JP2002087131A - Occupant weight detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an occupant weight detection device 1A capable of accurately detecting a weight of an occupant by enhancing a detection accuracy of a load detection sensor 3 by only acting a vertical load to the load detection sensor 3. SOLUTION: The occupant weight detection device is provided with a piston part 7 and a cylinder part 8 as a vertical movement guide means fixed between an underframe to which a seat is mounted and fixed and a seat rail 5 and only vertically guiding a movement between the underframe 4 and the seat rail 5. This vertical movement guide means catches a load in a forward/ rearward and right/left directions even if the load in the forward/rearward and right/left directions is applied between the underframe 4 and the seal rail 5. The guide means only vertically guides a movement between a seat body part and a seat fixing part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant weight detection device, and more particularly to an occupant weight detection device suitable for being applied to a seat body of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a device for protecting an occupant such as an airbag or a seatbelt of a vehicle, the deployment pressure of the airbag, the timing, and the pretension of the seatbelt are adjusted in accordance with the occupant's weight, and each occupant is provided with a device. There is a trend to provide optimal protection performance. The configuration of the occupant weight detecting device for detecting the weight of the occupant is described in Japanese Patent Application Laid-Open No. H11-1153. The occupant weight detection device disclosed in this publication detects a weight of an occupant by disposing a load detection sensor between both a seat body on which the occupant sits and a seat fixing portion where the seat body is installed. It is possible.

[0003]

However, for example, in a seat body of an automobile, the seat weight in the vertical direction is
In addition to the weight of the occupant, the vehicle receives loads in the front-rear direction due to acceleration and deceleration of the vehicle, and loads in a combined direction including the front-rear and left-right directions due to turning.
This applies a bending and torsion load to the load detection sensor disposed between the seat body and the seat fixing portion where the seat body is installed, in addition to the vertical load. In a load detection sensor that accurately detects the weight of an occupant by detecting the load in the vertical direction, the bending and torsion loads act on the load detection sensor to change the sensor output, and as a result, the detection accuracy Is a problem.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to improve the detection accuracy of a load detection sensor by applying only a vertical load to a load detection sensor and to accurately detect the weight of an occupant. It is to provide a detection device.

[0005]

In order to solve the above-mentioned problems, according to the occupant weight detecting apparatus of the present invention, the seat body is fixed between the seat fixing portion and the seat body. The vertical movement guide means that guides the movement between the sheet fixing portion and the seat fixing portion only in the vertical direction, so that even if a load in the front and rear and left and right directions acts between the seat fixing portion and the seat body, these front and rear left and right directions Load can be received. The vertical movement guide means guides the movement between the seat body and the seat fixing portion only in the vertical direction.

[0006] Thus, only the vertical load acts on the load detecting means fixed between both the seat fixing portion and the seat main body, and the detection accuracy of the load detecting sensor can be improved, and the load detecting sensor can accurately detect the load. An occupant weight detection device capable of detecting the weight of an occupant can be provided.

According to the occupant weight detection device of the second aspect of the present invention, the occupant is fixed between the seat fixing portion and the seat main portion, and guides the movement between the seat main portion and the seat fixing portion only in the vertical direction. Since the vertical movement guide means is provided, even if a load in the front-rear and left-right directions acts between the seat fixing portion and the seat body, the load in the front-rear and left-right directions can be received. However, when an excessive load is applied to the vertical movement guide means, it is difficult to completely receive the load in the front-rear, left-right direction.

Therefore, when the load detecting means having a contact support portion at one end is disposed between both the seat fixing portion and the seat body portion, one end is contact-supported by the contact support portion and the other end is fixed. I did it. Then, even if the load in the front-rear, left-right direction tries to act on the load detecting means, the contact support portion provided at one end of the load detecting means shifts the contacting portion, and the load in the front-rear, left-right direction acts on the load detecting means. To prevent

Thus, only the vertical load acts on the load detecting means fixed between the seat fixing portion and the seat body, and the detection accuracy of the load detecting sensor can be improved. An occupant weight detection device capable of detecting the weight of an occupant can be provided.

According to the occupant weight detecting device of the present invention, the vertical movement guide means is constituted by the piston portion and the cylinder portion which are slidably fitted in the axial direction, so that the load in the front-rear and left-right directions is provided. And guide the movement between the seat body and the seat fixing portion only in the vertical direction. The above-described operation can be obtained, and an occupant weight detection device having a simple configuration including the piston portion and the cylinder portion can be provided.

According to the occupant weight detecting device of the present invention, the guide rail portion in which the pin portion is slidably mounted in the elongated hole portion receives the load in the front-rear and left-right directions, and also receives the seat body and the seat. The movement between the fixed parts is guided only in the vertical direction. In addition, the above-described operation can be obtained, and an occupant weight detection device having a simple configuration using a guide rail having a pin and an elongated hole can be provided.

According to the occupant weight detecting apparatus according to the fifth aspect of the present invention, the parallel link mechanism is fixed between the seat fixing portion and the seat main portion and moves between the seat main portion and the seat fixing portion substantially in parallel. Since the sheet main body and the sheet fixing portion are moved substantially in parallel between the sheet main body and the sheet fixing portion, the sheet main body and the sheet fixing portion are guided vertically.

When the load detecting means having a contact support portion at one end is provided between both the seat fixing portion and the seat body portion, one end is contact-supported by the contact support portion and the other end is fixed. I made it.

[0014] Even if a load in the front-rear and left-right directions is about to act on the parallel link mechanism and the load detecting means having the above-described configuration, the contact support provided at one end of the load detecting means shifts the contacting part. This prevents loads in the front-rear and left-right directions from acting on the load detecting means.

As a result, only the vertical load acts on the load detecting means fixed between the seat fixing portion and the seat body, and the detection accuracy of the load detecting sensor can be improved. An occupant weight detection device capable of detecting the weight of an occupant can be provided.

According to the occupant weight detecting device of the present invention, when a plurality of load detecting means are arranged in a substantially lattice shape, the load detecting means is located on a substantially lattice side of adjacent grid points. The load detecting means is disposed at lattice points where the relations do not adjoin each other, and a spacer portion is provided at a position adjacent to the load detecting means so as to be displaced by the same load as the load detecting means.

Thus, the position and orientation between the seat body and the seat fixing portion are stabilized by obtaining the load detection means and the support points of the spacers, and the load in the vertical direction due to the stable position and orientation even with a small load detection means. And the detection accuracy of the load detection sensor can be improved,
An occupant weight detection device capable of accurately detecting the weight of an occupant can be provided.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of an occupant weight detection device according to the present invention will be described in detail with reference to the drawings. The occupant weight detection device described below relates to an occupant weight detection device that accurately detects the weight of an occupant sitting on a seat. In particular, the occupant weight detection device illustrated in FIG. Show. FIG. 1 is an overall configuration diagram showing an occupant weight detection device according to a first embodiment of the present invention.

The occupant weight detecting device 1A includes a seat body on which the occupant sits, a seat fixing portion for installing the seat body,
And a vertical movement guide means and a load detection means provided between the seat body and the seat fixing part.

The seat body comprises a seat 2 and an underframe 4 to which the seat 2 is attached and fixed. Also,
The seat fixing portion is constituted by a seat rail 5 attached and fixed to a floor 6 of the vehicle. The underframe 4 and the seat rails 5 are arranged below the seat 2 in two pairs in parallel.

Between the under frame 4 on the seat body side and the seat rail 5 on the seat fixing section, a piston section 7 and a cylinder section 8 as vertical movement guide means are provided one at each of four corner positions of the seat 2. A total of four pistons are provided, and the piston 7 is fixed to the underframe 4 and the cylinder 8 is fixed to the seat rail 5. The vertical movement guide means in which the axial direction of the piston portion 7 and the cylinder portion 8 is fixed in the vertical direction guides the movement between the underframe 4 and the seat rail 5 only in the vertical direction.

The above-mentioned piston portion 7 and cylinder portion 8 are slidably fitted in the axial direction with each other, and have only a slidable gap in a direction perpendicular to the axial direction. Are fitted. The arrangement order of the piston part 7 and the cylinder part 8 may be reversed, and the piston part 7 may be fixed to the seat rail 5 and the cylinder part 8 may be fixed to the under frame 4.

The load detecting means comprises a load detecting sensor 3, and is disposed between the underframe 4 and the seat rail 5 at a position where the vertical movement guiding means is vacant. In the present embodiment, one load detecting means is disposed at the center. An example is shown. When a load is applied in the up-down direction, the load detection sensor 3 can accurately detect the applied load, and both ends of the load detection sensor 3 in the up-down direction are connected to the underframe 4 and the seat rail 5, respectively. Mount and fix between. In addition, the arrangement of the load detection sensors 3 and the number of arrangements are not limited to the above-described example, and may be variously selected depending on the sheet shape, the use environment of the sheet, and the like.

Next, the operation of the first embodiment will be described. An occupant sits on a seat 2 of a vehicle (not shown), and the vehicle accelerates and decelerates, so that the load in the front-rear direction and the front-rear and left-right directions by turning are adjusted between the seat body and the seat fixing portion. Assume a state in which a load from a combined direction is received.

In this state, in the direction perpendicular to the axial direction in which the piston 7 and the cylinder 8 are fitted as the vertical movement guide means, the load in the front-rear, left-right direction is applied to the portion where they are fitted. Take it. Then, the movement of the underframe 4 and the seat rail 5 is guided only in the vertical direction.

As a result, only the vertical load acts on the load detection sensor 3 fixed between the underframe 4 and the seat rail 5, and the detection accuracy of the load detection sensor 3 can be improved. An occupant weight detection device 1A capable of accurately detecting the weight of an occupant can be provided.

(Second Embodiment) FIG. 2 shows an occupant weight detection device according to a second embodiment of the present invention. FIG. 2 is an overall configuration diagram showing an occupant weight detection device according to a second embodiment of the present invention. Components that are substantially the same as those in the first embodiment of FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

The seat body of the occupant weight detecting device 1B shown in FIG. 2 comprises a seat 2 and a guide rail 14 to which the seat 2 is attached and fixed. Further, the seat fixing portion is constituted by a seat rail 5 attached and fixed to a floor 6 of the vehicle.

A support rod portion 12 to which a cylindrical pin portion 11 is fixed is attached and fixed to the seat rail 5 on the seat fixing portion side. The guide rail section 14 on the side of the seat body is provided with a vertically long slot 13, and the pin section 11 is slidably mounted in the slot 13. Here, the pin portion 11 and the long hole portion 13 only have a slidable gap in a direction perpendicular to the vertical direction, and the two are fitted without rattling. The pin portion 11 and the long hole portion 13 described above.
Constitute vertical movement guide means, and guide the movement between the guide rail portion 14 and the seat rail 5 only in the vertical direction.

The guide rail portion 14 on the side of the seat body is provided with an elongated hole portion 15 which is long in the direction in which the sheet 2 slides (in the front-back direction). On the other hand, a load detection sensor 3 having a pin 16 on the upper side is provided, and the pin 16 is
5, one end of the load detection sensor 3 is in contact with and supported by the seat body. The other end of the load detection sensor 3 is fixed to the seat rail 5 and has a fixed vertical position for detecting the load of the load detection sensor 3. The pin portion 16 and the elongated hole portion 15 constitute a contact support portion, and FIG.
In the example, two contact support portions are arranged on one seat rail 5, that is, a total of four contact support portions.

The contact support portion composed of the pin portion 16 and the long hole portion 15 may be arranged in the reverse order, with the pin portion 16 being disposed on the guide rail portion 14 and the long hole portion 15 being disposed on the load detecting sensor 3. May be provided respectively. In addition, the number of the load detection sensors 3 is not limited to the example described above, and may be variously selected depending on the sheet shape, the use environment of the sheet, and the like.

Next, the operation of the second embodiment will be described.

The vertical movement guide means comprising the pin portion and the elongated hole portion 13 receives the load in the front-rear and left-right directions by fitting them together in the direction perpendicular to the vertical direction without rattling, and in the vertical direction. Only the guide rail portion 14 and the seat rail 5 are guided to move, but when an excessive load is applied to the vertical movement guide means, it is difficult to completely receive the load in the front, rear, left, and right directions.

In this case, the contact portion between the pin portion 16 and the elongated hole portion 15 is shifted to prevent the load sensor 3 from acting in the front-rear and left-right directions.

As a result, only the vertical load acts on the load detecting sensor 3 disposed between the guide rail portion 14 and the seat rail 5, and the detection accuracy of the load detecting sensor can be improved. Accordingly, it is possible to provide the occupant weight detection device 1B capable of accurately detecting the weight of the occupant.

Here, also in the load detecting sensor 3 shown in the first embodiment, a contact support portion is formed at one end similarly to the load detecting sensor 3 shown in the second embodiment, so that the load detecting sensor 3 The applied bending load can be reduced, and the detection accuracy of the load detection sensor can be further improved.

(Third Embodiment) FIG. 3 shows an occupant weight detecting apparatus according to a third embodiment of the present invention. FIG. 3 is an overall configuration diagram showing an occupant weight detection device 1C according to a third embodiment of the present invention. Components that are substantially the same as those in the first embodiment of FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

The seat body of the occupant weight detecting device 1C shown in FIG. 3 comprises a seat 2 and an under frame 24 to which the seat 2 is attached and fixed. Also, the seat fixing part
It comprises a seat rail 5 mounted and fixed to a floor 6 of the vehicle.

Fixed between the underframe 24 and the seat rail 5 by the fixing pins 22 and 23,
Two link rod portions 21 connecting the underframe 24 and the seat rail 5 are assembled substantially in parallel. The two link rod portions 21 are freely rotated about the fixing pins 22 and 23 as support shafts, thereby moving the under frame 24 and the seat rail 5 substantially in parallel, and guiding the two in the vertical direction. To form a parallel link mechanism.

In the under frame 24 on the seat body side, the direction in which the sheet 2 slides (the front-back direction).
And a long slot portion 25 is provided. On the other hand, the load detection sensor 3 having the pin portion 26 is provided on the upper side, and one end of the load detection sensor 3 is supported in contact with the seat body by mounting the pin portion 26 in the elongated hole 25. The other end of the load detection sensor 3 is fixed to the seat rail 5 and has a fixed vertical position for detecting the load of the load detection sensor 3. The pin portion 26 and the elongated hole portion 25 constitute a contact support portion. In the example of FIG. 3, two contact support portions are arranged on one seat rail 5, that is, a total of four contact support portions.

One of the load detection sensors 3 provided with two pin portions 26 disposed on one seat rail 5 is
The spacer portion 3a is configured to be displaced by the same load as the load detection sensor 3. FIG. 4 is an upper surface layout diagram showing the layout relationship of the load detection sensors when the occupant weight detection device of FIG. 3 is viewed from the upper surface of line AA. As described above, for example, when a plurality of load detection sensors 3 are arranged in a substantially lattice shape, the load detection sensors 3
The load detection sensor 3 is disposed at a lattice point where the two do not adjoin each other, and a spacer portion 3a configured to be displaced by the same load as the load detection sensor 3 is disposed at a position adjacent to the load detection sensor 3. I do.

As a result, the support points of the load detection sensor 3 and the spacer 3a are obtained, and the position and orientation between the seat body and the seat fixing portion are stabilized. The load in the direction can be detected, and the detection accuracy of the load detection sensor 3a can be improved.

Next, the operation of the third embodiment will be described.

The parallel link mechanism, which includes two link rods 21 on one side, receives the load in the front-rear and left-right directions, and guides the movement of the underframe 24 and the seat rail 5 only in the vertical direction. In the occupant weight detection device 1C having the parallel link mechanism, the load detection sensor 3 is displaced by shifting the contact portion between the pin portion 26 and the elongated hole portion 25.
It is indispensable to provide a contact support portion for preventing a load in the front-rear, left-right direction from acting on the contact support.

Although not shown, the above-mentioned contact support portion has a rolling contact structure, such as a bearing mechanism, instead of the pin portion 26 mounted on the elongated hole portion 25, so that the bending load applied to the load detection sensor 3 can be reduced. Further, the load can be reduced, and the detection accuracy of the load detection sensor can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an occupant weight detection device according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an occupant weight detection device according to a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing an occupant weight detection device according to a third embodiment of the present invention.

FIG. 4 is an upper surface layout diagram showing an arrangement relationship of the load detection sensors when the occupant weight detection device of FIG. 3 is viewed from the upper surface of the line AA.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B, 1C Occupant weight detection device 2 Seat 3 Load detection sensor (load detection means) 3a Spacer part 4 Underframe 5 Seat rail (seat fixing part) 7 Piston part 8 Cylinder part 11 Pin part 13 Slot hole 14 Guide rail Part 21 Parallel link part 22, 23 Link fixing pin 24 Underframe 25 Slot 26 Pin part

Claims (6)

[Claims] 1. An occupant weight detection device for detecting a weight of an occupant by arranging load detection means between both a seat body on which an occupant sits and a seat fixing portion on which the seat body is installed. Up and down movement guide means fixed between a seat fixing portion and the seat body portion to guide movement between the sheet body portion and the sheet fixing portion only in the vertical direction, An occupant weight detection device fixed between both a fixing portion and the seat body. 2. An occupant weight detection device for detecting a weight of an occupant by arranging load detection means between both a seat body on which an occupant sits and a seat fixing portion on which the seat body is installed. Vertical movement guide means fixed between a sheet fixing portion and the sheet main body portion to guide movement between the sheet main body portion and the sheet fixing portion only in the vertical direction; and contact support at one end of the load detection means Wherein the load detecting means is provided between the sheet fixing portion and the seat body, and one end thereof is supported by the contact supporting portion and the other end is fixed. An occupant weight detection device, characterized in that: 3. The occupant weight detection according to claim 1, wherein said vertical movement guide means comprises a piston portion and a cylinder portion which are slidably fitted in an axial direction. apparatus. 4. The vertical movement guide means has a pin fixed to one of the sheet fixing portion and the sheet main body, and an elongated hole, and the pin slides on the elongated hole. 3. The occupant weight detection device according to claim 1, wherein the occupant weight detection device comprises a guide rail portion that is freely mounted. 5. An occupant weight detecting device for detecting a weight of an occupant by arranging a load detecting means between a seat body on which an occupant sits and a seat fixing portion on which the seat body is installed, A parallel link mechanism fixed between the seat fixing portion and the seat body and moving the sheet body and the sheet fixing portion substantially in parallel, a contact support portion at one end of the load detecting means, Wherein the load detecting means has one end contact-supported by the contact support portion and the other end fixed between the seat fixing portion and the seat body portion. apparatus. 6. A plurality of said load detecting means being arranged in a substantially lattice-like manner, wherein, among adjacent lattice points, lattice points which are not adjacent to each other on said substantially lattice-like side. Wherein the load detecting means is disposed at a position adjacent to the load detecting means, and a spacer portion having the same displacement as the load detecting means for the same load is disposed at a position adjacent to the load detecting means. Item 1 of item 5
The occupant weight detection device according to the paragraph.