JP4187570B2 - Vehicle seat occupant weight measurement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat occupant weight measuring device that measures the weight of a seated person of a vehicle seat.
[0002]
[Prior art]
In recent years, in order to improve the performance of various safety devices such as seat belts and airbags, these safety devices are matched to the weight (body weight) of a passenger seated on a vehicle seat (hereinafter also simply referred to as “seat”). May control the behavior of
[0003]
As an occupant weight measuring device for a vehicle seat for measuring the weight of a seated person, devices as shown in FIGS. 5 and 6 are known (see Patent Document 1).
The apparatus 100 includes a front load sensor 200 that detects a load F1 applied to the front portion of the seat between the front end portion of the seat cushion frame 101 and the floor 102, and the rear end portion of the seat cushion frame 101 and the floor. A rear-side load sensor 201 that detects a load F2 applied to the rear portion of the seat is disposed between the acceleration sensor 202 and an acceleration sensor 202 that detects acceleration acting in the front-rear direction of the vehicle.
[0004]
The load sensors 200 and 201 and the acceleration sensor 202 are connected to a load estimation circuit 203. The load estimation circuit 203 calculates the load center of gravity of the seat based on the loads F1 and F2 detected by the load sensors 200 and 201. While calculating and correcting the seat load, the seat load is corrected based on the acceleration detected by the acceleration sensor 202, and the occupant weight is estimated based on the corrected load.
According to such an apparatus 100, it is possible to take into account the so-called escape load transmitted from the occupant's feet to the floor, which occurs when the occupant is seated or when the vehicle is accelerated or decelerated, and the measurement accuracy of the occupant weight is improved. Can do.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-297334 (FIGS. 1 and 2)
[0006]
[Problems to be solved by the invention]
Generally, in a vehicle seat, a slide rail is disposed between a seat frame and a floor, and the seat is often moved in the front-rear direction by the slide rail.
Therefore, the load transmitted to the front and rear load sensors varies depending on the position of the seat body moving back and forth on the seat rail. Variations need to be taken into account.
[0007]
However, in the case of the configuration (first embodiment) of Patent Document 1 shown in FIGS. 5 and 6, it is described that the load sensors 200 and 201 are arranged between the seat cushion frame 101 and the floor 102. Therefore, when the configuration is such that the seat is slid in the front-rear direction using the slide rail, each load sensor 200, 201 is specifically described with respect to the slide rail, the seat cushion frame 101, and the floor 102. There is a problem that it has not been clarified whether to install it on.
[0008]
An object of the present invention is to provide an occupant weight measuring device for a vehicle seat that can improve the accuracy of the weight measurement of a seated person in consideration of the above-described problems.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is an occupant weight measuring device for a vehicle seat that is attached to a vehicle seat and measures the weight of a seated person, and moves forward and backward on a lower rail fixed to the vehicle side. A load detecting means that is disposed between the upper rail and the cushion frame that is disposed above the upper rail and forms a part of the seat surface, and detects each load applied to the front and rear of the vehicle seat, The load detecting means includes a projecting portion fixed to the cushion frame side, and a support portion fixed to the upper rail side and supporting the projecting portion so as to be relatively movable up and down.
[0010]
According to the present invention , since the load detection means is arranged between the upper rail and the cushion frame, the load detection means can be moved in the front-rear direction integrally with the upper rail. Therefore, the load (occupant weight) transmitted to the load detection means can always be kept constant regardless of the position of the vehicle seat in the front-rear direction, and the measurement accuracy can be improved.
[0011]
The present invention relates to a passenger weighing apparatus of the car dual sheet, interposed between the sensor body the support portion and the projecting portion of the load sensing means, said load from the cushion frame, the protruding portion Via the sensor body.
[0012]
According to the present invention, collision detection section, the support section, by disposing the sensor body substantially collinear in the vertical direction, for example, swingably supported in the vertical direction in the vertical plane by an arm-like member Compared with the configuration in which the load from the cushion frame transmitted to one end of the arm is transmitted from the other end of the arm-shaped member to the sensor body, it is possible to reduce the load loss. Accuracy can be improved.
[0013]
The present invention relates to a passenger weighing apparatus of the car dual seat bracket between the cushion frame and the protruding portion, characterized in that the interposed.
[0014]
According to the present invention, by interposing the bracket, improves mounting rigidity of the cushion frame and the protrusion, the loss of load (loss) is not less, it is possible to improve the measurement accuracy.
[0015]
The present invention relates to a passenger weighing apparatus of the car dual sheet, said protrusion includes an opening penetrating in the vertical direction, the connector for the power supply to the sensor body, is disposed above the opening And is connected to the sensor body inside the opening.
[0016]
According to the present invention, since the connection with the sensor body in the inside of the opening as well as arranging the connector at the top of the opening of the protrusion, it is assumed that the wiring process is simplified, effective space of the seat lower vehicle Available.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
[First embodiment]
Embodiments of a vehicle seat occupant weight measuring device (hereinafter also simply referred to as “measuring device”) according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 3, a measuring device 10 is arranged on the upper part of a pair of left and right lower rails 1 and upper rails 2 arranged along the front-rear direction of the vehicle. A cushion frame 3 constituting a part of the seating surface is disposed. Note that the illustration of the seat back is omitted.
[0018]
The lower rail 1 is a member having a substantially U-shaped cross section along the left-right direction and having an opening 1 a on the upper surface, and is fixed to the floor surface via a rail bracket 4. And it fits in the lower part of the upper rail 2 inside the opening 1a, and supports the upper rail 2 so that sliding is possible in the front-back direction.
In addition, since the structure and operation | movement of the lower rail 1 and the upper rail 2 are known, detailed description is abbreviate | omitted.
[0019]
The measuring device 10 is a device for measuring the weight of a seated person of a vehicle seat, and is joined to the cushion frame 3 via a bracket 20 and is roughly constituted by a load detection means 30, a connector 40, and the like.
[0020]
The load detection means 30 are attached at two locations on the upper and lower surfaces of the upper rail 2. The load detection means 30 may be attached to only one of the left and right upper rails 2, or may be attached to both the left and right. In the present embodiment, it is assumed that the load detection means 30 is arranged one by one on the left and right upper rails 2 respectively, and the load detection means 30 attached to the front side of the left upper rail 2 is mainly described. .
[0021]
The bracket 20 is a substantially L-shaped member when viewed from the front, and has an opening (an upper opening 21 and a lower opening 22) penetrating left and right in the upper and lower portions.
Then, the upper opening 21 and the opening 3a formed on the side surface of the cushion frame 3 are overlapped, the bolts 23 are inserted into the openings 21 and 3a, and a nut (not shown) is used. It is fixed to the cushion frame 3.
[0022]
The lower opening 22 is fixed by welding in a state where the shaft 5 constituting a part of the seat surface is inserted, and the shaft 5 is supported by the left and right brackets 20.
Further, the bracket 20 is provided with an opening 24 (see FIG. 3) penetrating in the vertical direction. The bolt 24 and the projecting portion 31 of the load detecting means 30 to be described later are inserted into the opening 24. The bracket 20 and the protruding portion 31 are fixed by the nut 26. In addition, about the fixing method of the bracket 20 and the protrusion part 31, it is not limited to the volt | bolt 25 and the nut 26, For example, well-known fixing means, such as welding, can be used.
[0023]
As shown in FIGS. 2 and 3, the load detection means 30 is generally configured by a protruding portion 31, a support portion 32, and a sensor main body 33.
The protrusion 31 is a substantially cylindrical member having an opening 31a penetrating in the vertical direction. The front load detection means 30 includes one protrusion 31, and the rear load detection means 30 includes two protrusions 31.
The protruding portion 31 includes a first cylindrical portion 31b formed at the uppermost portion, a second cylindrical portion 31c formed below the first cylindrical portion 31b, and a lower side of the second cylindrical portion 31c. The formed third cylindrical portion 31d is integrally formed, and the outer diameters of the first cylindrical portion 31b, the second cylindrical portion 31c, and the third cylindrical portion 31d are r1, r2, and r3. In this case, the relationship r1 <r2 <r3 is established.
[0024]
Then, a ring-shaped step (hereinafter referred to as “first step 31e”) is formed at the joint portion between the first tubular portion 31b and the second tubular portion 31c and at the joint portion between the second tubular portion 31c and the third tubular portion 31d. And “second step 31 f”).
The inner diameter r4 of the first cylindrical portion 31b, the second cylindrical portion 31c, and the third cylindrical portion 31d is substantially constant.
[0025]
The outer diameter r1 of the first cylindrical portion 31b is smaller than the diameter r5 of the opening 24 of the bracket 20 described above, and the outer diameter r2 of the second cylindrical portion 31c is smaller than the diameter r5 of the opening of the bracket 20 described above. It is getting bigger. Therefore, as shown in FIG. 3, the lower surface of the bracket 20 and the first step 31e come into contact with each other by inserting the first cylindrical portion 31b into the opening 24 of the bracket 20.
Then, using the bolt 25 and the nut 26 as described above with the lower surface of the bracket 20 and the first step 31e in contact with each other, the bracket 20 and the protrusion 31 are fixed, and the protrusion 31 is the bracket. 20 is fixed to the cushion frame 3 side.
[0026]
In addition, a substantially circular gap 34 in plan view is formed in the lower portion of the third cylindrical portion 31d with a diameter r6, and a thin plate-like load transmission member 35 is fitted in this gap 34 portion. The load transmitting member 35 can move up and down integrally with the protruding portion 31. The operation of the load transmission member 35 will be described later.
[0027]
The support portion 32 is a member for supporting the protruding portion 31 so as to be movable up and down within a minute range.
The support portion 32 is formed with an opening 32a (inner diameter r7) that is substantially circular in plan view from the upper surface to the inside, and the lower portion of the protruding portion 31 is accommodated in the opening.
Specifically, a claw 32b that slightly protrudes toward the center is formed at the upper part of the opening 32a and in the entire peripheral area thereof. Therefore, the inner diameter of the opening is slightly reduced by the claw 32b, and the inner diameter r8 of the claw 32b is smaller than the inner diameter r7.
[0028]
The outer diameter r2 of the second cylindrical portion 31c is substantially equal to the inner diameter r8, and the outer diameter r3 of the third cylindrical portion 31d is substantially equal to the inner diameter r7.
Furthermore, the length d1 of the third cylindrical portion 31d in the vertical direction is larger than the length d2 from the bottom surface of the opening 32a to the lower surface of the claw 32b.
[0029]
Therefore, in the state where the outer peripheral surface of the second cylindrical portion 31c is in contact with the inner peripheral surface of the claw 32b and the outer peripheral surface of the third cylindrical portion 31d is in contact with the inner peripheral surface of the opening 32a, the protruding portion 31 is ( It can move up and down within the range of d2-d1). In other words, the support part 32 supports the protruding part 31 so as to be movable up and down within the range of (d2-d1). In addition, when the 2nd level | step difference 31f contact | abuts on the lower surface of the nail | claw 32b, it becomes the structure by which the upward movement of the protrusion part 31 is controlled.
The support portion 32 is fixed to the upper rail 2 by a bolt 32c and a nut 32d through an opening 2a formed on the upper surface of the upper rail 2.
[0030]
The sensor body 33 is provided to detect an applied load as an electrical signal, and a strain gauge is used in the present embodiment. The sensor main body 33 is disposed on the bottom surface of the opening 32a of the support portion 32, and the load transmission member 35 is positioned above the sensor main body 33.
Two terminals 33 a for transmitting electrical signals detected by the sensor body 33 are provided on the upper surface of the sensor body 33 so as to protrude upward. These terminals are located in the opening 31 a of the protrusion 31. .
[0031]
Then, by fitting the connector 40 (coupler) to the upper portion of the first cylindrical portion 31b, the terminal 33a of the sensor body 33 is connected to the terminal 40a on the connector 40 side in the opening 31a of the protruding portion 31. It has become. The connector 40 can move up and down integrally with the protrusion 31.
As described above, the load detection means 30 of the present invention is attached between the upper rail 2 and the cushion frame 3 and moves integrally with the movement of the vehicle seat in the front-rear direction. .
[0032]
Next, the operation of the measuring apparatus 10 will be described.
First, when an occupant sits on the vehicle seat, the occupant's load is transmitted to the bracket 20 via the cushion frame 3.
As described above, since the bracket 20 is fixed to the protruding portion 31 in contact with the first step 31e, the bracket 20 that receives a load from the cushion frame 3 starts to move downward. Accordingly, the protrusion 31 and the connector 40 also move downward.
[0033]
A thin plate-shaped load transmission member 35 is fitted to the lower portion of the protruding portion 31 in the third cylindrical portion 31d as described above, and the load transmission member 35 abuts on the upper surface of the sensor body 33 on the lower surface thereof. Thus, the sensor body 33 is pressed.
The sensor body 33 detects a load as an electric signal when pressed. In the present embodiment, since the load detection means 30 are attached to the front and rear of each of the left and right upper rails 2, the occupant weight is measured based on the electric signals detected by a total of four load detection means 30 (sensor body 33). Will be performed.
[0034]
The method for measuring the occupant weight is not particularly limited. For example, the front load detection means 30 and the rear load detection means 30 are respectively connected to a load estimation circuit (not shown) via the connector 40. In the load estimation circuit, the load center of gravity of the seat is calculated based on the electrical signal detected by the sensor body 33 of each load detection means 30, and the load applied to each load detection means 30 is calculated based on the calculated value. By correcting, an accurate occupant weight can be measured.
Further, by connecting an acceleration sensor (not shown) that detects acceleration acting in the longitudinal direction of the vehicle to the load estimation circuit, the load applied to each load detection means 30 based on the acceleration detected by the acceleration sensor It is good also as what correct | amends.
[0035]
As described above, according to the measuring device 10 shown in the present embodiment, the load detection means 30 is attached one by one between the upper rail 2 and the cushion frame 3 in the front-rear direction, and the vehicle seat is moved in the front-rear direction. It is configured to move together with the movement.
Therefore, in the same manner as the conventional measuring apparatus 10, it is possible not only to measure the occupant weight in consideration of the so-called escape load transmitted from the occupant's feet to the floor, which is generated when the occupant is seated or when the vehicle is accelerated or decelerated. Even when the vehicle seat moves in the front-rear direction, the load (occupant weight) transmitted from the vehicle seat to the load detection means 30 can always be kept constant, thus improving the measurement accuracy of the occupant weight. Can be made.
[0036]
In addition, since the protruding portion 31, the support portion 32, and the sensor body 33 are arranged on substantially the same straight line in the vertical direction, for example, swinging in the vertical direction within a vertical plane as conventionally known Loss of load compared to the configuration in which the load from the cushion frame 3 transmitted to one end of the arm-shaped member pivotally supported is transmitted to the sensor body 33 from the other end of the arm-shaped member. (Loss) can be reduced, and the measurement accuracy of the occupant weight can be improved.
[0037]
Further, by interposing the bracket 20 between the cushion frame 3 and the protruding portion 31, the mounting rigidity between the cushion frame 3 and the protruding portion 31 can be improved, so that a load loss (loss) is reduced, and the occupant weight is reduced. Measurement accuracy can be improved.
Further, since the connector 40 is fitted to the upper portion of the opening 31a of the projecting portion 31 and is connected to the sensor main body 33 inside the opening 31a, the wiring process is simplified and the space below the vehicle seat can be effectively used.
[0038]
The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the gist of the present invention.
For example, in the above-described embodiment, the load is transmitted to the sensor body 33 via the load transmission member 35 attached to the lower portion in the third cylindrical portion 31d. Instead of using the load transmission member 35, the load may be transmitted to the sensor body 33 by directly contacting the lower surface of the third cylindrical portion 31d with the sensor body 33.
[0039]
Moreover, the structure which fixes the protrusion part 31 to the cushion frame 3 directly without passing through the bracket 20 may be sufficient.
Further, by fitting the coupler to the upper part of the first cylindrical portion 31b, the terminal of the sensor main body 33 is connected within the opening of the protruding portion 31, but the present invention is not limited thereto. An opening may be provided on the side surface, and the coupler may be connected to the terminal of the sensor main body 33 through the opening.
[0040]
[Second Embodiment]
Hereinafter, a second embodiment of the measuring apparatus of the present invention will be described with reference to FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.
The measuring device 50 according to the present embodiment is also joined to the cushion frame 3 via the bracket 20 and is schematically configured by a load detection means 60, a connector 40, and the like.
[0041]
The load detection means 60 is generally composed of a protruding portion 61, a support portion 62, and a sensor main body 63.
The protruding portion 61 is fixed to the bracket 20 by a nut 61b in a state where a bolt 61a provided at the upper portion is inserted into the opening 24 of the bracket 20.
The lower portion 61c of the protruding portion is housed in the opening 62a of the support portion 62, and a contact portion 61d protruding in the horizontal direction from the peripheral edge thereof is fixed in a state of being in contact with the upper surface of the support portion 62. The entire protruding portion 61 bends in the vertical direction within the opening 62a of the support portion 62. In other words, the support part 62 supports the protruding part 61 so as to be movable up and down.
Further, the support portion 62 is fixed to the upper rail 2 with screws 62b through the opening 2a on the upper surface of the upper rail 2.
[0042]
The sensor main body 63 is provided to detect an applied load as an electric signal, and a strain gauge is used also in the present embodiment. The sensor body 63 is attached to the lower surface of the lower portion 61 c of the protruding portion, and moves up and down integrally with the protruding portion 61.
On the lower surface of the sensor main body 63, two terminals 63a for transmitting an electric signal detected by the sensor main body 63 are provided.
[0043]
Then, by fixing the connector 40 (coupler) to the side surface of the support portion 62, the terminal 63a of the sensor body 63 is connected to the terminal 40a on the connector 40 side via the cord 63b in the opening 62a of the support portion 62. It is like that.
As described above, the load detection means 60 of the present invention is also attached between the upper rail 2 and the cushion frame 3, and moves together with the movement of the vehicle seat in the front-rear direction. .
[0044]
When the occupant sits on the vehicle seat, the occupant's load is transmitted to the bracket 20 via the cushion frame 3.
As described above, since the bracket 20 is fixed to the protruding portion 61 by the bolt 61a and the nut 61b, the bracket 20 that receives the load from the cushion frame 3 starts to move downward, and the protruding portion 31 is accompanied by this movement. The lower part 61c of the sword is bent downward.
Then, the sensor body 63 (strain gauge) detects this bending as an electric signal, whereby the load is measured.
[0045]
【The invention's effect】
According to the present invention , since the load detection means is arranged between the upper rail and the cushion frame, the load detection means can be moved in the front-rear direction integrally with the upper rail. Therefore, the load (occupant weight) transmitted to the load detection means can always be kept constant regardless of the position of the vehicle seat in the front-rear direction, and the measurement accuracy can be improved.
[0046]
According to the present invention, collision detection section, the support section, by disposing the sensor body substantially collinear in the vertical direction, for example, swingably supported in the vertical direction in the vertical plane by an arm-like member Compared with the configuration in which the load from the cushion frame transmitted to one end of the arm is transmitted from the other end of the arm-shaped member to the sensor body, it is possible to reduce the load loss. Accuracy can be improved.
[0047]
According to the present invention, by interposing the bracket, improves mounting rigidity of the cushion frame and the protrusion, the loss of load (loss) is not less, you are possible to improve the measurement accuracy.
[0048]
According to the present invention, since the connection with the sensor body in the inside of the opening as well as arranging the connector at the top of the opening of the protrusion, it is assumed that the wiring process is simplified, effective space of the seat lower vehicle Available.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a structure of a vehicle seat.
FIG. 2 is a perspective view of a main part showing the structure of a vehicle seat occupant weight measuring device.
FIG. 3 is a longitudinal sectional view of a main part showing the structure of an occupant weight measuring device for a vehicle seat.
FIG. 4 is a longitudinal sectional view of an essential part showing the structure of a vehicle seat occupant weight measuring device.
FIG. 5 is a perspective view showing a main part of the structure of a conventional measuring apparatus.
FIG. 6 is a side view of the main part showing the structure of a conventional measuring apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower rail 2 Upper rail 3 Cushion frame 10 Vehicle passenger | crew occupant weight measuring apparatus 20 Bracket 30 Load detection means 31 Protrusion part 31a Opening 32 Support part 33 Sensor main body 40 Connector 50 Vehicle passenger | crew occupant weight measuring apparatus 60 Load detection means 61 Protruding part 62 Supporting part 63 Sensor body

Claims (3)

An occupant weight measuring device for a vehicle seat that is attached to a vehicle seat and measures the weight of a seated person,
Arranged between an upper rail that moves back and forth on a lower rail fixed to the vehicle and a cushion frame that is disposed above the upper rail and forms a part of the seat surface, and hangs on the front and rear of the vehicle seat Provided with load detection means for detecting each load,
The load sensing means, e Bei a protruding portion fixed to the cushion frame side, and said support portion for supporting the protruding portion is fixed to the upper rail side relatively vertically movable,
The protrusion includes an opening penetrating in the vertical direction;
Connector for power supply to the sensor body, occupant weight measurement device for a vehicle seat, characterized in be tied to the sensor body at the inside of the opening while being disposed above the said opening.   The occupant weight measuring device for a vehicle seat according to claim 1, wherein a sensor main body of the load detecting means is interposed between the protruding portion and the support portion, and the load from a cushion frame is the protruding portion. The vehicle seat occupant weight measuring device is transmitted to the sensor body via An occupant weight measuring device for a vehicle seat according to claim 1 or 2,
An occupant weight measuring device for a vehicle seat, wherein a bracket is interposed between the cushion frame and the protruding portion.

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