JP7060817B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat provided with an occupant detection sensor that detects the presence or absence of an occupant.

In recent years, some seats of automobiles and the like are equipped with an occupant detection sensor that detects whether or not an occupant is sitting. Since such an occupant detection sensor operates a seatbelt reminder and an occupant restraint device, it is used to detect the presence or absence of an occupant. For example, in Patent Document 1, a seat provided with a pressure-sensitive switch (occupant detection sensor) arranged under the cushion pad for detecting the presence or absence of an occupant and a sensor mounting base for supporting the occupant detection sensor from below. The device is disclosed.

Japanese Unexamined Patent Publication No. 2014-210554

By the way, in a vehicle seat provided with an occupant detection sensor, if the occupant detection sensor is not stably supported, the detection accuracy may decrease. Further, it is desirable that the configuration for stably supporting the occupant detection sensor is simple.

Therefore, an object of the present invention is to provide a vehicle seat capable of improving the accuracy of detection by the occupant detection sensor.
Another object of the present invention is to provide a vehicle seat capable of stably supporting an occupant detection sensor with a simple configuration.
Another object of the present invention is to provide a vehicle seat that can be made compact and cost-reduced.
Another object of the present invention is to provide a vehicle seat capable of reducing contact noise.
Another object of the present invention is to provide a vehicle seat to which an electric wire extending from an occupant detection sensor can be easily attached.
Another object of the present invention is to provide a vehicle seat capable of improving the maneuverability of the electric wire extending from the occupant detection sensor and reducing the load applied to the electric wire.

The vehicle seat for achieving the above-mentioned object is a vehicle seat including a seat frame, a cushion member, and a skin, which is arranged under the cushion member and detects the presence or absence of an occupant. A sensor, a sensor support member that supports the occupant detection sensor from below, and a plurality of seat springs erected on the seat frame are provided, and the seat frame includes a pair of side frames and the pair of side frames. It has a pan frame that connects front ends to each other, and the occupant detection sensor is configured to detect an occupant by being sandwiched between the cushion member and the sensor support member when the occupant sits down. The sensor support member is a member that connects the plurality of seat springs to each other, and is arranged so as to overlap the pan frame when viewed from the vertical direction. The upper end portion of the occupant detection sensor is the upper end portion of the pan frame. It is characterized by being located below.

In the vehicle seat described above, the upper end portion of the sensor support member may be configured to be located below the upper end portion of the pan frame.

In the vehicle seat described above, the rear end portion of the sensor support member may be configured to be located behind the rear end portion of the pan frame.

In the vehicle seat described above, the sensor support member may be configured to extend forward of the occupant detection sensor.

In the vehicle seat described above, the sensor support member has holes that penetrate vertically, and the holes may be provided at positions that overlap with the pan frame when viewed from the vertical direction.

The vehicle seat described above includes an electric wire extending from the occupant detection sensor, and the electric wire may be configured such that the lower side of the pan frame extends from the rear side to the front side of the occupant detection sensor.

In the vehicle seat described above, the electric wire may be fixed to the lower surface of the pan frame.

Further, the vehicle seat is a vehicle seat including a seat frame and a cushion member, and is arranged on the side opposite to the occupant side of the cushion member, and has a occupant detection sensor for detecting the presence or absence of an occupant and the occupant. A sensor support member that supports the detection sensor from the side opposite to the occupant side is provided, the seat frame has a pan frame, and the occupant detection sensor supports the cushion member and the sensor when the occupant sits down. The sensor support member is configured to detect an occupant by being sandwiched between the members, and the sensor support member is characterized in that at least a part of the sensor support member is in contact with the pan frame and is supported by the pan frame.

According to such a configuration, the occupant detection sensor is supported by the pan frame via the sensor support member, so that the occupant detection sensor can be stably supported with a simple configuration.

The vehicle seat described above may include a plurality of seat springs erected on the seat frame, and the sensor support member may be configured to be a member that connects the plurality of seat springs to each other.

According to this, since the member connecting the seat spring can be used as a member for supporting the occupant detection sensor, it is possible to reduce the size and cost.

In the vehicle seat described above, the pan frame has a first portion and a second portion arranged so as to be offset from the occupant side with respect to the first portion, and the sensor support member has one end. The portion may be in contact with and supported by the first portion, and the other end portion may be arranged apart from the second portion.

According to this, since the contact area between the sensor support member and the pan frame can be reduced, the contact sound between the sensor support member and the pan frame can be reduced. Further, since a gap is formed between the sensor support member and the second portion of the pan frame, for example, an electric wire extending from the occupant detection sensor and a clip for attaching the electric wire are arranged by using this gap. can do.

In the vehicle seat described above, the electric wire extending from the occupant detection sensor can be configured to be attached to the second portion.

According to this, the electric wire can be easily attached with a clip or the like by utilizing the gap between the sensor support member and the second portion.

In the vehicle seat described above, the sensor support member is inclined toward the surface on the occupant side in a direction away from the occupant side, and the electric wire extending from the occupant detection sensor is inclined to guide the electric wire extending from the occupant detection sensor to the side opposite to the occupant side of the sensor support member. It can be configured to have a surface.

According to this, it is possible to improve the maneuverability of the electric wire and reduce the load applied to the electric wire from the cushion member when the occupant sits down.

In the vehicle seat described above, the pan frame has a support portion to which the sensor support member is contacted and supported, and a protrusion portion protruding from the support portion toward the occupant side, and the sensor support member is the sensor support member. The sensor support member may be configured to have a holding portion arranged so as to sandwich the protruding portion in a state of being supported by the supporting portion.

According to this, since the position of the sensor support member can be stabilized, the occupant detection sensor can be supported more stably.

In the vehicle seat described above, the sensor support member may be configured to have a recess that can accept the protrusion.

According to this, since the position of the sensor support member can be made more stable, the occupant detection sensor can be supported more stably.

In the vehicle seat described above, the seat spring has a hooking portion to be hooked on the pan frame, and the sensor support member is made of resin and is supported in contact with the pan frame. And a covering portion that covers the hooking portion, and the main body portion and the covering portion may be integrally molded.

According to this, it is possible to reduce the contact sound between the sensor support member and the pan frame and the contact sound between the seat spring and the pan frame.

According to the present invention, the accuracy of detection by the occupant detection sensor can be improved.
In addition, the occupant detection sensor can be stably supported with a simple configuration.

Further, by using the sensor support member as a member for connecting the seat spring, it is possible to reduce the size and cost.

Further, by adopting a configuration in which one end of the sensor support member is in contact with and supported by the first portion and the other end is arranged away from the second portion, the contact noise between the sensor support member and the pan frame is reduced. can do.

Further, by attaching the electric wire extending from the occupant detection sensor to the second portion, the electric wire can be easily attached with a clip or the like.

In addition, the sensor support member is provided with an inclined surface that guides the electric wire to the side opposite to the occupant side of the sensor support member, thereby improving the maneuverability of the electric wire and the load applied from the cushion member to the electric wire when the occupant sits down. Can be reduced.

Further, by providing the sensor support member with a holding portion arranged so as to sandwich the protruding portion of the pan frame, the occupant detection sensor can be supported more stably.

Further, by providing the sensor support member with a recess that can accept the protrusion, the occupant detection sensor can be supported more stably.

Further, by making the sensor support member made of resin and providing a covering portion that covers the hooked portion of the seat spring, the contact noise between the sensor support member and the pan frame and the contact noise between the seat spring and the pan frame are reduced. be able to.

It is a perspective view of the vehicle seat as the vehicle seat which concerns on embodiment. It is a perspective view of the cushion frame which constitutes a seat frame. It is a top view of a cushion frame, a seat spring and a connecting member. 3A is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 3B is an enlarged cross-sectional view taken along the line AA of the connecting member. FIG. 3 is a cross-sectional view taken along the line BB of FIG. It is a perspective view of a connecting member, a leaf spring member, an occupant detection sensor and a clip. It is an exploded perspective view of the occupant detection sensor. It is sectional drawing of the seat cushion corresponding to the CC cross section of FIG. It is sectional drawing of the seat cushion corresponding to FIG. 8 which shows the state when an occupant sits down. It is a figure which shows the connecting member and the occupant detection sensor which concerns on the 1st modification. It is a figure which shows the connecting member which concerns on the 2nd modification. It is a figure (a), (b) which shows the occupant detection sensor which concerns on the 3rd modification.

Hereinafter, embodiments of the invention will be described in detail with reference to the drawings as appropriate. In the present invention, the front / rear, left / right, and up / down are based on the direction seen from the occupant sitting on the vehicle seat.
As shown in FIG. 1, the vehicle seat according to the present embodiment is a vehicle seat S used in an automobile, and includes a seat cushion S1, a seat back S2, and a headrest S3.

The vehicle seat S has a built-in seat frame F as shown in FIG. The seat frame F is mainly composed of a cushion frame F1 constituting the frame of the seat cushion S1 and a seat back frame (not shown) constituting the frame of the seat back S2. The vehicle seat S is configured by covering the seat frame F with the cushion member 60 and the skin 70, as shown in FIG. 8 using the seat cushion S1 as an example.

As shown in FIG. 2, the cushion frame F1 constituting the seat frame F includes a pair of side frames 11 arranged apart from each other on the left and right, and a pan frame 12 connecting the front ends of the pair of side frames 11 to each other. It has a connecting pipe 13 that connects the rear ends of the pair of side frames 11, and these are formed in a frame shape that is integrally connected by welding or the like. The side frame 11 and the pan frame 12 are formed by pressing a metal plate or the like, and the connecting pipe 13 is made of a metal pipe.

A plurality of seat springs 20 as wire-like members are erected between the pan frame 12 of the cushion frame F1 and the connecting pipe 13. More specifically, in the plurality of seat springs 20, four (20A to 20D) are arranged side by side, the front end of each seat spring 20 is hooked on the pan frame 12, and the rear end is the connecting pipe 13. By being hooked on, it is erected in the front-back direction (direction orthogonal to the left-right direction).

Each of the plurality of seat springs 20 is a spring formed by bending a metal wire in a zigzag manner so as to meander from side to side. Each seat spring 20 has eight left-right extending portions 21 extending in the left-right direction (direction in which a plurality of seat springs 20 are lined up) and a portion extending in the front-rear direction (direction in which the seat spring 20 is erected) 7. It has two front-rear extending portions 22 and a pipe hooking portion 23 to be hooked on the connecting pipe 13. The left and right extension portions 21 are arranged side by side in the front-rear direction. The front left and right extending portions 21 are hooking portions that are hooked on the hook portions 12H formed on the pan frame 12. The front-rear extension portions 22 are provided so as to connect the ends of the adjacent left and right extension portions 21, and are arranged alternately on the left and right sides. The pipe hooking portion 23 extends upward from the end portion of the rearmost left and right extending portion 21, and is formed so that the upper end portion is curved like a hook.

As shown in FIG. 3, the adjacent seat springs 20 are formed symmetrically. Specifically, the seat spring 20B (first seat spring) and the seat spring 20C (the second seat spring arranged adjacent to the first seat spring) are formed symmetrically, and the seat spring 20A and the seat are formed. The spring 20B is formed symmetrically, and the seat spring 20C and the seat spring 20D are formed symmetrically.

The seat spring 20 is connected by a plurality of connecting members 30A to 30F. The connecting members 30A to 30F are made of resin and are integrally molded with the seat springs 20A to 20D by insert molding.

The rearmost connecting member 30A is a member that connects the rear ends of the seat springs 20A and 20B or the rear ends of the seat springs 20C and 20D. More specifically, the connecting member 30A covers the portion of the pipe hooking portion 23 in contact with the connecting pipe 13, and the pipe hooking portions 23 of the seat springs 20A and 20B or the pipe hooking portions of the seat springs 20C and 20D are hooked. The portions 23 are formed so as to be connected to each other. Since the pipe hooking portion 23 is covered with the resin connecting member 30A, the contact noise between the seat spring 20 and the connecting pipe 13 can be reduced.

The connecting member 30B arranged second from the rear is a member that connects the rear end portions of the seat springs 20A to 20D. More specifically, the connecting member 30B is formed so as to cover the rearmost left and right extending portions 21 of the seat springs 20A to 20D and the rear end portions of the front and rear extending portions 22 so as to connect them. ..

The connecting member 30C arranged at the center in the left-right direction, which is the third from the rear, is a member that connects the rear ends of the seat springs 20B and 20C. More specifically, the connecting member 30C is formed so as to connect the front end portions of the rearmost front and rear extending portions 22 of the seat springs 20B and 20C. Further, the connecting member 30C connects the rearmost front / rear extension portion 22 of one seat spring 20B and the second left / right extension portion 21 from the rear, and the rearmost front / rear extension portion of one seat spring 20C. It is formed so as to connect the 22 and the second left and right extension portion 21 from the rear.

The connecting members 30D arranged on the left and right sides of the connecting member 30C are formed so as to connect the rearmost front-rear extending portion 22 of the seat spring 20A or the seat spring 20D and the second left-right extending portion 21 from the rear. ..

The fourth connecting member 30E arranged from the rear is a member that connects substantially the central portions of the seat springs 20A to 20D in the front-rear direction. More specifically, the connecting member 30E includes the seat springs 20B and 20C with the third front and rear extension portions 22 from each other, the seat springs 20A and 20B with the fourth front and rear extension portions 22 from each other, and the seat spring 20C. , 20D is formed so as to connect the fourth front and rear extension portions 22 to each other. Further, the connecting member 30E is formed so as to connect the front and rear extending portions 22 and the left and right extending portions 21, which are the fourth from the rear of the seat springs 20A to 20D.

The connecting member 30F arranged at the front is a member that connects the front end portions of the seat springs 20B and 20C. More specifically, the connecting member 30F has a substantially plate-shaped main body portion 31, and the main body portion 31 is formed so as to connect the second front and rear extending portions 22 from the front of the adjacent seat springs 20B and 20C. Has been done. Further, the main body portion 31 connects the second and third left and right extension portions 21 from the front of the one seat spring 20B, and also connects the second and third left and right extension portions 21 from the front of the one seat spring 20C. It is formed so as to connect 21 to each other. With such a configuration, the seat springs 20B and 20C can be firmly connected, so that, for example, the seat springs 20B and 20C can be operated as an integral spring.

The connecting member 30F has a pair of covering portions 32 arranged apart from each other on the left and right sides on the front side of the main body portion 31. The covering portion 32 is formed so as to cover the front left and right extending portions 21 (hooking portions) and the front and rear extending portions 22 of the seat springs 20B and 20C, and is integrally formed with the main body portion 31. The front left and right extension portions 21 (hooking portions) and front and rear extension portions 22 of the seat springs 20A and 20D, the second left and right extension portions 21 and front and rear extension portions 22 from the front, and 3 from the front. The second left and right extending portion 21 is covered with a resin covering portion 30G. The front left and right extending portions 21 (hooking portions) to be hooked on the pan frame 12 are covered with resin covering portions 32 and 30G, thereby reducing the contact noise between the seat spring 20 and the pan frame 12. can do.

The connecting member 30F is provided at the center of the seat cushion S1 in the substantially left-right direction, and a part of the connecting member 30F is in contact with the pan frame 12 and is supported by the pan frame 12. Specifically, as shown in FIG. 4A, the pan frame 12 has a support portion 12A as a first portion and a first extension extending substantially downward from the rear end of the support portion 12A at the rear end portion. The second extension portion as a second portion arranged so as to be displaced downward (opposite to the occupant side) with respect to the support portion 12A by extending rearward from the rear end of the portion 12B and the first extension portion 12B. It has 12C. Then, in the connecting member 30F, the front end portion as one end portion (more specifically, the front end portion of the main body portion 31 and the holding portion 32A described later of the covering portion 32) comes into contact with the support portion 12A from above and reaches the support portion 12A. It is supported.

With such a configuration, the seat springs 20B and 20C are in contact with and supported by the pan frame 12 via the connecting member 30F. Further, as shown in FIG. 3, the seat springs 20A and 20D are supported in contact with the pan frame 12 via the covering portion 30G. As a result, the contact noise between the seat spring 20 and the pan frame 12 can be reduced. Further, since the connecting member 30F and the covering portion 30G are made of resin, the contact noise between these and the pan frame 12 can be reduced.

Returning to FIG. 4A, the rear end portion (rear end portion of the main body portion 31) as the other end of the connecting member 30F is separated from the second extension portion 12C and floats from the second extension portion 12C. It is arranged in such a state. As a result, a gap is formed between the rear end portion of the connecting member 30F and the second extending portion 12C. Since the front end portion of the connecting member 30F is in contact with and supported by the pan frame 12, and the rear end portion is separated from the pan frame 12, the contact area between the connecting member 30F and the pan frame 12 can be reduced. Also, the contact noise between the connecting member 30F and the pan frame 12 can be reduced.

As shown in FIG. 5, the pan frame 12 has a protruding portion 12D protruding upward (passenger side) from the support portion 12A. The portion of the pair of covering portions 32 that covers the front-rear extending portion 22 (pinching portion 32A) is arranged so as to sandwich the protruding portion 12D from the left and right while the connecting member 30F is supported by the support portion 12A. As a result, the position of the connecting member 30F can be stabilized. Further, as shown in FIG. 6, the main body portion 31 of the connecting member 30F has a concave portion 33 having a shape recessed rearward in a portion between the pair of covering portions 32 at the front end portion thereof. The recess 33 is formed with a width and a depth that can accommodate the protrusion 12D of the pan frame 12. As a result, the recess 33 is arranged so as to sandwich the protrusion 12D together with the holding portion 32A from the left and right, so that the position of the connecting member 30F can be further stabilized.

An occupant detection sensor 40 and a leaf spring member 50 as a spring member are attached to the upper surface of the connecting member 30F. That is, the connecting member 30F also functions as a member (sensor support member) that supports the occupant detection sensor 40 from below by attaching the occupant detection sensor 40. As a result, the member connecting the seat spring 20 can be used as a member for supporting the occupant detection sensor 40 and the like, so that the size and cost can be reduced. The connecting member 30F is supported by the cushion frame F1 via a seat spring 20 erected on the cushion frame F1.

The occupant detection sensor 40 is a sensor configured to detect the presence or absence of an occupant by operating when the occupant sits down. The occupant detection sensor 40 includes a base 41 attached to the connecting member 30F and a pair of detection units 42 (first detection unit 42A and second detection unit 42) provided at both left and right ends of the base 41 so as to be connected to the base 41. 42B) and. The base 41 has a pair of sensor-side through holes 43 (through holes) provided so as to penetrate vertically in order to attach the occupant detection sensor 40 to the connecting member 30F.

As shown in FIG. 7, the occupant detection sensor 40 is formed by stacking and laminating the first sheet 40A, the second sheet 40B, and the third sheet 40C, which have flexibility. Each sheet 40A, 40B, 40C has through holes 43A, 43B, 43C forming a sensor-side through hole 43 when stacked. The first sheet 40A has two electrodes E1 formed on the left and right ends of the upper surface, and a pair of wirings W1 extending inward in the left-right direction from each electrode E1 along the rear ends of the first sheet 40A. Have. An electric wire 44 is drawn out from each wiring W1. Further, the first sheet 40A has an exhaust port 45 provided in a portion serving as a base 41 so as to vertically penetrate between the through holes 43A (a pair of sensor-side through holes 43). The third sheet 40C includes two electrodes E2 formed on the left and right ends of the lower surface, and wiring W2 extending along the front end of the third sheet 40C to electrically connect the two electrodes E2. have. The second sheet 40B avoids the pair of through holes 46A provided at positions facing the pair of electrodes E1 and E2, the through holes 46B provided at positions facing the exhaust port 45, and the through holes 43B. It has an exhaust groove 46C provided so as to connect the left and right through holes 46A and the central through hole 46B.

By stacking the first sheet 40A, the second sheet 40B, and the third sheet 40C together, the pair of upper and lower electrodes E1 and E2 face each other with a space between them through the through holes 46A (second sheet 40B). The through hole 46B and the exhaust port 45 communicate with each other. The detection unit 42 is a portion where a pair of electrodes E1 and E2 are arranged. A filter 40D is attached to the lower surface of the first seat 40A (occupant detection sensor 40) so as to cover the exhaust port 45. The filter 40D has air permeability and suppresses water from entering the inside of the occupant detection sensor 40 from the exhaust port 45.

When no pressure is applied to the detection unit 42, the pair of electrodes E1 and E2 are separated from each other, so that the occupant detection sensor 40 is in an OFF state in which no current flows. On the other hand, when pressure is applied to each of the first detection unit 42A and the second detection unit 42B, the pair of right electrodes E1 and E2 come into contact with each other, and the pair of left electrodes E1 and E2 come into contact with each other. 40 is an ON state in which a current flows. When the pair of electrodes E1 and E2 come into contact, the air between the pair of electrodes E1 and E2 is pushed out from the space between the pair of electrodes E1 and E2, passes through the exhaust groove 46C and the through hole 46B, and is exhaust port. It is discharged from 45 to the outside of the occupant detection sensor 40.

As shown in FIG. 6, the leaf spring member 50 is a plate-shaped spring that extends long in the left-right direction (the direction in which the base 41 and the detection unit 42 are lined up), and faces the occupant detection sensor 40 under the occupant detection sensor 40. And are arranged. The leaf spring member 50 has a pressing portion 51 on both the left and right sides and a connecting portion 52 that integrally connects the left and right pressing portions 51 (the first pressing portion 51A and the second pressing portion 51B).
The connecting portion 52 is a portion (base facing portion) facing the base 41 of the occupant detection sensor 40, and is a pair of first through holes 53 (through holes) communicating with the pair of sensor-side through holes 43, and an exhaust port 45. It has a second through hole 55 as an air flow path facing the air flow path.

The pressing unit 51 includes a first pressing unit 51A facing the first detecting unit 42A and a second pressing unit 51B facing the second detecting unit 42B. Each pressing portion 51 is provided with a through hole 56 as an opening facing the detecting portion 42. The through hole 56 has a substantially circular shape and is provided so as to face the detection unit 42 when the leaf spring member 50 and the occupant detection sensor 40 are viewed from below. Since the opening provided in the pressing portion 51 is the through hole 56, the rigidity of the leaf spring member 50 can be ensured as compared with the case where the opening has a notch shape, for example.

The main body 31 of the connecting member 30F has a mounting portion 34, facing portions 35 provided on both the left and right sides of the mounting portion 34, and a cushion support portion 36 provided so as to surround the mounting portion 34 and the facing portion 35. are doing.

The mounting portion 34 is a portion to which the base portion 41 of the occupant detection sensor 40 and the connecting portion 52 of the leaf spring member 50 are mounted. The mounting portions 34 are provided at positions facing the pair of sensor-side through holes 43 and the pair of first through holes 53, and are provided with two mounting holes 34A for mounting the base portion 41 and the connecting portion 52, and two mounting holes. It has an air vent hole 34B provided at a position facing the exhaust port 45 and the second through hole 55 between the 34A. Both the mounting hole 34A and the air bleeding hole 34B are provided so as to penetrate vertically. Further, as shown in FIG. 4B, the mounting portion 34 has an inclined surface 34C that inclines downward (in a direction away from the occupant side) from the front to the rear toward the center in the left-right direction of the rear end portion of the upper surface. have. The inclined surface 34C is a surface that guides the electric wire 44 extending from the occupant detection sensor 40 toward the lower side of the connecting member 30F. By having such an inclined surface 34C, it is possible to improve the maneuverability of the electric wire 44 and reduce the load applied to the electric wire 44 from the cushion member 60 when the occupant sits down.

As shown in FIG. 4A, the electric wire 44 is arranged under the pan frame 12, and an intermediate portion thereof is held by the clip 91. An intermediate portion of the electric wire 44 is attached to the second extending portion 12C by engaging the clip 91 with the through hole 12E formed in the second extending portion 12C. Since a gap is formed between the connecting member 30F and the second extending portion 12C, the claw portion of the clip 91 for attaching the electric wire 44 can be arranged by using this gap, so that the electric wire 44 is clipped 91. Can be easily attached to the pan frame 12 using the above. The electric wire itself may be arranged in the gap between the connecting member 30F and the second extending portion 12C. Further, the end portion of the electric wire 44 is connected to the connector 92 with a clip. The pan frame 12 has a third extension portion 12K extending substantially downward from the front end of the support portion 12A, and a fourth extension portion 12L extending forward from the front end of the third extension portion 12K. The end of the electric wire 44 is attached to the pan frame 12 by engaging the connector 92 with the through hole 12M formed in the fourth extending portion 12L.

Returning to FIG. 6, the facing portion 35 is a portion facing the detection unit 42, and has a first facing portion 35A facing the first detection unit 42A and a second facing portion 35B facing the second detection unit 42B. Includes. The portion of each facing portion 35 facing the detection portion 42 is provided with a convex portion 37 as a pressurizing portion that projects upward toward the detection unit 42.
The cushion support portion 36 is a portion of the edge of the main body portion 31. The connecting member 30F is integrally formed with the seat springs 20B and 20C so that the cushion support portion 36 covers the seat springs 20B and 20C (wire-shaped members).

As shown in FIG. 8, in the occupant detection sensor 40 and the leaf spring member 50, the clip 93 as a fixing member is inserted into the sensor side through hole 43 and the first through hole 53 and engages with the mounting hole 34A. It is fixed to the connecting member 30F. The occupant detection sensor 40 and the leaf spring member 50 are fixed to the connecting member 30F so that they are positioned on the connecting member 30F. Further, in a state where the occupant detection sensor 40 and the leaf spring member 50 are fixed to the connecting member 30F, the second through hole 55 and the air bleeding hole 34B communicate with each other, and the exhaust port 45 of the occupant detection sensor 40 is the second. It is arranged so as to face the through hole 55 and the air bleeding hole 34B.

In the seat cushion S1, the connecting member 30F (opposing member), the occupant detection sensor 40, and the leaf spring member 50 are arranged below the cushion member 60. The left and right detection portions 42 of the occupant detection sensor 40 are arranged between the cushion member 60 and the convex portions 37 (connecting member 30F) facing each other via the through hole 56 of the leaf spring member 50, respectively. ..

The mounting portion 34 of the connecting member 30F is provided so as to project above the facing portion 35 (cushion member 60 side), and a step 38 is formed between the mounting portion 34 and the facing portion 35. There is. On the other hand, the lower surface of the mounting portion 34 and the facing portion 35 is formed as a substantially flat surface. Therefore, the mounting portion 34 is formed so that the thickness in the vertical direction (direction facing the cushion member 60) is thicker than the thickness in the vertical direction of the facing portion 35. As a result, the rigidity of the mounting portion 34 of the connecting member 30F to which the occupant detection sensor 40 or the like is fixed can be ensured, and the occupant detection sensor 40 or the like can be stably mounted. The cushion support portion 36 is provided so that its upper portion projects upward from the upper surface of the mounting portion 34, and supports the cushion member 60. The convex portion 37 has a substantially spherical shape, and its diameter D1 (maximum diameter) is formed so as to be larger than the diameter D2 of the detection portion 42 of the occupant detection sensor 40.

The leaf spring member 50 is formed so that the length in the left-right direction is longer than that of the occupant detection sensor 40. Therefore, the end portion 50E on the lateral side (the detection portion 42 side of the leaf spring member 50) of the pressing portion 51 is located at a position farther from the base portion 41 (center of the occupant detection sensor 40) than the detection portion 42 in the left-right direction. Specifically, it is arranged at a position outside the detection unit 42. The through hole 56 provided in the leaf spring member 50 is formed so that its diameter D3 is larger than the diameter D2 of the detection unit 42. Further, the diameter D3 of the through hole 56 is formed to be larger than the diameter D1 of the convex portion 37. As a result, the convex portion 37 can easily enter the through hole 56.

The leaf spring member 50 is formed in a shape in which each pressing portion 51 (end portion facing the detection portion 42) smoothly curves upward from the inside to the outside in the left-right direction. Therefore, in the occupant detection sensor 40 arranged on the leaf spring member 50, the central portion in the left-right direction is fixed to the connecting member 30F via the connecting portion 52, and the left and right end portions are supported from below by the pressing portion 51. Therefore, when the occupant shown in FIG. 8 is not sitting, the detection unit 42 is curved upward from the inside to the outside in the left-right direction so as to be separated from the convex portion 37. The leaf spring member 50 may be formed in a shape in which the entire leaf spring member 50 is curved before being attached to the connecting member 30F, or the connecting portion 52 is flat and only the pressing portion 51 is curved. It may be formed in.

The leaf spring member 50 forms a gap between the cushion member 60 and the facing portion 35 by pressing the cushion member 60 toward the upper side. More specifically, the first pressing portion 51A presses the cushion member 60 upward to form a gap between the cushion member 60 and the first facing portion 35A, and the second pressing portion 51B cushions. By pressing the member 60 upward, a gap is formed between the cushion member 60 and the second facing portion 35B.

The occupant detection sensor 40 is in the OFF state because the detection unit 42 is not strongly pressed by the cushion member 60 because the leaf spring member 50 is provided with the through hole 56 when the occupant is not sitting.

The cushion member 60 of the seat cushion S1 used for the vehicle seat S includes a pad material 61 made of urethane foam and a seat material 62 made of a non-woven fabric. The seat material 62 has a pad material 61 due to contact with a seat spring 20 installed so as to face the seat material 62, a connecting member 30F arranged so as to face the seat material 62, a leaf spring member 50, and the like. It is provided to prevent damage, and is arranged so as to cover substantially the entire lower surface of the pad material 61.

As shown in FIG. 9, when the occupant sits on the vehicle seat S (seat cushion S1), the skin 70 and the cushion member 60 are pushed downward by the occupant's thigh T, so that the lower side of the cushion member 60 The surface presses the left and right detection portions 42 and the pressing portion 51 downward. Then, the left and right detection portions 42 are sandwiched between the cushion member 60, the facing portion 35 of the connecting member 30F, and more specifically, the convex portion 37 that has entered the through hole 56 of the leaf spring member 50. Pressure is applied from the convex portion 37 to the detection portion 42 between the cushion member 60 and the facing portion 35, and the pair of electrodes E1 and E2 (see FIG. 7) come into contact with each other. As a result, the occupant detection sensor 40 is turned on and detects that the occupant is sitting.

By providing the connecting member 30F with the convex portion 37 (pressurizing portion), in addition to the detection unit 42, the detection unit is sandwiched between the cushion member and the flat surface when the occupant sits down. Since the pressure applied increases, the pair of electrodes E1 and E2 can be brought into contact with each other more reliably. As a result, the occupant detection sensor 40 can be operated satisfactorily when the occupant sits down. On the other hand, since the convex portion 37 has a substantially spherical shape, it is possible to suppress that a large load is locally applied to the detection portion 42.

When the pair of electrodes E1 and E2 come into contact with each other, the air discharged from the exhaust port 45 of the occupant detection sensor 40 passes through the second through hole 55 and the air vent hole 34B and is discharged under the connecting member 30F. By having such a second through hole 55 and an air bleeding hole 34B, the air discharged from the occupant detection sensor 40 can be satisfactorily escaped. In particular, since the second through hole 55 and the air bleeding hole 34B are provided between the pair of first through holes 53 for fixing or the pair of mounting holes 34A, the occupant detection sensor 40 and the leaf spring member 50 are provided. When attached to the connecting member 30F, these can be brought into close contact with each other around the exhaust port 45, the second through hole 55, and the air bleeding hole 34B, so that the air discharged from the occupant detection sensor 40 can be released better.

According to the present embodiment described above, even when the elasticity of the cushion member 60 decreases due to aged deterioration or the like and the cushion member 60 is deformed so as to hang down to the facing portion 35 side, as shown in FIG. 8, the plate The spring member 50 can form a gap between the cushion member 60 and the facing portion 35. As a result, it is possible to suppress erroneous detection of the occupant detection sensor 40 due to the detection unit 42 being sandwiched between the cushion member 60 and the facing portion 35 when the occupant is not sitting.

Further, since the occupant detection sensor 40 and the leaf spring member 50 are positioned on the connecting member 30F (the same member), the positional accuracy of the occupant detection sensor 40 and the leaf spring member 50 can be improved. As a result, a gap can be satisfactorily formed at the position where the detection unit 42 is arranged between the cushion member 60 and the facing portion 35, and erroneous detection can be further suppressed.

Further, since the occupant detection sensor 40 and the leaf spring member 50 can be collectively attached to the connecting member 30F by the clip 93, the number of parts can be reduced and the position accuracy of the occupant detection sensor 40 and the leaf spring member 50 can be improved. It can be further improved and false detection can be further suppressed.

Further, since the end portion 50E of the leaf spring member 50 is arranged outside the detection portion 42 in the left-right direction, the entire portion overlapping the detection portion 42 of the cushion member 60 is moved upward by the leaf spring member 50 when viewed from above. Can be pressed toward. Also by this, a gap can be formed between the cushion member 60 and the facing portion 35 at the position where the detection portion 42 is arranged, so that erroneous detection can be further suppressed.

As shown in FIG. 9, when the occupant sits down, the detection unit 42 is sandwiched between the cushion member 60 and the convex portion 37 provided on the facing portion 35 to detect the occupant. The accuracy of detection by the occupant detection sensor 40 can be improved as compared with a configuration in which the occupant detection sensor 40 is sandwiched between the flat surfaces.

Further, since the diameter D1 of the convex portion 37 is larger than the diameter D2 of the detection unit 42, the convex portion 37 can stably contact the detection unit 42 and apply pressure to the detection unit 42 satisfactorily. The accuracy can be further improved.

On the other hand, as shown in FIG. 8, since the mounting portion 34 protrudes above the facing portion 35, it is difficult for the detection portion 42 to be loaded when the occupant is not sitting, so that a small load is applied to the cushion member 60. It is not detected that there is an occupant only by this, and the accuracy of detection can be further improved as a whole.

Further, since the step 38 is formed between the mounting portion 34 and the facing portion 35, the amount of movement (play) of the detecting portion 42 in the vertical direction can be secured, so that a small load is also applied to the cushion member 60. It is not detected that there is an occupant only by this, and the accuracy of detection can be further improved.

Further, since the occupant detection sensor 40 is curved so that the detection unit 42 is separated from the convex portion 37 when the occupant is not sitting, a space can be secured between the detection unit 42 and the convex portion 37. .. Even with this, it is not detected that there is an occupant even if a small load is applied to the cushion member 60, and the accuracy of detection can be further improved.

Further, since the cushion support portion 36 projects upward from the mounting portion 34, a space can be secured between the cushion member 60 and the mounting portion 34 or the facing portion 35 when the occupant is not sitting. As a result, it is not detected that there is an occupant even if a small load is applied to the cushion member 60, and the accuracy of detection can be further improved.

As shown in FIG. 4A, since the occupant detection sensor 40 is supported by the pan frame 12 via the connecting member 30F, the occupant detection sensor 40 can be stably supported with a simple configuration. As a result, the occupant detection sensor 40 can be operated stably, so that the accuracy of detection by the occupant detection sensor 40 can be improved.

Further, as shown in FIG. 5, since the holding portion 32A is arranged so as to sandwich the protruding portion 12D in a state where the connecting member 30F is supported by the pan frame 12, the position of the connecting member 30F can be stabilized. It is possible to support the occupant detection sensor 40 more stably.

Further, as shown in FIG. 6, since the connecting member 30F has a recess 33 capable of receiving the protrusion 12D, the sandwiching portion 32A and the recess 33 sandwich the protrusion 12D from the left and right to position the connecting member 30F. It can be made more stable and can support the occupant detection sensor 40 more stably.

As shown in FIG. 4A, since the connecting member 30F connecting the seat spring 20 is supported by the pan frame 12, excessive bending of the seat spring 20 can be suppressed. This makes it possible to improve the sitting comfort of the vehicle seat S.

Further, since the front end portion of the connecting member 30F is in contact with and supported by the support portion 12A and the rear end portion is arranged away from the second extending portion 12C, the seat spring 20 is suppressed from being excessively bent. The amount of bending of the seat spring 20 can be secured. This makes it possible to further improve the sitting comfort.

Further, as shown in FIG. 3, since the connecting member 30F connects the left and right extending portions 21 of the seat springs 20B and 20C, the distance between the left and right extending portions 21 can be specified. As a result, the amount of bending of the seat spring 20 can be adjusted, so that the sitting comfort can be further improved.

Further, since the connecting member 30F is provided at the center in the left-right direction, the connecting member 30F can receive the load in a well-balanced manner, and the sitting comfort can be further improved.

Further, since the two seat springs 20 arranged adjacent to each other are formed symmetrically, the seat springs 20 can be flexed in a well-balanced manner with the center in the left-right direction as a reference, further improving the sitting comfort. Can be made to.

Although one embodiment of the invention has been described above, the present invention is not limited to the above embodiment. The specific configuration can be appropriately changed as described below without departing from the spirit of the invention.

In the above embodiment, the diameter D1 (maximum diameter) of the convex portion 37 provided on the connecting member 30F is larger than the diameter D2 of the detection portion 42 of the occupant detection sensor 40, but the present invention is not limited to this. not. For example, as shown in FIG. 10, the diameter D1 (maximum diameter) of the convex portion 37 may be smaller than the diameter D2 of the detection unit 42. According to this, since it is possible to suppress the increase in diameter (larger size) of the convex portion 37, it is possible to make the connecting member 30F and the occupant detection sensor 40 more compact.

In the above embodiment, the convex portion 37 has a substantially spherical shape, but the present invention is not limited to this. For example, the convex portion may have a substantially cylindrical shape, and the corner portion may be chamfered into a curved surface shape.

In the above embodiment, a convex portion 37 integrally provided on the facing portion 35 is exemplified as a pressurizing portion that applies pressure to the detecting portion 42 between the cushion member 60 and the facing portion 35 when the occupant sits down. However, it is not limited to this. For example, the pressurizing portion is a disk-shaped foam elastic body arranged between the detection portion of the occupant detection sensor and the flat facing portion and attached to at least one of the occupant detection sensor and the facing portion. And so on.

In the above embodiment, as shown in FIG. 8, the upper portion of the seat spring 20 and the upper surface of the mounting portion 34 are arranged at substantially the same height position, but the present invention is not limited to this. For example, as shown in FIG. 11, the seat spring 20 (wire-shaped member) may be arranged so that its upper portion protrudes above the upper surface of the mounting portion 34 (cushion member 60 side). In this configuration, the cushion support portion 36 that covers the seat spring 20 is also arranged so that its upper portion protrudes above the upper surface of the mounting portion 34. Even with such a configuration, when the occupant is not sitting, a space can be secured between the cushion member 60 and the mounting portion 34 and the facing portion 35, so that the occupant detection (not shown) is performed only by applying a small load to the cushion member 60. The sensor does not detect the presence of an occupant, and the accuracy of detection can be improved. Further, since the cushion support portion 36 is provided so as to cover the seat spring 20, the rigidity of the connecting member 30F can be increased.

In the above embodiment, the occupant detection sensor 40 has a flat shape and is supported from below by the leaf spring member 50 so that the detection unit 42 is curved so as to be separated from the convex portion 37 when the occupant is not sitting. However, it is not limited to this. For example, as shown in FIG. 12A, the occupant detection sensor 40 itself moves from the inside to the outside in the left-right direction so that the detection unit 42 separates from the convex portion 37 in a state where the occupant is not sitting. , May be formed in a shape that curves toward the upper side. Further, as shown in FIG. 12B, in the occupant detection sensor 40, the left and right ends of the occupant detection sensor 40 are outward in the left-right direction with respect to the central portion so that the detection portion 42 is separated from the convex portion 37 when the occupant is not sitting. It may be formed in a shape that bends so as to extend diagonally upward. According to such a configuration, it is possible to secure a space between the detection unit 42 and the convex portion 37 when the occupant is not sitting, so that it is detected that the occupant is present even if a small load is applied to the cushion member (not shown). However, the accuracy of detection can be further improved.

In the above embodiment, the leaf spring member 50 creates a gap between the first pressing portion 51A that forms a gap between the cushion member 60 and the first facing portion 35A, and between the cushion member 60 and the second facing portion 35B. It was one spring member having a second pressing portion 51B to be formed, and a connecting portion 52 for integrally connecting the first pressing portion 51A and the second pressing portion 51B, but the present invention is not limited thereto. For example, a spring member that forms a gap between the cushion member and the first facing portion and a spring member that forms a gap between the cushion member and the second facing portion may be separately provided. According to the configuration in which the first pressing portion 51A and the second pressing portion 51B are integrally connected as in the above embodiment, the assembling property of the leaf spring member 50 is as compared with the configuration in which the spring members are separately provided. Can be improved.

In the above embodiment, the leaf spring member 50 has a second through hole 55 (through hole) as an air flow path facing the exhaust port 45 of the occupant detection sensor 40, but the present invention is not limited to this, for example. , The leaf spring member may have a groove-shaped air flow path. Further, in the above embodiment, the leaf spring member 50 has a through hole 56 as an opening facing the detection unit 42, but the present invention is not limited to this, and for example, the leaf spring member has a notch-shaped opening. You may have.

In the above embodiment, the clip 93 is exemplified as a fixing member for fixing the occupant detection sensor 40 and the leaf spring member 50 to the connecting member 30F, but the fixing member is not limited to this, and the fixing member is, for example, a screw or a pin. You may.

In the above embodiment, a part of the connecting member 30F (the front end portion of the main body portion 31 and the holding portion 32A) is in contact with the pan frame 12 and is supported by the pan frame 12, but is not limited thereto. not. For example, the connecting member may be entirely in contact with the pan frame and supported by the pan frame.

In the above embodiment, as the sensor support member that supports the occupant detection sensor 40, the connecting member 30F that connects the seat springs 20B and 20C is exemplified, but the sensor support member is not limited to this, and the sensor support member is a member that connects the seat springs. It may be a member other than. Similarly, in the above embodiment, the connecting member 30F is exemplified as the facing member arranged on the side opposite to the occupant side of the cushion member 60, but the facing member is not limited to this, and the facing member is a member for connecting the seat spring. It may be a member other than. Further, the sensor support member and the facing member may not be the same member but may be separate members.

In the above embodiment, the seat spring 20, the connecting member 30F, the occupant detection sensor 40, and the leaf spring member 50 exemplify the configuration provided in the seat cushion S1, but the present invention is not limited thereto. For example, the seat spring, the connecting member (sensor support member / facing member), the occupant detection sensor, and the leaf spring member (spring member) may be provided on the seat back. In this case, the front side corresponds to the "occupant side" and the rear side corresponds to the "opposite side to the occupant side".

In the above embodiment, the vehicle seat S used in an automobile is exemplified as the vehicle seat, but the vehicle seat is not limited to this, and the vehicle seat may be a vehicle other than an automobile, for example, a railroad vehicle, a ship, an aircraft, or the like. It may be the sheet used.

12 Pan frame 12A Support part 12C Second extension part 12D Protrusion part 20B Seat spring 20C Seat spring 21 Left and right extension part 30F Connecting member 31 Main body part 32 Covering part 32A Holding part 33 Recessed part 34C Inclined surface 40 Crew detection sensor 44 Wire 60 Cushion member F Seat frame S Vehicle seat

Claims (5)

A vehicle seat having a seat frame, a cushion member, and a skin.
An occupant detection sensor, which is placed under the cushion member and detects the presence or absence of an occupant,
A sensor support member that supports the occupant detection sensor from below,
A plurality of wire-shaped members erected on the seat frame are provided .
The occupant detection sensor is configured to detect an occupant by being sandwiched between the cushion member and the sensor support member when the occupant sits down.
The sensor support member is formed so as to connect the plurality of wire-shaped members to each other.
The sensor support member includes a surface that supports the occupant detection sensor from below and an inclined surface that is inclined with respect to a surface that supports the occupant detection sensor from below so that the sensor support member is located downward from the front to the rear. A vehicle seat characterized by having . The vehicle seat according to claim 1, wherein the rear end portion of the sensor support member is located below the front end portion of the sensor support member. The seat frame has a pair of side frames and a frame that connects the front ends of the pair of side frames.
The vehicle according to claim 1 or 2, wherein the rear end portion of the sensor support member is located behind the rear end portion of the frame connecting the front end portions of the pair of side frames. Sheet. The vehicle seat according to any one of claims 1 to 3, wherein the sensor support member extends in front of the occupant detection sensor. The sensor support member is claimed from claim 1, wherein the front and rear portions of the surface that supports the occupant detection sensor from below are located above the surface that supports the occupant detection sensor from below. The vehicle seat according to any one of the items 4.

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