WO2006035533A1 - Dispositif de détection de charge de siège - Google Patents

Dispositif de détection de charge de siège Download PDF

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Publication number
WO2006035533A1
WO2006035533A1 PCT/JP2005/011538 JP2005011538W WO2006035533A1 WO 2006035533 A1 WO2006035533 A1 WO 2006035533A1 JP 2005011538 W JP2005011538 W JP 2005011538W WO 2006035533 A1 WO2006035533 A1 WO 2006035533A1
Authority
WO
WIPO (PCT)
Prior art keywords
torsion bar
torsion
seat
detection device
seat load
Prior art date
Application number
PCT/JP2005/011538
Other languages
English (en)
Japanese (ja)
Inventor
Kiyohiro Fukaya
Yukihiro Kato
Original Assignee
Aisin Seiki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2004372140A external-priority patent/JP3797376B2/ja
Application filed by Aisin Seiki Kabushiki Kaisha filed Critical Aisin Seiki Kabushiki Kaisha
Publication of WO2006035533A1 publication Critical patent/WO2006035533A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B60N2/07—Slide construction
    • B60N2/0722—Constructive details
    • B60N2/0732—Attachment of seat frame to the slide, e.g. eyelets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B60R21/0152—Passenger detection systems using force or pressure sensing means using strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
    • G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
    • G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
    • G01G19/4142—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only for controlling activation of safety devices, e.g. airbag systems

Definitions

  • the present invention relates to a seat load detection device that detects a seat load that acts on a seating portion of a seat for a vehicle or the like.
  • a veg vehicle that aims to improve safety for passengers such as automobiles has a seat belt holding function depending on whether or not the passenger is seated on the seat, the weight of the seated passenger, etc.
  • the operation function of the airbag is controlled. In carrying out these controls, it is necessary to accurately detect the seat load, which is the weight of the occupant acting on the seat.
  • a strain generating plate which is composed of a flat body extending in the horizontal direction and has a strain gauge attached to the surface thereof, and one end side of the strain generating plate is provided.
  • the other end of the strain plate is fixed to the seat side, and the seat load is detected by the change in the electrical resistance of the strain gauge accompanying the strain of the strain plate.
  • a hall element and a magnet are provided as load detection portions on the seat side and the vehicle floor side at predetermined intervals, and the hall element and the magnet are relatively displaced when a load is applied to the seat.
  • the seat load weight detector for detecting seat load (e.g., see Patent Document 2.)
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2003-83798
  • Patent Document 2 Japanese Patent Laid-Open No. 2003-97998
  • the plate thickness of the strain plate is also relatively thick. The rate of change in the electrical resistance of the strain gauge affixed to the plate may lead to a decrease in detection accuracy.
  • the strain state of the strain gauge attached to the surface of the strain generating plate with respect to the sheet load is the distance of the acting point force of the sheet load. Therefore, to improve the sheet load detection accuracy, it is necessary to accurately manage the position where the strain gauge is attached on the surface of the strain plate.
  • the strain state of the strain plate is relatively complicated, the state of change in the electrical resistance of the strain gauge attached to the surface of the strain plate with respect to changes in seat load is relatively complex. As a result, the seat load cannot be detected widely and accurately.
  • the seat load detection device described in Patent Document 2 employs a set of hole elements and magnets as a load detection unit, and the displacement due to the sag of the strain generating body is detected relative to the Hall elements and the magnets. It is configured to detect as a displacement.
  • the present invention has been made in view of the above-mentioned problems, and its purpose is that it can be relatively miniaturized and has excellent detection accuracy. Furthermore, an important component such as dust is used for load detection.
  • the object is to provide a seat load detection device that can prevent foreign objects from entering.
  • a seat load detection device includes a seat seating portion.
  • a seat load detection device for detecting a seat load acting on a floor the first characteristic configuration of which is a fixed member fixed to the floor side, and a fixed side end that is one end side fixed to the fixed member.
  • a torsion bar having a horizontal torsion axis, and a load acting part that is fixed to the arm side end that is the other end of the torsion bar and is displaced from the torsion axis of the torsion bar.
  • An arm member and a torsional state measuring unit for measuring a torsional state of the torsion bar are provided, and the seat load is detected based on a measurement result of the torsional state measuring unit.
  • a fixing member fixed to the floor side which is the vehicle body side and an arm member fixed to the upper seat side of the vehicle, for example, of the torsion bar having the horizontal twist axis It is necessary to provide a horizontally extending bracket, etc. compared to a conventional seat load detection device that uses a flat plate-shaped strain plate that extends horizontally by being fixed to both ends. Therefore, it is possible to reduce the size and avoid problems such as interference with other devices added to the sheet.
  • the twisted state of the torsion bar changes approximately proportionally to the seat load as compared to the squeezed state of the strain generating plate in the conventional seat load detecting device.
  • the seat load can be accurately derived by a relatively simple calculation based on the twisted state of the torsion bar.
  • the ratio of the twisted state to the seat load can be set small to support a relatively wide range of seat loads. It can be made.
  • a second characteristic configuration of the seat load detection device according to the present invention is provided with a limiting unit that limits a displacement of the arm member about the torsional axis about a predetermined amount or more with respect to the fixing member.
  • a third characteristic configuration of the seat load detection device is that the fixing member and the arm member are configured by plate-like bodies facing each other in the horizontal direction.
  • the fixing member and the arm member are configured by the plate-like body that is opposed to each other in the horizontal direction, that is, has the torsional axis of the torsion bar as a normal direction.
  • the strength and rigidity of the torsion bar around the torsion axis of the torsion bar can be improved.
  • damage to each member due to overload and the like can be suppressed, and further, the detection accuracy of the seat load due to the stagnation of each member can be improved.
  • the decrease can be suppressed. Since the installation dimension in the thickness direction of the fixing member and the arm member can be made relatively small, further miniaturization is possible.
  • the torsional state measuring means is located at a position where the torsional axis force of the torsion bar is separated from the torsional axis of the arm member relative to the fixing member. It is composed of a displacement sensor that measures the displacement around the twisted state.
  • the displacement sensor that can be mounted relatively inexpensively and easily as the torsion state measuring means is provided.
  • the displacement of the arm member with respect to the fixing member can be accurately measured as the torsion state of the torsion bar, and the detection accuracy of the seat load can be further improved.
  • the arm member includes at least one of the torsion bar, the load acting unit, and the displacement sensor arranged at positions separated from each other.
  • a member region constituted by a member and connecting the load acting part and the torsion bar and a member region connecting the torsion bar and the displacement sensor transmit force between the two member regions. Is provided in a state of being separated by the torsion bar.
  • a sixth characteristic configuration of the seat load detection device is that the displacement sensor is provided at a position separated from the load acting portion with respect to the torsional axis of the torsion bar. .
  • the displacement of the arm member relative to the fixed member at a position separated from the load acting portion with respect to the torsional axis of the torsion bar is larger than the load acting portion, so that the displacement is shifted to that position.
  • the displacement sensor is configured to measure a direction perpendicular to a torsion axis of the torsion bar in each of the arm member and the fixing member. They are arranged so as to measure displacements in a pair of opposed surfaces facing each other in the linear direction.
  • the arm member and the fixing member are each formed of a pair of opposing surfaces that are opposed to each other with a direction perpendicular to the torsional axis as a normal direction. Since the distance between them hardly changes, the displacement sensor is arranged so as to measure the displacement on the opposite surface, so that the displacement of the arm member with respect to the fixed member due to torsion of the torsion bar is measured more accurately. be able to.
  • the displacement sensor is on a line passing through the torsion center of the torsion bar and perpendicular to the torsion axis! It is in the point arrange
  • the measured displacement is determined by the torsion bar.
  • the torsion of the torsion bar is almost completely affected by the sag due to the bending moment, and the displacement force can accurately detect the seat load.
  • a ninth characteristic configuration of the seat load detection device is the arm of the torsion bar.
  • a cylindrical member that is fixed at one end to a side end and surrounds a side surface of the torsion bar; and the arm member is fixed to the other end of the cylindrical member.
  • the distance between the fixing member and the arm member can be made shorter than the length of the torsion bar, and the installation dimension in the thickness direction of the fixing member and the arm member can be further reduced.
  • the arm member on which the seat load acts can be accurately displaced along the torsion bar center. For example, the displacement of the arm member around the torsional axis relative to the fixed member can be accurately measured as a torsion bar in a twisted state.
  • the load acting portion is arranged on a line that passes through the torsion center of the torsion bar and is perpendicular to the torsion axis.
  • the load acting portion is arranged on a line that passes through the torsion center of the torsion bar and is perpendicular to the torsion axis, thereby suppressing excessive stagnation of the torsion bar due to the seat load acting on the load acting portion.
  • it is possible to suppress damage due to the stagnation of the torsion bar, and it is possible to suppress a decrease in detection accuracy of the seat load due to the stagnation of the torsion bar.
  • the torsion bar has different cross-sectional shapes in which the second-order moments in a plurality of directions perpendicular to the torsional axis are mutually different. It consists of at least one element.
  • the torsion bar is provided with an element having a cross-sectional shape such as a cross shape, a polygonal shape, an elliptical shape, etc. having different cross-sectional second moments in a plurality of directions perpendicular to the torsion axis. 1 or a combination of two or more.
  • a cross-sectional shape such as a cross shape, a polygonal shape, an elliptical shape, etc. having different cross-sectional second moments in a plurality of directions perpendicular to the torsion axis. 1 or a combination of two or more.
  • a cover member is provided for each of the load acting portion and the torsional state measuring means, and the two cover members are flexible connecting members. It is in the point where it is connected. That is, since the two cover members respectively provided in the load acting portion and the torsional state measuring means are connected by the connecting member, the work efficiency is improved when the cover members are provided at these two locations. Moreover, since the connecting member is flexible, the two cover members can be attached without any inconvenience even when the distance between the load acting portion and the torsional state measuring means is slightly different for each seat load detecting device. Furthermore, by having the flexibility, it can be applied to various types of seat load detection devices in which the arrangement of the load application part and the torsional state measuring means is different, and dust and other foreign substances are difficult to enter. A seat load detection device can be obtained.
  • a thirteenth characteristic configuration of the seat load detection device according to the present invention is that a magnetic shielding member is provided on the cover member provided on the twist state measuring means.
  • the influence of the external magnetic field can be reduced by providing the magnetic shielding member on the cover member provided in the twist state measuring means, for example, the influence of the magnetic field such as a Hall element and a magnet can be reduced. It is possible to prevent the load detection accuracy from being lowered when the seat load detection device is configured using a sensor.
  • FIG. 1 shows a state in which a seat load detection device 30 is attached to a vehicle seat 10.
  • the seat 10 includes a seat cushion 10a as a seating portion and a seat back 10b. When seated, the weight of the seated person acts as a seat load on the seat cushion 10a.
  • the seat 10 is provided with seat load detecting devices 30 for detecting the seat load acting on the seat cushion 10a at four positions on the front, rear, left and right of the seat 10, and each seat load detecting device 30 detects the seat load.
  • the sum of the applied loads is detected as the seat load.
  • the sheet load detection device 30 is preferably arranged at four positions as described above in consideration of the stability of the seat 10 and the like, but the number and arrangement positions may be changed as appropriate.
  • a lower frame 13 is fixed to the floor side of the vehicle, and the lower frame 13 is The upper frame 12 is held in a slidable state.
  • the fixing bracket 31 (fixing member) of the seat load detection device 30 is fixed to the upper frame 12, while the arm bracket 32 (arm member) of the seat load detection device 30 is a cushion frame in the seat cushion 10a. It is fixed to 11.
  • the seat load detection device 30 disposed in front of the seat 10 and the seat load detection device 30 disposed in the rear of the seat 10 may adopt the same structure except that they are symmetrical in the front-rear direction. it can. Therefore, in the following description, the detailed structure of the seat load detection device 30 disposed behind the seat 10 will be described.
  • the seat load detection device 30 includes a fixing bracket 31 as a fixing member fixed to the floor side, and a fixed side end 34a which is one end side of the fixing bracket 31. And a torsion bar 34 having a horizontal twist axis X, and a seat fixed at an arm side end 34b which is the other end of the torsion bar 34 and displaced from the twist axis X of the torsion bar 34
  • An arm bracket 32 as an arm member having a load acting portion 38a on which a load acts, and a torsional state measuring means 50 for measuring the torsional state of the torsion bar 34, and based on the measurement result of the torsional state measuring means 50 It is configured to detect sheet load.
  • the seat load acts on the load acting portion 38a of the arm bracket 32
  • the torsion bar 34 is twisted according to the seat load. Therefore, the seat is based on the twist state measured by the twist state measuring means 50.
  • the load can be detected
  • a cushion frame 11 in the seat cushion 10 is rotatable on the arm bracket 32 by a load pin 38 screwed into a cylindrical limit pin 41 welded and fixed to the arm bracket 32. It is connected in a state, and the position force of the load pin 38 provided with the cushion frame 11 becomes the load acting portion 38a to which the seat load is applied.
  • the offset amount of the load acting portion 38a that is, the load pin 38 with respect to the torsion axis X of the torsion bar 34, the torsion strength of the torsion bar 34, and the like take into account the stability of the seat 10 and the measurement accuracy of the torsion state measuring means 50, etc. Set as appropriate.
  • the fixed bracket 31 extends upward along a vertical plane, and has an upper floor side.
  • the arm bracket 32 is fixed to the arm side end 34b of the torsion bar 34 in a state of extending sideways along the vertical plane.
  • the fixed bracket 31 and the arm bracket 32 are formed of plate-like bodies facing each other in the horizontal direction, so that the installation dimension in the thickness direction is relatively small, and further extends along the vertical plane. Easy mounting and shape for arm bracket 32 and upper frame 12.
  • a cylindrical member 36 having one end fixed to the arm side end 34b of the torsion bar 34 and surrounding the side surface of the torsion bar 34 is provided, and the arm bracket 32 is provided on the other end of the cylindrical member 36. It is fixed.
  • the distance force between the fixing bracket 31 and the arm bracket 32 is shorter than the length of the torsion bar 34, and the installation dimension in the thickness direction of the fixing bracket 31 and the arm bracket 32 is further reduced. Become.
  • the inner surface of the cylindrical member 36 and the side surface of the fixed side end 34a of the torsion bar 34 are arranged in a loosely fitted state, and the inner surface of the cylindrical member 36 and the fixed side end 34a of the torsion bar 34 are Excessive stagnation of the torsion bar 34 is suppressed by the contact with the side surface.
  • the inner surface of the cylindrical member 36 and the fixed side end 34a of the torsion bar 34 are each circular, it is easy to process them so that they fit together in a loosely fitted state.
  • the torsion bar 34 has a fixed-side end 34a and an arm-side end 34b formed with a relatively large diameter so as to suppress twisting due to the seat load, and a twist caused by the seat load occurs between them. Thus, it is configured as a twisted portion 34c formed with a smaller diameter than the end portions 34a, 34b.
  • the torsion bar 34 By providing the torsion bar 34 with a twisted portion 34c, it is possible to remove unstable factors such as a change in the twisted state of the torsion bar 34 due to welding when the torsion bar 34 is fixed to the fixed bracket 31 or the arm bracket 32.
  • the torsion bar 34 can be accurately and stably twisted with respect to the seat load.
  • the torsion part 34c of the torsion bar 34 is formed to have a cross-sectional shape that protrudes in the vertical direction and the horizontal direction. That is, the section of the torsion bar 34
  • the torsion bar 34 having such a cross-sectional shape has bending rigidity because the cross-sectional secondary moments in a plurality of directions perpendicular to the twist axis X are formed from elements having different cross-shaped cross-sectional shapes.
  • the torsion bar 34 can be twisted well for seat loads with relatively low torsional rigidity, but it is difficult to bend. The reduction in the strength of the torsion bar 34 can be suppressed by making the cross-sectional shape of the torsion bar 34 a cross shape.
  • the second moment of section along the direction of operation of the seat load that is, along the vertical direction is larger than the second moment of section along the direction intersecting with the direction of action. It becomes stagnation by the seat load.
  • the width in the vertical direction may be the same as the width in the horizontal direction. By making it larger than the width in the direction, the stagnation of the torsion bar 34 can be further suppressed.
  • the cross-sectional shape of the torsion bar 34c of the torsion bar 34 can adopt any shape such as a circle, an ellipse, and a rectangle in addition to the cross shape as described above.
  • a plurality of rod-like bodies arranged in the vertical direction or the like may be used, and the cross-sectional shape thereof may be a plurality of element part forces separated from each other.
  • the fixed-side end 34a and the arm-side end 34b of the torsion bar 34 are formed to have a relatively large diameter, the stress generated at each of the ends 34a, 34b can be reduced, and the fixed bracket 31ya. It is possible to suppress breakage of the fixing portion with respect to the arm bracket 32.
  • the fixed bracket 31 is formed with an opening 42 formed so as to surround the limiting pin 41 protruding from the arm bracket 32.
  • the limit pin 41 and the opening 42 are subjected to an excessive seat load on the load acting portion 38a, the outer surface of the limit pin 41 contacts the inner surface of the opening 42 and the arm bracket 32 is fixed to the fixed bracket 31.
  • it functions as a limiting means to limit excessive displacement around the twist axis X.
  • the torsional state measuring means 50 is configured such that the arm bracket 32 is deformed about the torsion axis X relative to the fixed bracket 31 at a position away from the torsion axis X of the torsion bar 34.
  • the displacement sensor 50a is configured to measure the position as a twisted state, and the displacement sensor 50a is opposed to and fixed to the magnet 52 fixed to the magnet mounting portion 53a provided on the arm bracket 32 side and the magnet 52.
  • the hall element 51 is fixed to a hall element mounting portion 53b provided on the bracket 31 side.
  • a magnet 52 may be provided on the fixed bracket 31 side
  • a hall element 51 may be provided on the arm bracket 32 side.
  • the magnetic flux density is measured as the displacement by the Hall element 51, and the seat load can be detected based on the displacement.
  • the magnet 52 is composed of a pair of magnets 52a and 52b spaced apart from each other by a predetermined amount along the displacement direction, that is, the vertical direction.
  • the other magnet 52b is fixed with the pole facing the hall element 51, and the other magnet 52b is fixed with the north pole facing the hall element 51.
  • the magnetic flux density distribution formed by the pair of magnets 52a and 52b arranged as described above is, for example, a direction in which the S pole or the N pole is directed toward the Hall element 51 or a direction perpendicular to the direction.
  • the magnetic flux density change with respect to the displacement is large, so the Hall element 51 measures the displacement as a magnetic flux density change stably and satisfactorily. can do.
  • the spacing between the pair of magnets 52a, 52b and the spacing between the magnets 52a, 52b and the Hall element 51 are set as appropriate so that the above displacement can be detected well as the magnetic flux density.
  • the pair of magnets 52a, 52b The distance between 52b and 52b is set to about 1.5mm to 2mm, so that the straightness of the magnetic field lines can be improved, and the distance between the magnet 52a, 52b and the Hall element 51 is set to about 2mm.
  • the Hall element 51 can measure the displacement as a change in magnetic flux density.
  • each of the magnet 52 and the hall element 51 of the displacement sensor 50a is connected to the torsion bar 34.
  • the arm bracket 32 and the fixed bracket 31 also extend in a direction perpendicular to the torsion axis X so that they face each other.
  • the direction perpendicular to the torsion axis X is the normal direction. It is fixed to the bracket.
  • the displacement sensor 50a measures the displacement at a pair of opposed surfaces facing each other with the direction perpendicular to the torsion axis X of the torsion bar 34 as the normal direction in each of the arm bracket 32 and the fixed bracket 31.
  • the distance between the magnet 52 and the Hall element 51 is prevented from changing due to, for example, twisting of the arm bracket 32.
  • the displacement sensor 50a is arranged to measure the displacement of the arm bracket 32 with respect to the fixed bracket 31 on a line passing through the torsion center XO of the torsion bar 34 and perpendicular to the torsion axis.
  • the load acting part 38a is also arranged on a line that passes through the torsion center XO of the torsion bar 34 and is perpendicular to the torsion axis X, so that the torsion bar 34 by the seat load acting on the load acting part 38a It is possible to suppress the stagnation and further the displacement at the measurement position of the displacement sensor 50a due to the stagnation.
  • the cover member 60 can be provided on at least one of the load acting portion 38a and the torsional state measuring means 50.
  • the cover member 60 shown in FIGS. 2 to 4 is configured to integrally cover both the load acting portion 38a and the torsional state measuring means 50.
  • the cover member 60 is appropriately provided with a notch 60 a for avoiding interference with the cushion frame 11 and the fixing bracket 31 according to the mounting position of the cover member 60.
  • the cover member 60 is fixed by, for example, configuring the cover member 60 with an elastic member and fixing brackets. 31 is carried out by the inertia of the cover member 60. Alternatively, the fixing bracket 31 may be fastened together with the mounting hole.
  • the cover member 60 can be provided with a magnetic shielding member 70 such as a metal plate.
  • the magnetic shielding member 70 can be provided by press-fitting, fitting, or insert molding into the inner wall of the cover member 60. With the cover member 60 having the magnetic shielding member 70, it is possible to prevent dust and other foreign substances from entering the displacement sensor 50a and at the same time reduce the influence of the external magnetic field applied to the Hall element 51 in particular. A decrease in accuracy can be prevented.
  • one end side of the cylindrical member 36 is fixed to the arm side end 34b of the torsion bar 34, and the other end side of the cylindrical member 36 is fixed to the arm bracket 32.
  • one end side of the cylindrical member 36 may be fixed to the fixed side end portion 34a of the torsion bar 34, and the other end side of the cylindrical member 36 may be fixed to the fixing bracket 31.
  • the load pin 38 is provided on the side from which the torsion bar 34 and the cylindrical member 36 protrude, and the position of the load application point 38a passes through the torsion center X0 of the torsion bar 34 and is perpendicular to the torsion axis X. As shown in Figs. 5 and 6, the load pin 38 is provided on the side opposite to the side from which the torsion bar 34 and the cylindrical member 36 protrude, and the load acting point 38a is set to the torsion axis 34 of the torsion bar 34. A position different from the torsion center X0 may be used.
  • the cylindrical member 36 is provided.
  • the torsion bar 34 without the cylindrical member 36 is directly provided.
  • the arm bracket 32 may be fixed.
  • the arm bracket 32 is formed in a rectangular shape so as to approach the fixed bracket 31, so that the installation dimension in the thickness direction of the fixed bracket 31 and the arm bracket 32 is reduced.
  • the arm bracket 32 as an arm member is formed as a single member disposed at a position in which the torsion bar 34, the load acting portion 38a, and the displacement sensor 50a are separated from each other in this order from one end side in the longitudinal direction.
  • the arm bracket 32 as the force arm member is configured by at least one member in which the torsion bar 34, the load acting part 38a, and the displacement sensor 50a are arranged at positions spaced apart from each other, and the torsion bar
  • the force transmission between the two member regions is divided by the torsion bar 34 between the member region connecting 34 and the load acting portion 38a and the member region connecting the torsion bar 34 and the displacement sensor 50a. You can make it in a state!
  • the arm bracket 32 is fixed to a position where the load acting portion 38a, the torsion bar 34, and the displacement sensor 50a are separated from each other in this order from one end side in the longitudinal direction.
  • a first member region 32a that connects the load application portion 38a and the torsion bar 34, and a second member region that connects the torsion bar 34 and the displacement sensor 50a are provided in the arm bracket 32.
  • a torsion bar 34 is fixed between 32b.
  • the two member regions of the first member region 32a and the second member region 32b are made different regions in one member, and the force transmission between the two member regions is divided by the torsion bar 34. ! RU
  • the first member region 32a itself is deformed if it is twisted by the seat load. Even if it occurs, the second member region 32a can be prevented from being affected, and the displacement due to torsion of the torsion bar 34 can be accurately measured by the displacement sensor 50a.
  • the arm bracket 32 has a first arm bracket 32c having one end fixed to the load acting portion 38a and the other end fixed to the torsion bar 34, and one end Is fixed to the torsion bar 34 and the other end is fixed to the displacement sensor 50a.
  • the second bracket 32d is also composed of two members, and the first arm bracket 32c as a member region connecting the torsion bar 34 and the load acting portion 38a, and the member region connecting the torsion bar 34 and the displacement sensor 50a. One end of the second arm bracket 32d is fixed to the torsion bar.
  • the two member areas are composed of two members, the first arm bracket 32c and the second arm bracket 32d, which are separate from each other, and transmission of force between the two member areas is performed by the torsion bar 34. Configured to sever! RU
  • first arm bracket 32c and the second arm bracket 32d are separate bodies, as shown in FIGS. 7 and 8, the two member regions of the first member region 32a and the second member region 32b are combined into one.
  • the second arm bracket 32d can be reliably prevented from being affected by torsion and deformation of the first arm bracket 32c itself, as compared with a different region of the member.
  • the load acting portion 38a, the torsion bar 34, and the displacement sensor 50a are arranged in a state of being aligned on the same line along the horizontal direction.
  • the placement positions of the heavy action portion 38a, the torsion bar 34, and the displacement sensor 50a can be changed as appropriate.
  • the load action portion 38a and the torsion bar 34 are arranged in a line on the same line along the horizontal direction.
  • the displacement sensor can also be arranged in a line on the same line along the vertical direction.
  • the cover member 60 can be provided on at least one of the load acting portion 38a and the torsional state measuring means 50.
  • Figures 7 and 8 show the load acting part 3
  • the cover member 60 which covers 8a and the twist state measuring means 50 separately is shown.
  • 7 and 8 show an example in which the magnetic shielding member 70 is provided on the cover member 60 that covers the torsion state measuring means 50.
  • the cover member 60 of FIGS. 7 and 8 is connected by a flexible connecting member 60b.
  • a connection member 60b When the cover member 60 connected by such a connection member 60b is used, the working efficiency is improved when the cover member 60 is provided at two places, that is, the load acting portion 38a and the twist state measuring means 50.
  • the connecting member 60b since the connecting member 60b has flexibility, even if the distance between the load acting portion 38a and the torsional state measuring means 50 is slightly different for each seat load detecting device 30, the two cover members 60 can be connected without inconvenience. Can be attached.
  • it can be applied to various variations of the seat load detecting device 30 in which the arrangement of the load acting portion 38a and the torsional state measuring means 50 is different, and dust and other foreign matters enter. It is possible to obtain a seat load detection device 30 that is difficult to insert.
  • the connecting member 60b is provided so as to cover the region between the load acting portion 38a and the torsional state measuring means 50, for example, foreign matter can be prevented from adhering to the torsion bar 34 from above.
  • the seat load detecting device 30 with higher reliability can be obtained.
  • the cover member 60 covering the twisted state measuring means 50 may be configured to mainly block only the gap between the hall element 51 and the magnet 52 from external force.
  • a dust boot made of a flexible member such as rubber can be provided from the magnet mounting portion 53a to the Hall element mounting portion 53b.
  • FIG. 9 and 10 also show a cover member 60 that integrally covers both the load acting portion 38a and the torsional state measuring means 50.
  • FIG. 9 and 10 also show a cover member 60 that integrally covers both the load acting portion 38a and the torsional state measuring means 50.
  • the magnet 52 and the hall element 51 may be arranged so as to face each other in a direction parallel to the twist axis X of the torsion bar 34.
  • the torsional state measuring means 50 is constituted by the displacement sensor 50a.
  • the torsional state measuring means 50 is attached to the side surface of the torsion bar 34 and the distortion state of the side surface of the torsion bar 34 is defined as the twisted state.
  • You may comprise with the strain gauge to measure. That is, the torsion bar torsion changes approximately proportionally to the seat load rather than the distortion of the strain generating plate in the conventional seat load detecting device. Therefore, the strain gauge is used as the torsion state measuring means.
  • a circuit for the strain gauge can be provided on the surface of the cylindrical member 36.
  • the present invention can be applied to various seat load detection devices that detect a seat load acting on a seat of a seat for a vehicle or the like.
  • FIG. 1 is a diagram showing a state in which a seat load detection device is attached to a vehicle seat.
  • FIG.2 Perspective view of seat load detection device
  • FIG. 3 Plan view of the seat load detection device shown in Fig. 2
  • FIG. 5 is a perspective view of another embodiment of the seat load detection device.
  • FIG. 6 is a plan view of the seat load detection device shown in FIG.
  • FIG. 7 is a perspective view of another embodiment of the seat load detection device.
  • FIG. 8 Plan view of the seat load detection device shown in Fig. 7
  • FIG. 9 is a perspective view of another embodiment of the seat load detection device.
  • FIG. 10 is a plan view of the seat load detection device shown in FIG.

Abstract

Dispositif de détection de charge de siège destiné à détecter une charge s’exerçant sur une partie d’assise de siège de véhicule etc., ledit dispositif de détection de charge de siège pouvant être de relativement petite taille et ayant une excellente précision de détection. Ledit dispositif de détection de charge de siège a un élément de fixation (31) fixé au côté de plancher ; une barre de torsion (34) reliée, au niveau de la section d’extrémité (34a) du côté de fixation correspondant au côté d’extrémité de la barre de torsion (34), à l’élément de fixation (31) et ayant un axe de torsion horizontal (X) ; un élément de bras (32) relié, au niveau de la section d’extrémité du côté de bras (34b) correspondant à l’autre côté d’extrémité de la barre de torsion (34) et ayant une section d’exercice de charge (38a) sur laquelle une charge de siège s’exerce, à une position déplacée de l’axe de torsion (X) de la barre de torsion (34) ; et des moyens de mesure de niveau de torsion (50) destinés à mesurer le niveau de torsion de la barre de torsion (34). La charge du siège est détectée sur la base du résultat de la mesure réalisée par les moyens de mesure de niveau de torsion (50).
PCT/JP2005/011538 2004-09-28 2005-06-23 Dispositif de détection de charge de siège WO2006035533A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2004281906 2004-09-28
JP2004-281906 2004-09-28
JP2004372140A JP3797376B2 (ja) 2004-05-26 2004-12-22 シート荷重検出装置
JP2004-372140 2004-12-22

Publications (1)

Publication Number Publication Date
WO2006035533A1 true WO2006035533A1 (fr) 2006-04-06

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ID=36118685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/011538 WO2006035533A1 (fr) 2004-09-28 2005-06-23 Dispositif de détection de charge de siège

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WO (1) WO2006035533A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6499360B1 (en) * 2001-05-22 2002-12-31 Gagetek Technologies Holdings Company Torsional sensing load cell with overload protection
JP2003220873A (ja) * 2001-11-22 2003-08-05 Nippon Soken Inc 乗員検知システム
JP2004347577A (ja) * 2003-05-21 2004-12-09 Delta Tooling Co Ltd 座席構造及び荷重検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6499360B1 (en) * 2001-05-22 2002-12-31 Gagetek Technologies Holdings Company Torsional sensing load cell with overload protection
JP2003220873A (ja) * 2001-11-22 2003-08-05 Nippon Soken Inc 乗員検知システム
JP2004347577A (ja) * 2003-05-21 2004-12-09 Delta Tooling Co Ltd 座席構造及び荷重検出装置

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