JP2005075054A - Load detection seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of performing a load detection more easily than that of the prior art load detection seat without increasing its cost and further capable of facilitating a fixing of the load sensor. <P>SOLUTION: This is a load detection seat in which load sensors 8, 9 for use in detecting a load acted on a sitting surface SS of a seat 1 are arranged between each of a pair of rail members 3, 4 arranged at the right side and left side of the sitting surface SS to support a seat 1 on a floor surface and a seat frame SC acting as a seat framework. There are provided rods 21, 22 cooperatively connecting the right and left upper brackets 4, 7 having one end of each of the rods immovably fixed to the upper brackets 4, 7. There are provided links 8, 9. One end of each of the links is fixed on the rods 21, 22. The other end of each of the links is rotatably pivoted on a seat cushion frame 11 (the seat frame SC) so as to accept a load acting on the seat cushion frame 11 and apply a twisting force on the rods 21, 22. Load sensors 8, 9 are arranged at a part of each of the rods 21, 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a load detection sheet that detects a load acting on a sheet by a load sensor using a strain gauge or the like, and particularly relates to a mounting structure of a load sensor on the sheet.

Conventionally, in this type of apparatus, rail members (for example, a lower rail and an upper rail) are provided on the left and right with respect to the seating surface of the seat, and the seat body is supported by the rail member. In this case, the upper rail that is movable along the lower rail has a structure that supports the seat pan via the seat cushion bracket. In this structure, the seat cushion bracket and the upper rail are fixed by bolts subjected to special processing. In this case, the bolt is provided with a through-hole through which the center passes, and a load sensor (for example, a strain sensor) for detecting a load is disposed in the through-hole (for example, Patent Document 1). A bolt having such a load sensor inside is provided on each of the front and rear sides of the seating surface, and the load acting on the seating surface can be detected by four load sensors.
JP 2002-172962 A (pages 4 and 5)

  However, in the structure shown in the above publication, a specially processed bolt (bolt having a load sensor inside) is required at the portion where the seat bracket and the upper rail are joined, and the front and rear of the seating surface. In order to detect left and right, left and right, four sensors are required. Thus, as the number of load sensors increases, the cost increases accordingly. Further, as described above, it is difficult to form a through hole in the center of the bolt and attach the load sensor to the through hole with high accuracy because it is a highly precise and detailed work. Therefore, this point also increases the cost.

  Therefore, the present invention has been made in view of the above-described problems, and it is an object to provide a structure capable of detecting a load without increasing the cost as compared with the prior art, and a structure capable of easily attaching a load sensor. To do.

  The first means taken in order to solve the above-described problem is provided between a pair of support members provided on the left and right sides of the seating surface and supporting the seat with respect to the floor surface, and a seat frame serving as a skeleton of the seat. A load detection seat provided with a load detection means for detecting a load acting on the seating surface of the seat, and a rod that is linked to the left and right support members and has a fixed portion fixed to the support member and cannot rotate. And a connecting member that is fixed to the rod and pivotally supported with respect to the seat frame, receives a load acting on the seat frame, and applies a torsional force to the rod. And the load detecting means is provided on a part of the rod.

  In this case, more preferably, the load detecting means may be provided between the fixed portion and the connecting member.

  Further, a pair of rods provided with load detecting means may be provided on either the left or right side in the front-rear direction with respect to the seating surface.

  Furthermore, the load detection means may be provided in a state inclined with respect to the circumferential direction of the rod.

  The second means taken in order to solve the above-described problems is provided between a pair of support members provided on the left and right sides of the seating surface and supporting the seat with respect to the floor surface, and a seat frame serving as a skeleton of the seat. In the load detection seat provided with load detection means for detecting the load acting on the seating surface of the seat, the load detection seat is connected to the left and right support members, and the fixing portion is fixed to the support member so that the rotation cannot be performed. A connecting member which is pivotally supported with respect to the seat frame and generates a torsional force upon receiving a load acting on the seat frame, and the load detecting means is a part of the connecting member. The gist of this is

  According to the first aspect of the present invention, the fixed portion is fixed to the support member in a state where the rod is connected to the left and right support members, and cannot be rotated by fixing the fixed portion to the support member. On the other hand, since the connection member is fixed to the rod and pivotally supported with respect to the seat frame, when a seated person sits on the seating surface of the seat, the load becomes the seat frame. (For example, it acts on a seat cushion frame). When the seat frame is seated by the seated person, the load received by the seat frame is then transmitted from the seat frame to the support member below the seat via the connecting member. At this time, depending on the magnitude of the load received by the seat frame, a force (external force due to seating or the like) that causes the connecting member to rotate about the fulcrum of the linked rod is twisted into the non-rotatable rod. Acts as a drag force. The torsional force acting on the rod can be detected by load detecting means provided on the rod. This is because the torsional force acting on the rod increases in proportion to the magnitude of the load acting on the seat, so the load acting on the seat can be detected by detecting the torsional force by the load detection means. Is determined by a determination device (signal processing device) for determining an output signal from the load detection means. In the above-described configuration, it is only necessary to provide a load detection means on the rod in a configuration in which a part of the rod linking the left and right is fixed and a torsional force is applied to the rod via the connecting member. Load detection of the load acting on the seat can be performed with a simple configuration. This is because when the center of a bolt is machined as in the past and a load sensor is provided therein, the load sensor is inserted into a high-accuracy bolt with high accuracy and no detailed work is required. I can suppress up.

  According to the second aspect of the present invention, when the load detecting means is provided between the fixed portion and the connecting member, the load is detected at a portion where the torsional force acts between the fixed portion and the connecting portion on the rod. Since the means is provided, the load detection accuracy by the load detection means is improved, and the reliability of load detection is improved.

  According to the third aspect of the present invention, when a pair of rods provided with load detection means are provided on either the left or right side in the front-rear direction with respect to the seating surface, the load is detected on either the left or right side. The cost is not increased as compared with the case where two load detecting means are provided on each of the left and right sides.

  According to the fourth aspect of the present invention, the fixing member is fixed to the supporting member in a state where the connecting member is connected to the left and right supporting members, and the connecting member cannot be rotated by fixing the fixing portion to the supporting member. Since the connecting member is pivotally supported with respect to the seat frame, when a seated person sits on the seating surface of the seat, the load is a seat frame ( For example, it acts on a seat cushion frame. The load received by the seat frame is then transmitted from the seat frame to the support member below the seat via the connecting member, and is a force (by seating or the like) that causes the connecting member to rotate about the fixing portion of the connecting member with the support member. External force) acts as a torsional force on the non-rotatable connecting member. The torsional force acting on the connecting member can be detected by load detecting means provided on the connecting member. This can detect the load acting on the seat with a simple configuration. This can reduce the number of parts in the seat configuration by integrating the rod and the connecting member in the invention described in claim 1 and combining the functions of both. Also in this configuration, when the center of the bolt is machined as before and a load sensor is provided in the center, it is necessary to insert the load sensor into a high-accuracy bolt with high accuracy and install it. Since it disappears, the cost increase can be suppressed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration when the load detection seat 1 is applied as a vehicle seat (simply referred to as a seat) in a vehicle. In the following description, the upper part from the upper rail 3 will be described as a seat body.

  As shown in FIG. 2, the seat 1 includes a support mechanism 10 provided at a lower portion of the seat and fixed to the floor, a seat cushion SC disposed on the support mechanism 10 and having a seating surface SS, and a seat cushion SC. A seat back SB that can be tilted by a predetermined angle in the front-rear direction with respect to the seating surface SS around the rod 23 as a rotation center, and a headrest that can be adjusted in height to protect the seated person's head above the seat back SB SH. In the seat 1 shown in FIG. 1, a mechanism (sliding mechanism) that holds the seat position at a predetermined position while the seat body is slid in the front-rear direction and a mechanism (reclining mechanism) that holds the reclining angle of the seat back SB at a predetermined angle. However, since these mechanisms are known, the description thereof is omitted here.

  The seat support mechanism 10 supports the seat body with respect to the floor surface, and includes support members (a rail member, the lower rail 2 and the upper rail 3, and the upper brackets 4 and 7), the rods 21 and 22, and the link 5. , 6.

  As shown in FIGS. 2 and 3, the lower rail 2 is formed by pressing a metal plate and has a linear shape. The lower rail 2 has an end in the width direction bent inward and opened upward, and has a substantially U-shaped cross section in the axial direction. In addition, the lower rail 2 is made of the same material and has the same shape and is fixed to the floor surface using a fixing member such as a bolt (not shown) in a state of being parallel to the floor surface in a pair of left and right with respect to the seating surface SS.

  The upper rail 3 is formed by pressing the same metal plate as the lower rail, and the center protrudes upward as shown in FIG. An end of the upper rail 3 is bent upward so as to be guided by an upper concave portion bent toward the inside of the lower rail 2, and the upper rail 3 is guided by the lower rail 2, and is moved in the front-rear direction with respect to the lower rail 2. It can move freely. In this case, a roller 17 is disposed below the upper rail 3, and the upper rail 3 is configured to be able to slide smoothly in the front-rear direction with respect to the lower rail 2 fixed to the floor surface.

  As shown in FIG. 3, the upper bracket 4 has a U-shaped cross section that opens upward, and is fixed by welding at several locations above the upper rail 3. The upper bracket 4 has a through hole 4a through which the rod 21 is inserted forward and backward with respect to the seating surface SS, and is formed in an arc-shaped bearing portion on both side surfaces facing each other. A through hole 4b through which a rod 22 similar to the rod 21 is inserted is formed in a bearing portion having an arc shape on both opposing side surfaces.

  On the other hand, above the lower rail (right side) opposite to the lower rail 2 on which the upper bracket 4 is provided (on the left side with respect to the seating surface SS), there is an L-shaped cross section having the same shape as the upper bracket 4 in side view. The upper bracket 7 is fixed at several locations above the upper rail on that side by welding. The upper bracket 7 has a through hole 7a having the same diameter as the through hole 4a at a position facing the through hole 4a in front of the seating surface SS in a side view. At the same time, a through hole 7b having the same diameter as the through hole 4b is formed at a position facing the through hole 4b behind the seating surface SS.

  A hollow rod 21 is inserted into the pair of through holes 4a and 7a located on both sides of the seating surface SS from the left and right direction (width direction) of the seat 1, and a part of the rod 21 (for example, , An end portion or a position in the vicinity of the end portion) is fixed to one side wall of the bearing portion of the upper bracket 4 facing each other by welding or the like from the inside or the outside. As a result, the rod 21 is supported at three points with respect to the upper bracket 4 in a state in which the through hole 4a is a fixed portion and cannot rotate. Further, in the vicinity of the through holes 4a and 7a of the rod 21, one end of the link 5 is fixed by welding or the like so as to be at the same angle with respect to the rod 21, and cannot be rotated. Further, the other end of the link 5 is pivotally supported by a caulking pin 11a in front of the seat cushion bracket 11 on the left side of the seating surface SS, and is attached rotatably.

  Similarly, a hollow rod 22 is inserted from the left and right direction (width direction) of the seat 1 into the through hole 4b and the through hole 7b behind the seating surface SS, and a part of the rod 22 (for example, an end) Or a position near the end) is fixed to one side wall of the opposed upper bracket 4 by welding or the like from the inside or the outside. As a result, the rod 22 is supported at three points in a state in which the rod 22 cannot rotate with respect to the upper bracket 4. Further, in the vicinity of the through holes 4b and 7b formed in the bearing portion through which the rod 22 passes, one end of the link 6 is fixed by welding or the like so that the one end of the link 6 has the same angle with respect to the rod 22, and the through hole 4b. Becomes a fixed part and cannot rotate. The other end of the link 6 is pivotally supported by a caulking pin 11b behind the seat cushion bracket 11 on the right side of the seating surface, and is attached rotatably.

  The load sensor 8 has a strain gauge (for example, the strain gauge is formed in a bridge shape) inside, and detects a resistance change proportional to the load acting on the seating surface SS by deformation of the strain gauge. Is. This load sensor 8 is attached on the outer peripheral surface of the rod 21 by fixing means such as adhesion between an outer side and an inner side through hole 4a provided on the side wall of one upper bracket 4. The load sensor 8 is attached in a state of being inclined with respect to the circumferential direction of the rod 21 (preferably, in a state of being inclined 45 degrees), and a load acting on the seating surface SS is applied to two-way component forces (with respect to the seating surface SS). Thus, detection is possible in the front-rear direction and the left-right direction. Similarly, the rear load sensor 9 has a strain gauge inside, and detects a resistance change in proportion to the load acting on the seating surface SS by the strain gauge. It is attached on the outer peripheral surface of the rod 22 between the outer and inner through-holes 4b provided on the side wall by fixing means such as adhesion. The load sensor 9 is attached in a state of being inclined with respect to the circumferential direction of the rod 22, and the load acting on the seating surface SS can be detected by component forces in two directions (front and rear direction and left and right direction with respect to the seating surface SS). It becomes possible. That is, the two load sensors 8 and 9 are arranged at arbitrary predetermined positions between the portions (here, the through holes 4a and 4b) and the links 5 and 6 where the rods 21 and 22 are fixed so as not to rotate. It is preferable to be provided at a site where distortion is likely to occur due to the load acting on the rods 21 and 22.

  Next, load detection when a seated person sits on the seating surface SS on the seat and a load acts on the seating surface SS will be described.

  When a seated person sits on the seating surface SS on the seat and a load acts on the seat cushion SC and the seat back frame SB, the load caused by the seating of the seated person first supports the seat itself against the floor surface 20. It is input to the sheet support mechanism 10. In this case, in the seat support mechanism 10, the load acting on the seat acts on the pair of left and right links 5 and 6 provided before and after the seating surface SS. The load acting on the front, rear, left and right links 5 and 6 generates a counterclockwise moment shown in FIG. In this case, the rods 21 and 22 to which the links 5 and 6 are fixed are fixed to the upper bracket 4 in a non-rotatable manner by fixing portions (through holes 4a and 4b) on one side. , 6 generates a torsional force (external force due to a seating load) proportional to the magnitude of the counterclockwise load. Since load sensors 8 and 9 are provided on the surfaces of the rods 21 and 22, Torsional force can be detected by the load sensors 8 and 9.

  In this case, it is sufficient to provide two load sensors 8 and 9 in the front-rear direction of the upper rail bracket 4 which is a rail member on at least one side, so that four load sensors are provided on the seating surface SS as in the conventional case. Cost does not increase compared to the case of providing. Moreover, since the load sensors 8 and 9 should just be provided in the surface of the rods 21 and 22, attachment is possible easily.

  In this embodiment, the load sensors 8 and 9 are configured to apply a load acting on the seating surface SS to the rods 21 and 22 via the links 8 and 9 having one end fixed. By adopting such a configuration, the load signals from the load sensors 8 and 9 are detected only from one side of the rail member to a discriminating device (signal processing device) (not shown) that discriminates the type of seated person based on the load signal. Since electrical wiring can be performed, the wiring can be easily routed.

  Further, in the present embodiment, the pair of links 5 provided on the left and right of the seating surface SS with respect to the front rod 21 are described as separate bodies, and the pair of links 6 on the left and right with respect to the rear rod 22 are described as separate bodies. However, the present invention is not limited to this. For example, as a modification thereof, by integrating the rod 21 and the link 5 and integrating the rod 22 and the link 6, the same effects as when they are configured separately can be achieved. Thus, if the left and right links 5 and 6 are respectively integrated with the rods 21 and 22 in the front-rear direction of the seating surface SS, the number of components of the components of the load detection sheet 1 can be reduced. Is clear.

  In the present embodiment, the pair of through holes 4a opposed to each other in a side view is formed in front of the side wall of the upper bracket 4, and the pair of through holes 4b are formed in the rear. However, the present invention is not limited to this. The pair of through holes 4a and 4b are formed only on the inner side, and a rod for connecting the left and right sides of the seating surface SS is inserted therethrough, and one end of the rods 21 and 22 is inserted from the inner side of the outer side wall of the upper bracket 4. You may fix so that rotation is impossible.

It is the perspective view which showed the structure of the frame | skeleton of the load detection sheet | seat in one Embodiment of this invention. It is sectional drawing in the position in which the rod in FIG. 1 is provided. It is a side view of a sheet | seat when a skin is attached with respect to the sheet | seat frame | skeleton in FIG.

Explanation of symbols

1 Load detection sheet (sheet)
2 Lower rail (rail member)
3 Upper rail (rail member)
4a, 4b Through hole (fixed part)
4,7 Upper bracket 5,6 Link (connecting member)
8,9 Load sensor (load detection means)
11 Seat cushion frame (seat frame)
12 Seat back frame (seat frame)
21 and 22 rods (connection members in the second embodiment)
SC Seat cushion SS Seating surface

Claims (4)

Load detecting means for detecting a load acting on the seating surface of the seat between a pair of support members provided on the left and right of the seating surface and supporting the seat with respect to the floor surface and a seat frame serving as a skeleton of the seat In the load detection sheet provided with
A rod that is linked to the left and right support members, and a fixed portion is fixed to the support member and cannot be rotated;
A connecting member that is fixed to the rod and pivotally supported with respect to the seat frame, and receives a load acting on the seat frame and applies a torsional force to the rod. ,
A load detection sheet, wherein the load detection means is provided on a part of the rod. The load detection sheet according to claim 1, wherein the load detection unit is provided between the fixed portion and the connecting member. 3. The load detection sheet according to claim 1, wherein a pair of the rods provided with the load detection means is provided on either the left or right side in the front-rear direction with respect to the seating surface. Load detecting means for detecting a load acting on the seating surface of the seat between a pair of support members provided on the left and right of the seating surface and supporting the seat with respect to the floor surface and a seat frame serving as a skeleton of the seat In the load detection sheet provided with
A load that is connected to the left and right support members, is fixed to the support member and cannot rotate, and is pivotally supported to the seat frame so as to act on the seat frame. Receiving a connecting member that generates a twisting force,
A load detection sheet, wherein the load detection means is provided in a part of the connecting member.

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