JP4669637B2 - Seat weight measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for measuring a seat weight including the weight of an occupant sitting on a vehicle seat. In particular, the present invention relates to a seat weight measuring apparatus having advantages such as that design conditions and breaking strength are not easily influenced by the seat slide position.
[0002]
[Related technologies]
Automobiles are equipped with seat belts and airbags as equipment for ensuring the safety of passengers. Recently, in order to further improve the performance of seat belts and airbags, there is a trend to control the operation of these safety equipment according to the weight (weight) of the occupant. For example, the deployment gas amount and deployment speed of the airbag are adjusted according to the weight of the occupant, and the pretension strength of the seat belt is adjusted. For that purpose, it is necessary to know the weight of the passenger sitting on the seat by some means.
[0003]
Some seat weight measuring apparatuses having such a purpose use a strain gauge as a load sensor. This type of load sensor needs to have sufficient detection accuracy and breaking strength. Specifically, the detection accuracy of the load in the gravity direction of the load sensor is required to be able to detect a load fluctuation of about 100 g. This accuracy is required to be unaffected even when a load other than the gravity direction is applied by 100 kg. On the other hand, regarding the strength of the load sensor, it is required not to break even when a large load is applied in the event of a vehicle collision. Examples of load sensors that satisfy such conditions include Japanese Patent Publication No. H11-304579, Japanese Patent Publication No. H11-351952, Japanese Patent Publication No. 2000-258233, Japanese Patent Application No. 2000-122068. , Japanese Patent Publication No. 2001-12998, and the like.
[0004]
Hereinafter, an example of a seat weight measuring apparatus as a prerequisite technique of the present invention will be described with reference to the drawings.
FIG. 9 is a front view showing an example of a seat weight measuring apparatus.
FIG. 10 is a side view showing a vehicle seat provided with the seat weight measuring device of FIG. (A) is a figure which shows the case where a sheet | seat is in a normal arrangement | positioning (seat center state), (B) is a figure which shows the case where a sheet | seat is in a front most arrangement | positioning (seat front movement limit state), (C) These are figures which show the case where a sheet | seat is in rearmost arrangement | positioning (seat back movement limit state).
In the present specification, the top, bottom, front, back, left and right indicate the directions of the arrows in each figure.
[0005]
As shown in these drawings, the side frame 103 hangs down from the seat pan 102 on the lower surface of the seat 101. An upper rail 105 is connected to the lower end portion of the side frame 103. The upper rail 105 is assembled to the lower rail 107 so as to be slidable back and forth.
On the other hand, a vehicle body bracket 111 is fixed to the upper surface of the vehicle floor 110. A seat weight measuring device 120 having a load sensor (strain gauge) is disposed between the rail bracket 109 (not shown in FIG. 9) on the lower surface of the lower rail 107 and the vehicle body bracket 111. The side frame 103, the upper rail 105, the lower rail 107, and the seat weight measuring device 120 are provided on both the left and right sides of the seat 101.
[0006]
As shown in FIG. 9, the seat weight measuring device 120 uses an upwardly U-shaped base 122 as a base. The base 122 and the lower rail 107 are connected via a pin bracket 125. The upper end of the pin bracket 125 is fixed to the lower surface of the lower rail 107. The pin bracket 125 is disposed inside the base 122 and is pivotally supported by a bracket pin 113. As shown in FIG. 10, in each of the left and right seat weight measuring devices 120 of the seat 101, the load sensor 121 is configured by a strain gauge that is arranged at the front and back with the center in the longitudinal direction of the base 122 interposed therebetween. The measured value of the strain gauge is transmitted to an ECU (not shown).
[0007]
[Problems to be solved by the invention]
However, the seat weight measuring device 120 has the following problems.
As shown in FIG. 10A, when the seat 101 is in the normal arrangement, there is no problem because the load from the seat 101 is equally applied to the front and rear load sensors 121. However, as shown in FIG. 10B, when the seat 101 is in the front most arrangement, there is a possibility that a larger load is applied to the front load sensor 121F than to the rear load sensor 121R. Conversely, as shown in FIG. 10C, when the seat 101 is in the rearmost arrangement, the rear load sensor 121R may be loaded with a larger load than the front load sensor 121F.
[0008]
In order to cope with this more appropriately, it is necessary to take measures to enhance durability, such as making the periphery of the load sensor robust.
Furthermore, as shown in FIG. 10, when the seat weight measuring device 120 is fixed directly to the vehicle floor 110 via the vehicle body bracket 111, the seat weight measuring device 120 is placed on the floor surface in order to increase the measurement accuracy. A structure that is not easily affected by manufacturing errors is preferable.
Alternatively, as shown in FIG. 9, in the case where the pin bracket 125 is fixed to the lower surface of the lower rail 107, the holes through which the bracket pins 113 are inserted when the lower rail 107 and the base 122 are assembled (the pin bracket 125, the base 122, and The adjustment of the relative position of each hole) of the arm 127 is preferably easier.
[0009]
The present invention has been made in view of such problems, and an object of the present invention is to provide a seat weight measuring apparatus having advantages such as that design conditions and breaking strength are not easily affected by the seat slide position.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is connected with A seat weight measuring device is a device for measuring a seat weight including the weight of an occupant sitting on a vehicle seat, a base member having a U-shaped recess, and a sensor housed in the recess of the base member The base member is connected to the frame of the seat, the sensor unit is connected to a seat rail that slides in the vehicle front-rear direction, and the recess of the base member is on the vehicle floor side. It arrange | positions so that it may open, It is characterized by the above-mentioned.
[0011]
Since the seat weight measuring device is disposed between the seat frame and the seat rail, the relative position between the seat position and the seat weight measuring device does not change even if the seat is in the front most arrangement or the rear most arrangement. Since the center of gravity position of the seat when the baggage is not placed is held constant with respect to the seat weight measuring device, the load from the seat is relatively uniformly applied to the four load sensors. Therefore, the measurement environment of the apparatus becomes stable. Furthermore, the design conditions of the apparatus are simplified, and the design strength can be lowered. Alternatively, there is an advantage that the breaking strength at the time of the accident of the seat weight measuring device itself is not affected by the seat slide position. Further, since the concave portion of the base member is arranged so as to open toward the floor (lower side) of the vehicle, unlike the case where the concave portion opens upward, the necessity of attaching a cover to the concave portion is reduced.
[0012]
Further, if the seat rail is interposed between the vehicle floor and the seat weight measuring device in this way, the stress generated in the seat weight measuring device is absorbed by the clearance generated by the sliding connection of the seat rail, The measurement accuracy of the apparatus can be secured without being affected by manufacturing errors on the vehicle floor surface.
The purpose of the seat weight measuring device referred to in this specification is basically to measure the weight of an occupant on the seat. Therefore, a device that cancels the weight of the seat itself and measures only the weight of the occupant is also included in the seat weight measuring device referred to in this specification.
[0013]
The present invention The The seat weight measuring device is a device for measuring a seat weight including the weight of an occupant sitting on a vehicle seat, and is mounted on the base member connected to the frame of the seat, And a sensor part connected to a seat rail that slides in the longitudinal direction of the vehicle, wherein the sensor part has a strain sensor fixed to the base member, and a pressing part that transmits force to the strain sensor. And a connecting member that is pivotally supported by the arm and that can be connected to the seat rail with flexibility in attachment position.
[0014]
In this seat weight measuring apparatus, since the attachment position of the connecting member is flexible, it is easier to adjust the relative positional relationship when the base member and the arm are assembled.
[0015]
In the seat weight measuring device of the present invention, the seat weight measuring apparatus includes a plurality of bolts for connecting the connecting member to the seat rail, and these bolts are inserted into a fool hole formed in the seat rail and fastened with a nut. Can be.
In this case, since the mounting error is absorbed by the fool hole in which the shaft portion of the bolt is inserted, the position adjustment at the time of assembly becomes easy. Also, when it is necessary to pass the pin during assembly, it is easy to pass the pin.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
In the following description, the size, shape, arrangement relationship and the like of each component in the drawings are merely schematically shown to facilitate understanding of the present invention. The numerical conditions described below are merely examples.
[0017]
FIG. 1 is a side sectional view showing the overall configuration of a seat weight measuring apparatus according to one embodiment of the present invention.
FIG. 2 is a front view of the seat weight measuring apparatus.
FIG. 3 is a side cross-sectional view showing a central portion and a latter half portion of the seat weight measuring apparatus.
FIG. 4 is a perspective view showing details of the base member end and the Z arm of the seat weight measuring apparatus.
[0018]
FIG. 5 is a partially broken perspective view showing a detailed configuration around the sensor plate of the seat weight measuring apparatus.
FIG. 6 is a side view schematically showing the relationship between the sensor plate and the half arm of the seat weight measuring apparatus. (A) shows a no-load state, and (B) shows a state where a load is applied.
FIG. 7 is a side view showing a vehicle seat equipped with a seat weight measuring device according to the present invention. (A) is a figure which shows the case where a sheet | seat is in a normal arrangement | positioning (seat center state), (B) is a figure which shows the case where a sheet | seat is in a front most arrangement | positioning (seat front movement limit state), (C) These are figures which show the case where a sheet | seat is in rearmost arrangement | positioning (seat back movement limit state).
[0019]
First, the structure around the vehicle seat will be described with reference to FIG.
FIG. 7 shows a typical vehicle seat 1. A person sits on the seat cushion 1a of the seat 1. A seat pan 2 made of a steel plate is provided on the lower surface of the seat cushion 1a. The seat pan 2 spreads so as to cover the lower surface of the seat cushion 1a. The seat pan 2 is supported by a side frame 3 made of steel plate. The side frame 3 is supported by the upper rail 11 via the rail bracket 5 and the seat weight measuring device 10. A lower rail 15 is slidably combined under the upper rail 11. The lower rail 15 is supported by a vehicle body bracket 9 fixed to the vehicle floor 7. The side frame 3, the seat weight measuring device 10, the upper rail 11, the lower rail 15, and the vehicle body bracket 9 are mounted on the left and right sides of the seat 1. Both rails 11 and 15 extend in the front-rear direction.
[0020]
As shown in FIG. 2, the upper rail 11 in this example has a U-shaped cross-section and includes an upper plate portion 12, a side plate portion 13, and a slide portion 14. As shown in FIGS. 1 and 2, the upper plate portion 12 has a plurality of fool holes 12 </ b> A. The staggered hole 12A is a hole that is slightly larger than the shaft diameter of a bolt 45 described later. The side plate part 13 hangs down from both the left and right sides of the upper plate part 12. The slide part 14 is formed in a bowl shape upward from the lower end of the side plate part 13, and the tip part is bent upward.
[0021]
The lower rail 15 is composed of a lower plate portion 16 and a guide portion 17, and a concave groove portion 18 exists inside. A lower end portion of the upper rail 11 is contained in the groove portion 18. The guide portion 17 of the lower rail 15 is bent in a hook shape downward from both ends of the lower plate portion 16, and the tip end portion is bent downward. Inside the guide portion 17 of the lower rail 15, the tip end portion of the slide portion 14 of the upper rail 11 is contained. The upper rail 11 can slide in the front-rear direction within the lower rail 15.
The upper rail 11 and the lower rail 15 constitute a seat rail.
[0022]
Hereinafter, details of the seat weight measuring apparatus 10 will be described.
As shown in FIGS. 1 to 3, the seat weight measuring apparatus 10 includes an elongated base member 21. As shown in FIG. 2 in an easy-to-understand manner, the base member 21 is a steel plate press product with a front cross-section facing downward U-shaped. Since the U-shaped opening of the base member 21 faces downward, there is no need to consider attaching a cover or the like. In this base member 21, the section of the ceiling in the cross section is called a base upper plate portion 22, and portions that are bent by 90 ° from the left and right ends of the base upper plate portion 22 and hang left and right are base side plate portions 23 (23 </ b> L, 23 </ b> R). Call.
[0023]
As shown in FIGS. 1 and 2, the base upper plate portion 22 has a plurality of holes 22A at predetermined positions. Bolts 47 are inserted into the holes 22A from the inside of the base member 21 and fixed by welding or the like. The shaft portion (screw portion) of each bolt 47 is exposed above the base upper plate portion 22. These bolts 47 are inserted into the hole 5A of the rail bracket 5 of the seat and fastened with a nut (not shown) (details will be described later).
In each of the left and right base side plate portions 23, a long hole 23A and a pin hole 23B are formed at two positions near the front and rear ends, as shown in FIG. The holes 23A and 23B are opened to face both the left and right base side plate portions 23L and 23R.
[0024]
As shown in FIGS. 1 to 4, a bracket pin 24 is inserted into a long hole 23 </ b> A opened near the front and rear ends of the base member 21. As shown in FIGS. 2 and 4, a flange 24 a is formed at the left end of the bracket pin 24. The right end of the bracket pin 24 penetrates the base side plate portion 23R on the right side and protrudes outward (see FIG. 2). There is a gap between the bracket pin 24 and the long hole 23A, and the bracket pin 24 usually does not touch the inner edge of the long hole 23A. However, when an excessive load is applied to the base member 21, the base member 21 is lowered and hits the upper edge of the long hole 23 </ b> A, and the excess load is directly transmitted to the connecting member 40 described later. It does not act on the sensor plate 51 (detailed later).
[0025]
As shown in FIG. 4, in the base member 21, a pin hole 23B is opened adjacent to the long hole 23A (near the center of the base). As shown in FIGS. 1 and 4, the base pin 25 is inserted into the pin hole 23B. The base pin 25 is spanned and fixed between the left and right base side plate portions 23L and 23R.
[0026]
A Z arm 31 is disposed inside the base member 21. As shown in FIG. 4, the Z-arm 31 has a planar shape in which the central portion is divided into left and right bifurcated portions (central forked portion 32), and the front and rear end portions are rectangular. On both the left and right sides of the Z arm 31 near the front and rear ends, arm side plate portions 33 (33L, 33R) are formed that are folded downward by 90 °. The central fork 32 has a simple flat plate shape. As shown in FIG. 2, the arm side plate portion 33 is assembled along the inner side of the base side plate portion 23. However, a slight gap exists between the base side plate portion 23 and the arm side plate portion 33.
[0027]
As shown in FIG. 4, holes 33 </ b> A and 33 </ b> B are also formed in the arm side plate portion 33 of the Z arm 31 at positions corresponding to the long holes 23 </ b> A and the pin holes 23 </ b> B of the base side plate portion 23. As easily shown in FIGS. 2 and 4, the bracket pin 24 passes through the hole 33 </ b> A (hole corresponding to the long hole 23 </ b> A) near the front and rear ends of the Z arm 31. The bracket pin 24 is a rotation center axis of the Z arm 31, and sliding corresponding to the rotation of the Z arm 31 occurs between the pin 24 and the Z arm 31. The base pin 25 passes through a hole 33B (a hole corresponding to the pin hole 23B) closer to the center of the Z arm 31. The base pin 25 is pivotally engaged with both the base member 21 and the Z arm 31, transmits a load applied to the base member 21 to the Z arm 31, and rotates the Z arm 31 as shown in FIG. As described above, since there is a gap of the long hole 23A between the bracket pin 24 and the base member 21, the base member 21 and the bracket pin 24 do not interfere with each other at normal times.
[0028]
As described above and as easily shown in FIG. 4, the central fork 32 of the Z arm 31 is divided into left and right parts and extends toward the center in the front-rear direction, and is narrow toward the center. As clearly shown in FIG. 5, the action portion 32 a at the tip of the central fork portion 32 is sandwiched between the blade portions 35 a and 36 a of the upper and lower half arms 35 and 36. When a load is applied to the base member 21, the Z arm 31 is slightly rotated as shown in FIG. 3, and the action portion 32 a at the arm end transmits the load to the sensor plate 51 via the half arms 35 and 36.
[0029]
As shown in FIG. 2, backlash springs 29 are fitted inside and outside the side plate portions 33 </ b> R and 33 </ b> L of the Z arm 31. The backlash spring 29 has a spring washer-like portion with a hole, and plays a role of absorbing backlash between the base member 21 and a connecting member 40 described later.
[0030]
As shown in FIGS. 1 and 3, a connecting member 40 is disposed inside the base member 21 near the front and rear ends. The connecting member 40 is a member that connects the bracket pin 24 and the upper rail 11. The connecting member 40 is formed by overlapping an upper bracket plate 42 and a lower bracket plate 41. The upper bracket plate 42 has a central raised portion 42a, an inclined portion 42c, and a flat plate portion 42b. The central raised portion 42a is bent in a circular arch shape. The inclined portion 42c extends obliquely downward in the front-rear direction from both lower ends of the central raised portion 42a. The flat plate portion 42b extends horizontally from each inclined portion 42c to both sides in the front-rear direction. Each flat plate portion 42b has a hole 42d.
[0031]
The lower bracket plate 41 has a central raised portion 41a and a flat plate portion 41b. The central raised portion 41a is bent in a substantially trapezoidal arch shape. As shown in FIGS. 1 and 3, the outer surface ridge portion of the central raised portion 41 a contacts the inside of the inclined portion 42 c below the central raised portion 42 a of the upper bracket plate 42. At this time, a space is formed between the central inclined portions 42a and 41a of the upper and lower bracket plates 42 and 41, and the bracket pin 24 is inserted into the space. The flat plate portion 41b of the lower bracket plate 41 extends horizontally from both lower ends of the central raised portion 41a to both sides in the front-rear direction. Each flat plate portion 41b is formed with a hole 41d at a position corresponding to the hole 42d of the upper bracket plate 42.
The holes 40d (42d and 41d) are holes for passing bolts 45 described later.
[0032]
In order to integrate the upper and lower bracket plates 42 and 41 of the connecting member 40, the upper and lower bracket plates 42 and 41 are overlapped as shown in FIGS. 1 to 3, and an unillustrated treatment is provided in the space between the central inclined portions 42 a and 41 a. Hold the tool. The jig having the same dimensions as the bracket pin 24 is used. Then, these two bracket plates 42 and 41 are welded with the jig sandwiched therebetween, and the jig is removed after the welding is completed. In this way, the connecting member 40 having a highly accurate space is obtained. The reason why the connecting member 40 has such a two-plate structure is to make the height in the vertical direction as low as possible.
[0033]
Next, the configuration of the load sensor 50 of the seat weight measuring device will be described.
As shown in FIGS. 3, 5, and 6, a load sensor 50 is provided at the center in the longitudinal direction of the base member 21. As shown in FIG. 5, a sensor plate (spring material) 51, which is a main component of the load sensor 50, is a rectangular plate with two constrictions 51c as a whole. The sensor plate 51 is firmly fixed to the column 63 at the center of the base upper plate portion 22 with a washer 67 and a nut 68.
[0034]
On the sensor plate 51, an insulating layer for electrical insulation, a wiring layer, and a resistance layer are formed. And the four distortion resistances 54a-54d which comprise the load sensor 50 are formed by such a film-forming method. These four strain resistors 54a to 54d are connected so as to form a bridge circuit. The measured values of the strain resistors 54a to 54d are transmitted to an ECU (not shown). A more detailed description of such a load sensor 50 is shown, for example, in Japanese Patent Publication No. 2000-258233. Instead of detecting the strain of the sensor plate 51 by the strain resistors 54a to 54d, the deflection of the sensor plate 51 may be detected by a capacitance sensor, a Hall element, or the like, and the deflection may be converted into a load.
[0035]
As shown in FIGS. 3, 5, and 6, the half arms 35 and 36 are front / rear / upper / lower four-piece components, and are assembled so that the front and rear of the sensor plate 51 are sandwiched from above and below. Since the individual half arms 35 and 36 have the same shape, the lower half arm 36 will be described.
The half arm 36 is a rectangular plate-like body, and an attachment hole 36e (see FIG. 6) is opened at the center of the base portion. As shown in FIG. 5, a blade portion 36 a that protrudes on both sides in the lateral direction is formed at the edge portion near the center of the half arm 36. A bank-shaped fulcrum 36b extending in the left-right direction is formed on the rear surface of the blade portion 36a. The tip of the fulcrum 36b is a slightly sharp ridge.
[0036]
Here, an assembly structure of the upper and lower half arms 35 and 36, the sensor plate 51, and the action portion 32a of the Z arm 31 will be described.
As shown in FIG. 3, FIG. 5, and FIG. 6, the base portions of the upper half arm 35 and the lower half arm 36 are perfectly fitted to the surface of the sensor plate 51 and fixed with bolts 39. The blade portions 35a and 36a of the upper and lower half arms 35 and 36 face each other with the fulcrums 35b and 36b facing each other. The action portion 32a of the Z arm 31 is sandwiched between both fulcrums 35b and 36b. Note that the positions of the fulcrums 35b and 36b are located exactly in the middle of the two strain resistors 54a and 54c or 54d and 54b (constriction 51c portion of the sensor plate 51).
[0037]
When a load is applied to the seat weight measuring apparatus 10, as shown in FIG. 3, the Z arm 31 is slightly rotated around the bracket pin 24, and the arm action portion 32a is pressed downward. FIG. 6B schematically shows the state of the sensor plate 51 and the half arms 35 and 36 at this time in an exaggerated manner. When the Z arm action part 32a is lowered, the fulcrum 36b of the lower half arm 36 is pushed down. For this reason, a moment M is applied to the front-rear direction end of the sensor plate 51. A resistance change of each of the strain resistors 54a to 54d accompanying the moment M is taken out as an electrical signal, the strain of the sensor plate 51 is measured, and the load applied to the seat weight measuring device 10 is measured by the ECU.
[0038]
Next, a method for assembling the seat weight measuring apparatus 10 having the above-described configuration between the upper rail 11 and the side frame 3 will be described mainly with reference to FIGS. 1 and 2.
First, the connecting member 40 is placed on the upper rail 11, the pin insertion space of the connecting member 40 and the hole 33A of the Z arm 31 are exactly matched, and the bracket pin 24 is inserted therein (see FIG. 2). In addition, in each hole 40d before and behind the connecting member 40, a bolt 45 is inserted from the upper side of the drawing, and the screw portion protrudes downward as shown in FIGS. Then, the screw portion of the bolt 45 is inserted into a fool hole 12A (a hole slightly larger than the screw portion of the bolt 45) drilled in the upper rail 11, and tightened with a nut 46 from the inside of the upper rail 11.
[0039]
In the seat weight measuring device 10 of the present embodiment, the two front and rear connecting members 40 are structured to be independently supported by the two front and rear bracket pins 24, so the bracket pin 24, the hole 33A of the Z arm 31, Adjustment of each relative positional relationship with the space of the connecting member 40 can be performed much more easily than in the case of a structure in which two connecting members (rail brackets) are integrally fixed to the lower rail as in the prior art. it can.
[0040]
On the other hand, in order to assemble the side frame 3 on the seat weight measuring apparatus 10, the shaft portions of the plurality of bolts 47 welded and fixed to the base upper plate portion 22 are inserted into the fool holes 5 </ b> A formed in the rail bracket 5 of the seat. Insert. In this state, a nut (not shown) is fastened to the threaded portion of the bolt 47 from above the rail bracket 5. At this time, the plurality of bolts 47 fixed to the base upper plate portion 22 and the corresponding holes 5A of the seat bracket 5 are linearly aligned, and all the bolts 47 are inserted into the corresponding holes 50A. Tighten the nut in a state where it is pressed against the predetermined side. In this way, the seat weight measuring device 10 can be accurately positioned with respect to the side frame 3.
[0041]
The seat weight measuring apparatus 10 having such a configuration has the seat 1 and the seat weight even when the seat 1 is in the front most arrangement shown in FIG. 7B or the rear most arrangement shown in FIG. The relative position of the measuring device 10 does not change. For this reason, it is possible to reduce the longitudinal load caused by the seat slide applied to the load sensor 50, and the measurement environment of the apparatus becomes stable. Alternatively, there is an advantage that the breaking strength at the time of the accident of the seat weight measuring device itself is not affected by the seat slide position.
[0042]
Alternatively, even when the occupant is out of position (when the occupant is seated on the seat 1 with a deviation from the normal position), the degree of load being applied only to the specific strain resistances 54a to 54d is reduced. Therefore, the design conditions of the members (for example, the rail bracket 5, the bracket pin 24, the base member 21, the base pin 25, the Z arm 31) that receive the load of the load sensor 50 are simplified, and the design strength can be lowered. The sheet weight measuring device 10 can be reduced in size and weight (for example, the thickness of the steel plate is reduced or the parts are reduced).
[0043]
In the present invention, the upper rail 11 and the lower rail 15 are interposed between the vehicle floor 9 and the seat weight measuring device 10. Therefore, even when there is a possibility that assembly stress is generated in the seat weight measuring device 10 due to the influence of the upper surface of the vehicle floor 9, this assembly stress is a clearance generated between the sliding connection between the upper rail 11 and the lower rail 15. Absorbed. Therefore, since the influence of the upper surface of the vehicle floor 9 does not easily affect the seat weight measuring device 10, the measurement accuracy of the device can be sufficiently ensured.
[0044]
Furthermore, since the opening of the base member 21 faces downward, even if dust or the like enters from the outside, it is difficult to accumulate in the base member 21. Therefore, a cover or the like for closing the opening of the base member 21 is not required, and cost reduction and weight reduction can be achieved. It is more preferable to use a small cover that covers only the periphery of the strain resistors 54a to 54d.
[0045]
In addition, the seat weight measuring apparatus of a present Example can also be comprised as shown, for example in FIG.
FIG. 8 is a front view showing another example of the seat weight measuring apparatus according to the present invention.
The seat weight measuring device 120 shown in FIG. 8 has the same configuration as that of FIG. As described above, when the base opening portion is upward, it is preferable that the flange portion 80 is formed at the lower end of the side frame 3 and the base opening portion is covered with the flange portion 80. Alternatively, as shown in FIG. 8, the upper portion of the upper rail 105 may have a vertically long structure with a T-shaped cross section.
[0046]
【The invention's effect】
As is apparent from the above description, according to the present invention, a seat weight measuring device having advantages such as that the design conditions and the breaking strength are not affected by the seat slide position can be provided.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an overall configuration of a seat weight measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a front view of the seat weight measuring apparatus.
FIG. 3 is a side cross-sectional view showing a central portion and a rear half portion of the seat weight measuring apparatus.
FIG. 4 is a perspective view showing details of an end portion of a base member and a Z arm of the seat weight measuring apparatus.
FIG. 5 is a partially broken perspective view showing a detailed configuration around a sensor plate of the seat weight measuring apparatus.
FIG. 6 is a side view schematically showing a relationship between a sensor plate and a half arm of the seat weight measuring apparatus. (A) shows a no-load state, and (B) shows a state where a load is applied.
FIG. 7 is a side view showing a vehicle seat equipped with a seat weight measuring device according to the present invention.
(A) is a figure which shows the case where a sheet | seat is in a normal arrangement | positioning (seat center state), (B) is a figure which shows the case where a sheet | seat is in a front most arrangement | positioning (seat front movement limit state), (C) These are figures which show the case where a sheet | seat is in rearmost arrangement | positioning (seat back movement limit state).
FIG. 8 is a front view showing another example of the seat weight measuring apparatus according to the present invention.
FIG. 9 is a front view showing an example of a seat weight measuring apparatus.
10 is a side view showing a vehicle seat provided with the seat weight measuring device of FIG. 9. FIG. (A) is a figure which shows the case where a sheet | seat is in a normal arrangement | positioning (seat center state), (B) is a figure which shows the case where a sheet | seat is in a front most arrangement | positioning (seat front movement limit state), (C) These are figures which show the case where a sheet | seat is in rearmost arrangement | positioning (seat back movement limit state).
[Explanation of symbols]
1 seat 1a seat cushion
2 Seat pan 3 Side frame
5 Rail bracket 5A Stupid hole
7 Vehicle floor 9 Body bracket
10 Seat weight measuring device
11 Upper rail
12 Upper plate part 12A Stupid hole
13 Side plate part 14 Slide part
15 Lower rail
16 Lower plate part 17 Guide part
18 groove
21 Base member
22 Base upper plate 22A Hole
23 (23L, 23R) Base side plate portion 23A Long hole
23B Pin hole 24 Bracket pin
25 Base pin 29 Backlash spring
31 Z-arm
32 Central fork 32a Action part
33 (33L, 33R) Arm side plate 33A, 33B Hole
35, 36 Half arm 35a, 36a Blade
35b, 36b fulcrum
40 connecting members
41 Lower bracket plate 41a Central raised part
41b Flat plate portion 41d Hole
42 Upper bracket plate 42a Central raised portion
42b Flat plate part 42c Inclined part
42d hole 45, 47 bolt
50 Load sensor
51 Sensor plate 54a-54d Strain resistance
80 Flange part 120 Seat weight measuring device

Claims (2)

An apparatus for measuring a seat weight including the weight of an occupant sitting on a vehicle seat,
A base member connected to the frame of the seat;
A sensor unit mounted on the base member and connected to a seat rail that slides in the vehicle longitudinal direction; and
Comprising
The sensor unit is
A strain sensor fixed to the base member;
An arm provided at one end with a pressing portion for transmitting force to the strain sensor;
A connecting member pivotally supported by the arm and connectable to the seat rail with flexibility in attachment position;
A seat weight measuring device comprising: A plurality of bolts for connecting the connecting member to the seat rail;
These bolts, the are inserted into the fool hole drilled in the seat rail according to claim 1 Symbol placement of the seat weight measuring apparatus, characterized in that it is fastened with a nut.

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