.

The present invention has been described above with respect to preferred embodiments thereof, but as can be easily understood by those skilled in the art, the present invention is not limited to such embodiments and deviates from the gist of the present invention. It can be changed as appropriate as long as it does not. For example, the antiphase generating units 100 and 160 are not limited to the electromagnetic type, but may be an electrostrain type or a fluid pressure type. Further, the active suspension devices 40 and 120 may be connected to the side frame 22 by the lower housings 44 and 124 instead of the upper outer housing 48 and the upper housing 126.

The vehicle seat according to the present invention is not limited to the application in which the seat cushion portion 20 can move in the front-rear direction, and the lower rail 16 and the upper rail 18 extend in the front-rear diagonal direction, and the seat cushion portion 20 extends in the front-rear direction. It can also be applied to those that can move in an oblique direction and those in which the lower rail 16 and the upper rail 18 extend in the left-right direction and the seat cushion portion 20 can move in the left-right direction. Further, in the vehicle seat according to the present invention, the lower rail 16 and the upper rail 18 extending in the front-rear direction and the lower rail 16 and the upper rail 18 extending in the left-right direction are provided in two upper and lower stages, and the seat cushion portion 20 is provided in the front-rear direction and It can also be applied to objects that can move in the left-right direction. In this case, the active suspension device 40 may be arranged on the upper rail 18 on the upper stage (seat cushion portion 20 side).

In addition, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention. For example, the liquid seal mount portion 70 is not essential and may be omitted.

10 Floor panel 16 Lower rail 18 Upper rail 20 Seat cushion part 22 Side frame 24 Reclining device 26 Back frame 28 Recessed part 30 Rear connecting rod 32 Front connecting rod 34 Front end connecting member 40 Active suspension device 42 Lower boss member 44 Lower housing 46 Upper inside Housing 48 Upper outer housing 50 Anti-vibration elastic body 52 Connection member 54 Diaphragm 56 Partition plate 58 1st liquid chamber 60 2nd liquid chamber 70 Liquid sealing mount 72 Elastic body 74 Vibration member 76 3rd liquid chamber 78 Communication hole 82 Movable Core member 84 Coil 94 Fixed core member 100 Anti-phase generator 102 Acceleration sensor 110 Anti-vibration rubber device 120 Active suspension device 122 Lower boss member 124 Lower housing 126 Upper housing 132 Diaphragm 134 Lower liquid chamber 136 Partition plate 138 Liquid seal mount 139 Elastic body 140 Vibration member 142 Upper liquid chamber 144 Communication hole 148 Movable core member 150 Coil 154 Fixed core member 160 Opposite phase generator

Claims (7)

A vehicle seat having left and right lower rails fixed to the vehicle body and left and right upper rails movably engaged with the lower rails, and the left and right side frames of the seat cushion portion are arranged on the upper rails.
A suspension device is attached between the upper rail and the side frame.
The suspension device includes a portion having a lateral dimension larger than the lateral dimension of the upper rail and overlapping the upper rail in the vertical direction, and the inner end of the suspension device is inside the inner end of the upper rail. Yes,
Further, it has a connecting rod for connecting the left and right side frames to each other.
The suspension device is a vehicle seat including one that is in the same position in the front-rear direction as the connecting rod. The vehicle seat according to claim 1, wherein the suspension device is larger than the connecting rod in the front-rear direction. The vehicle seat according to claim 1 or 2, wherein the suspension device includes a reclining mechanism that overlaps with the reclining mechanism in the vertical direction. The vehicle seat according to any one of claims 1 to 3, wherein at least a part of the suspension device is arranged at the same height as the side frame in a side view. The vehicle seat according to any one of claims 1 to 4, wherein more than half of the suspension device is arranged at the same height as the side frame in a side view. The vehicle seat according to any one of claims 1 to 5, wherein the suspension device is an active suspension device. A dent is formed in the side frame.
The active suspension device is provided in the recess.
The vehicle seat according to claim 6, wherein an acceleration sensor for detecting the vertical movement of the side frame for controlling the active suspension device is provided on a wall portion forming the recess.

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