JP2013035524A - Structure for mounting load measurement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for mounting a load measurement sensor, which can restrain an offset load from being applied to a load detecting unit of a sensor body.SOLUTION: In the structure for mounting the load measurement sensor 30, the load measurement sensor 30, which includes a sensor body 32 for detecting a load from a seat Z having a seat frame 1 and an extended shaft portion 31 extended from the sensor body 32, is mounted on mounting brackets 15 and 16 in a state in which the extended shaft portion 31 is set along a horizontal direction. A load input unit 42 for inputting the load into the sensor body 32 by abutting on the sensor body 32 is provided. The sensor body 32 has a load bearing surface 37a for bearing the load by abutting on the load input unit 42. Surface contact holding mechanism parts 37i and 42i, which can bring the load bearing surface 37a and the load input unit 42 into surface contact with each other when the load is input, are formed in a position in which the load bearing surface 37a and the load input unit 42 abut on each other.

Description

  The present invention relates to a load measuring sensor mounting structure, and more particularly to a load measuring sensor mounting structure in which the load measuring sensor is arranged in a horizontal direction.

For the purpose of improving occupant safety, comfort at the time of sitting, and the like, a technique for controlling the operation of peripheral devices of the vehicle seat according to the weight of the seated occupant has been proposed.
In such a technique, generally, in order to detect the weight of an occupant seated, a load measuring sensor is disposed below a vehicle seat on which the occupant is seated.

  The position of the load measuring sensor is generally arranged below the vehicle seat. For example, a slide rail provided to slide the vehicle seat in the front-rear direction and a seat constituting the vehicle seat Some are arranged between frames (Patent Document 1).

  In Patent Document 1, as shown in FIG. 22, an upper rail 112 (referred to as “slider” in Patent Document 1) slides on a lower rail 111 (described as “rail body” in Patent Document 1) attached to a vehicle floor. The load measurement sensor 130 (described as “load sensor” in Patent Document 1) is attached above the load measurement sensor 130, and the seat frame 101 is disposed above the load measurement sensor 130. A configuration is disclosed.

  As shown in FIG. 23, a shaft portion 131 (described as “male screw” in Patent Document 1) is provided to fix the load measuring sensor 130 to the seat frame 101. They are arranged so that the axial direction is the vertical direction. In recent years, a technique for reducing the height of a vehicle seat has been demanded in order to improve passengers' ability to get on and off and design. However, when the load measurement sensor 130 is attached in the above-described configuration, the seat frame 101 can perform load measurement. There is a disadvantage that the height of the sensor 130 is increased and the height of the vehicle seat is increased.

On the other hand, a technique has been proposed in which the axial direction of the shaft portion for attaching the load measuring sensor is arranged in the horizontal direction instead of the vertical direction (Patent Document 2).
In Patent Document 2, a load measuring sensor (described as “weight detection sensor” in Patent Document 2) is attached such that the axial direction is a horizontal direction so that it falls within the height range of the seat frame. Since the load measuring sensor is disposed on the vehicle seat, the height of the vehicle seat can be made lower than that of the technique of Patent Document 1.

Japanese Patent No. 4205028 JP 2010-42809 A

In the technique disclosed in Patent Document 2, the load measuring sensor is fixed so as to be bridged between the first bracket and the second bracket, so that the axial direction of the load measuring sensor is arranged horizontally.
In the conventional load measuring sensor, when the load detection unit of the sensor body is displaced by receiving a load from the seat, there is a possibility that an offset load is applied to the load detection unit from the load input member that inputs the load to the sensor body. No technology has been known that can solve the problem of uneven load.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a load measurement sensor mounting structure capable of suppressing an uneven load from being applied to a load detection portion of a sensor body. .

  According to the load measuring sensor mounting structure of the present invention, the object is to provide a load measuring sensor including a sensor main body for detecting a load from a seat having a seat frame, and an extending shaft portion extending from the sensor main body. The load measuring sensor mounting structure is attached to a mounting bracket in a state in which the extending shaft portion is along the horizontal direction, and a load input portion that contacts the sensor main body and inputs the load to the sensor main body. The sensor body has a load receiving surface that contacts the load input portion and receives the load, and when the load is input at a position where the load receiving surface and the load input portion contact each other This is solved by forming a surface contact holding mechanism that allows the load receiving surface and the load input portion to come into contact with each other.

  In this way, since the load receiving surface and the load input portion are in contact with each other, a surface contact holding mechanism portion that allows the load receiving surface and the load input portion to contact each other when a load is input is formed. The load input from the load input unit can be stably received by the surface contact holding mechanism unit, and it is possible to suppress an uneven load from being applied to the load input unit.

At this time, as in claim 2, a load transmitting member that transmits the load from the seat to the load input portion is provided, and the load receiving surface receives the load from the load input portion, and the load input Preferably, the load transmitting member is provided with a deformation follower that can be deformed based on the displacement of the load receiving surface.
As described above, since the load transmitting member includes the deformation follower that can be deformed based on the displacement of the load receiving surface, even if an uneven load is applied from the load input portion, the load transmitting member is deformed based on the displacement of the load receiving surface. The follower can be deformed to suppress the uneven load, and the input load can be received more stably.

At this time, as in claim 3, the surface contact holding mechanism portion includes a surface that contacts the load receiving surface of the load input portion, and a surface that contacts the load input portion of the load receiving surface. It is preferable that it is provided on at least one side and is composed of an inclined surface inclined with respect to the axial direction of the extending shaft portion.
Since it comprises in this way, when the load inputs, the contact area of the load input part and a load receiving surface increases, a surface contact is attained, and it becomes possible to receive a still more stable load.

At this time, it is preferable that the sensor main body includes a free end on one end side, and the surface contact holding mechanism is provided on the free end side.
Since it comprises in this way, it becomes possible to suppress an uneven load more efficiently.

At this time, as in claim 5, the sensor main body includes a free end on one end side, the inclined surface is provided on a surface that abuts on the load receiving surface of the load input portion, and the extending shaft portion Preferably, it is formed as a surface away from the sensor body from the free end side toward the opposite side of the free end along the axial direction.
Since it comprises in this way, when the load inputs, the contact area of the load input part and a load receiving surface increases, a surface contact is attained, and it becomes possible to receive a still more stable load.

At this time, as in claim 6, the sensor body includes a free end on one end side, and the inclined surface is provided on a surface that contacts the load input portion of the load receiving surface, and the extending shaft portion Preferably, it is formed as a surface away from the load input portion from the free end side toward the opposite side of the free end along the axial direction.
Since it comprises in this way, when the load inputs, the contact area of the load input part and a load receiving surface increases, a surface contact is attained, and it becomes possible to receive a still more stable load.

Further, according to a seventh aspect of the present invention, the load input surface that contacts the load receiving surface of the load input portion covers an end portion of the load receiving surface side of the load transmitting member that transmits the load from the seat. , Formed by a sliding member slidable with respect to the load receiving surface, and the thickness of the sliding member is substantially constant, and the end of the load transmitting surface on the load receiving surface side has the load detection It is preferable that an inclined surface inclined with respect to the part is provided.
Because it is configured in this way, the contact area between the load input part and the load receiving surface when a load is input is increased to enable surface contact and to receive a more stable load, while at the same time Since the surface is provided, it is possible to suppress a decrease in the rigidity of the sliding member.

The sliding member has a through hole that contacts the sensor body when the sliding member is disposed around the sensor body, and is adjacent to the sliding member. The sliding member includes a ring-shaped movement restricting portion that is disposed on the opposite side of the free end of the sliding member and is fitted to the sensor body, and the inner diameter of the movement restricting portion is the movement of the through hole of the sliding member. It is preferable that it is smaller than the inner diameter of the regulating portion.
Since it comprises in this way, it becomes possible to suppress that a sliding member deform | transforms into the movement control part side. As a result, the sliding member can input a stable load, and the uneven load can be suppressed.

According to the first aspect of the present invention, the surface contact holding mechanism portion that allows the load receiving surface and the load input portion to contact each other when the load is input is formed at a position where the load receiving surface and the load input portion abut. Therefore, the load input from the load input unit can be stably received by the surface contact holding mechanism unit, and it is possible to suppress an uneven load from being applied from the load input unit.
According to the second aspect of the present invention, the load transmitting member includes the deformation follow-up portion that can be deformed based on the displacement of the load receiving surface. Therefore, even when an unbalanced load is applied from the load input portion, Based on the displacement, the deformation follower can be deformed to suppress the uneven load, and the input load can be received more stably.
According to the invention of claim 3, when the load is input, the contact area between the load input portion and the load receiving surface is increased, and surface contact is possible, so that a more stable load can be received.
According to the invention of claim 4, it is possible to more efficiently suppress the uneven load.
According to the fifth aspect of the present invention, the contact area between the load input portion and the load receiving surface when a load is input is increased so that surface contact is possible, and a more stable load can be received.
According to the sixth aspect of the present invention, the contact area between the load input portion and the load receiving surface when a load is input is increased so that surface contact is possible, and a more stable load can be received.
According to the invention of claim 7, when the load is input, the contact area between the load input portion and the load receiving surface is increased to enable the surface contact and to receive a more stable load, while at the same time Since the surface is provided, it is possible to suppress a decrease in the rigidity of the sliding member.
According to invention of Claim 8, it becomes possible to suppress that a sliding member deform | transforms into the movement control part side. As a result, the sliding member can input a stable load, and the uneven load can be suppressed.

It is a perspective view of a vehicle seat. It is a perspective view of a seat frame. It is a perspective view which shows a sheet unit. It is an expanded view of a seat unit. It is sectional drawing of a load measurement sensor periphery. It is a perspective view which shows the inner surface of a side frame. It is a perspective view which shows the outer surface of a side frame. It is a perspective view which shows a rail mechanism. It is a figure which shows a mode that a mounting bracket and a side frame are connected. It is the figure which looked at the load measurement sensor of the state attached to the attachment position from the side. It is a component diagram which shows each of the components for sensor attachment. It is an enlarged view which shows the periphery of a load measurement sensor. It is an enlarged view around the hole of a side frame. It is a figure which shows the positional relationship between a load measurement sensor and S spring. It is a figure which shows the positional relationship between a load measurement sensor and a submarine suppression pipe. It is sectional drawing which shows the example of improvement of an extension shaft part. It is an enlarged view which shows the example of improvement of the attachment structure of a load measurement sensor. It is an enlarged view which shows other embodiment of the attachment structure of a load measurement sensor. It is a figure which shows other embodiment of a deformation | transformation follow-up part. It is a figure which shows the inclined surface of a sliding member. It is a figure which shows the inclined surface of a bush and a sliding member. It is a figure which shows the inclined surface of a load receiving surface. It is a fragmentary perspective view which shows the vehicle seat to which the attachment structure of the load measuring sensor which concerns on a prior art example was applied. It is sectional drawing of the attachment structure of the load measurement sensor which concerns on a prior art example.

  Hereinafter, a load measurement sensor mounting structure according to an embodiment of the present invention (this embodiment) will be described with reference to FIGS. Here, the load measurement sensor of the present embodiment measures the load when an occupant sits on the vehicle seat Z. In the following description, the load measurement sensor is mounted in a predetermined posture at a predetermined position. The attachment structure for attaching to will be described.

  FIG. 1 is a perspective view of a vehicle seat. FIG. 2 is a perspective view of the seat frame. FIG. 3 is a perspective view showing the seat unit. FIG. 4 is a development view of the seat unit. FIG. 5 is a diagram showing a load measurement sensor mounting structure, and is a cross-sectional view around the load measurement sensor. It is. 6A and 6B are perspective views showing the side frame, FIG. 6A shows the inner surface of the side frame, and FIG. 6B shows the outer surface of the side frame. FIG. 7 is a perspective view showing a rail mechanism. FIG. 8 is a diagram illustrating a state in which the mounting bracket and the side frame are coupled to each other. FIG. 9 is a side view of the load measurement sensor attached to the attachment position. FIG. 10 is a component diagram showing each of the sensor mounting components. FIG. 11 is an enlarged view showing the periphery of the load measuring sensor in FIG. FIG. 12 is an enlarged view around the hole of the side frame. FIG. 13 is a diagram illustrating a positional relationship between the load measurement sensor and the S spring. FIG. 14 is a diagram illustrating a positional relationship between the load measurement sensor and the submarine suppression pipe. FIG. 15 is a cross-sectional view showing an improved example of the extending shaft portion. FIG. 16 is an enlarged view showing an improved example of the mounting structure of the load measuring sensor. FIG. 17 is an enlarged view showing another embodiment of the load measuring sensor mounting structure. FIG. 18 is a diagram showing another embodiment of the deformation follower. FIG. 19 is a diagram illustrating an inclined surface of the sliding member. FIG. 20 is a diagram illustrating inclined surfaces of the bush and the sliding member. FIG. 21 is a diagram illustrating an inclined surface of the load receiving surface. FIG. 22 is a partial perspective view showing a vehicle seat to which a load measuring sensor mounting structure according to a conventional example is applied. FIG. 23 is a cross-sectional view of a load measuring sensor mounting structure according to a conventional example.

  In the figure, symbol FR indicates the front of the vehicle, symbol RR indicates the rear of the vehicle, and symbol UP indicates the upper side of the vehicle. Further, in the following description, the width direction of the vehicle seat Z is a direction corresponding to the left-right direction when facing the front of the vehicle.

  In the present embodiment, the load measuring sensor (hereinafter referred to as sensor 30) measures the load when an occupant is seated on the vehicle seat Z as described above. The measurement result is output as an electrical signal from the sensor 30 (specifically, the substrate in the substrate unit provided in the sensor body 32), and the output signal is received by a receiving unit (not shown). Thereafter, based on the received output signal, it is determined whether or not the occupant is seated on the vehicle seat Z and whether the occupant seated is an adult or a child. And the said determination result is used as data for controlling the expansion | deployment etc. of the airbag apparatus at the time of a vehicle collision, for example.

<Vehicle seat structure>
For the above purpose, the sensor 30 is attached to a predetermined position of the seat unit S (see FIG. 3). Hereinafter, in describing the mounting structure of the sensor 30, first, the structure of the seat unit S will be outlined.

  The seat unit S is fixed to a vehicle body floor of a vehicle main body (a portion of the vehicle excluding the seat unit), and includes a vehicle seat Z and a rail member 10. A vehicle seat Z shown in FIG. 1 is an example of a seat, and includes a seat frame F (see FIG. 2) and a cushion body as its skeleton. The seat frame F is formed of a metal material, and includes a seating frame 2 having side frames 2a at both ends in the left-right direction and a seat back frame 1 at the back side.

  Each side frame 2a constituting the seating frame 2 is a sheet metal member extending in the front-rear direction, and is connected to the seatback frame 1 at the rear end. Further, as shown in FIG. 4, the side frame 2a on one side in the left-right direction (left side) and the side frame 2a on the other side in the left-right direction (right side) are spaced apart in the left-right direction in a parallel state. The side frames 2a are connected to each other via a connection pipe 3 on the rear end side and a submarine suppression pipe 4 on the front end side.

  The submarine suppression pipe 4 is a pipe member that extends from one end in the width direction of the vehicle seat Z to the other end. While the width direction center part 4a and the width direction edge part 4b of the submarine suppression pipe 4 are located in parallel along the width direction, they are displaced in the front-rear direction. In this embodiment, the width direction center part 4a Is located on the rear side of the end 4b in the width direction (see, for example, FIG. 14). However, it is not limited to this, The structure where the width direction edge part 4b is located in the rear side rather than the width direction center part 4a may be sufficient. In addition, between both the width direction center part 4a and the width direction edge part 4b, the connection part 4c which connects between the both is provided, and the extension direction of the connection part 4c inclines with respect to the width direction.

  A plurality of S springs 6 (four in the case shown in FIG. 3) are arranged between the side frames 2a. The S spring 6 is a support spring that supports the cushion body from below, and extends in the front-rear direction while meandering. In addition, each S spring 6 is hung on a construction pan 5 whose front end is installed between the side frames 2a, and its rear end is fitted to the above-described connection pipe 3 (more specifically, the connection pipe. It is arranged between the side frames 2a by being hung on a substantially arc-shaped retaining member. A cushion body (not shown) is mounted on the installation pan 5 and the S spring 6. The structure of the side frame 2a will be described in detail later.

  A pair of rail members 10 are provided apart from each other in the left-right direction of the vehicle, and one (left side) rail member 10 and the other (right side) rail member 10 are spaced apart in the left-right direction in a parallel state. . Each rail member 10 has a lower rail 11 fixed to the vehicle body floor, and an upper rail 12 that engages with the lower rail 11 and can slide on the lower rail 11.

  Each of the lower rail 11 and the upper rail 12 as “rail members” is provided as a pair, and each extends in the front-rear direction. As shown in FIG. 4, the pair of upper rails 12 are arranged in parallel with each other at an interval in the left-right direction, and the upper rails 11 are connected by a slide lever 17.

  On the other hand, as shown in FIG. 4, the pair of lower rails 11 are arranged in parallel with each other at an interval in the left-right direction, and the lower rails 11 are connected by a member frame 14. In addition, a support bracket 13 is attached to the lower surface on the end side of each lower rail 11. When the support bracket 13 is fastened to the vehicle body floor, the lower rail 11 is fixed to the vehicle body floor.

  A vehicle seat Z is placed on each of the lower rails 11. More specifically, the upper rail 12 is slidably disposed on the lower rail 11, and mounting brackets 15 and 16 are fixed on the upper rail 12 with bolts 18 and nuts as “fixing members”. By connecting the side frames 2 a of the vehicle seat Z to the mounting brackets 15 and 16, the vehicle seat Z is fixed to each upper rail 12. As a result, the vehicle seat Z is placed on each of the lower rails 11. A sensor 30 (described later) is attached to the attachment brackets 15 and 16. In FIG. 4, the sensor mounting component 40 described below is omitted for simplification.

  In the state in which the vehicle seat Z is placed on each of the lower rails 11, the side frame 2a on one end side (left side) in the left-right direction is positioned above the lower rail 11 on one end side (left side) in the left-right direction. The side frame 2a on the other end side (right side) is located above the lower rail 11 on the other end side in the left-right direction (right side). Further, in a state where the vehicle seat Z is placed on each of the lower rails 11, each of the plurality of S springs 6 described above is positioned between the lower rails 11 in a state of being aligned in the left-right direction.

<Sensor structure>
Next, the sensor 30 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 5, the sensor 30 includes an extending shaft portion 31, a sensor main body 32, and a substrate unit 34 as a “conversion unit”. In the present embodiment, the extending shaft portion 31 is constituted by the end portion on the side where the male screw is formed, of the metal shaft body 33 having the male screw formed at one end portion. On the other hand, the sensor main body 32 is configured by a large-diameter portion (specifically, a step described later) formed in the shaft body and an outer cylinder body through which the shaft body is inserted. In addition, said shaft body 33 provided with the extended shaft part 31 is attached to the outer cylinder body which comprises the sensor main body 32, and is integrated with the said outer cylinder body.

  The extending shaft portion 31 is a bolt-shaped portion provided for attaching the sensor 30 to the sheet unit S, and extends from the side of the sensor main body 32. The extension shaft portion 31 has a male screw portion 31a formed at one axial end portion of the shaft body and an adjacent portion 31b adjacent to the male screw portion 31a in the axial direction. The portion corresponding to the thread of the male screw portion 31a and the adjacent portion 31b have the same diameter. In the present embodiment, the male screw portion 31a is formed on the extension shaft portion 31, but a female screw may be formed.

  The sensor body 32 is a main part of the sensor 30 that detects a load when an occupant sits on the vehicle seat Z and measures the load. The sensor main body 32 includes a positioning unit 35 for positioning the sensor 30 and a load detection unit 37 that is deformed to detect a load. The positioning portion 35 is a stepped portion adjacent to the adjacent portion 31b on the opposite side to the male screw portion 31a in the shaft body including the extended shaft portion 31. The step portion constituting the positioning portion 35 has a somewhat larger outer diameter than the male screw portion 31a and the adjacent portion 31b, and corresponds to a large diameter portion.

  The load detection part 37 is formed in the annular part located in the edge part by the side of an opening (the edge part by which the insertion part of the shaft body provided with the extension shaft part 31 is provided) among said outer cylinders. Yes. The load detection unit 37 corresponds to a deformed unit. When a load is applied to the load detection unit 37 along the radial direction of the annular portion (in other words, the radial direction of the extending shaft portion 31), the load detection unit 37 has a diameter. Deforms (displaces) to bend in the direction. The sensor body 32 detects the deformation amount of the load detection unit 37 by a strain sensor (not shown), and measures (determines) the magnitude of the load from the deformation amount.

  The sensor main body 32 is equipped with a substrate unit 34 that outputs the load measurement result as an electrical signal. The board unit 34 is provided with a connector part 34a for electrically connecting to a receiving part (not shown) that receives the electric signal, and a part (board) for outputting the electric signal as described above. In addition, a substrate housing case and the like are included (for example, see FIG. 14). The connector part 34a protrudes horizontally from the center position of the side surface of the board housing case.

  Further, the sensor main body 32 includes a portion (hereinafter referred to as an accommodation shaft portion 36) accommodated in the outer cylindrical body of the shaft body 33 provided with the extending shaft portion 31 as a constituent element. As shown in FIG. 5, in the axial direction of the shaft body, the housing shaft portion 36 has the same diameter portion 36a extending from the step portion side forming the positioning portion 35 with the same diameter, and the same diameter portion 36a side. And a different-diameter portion 36b that expands again on the base side. In addition, the outer diameter of the same diameter part 36a is slightly smaller than the inner diameter of the annular part in which the load detection part 37 is formed.

  As shown in FIG. 5, the sensor 30 configured as described above is attached so that the extending shaft portion 31 extends along the horizontal direction. In the state where the sensor 30 is attached at a predetermined attachment position, the annular portion of the sensor 30 where the load detection portion 37 is formed is inserted into the hole portion 21 formed in the side frame 2a.

  When an occupant sits on the vehicle seat Z, the load at that time is transmitted to the load detection unit 37 of the sensor main body 32 via the side frame 2a. More specifically, the side frame 2a is located outside the annular portion in the radial direction of the annular portion (the radial direction of the extending shaft portion 31), and is used to transmit the load to the load detecting portion 37. The detection unit 37 is pressed radially inward. Here, the site | part which the side frame 2a presses is the circumferential direction uppermost part among the said annular parts. That is, the load detection unit 37 of the present embodiment is the uppermost portion in the circumferential direction among the annular portions. That is, a region corresponding to the uppermost circumferential direction of the outer peripheral surface of the annular portion is the load receiving surface 37a, and the sensor body 32 is in a direction orthogonal to the load receiving surface 37a (specifically, downward in the vertical direction). Detect the load.

  In addition, the same diameter part 36a of the accommodating shaft part 36 whose outer diameter is slightly smaller than the inner diameter of the annular part is disposed on the radially inner side of the annular part (see FIG. 5). Therefore, when the load detecting portion 37 bends in the radial direction of the annular portion (downward in the vertical direction) due to the load when the occupant is seated on the vehicle seat Z, it is within the range until it comes into contact with the same diameter portion 36a. The amount of bending is regulated so that it will not bend excessively. That is, in the present embodiment, the same-diameter portion 36 a corresponds to a restriction portion that restricts the deformation amount when the load detection portion 37 is deformed, and restricts the deformation amount by coming into contact with the load detection portion 37.

  The same-diameter portion 36a as the restricting portion is disposed at a position on the load center point when the vehicle seat Z applies a load to the load detecting portion 37 via the side frame 2a in the axial direction of the extending shaft portion 31. Has been. Here, the load center point is a point where the load is concentrated most in the sensor body 32 when the sensor body 32 (specifically, the load detection unit 37) receives a load from the vehicle seat Z. In the present embodiment, the load center point exists in the above-described load receiving surface 37 a and is usually located at the center position of the load receiving surface 37 a in the axial direction of the extending shaft portion 31.

  By providing the same-diameter portion 36a as the restricting portion at the position as described above, the same-diameter portion 36a receives the portion corresponding to the load center point of the load detection unit 37, and as a result. Therefore, the load detector 37 is prevented from being excessively deformed due to an offset load or the like, so that the sensor 30 can stably measure the load.

  Moreover, in this embodiment, as shown in FIG. 5, the length of the same diameter part 36a in the axial direction of the extension shaft part 31 is larger than the length (thickness) of the side frame 2a in the same direction. . That is, in the axial direction, the same diameter part 36a exists in the range where the load detection part 37 is pressed by the side frame 2a. Therefore, the same-diameter portion 36a receives the load detection portion 37 over the entire range pressed from the side frame 2a, so that more stable load measurement can be performed.

<Sensor mounting structure>
As shown in FIG. 5, the sensor 30 described above functions as a member that connects the side frame 2 a and the mounting brackets 15, 16, and the sensor 30 is attached to a predetermined mounting position in a predetermined posture, so that the side The frame 2a is connected to the mounting brackets 15 and 16, and the vehicle seat Z is fixed to each upper rail 12. In other words, the sensor 30 is attached to the vehicle seat Z so as to straddle the side frame 2 a and the attachment brackets 15 and 16.

  Below, the attachment structure which attaches the sensor 30 is demonstrated. Here, since the vehicle seat Z of the present embodiment has a substantially bilaterally symmetric shape, only the configuration of one end side (left side) in the width direction of the vehicle seat Z will be described in the following description. .

  In the following description, one of the set of rail members (for example, the lower rail 11) is referred to as a first rail member, and the other is referred to as a second rail member. Here, the first rail member and the second rail member are relative concepts, and when one rail member is the first rail member, the other rail member (that is, along the width direction of the vehicle seat Z). For example, when the left (right) rail member is the first rail member, the right (left) rail member is the first rail member. It becomes a two-rail member.

  For convenience of explanation, in the width direction of the vehicle seat Z, the side where the second rail member is located when viewed from the first rail member is referred to as the inner side, and the side where the second rail member is located when viewed from the first rail member. The opposite side is called the outside.

  In describing the mounting structure of the sensor 30, the structures of the side frame 2a and the mounting brackets 15 and 16 will be described with reference to FIGS. 6A, 6B, and 7. FIG.

  First, the structure of the side frame 2a will be described. The side frame 2a is formed by processing a long sheet metal, and the front end portion 20 is bent inward to define the front end of the vehicle seat Z. In addition, circular hole portions 21 to which the sensors 30 are attached are respectively provided at positions somewhat rearward of the front end of the side frame 2a and positions forward of the rear end. In the hole portion 21, the annular portion of the sensor 30 in which the load detection portion 37 is formed is inserted. In the present embodiment, a bush 43 (see FIG. 8), which will be described later, is provided in order to increase the length of the portion through which the annular portion is inserted in the side frame 2a (the length in the axial direction of the extending shaft portion 31). It is fitted in the hole 21.

  As shown in FIGS. 6A and 6B, the predetermined region of the side frame 2a is recessed inward, and the other region protrudes outward. More specifically, in the side frame 2a, the connecting region 22 (that is, the rear end) as the “connecting portion” connected to the seat back frame 1 is located on the innermost side of the side frame 2a. (In other words, it is closest to the second rail member in the width direction of the vehicle seat Z). A region (hereinafter referred to as a rear attachment region 23) that is located in front of the connection region 22 and corresponds to a “projection” in which the rear hole portion 21 is formed (hereinafter, the rear attachment region 23) is somewhat more than the connection region 22. As shown in FIG. 6B, in particular, a portion located near the boundary with the connection region 22 protrudes further outward.

  On the other hand, a region (hereinafter referred to as a front mounting region 25) corresponding to a “protruding portion” that is located behind the region corresponding to the front end portion (front end region 24) of the side frame 2a and in which the front hole portion 21 is formed. , Located outside the front end region 24. Moreover, the front side attachment area | region 25 is located in the outer side rather than the connection area | region 22 located in the innermost side in the side frame 2a.

  In the side frame 2a, the lower portion 26a is recessed inward in an area (intermediate area 26) located between the front attachment area 25 and the rear attachment area 23 in the front-rear direction. On the other hand, in the upper part 26 b of the intermediate region 26, the rear adjacent portion 26 c adjacent to the rear attachment region 23 protrudes outward to the same extent as the rear attachment region 23 and is adjacent to the front attachment region 25. The portion 26d is recessed slightly inward from the front attachment region 25.

  As described above, in the present embodiment, when the outer surface of the above-described connection region 22 is used as the reference surface in the side frame 2a, the rear attachment region 23 and the front attachment region 25 in which the hole 21 is formed, that is, The region where the sensor 30 is attached protrudes outward from the reference plane.

  In other words, in the side frame 2a located on the first rail member side, the hole 21 is formed in a region farther from the second rail member than the connection region 22 in the width direction of the vehicle seat Z. . Furthermore, in the side frame 2a located on the first rail member side, the hole 21 is further away from the second rail member in the width direction of the vehicle seat Z in the two regions adjacent to each other in the side frame 2a. It can also be said that it is formed in the side region.

  In the present embodiment, the reference plane is also applied to a part of the region other than the rear attachment region 23 and the front attachment region 25 where the hole 21 is formed (for example, the rear adjacent portion 26c of the intermediate region 26). It was supposed to protrude outward. However, the present invention is not limited to this, and only the region in which the hole 21 is formed, that is, the region to which the sensor 30 is attached may protrude outward from the reference surface.

  Further, as shown in FIG. 6B, a projecting portion 23 a projecting in an inverted triangular shape is formed in the lower portion of the rear attachment region 23. Similarly, a projecting portion 25 a that projects in an inverted triangular shape is also formed in the lower portion of the front attachment region 25. That is, in the side frame 2a, the rear-side attachment region 23 and the front-side attachment region 25 are longer in the vertical direction than the other regions because of the overhang portions 23a and 25a. And the hole part 21 is formed in the overhang | projection parts 23a and 25a.

  Next, the mounting brackets 15 and 16 will be described. The mounting brackets 15 and 16 are separate from the upper rail 12 and extend along the front-rear direction of the vehicle seat Z. The mounting brackets 15 and 16 are fixed to the upper surface of the upper rail 12 by a bolt 18 which is an example of a fastening member. Yes.

  In the present embodiment, a plurality of mounting brackets 15 and 16 are attached in the longitudinal direction of the upper rail 12 (in other words, the front-rear direction of the vehicle seat Z). The sensor 30 is attached to each of the attachment brackets 15 and 16. That is, in this embodiment, a plurality of sensors 30 are provided at different positions in the front-rear direction of the vehicle seat Z. In particular, in the embodiment illustrated in the present specification, at each end in the width direction of the vehicle seat Z. The sensors 30 are respectively provided on the front side and the rear side of the vehicle seat Z (that is, a total of four sensors 30 are attached to the vehicle seat Z).

  The mounting brackets 15 and 16 and the mounting structure for mounting the load measuring sensor to the mounting brackets 15 and 16 are provided for each of the 30 parts. More specifically, a mounting bracket 15 is provided for the front sensor 30, and a mounting bracket 16 is provided for the rear sensor 30.

  The mounting bracket 15 for the front sensor 30 is different from the mounting bracket 30 for the rear sensor 30 in terms of the length in the longitudinal direction of the upper rail 12, but the basic structure is substantially the same. Therefore, only the structure of the mounting bracket 15 of the front sensor 30 will be described below.

  As shown in FIG. 7, the mounting bracket 15 is substantially U-shaped when viewed from the front (when viewed from the front), and the upper rail 12 is arranged such that the center in the width direction overlaps the center in the width direction of the upper rail 12. Fixed to the top surface. As described above, the mounting bracket 15 is fixed to the upper surface of the upper rail 12 by the bolt 18 as a fastening member. Here, a bolt hole (not shown) is formed in the bottom wall portion 50 of the mounting bracket 15 in order to insert the bolt 18. This bolt hole is a long hole (long hole) along the longitudinal direction of the upper rail 12 (the longitudinal direction of the vehicle seat Z).

  For this reason, when fixing the mounting bracket 15 on the upper rail 12, it is possible to move the mounting bracket 15 along the longitudinal direction of the upper rail 12 after inserting the bolt 18 into the bolt hole and temporarily assembling the nut. It is. Therefore, in this embodiment, the fixing position of the mounting bracket 15 in the upper rail 12 as a rail member can be adjusted along the longitudinal direction of the upper rail 12. As a result, the fixing position of the mounting bracket 15 can be adjusted easily and accurately.

  In addition, about said bolt hole, it is not restricted to a hole long along the longitudinal direction of the upper rail 12, For example, it should just be a size which can adjust the fixing position of the attachment bracket 15, If it is such a size, It may be a perfect circular hole.

Moreover, the bottom wall part 50 in which the volt | bolt 18 is inserted is provided with the extension part 50a extended along the front-back direction in the front-back direction edge part of the vehicle seat Z, as shown in FIG. The extending portion 50a extends at least forward or rearward from the front-rear direction end portion of the standing wall portion 51 described later.
And the volt | bolt 18 is arrange | positioned in the vicinity of the extension part 50a. More specifically, the bolt 18 is disposed at a position adjacent to the extending portion 50a in the front-rear direction.

  In this way, the bolts 18 can be firmly attached by being disposed at positions adjacent to the extending portions 50a. As a result, the mounting bracket 15 can be firmly attached to the upper rail 12.

  The mounting bracket 15 has a standing wall portion 51 that stands substantially vertically upward from an outer end portion of the bottom wall portion 50 in the width direction of the vehicle seat Z. In other words, the bottom wall portion 50 is a portion that intersects the standing wall portion 51 in the mounting bracket 15 and is in contact with the standing wall portion 51 at one end portion (outer end portion) in the width direction of the vehicle seat Z.

  The standing wall portion 51 has a substantially triangular shape and is formed from the front end to the rear end of the bottom wall portion 50. In addition, an insertion hole 52 into which the extended shaft portion 31 is inserted when the sensor 30 is attached is formed in a portion corresponding to the apex angle of the substantially triangular standing wall portion 51 as shown in FIG. Yes. The insertion hole 52 is a through-hole formed along the thickness direction of the mounting bracket 15, and thus the sensor 30 is mounted (particularly, the sensor 30 is positioned in the width direction of the vehicle seat Z). It is possible to confirm.

  Further, the mounting bracket 15 has an upper protruding wall 53 that protrudes upward from the inner end portion of the bottom wall portion 50 in the width direction of the vehicle seat Z. As described above, the upper protruding wall 53 is a bottom wall at the inner end of the bottom wall 50 in the width direction (that is, the other end opposite to the one end where the upright wall 51 is located). It is in contact with the portion 50, intersects the bottom wall portion 50, and is provided at a position facing the standing wall portion 51.

  By providing the mounting bracket 15 with the upper protruding wall 53, the rigidity of the mounting bracket 15 is improved. As a result, it is possible to increase the mounting rigidity of the sensor 30 (the rigidity of the portion where the sensor 30 is mounted and to support the sensor 30), and to improve the accuracy of load measurement by the sensor 30. Note that the upper protruding wall 53 according to the present embodiment intersects the bottom wall portion 50 substantially perpendicularly, but is not limited to this, for example, has an inclination that forms an obtuse angle with respect to the bottom wall portion 50. It may be an upper protruding wall 53 protruding so as to intersect.

  The upper projecting wall 53 is formed (extends) from the front end to the rear end of the bottom wall portion 50 in the front-rear direction of the vehicle seat Z, while the same position as the insertion hole 52 in the front-rear direction. The upper part of the part is cut away and removed. As described above, the upper protruding wall 53 includes the removal portion 54 at the same position as the insertion hole 52 in the front-rear direction.

  The side frame 2 a and the mounting brackets 15, 16 described above are connected by mounting the sensor 30. More specifically, as shown in FIG. 8, the vehicle seat Z is set to a set of rail members 10 (that is, the first frame member) so that the side frame 2 a is positioned inside the standing wall portion 51 of the mounting brackets 15 and 16. (1 rail member and 2nd rail member). At this time, the insertion hole 52 formed in the mounting brackets 15 and 16 and the hole 21 formed in the side frame 2a are overlapped. More specifically, the insertion hole 52 of the front mounting bracket 15 and the hole portion 21 of the front mounting region 25 of the side frame 2a are overlapped, and the rear of the insertion hole 52 of the rear mounting bracket 16 and the side frame 2a. The hole 21 of the side attachment region 23 is overlapped.

  In a state where the two holes (the insertion hole 52 and the hole portion 21) are overlapped, the sensor 30 is inserted into each of the two holes from the extending shaft portion 31 side. The sensor 30 is inserted until the positioning portion 35 of the sensor 30 comes into contact with the inner surface of the standing wall portion 51 of the mounting brackets 15 and 16. Accordingly, the sensor 30 is positioned in the width direction of the vehicle seat Z.

  When the sensor 30 is positioned, the annular portion of the sensor 30 in which the load detection portion 37 is formed comes into engagement with the hole portion 21 of the side frame 2a, and the extending shaft portion 31. The male screw portion 31a protrudes outward from the outer surface of the standing wall portion 51 of the mounting brackets 15 and 16, and the adjacent portion 31b fits into the insertion hole 52 of the mounting brackets 15 and 16. .

  After that, the nut 30 as the “fastening means” is screwed into the male screw portion 31 a protruding from the outer surface of the standing wall portion 51, so that the sensor 30 is attached at a predetermined attachment position. In such a state, the sensor 30 is in a posture in which the axial direction of the extending shaft portion 31 is along the horizontal direction. That is, in this embodiment, the sensor 30 is in a cantilevered state (one is fixed to the mounting brackets 15 and 16 and the other is not fixed). Attached to the end).

  In the present embodiment, the insertion hole 52 is provided at a position outside the maximum load position where the load is most applied in the axial direction of the extending shaft portion 31. Here, the maximum load position is a position corresponding to the aforementioned load center point. As a result, the sensor 30 is stably supported by the mounting brackets 15 and 16.

  Then, when an occupant sits on the vehicle seat Z with the sensor 30 disposed at the above position, the load is applied to the load detection unit 37 of the sensor 30 via the side frame 2a. Specifically, the load when the occupant is seated on the vehicle seat Z is a vertically downward load, and when this load occurs, the side frame 2a is inserted into the hole portion 21 (load). The portion where the detection part 37 is formed is pressed on the inner peripheral surface of the hole 21. Thereby, the load detection part 37 deform | transforms so that it may curve to the radial inside of the extension shaft part 31, and the magnitude | size of the said load is measured in the load detection part 37 based on the said deformation | transformation amount.

  As described above, when the sensor 30 is attached to the above position with the extending shaft portion 31 in the posture along the horizontal direction, the load measurement by the sensor 30 becomes possible. In other words, the attachment position of the sensor 30 is a position where the load measurement by the sensor 30 described above is possible, and specifically, is the position of the sensor 30 shown in FIG. In the present embodiment, the attachment position is located above the first rail member (that is, the lower rail 11 closer to the sensor 30 as viewed from the sensor 30).

  The mounting structure of the sensor 30 will be further described. The mounting brackets 15 and 16 are provided with an upper protruding wall 53 at the inner end in the width direction, and the upper protruding wall 53 has an insertion hole in the front-rear direction of the vehicle seat Z. A removal portion 54 is formed at the same position as 52. And in this embodiment, as shown in FIG. 9, the attachment position of the sensor 30 corresponds with the formation position of the removal part 54. As shown in FIG. With this configuration, in this embodiment, the sensor 30 can be easily attached.

  More specifically, the sensor 30 is attached from the inside of the mounting brackets 15 and 16, more specifically from the side where the upper protruding wall 53 is provided (that is, the overlapping insertion hole 52 and hole portion are overlapped). 21). On the other hand, the above-described removal unit 54 is provided at the same position as the sensor 30 in the front-rear direction. Here, the removal portion 54 is a space inside the upper protruding wall 53 (a space positioned on the opposite side of the standing wall portion 51 as viewed from the upper protruding wall 53 in the width direction of the vehicle seat Z). In order to expose the sensor 30, the upper protruding wall 53 is partially removed.

  Since the removal portion 54 is provided, the sensor 30 accesses the hole portion 21 through the removal portion 54 when attached. That is, since the upper protruding wall 53 does not exist in the path when the sensor 30 is moved from the inner side of the upper protruding wall 53 toward the mounting position, the sensor 30 can be mounted smoothly. In the present embodiment, the removal portion 54 is formed by cutting out the upper portion of the upper protruding wall 53 at the same position as the insertion hole 52 in the front-rear direction of the vehicle seat Z. However, the present invention is not limited to this. For example, a through hole (not shown) having a size sufficient for the sensor 30 to pass when the sensor 30 is moved toward the attachment position is formed in the upper protruding wall 53. It is good to be.

  Further, the set position of the bolt 18 for fixing the mounting brackets 15 and 16 to the upper surface of the upper rail 12 is a position away from the removal portion 54 in the front-rear direction. The fastening member (bolt 18) for fixing the mounting brackets 15 and 16 is set at a position where the sensor 30 is avoided in the front-rear direction (specifically, before and after the sensor 30). Thereby, as a result of the interference between the sensor 30 (strictly speaking, the sensor main body 32) and the bolt 18 being suppressed, it is possible to shift the mounting position of the sensor 30 further downward.

  Further, when the sensor 30 is mounted at the mounting position, the lower surface of the sensor 30 is as shown in FIG. 9 from the upper surface of the bolt 18 set on the upper surface of the first rail member (shown by a dotted line in FIG. 9). Is also located below. As a result, the space for mounting the sensor 30 can be made more compact.

  In this embodiment, when the insertion hole 52 formed in the mounting brackets 15 and 16 and the hole portion 21 formed in the side frame 2a are overlapped, the insertion hole 52 is formed as shown in FIG. The substantially triangular standing wall 51 and the substantially inverted triangular projecting portions 23a, 25a in which the holes 21 are formed are overlapped. As a result, it becomes easy to secure a space around the bolts 18 set before and after the sensor 30 and workability is improved. Further, by making the standing wall portion 51 into a substantially triangular shape and the projecting portions 23a and 25a into a substantially inverted triangular shape, the periphery of each joint portion (specifically, the portion where the insertion hole 52 or the hole portion 21 is formed) is cut. As a result, the weight can be further reduced and the sensor mounting state can be easily seen.

  As described above, the upper projecting wall 53 of the mounting brackets 15 and 16 is provided with a notch as the removal portion 54 at the same position as the sensor 30 in the front-rear direction of the vehicle seat Z. As a result, it becomes easy to overlap the standing wall portion 51 of the mounting brackets 15 and 16 and the overhang portions 23a and 25a of the side frame 2a. That is, by forming the removal portion 54 by cutting out the upper protruding wall 53, the sensor 30 can be easily attached and the assembly of the seat unit S (assembly of the vehicle seat Z to the rail member 10) is also facilitated. .

  By the way, as described above, when attaching the sensor 30, the sensor 30 is inserted into the two overlapped holes (the insertion hole 52 and the hole 21) from the extending shaft part 31 side, and the positioning part 35 of the sensor 30 is The sensor 30 is positioned in the width direction of the vehicle seat Z when it is inserted until it comes into contact with the standing wall portion 51 of the mounting brackets 15 and 16.

  On the other hand, when the sensor 30 is positioned in the width direction of the vehicle seat, the adjacent portion 31b of the extending shaft portion 31 is fitted in the insertion hole 52 of the mounting brackets 15 and 16, but the sensor 30 is extended. It is in a state in which it can rotate relative to the mounting brackets 15 and 16 around the shaft portion 31. When the sensor 30 rotates relative to the mounting brackets 15 and 16, the load detection unit 37 and the load receiving surface 37a move in the rotation direction, so that the load transmitted from the side frame 2a is appropriately received. Will not be able to.

  Therefore, in the present embodiment, the insertion hole 52 formed in the mounting brackets 15 and 16 is not a perfect circular hole, but has a shape in which one end in the radial direction is cut off, and the inner peripheral surface of the insertion hole 52 is formed. Some are flat. Also, the extending shaft portion 31 has a shape in which one end portion in the radial direction is cut off, and a part of the peripheral surface of the male screw portion 31a and the adjacent portion 31b is a flat surface. By adopting such a configuration, even when the sensor 30 rotates unintentionally relative to the mounting brackets 15 and 16, the edge portion of the cut portion of the extended shaft portion 31 is inserted. By contacting the part of the inner peripheral surface of the hole 52 that has been cut off to become a flat surface, the relative rotation of the sensor 30 is stopped, and the relative rotation of the sensor 30 can be suppressed within a predetermined rotation angle. Become.

<Sensor mounting parts>
In the state where the sensor 30 is mounted at the mounting position described above, the sensor 30 is set at the mounting position so that good load measurement can be performed around the sensor main body 32 (particularly, the annular portion where the load detection unit 37 is formed). A component (hereinafter referred to as a sensor mounting component 40) for disposition is provided (see FIG. 5). Hereinafter, each of the sensor mounting parts 40 will be described with reference to FIGS.

  As shown in FIG. 11, the sensor mounting component 40 includes a spacer 41 as a “movement limiting portion” or “movement limiting member”, a “load input portion”, or a “load input member” from the outside in the width direction of the vehicle seat Z. ”, A bush 43 as“ load transmitting portion ”or“ load transmitting member ”, and a washer 44 as“ movement restricting portion ”.

  The bush 43 serving as the “load transmitting portion” or “load transmitting member” is provided to transmit the load from the seat frame F provided on the vehicle seat Z to the sensor 30. The bush 43 is a member made of hot rolled mild steel plate (SPHC), and as shown in FIG. 10, a cylindrical portion 43a as a “small diameter portion” and a substantially rhombic flange portion 43b as a “large diameter portion”. Are adjacent to each other in the thickness direction. (In addition, in FIG. 11, in order to explain the cylindrical part 43a and the flange part 43b, the dotted line which divides | segments the bush 43 is shown.) That is, the bush 43 is a flange part from the axial one end side of the cylindrical part 43a. 43b is formed to extend outward in the radial direction. A through hole 43c that penetrates both the cylindrical portion 43a and the flange portion 43b is formed at the central position of the bush 43. The diameter of the through hole 43c is somewhat larger than the outer diameter of the annular portion of the sensor 30 on which the load detection portion 37 is formed. Regarding the cylindrical portion 43a, the thickness is substantially equal to the thickness of the side frame 2a (specifically, the rear attachment region 23 and the front attachment region 25), and the outer diameter is substantially equal to the diameter of the hole 21. ing.

Further, the thickness of the flange 43b is the width of the front mounting area 25 (or the rear mounting area 23) provided in the side frame 2a protruding in the seat width direction (more specifically, than the connecting area 22). It is formed so as to be smaller than the width swelled to the outside of the sheet width. Furthermore, the outer diameter of the collar portion 43b is formed so as to fit in the front-rear direction within the range of the front attachment region 25 (or the rear attachment region 23) when the vehicle seat Z is viewed from the side. Yes.
With the above-described configuration, when the bush 43 is attached to the side frame 2a, the flange portion 43b of the bush 43 is formed on the bulged portion (the recess on the inner side in the seat width direction) of the front attachment region 25 (or the rear attachment region 23). Since it is included, there is no need to increase the overall width of the seat in order to attach the bush 43. As a result, the bush 43 can be attached in a compact manner.

  The bush 43 formed so that the cylindrical portion 43a and the flange portion 43b are adjacent to each other is disposed such that the flange portion 43b is located on the inner side in the sheet width direction than the cylindrical portion 43a. By adopting such a configuration, the side frame 2a is disposed on the outer side in the seat width direction by the thickness of the flange portion 43b. Therefore, the members disposed on the inner side in the seat width direction of the side frame 2a, etc. It becomes easy to secure a space for attaching (for example, a harness or the like).

  In FIG. 11, the configuration in which the flange portion 43b is disposed on the inner side in the sheet width direction than the cylindrical portion 43a has been illustrated and described, but the positional relationship between the cylindrical portion 43a and the flange portion 43b may be reversed. . In other words, the collar portion 43b may be disposed so as to be located on the outer side in the sheet width direction with respect to the cylindrical portion 43a. By adopting such a configuration, the side frame 2a is arranged on the inner side in the seat width direction by the thickness of the flange portion 43b, and therefore other members arranged on the outer side in the seat width direction of the side frame 2a. It becomes easy to secure the space for attaching. As a result, interference between other members and the seat frame can be suppressed, and load detection accuracy can be improved.

  The bush 43 having the above-described shape is joined to the side frame 2a by projection welding in a state where the cylindrical portion 43a is fitted in the hole 21 of the side frame 2a. Then, the sensor 30 is inserted into the through-hole 43c of the bush 43 joined to the side frame 2a, and the sensor 30 is arranged on the radially outer side of the annular portion of the sensor 30 where the load detection unit 37 is formed, that is, on the side frame 2a. The bush 43 is positioned at the end of the position where the sensor body 32 is pressed.

  With the above configuration, when the side frame 2a presses the above-described annular portion in order to transmit a load when an occupant is seated on the vehicle seat Z, the side frame 2a corresponds to the thickness of the flange portion 43b of the bush 43, It becomes possible to press in a larger area. That is, the bush 43 is a load transmission member for widening the pressing area when the side frame 2a presses the annular portion.

  In other words, the load transmitting portion constituted by the bush 43 has a load transmitting direction (in the present embodiment, the vertical direction), and the end portion on the sensor body 32 side (that is, the portion constituting the through hole 43c) is the load transmitting portion. It is formed so that the axial length of the extending shaft portion 31 is larger than the end portion located on the opposite side in the direction (that is, the outer peripheral end portion of the cylindrical portion 43a of the bush 43). That is, of the load transmitting portion, an end portion on the load measuring sensor (sensor body) side is provided with an enlarged portion formed with a large axial width.

  More specifically, the load transmitting portion is configured by a bush 43 attached to an end portion (hole portion 21) of the side frame 2a at a position where the sensor main body 32 is pressed. And the plate | board thickness of the bush 43 is formed so that the plate | board thickness of the part located in the sensor main body 32 side is thicker than the plate | board thickness of the part located in the side frame 2a side. More specifically, the plate thickness in the width direction of the vehicle seat Z on the sensor body 32 side of the bush 43 is formed larger than the plate thickness in the width direction on the side frame 2 (seat frame F) side. .

  With the above-described configuration, the bush 43 constituting the load transmitting portion functions to widen the pressing area when transmitting the load to the sensor main body 32, and as a result, the load can be stably transmitted to the sensor 30. . Therefore, the load detection accuracy can be further improved.

  In this embodiment, as shown in FIG. 12, the bush 43 has a longitudinal direction of the flange portion 43 b as an extending portion extending from the cylindrical portion 43 a in the longitudinal direction of the side frame 2 a (in other words, a vehicle seat. It is joined to the side frame 2a along the front-back direction of Z). Thereby, compared with the case where the bush 43 is joined so that the longitudinal direction of the flange portion 43b is orthogonal to the longitudinal direction of the side frame 2a, the space for joining the bush 43 (specifically, the projecting portion 23a, (A height of 25a) can be suppressed.

  Further, as shown in FIG. 11, the length (thickness) of the bush 43 in the axial direction of the extending shaft portion 31 is larger than the length in the axial direction of the same-diameter portion 36a as the restricting portion described above. . The bush 43 is provided such that both ends of the bush 43 in the axial direction are positioned inside both ends of the same-diameter portion 36a (regulating portion) in the axial direction. With the above configuration, even if the pressing range by the side frame 2a is expanded by the bush 43, the same-diameter portion 36a receives the load detection unit 37 over the entire expanded pressing range. Therefore, more stable load measurement can be performed while obtaining the effect of providing the bush 43.

  Further, at least a part of the flange portion 43b is located below the upper surface of the bolt 18 (indicated by a dotted line in FIG. 9) that fixes the mounting brackets 15 and 16 to the upper surface of the upper rail 12. As a result, the space for mounting the sensor 30 can be made more compact.

  Further, the radially outer portion (the lower end surface of the bush 43 in FIG. 11) of the joint surface between the cylindrical portion 43 a and the side frame 2 a of the bush 43 is located on the radially inner side of the extending shaft portion 31 with respect to the substrate unit 34. It is arranged. Furthermore, among the joint surfaces of the cylindrical portion 43a of the bush 43 and the side frame 2a, the radially outer end (in FIG. 11, the lower end surface of the bush 43) is the radially outer end of the spacer 41 (FIG. 11). , The lower end surface of the spacer 41 is disposed radially outward.

  As shown in FIG. 5, the bush 43 and the side frame 2a are fixed only by a welded portion 43d at the upper end of the surface where the flange portion 43b and the side frame 2a abut. Therefore, the side frame 2a is fixed to the bush 43 by the welded portion 43d at the upper end of the surface in contact with the flange portion 43b, but the opposite side of the flange portion 43b is the outer diameter surface of the cylindrical portion 43a and the side frame 2a. The mating surface with the hole portion 21 is formed as a deformation follow-up portion 43e that is not mutually fixed. In the deformation follow-up portion 43e, the mating surface of the outer diameter surface of the cylindrical portion 43a and the hole portion 21 of the side frame 2a can be contacted and separated, and when the load from the seat Z is input, the deformation follow-up portion The portion 43e can be bent or deformed. Therefore, when the load is input, the deformation follow-up unit 43e is deformed based on the deformation of the load detection unit 37, so that a more stable load can be received, and the uneven load can be suppressed.

In the present embodiment, the mating surface of the cylindrical portion 43a and the side frame 2a is configured as the deformation follow-up portion 43e. However, the present invention is not limited to this, and as illustrated in FIG. A notch may be provided on the surface of the side frame 2a on the free end 37b side, and this may be used as the deformation follower 2b.
The deformation follower 2b is formed of a notch formed horizontally on the surface of the side frame 2a on the free end 37b side perpendicular to the direction in which the load is applied. The deformation follower 2 b is formed above the upper end of the sliding member 42.
When the load from the seat Z is input, the deformation follower 2b can bend or deform the surface on the free end 37b side of the side frame 2a in the vertical direction due to the notch. Therefore, when the load is input, the deformation follow-up unit 2b is deformed based on the deformation of the load detection unit 37, so that a more stable load can be received, and the uneven load can be suppressed.
The effect of suppressing the unbalanced load by the deformation follow-up portions 43e and 2b is the so-called cantilever as in this embodiment in which the load measurement sensor is fixed at both ends and the load measurement sensor is fixed only at one end. However, in the cantilever configuration, an uneven load is easily applied, and thus the effect of suppressing the uneven load by the deformation follow-up portions 43e and 2b is particularly remarkable.
A load measuring sensor 30 including a sensor main body 32 for detecting a load from the seat Z having the seat frame 1 and an extending shaft portion 31 extending from the sensor main body 32 as in the present embodiment is extended. In the cantilever configuration in which the output shaft portion 31 is in the horizontal direction and is attached to the mounting brackets 15 and 16 only at one end side of the load measurement sensor 30, the fastening portion is one place. Workability is improved.

  The sliding member 42 as a “load input portion” or “load input member” is provided to abut the sensor 30 and input a load from the seat frame F provided on the vehicle seat Z to the sensor 30. In other words, the sliding member 42 is a contact member that contacts the sensor 30. Further, the sliding member 42 is slidable in order to facilitate sliding with respect to the sensor 30 along the axial direction of the extending shaft portion 31 when a load from the side frame 2a is applied. It is formed of a resin member with good properties. Further, the “load input portion” can be configured not by being attached to the side frame 2 a as the sliding member 42 but also by resin coating the side frame 2 a.

  More specifically, the sliding member 42 is a ring-shaped member made of ethylene resin, and the radial direction of the annular portion in which the load detecting portion 37 is formed (in other words, the radial direction of the extending shaft portion 31). ) Between the annular portion and the bush 43. More specifically, the sliding member 42 includes a cylindrical fitting cylinder portion 42b that fits into the through hole 43c of the bush 43, and a “first flange portion that is adjacent to one end portion of the fitting cylinder portion 42b. And the other end side flange part 42c as a “second flange part” adjacent to the other end part of the fitting tube part 42b. In a state where the fitting tube portion 42b is passed through the through hole 43c of the bush 43, the one end side flange portion 42a and the other end side flange portion 42c are in a state in which the bush 43 and the side frame 2a are sandwiched therebetween. (See FIG. 11). That is, the sliding member 42 is formed wider than the side frame 2a in the seat width direction. In the present embodiment, the one end side flange portion 42a has a smaller diameter than the other end side flange portion 42c. Thus, the rigidity of the sliding member 42 improves because the sliding member 42 is provided with the one end side collar part 42a and the other end side collar part 42c as a flange part.

Further, the sliding member 42 has a through-hole 42d penetrating the one end side flange portion 42a, the fitting cylinder portion 42b, and the other end side flange portion 42c in the thickness direction. The through hole 42d is slightly larger than the outer diameter of the annular portion of the sensor 30 where the load detection portion 37 is formed. When the sensor 30 is attached, the annular portion is fitted into the through hole 42d with a slight gap provided between the through hole 42d of the sliding member 42 and the annular portion. In the present embodiment, in the axial direction of the extending shaft portion 31, the sliding member 42 is arranged such that the one end side flange portion 42a is farther from the tip of the extending shaft portion 31 than the other end side flange portion 42c. It is attached.
Thus, since the cross section of the sliding member 42 is formed in a U shape, it can be easily attached to the bush 43.

The sliding member 42 is preferably attached by the following procedure.
First, the sliding member 42 provided with the one end side flange 42a and the fitting cylinder portion 42b (the other end side flange 42c is not formed) is attached to the bush 43. At this time, the one end side flange portion 42 a is attached to the side where the sensor main body 32 is provided in the axial direction of the extending shaft portion 31. In addition, this one end side collar part 42a and the bush 43 may be integrally molded.
Next, after the bush 43 is inserted into the hole 21 provided in the side frame 2a and attached, the end opposite to the side provided with the one end side flange 42a is bent outward in the radial direction. In this way, the other end side flange 42c is formed.

  The other end side flange 42c formed by bending a part of the sliding member 42 after attaching the sliding member 42 to the hole portion 21 has a slightly reduced shape and dimensional stability. Since the one end side flange portion 42a on the sensor body 32 side can be formed (installed), the shape and dimensional accuracy of the portion of the sliding member 42 disposed on the substrate unit 34 side can be increased. As a result, the load detection accuracy can be improved.

  The outer diameter of the cylindrical portion 43a of the bush 43 described above is formed to be slightly larger than the outer diameters of the one end side flange portion 42a and the other end side flange portion 42c of the sliding member 42. Thus, by forming the outer diameter of the cylindrical portion 43a of the bush 43 larger than the outer diameters of the one end side flange portion 42a and the other end side flange portion 42c of the sliding member 42, the one end side flange portion 42a and the other end portion are formed. Since the outer diameter end portion of the side flange portion 42c does not contact the boundary portion between the bush 43 and the hole portion 21 of the side frame 2a, the bush 43 is firmly attached to the side frame 2a.

  When the side frame 2 a presses the load detection unit 37 of the sensor body 32, the sliding member 42 having the above-described configuration is arranged between the side frame 2 a (strictly, the bush 43) and the load detection unit 37 in the radial direction. In contact with the load detector 37. In this sense, it can be said that the sliding member 42 is a load input member that finally inputs the load transmitted via the side frame 2 a and the bush 43 to the load detection unit 37. That is, when transmitting the load transmitted from the side frame 2 a to the load detection unit 37, the sliding member 42 as a load input member contacts the load detection unit 37 and directly presses the load detection unit 37. .

  The sliding member 42 is disposed away from other members (specifically, a spacer 41 and a washer 44 described later) disposed adjacent to each other in the thickness direction. That is, since the sliding member 42 is disposed with a gap from other members in the axial direction of the extending shaft portion 31, the sliding member 42 is pivoted when a load is applied from the side frame 2a. It can move in the direction. More specifically, when the load transmitted from the side frame 2a to the sensor 30 is deformed so that the load detecting portion 37 of the sensor 30 bends inward in the radial direction, the sliding member 42 detects the load along with the deformation. It slides to the outside (in other words, to the mounting brackets 15 and 16 side) along the annular portion where the portion 37 is formed. That is, the sliding member 42 is a movable portion (movable member) that slides on the outer peripheral surface of the annular portion following the deformation of the load detection portion 37.

  In this manner, the sliding member 42 slides outward (in other words, toward the extending shaft portion 31), so that the sensor 30 is located in the vicinity of the mounting brackets 15 and 16 (that is, a fixed portion). The load can be received. As a result, since the load from the side frame 2a is stably input to the sensor 30, the detection accuracy is improved.

  Further, the sliding member 42 is disposed on the inner side in the sheet width direction with respect to the positioning unit 35, and at a position closer to the direction in which the substrate unit 34 is disposed than the end portion of the load detecting unit 37 in the outer direction of the sheet width. Arranged. That is, the sliding member 42 is disposed in the axial direction at a position closer to the side where the substrate unit 34 is attached than the end (free end 37b) of the load detection unit 37 that is not fixed. With such a configuration, the sliding member 42 stably abuts against the load receiving surface 37a of the sensor 30, so that load detection accuracy can be improved. In addition, it is possible to suppress the application of a biased load to the sliding member 42.

  Moreover, in the sliding member 42, as shown in FIG. 16, the end part 42ax provided in the outer peripheral side may be chamfered in the surface facing the washer 44 mentioned later. By chamfering, damage to the washer 44 and the sliding member 42 can be suppressed even when the sliding member 42 is in contact with the washer 44 while being inclined. Note that the chamfering means forming a configuration in which corners are cut off, a configuration with roundness, or the like.

  In addition, the contact surface of the sliding member 42 with the load detection unit 37 (specifically, the region facing the load receiving surface 37a in the inner peripheral surface of the through hole 42d, the “load input surface” (Corresponding) has a spread in the axial direction of the extending shaft portion 31. Here, of the contact surfaces, one end in the axial direction is on one end side of the one end and the other end in the width direction of the vehicle seat Z together with one end in the axial direction of the above-described same-diameter portion 36a (regulating portion). To position. On the other hand, the other end in the axial direction of the contact surface is located on the other end side of the one end and the other end in the width direction of the vehicle seat Z together with the other end in the axial direction of the same diameter portion 36a.

  And the one end in the axial direction of the said contact surface is located inside the one end in the axial direction of the same diameter part 36a (in other words, it is separated from the width direction one end of the vehicle seat Z). Thereby, when the side frame 2a presses the load detection part 37 via the sliding member 42, the same diameter part 36a which is a control part receives the load detection part 37, and also the sliding member 42 slid. In addition, it is possible to continue receiving the load detection unit 37 stably.

  Further, the other end in the axial direction of the contact surface is located outside the other end in the axial direction of the same diameter portion 36a (in other words, away from the other end in the width direction of the vehicle seat Z). . In other words, in the present embodiment, the contact surface is within the range where the same-diameter portion 36a serving as the restricting portion exists in the width direction of the vehicle seat Z. Thus, the load detection unit 37 can accurately detect the load (appropriately receive the load) while being regulated by the same-diameter portion 36a.

As shown in FIG. 19, the inner wall surface of the through-hole 42d of the sliding member 42, which contacts the load receiving surface 37a when a load is applied, is free end along the axial direction of the same-diameter portion 36a. You may form as the inclined surface 42i which goes away from the load detection part 37 as it goes to the reverse side of the free end 37b from 37b side.
By configuring in this way, the contact area between the load receiving surface 37a and the load receiving surface 37a of the inner peripheral surface of the through hole 42d of the sliding member 42 and the load receiving surface 37a can be increased during load input. The load input surface and the load receiving surface 37a can receive a more stable load.
When the inclined surface 42i is formed, the sliding member 42 has a thin thin portion 42a 'at the boundary between the one end side flange portion 42a and the fitting cylinder portion 42b, and the other end side flange portion 42c and the fitting cylinder portion. The boundary part with 42b becomes the thick part 42c '.

In the example of FIG. 19, the position that is the inner wall surface of the through hole 43 c of the bush 43 and faces the load receiving surface 37 a is formed parallel to the axis of the same diameter portion 36 a, but is shown in FIG. 20. Thus, it may be formed as an inclined surface 43i that moves away from the load detection unit 37 as it goes from the free end 37b side to the opposite side of the free end 37b along the axial direction of the same diameter portion 36a.
At this time, the sliding member 42 is formed in a shape along the shape of the through hole 43 c of the bush 43.
With this configuration, the load input surface that faces the load receiving surface 37a in the inner peripheral surface of the through hole 42d of the sliding member 42 at the time of load input while keeping the plate thickness of the sliding member 42 constant. The contact area with the load receiving surface 37a can be increased, and the load input surface and the load receiving surface 37a can receive a more stable load. Further, since the thickness of the sliding member 42 is constant, the rigidity of the sliding member 42 can be ensured.

Furthermore, in the example of FIGS. 19 and 20, the position of the inner wall surface of the through hole 42d of the sliding member 42 that contacts the load receiving surface 37a when a load is applied is in the axial direction of the same diameter portion 36a. 21 is formed as an inclined surface 42i that moves away from the load detector 37 as it goes from the free end 37b side to the opposite side of the free end 37b. Instead of forming the inclined surface 42i on the sliding member 42, it is shown in FIG. As described above, the load receiving surface 37a may be formed with the inclined surface 37i that is moved away from the sliding member 42 as it is separated from the free end 37b side in the axial direction of the same diameter portion 36a.
Moreover, you may comprise so that both the inclined surface 42i of FIG. 19, FIG. 20 or both of the inclined surface 42i and the inclined surface 43i, and the inclined surface 37i of FIG.
The effect of receiving a stable load and the effect of suppressing the unbalanced load by the surface contact holding mechanism portion composed of at least one of the inclined surface 42i or the inclined surface 42i and the inclined surface 43i, and the inclined surface 37i can In the case of a so-called cantilever configuration that is fixed on the side, and in the case of a so-called cantilever configuration such as the present embodiment in which the load measuring sensor is fixed only on one end side, Since the uneven load is easily applied, the effect of receiving a stable load by the surface contact holding mechanism and the effect of suppressing the uneven load are particularly remarkable.
19 to 21, the surface contact holding mechanism is provided on the free end 37b side.

  19 to 21, the inner diameter of the washer 44 is formed smaller than the inner diameter of the sliding member 42 on the washer 44 side. Thereby, deformation of the sliding member 42 can be suppressed. In particular, in the case of FIG. 19, since there is a high possibility that the sliding member 42 is deformed toward the washer 44, if the inner diameter of the washer 44 is smaller than the inner diameter of the sliding member 42 on the washer 44 side, The deformation suppressing ability of the moving member 42 is effectively exhibited.

  The washer 44 as the “movement restricting portion” is a ring member made of a steel plate (specifically, SUS630). The washer 44 is fitted to the annular portion of the sensor 30 in which the load detection unit 37 is formed in a state where the sensor 30 is mounted at the mounting position described above. As shown in FIG. The sliding member 42 is located on the inner side in the sheet width direction with a slight gap between the sliding member 42 and the sliding member 42. That is, in the axial direction of the extending shaft portion 31, the washer 44 is disposed adjacent to the sliding member 42 inside the sliding member 42. Further, the washer 44 is located on the outer side in the sheet width direction of the substrate unit 34 with a gap between the washer 44 and the substrate unit 34 provided in the sensor 30. As described above, the washer 44 and the substrate unit 34 are arranged apart from each other, so that when the sliding member 42 moves to the washer 44 side, the washer 44 can be inclined to the substrate unit 34 side. 44 can serve as a buffer material to protect the substrate unit 34.

  The washer 44 restricts the sliding member 42 from excessively moving inward (that is, to the side opposite to the mounting brackets 15 and 16 side) at the above-described arrangement position. That is, the washer 44 functions as a movement restricting member, and restricts the sliding member 42 from moving inward from the position where the washer 44 is disposed.

  In the present embodiment, as shown in FIG. 11, the inner end of the same-diameter portion 36 a that is the restricting portion (in other words, the end opposite to the mounting bracket 15, 16 side in the axial direction of the extending shaft portion 31). ) Is closer to the mounting brackets 15 and 16 than the washer 44 (that is, located outside). Thereby, the length (length in the axial direction) of the same-diameter portion 36a to be secured for restricting the deformation amount of the load detection portion 37 is equal to the movable range of the sliding member 42, that is, the arrangement of the washer 44. The length to the position is sufficient, and it is possible to suppress the same-diameter portion 36a from becoming unnecessarily large.

  The washer 44 has an inner peripheral end disposed radially inward from the bottom surface of the substrate unit 34 provided in the sensor 30 (that is, the surface that contacts the load detection unit 37 of the sensor body 32). The end portion is formed in such a size as to be radially outward from the bottom surface of the substrate unit 34. That is, the washer 44 extends to the outside of the bottom surface of the substrate unit 34 in the radial direction when the sensor 30 is attached. In other words, the washer 44 is formed on the radially outer side (from the radially inner side to the outer side) than the bottom surface of the substrate unit 34. Therefore, the washer 44 exhibits a function of suppressing the sliding member 42 from moving inward in the axial direction of the extending shaft portion 31 and interfering with the substrate unit 34 at the above arrangement position.

  Further, the outer diameter of the washer 44 is formed larger than the outer diameter of the one end side flange 42a of the sliding member 42 described above. That is, the washer 44 extends to the outside in the radial direction from the outer diameter of the one end side flange 42 a of the sliding member 42. As described above, by forming the washer 44 to have an outer diameter larger than that of the sliding member 42, even if the sliding member 42 slides along the axial direction, the washer 44 can reliably suppress the movement thereof. it can. Further, it is possible to suppress a load from being applied locally to the sliding member 42.

  Further, the washer 44 is from the top surface of the substrate unit 34 (the surface opposite to the surface that contacts the load detecting portion 37, that is, the surface disposed on the radially outer side of the extending shaft portion 31, the outer end surface). Is also provided to the outside in the radial direction of the extending shaft portion 31. As described above, the washer 44 is provided radially inward from the radially outer surface of the substrate unit 34, so that the washer 44 is accommodated radially inward of the substrate unit 34. Therefore, it can suppress that the structure provided in order to fix the sensor 30 to a sheet | seat increases in a height direction and the front-back direction.

As described above, the bottom wall portion 50 is attached to the upper rail 12 by the bolt 18 and the nut (fixing member). At least a part of the washer 44 fixes the mounting brackets 15 and 16 and the upper rail 12. For this purpose, the bolt 18 is provided below the upper end of the bolt 18.
By disposing at least a part of the washer 44 below the upper end of the bolt 18, it is possible to prevent the configuration for fixing the sensor 30 to the seat from increasing in size in the height direction.

  In the present embodiment, the washer 44 is configured separately from the sensor 30 (sensor body 32). However, for example, the washer 44 may be formed integrally with the above-described annular portion. By forming the washer 44 integrally, the number of components can be reduced, and the sensor 30 can be easily attached.

  The spacer 41 as the “movement restriction portion” or “movement restriction member” is a cylindrical member made of a hot-rolled steel plate, and is attached in the state where the sensor 30 is attached to the attachment position as shown in FIG. It arrange | positions in the clearance gap between the standing wall part 51 of the brackets 15 and 16, and the sliding member 42, and adjoins the clearance gap between the sliding members 42 in the width direction of the vehicle seat Z. . A circular hole 41 a is formed in the central portion of the spacer 41, and the diameter thereof is slightly larger than the diameter of the stepped portion that forms the positioning portion 35 in the sensor 30.

  The spacer 41 is formed thicker than the plate thickness of the steel plate constituting the side frame 2a. In addition, when the spacer 41 is not formed integrally with the mounting brackets 15 and 16 but is formed separately, the spacer 41 is formed thicker than the thickness of the steel plate constituting the mounting brackets 15 and 16. The spacer 41 is formed so that the plate thickness is thinner than that of the bush 43.

  The spacer 41 having the above shape is joined to the inner surface of the standing wall portion 51 of the mounting brackets 15 and 16 by projection welding so that the circular hole 41a and the insertion hole 52 overlap in a coaxial circle. When the extension shaft portion 31 is inserted into the insertion hole 52 when attaching the sensor 30, the extension shaft portion 31 is guided into the insertion hole 52 through the circular hole 41 a of the spacer 41. Further, when the positioning portion 35 of the sensor 30 abuts against the standing wall portion 51 of the mounting brackets 15 and 16 and the sensor 30 is positioned in the width direction of the vehicle seat Z, the spacer 41 is, as shown in FIG. It comes to be located outside the positioning portion 35 in the radial direction of the extending shaft portion 31.

  The spacer 41 set as described above functions as a stopper that restricts the sliding member 42 from excessively moving outward in the axial direction of the extending shaft portion 31. More specifically, in the axial direction of the extending shaft portion 31, the sliding member 42 is positioned outside the annular portion where the load detecting portion 37 is formed in the radial direction of the extending shaft portion 31. When moving to the outside, the spacer 41 restricts the sliding member 42 from dropping out of the annular portion.

  The spacer 41 extends to the outside in the radial direction from the other end side flange portion 42 c provided in the sliding member 42. That is, the outer diameter of the spacer 41 is formed larger than the outer diameter of the other end side flange portion 42 c provided in the sliding member 42. With this configuration, when the sliding member 42 abuts against the spacer 41, the entire surface of the other end side flange 42c of the sliding member 42 can abut against the spacer 41. Therefore, the abutting area is wide. Become. Therefore, the spacer 41 can stably hold down the other end side flange portion 42c, and can suppress an uneven load on the sliding member 42.

  In the present embodiment, the thickness of the spacer 41 is relatively large, and when the sensor 30 is inserted into the insertion hole 52 until the positioning portion 35 comes into contact with the standing wall portion 51 of the mounting brackets 15 and 16, FIG. As described above, the end portion located inside in the thickness direction of the spacer 41 (that is, the end portion of the spacer 41 on the sliding member 42 side in the width direction of the vehicle seat Z) is in the axial direction of the extension shaft portion 31. The free end of the annular portion of the sensor 30 where the load detection unit 37 is formed (that is, the end of the load detection unit 37 on the side of the spacer 41 in the axial direction of the extending shaft 31). Become.

  In other words, the end portion on the inner side in the thickness direction of the spacer 41 and the free end portion of the annular portion are the same virtual plane (the symbol VS in FIG. 11) having the axial direction of the extending shaft portion 31 as the normal direction. It is overlapped with the above. With such a positional relationship, it is possible to suppress an uneven load from being applied to the free end portion of the annular portion (the end portion on the spacer 41 side in the axial direction of the extension shaft portion 31 of the load detection portion 37). become.

  Further, in a state where the sensor 30 is attached to the attachment brackets 15 and 16, the spacer 41 has an end surface (free end 37 b) on the outer side in the sheet width direction of the load detection portion 37 of the sensor 30 and a radial direction (extension) of the sensor 30. You may arrange | position so that it may not overlap on the virtual plane (symbol VS of FIG. 11) of the axial part 31 (direction orthogonal to the axial direction). By attaching the spacer 41 with such a configuration, it is possible to prevent the spacer 41 from interfering with the load detection unit 37 and reducing the load detection accuracy when the load detection unit 37 is deformed by receiving a load. .

  Further, as described above, the standing wall portion 51 of the mounting brackets 15 and 16 is formed so as to be separated from the load detection portion 37 in the axial direction, but the spacer 41 is disposed at a position so as to cover this gap. Is done. As described above, the spacer 41 covers the gap between the standing wall portion 51 and the load detection portion 37, so that foreign matter enters between the load detection portion 37 and the same diameter portion 36 a of the housing shaft portion 36. Can be suppressed.

  If foreign matter enters between the load detecting portion 37 and the same-diameter portion 36a of the accommodating shaft portion 36, the foreign matter interferes when the sliding member 42 is pushed down by the load from the seat, and the sensor 30 applies an accurate load. It becomes impossible to measure. On the other hand, by adopting a configuration in which the spacer 41 covers the gap between the standing wall portion 51 and the load detection portion 37, the entry of foreign matter is suppressed, and as a result, the load detection error by the sensor 30 can be suppressed. it can.

The spacer 41 is disposed at a position overlapping the front attachment region 25 (or the rear attachment region 23) when the vehicle seat Z is viewed from the side. That is, the spacer 41 is disposed at a position overlapping the front attachment region 25 (or the rear attachment region 23) in the sheet width direction. In other words, the spacer 41 is provided within the range of the front attachment region 25 (or the rear attachment region 23).
With the above configuration, the side frame 2a (more specifically, the front attachment region 25 and the rear attachment region 23) and the standing wall portion 51 of the attachment brackets 15 and 16 provided on the outer side in the seat width direction of the side frame 2a This is preferable without increasing the thickness of the spacer 41.

  Further, as described above, the sensor 30 is attached to the mounting brackets 15 and 16 by screwing the nut 39 into the extension shaft portion 31. And the spacer 41 is formed in the position and magnitude | size which overlap with this nut 39 in an axial direction, as shown in FIG. As described above, the nut 39 and the spacer 41 overlap each other in the axial direction, so that the nut 39 and the spacer 41 are disposed to face each other via the upright wall portions 51 of the mounting brackets 15 and 16, so The sensor 30 can be fixed to the mounting brackets 15 and 16.

  In the present embodiment, the spacer 41 is provided separately from the sensor 30 (sensor body 32), the mounting brackets 15 and 16, and the like. For example, the spacer 41 is integrated with the standing wall 51 of the mounting brackets 15 and 16. May be formed. More specifically, a part of the standing wall portion 51 may be formed so as to bulge toward the sensor body 32 side. By forming the spacer 41 integrally, the number of components can be reduced, and the sensor 30 can be easily attached.

  In the spacer 41, as shown in FIG. 16, the end portions 41b and 41c in the radial direction of the surface on which the sliding member 42 is provided may be chamfered. By chamfering, it is possible to prevent the sliding member 42 and the spacer 41 from being damaged even when the sliding member 42 is in contact with the spacer 41 while being inclined. Note that the chamfering means forming a configuration in which corners are cut off, a configuration with roundness, or the like.

<Other embodiments of sensor mounting parts>
Hereinafter, another embodiment of the sensor mounting component will be described with reference to FIG. In addition, about the member which is common in the said embodiment, it shows with the same code | symbol and the detailed description is abbreviate | omitted.

The present embodiment is characterized in that the spacer 41 and the washer 44 described in the above embodiment are not provided, but an E-ring 45 is provided.
The E-ring 45 is an annular member made of a metal material, and is attached to the load detection unit 37 of the sensor main body 32. More specifically, the E-ring 45 is attached to the sensor body 32 so that a groove is provided on the outer periphery of the annular portion provided with the load detection unit 37 and is fitted into the groove.

  The E-ring 45 is provided to limit the range in which the side frame 2 a moves along the axial direction of the extending shaft portion 31, and the sliding member 42 is provided between the side frame 2 a and the E-ring 45. Is provided. In other words, the sliding member 42 is attached to the side frame 2a, and when the sliding member 42 moves to the extension shaft portion 31 side by the E ring 45 attached to the load detection portion 37 of the sensor 30. The amount of movement is limited.

  The outer diameters of the one end side collar part 42 a and the other end side collar part 42 c of the sliding member 42 are formed larger than the outer diameter of the E ring 45. Furthermore, the outer diameter of the other end side flange 42c disposed on the side with which the E-ring 45 abuts is larger than the outer diameter of the one end side flange 42a. With such a configuration, when the sliding member 42 comes into contact with the E-ring 45, it comes into contact with the E-ring 45 more stably, so that the load detection accuracy can be improved.

  Further, in the present embodiment, the radially outer end portions of the one end side flange portion 42a and the other end side flange portion 42c of the sliding member 42 (in FIG. 17, the outer circumferences of the one end side flange portion 42a and the other end side flange portion 42c). The end portions are disposed radially inward of the top surface of the substrate unit 34 attached to the sensor body 32 (that is, the surface in contact with the load detection unit 37), and radially inward of the substrate unit 34. It is formed to fit.

<Positional relationship between sensor and vehicle seat Z>
Hereinafter, the mounting position of the sensor 30 described above will be described in more detail, and the positional relationship between the sensor 30 and the vehicle seat Z (including the sensor mounting component 40) will be described with reference to FIGS. This will be described with reference to FIG.

  As described in the section “Sensor mounting structure”, the mounting position of the sensor 30 is located above the first rail member (the lower rail 11 closer to the sensor 30 as viewed from the sensor 30). When the sensor 30 is attached to the attachment position, the sensor main body 32 of the sensor 30 (strictly, the portion of the sensor main body 32 located on the inner side of the load detection unit 37) It is located between the side frames 2a in the direction (in other words, between the first rail member and the second rail member). For example, as shown in FIG. 5, the substrate unit 34 provided in the sensor 30 is positioned inside the side frame 2 a.

  In the present embodiment, when the vehicle seat Z is placed on the first rail member and the second rail member, when the sensor 30 is attached to the attachment position, the load input portion in the sensor main body 32 is provided. However, it is arrange | positioned in the position away from the 2nd rail member rather than the center of the 1st rail member in the width direction of the vehicle seat Z. Here, the load input portion is an area formed in the sensor main body 32 and receiving a load transmitted from the vehicle seat Z (specifically, the side frame 2a). In the present embodiment, the load receiving surface 37a. Corresponds to the load input section.

  That is, in the present embodiment, as shown in FIG. 5, in the state where the sensor 30 is attached to the attachment position, the load receiving surface 37 a serving as a load input portion is centered in the width direction of the lower rail 11 as the first rail member ( It is located outside (indicated by symbol L in FIG. 5). Due to such a positional relationship, the sensor 30 is less likely to interfere with a member inside the seat (a member located between the rail members, for example, the S spring 6 or a harness (not shown)). Can be achieved satisfactorily.

  The load receiving surface 37a, which is a load input portion, has a width (spread) in the width direction of the vehicle seat Z. And in this embodiment, as shown in FIG. 5, the edge of the width direction outer side of the load receiving surface 37a is located outside the center of the width direction of the lower rail 11 as a 1st rail member. In other words, the end of the load receiving surface 37a on the side where the first rail member is positioned in the width direction is arranged at a position farther from the second rail member than the center of the first rail member in the width direction.

  In particular, in the present embodiment, the center in the width direction of the load receiving surface 37a is located outside the center of the first rail member (in the width direction, it is farther from the second rail member than the center of the first rail member). Is placed in the position). Moreover, the end on the inner side in the width direction of the load receiving surface 37a is also located outside the center of the first rail member (in the width direction, it is farther from the second rail member than the center of the first rail member). Is placed in position). Due to the positional relationship as described above, the effect of suppressing interference between the sensor 30 and the members inside the sheet is more effectively exhibited.

  Further, in the present embodiment, as shown in FIG. 5, the sensor main body 32 is accommodated between both ends in the width direction of the lower rail 11 in a state where the sensor 30 is attached to the attachment position. That is, when the sensor 30 on the first rail member side is attached to the attachment position, the sensor main body 32 is more in the width direction of the vehicle seat Z than the end of the first rail member on the side where the second rail member is located. And it will be arranged in the position away from the 2nd rail member.

  As described above, since the sensor main body 32 is accommodated between both ends in the width direction of the lower rail 11, the sensor 30 can be attached by effectively using the space on the lower rail 11, so that the vehicle seat Z can be made more compact. It becomes possible to do.

  Further, since the sensor main body 32 is accommodated between the width direction ends of the lower rail 11, the board unit 34 provided on the sensor main body 32 is also located between the width direction ends of the lower rail 11. Accordingly, when the sensor 30 is attached to the attachment position, the connector portion 34a provided in the board unit 34 is positioned at the inner end in the width direction of the first rail member (the second rail member It is arranged on the outer side (position away from the second rail member) from the end on the side where it is positioned. Thereby, interference with the connector part 34a and the member inside a sheet | seat comes to be suppressed, For example, it becomes possible to connect the harness now to the connector part 34a smoothly.

  The sensor 30 is attached to the attachment position in the width direction of the vehicle seat Z more than the S spring 6 (the closest S spring among the plurality of S springs 6 arranged in the width direction; the same applies hereinafter). In other words, it is farther from the second rail member than the S spring 6. Thereby, as described above, it is possible to effectively suppress interference between the sensor 30 and the S spring 6.

  Furthermore, for the purpose of more effectively suppressing the interference between the sensor 30 and the S spring 6, in the present embodiment, as shown in FIG. 13, as shown in FIG. The sensor 30 is arrange | positioned in the same position as the position where the 2nd bending part 6b is arrange | positioned among the bending parts 6a and the 2nd bending part 6b. Here, the first bending portion 6a is curved so as to approach the first rail member in the width direction of the vehicle seat Z when viewed from the sensor 30 mounted on the first rail member in the S spring 6. It is a part that. The second bending portion 6b is a portion that is curved so as to approach the second rail member in the width direction of the vehicle seat Z when viewed from the sensor 30 attached on the first rail member.

  With the above arrangement, the sensor 30 and the S spring 6 can be separated from each other, and interference between the sensor 30 and the S spring 6 can be more effectively suppressed. In the present embodiment, in order to more effectively suppress the interference between the sensor 30 and the S spring 6, the mounting position of the sensor 30 and the S spring in the vertical direction (the height direction of the vehicle seat Z). 6 are different from each other.

  Further, as described above, the sensor 30 is attached to a region (specifically, the rear attachment region 23 and the front attachment region 25) protruding outward in the side frame 2a. Thereby, the attachment position of the sensor 30 can be further shifted outward in the width direction of the vehicle seat Z, and interference between the sensor 30 and a member inside the seat can be more effectively suppressed.

  In the present embodiment, when the vehicle seat Z is mounted on the first rail member and the second rail member and the sensor 30 is attached to the attachment position, the sensor 30 extends as shown in FIG. In a state where the shaft portion 31 is along the width direction of the vehicle seat, the shaft portion 31 is located at the same position as the width direction central portion 4a of the submarine suppression pipe 4 in the front-rear direction of the vehicle seat Z.

  In other words, when the sensor 30 is attached to the attachment position, the central portion 4a in the width direction of the submarine suppression pipe 4 is disposed at a position where the sensor 30 exists in the front-rear direction. On the other hand, the width direction end portion 4 b (the end portion on the side where the sensor 30 is located) of the submarine suppression pipe 4 wraps around the front of the sensor 30 in the front-rear direction and is arranged along the extended shaft portion 31. When the positional relationship between the sensor 30 and the submarine suppression pipe 4 satisfies the above positional relationship, it is possible to suppress the interference with the sensor 30 and provide the submarine suppression pipe 4.

  In the present embodiment, the end 4b in the width direction of the submarine suppression pipe 4 wraps around the front of the sensor 30 in the front-rear direction of the vehicle seat Z. However, the present invention is not limited to this. The width direction end portion 4b may wrap around the sensor 30 in the front-rear direction.

  Further, when the sensor 30 is attached to the attachment position, the substrate unit 34 provided in the sensor 30 comes to be located inside the side frame 2a. That is, the substrate in the substrate unit 34 is located on the opposite side of the side of the side frame 2a from the side on which the mounting brackets 15 and 16 are located in the axial direction of the extending shaft portion 31. In such a state, the distance between the substrate and the side frame 2a (in other words, the distance between the substrate unit 34 and the side frame 2a) is larger than the distance between the side frame 2a and the mounting brackets 15 and 16. Thereby, the contact between the substrate and the side frame 2a is suppressed, and the attachment position of the sensor 30 is shifted to the outside, so that the vehicle seat Z can be made more compact.

Next, the positional relationship between the sensor 30 and the sensor mounting component 40 will be described.
When the sensor 30 is mounted at the mounting position, the sliding member 42 is disposed on the inner side of the outer end of the load detection unit 37 (that is, the end on the mounting brackets 15 and 16 side in the axial direction of the extending shaft portion 31). (In other words, it is arranged at a position farther from the mounting brackets 15 and 16). That is, in this embodiment, the sliding member 42 is not hung on the outer end of the load detection unit 37 in a state where the sensor 30 is attached to the attachment position. Therefore, it is possible to confirm the state near the outer end of the load detection unit 37 (such as the presence or absence of foreign matter).

  As described above, in this embodiment, the inner end of the spacer 41 in the thickness direction is approaching the outer end of the load detection unit 37, but the state near the outer end of the load detection unit 37 is confirmed. In order to facilitate this, the inner end in the thickness direction of the spacer 41 may be located outside the outer end of the load detection unit 37.

  In addition, the vehicle seat Z is placed on the first rail member (the lower rail 11 on the one end side in the width direction) and the second rail member (the lower rail 11 on the other end side in the width direction), and the sensor 30 is attached to the attachment position. In the state, the same-diameter portion 36a serving as the restricting portion is disposed at a position farther from the second rail member than the center in the width direction of the first rail member. Accordingly, the sensor 30 (specifically, the load detection unit 37) is further arranged on the outer side, and interference between the member inside the seat and the sensor 30 can be more effectively suppressed.

<Improved extension shaft>
In the above-described embodiment, the axial section of the extending shaft portion 31 is a perfect circle. However, in order to prevent the sensor 30 from rotating relative to the mounting brackets 15 and 16, the following modes are used. It is good.

  As another means for suppressing the relative rotation of the sensor 30, as shown in FIG. 15, it is conceivable to provide a protruding portion that protrudes radially outward from the outer periphery of the shaft portion body on the shaft portion body of the extending shaft portion 31. . Here, the shaft portion main body is a portion of the extended shaft portion 31 excluding the convex portion, and in the present embodiment, is the adjacent portion 31b adjacent to the male screw portion 31a.

  The above means for suppressing the relative rotation of the sensor 30 will be described in detail. A plurality of convex portions are provided on the outer periphery of the shaft portion main body of the extending shaft portion 31 at different positions in the circumferential direction of the extending shaft portion 31. In this embodiment, the two convex portions 31c and 31d are provided.

  On the other hand, concave portions 52a and 52b corresponding to the two convex portions 31c and 31d are formed on the inner peripheral surface of the insertion hole 52, and the convex portions 31c and 31d are engaged with the corresponding concave portions 52a and 52b. The extending shaft portion 31 is inserted into the insertion hole 52. As a result, when the sensor 30 rotates relative to the mounting brackets 15 and 16 around the extension shaft portion 31 in a state where the extension shaft portion 31 is inserted into the insertion hole 52, the convex portions 31c, 31 d is locked to one side surface of the recesses 52 a and 52 b formed on the inner peripheral surface of the insertion hole 52 (that is, the edge surface of the insertion hole 52 of the mounting brackets 15 and 16). Thereby, the relative rotation of the sensor 30 is suppressed.

  As described above, in the present embodiment, the convex portions 31 c and 31 d are provided to restrict the relative rotation of the sensor 30. However, the present invention is not limited to this. For example, convex portions 31c and 31d may be provided to define the position of the sensor 30 in the outer peripheral direction of the shaft body of the extending shaft portion 31 (that is, for positioning). Good.

  In addition, if the recessed parts 52a and 52b are formed corresponding to the convex parts 31c and 31d, when each convex part 31c and 31d is latched to the edge surface of the insertion hole 52 of the mounting brackets 15 and 16, respectively. In contact with the edge surface. Thereby, the above-mentioned problem (problem that the extended shaft part 31 comes into contact with the inner peripheral surface of the insertion hole 52 at the edge) is solved. In the present embodiment, the concave portions 52a and 52b are provided so that the convex portions 31c and 31d can be brought into surface contact with the edge surface of the insertion hole 52 of the mounting brackets 15 and 16. It is good also as making a surface contact in the structure replaced with 52a, 52b.

  In addition, at least one of the recesses 52a and 52b is located on the upper side of the shaft body in a state where the extended shaft portion 31 is inserted into the insertion hole 52. In other words, in the present embodiment, the recessed portion that is located on the upper side of the shaft portion main body in a state where the extended shaft portion 31 is inserted into the insertion hole 52 and that can be engaged with the convex portion is inserted into the mounting brackets 15 and 16. It is formed on the edge surface of the hole 52. Thereby, it becomes easy to confirm the mounting state of the sensor 30 (in particular, the positioning state of the sensor 30 in the width direction of the vehicle seat Z).

  In the present embodiment, a plurality (two in the present embodiment) of convex portions 31c and 31d are formed at different positions on the outer periphery of the shaft body. Thereby, the effect which suppresses the relative rotation of the sensor 30 is exhibited more effectively. At this time, it is desirable that the convex portions 31c and 31d are arranged at regular intervals in the circumferential direction of the outer periphery of the shaft body (in the present embodiment, shifted by about 180 degrees).

  Further, in the present embodiment, the shapes (including sizes) of the two convex portions 31c and 31d are different from each other, and this makes it possible to suppress erroneous assembly of the sensor 30.

  In the present embodiment, of the two convex portions, the convex portion 31c on the side where the load is larger in the circumferential direction of the outer periphery of the shaft body is more than the convex portion 31d on the side where the load is smaller in the circumferential direction. It is getting bigger. Here, the side on which the load is larger (smaller) in the circumferential direction of the outer periphery of the shaft body is located downstream (upstream) of the two points different from each other in the circumferential direction of the outer periphery as viewed from the load transmission direction. It is the side to do.

  More specifically, the intersection of the outer periphery of the annular portion of the sensor 30 where the load detection unit 37 is formed and the transmission path (straight path) of the load applied to the load detection unit 37 is the intersection of the annular portion. There are two on the outer circumference. Of these, the lower intersection point (lower intersection point) is an intersection point on which more load is applied, and the convex portion 31c formed at a position corresponding to the lower intersection point in the circumferential direction of the outer peripheral surface of the shaft body is The convex portion on the side where the load is applied more greatly. On the other hand, the upper intersection (upper intersection) is an intersection on the side where the load is applied less, and the convex portion 31d formed at a position corresponding to the upper intersection in the circumferential direction of the outer peripheral surface of the shaft body is a load Becomes a convex portion on the side where the hangs smaller.

  As described above, if the size of the convex portion on the side where the load is applied more is increased, the rigidity becomes higher. Therefore, even if the load is applied larger, the relative position of the sensor 30 can be stably increased. It becomes possible to regulate rotation. In order to increase the rigidity of the convex portion on the side where a greater load is applied, in addition to increasing the size, for example, surface treatment or coating for increasing the rigidity may be applied.

  In the present embodiment, the projecting portions 31 c and 31 d protrude from the outer periphery of the adjacent portion 31 b in the extended shaft portion 31 and are connected to a stepped portion that is the positioning portion 35 of the sensor 30. In other words, in the present embodiment, the step portion and the convex portions 31c and 31d are continuous and integrated in the axial direction. If it has such composition, when processing a shaft and forming convex parts 31c and 31d, it will become possible to form convex parts 31c and 31d comparatively easily.

  Furthermore, in this embodiment, the length from the center of the extending shaft portion 31 to the tips of the convex portions 31 c and 31 d in the radial direction of the extending shaft portion 31 is the outer diameter of the stepped portion that is the positioning portion 35 of the sensor 30. (In this embodiment, it is smaller than the outer diameter of the stepped portion). Thereby, the relative rotation of the sensor 30 can be suppressed while the sensor 30 is easily positioned by the stepped portion. In addition, about the length from the center of the extension shaft part 31 to the front-end | tip of convex part 31c, 31d, you may be equivalent to the outer diameter of said step part. In this case, the ease of positioning of the sensor 30 by the stepped portion is slightly inferior to the case where the length from the center of the extended shaft portion 31 to the tips of the convex portions 31c and 31d is smaller than the outer diameter of the stepped portion. In terms of ease of molding and ensuring rigidity, this is excellent.

  Further, in order to prevent an excessive load from being applied to the convex portions 31 c and 31 d, the outer diameter of the nut screwed into the male screw portion 31 a of the extending shaft portion 31 is larger than the diameter of the insertion hole 52. Is preferable.

<< Other Embodiments >>
In the above-described embodiment, the load measurement sensor mounting structure for measuring the load when an occupant sits on the vehicle seat Z has been described as an example of the load measurement sensor mounting structure of the present invention. However, the above embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Further, the above-described materials, shapes, and the like are merely examples for exhibiting the effects of the present invention, and do not limit the present invention.

  For example, in the above-described embodiment, the load measuring sensor 30 that measures the load by detecting the deformation of the load detecting unit 37 with the strain sensor has been described. However, the present invention is not limited to this, and the deformation of the load detecting unit 37 is not limited thereto. A sensor that measures the load by detecting the current with a magnet and a Hall element may be used.

  In the above embodiment, when the sensor 30 is attached, the extending shaft portion 31 of the sensor 30 is inserted into the insertion hole 52 of the mounting brackets 15 and 16, and the male screw portion 31 a is placed outside the mounting brackets 15 and 16. The nut 39 is finally screwed into the male screw portion 31a. However, the present invention is not limited to this. For example, when the sensor 30 is attached, the distal end of the extension shaft portion 31 does not have to protrude outside the attachment brackets 15 and 16. That is, in a state where the extension shaft portion 31 is inserted into the insertion hole 52, the tip of the extension shaft portion 31 is one end side opening of the insertion hole 52 (opening on the side where the extension shaft portion 31 is inserted), The structure located between the other end side opening located in the other side of the one end side opening may be sufficient. If it is such composition, it will become possible to control that the portion (in other words, the above-mentioned nut 39) projected from mounting brackets 15 and 16 among extension shaft parts 31 interferes with other members.

  In the above embodiment, the S spring 6 is provided as a support spring for supporting the cushion body. In the above embodiment, in order to avoid interference between the sensor 30 and the S spring 6, the sensor 30 is arranged at a position as far as possible from the S spring 6. However, it is not limited to this, The structure provided with the passenger | crew attitude | position support member replaced with support springs, such as a pan frame (sheet metal member), may be sufficient. Even in such a configuration, in order to achieve the compactness of the vehicle seat Z, it is desirable to attach the sensor 30 so as to speak as much as possible from the occupant posture support member.

  In the above embodiment, the bush 43 and the sliding member 42 are provided in order to more appropriately transmit the load from the side frame 2a to the sensor main body 32 (specifically, the load detection unit 37). In 2a, the load detection unit 37 is pressed through the bush 43 and the sliding member 42. However, the present invention is not limited to this, and the bush 43 and the sliding member 42 are not provided, and the side frame 2a directly contacts the load detection unit 37 and presses the load detection unit 37. Good. Further, another relay member in place of the bush 43 and the sliding member 42 may be provided in the load transmission path from the side frame 2a to the sensor main body 32.

  In the above embodiment, the oilless dry met 42 corresponds to a movable part that moves in accordance with the deformation of the load detection unit 37. For example, the side frame 2a directly contacts the load detection unit 37 and the load detection unit 37 In the configuration of pressing 37, the side frame 2a itself corresponds to the movable part.

  In the above embodiment, the vehicle seat Z is taken as an example of the seat. However, the present invention is not limited to this, and the present invention is also applied to other vehicle seats such as airplanes and ships. Is possible. Furthermore, the present invention is not limited to a vehicle and can be applied to any sheet that requires load measurement.

Z Vehicle seat (seat)
F Seat frame S Seat unit 1 Seat back frame (seat frame)
2 Seating frame (seat frame)
2a Side frame 2b Deformation follow-up part 3 Connection pipe 4 Submarine suppression pipe 4a Width direction center part 4b Width direction end part 4c Connection part 5 Construction pan 6 S spring 6a 1st bending part 6b 2nd bending part 10 Rail mechanism 11 Lower rail 12 Upper rail (Rail member)
13 Support bracket 14 Member frame 15 Mounting bracket 16 Mounting bracket 17 Slide lever 18 Bolt (fixing member)
20 tip portion 21 hole portion 22 connecting region (connecting portion)
23 Rear mounting area (protrusion)
23a Overhang portion 24 Front end region 25 Front mounting region (protruding portion)
25a Overhang part 26 Middle area 26a Lower part 26b Upper part 26c Rear side adjacent part 26d Front side adjacent part 30 Sensor (load measurement sensor)
31 Extension shaft part 31a Male thread part 31b Adjacent part 31c, 31d Convex part 32 Sensor main body 33 Shaft body 34 Substrate unit (conversion part)
34a Connector portion 34b Case 35 Positioning portion 36 Housing shaft portion 36a Same diameter portion 36b Different diameter portion 37 Load detecting portion 37a Load receiving surface 37b Free end 37i Inclined surface 39 Nut (fastening means)
40 Sensor mounting parts 41 Spacer (movement limiting part, movement limiting member)
41a Circular hole 41b, 41c End part 42 Sliding member (load input part, load input member)
42a One end side flange (flange portion, first flange portion)
42ax end portion 42a 'thin portion 42b fitting tube portion (tubular portion)
42c The other end side flange (flange part, second flange part)
42c 'Thick part 42d Through hole (load input surface)
42i inclined surface 43 bush (load transmission part, load transmission member)
43a Cylindrical part (small diameter part)
43b collar (extension part, large diameter part)
43c Through-hole 43d Welding part 43e Deformation follow-up part 43i Inclined surface 44 Washer (movement restricting part)
45 E-ring 50 Bottom wall portion 50a Extension portion 51 Standing wall portion 52 Insertion holes 52a, 52b Recess 53 Upper protruding wall 54 Removal portion 101 Seat frame 111 Lower rail 112 Upper rail 130 Load measurement sensor 131 Shaft portion

Claims (8)

A load measuring sensor having a sensor main body for detecting a load from a seat having a seat frame and an extending shaft extending from the sensor main body is mounted in a state where the extending shaft is along a horizontal direction. A load measuring sensor mounting structure to be attached to the bracket,
A load input unit that contacts the sensor body and inputs the load to the sensor body;
The sensor body has a load receiving surface that receives the load in contact with the load input portion,
A surface contact holding mechanism portion that allows the load receiving surface and the load input portion to come into contact with each other when the load is input is formed at a position where the load receiving surface and the load input portion come into contact with each other. Mounting structure of load measuring sensor characterized by A load transmitting member that transmits the load from the seat to the load input unit;
The load receiving surface receives the load from the load input portion and is formed to be displaceable in a direction opposite to the load input portion.
The load measurement sensor mounting structure according to claim 1, wherein the load transmission member includes a deformation follow-up portion that is deformable based on the displacement of the load receiving surface.   The surface contact holding mechanism portion is provided on at least one of a surface that contacts the load receiving surface of the load input portion and a surface that contacts the load input portion of the load receiving surface, and the extension shaft The load measuring sensor mounting structure according to claim 1 or 2, comprising an inclined surface inclined with respect to the axial direction of the portion. The sensor body has a free end on one end side,
4. The load measuring sensor mounting structure according to claim 1, wherein the surface contact holding mechanism is provided on the free end side. The sensor body has a free end on one end side,
The inclined surface is provided on a surface that contacts the load receiving surface of the load input portion, and extends from the free end side toward the opposite side of the free end along the axial direction of the extending shaft portion. 4. The load measuring sensor mounting structure according to claim 3, wherein the load measuring sensor mounting structure is formed as a surface away from the load. The sensor body has a free end on one end side,
The inclined surface is provided on a surface of the load receiving surface that comes into contact with the load input portion, and the load input from the free end side toward the opposite side of the free end along the axial direction of the extending shaft portion. 4. The load measuring sensor mounting structure according to claim 3, wherein the load measuring sensor mounting structure is formed as a surface away from the portion. The load input surface that contacts the load receiving surface of the load input portion covers an end portion of the load receiving surface side of the load transmitting member that transmits the load from the seat, and slides on the load receiving surface. Formed by a movable sliding member,
The thickness of the sliding member is substantially constant,
The load measuring sensor according to claim 3, 5 or 6, wherein an end surface of the load transmitting member on the load receiving surface side is provided with an inclined surface inclined with respect to the load detecting unit. Mounting structure. The sliding member has a through hole that comes into contact with the sensor body when the sliding member is disposed around the sensor body,
It is arranged adjacent to the sliding member on the opposite side of the free end of the sliding member, and includes a ring-shaped movement restricting portion that fits into the sensor body,
The load measuring sensor mounting structure according to claim 7, wherein an inner diameter of the movement restricting portion is smaller than an inner diameter of the through hole of the sliding member on the movement restricting portion side.

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