JP2013028268A - Structure for mounting load measurement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that can keep holding of a load measurement sensor at a position that can achieve an accurate load measurement as a mounting structure of the load measurement sensor.SOLUTION: In the structure for mounting the load measurement sensor (sensor 30) that includes: a sensor body 32 that includes a load receiving surface 37a and detects the load in the direction perpendicular to the load receiving surface 37a; and an extension shaft part 31 that extends from the side of the sensor body 32, to the mounting brackets 15 and 16 so that the extension shaft part 31 is prepared along a horizontal direction, the projections 31c and 31d that project from the extension shaft part 31 abut the recesses 52a and 52b formed in the mounting brackets 15 and 16, when the sensor 30 performs a relative rotation around the extension shaft part 31 to the mounting brackets 15 and 16, while the extension shaft part 31 is inserted in an insertion hole 52 formed in the mounting brackets 15 and 16.

Description

  The present invention relates to a mounting structure for mounting a load measurement sensor, and more particularly to a mounting structure for mounting a load measurement sensor in a state where an extending shaft provided in the load measurement sensor is 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. 16, an upper rail 112 (referred to as “slider” in Patent Document 1) that slides on a lower rail 111 (described as “rail body” in Patent Document 1) attached to a vehicle body 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. FIG. 16 is a view showing the vehicle seat disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 17, 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. FIG. 17 is a diagram showing a load measuring sensor mounting structure disclosed in Patent Document 1. As shown in FIG.

  On the other hand, in recent years, a technique for reducing the height of the vehicle seat has been demanded in order to improve passengers' getting on and off and design, but when the load measuring sensor 130 is attached in the above configuration, the seat frame 101 is There is an inconvenience that the height of the load measuring sensor 130 is increased and the height of the vehicle seat increases.

  In order to solve the above problem, a technique has been proposed in which the axial direction of the shaft portion for attaching the load measuring sensor is not set to the vertical direction but is arranged in the horizontal 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

  Here, when the load measurement sensor is attached so that the axial direction of the shaft portion is horizontal, the load measurement sensor may be attached by inserting the shaft portion into an insertion hole formed in the mounting bracket. On the other hand, when a load detection surface is formed at a predetermined portion of the load measurement sensor in the circumferential direction of the shaft portion, the load measurement sensor rotates relative to the mounting bracket around the shaft portion. As a result, the load detection surface may change in the circumferential direction (rotation direction) with the rotation. This variation of the load detection surface means that the direction of the load detection surface changes with respect to the load, and this adversely affects the load measurement accuracy of the load measurement sensor.

  For this reason, when the shaft portion is inserted into the insertion hole formed in the mounting bracket when the load measuring sensor is attached, it is necessary to prevent the load measuring sensor from rotating relative to the mounting bracket after the attachment. However, in restricting the relative rotation of the load measurement sensor with respect to the mounting bracket, if a force (contact pressure) is applied locally on the load measurement sensor or the mounting bracket, the shaft of the load measurement sensor is turned and the mounting bracket is deformed. There is a risk of doing. And if such a situation continues, when it tries to restrict | limit relative rotation of the load measurement sensor with respect to a mounting bracket finally, it will have influence.

  Therefore, the present invention has been made in view of the above-described problems, and the object of the present invention is to continue to hold the load measurement sensor at a position where accurate load measurement can be realized as the load measurement sensor mounting structure. It is to provide a structure capable of.

  According to the mounting structure to which the load measuring sensor of the present invention is attached, the object includes a sensor body that includes a load receiving surface and detects a load in a direction orthogonal to the load receiving surface, and extends from a side of the sensor body. And a mounting structure for mounting the load measuring sensor including the extending shaft portion to a mounting bracket so that the extending shaft portion is in a horizontal direction, and the mounting bracket is used to insert the extending shaft portion. An insertion hole formed on the extension shaft portion, a convex portion projecting from the extension shaft portion, and a concave portion formed on the mounting bracket and engageable with the projection portion, wherein the extension shaft portion is formed in the insertion hole. In the inserted state, when the load measuring sensor rotates relative to the mounting bracket around the extending shaft portion, the convex portion comes into contact with the concave portion.

  According to the above mounting structure, when the convex portion protruding from the outer periphery of the shaft body is provided and the load measuring sensor rotates relative to the mounting bracket around the shaft portion, the convex portion is attached. The relative rotation of the load measuring sensor is restricted by contacting the concave portion formed on the bracket. This makes it possible to fix the position of the load measurement sensor in the rotation direction and continue to hold the load measurement sensor at a position where accurate load measurement can be realized.

  In the mounting structure described above, when the convex portion comes into surface contact with the concave portion when contacting the concave portion, a force is locally applied to the load measuring sensor or the mounting bracket so that the extension shaft of the load measuring sensor is extended. It becomes possible to suppress the situation where a part is beaten.

  In the above mounting structure, it is preferable that the insertion hole is provided at a position outside a maximum load position where the load is most applied in the axial direction of the extending shaft portion. With this configuration, the load measuring sensor is stably supported by the mounting bracket. More specifically, the axial direction of the extending shaft portion is along the width direction of the seat, and the position where the insertion hole is formed in the width direction is a position where the mounting bracket supports the load measuring sensor. If such a sensor support position deviates from the maximum load position, the load measurement sensor can be stably held without being affected by the load (for example, the influence of the sensor support position changing in the vertical direction). become.

Further, in the above mounting structure, a plurality of the convex portions are formed at different positions on the extension shaft portion, and the mounting bracket is at a position corresponding to the formation position of the convex portions, It is preferable that the same number of the concave portions as the convex portions are formed. With this configuration, since a plurality of convex portions are formed, the force applied to each convex portion is reduced accordingly, so that the convex portions and the concave portions can be reduced in size.
The plurality of convex portions are the two convex portions having different shapes, and each of the same number of the concave portions as the convex portions has a shape corresponding to the shape of the corresponding convex portion. It is more preferable in that it is possible to avoid assembling the load measuring sensor at an incorrect mounting position.
Further, of the two convex portions, the convex portion on the side where the load is applied in the circumferential direction of the extending shaft portion is larger than the convex portion on the side where the load is applied in the circumferential direction. This is even more preferable. If the size of the convex portion on the side where the load is applied is increased in this way, the rigidity of the convex portion increases according to the size, so the convex portion on the side where the load is applied more stably It becomes possible to regulate the relative rotation of the load measuring sensor.

  Further, in the above mounting structure, the sensor body includes a large-diameter portion that is provided in a portion adjacent to the extending shaft portion, and has a larger outer diameter than a screw portion that the extending shaft portion has at a tip portion, The large-diameter portion positions the load measuring sensor in the axial direction of the extended shaft portion by contacting the mounting bracket in a state where the extended shaft portion is inserted into the insertion hole, and It is preferable that the portion and the convex portion are continuous in the axial direction and integrated. With this configuration, the rigidity of the convex portion is improved.

  In the above mounting structure, it is further preferable that the length from the center of the extending shaft portion to the tip of the convex portion in the radial direction of the extending shaft portion is equal to or less than the outer diameter of the large diameter portion. It is. With this configuration, it is possible to easily form the convex portion.

  In the above mounting structure, it is preferable that the insertion hole is a through hole formed along the thickness direction of the mounting bracket. If the insertion hole is a through-hole, it is possible to confirm the mounting state of the load measurement sensor (in particular, the positioning state of the load measurement sensor in the width direction of the seat).

  Further, in the above mounting structure, in the state where the extension shaft portion is inserted into the insertion hole, the convex portion includes one end side opening of the insertion hole into which the extension shaft portion is inserted, and the one end. It is good also as being located between the other end side opening located in the other side of a side opening. If it is this structure, it will become possible to suppress that a convex part and an other member interfere.

  Further, in the above mounting structure, the recess is located above the extension shaft in a state where the extension shaft is inserted into the insertion hole, and the recess is in the thickness direction of the mounting bracket. It is preferable that the mounting bracket is formed so as to penetrate along the mounting bracket. With such a configuration, it becomes easy to confirm the mounting state of the load measuring sensor (in particular, the engagement state between the convex portion and the concave portion).

  Further, in the mounting structure, the load measuring sensor is mounted on the extension shaft with respect to the mounting bracket in a state where the extension shaft portion is inserted into the insertion hole when the convex portion comes into contact with the concave portion. It is preferable that the rotation angle when the relative rotation is performed around the part is suppressed to 15 degrees or less. More preferably, the rotation angle is suppressed to 10 degrees or less when the convex portion comes into contact with the concave portion. By restricting the rotation angle, the measurement accuracy of the load measuring sensor is improved.

According to the first aspect of the present invention, it is possible to fix the position of the load measurement sensor in the rotation direction and continue to hold the load measurement sensor at a position where accurate load measurement can be realized.
According to the second aspect of the present invention, it is possible to suppress a situation in which a force is locally applied to the load measurement sensor or the mounting bracket and the extension shaft portion of the load measurement sensor is bent.
According to the invention of claim 3, the load measuring sensor is stably supported by the mounting bracket.
According to the invention of claim 4, since a plurality of convex portions are formed, the force applied to each convex portion is reduced accordingly, so that the convex portions can be reduced in size.
According to the invention of claim 5, it is possible to avoid assembling the load measuring sensor at an incorrect attachment position.
According to the sixth aspect of the present invention, the rigidity of the convex portion on the side where the load is larger is increased by the size, so that the convex portion on the side where the load is larger can be stably applied to the convex portion on the side where the load is larger. It becomes possible to regulate the relative rotation.
According to the invention of claim 7, the rigidity of the convex portion is improved.
According to invention of Claim 8, formation of a convex part becomes easy.
According to the ninth aspect of the present invention, it is possible to confirm the mounting state of the load measuring sensor (in particular, the positioning state of the load measuring sensor in the width direction of the seat).
According to invention of Claim 10, it becomes possible to suppress that a convex part interferes with another member.
According to the eleventh aspect of the present invention, it is easy to confirm the mounting state of the load measuring sensor (in particular, the engagement state between the convex portion and the concave portion).
According to the twelfth aspect of the invention, the measurement accuracy of the load measuring sensor is improved, and according to the thirteenth aspect of the invention, the measurement precision is further improved.

It is an external 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 a figure which shows the attachment structure of a load measurement sensor. It is a perspective view which shows a side frame (the 1). It is a perspective view which shows a side frame (the 2). 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 in FIG. It is an enlarged view around a 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 a figure which shows the vehicle seat disclosed by patent document 1. FIG. It is a figure which shows the load measurement sensor attachment structure disclosed by patent document 1. FIG.

  Hereinafter, a load measurement sensor mounting structure according to an embodiment (this embodiment) of the present invention 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 an external 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. 3 is a perspective view showing the load measuring sensor. FIG. 4 is a side view showing the load measuring sensor. FIG. 5 is a view showing a mounting structure of the load measuring sensor, and is a view showing a cross section around the load measuring sensor. 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.

  In the figure, symbol FR indicates the front of the vehicle, and symbol RR indicates the rear of the vehicle. In the following description, the width direction of the vehicle seat Z is the left-right direction in a state of facing the front of the vehicle, and corresponds to the horizontal direction. Further, in FIG. 4, for the convenience of illustration, illustration of a sensor mounting component 40 described later is omitted.

  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.

  For the above purpose, the sensor 30 is attached to a predetermined position of the seat unit S (see FIG. 3).

<Vehicle seat structure>
Hereinafter, in describing the mounting structure of the sensor 30, first, the structure of the seat unit S including the vehicle seat Z 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 mechanism 10. The vehicle seat Z illustrated in FIG. 1 is an example of a seat, and includes a seat frame F (see FIGS. 2 and 3) and a cushion body as a skeleton thereof. 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 seat back frame at the rear end. Further, 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 (see FIG. 4).

  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. Then, the cushion body 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 mechanisms 10 are provided, and one (left side) rail mechanism 10 and the other (right side) rail mechanism 10 are spaced apart in the left-right direction in a parallel state. Each rail mechanism 10 includes 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 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 12 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. A support bracket 13 is attached to each lower surface of the 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 fastening 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 and the vehicle seat Z is placed on each of the lower rails 11. Become. A sensor 30 (described later) is attached to the attachment brackets 15 and 16.

  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 and a sensor main body 32. 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 body 32 includes a large-diameter portion (specifically, a later-described step) formed in the shaft body, an outer cylinder body through which the shaft body is inserted, and a substrate unit attached to the outer cylinder body. 34. 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 (tip 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 addition, in this embodiment, although the external thread part 31a as a thread part was formed in the extension shaft part 31, it is good also as an internal thread being 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. That is, the positioning portion 35 is a stepped portion provided as a component of the sensor body 32 at a portion adjacent to the extending shaft portion 31. And the level | step-difference part which makes the positioning part 35 has a somewhat larger outer diameter than the external thread part 31a and the adjacent part 31b, and is corresponded to a large diameter part.

  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 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 electrical signal (see, for example, FIG. 14). Includes cases and the like. 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, the connecting region 22 (that is, the rear end portion) connected to the seat back frame in the side frame 2a is located on the innermost side in the side frame 2a (in other words, for the vehicle). It is closest to the second rail member in the width direction of the sheet Z). The region located in front of the connection region 22 and having the rear hole 21 (hereinafter referred to as rear attachment region 23) protrudes somewhat outward from the connection region 22, As shown in FIG. 6B, the 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 attachment region 25) located behind the region corresponding to the front end portion (front end region 24) of the side frame 2a and having the front hole portion 21 (hereinafter referred to as front mounting region 25) is located outside the front end region 24. Is located. 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. As described above, since the mounting brackets 15 and 16 for mounting the sensor 30 are separate from the upper rail 12, the sensor 30 can be easily remounted even when the seat design is changed. Thus, the versatility of the mounting structure of the sensor 30 is improved and the maintainability is also improved.

  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 separately for each sensor 30. 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.

  As described above, since the members (specifically, the mounting brackets 15 and 16) for mounting the sensor 30 along the longitudinal direction of the upper rail 12 are divided into a plurality of parts, the individual mounting brackets 15 and 16 are separated. Since it is possible to adjust the fixed position separately, the adjustment accuracy of the fixed position is improved.

  The mounting bracket 15 for the front sensor 30 is different from the mounting bracket 16 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.

  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 pair of rail mechanisms 10 (that is, the first frame mechanism) 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. .

  Thereafter, the nut 39 is screwed into the male screw portion 31a protruding from the outer surface of the standing wall portion 51, whereby the sensor 30 is attached at a predetermined attachment position. In this state, the sensor 30 is in a posture in which the axial direction of the extending shaft portion 31 is along the horizontal direction (specifically, the width direction of the vehicle seat Z). 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).

  When the sensor 30 is attached in a cantilever state, attachment is easier than in the case where the sensor 30 is attached in a both-end state (a state where both ends of the sensor 30 are supported). On the other hand, when the sensor 30 is attached in a cantilever state, the position of the sensor 30 (arrangement position) needs to be stable for the sensor 30 to perform good measurement. To stabilize the position of the sensor 30 Sufficient mounting rigidity is required for the support members (specifically, the mounting brackets 15 and 16) that support the sensor 30. In the present embodiment, as described above, the rigidity of the mounting brackets 15 and 16 is increased by providing the upper projecting wall 53, so that the sensor 30 can be stably supported.

  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. More specifically, the axial direction of the extending shaft portion 31 is along the width direction of the vehicle seat Z, and the mounting brackets 15 and 16 are located at the positions where the insertion holes 52 are formed in the width direction by the sensor 30. Is a position that supports If the support position of the sensor 30 deviates from the maximum load position, the sensor 30 can be stably held without being affected by the load (for example, the effect of the support position changing in the vertical direction, etc.). become.

  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 bend to the radial inside of the extension shaft part 31, and the magnitude | size of the said load is measured in the load measurement part 38 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 attached to the above attachment position, the lower end surface of the sensor 30 is 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), as shown in FIG. Is 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 mechanism 10) is also facilitated. .

<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 is arranged in the order of the spacer 41, the sliding member 42, the bush 43, and the washer 44 from the outside in the width direction of the vehicle seat Z.

  The bush 43 is provided to transmit a 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 has a structure in which a cylindrical portion 43a and a substantially diamond-shaped flange portion 43b are adjacent to each other in the thickness direction, as shown in FIG. . That is, the flange portion 43b is formed so as to extend radially outward from one axial end side of the cylindrical portion 43a. 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 configuration, when the bush 43 is attached to the side frame 2a, the flange 43b of the bush 43 is included in the bulged portion of the front attachment region 25 (or the rear attachment region 23). There is no need to increase the overall sheet width for attachment. As a result, the bush 43 can be attached in a compact manner.

  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. Bush 43 comes to be located in the part which presses sensor body 32 of this.

  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 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.

  The sliding member 42 abuts on the sensor 30 and is provided to input a load from the seat frame F provided on the vehicle seat Z to 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.

  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 fitted into the through hole 43c of the bush 43, and one end side flange portion 42a adjacent to one end portion of the fitting cylinder portion 42b. The other end portion of the fitting tube portion 42b is adjacent to the other end side flange portion 42c. 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 of sandwiching the bush 43 therebetween (see FIG. 11). ). 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.

  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 to which the board unit 34 is attached than to the end (free end) where the load detection unit 37 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.

  Note that the contact surface of the sliding member 42 with the load detection portion 37 (specifically, the region facing the load receiving surface 37 a in the inner peripheral surface of the through hole 42 d) of the extension shaft portion 31. It has a spread in the axial direction. 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.

  The washer 44 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 on the inner side of 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.

  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 is sized such that its inner peripheral end is radially inward from the bottom surface of the substrate unit 34 provided in the sensor 30 and its outer peripheral end is radially outward from the bottom surface of the substrate unit 34. Is formed. 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. 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. In this way, by forming the washer 44 having 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 prevent the movement thereof. it can.

  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 time required for attaching the sensor 30 can be reduced.

  The spacer 41 is a cylindrical member made of a hot-rolled steel plate. As shown in FIG. 11, the standing wall portion 51 of the mounting brackets 15 and 16 and the sliding member 42 in a state where the sensor 30 is mounted at the mounting position described above. Between the sliding member 42 and the sliding member 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 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.

  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.

  As a configuration different from the above configuration, in the state where the sensor 30 is mounted on the mounting brackets 15 and 16, the spacer 41 has an end surface (free end 37 b) on the outer side in the seat width direction of the load detection unit 37 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 radial direction (direction orthogonal to the axial direction of the extension shaft part 31) of the sensor 30. By attaching the spacer 41 with such a configuration, it is possible to prevent the load detection unit 37 from interfering with the load detection unit 37 and reducing the load detection error when the load detection unit 37 is deformed by receiving a load. .

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 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.

  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. (For example, a part of the standing wall 51 may be formed so as to bulge toward the sensor main body 32). By integrally forming the spacer 41 in this way, the number of components can be reduced, and the time required for the mounting operation of the sensor 30 can be shortened.

<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. Therefore, when the sensor 30 is attached to the attachment position, the connector part 34a provided in the board unit 34 is outside (on the side in the width direction of the first rail member (end on the side where the second rail member is located) outside ( (Position away from the second rail member). 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 embodiment, the axial section of the extending shaft portion 31 is a perfect circle. On the other hand, when the sensor 30 is attached, the sensor 30 is inserted into the two overlapped holes (the insertion hole 52 and the hole portion 21) from the extending shaft portion 31 side and positioned in the width direction of the vehicle seat Z. The state of the sensor 30 is in a state located at a predetermined position in the circumferential direction of the extending shaft portion 31. At this predetermined position, the load detection unit 37 and the load receiving surface 37a are positioned substantially directly below the side frame 2a in the load transmission direction, so that the load can be appropriately received.

  By the way, 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. And if the sensor 30 rotates relatively with respect to the attachment brackets 15 and 16, the load detection part 37 and the load receiving surface 37a will move to the said rotation direction in connection with this. The fluctuation of the load receiving surface 37a means that the direction of the load receiving surface 37a with respect to the load is changed, and this adversely affects the load measurement accuracy of the sensor 30.

  Therefore, when the extension shaft portion 31 is inserted into the insertion hole 52 formed in the mounting brackets 15 and 16 when the sensor 30 is mounted, the sensor 30 rotates relative to the mounting brackets 15 and 16 after the mounting. It is necessary to suppress. However, in restricting the relative rotation of the sensor 30 with respect to the mounting brackets 15, 16, if a force (contact pressure) is applied locally on the sensor 30 or the mounting brackets 15, 16, the extension shaft portion 31 is turned and attached. The brackets 15 and 16 may be deformed. And if such a situation continues, there is a possibility that the relative rotation of the sensor 30 with respect to the mounting brackets 15 and 16 cannot be regulated finally.

  Therefore, as another means for suppressing the relative rotation of the sensor 30, as shown in FIG. 15, it is conceivable to provide the extended shaft portion 31 with a convex portion protruding radially outward from the outer periphery of the shaft portion main body. Here, the shaft portion main body is a portion of the extended shaft portion 31 excluding the convex portion, and specifically, is an adjacent portion 31b adjacent to the male screw portion 31a.

  The above-described means for suppressing the relative rotation of the sensor 30 will be described in detail. The extended shaft portion 31 is provided with a plurality of convex portions at positions different from each other in the circumferential direction of the extended shaft portion 31. Then, the two convex portions 31c and 31d are provided.

  On the other hand, on the inner peripheral surface of the insertion hole 52, concave portions 52a and 52b of the same number (that is, two) as the convex portions 31c and 31d are formed at positions corresponding to the positions where the convex portions 31c and 31d are formed. Each of the concave portions 52a and 52b is configured such that the corresponding convex portions 31c and 31d can be engaged with each other. Here, the combination of the concave part and the convex part to be engaged is determined in advance. Specifically, the convex part 31c is engaged with the concave part 52a, and the convex part 31d is engaged with the concave part 52b. The combination of the concave portion and the convex portion corresponds to the correspondence between the concave portion and the convex portion.

  Then, the extending shaft portion 31 is inserted into the insertion hole 52 so that the respective convex portions 31c and 31d engage with the corresponding concave portions 52a and 52b. 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 and 31d described above. Are brought into contact with recesses 52a and 52b (specifically, one side surface of the recesses 52a and 52b) formed on the inner peripheral surface of the insertion hole 52 (specifically, they are brought into a locked state by contact). . 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, and for example, convex portions 31c and 31d are provided for defining (fixing) 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). It is good as well.

  And if the recessed parts 52a and 52b are formed corresponding to the convex parts 31c and 31d, when each convex part 31c and 31d contact | abuts (latches) to the corresponding recessed parts 52a and 52b, this It is in surface contact with the recesses 52a and 52b. This solves the above-described problem, that is, the problem that the extended shaft portion 31 comes into contact with the inner peripheral surface of the insertion hole 52 at the edge. As a result, it is possible to continue to properly regulate the relative rotation of the sensor 30 with respect to the mounting brackets 15 and 16, and the sensor 30 is held at a position where accurate load measurement can be realized.

  Incidentally, in the present embodiment, the concave portions 52a and 52b are provided so that the convex portions 31c and 31d can come into surface contact with the edge surface of the insertion hole 52 of the mounting brackets 15 and 16, but it is sufficient that the concave portions 52a and 52b can be brought into surface contact. , 52b may be used for surface contact.

  In addition, at least one of the recesses 52 a and 52 b is positioned above the extension shaft portion 31 in a state where the extension shaft portion 31 is inserted into the insertion hole 52. Further, each of the recesses 52 a and 52 b is formed so as to penetrate the mounting brackets 15 and 16 in the thickness direction of the mounting brackets 15 and 16. Thereby, it becomes easy to confirm the mounting state of the sensor 30 (in particular, the engagement state of the convex portion and the concave portion).

  In addition, a plurality (two in this embodiment) of convex portions 31c and 31d are formed on the extended shaft portion 31 at different positions, and the convex portions 31c and 31d are formed on the mounting brackets 15 and 16, respectively. The same number of concave portions 52a and 52b as the convex portions 31c and 31d are formed at positions corresponding to the formation positions of. By providing a plurality of convex portions in this way, the force applied to the individual convex portions is reduced by that amount, whereby the sizes of the individual convex portions and the concave portions can be reduced. 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 the shapes of the two concave portions 52a and 52b are the shapes of the corresponding convex portions 31c and 31d. It has a shape according to. This makes it possible to avoid assembling the sensor 30 at an incorrect attachment position. If it demonstrates easily, when inserting the extension shaft part 31 in the insertion hole 52, it will become possible to engage each convex part 31c, 31d reliably to corresponding recessed part 52a, 52b.

  In the present embodiment, in the state in which the extended shaft portion 31 is inserted into the insertion hole 52, each of the convex portions 31c and 31d extends from the insertion hole 52 (more specifically, the concave portions 52a and 52b). It is located between one end side opening into which the shaft portion 31 is inserted and the other end side opening located on the opposite side of the one end side opening. With this configuration, each of the convex portions 31c and 31d can be accommodated in the insertion hole 52 (the concave portions 52a and 52b), so that interference with other members can be suppressed.

  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 extending shaft portion 31 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 is the side that is located downstream (upstream) of the two points that are different from each other in the circumferential direction when viewed from the transmission direction of the load. .

  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. Among these, the intersection point (lower side intersection point) located downstream is the intersection point on which the load is more greatly applied, and the convex part 31 c formed at a position corresponding to the lower side intersection point in the circumferential direction of the extending shaft part 31 is: It becomes the convex part on the side where the load is more greatly applied. On the other hand, the upper intersection (upper intersection) is an intersection on the side where the load is applied smaller, and the convex portion 31d formed at the position corresponding to the upper intersection in the circumferential direction is on the side where the load is applied less. It becomes the convex part.

  In this way, if the size of the convex portion on the side where the load is applied more is increased, the rigidity will increase in accordance with the size. Therefore, the convex portion on the side where the load is applied is also stably detected. The relative rotation of 30 can be restricted. 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, the rigidity of convex parts 31c and 31d will improve.

  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, it becomes possible to easily form the convex portions 31c and 31d. 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.

  By the way, when the sensor 30 rotates relative to the mounting brackets 15 and 16, the measurement accuracy decreases as the rotation angle increases. In the present embodiment, since the convex portions 31c and 31d and the concave portions 52a and 52b are provided as described above, the extended shaft portion 31 is inserted by the convex portions 31c and 31d coming into contact with the concave portions 52a and 52b. In a state where the sensor 30 is inserted into the hole 52, the rotation angle when the sensor 30 rotates relative to the mounting brackets 15 and 16 around the extending shaft portion 31 is suppressed to 15 degrees or less. Thereby, the measurement accuracy of the sensor 30 is improved. In particular, in the present embodiment, the convex portions 31c and 31d abut on the concave portions 52a and 52b, so that the rotation angle is suppressed within 10 degrees, and the measurement accuracy is further improved.

<< 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 embodiment, the sensor 30 that measures the load by detecting the deformation amount of the load detection unit 37 with the strain sensor is described as an example. However, the present invention is not limited to this, and the deformation of the load detection unit 37 is not limited thereto. It may be a load measuring sensor provided with a magnet that displaces along with the Hall element facing the magnet. In the load measuring sensor having such a configuration, when the load detecting unit 37 is deformed, the magnet is displaced accordingly, the Hall element measures the amount of displacement, and the load is measured from the measurement result.

  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 as far 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 may be in direct contact with the load detection unit 37 to press 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 sliding member 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 is used. In the configuration in which the side frame 2a is pressed, 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.

1 seat back frame, 2 seating frame, 2a side frame,
3 connecting pipes,
4 submarine suppression pipe, 4a width direction center part, 4b width direction end part, 4c connection part,
5 construction pan, 6 S spring, 6a first bending portion, 6b second bending portion,
10 rail mechanism, 11 lower rail, 12 upper rail,
13 Support bracket, 14 Member frame, 15 Mounting bracket,
16 Mounting bracket, 17 Slide lever, 18 bolt,
20 tip portion, 21 hole portion, 22 connecting region,
23 rear mounting area, 23a overhang, 24 front end area,
25 front mounting area, 25a overhang,
26 middle region, 26a lower part, 26b upper part, 26c rear side adjacent part,
26d front adjacent region,
30 sensor, 31 extension shaft part, 31a male thread part, 31b adjacent part,
31c convex part, 31d convex part,
32 sensor body, 33 shaft body, 34 substrate unit, 34a connector section,
35 Positioning part, 36 Housing shaft part, 36a Same diameter part, 36b Different diameter part,
37 Load detector, 37a Load receiving surface, 37b Free end, 39 Nut,
40 sensor mounting parts, 41 spacer, 41a circular hole,
42 sliding member, 42a one end side flange,
42b fitting cylinder part, 42c other end side collar part, 42d through-hole,
43 Bushing, 43a Cylindrical part, 43b Ridge part, 43c Through hole,
44 washer,
50 bottom wall, 51 standing wall, 52 insertion hole,
52a recess, 52b recess, 53 upward projecting wall, 54 removal part,
101 seat frame, 111 lower rail, 112 upper rail,
130 load measuring sensor, 131 shaft,
F seat frame, S seat unit, Z vehicle seat

Claims (13)

A load measuring sensor comprising a sensor body having a load receiving surface and detecting a load in a direction orthogonal to the load receiving surface, and an extending shaft portion extending from a side of the sensor body. The mounting structure is attached to the mounting bracket so that the portion is along the horizontal direction,
An insertion hole formed in the mounting bracket for inserting the extension shaft portion, a convex portion protruding from the extension shaft portion, and a concave portion formed in the mounting bracket and engageable with the convex portion. With
When the extension shaft portion is inserted into the insertion hole, when the load measurement sensor rotates relative to the mounting bracket around the extension shaft portion, the projection comes into contact with the recess. A mounting structure for mounting a load measuring sensor.   The mounting structure for attaching a load measuring sensor according to claim 1, wherein the convex portion comes into surface contact with the concave portion when contacting the concave portion.   3. The mounting for attaching a load measuring sensor according to claim 1, wherein the insertion hole is provided at a position outside a maximum load position where the load is most applied in an axial direction of the extending shaft portion. Construction. A plurality of the convex portions are formed at different positions on the extension shaft portion,
The load according to any one of claims 1 to 3, wherein the mounting bracket has the same number of concave portions as the convex portions at positions corresponding to the formation positions of the convex portions. Mounting structure for mounting measurement sensors. The plurality of convex portions are two convex portions having different shapes from each other,
The mounting structure for attaching a load measuring sensor according to claim 4, wherein each of the same number of the concave portions as the convex portions has a shape corresponding to a shape of the corresponding convex portion.   Of the two convex portions, the convex portion on the side where the load is applied more in the circumferential direction of the extending shaft portion is larger than the convex portion on the side where the load is applied smaller in the circumferential direction. A mounting structure for mounting the load measuring sensor according to claim 5. The sensor body is provided in a portion adjacent to the extended shaft portion, and includes a large-diameter portion having an outer diameter larger than a screw portion that the extended shaft portion has at a tip portion,
The large-diameter portion positions the load measuring sensor in the axial direction of the extension shaft portion by contacting the mounting bracket in a state where the extension shaft portion is inserted into the insertion hole,
The mounting structure for attaching a load measuring sensor according to any one of claims 1 to 6, wherein the large-diameter portion and the convex portion are continuous and integrated in the axial direction.   The load according to claim 7, wherein a length from a center of the extended shaft portion to a tip of the convex portion in a radial direction of the extended shaft portion is equal to or less than an outer diameter of the large diameter portion. Mounting structure for mounting measurement sensors.   The mounting structure for mounting a load measuring sensor according to any one of claims 1 to 8, wherein the insertion hole is a through hole formed along a thickness direction of the mounting bracket.   In a state where the extension shaft portion is inserted into the insertion hole, the convex portion is positioned on one end side opening of the insertion hole where the extension shaft portion is inserted and on the opposite side of the one end side opening. The mounting structure for mounting the load measuring sensor according to claim 9, wherein the mounting structure is located between the opening on the other end side.   The recess is located above the extension shaft in a state where the extension shaft is inserted into the insertion hole, and the recess penetrates the mounting bracket along the thickness direction of the mounting bracket. The mounting structure to which the load measuring sensor according to claim 10 is attached.   When the projecting portion abuts on the recessed portion, the load measuring sensor rotates relative to the mounting bracket around the extending shaft portion in a state where the extending shaft portion is inserted into the insertion hole. The mounting structure for attaching the load measuring sensor according to any one of claims 1 to 11, wherein the rotation angle is suppressed to 15 degrees or less.   The mounting structure for attaching a load measuring sensor according to claim 12, wherein the rotation angle is suppressed to within 10 degrees when the convex portion comes into contact with the concave portion.

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