JP5960514B2 - Mounting structure for mounting load measurement sensor - Google Patents

Description

  The present invention relates to an attachment structure for attaching a load measurement sensor, and more particularly, to an attachment structure for attaching a load measurement sensor to a seat in a state where an extending direction of an extension portion 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 for sliding the vehicle seat in the front-rear direction and a seat frame constituting the vehicle seat (See, for example, Patent Document 1).

  In Patent Document 1, as shown in FIG. 14, an upper rail 112 (referred to as “slider” in Patent Document 1) slides on a lower rail 111 (described as “rail body” in Patent Document 1) attached to a vehicle floor. The load measurement sensor 130 (described as “load sensor” in Patent Document 1) is attached above the load measurement sensor 130, and the seat frame 101 is disposed above the load measurement sensor 130. A configuration is disclosed. FIG. 14 is a view showing the vehicle seat disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 15, 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. 15 is a diagram showing a load measurement sensor mounting structure disclosed in Patent Document 1. As shown in FIG.

  On the other hand, in recent years, it has been required to reduce the height of the vehicle seat in order to improve the occupant's boarding / exiting ability and design, but when the load measuring sensor 130 is attached in the same manner as in Patent Document 1, There is a disadvantage that the seat frame 101 is disposed higher by the height of the load measuring sensor 130 and the height of the vehicle seat becomes higher.

  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 measurement sensor is not set to the vertical direction but is arranged in the horizontal direction (for example, see 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 in the vehicle seat, the height of the vehicle seat can be made lower than that of the configuration disclosed in Patent Document 1.

Japanese Patent No. 4205028 JP 2010-42809 A

  By the way, as a structure for attaching the load measurement sensor to the seat in such a posture that the axial direction of the shaft portion is horizontal, a load input portion for inputting a load to the load measurement sensor when the occupant sits on the seat is provided on the seat side In addition, a configuration in which the load measuring sensor is provided with a deforming portion that is deformed by a load input from the load input portion is conceivable. In such a configuration, the load measuring sensor measures the magnitude of the load based on the amount of deformation when the deformed portion is deformed by the load. When measuring a load using such a load measuring sensor, if the load input from the load input part is not transmitted to the deformed part, the deformed part will not be deformed properly, and as a result, the load is input from the load input part. In spite of this, the load measuring sensor cannot properly detect the load.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to provide a load input sensor provided on the seat as a mounting structure for attaching the load measuring sensor to the seat. The object is to realize a mounting structure that can be accurately detected.

According to the mounting structure to which the load measuring sensor of the present invention is attached, the object is to provide a load measuring sensor including a sensor main body that detects a load applied to a seat, and an extending portion that extends from one end of the sensor main body. A mounting structure in which the extension portion is fastened and attached to an attachment member provided on the seat in a state where the extension portion is located on a side of the sensor body, and is in contact with the load measurement sensor A load input unit for inputting a load to the load measurement sensor; and a sensor body receiving unit to which the sensor body is pressed when the load measurement sensor is moved by the load input from the load input unit. The load measuring sensor is deformed by being pressed against the sensor body receiving portion when the load measuring sensor is moved by the load input from the load input portion. Includes a deformation portion to the sensor main body, the deformation of the mutant forms part measures the magnitude of the load, the deformable portion is a circular portion distorted radially by press against the sensor body receiving portion, wherein The sensor main body receiving portion has a sliding member that contacts the outer periphery of the annular portion when the annular portion presses against the sensor main body receiving portion, and is slidable on the outer peripheral surface of the annular portion. The sliding member is a cylindrical body into which the annular portion is fitted, and has flanges at both ends in the sliding direction of the sliding member, and the flange on one end side in the sliding direction. And the flange portion on the other end side are formed in a symmetrical shape, and in a state where the load measuring sensor is attached to the attachment member, the load input part and the sensor body receiving part are mutually It is solved by being separated.

In the above mounting structure, since the load input part and the sensor body receiving part are located at a distance from each other in the extending direction of the extending part, load measurement is performed when a load is input from the load input part to the load measuring sensor. The sensor moves, and the deforming portion is pressed against the sensor main body receiving portion and deformed by the moving operation. By such a procedure, the input load from the load input unit is reliably transmitted to the sensor body, more specifically to the deformed unit. Furthermore, even if the input load is very small, the load is appropriately transmitted from the load input part to the deformed part by the lever principle. As a result, with the mounting structure of the present invention, the load input from the load input portion can be appropriately transmitted to the deformed portion, and the load can be accurately detected.
In the mounting structure described above, if the flanges provided at both ends in the sliding direction of the sliding member have a symmetrical shape, the annular portion acts on the flange when contacting the sliding member. It is possible to suppress the force from becoming unbalanced between the buttocks. Further, if both the flange portions are symmetrical, since the sliding member may be attached from either end when attaching the sliding member to the annular portion, the attaching operation of the sliding member becomes easy.

Incidentally, before Symbol rotates said load measuring sensor by the load inputted from the load input portion, the flexible portion is moved in the direction pressed against the sensor body receiving portion by the rotation of the load measuring sensor, the load In the state where the measurement sensor is attached to the attachment member, the load input portion and the sensor body receiving portion are separated from each other in the extending direction of the extending portion. Can be demonstrated.

In a state where front Symbol load measuring sensor is attached to the mounting member, in the load input portion is the extending direction of the extending portion, positioned on the opposite side to the sensor body as viewed from the sensor body receiving portion It is preferable to do so.
Thus, if the load input unit is separated from the sensor main body, even if an excessive load is input from the load input unit, the load does not directly act on the sensor main body, so that the sensor main body is protected. It becomes possible.

Also, before Symbol sheet has a side frame disposed at a distance from each other in the width direction of the sheet, the sensor body receiving portion, in a position aligned with the side frame in the extending direction of the extending portion And a standing wall portion formed with an insertion hole into which the deformable portion is inserted, and a portion of the standing wall portion located below the insertion hole extends downward along the vertical direction. It is preferable to use it.
Thus, if the standing wall part which comprises a sensor main body receiving part is directly extended below, it will become possible to suppress that a sheet | seat will enlarge because a standing wall part spreads in the width direction of a sheet | seat.

Further, the prior SL sensor body receiving portion, it is preferable to constitute at least a portion of the rail member to which the sheet is placed.
Since the rail member has a relatively high rigidity, if at least a part of the rail member is configured by the sensor body receiving portion as described above, the rigidity of the sensor body receiving portion is ensured, and as a result, the deformed portion can be stably provided in the sensor body. It comes to press against the receiving part.

Further, the prior SL sensor body receiving portion includes a vertical wall portion insertion hole into which the deformable portion is inserted is formed, upstanding wall portion, the insertion hole formed inside the protruding in the width direction of the sheet It is preferable that when the load measuring sensor is moved by the load input from the load input portion, the deforming portion presses against the inner peripheral surface of the insertion hole.
As described above, since the area of the inner peripheral surface of the insertion hole against which the deformed portion is pressed is increased by the amount corresponding to the annular portion, the deformed portion is easily pressed against the inner peripheral surface of the insertion hole, and as a result, the load on the deformed portion is reduced. Is easily transmitted.

Further, in the above configuration, it is preferable that prior Symbol width direction the load input portion projects toward the side located.
If the annular portion protrudes toward the side where the load input portion is located, the load measuring sensor is rotated by the load input from the load input portion, and the deformed portion is pressed against the inner peripheral surface of the insertion hole. First, since it comes to press against the inner peripheral surface on the base end side having higher rigidity in the annular portion, the deformed portion can be appropriately pressed against the sensor body receiving portion.

Alternatively, pre-Symbol annulus, the side on which the load input portion in the width direction is located may be protruding toward the opposite side.
If the annular part protrudes toward the side opposite to the side where the load input part is located, the load measuring sensor is rotated by the load input from the load input part and the deformed part is brought to the inner peripheral surface of the insertion hole. When pressing, first, it presses against the inner peripheral surface of the insertion hole on the free end side of the annular portion. As a result, even if an excessive load is input from the load input portion, the free end portion bends and deforms due to the deformable portion pressing against the inner peripheral surface of the insertion hole on the free end side of the annular portion, and the deformable portion It is possible to absorb the overload by releasing the impact load generated by the collision with the annular portion.

Also, press against the inner peripheral surface of the insertion hole said annular portion when moving said load measuring sensor by the load inputted from the front Symbol load input portion through the sliding member, front Kitsuba portion One end side flange portion located on one end side in the sliding direction is adjacent to the tip portion outside the tip end portion of the annular portion in the width direction and inside the outer edge of the one end side flange portion. It is preferable that the outer edge of the tip portion of the annular portion is located.
The sliding member is configured by inserting the base material into the annular part and caulking one end part protruding from the annular part. And the collar part formed by crimping the one end part which protruded from the annular part among sliding members comes to adjoin the front-end | tip part of an annular part. At this time, if the outer edge of the tip portion of the annular portion is located inside the outer edge of the collar portion, a margin is secured by the amount of overhanging from the outer edge of the tip portion of the annular portion when the caulking process is performed. can do.

The front Symbol sensor body includes an inner portion located inside the said annular portion in the radial direction, the inner side, said annular to the annular portion when distorted inward in the radial direction An inner portion large-diameter region that abuts against the inner portion, and an inner portion small-diameter region that is adjacent to the inner-portion large-diameter region and is smaller in diameter than the inner-portion large-diameter region. In the state attached to the member, it is preferable that the inner portion large-diameter region and at least a part of the inner portion small-diameter region are disposed in the insertion hole.
Since the load is transmitted to the portion of the annular portion that is distorted in the radial direction and abuts against the inner large diameter region, the load measuring sensor is attached to the inner large diameter region and the inner small diameter region. If at least a part of the annular portion is disposed in the insertion hole, the entire portion of the annular portion where the load is transmitted is surrounded by the annular portion. As a result, the portion of the annular portion to which the load is transmitted reliably presses against the annular portion, and the load is reliably transmitted.

The front Symbol sheet is provided with a side frame disposed at a distance from each other in the width direction of the sheet, the mounting member, it is preferable that is the side frames.
As described above, when the load measurement sensor is attached to the relatively rigid side frame in the frame of the seat, the support rigidity for the load measurement sensor is improved, and the load measurement sensor is stably disposed at the attachment position. It is possible to keep.

According to the present invention, the load input from the load input unit is appropriately transmitted to the deformed portion by the displacement of the deformed portion to a position where the load is pressed against the sensor body receiving portion as the load measuring sensor rotates. At the same time, even if the load input from the load input portion is very small, the load is appropriately transmitted from the load input portion to the deformed portion by the lever principle. As described above, the load input from the load input unit can be appropriately transmitted to the deforming unit, so that the load can be accurately detected.
Further, according to the present invention, it is possible to be more effectively exhibit the effect of the invention described in claim 1 in which the above mentioned.
In addition, according to the present invention, even if an excessive load is input from the load input unit, the excessive load does not directly act on the sensor main body, so that the sensor main body can be protected.
Moreover, according to this invention, it becomes possible to suppress that the force which acts on the collar part of a sliding member when an annular part contact | abuts to a sliding member becomes imbalanced between collar parts. Moreover, the mounting operation of the sliding member is facilitated.
Moreover, according to this invention, it becomes possible to suppress that a sheet | seat enlarges because a standing wall part spreads in the width direction of a sheet | seat.
In addition, according to the present invention, the rigidity of the sensor main body receiving portion is ensured, and the deformed portion is stably pressed against the sensor main body receiving portion.
Further , according to the present invention, since the area of the inner peripheral surface of the insertion hole against which the deformable portion presses is widened by an amount corresponding to the annular portion, the deformable portion can easily press against the inner peripheral surface of the insertion hole, and The load is easily transmitted.
Further , according to the present invention, when the load measuring sensor is rotated by the load input from the load input portion and the deformed portion presses against the inner peripheral surface of the insertion hole, first, the rigidity is increased in the annular portion. Since it is pressed against the inner peripheral surface on the base end side where the height is high, the deformed portion can be appropriately pressed against the sensor body receiving portion.
Further , according to the present invention, when the load measuring sensor is rotated by the load input from the load input portion and the deformed portion is pressed against the inner peripheral surface of the insertion hole, first, on the free end side of the annular portion. Press against the inner peripheral surface of the insertion hole. For this reason, for example, even if an excessive load is input from the load input portion, the deformed portion will press against the inner peripheral surface of the insertion hole on the free end side of the annular portion. It is possible to absorb the above-mentioned excessive load by deflecting and deforming and releasing the impact load generated by the collision between the deformed portion and the annular portion.
Further , according to the present invention, when the end of the base member protruding from the annular portion is caulked to form a flange at one end portion in the sliding direction of the sliding member, the tip of the annular portion is A margin can be secured by the amount of protrusion beyond the outer edge of the part.
In addition, according to the present invention, since all the portion to which the load is transmitted is surrounded by the annular portion in the annular portion, the portion to which the load is transmitted among the annular portion is surely attached to the annular portion. The load is reliably transmitted.
Further , according to the present invention, the support rigidity with respect to the load measuring sensor is improved, and the load measuring sensor can be stably arranged at the mounting position.

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 component diagram which shows each of the components for sensor attachment. It is the elements on larger scale of the attachment structure of a load measurement sensor. It is a figure which shows the state of the load measurement sensor when a load arises, and its periphery. It is a figure which shows the 1st modification of the attachment structure of a load measurement sensor. It is a figure which shows the 2nd modification of the attachment structure of a load measurement sensor. It is a figure which shows the vehicle seat disclosed by patent document 1. FIG. It is a figure which shows the attachment structure of the load measurement sensor disclosed by patent document 1. FIG.

  Hereinafter, a load measuring 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. 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. 6 and 7 are perspective views showing the side frame, FIG. 6 shows the inner surface of the side frame, and FIG. 7 shows the outer surface of the side frame. FIG. 8 is a perspective view showing a rail mechanism. FIG. 9 is a component diagram showing each of the sensor mounting components. FIG. 10 is a partially enlarged view of the load measuring sensor mounting structure. FIG. 11 is a diagram illustrating a state of the load measuring sensor and its surroundings when a load is generated. FIG. 12 is a view showing a first modification of the load measuring sensor mounting structure. FIG. 13 is a diagram illustrating a second modification of the load measurement sensor mounting structure.

  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 (hereinafter also simply referred to as the width direction) is the left-right direction when facing the front of the vehicle, and corresponds to the horizontal direction. Further, in FIG. 4, for convenience of illustration, illustration of a sensor mounting component 40 described later is omitted. Moreover, in FIG. 11, in order to explain the state of the load measurement sensor when a load is generated in an easy-to-understand manner, the inclination and the like of the load measurement sensor are somewhat exaggerated.

<< Vehicle seat structure >>
The vehicle seat Z of the present embodiment is an example of a seat, and includes a load measurement sensor (hereinafter, sensor 30) for measuring a load applied to the vehicle seat Z at a predetermined mounting position. The sensor 30 mainly measures a load when an occupant is seated on the vehicle seat Z as a load applied to the vehicle seat Z. In addition to this, a load, a foreign object, or the like is placed on the vehicle seat Z. It is also possible to measure the load at the time. Then, when the sensor 30 outputs an electric signal indicating the measurement result of the load, on the receiver side (not shown) that receives the signal, the presence or absence of the occupant and the occupant is an adult or a child based on the signal. Such a determination is made.

  The vehicle seat Z constitutes a seat unit S together with a rail mechanism 10 positioned below the vehicle seat Z, and is fixed to the vehicle body floor of the vehicle. The vehicle seat Z includes a seat frame F (see FIGS. 2 and 3) and a cushion body. The seat frame F includes a seating frame 2 including side frames 2a at both ends in the width direction, and includes a seat back frame 1 on the back side.

  Each side frame 2a of the seating frame 2 is a long bracket extending in the front-rear direction, and is connected to the seat back frame 1 at the rear end. One side frame 2a and the other side frame 2a are spaced apart in the width direction in a state of being parallel to each other. The side frames 2a are connected to each other via a connecting pipe 3 on the rear end side and a submarine suppressing pipe 4 on the front end side (see FIG. 4).

  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 on the connection pipe 3 from the installation pan 5 installed between the side frames 2a.

Furthermore, in this embodiment, the sensor 30 is attached to the front end part and the rear end part of each side frame 2a. In other words, in the present embodiment, each side frame 2 a corresponds to an attachment member provided on the vehicle seat Z for attaching the sensor 30. In this embodiment, since the sensor 30 is attached to the side frame 2a having relatively high rigidity in the seat frame F, the support rigidity with respect to the sensor 30 is improved, and the sensor 30 is stably disposed at the attachment position. It becomes possible.
A circular hole 21 formed for attaching the extension shaft 31 of the sensor 30 is formed at the front end and the rear end of each side frame 2a, and the other side frames 2a. The structure of will be described in detail later.

  A pair of rail mechanisms 10 are provided, and each of them is separated in the width direction in a state of being parallel to each other. As shown in FIG. 4, each rail mechanism 10 extends along the front-rear direction, and can slide on the lower rail 11, which is a rail member fixed to the vehicle body floor, and on the lower rail 11. It has the upper rail 12 which is a rail member. The pair of upper rails 12 are arranged in parallel with each other at an interval in the width direction, and are connected by a slide lever 17 therebetween. The pair of lower rails 11 are also arranged in parallel with each other at an interval in the width direction, and are connected by a member frame 14 therebetween. A support bracket 13 is attached to each lower surface of the lower rail 11, and the lower rail 11 is fixed to the vehicle body floor via the support bracket 13.

  Further, as shown in FIG. 4, among the upper end surfaces of the upper rails 12, a front sensor receiving bracket 65 is provided at the front end portion, and a rear sensor receiving bracket 66 is provided at the rear end portion by bolts and nuts. It is fixed. An insertion hole 62 is formed in each of the sensor receiving brackets 65 and 66, and the extending shaft portion 31 of the sensor 30 is inserted into the insertion hole 62.

Then, in a state where the insertion hole 62 formed in the sensor receiving brackets 65 and 66 and the hole portion 21 formed in the side frame 2a overlap each other, the extending shaft portion 31 of the sensor 30 is inserted into both of these holes. Then, the sensor receiving brackets 65 and 66 and the side frame 2 a are connected via the extending shaft portion 31 of the sensor 30. As a result, the vehicle seat Z is attached to the upper rail 12 and placed on the rail mechanism 10.
In the state where the vehicle seat Z is placed on the rail mechanism 10, the pair of side frames 2a are positioned outside the sensor receiving brackets 65 and 66 in the width direction as shown in FIGS. 30 sensor bodies 32 are located inside the sensor receiving brackets 65 and 66.

  In the present embodiment, the sensor receiving brackets 65 and 66 are fixed to the upper surface of the upper rail 12. However, as another configuration, the sensor receiving brackets 65 and 66 may be attached to the side surface of the upper rail 12. Such a configuration is preferable in that the sheet unit S is prevented from being enlarged in the vertical direction. More preferably, the sensor receiving brackets 65 and 66 are connected and integrated, and the integrated sensor receiving bracket may be joined from the front end to the rear end of the side surface of the upper rail 12. In such a configuration, the support rigidity with respect to the sensor receiving bracket is improved. Furthermore, if the sensor receiving brackets 65 and 66 are arranged in the space between the lower rail 11 and the upper rail 12 in the width direction, it is possible to suppress an increase in the size of the seat unit S in the width direction.

<< Sensor structure >>
Next, the structure of the sensor 30 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 5, the sensor 30 includes a sensor body 32 and an extending shaft portion 31 that extends from one end of the sensor body 32. In this embodiment, the extension shaft part 31 is comprised in the edge part by which the external thread was formed among the metal shaft bodies 33 by which the external thread was formed in the one end part. On the other hand, the sensor body 32 includes a large-diameter portion formed in the middle position of the shaft body 33, an outer cylinder body through which the shaft body 33 is inserted, and a substrate unit 34. The shaft body 33 is integrated with the outer cylinder body by attaching the end portion thereof (the end portion opposite to the side where the extending shaft section 31 is formed) to the outer cylinder body. It has become.

  The extension shaft portion 31 corresponds to an extension portion, is a bolt-shaped portion provided for attaching the sensor 30 to the seat unit S, and extends from one end of the sensor main body 32. The extension shaft portion 31 is formed on the shaft body 33, and has a male screw portion 31a formed at the tip of the shaft body 33 and a columnar adjacent portion adjacent to the male screw portion 31a in the axial direction. 31b. The portion corresponding to the thread of the male screw portion 31a and the adjacent portion 31b have the same diameter. In the present embodiment, the male screw portion 31a is formed on the extension shaft portion 31, but a female screw may be formed.

  The sensor main body 32 is a main part of the sensor 30, and is a part 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 in the width direction, a load detection unit 37 that deforms to detect a load, and a substrate unit 34 that outputs a measurement result of the load as an electrical signal. Have.

  The positioning part 35 is a hook-like part adjacent to the adjacent part 31b on the opposite side to the male thread part 31a in the shaft body 33 described above. The positioning portion 35 has a somewhat larger outer diameter than the male screw portion 31a and the adjacent portion 31b. Therefore, when the extending shaft portion 31 is inserted into the insertion hole 62 formed in the standing wall portion 61 of the sensor receiving bracket 65, 66 and the positioning portion 35 is brought into contact with the standing wall portion 61, the sensor 30 is positioned in the width direction. Become so.

  The load detection unit 37 corresponds to a deformation unit, and is a portion that is deformed according to the magnitude of the load when an occupant sits on the vehicle seat Z and a load is generated. More specifically, the load detection unit 37 is an annular part provided at an end on the opening end side of the outer cylinder constituting the sensor main body 32. Of the annular portion, the end portion on the free end side is inserted into an insertion hole 62 formed in the standing wall portion 61 of the sensor receiving brackets 65 and 66 in a state where the sensor 30 is attached to the attachment position.

  When an occupant sits on the vehicle seat Z and a load is generated, the annular portion that is the load detection portion 37 is deformed so as to be distorted inward in the radial direction of the annular portion by pressing against the sensor receiving brackets 65 and 66. To do. The sensor body 32 detects the deformation amount of the load detection unit 37 by a strain sensor (not shown), and calculates the magnitude of the load from the deformation amount. The central axis direction of the annular portion coincides with the axial direction of the extended shaft portion 31.

  Further, the sensor main body 32 has 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. The housing shaft portion 36 corresponds to an inner portion and is located on the radially inner side of the above-described annular portion. As shown in FIG. 5, the housing shaft portion 36 has the same diameter portion 36 a adjacent to the positioning portion 35, and the different diameter portion 36 b adjacent to the same diameter portion 36 a on the side opposite to the positioning portion 35. The same diameter portion 36a is a portion having the largest outer diameter in the housing shaft portion 36, and the outer diameter is slightly smaller than the inner diameter of the annular portion. The different diameter portion 36b is reduced in diameter on the same diameter portion 36a side and expanded again on the base side. In addition, the same diameter part 36a is corresponded to an inner side large diameter area | region, and the part diameter-reduced by the same diameter part 36a side among the different diameter parts 36b is equivalent to an inner side small diameter area | region.

  As shown in FIG. 5, the sensor 30 having the above-described configuration is attached so that the extending shaft portion 31 is positioned on the side of the sensor main body 32. More specifically, when the sensor 30 is attached to a predetermined attachment position, the hole portion 21 formed in the side frame 2a and the insertion hole 62 formed in the sensor receiving brackets 65 and 66 are overlapped. The extending shaft portion 31 of the sensor 30 is inserted from the inside of the sensor receiving brackets 65 and 66. As a result, the positioning portion 35 comes into contact with the standing wall portion 61 of the sensor receiving brackets 65 and 66, and the end portion on the free end side of the annular portion which is the load detection portion 37 enters the insertion hole 62 of the sensor receiving brackets 65 and 66. Loosely inserted.

  Furthermore, the male screw portion 31a of the extending shaft portion 31 projects from the hole portion 21 of the side frame 2a to the outside of the side frame 2a, and the nut 39 is screwed into the male screw portion 31a. As a result of the extension shaft portion 31 being fastened to the side frame 2a in this way, the sensor 30 is attached to the side frame 2a. As described above, the attached sensor 30 has a posture in which the axial direction of the extending shaft portion 31 is in the horizontal direction, specifically, the width direction of the vehicle seat Z. The attached sensor 30 is held in a cantilever state, more specifically, in a state where the side opposite to the extending shaft portion 31 is a free end.

When the occupant sits on the vehicle seat Z with the sensor 30 attached, the load at that time (indicated by an arrow with a symbol F in FIG. 11) is applied to the side frame 2a and the sensor receiving bracket 65, This is transmitted to the load detection unit 37 via 66.
More specifically, when an occupant sits on the vehicle seat Z, the load causes the side frame 2a to press the upper end portion of the adjacent portion 31b of the extending shaft portion 31 downward on the inner peripheral surface of the hole portion 21. To come. This pressing force corresponds to a load generated when an occupant sits on the vehicle seat Z. In this sense, the portion of the side frame 2 a where the hole 21 is formed corresponds to a load input portion that contacts the sensor 30 and inputs a load to the sensor 30.

  When a pressing force from the side frame 2a, that is, a load generated when an occupant sits on the vehicle seat Z is input, the sensor 30 moves. More specifically, a rotational moment is generated in the sensor 30 due to an input load from the side frame 2a. As a result, the sensor 30 rotates around a predetermined position as shown in FIG. The rotation fulcrum of the sensor 30 is, for example, the apex of the upper end corner of the positioning unit 35 on the side in contact with the side frame 2a. Since the sensor 30 rotates around the rotation fulcrum, the circumferential upper part of the annular portion of the sensor body 32 is formed on the sensor receiving brackets 65 and 66, particularly the standing wall portion 61 via a sliding member 42 described later. The insertion hole 62 is pressed against the inner peripheral surface. In this sense, the portion of the standing wall portion 61 of the sensor receiving brackets 65 and 66 where the insertion hole 62 is formed is pressed by the sensor body 32 when the sensor 30 is rotated by the input load from the side frame 2a. The sensor main body receiving portion is configured.

  Then, when the circumferential upper portion of the annular portion provided as the load detecting portion 37 of the sensor main body 32 presses against the standing wall portion 61 of the sensor receiving brackets 65 and 66, the reaction force causes the above-mentioned as shown in FIG. The end portion on the free end side of the annular portion is distorted so as to fall inward in the radial direction. The sensor body 32 detects the load based on the distortion of the annular portion, and the sensor 30 measures the magnitude of the load based on the distortion amount of the annular portion.

  As described above, in this embodiment, when an occupant sits on the vehicle seat Z, the load is input from the side frame 2a to the extending shaft portion 31 of the sensor 30, and accordingly, the sensor 30 rotates around a predetermined position as a fulcrum. Move. As a result, the annular portion which is the load detecting portion 37 is deformed so as to be pressed against the standing wall portion 61 of the sensor receiving brackets 65 and 66 and distorted radially inward. That is, in the present embodiment, the load is transmitted to the load detection unit 37 through the rotation operation of the side frame 2a, the sensor receiving brackets 65 and 66, and the sensor 30 itself. And among the edge parts by the side of the free end in the outer peripheral surface of an annular part, the circumferential direction upper part is equivalent to the load receiving surface 37a which receives a load.

  In addition, the same diameter part 36a of the accommodation shaft part 36 mentioned above is arranged on the inner side in the radial direction of the annular part, and the end part on the free end side of the annular part is distorted inward in the radial direction by the load. When the amount of strain reaches a predetermined amount, the same-diameter portion 36a comes into contact with the annular portion and restricts further strain deformation. In other words, in the present embodiment, the restriction that regulates the deformation amount of the annular portion of the same-diameter portion 36a that abuts when the annular portion that is the load detection portion 37 is deformed so as to be distorted radially inward. It corresponds to the part.

  More specifically, among the same-diameter portion 36a of the housing shaft portion 36, the region corresponding to the restricting portion is a region that comes into contact with the annular portion when the annular portion is distorted inward in the radial direction. The portion 31 has a certain spread in the axial direction. By arranging such a restricting portion inside the annular portion, it is possible to suppress the annular portion from being excessively deformed due to an offset load or the like, so that the sensor 30 stably performs load measurement. become. In addition, in the range which presses against the sensor receiving brackets 65 and 66 among the annular parts, the same diameter part 36a exists inside thereof. Therefore, the same diameter portion 36a receives the annular portion over the entire range where the sensor receiving brackets 65 and 66 are pressed. As a result, in the present embodiment, more stable load measurement can be performed.

  Furthermore, the same-diameter portion 36a according to the present embodiment is provided with regions present on both sides of the restricting portion, and foreign matter enters between the annular portion and the housing shaft portion 36 in the region. It functions as a foreign matter intrusion suppression unit that suppresses That is, in this embodiment, the restricting portion that restricts excessive deformation of the annular portion and the foreign matter intrusion suppressing portion that suppresses the intrusion of foreign matters between the annular portion and the housing shaft portion 36 are provided as one member. Since it is formed, the number of parts is reduced as compared with the case where the restricting portion and the foreign matter intrusion suppressing portion are formed of separate members.

<< Sensor mounting structure >>
As described above, the sensor 30 is attached to the vehicle seat Z so as to connect between the side frame 2a and the sensor receiving brackets 65 and 66. In other words, the sensor 30 is attached to the vehicle seat Z so as to straddle the side frame 2a and the sensor receiving brackets 65 and 66.
Below, the attachment structure for attaching the sensor 30 as mentioned above 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 in the width direction of the vehicle seat Z will be described in the following description.

In describing the mounting structure of the sensor 30, the structures of the side frame 2a and the sensor receiving brackets 65 and 66 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, a circular hole portion 21 for attaching the sensor 30 is provided at a position somewhat rearward of the front end of the side frame 2a and a position slightly forward of the rear end. . The extension shaft portion 31 of the sensor 30 is inserted into the hole portion 21, and the adjacent portion 31 b of the extension shaft portion 31 is loosely inserted into the hole portion 21 in a state where the sensor 30 is attached to the attachment position. It is.

  Further, as shown in FIGS. 6 and 7, a predetermined region of the side frame 2a is recessed inward, and other regions protrude outward. More specifically, the connection region 22 located at the rear end portion and connected to the seat back frame in the side frame 2a is located on the innermost side in the side frame 2a. Further, the rear attachment region 23 that is in front of the connection region 22 and in which the rear hole portion 21 is formed protrudes somewhat outside the connection region 22, and in particular, near the boundary with the connection region 22. Is protruding further out. Furthermore, the front attachment region 25 that is located behind the front end region 24 of the side frame 2a and in which the front hole 21 is formed protrudes outward from the front end region 24 and the connection region 22 described above.

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

  Further, as shown in FIG. 7, a projecting portion 23 a projecting downward is formed in the lower portion of the rear attachment region 23. Similarly, a projecting portion 25a projecting downward is also formed in the lower portion of the front attachment region 25. That is, in the side frame 2a, in the rear attachment region 23 and the front attachment region 25, the length in the vertical direction is longer than the other regions because the overhang portions 23a and 25a are formed. And the hole part 21 is formed in each overhang | projection part 23a, 25a.

Next, the sensor receiving brackets 65 and 66 will be described.
The sensor receiving brackets 65 and 66 are separate from the upper rail 12 and extend along the front-rear direction of the vehicle seat Z. The sensor receiving brackets 65 and 66 are detachably attached to the upper surface of the upper rail 12 by a bolt that is an example of a fastening member. It is fixed. As described above, since the sensor receiving brackets 65 and 66 for attaching the sensor 30 are separated from the upper rail 12, the sensor 30 can be easily reattached even when the seat design is changed. For example, the versatility of the mounting structure of the sensor 30 is improved, and the maintainability is also improved.

  The sensor receiving brackets 65 and 66 may be integrated with the lower rail 11 or the upper rail 12. For example, a part of members constituting the lower rail 11 or the upper rail 12, more specifically, the upper end portion is a sensor. The receiving brackets 65 and 66 may be formed. In other words, the sensor receiving brackets 65 and 66 may constitute at least a part of a rail member on which the vehicle seat Z is placed. With such a configuration, a part of the rail member having a relatively high rigidity is used as the sensor receiving brackets 65 and 66. As a result, the rigidity of the sensor receiving brackets 65 and 66 is ensured. Is stably pressed against the sensor receiving brackets 65 and 66.

  In the present embodiment, a front sensor receiving bracket 65 is installed at the front end of the upper rail 12, and a rear sensor receiving bracket 66 is installed at the rear end of the upper rail 12. Since the two sensor receiving brackets 65 and 66 are thus separated in the front-rear direction of the vehicle seat Z, the arrangement of the individual sensor receiving brackets 65 and 66 can be individually adjusted. Therefore, the bracket position adjustment accuracy is improved. However, it is not limited to this, the sensor receiving bracket is integrated without being divided in the front and rear, the front sensor receiving brackets 65 and the rear sensor receiving brackets 66 are connected, The structure which combined the said structure may be sufficient. With this configuration, the rigidity of the sensor receiving brackets 65 and 66 is improved.

  Here, although the front sensor receiving bracket 65 and the rear sensor receiving bracket 66 have different lengths in the front-rear direction, their basic structures are substantially the same. Only the structure will be explained.

  As shown in FIG. 8, the sensor receiving bracket 65 includes a bottom wall portion 60 that is placed on the upper surface of the upper rail 12, and a standing wall that is erected substantially vertically from the outer end in the width direction of the bottom wall portion 60. Part 61. The insertion hole 62 is formed in the standing wall portion 61 as described above, and an annular portion provided as the load detection unit 37 in the sensor 30 is loosely inserted into the insertion hole 62.

  In the present embodiment, burring is performed on the outer edge portion of the insertion hole 62 in the standing wall portion 61. Thereby, the outer edge part of the insertion hole 62 among the standing wall parts 61 bends in the ring shape, and the annular part 63 is formed. That is, the annular portion 63 is formed with an insertion hole 62 on the inside of the standing wall portion 61 and protrudes somewhat toward the outside in the width direction, that is, the side where the nearest side frame 2a is disposed. It is the part that was done. Therefore, in the present embodiment, the length of the insertion hole 62 in the width direction is longer as the annular portion 63 is formed.

  Moreover, in this embodiment, the part bent in order to form the annular part 63 among the standing wall parts 61 is bent in R shape as shown in FIG. That is, the opening edge part of the insertion hole 62 located on the opposite side of the standing wall part 62 from the side where the annular part 63 is provided is chamfered and rounded.

  In the present embodiment, a portion of the standing wall portion 61 that is located below the insertion hole 62 extends substantially straight along the vertical direction toward the vehicle body floor, that is, downward. Thereby, in this embodiment, it becomes possible to suppress that the vehicle seat Z enlarges because the standing wall part 61 spreads in the width direction.

  The side frame 2a and the sensor receiving brackets 65 and 66 described so far form the sensor 30 mounting structure of the present embodiment. More specifically, the vehicle seat Z is placed on the rail mechanism 10 so that the standing wall portions 61 of the sensor receiving brackets 65 and 66 are aligned with the side frame 2a inside the side frame 2a. At this time, the insertion holes 62 formed in the sensor receiving brackets 65 and 66 and the corresponding hole portions 21 among the hole portions 21 formed in the side frame 2a are overlapped so as to communicate with each other.

  The extension shaft portion 31 of the sensor 30 is inserted into the two holes in the overlapped state from the inside of the standing wall portion 61 of the sensor receiving brackets 65 and 66. The sensor 30 is inserted until the positioning portion 35 provided in the sensor main body 32 comes into contact with the inner surface of the standing wall portion 61. Thereby, the sensor 30 comes to be positioned in the width direction.

  At the time when the sensor 30 is positioned, the annular portion that is the load detection portion 37 of the sensor body 32 is loosely inserted into the insertion hole 62 formed in the standing wall portion 61 of the sensor receiving brackets 65 and 66. . At the same time, the male screw portion 31a of the extending shaft portion 31 protrudes outward from the hole portion 21 of the side frame 2a, and the adjacent portion 31b is fitted into the hole portion 21. As described above, the nut 39 is screwed into the male screw portion 31a protruding from the hole portion 21 of the side frame 2a, and the extending shaft portion 31 is fastened to the side frame 2a. As a result, the sensor 30 is attached to the side frame 2a.

  When the sensor 30 is attached to the side frame 2a, the part where the hole 21 is formed in the side frame 2a and the part where the insertion hole 62 is formed in the sensor receiving brackets 65 and 66 are connected by the sensor 30. become. That is, when the sensor 30 is attached to the side frame 2a, the portion where the hole portion 21 of the side frame 2a is formed and the portion where the insertion hole 62 of the sensor receiving brackets 65 and 66 is formed are the extension shaft portion 31. Are separated from each other in the axial direction, and the sensor 30 is interposed therebetween.

  Here, as described above, the portion of the side frame 2a in which the hole 21 is formed corresponds to a load input portion that inputs a load generated when an occupant sits on the vehicle seat Z to the sensor 30. On the other hand, the portion of the sensor receiving bracket 65, 66 where the insertion hole 62 is formed corresponds to a sensor main body receiving portion to which the annular portion of the sensor main body 32 is pressed when the sensor 30 is rotated by the load. That is, in the present embodiment, in a state where the sensor 30 is attached to the side frame 2 a, the load input portion and the sensor main body receiving portion are separated from each other in the axial direction of the extending shaft portion 31.

As described above, when the sensor 30 is attached to the side frame 2a, the load input portion and the sensor main body receiving portion are separated from each other in the axial direction of the extending shaft portion 31, thereby the sensor from the load input portion. When a load is input to the sensor 30, the sensor 30 rotates. As the sensor 30 rotates, the free end of the annular portion of the sensor body 32 hits the sensor body receiving portion, and as a result, the free end of the annular portion is radially inward. Deforms to distort. That is, the load input from the load input unit is appropriately transmitted to the annular part by moving the annular part to a position where it is pressed against the sensor body receiving part as the sensor 30 rotates. At this time, even if the load input from the load input portion is very small, the load is appropriately transmitted from the load input portion to the annular portion by the lever principle.
With the above operation, in this embodiment, the input load from the load input unit can be appropriately transmitted to the load detection unit 37, and thus the load can be accurately detected and measured.

  When the sensor 30 is attached to the side frame 2a, the portion of the side frame 2a in which the hole 21 is formed is supported by the sensor receiving bracket 65, 66 when viewed from the nearest sensor receiving bracket 65, 66. It is located on the opposite side of the sensor body 32. That is, in the present embodiment, the load input portion is located on the side opposite to the sensor main body 32 when viewed from the sensor main body receiving portion in the axial direction of the extending shaft portion 31. In such a positional relationship, since the load input unit is separated from the sensor main body 32, even if an excessive load is input from the load input unit, the excessive load does not directly act on the sensor main body 32, and the sensor The main body 32 can be protected.

  Further, as described above, when the sensor 30 is rotated by the load when the occupant is seated on the vehicle seat Z, the annular portion of the sensor main body 32 is inserted into the standing wall portion 61 of the sensor receiving brackets 65 and 66. It presses against the inner peripheral surface of the hole 62 via a sliding member 42 described later. Here, in the present embodiment, an annular portion 63 formed by burring is provided in a portion where the insertion hole 62 is formed in the standing wall portion 61. That is, in the present embodiment, the area of the inner peripheral surface of the insertion hole 62 is increased by the annular portion 63. As a result, the annular portion is easily pressed against the inner peripheral surface of the insertion hole 62, and as a result, the load is easily transmitted to the deformed portion. That is, the annular portion 63 is a portion formed to increase the area when the annular portion of the sensor body 32 is pressed against the inner peripheral surface of the insertion hole 62.

  Furthermore, in this embodiment, said annular part 63 protrudes toward the side frame 2a side, ie, the side where the load input part is located, in the width direction. With this configuration, when the sensor 30 is rotated by the input load and the annular portion of the sensor body 32 is pressed against the inner peripheral surface of the insertion hole 62, first, as shown in FIG. Thus, it comes to press against the inner peripheral surface on the base end side having relatively high rigidity. As a result, the annular portion comes to properly press against the inner peripheral surface of the insertion hole 62.

  When the annular portion is pressed against the inner peripheral surface of the insertion hole 62 by the rotation of the sensor 30, the contact surface of the annular portion, that is, the load receiving surface 37a is inclined with respect to the central axis of the annular portion. In contact with the inner peripheral surface of the insertion hole 62. Here, in order to increase the area in contact with the inner peripheral surface of the insertion hole 62 on the load receiving surface 37a and more efficiently press the annular portion against the inner peripheral surface of the insertion hole 62, as shown in FIG. The inner peripheral surface of the insertion hole 62 is set to the center axis of the annular portion so as to correspond to the inclination of the load receiving surface 37a by, for example, making the shape of the portion 63 tapered so as to reduce the diameter toward the free end side. It may be a tilted surface.

  In the present embodiment, the annular portion 63 protrudes toward the side frame 2a in the width direction of the vehicle seat Z, but as shown in FIG. That is, it is good also as projecting toward the opposite side to the side where a load input part is located. In such a configuration, when the sensor 30 is rotated by the load input from the load input portion and the annular portion of the sensor main body 32 presses against the inner peripheral surface of the insertion hole 62, first, the free end side of the annular portion 63. Thus, it comes into contact with the inner peripheral surface of the insertion hole 62. Thereby, for example, even if an excessive load is input from the load input portion, the annular portion presses against the inner peripheral surface of the insertion hole 62 on the free end side of the annular portion 63, and at that time, the free end portion is It becomes possible to absorb the above-mentioned excessive load by releasing the impact load caused by the bending deformation and the collision between the annular portion and the annular portion 63.

  By the way, in the state where the sensor 30 is attached to the side frame 2a, the same-diameter portion 36a of the housing shaft portion 36 is disposed inside the annular portion, and a part thereof restricts excessive deformation of the annular portion. It constitutes a regulation part. Further, a region of the accommodation shaft portion 36 adjacent to the same diameter portion 36a is provided with a reduced diameter portion of the different diameter portions 36b, and a part of the reduced diameter portion is disposed in the annular portion.

  On the other hand, in a state where the sensor 30 is attached to the side frame 2a, the annular portion is loosely inserted into the insertion hole 62 formed in the standing wall portion 61 of the sensor receiving brackets 65 and 66. In the case of the present embodiment, in the state where the sensor 30 is attached to the side frame 2a, a part of the reduced diameter portion of the same diameter portion 36a and the different diameter portion 36b is disposed in the insertion hole 62. . In other words, the length of the insertion hole 62 is set such that when the sensor 30 is attached to the side frame 2a, the entire same-diameter portion 36a is within the range from one end to the other end of the insertion hole 62. With such a configuration, the entire portion of the annular portion that is distorted inward in the radial direction and contacts the same-diameter portion 36 a is surrounded by the annular portion 63. Thereby, since the annular part 63 hits the part which is distorted when the load is transmitted in the annular part, the load is reliably transmitted.

  When the sensor 30 is attached to the side frame 2a, the upper ends of the sensor receiving brackets 65 and 66 are attached to the sensor 30 and the sensor mounting part 40, specifically, a spacer 41, a sliding member 42, and a washer 44 described later. It is located above. As described above, if the sensor receiving brackets 65 and 66 are configured to be taller than the sensor 30 and the sensor mounting component 40 that are the supported bodies, the support rigidity with respect to these supported bodies is improved.

<< Sensor mounting parts >>
In the present embodiment, for the purpose of realizing a good load measurement, a sensor mounting part 40 for appropriately mounting the sensor 30 at the mounting position is provided. As shown in FIG. 5, the sensor mounting component 40 is arranged in the order of the spacer 41, the sliding member 42, and the washer 44 from the outer side in the width direction, and these component sets are provided for each sensor 30. Of the sensor mounting component 40, the sliding member 42 is fitted into the insertion hole 62 formed in the standing wall portion 61 of the sensor receiving bracket 65, 66 and constitutes a sensor body receiving portion together with the sensor receiving bracket 65, 66. .

  More specifically, the sliding member 42 is the cylindrical body illustrated in FIG. 9, and the sensor is in a state where the center portion in the central axis direction is inserted into the insertion hole 62 of the sensor receiving bracket 65, 66. The brackets 65 and 66 are attached. At this time, the sliding member 42 is attached to the sensor receiving brackets 65 and 66 so that the central axis direction of the sliding member 42 coincides with the width direction of the vehicle seat Z.

  Further, in a state where the sensor 30 is attached to the side frame 2a, the through hole 42d formed in the sliding member 42 has an annular portion of the sensor main body 32, more specifically, from the free end of the annular portion to the proximal end. The portion up to a position slightly closer to the front is fitted. In other words, in a state where the sensor 30 is attached to the side frame 2a, the sliding member 42 is interposed between the annular portion and the inner peripheral surface of the insertion hole 62 in the radial direction of the annular portion.

  Then, the sensor 30 is rotated by the load when the occupant is seated on the vehicle seat Z, and the annular portion as the load detecting portion 37 is pushed to the inner peripheral surface of the insertion hole 62 of the sensor receiving brackets 65 and 66. When hitting, the sliding member 42 contacts the outer periphery of the annular portion. That is, the annular portion presses against the inner peripheral surface of the insertion hole 62 via the sliding member 42. In other words, the sliding member 42 inputs the load from the vehicle seat Z through the inner peripheral surface that is in contact with the annular portion of the sensor body 32, and the inside of the through hole 42 d formed in the sliding member 42. The peripheral surface corresponds to a load input surface.

  Further, when the annular portion presses against the inner peripheral surface of the insertion hole 62 via the sliding member 42, the sliding member 42 moves between the spacer 41 and the washer 44 so that the outer peripheral surface of the annular portion is moved. Slide on the top. That is, when the annular portion presses against the inner peripheral surface of the insertion hole 62 by the rotation of the sensor 30, the sliding member 42 contacts the outer periphery of the annular portion and slides on the outer peripheral surface of the annular portion. . More specifically, when the free end portion of the annular portion presses against the inner peripheral surface of the insertion hole 62 and is distorted radially inward, the sliding member 42 follows the distortion deformation in the width direction. It slides to the outside, that is, the side frame 2a side. As described above, the sliding member 42 slides outward in the width direction, so that the annular portion receives the load on the side frame 2 a side where the fixed end of the sensor 30 is located. As a result, since the load is stably transmitted to the annular portion, the detection accuracy is improved.

  Further, in a state where the sensor 30 is attached to the side frame 2a, the sliding member 42 is disposed so as to straddle the free end of the annular portion in the width direction. As a result, when the annular portion is pressed against the inner peripheral surface of the insertion hole 62 via the sliding member 42, the annular portion is satisfactorily deformed and deformed, and as a result, load detection accuracy is improved.

  As shown in FIG. 9, the sliding member 42 having the above function includes a cylindrical fitting tube portion 42 b provided at the central portion in the central axis direction, and flange portions 42 a provided at both ends in the central axial direction. 42c. Note that the direction of the central axis of the sliding member 42 coincides with the sliding direction of the sliding member 42. When the sliding member 42 is attached to the sensor receiving brackets 65 and 66, the fitting cylinder portion 42b is inserted into the insertion hole 62, and the one end side flange portion 42a in the central axis direction is the annular portion 63 in the width direction. The other end side flange portion 42c in the central axis direction is adjacent to the inner surface of the standing wall portion 61, and is adjacent to the free end portion outside the free end portion. That is, when the sliding member 42 is attached to the sensor receiving brackets 65 and 66, the portion of the standing wall portion 61 of the sensor receiving brackets 65 and 66 where the insertion hole 62 is formed is sandwiched between the two flange portions 42a and 42c. become.

  Further, the sliding member 42 according to the present embodiment is formed so that the one end side flange portion 42a and the other end side flange portion 42c are symmetrical, and the two flange portions 42a, 42c have substantially the same diameter. It has become. As a result, it is possible to prevent the force acting on the flange portions 42a and 42c from becoming unbalanced between the flange portions 42a and 42c when the annular portion of the sensor main body 32 contacts the sliding member 42. Become. Furthermore, as long as the one end side collar part 42a and the other end side collar part 42c are symmetrical, the sliding member 42 may be attached from either end side when attaching to the annular part. Installation work becomes easy.

  The attachment of the sliding member 42 will be described. A substantially cylindrical base material is inserted into the insertion holes 62 of the sensor receiving brackets 65 and 66, and both ends of the base material are protruded from the insertion holes 62. Caulking is performed on each of both end portions of. By the above procedure, the sliding member 42 having the flange portions 42a and 42c at both ends is completed, and the sliding member 42 is assembled to the standing wall portion 61 of the sensor receiving brackets 65 and 66. When the sliding member 42 is assembled to the sensor receiving brackets 65 and 66, the outer edge of the free end portion of the annular portion 63 is positioned inside the outer edge of the one end side flange portion 42a. Thereby, at the time of performing the above-described caulking process, the margin margin can be ensured by the amount of protruding from the outer edge of the free end portion of the annular portion 63 at the one end side flange portion 42a.

  In the state where the sliding member 42 is attached to the sensor receiving brackets 65 and 66, as described above, the portion of the standing wall portion 61 of the sensor receiving brackets 65 and 66 where the insertion hole 62 is formed has two flanges. It comes to be sandwiched between the parts 42a and 42c. More specifically, as shown in FIG. 10, the one end side collar portion 42 a is joined to the annular portion 63 by contacting with the free end of the annular portion 63 without a gap.

  On the other hand, the other end side flange portion 42c is in contact with the vertical inner surface of the standing wall portion 61 and joined to the standing wall portion 61, but at the corner portion formed by the other end side flange portion 42c and the fitting cylinder portion 42b. A gap is formed between the upright wall portion 61 and the upright wall portion 61. As described above, this is because, in the standing wall portion 61, the opening edge portion of the insertion hole 62 is bent in an R shape and protrudes toward the side frame 2a to form the annular portion 63. Therefore, the other end side flange portion 42c is joined to a portion of the standing wall portion 61 that is located on the radially outer side from the bending start point when bent in an R shape. Thereby, the other end side collar part 42c comes to be appropriately joined to the standing wall part 61.

  In the state in which the sensor 30 is attached to the side frame 2a, as shown in FIG. 10, in the axial direction of the extending shaft portion 31, the housing shaft portion 36 is located at a position inside the both ends of the sliding member 42. The diameter portion 36a is arranged. Thus, when the annular portion of the sensor body 32 is pressed against the sensor receiving brackets 65 and 66 via the sliding member 42, the same diameter portion 36a exists on the opposite side of the sliding member 42 across the annular portion. Therefore, the load is stably transmitted to the annular portion.

  Further, in the state where the sensor 30 is attached to the side frame 2a, as shown in FIG. 10, the sensor 30 is formed between the positioning portion 35 of the sensor main body 32 and the annular portion in the axial direction of the extending shaft portion 31. The sliding member 42 is disposed so as to straddle the slit. That is, in the present embodiment, the sliding member 42 is disposed on the radially outer side of the slit. As a result, the slit is closed by the sliding member 42, so that foreign matter can be prevented from entering the slit.

  In the state where the sensor 30 is attached to the side frame 2a, the other end side flange portion 42c, the fitting cylinder portion 42b, and the R of the standing wall portion 61 in the axial direction of the extending shaft portion 31, as shown in FIG. A gap (hereinafter, referred to as a hollow portion) Vs surrounded by the bent portion reaches a boundary position between the same-diameter portion 36a and the different-diameter portion 36b of the housing shaft portion 36. That is, the hollow portion Vs and the standing wall portion 61 exist at the same position as the end of the same diameter portion 36 a in the axial direction of the extending shaft portion 31. In addition, a portion of the annular portion of the sensor main body 32 that is located at the same position as the end of the same diameter portion 36 a in the central axis direction is located on the innermost side in the width direction in the region pressed against the inner peripheral surface of the insertion hole 62. .

  On the other hand, in the present embodiment, as described above, the sensor 30 is rotated by the load when the occupant is seated on the vehicle seat Z, and the annular portion of the sensor body 32 is pressed against the inner peripheral surface of the insertion hole 62. Sometimes, the base portion of the annular portion 63 is pressed against the inner peripheral surface. More specifically, a portion of the annular portion located at the same position as the end of the same diameter portion 36 a presses against the inner peripheral surface on the proximal end side of the annular portion 63. Since the cavity portion Vs is formed on the base end side of the annular portion 63, the impact when the annular portion hits the inner peripheral surface of the insertion hole 62 is absorbed by the cavity portion Vs.

  The washer 44 is a ring member into which the annular portion of the sensor body 32 is inserted. The washer 44 is positioned on the inner side in the width direction with respect to the other end side flange portion 42c of the sliding member 42, and restricts the sliding member 42 from excessively moving to the inner side, that is, the side opposite to the side frame 2a. . That is, the washer 44 is a movement restricting member that restricts the sliding member 42 from moving inward from the position where the washer 44 is disposed. Further, in the present embodiment, as shown in FIG. 10, the end of the same diameter portion 36 a of the housing shaft portion 36, that is, the boundary position between the same diameter portion 36 a and the different diameter portion 36 b is outward in the width direction from the washer 44. positioned. Thereby, it becomes possible to suppress that the length of the same diameter part 36a in the axial direction of the accommodation shaft part 36 becomes larger than necessary. Further, the outer diameter of the washer 44 is formed larger than the outer diameter of the flange portions 42 a and 42 c of the sliding member 42. Thereby, excessive movement of the sliding member 42 can be reliably prevented by the washer 44.

  The washer 44 is not limited to the configuration provided separately from the sensor 30 (sensor body 32), and may be a configuration integrally formed with the annular portion of the sensor body 32, for example. As a result, the number of component parts is reduced, and the time required for mounting the sensor 30 can be shortened.

  The spacer 41 is a cylindrical member located between the one end side flange portion 42a of the sliding member 42 and the side frame 2a, and the sliding member 42 moves excessively outward in the width direction, that is, to the side frame 2a side. To regulate. More specifically, when the sliding member 42 fitted in the annular portion of the sensor body 32 slides outward on the outer peripheral surface of the annular portion, the spacer 41 slides. It abuts against the member 42 and restricts the sliding member 42 from falling off the annular portion. The spacer 41 is joined to the side frame 2a by projection welding in a state where the circular hole 41a formed at the center thereof and the hole 21 of the side frame 2a are concentrically overlapped. In addition, the diameter of the circular hole 41a is larger than the diameter of the hole part 21, and when the sensor 30 is attached to the side frame 2a, as shown in FIG. 10, the positioning part 35 of the sensor main body 32 is placed in the circular hole 41a. Will be placed.

  The spacer 41 is not limited to the configuration provided separately from the sensor 30 (sensor main body 32) and the sensor receiving brackets 65 and 66. For example, a part of the standing wall portion 61 of the sensor receiving brackets 65 and 66 is processed. For example, a configuration in which the upright wall portion 61 is integrally formed may be used. In such a configuration, the number of components is further reduced, and the time required for the mounting operation of the sensor 30 can be shortened.

<< 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.

  Moreover, in said embodiment, although the sensor 30 which detects the deformation amount of the annular part of the sensor main body 32 which is the load detection part 37 with a distortion sensor and measures a load was mentioned as an example, it is limited to this. Instead, it may be a sensor including a magnet that is displaced in accordance with the deformation of the annular portion and a Hall element that faces the magnet. In such a configuration, when the annular portion 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 male screw portion 31a of the extending shaft portion 31 of the sensor 30 is protruded outward from the hole portion 21 formed in the side frame 2a, and the nut 39 is screwed into the male screw portion 31a. Thus, the sensor 30 is attached to the side frame 2a. However, when the sensor 30 is attached, a configuration in which the tip of the extending shaft portion 31 does not protrude outside the hole portion 21 may be used. With such a configuration, it is possible to suppress the extension shaft portion 31 from interfering with its peripheral members.

  In the above embodiment, the annular portion of the sensor main body 32 that is the load detection unit 37 is pressed against the sensor receiving brackets 65 and 66 via the sliding member 42. It may be configured to directly press. Further, another relay member in place of the sliding member 42 may be installed in the load transmission path from the side frame 2a to the sensor body 32.

  In the above-described embodiment, the sliding member 42 corresponds to a movable portion that moves in accordance with the deformation of the annular portion of the sensor body 32. However, the sensor receiving brackets 65 and 66 are pressed in direct contact with the annular portion. In the configuration, the sensor receiving brackets 65 and 66 themselves correspond 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 pipes,
5 erection pan, 6 S spring,
10 rail mechanism, 11 lower rail, 12 upper rail,
13 Support bracket, 14 Member frame,
17 Slide lever,
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 side adjacent part,
30 sensor, 31 extension shaft part, 31a male thread part, 31b adjacent part,
32 sensor body, 33 shaft body, 34 substrate unit,
35 Positioning part, 36 Housing shaft part, 36a Same diameter part, 36b Different diameter part,
37 Load detector, 37a Load receiving surface, 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,
44 washer,
60 bottom wall part, 61 standing wall part, 62 insertion hole, 63 annular part,
65, 66 sensor receiving bracket,
101 seat frame, 111 lower rail, 112 upper rail,
130 load measuring sensor, 131 shaft,
F seat frame, S seat unit, Z vehicle seat Vs cavity

Claims (11)

A load measuring sensor including a sensor main body that detects a load applied to the seat and an extending portion that extends from one end of the sensor main body, with the extending portion positioned on a side of the sensor main body, An attachment structure for fastening and attaching the extension portion to an attachment member provided on a sheet,
A load input unit that contacts the load measurement sensor and inputs the load to the load measurement sensor;
A sensor main body receiving portion against which the sensor main body is pressed when the load measuring sensor is moved by the load input from the load input portion,
The load measuring sensor includes a deforming portion in the sensor body that is deformed by pressing against the sensor body receiving portion when the load measuring sensor is moved by the load input from the load input portion. The magnitude of the load is measured by deformation of
The deforming portion is an annular portion that is distorted in a radial direction by pressing against the sensor body receiving portion,
The sensor body receiving portion has a sliding member that abuts on the outer periphery of the annular portion when the annular portion presses against the sensor body receiving portion, and that can slide on the outer peripheral surface of the annular portion. And
The sliding member is a cylindrical body into which the annular portion is fitted, and has flanges at both ends in the sliding direction of the sliding member, and the flange on one end side in the sliding direction. And the flange on the other end side is formed to be symmetrical,
An attachment structure for attaching a load measurement sensor, wherein the load input part and the sensor body receiving part are separated from each other when the load measurement sensor is attached to the attachment member. The load measuring sensor is rotated by the load input from the load input unit,
The deformation unit moves in a direction of pressing against the sensor body receiving part by the rotation of the load measuring sensor,
The load input part and the sensor main body receiving part are separated from each other in the extending direction of the extending part when the load measuring sensor is attached to the mounting member. Mounting structure for mounting the described load measuring sensor.   In a state where the load measuring sensor is attached to the attachment member, the load input portion is located on the opposite side of the sensor body as viewed from the sensor body receiving portion in the extending direction of the extension portion. A mounting structure for mounting the load measuring sensor according to claim 2. The seat has a side frame that is spaced apart in the width direction of the seat,
The sensor body receiving portion is disposed at a position aligned with the side frame in the extending direction of the extending portion, and has a standing wall portion in which an insertion hole into which the deforming portion is inserted is formed.
The mounting structure for mounting a load measuring sensor according to claim 2 or 3 , wherein a portion of the standing wall portion located below the insertion hole extends downward along the vertical direction. The mounting structure for attaching a load measuring sensor according to any one of claims 1 to 4 , wherein the sensor body receiving portion constitutes at least a part of a rail member on which the seat is placed. The sensor body receiving portion has a standing wall portion in which an insertion hole into which the deformable portion is inserted is formed,
The standing wall portion has an annular portion formed inside the insertion hole and projecting in the width direction of the seat, and the deformation when the load measuring sensor is moved by the load input from the load input portion. The mounting structure for attaching the load measuring sensor according to any one of claims 1 to 5 , wherein the portion presses against an inner peripheral surface of the insertion hole. The mounting structure for attaching a load measuring sensor according to claim 6 , wherein the annular portion protrudes toward the side where the load input portion is located in the width direction. The mounting structure for attaching a load measuring sensor according to claim 6 , wherein the annular portion protrudes toward a side opposite to a side where the load input portion is located in the width direction. Press against the inner peripheral surface of the insertion hole said annular portion when said load measuring sensor is moved by the load inputted from the front Symbol load input portion through the sliding member,
Among pre Kitsuba portion, one end side flange portion positioned on one end side of the sliding direction is adjacent to the tip portion outside than the tip portion of the annular portion in the width direction,
The mounting structure for attaching a load measuring sensor according to any one of claims 6 to 8 , wherein an outer edge of the tip end portion of the annular portion is located inside an outer edge of the one end side flange portion. Before Symbol sensor body includes an inner portion located inside the said annular portion in the radial direction,
The inner portion is adjacent to the inner large-diameter region, which is in contact with the annular portion when the annular portion is distorted inward in the radial direction, and the inner large-diameter region. An inner portion small diameter region having a smaller diameter than the region,
In a state where the load measuring sensor is attached to the attachment member, the inner portion large diameter region and at least a part of the inner portion small diameter region are disposed in the insertion hole. A mounting structure for mounting the load measuring sensor according to any one of claims 6 to 9 . The seat includes a side frame that is spaced apart in the width direction of the seat,
The mounting member, the mounting structure for mounting a load measuring sensor according to any one of claims 1 to 1 0, characterized in that said side frames.

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