JP2014201082A - Seat belt device with heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device with a heater improving quality by a simple structure.SOLUTION: A heater belt 100 is equipped with a band-shaped webbing 102 for restraining an occupant; a retractor 114 installed on a vehicle and winding up and storing the webbing 102 fron one end side; a lap anchor 108 for fixing the other end of the webbing 102 to a part near a side portion of a vehicle seat; a tongue plate 106 installed movably on the webbing 102, and detachably attached to a buckle 118 installed a part near a side portion on the opposite side to the lap anchor 108 of the vehicle seat; a sheet-shaped planar heater 122 attached along a waist belt 102b, and generating heat by electricity; a predetermined protection case 134 installed near the lap anchor 108 of the webbing 102; and a control circuit substrate 128 installed in the protection case 134, and controlling supply power to the planar heater 122.

Description

  The present invention relates to a seat belt device with a heater that not only restrains an occupant to a seat but also has a heating function.

  Almost all current passenger cars have a seat belt device in the seat. The seat belt device is a safety device that restrains the occupant to the seat with belt-shaped webbing, and prevents the occupant from jumping forward due to inertial force when a large deceleration is applied to the vehicle due to a sudden stop or collision. Yes. In general, the three-point seat belt device, which is widely spread, inserts a tongue plate provided on the webbing into the buckle next to the seat, so that the area from the shoulder of the occupant to the waist and the area from both sides of the waist It becomes the structure which restrains.

  In recent years, a type of seat belt device that has various additional functions such as a heater function for warming an occupant has been developed in addition to an occupant restraint function. For example, in the seat belt device of Patent Document 1, a portion that generates heat called a temperature adjustment unit is provided in the webbing. The temperature control unit is embedded with a heating member such as a heating wire, and functions as heating or the like, thereby enhancing the comfort of the passenger.

JP 2008-37326 A

  At present, there is a demand for development of a seat belt device with a heater having a simpler configuration. For example, a seat belt device with a heater requires a control unit that controls the temperature of the heater. This control unit has been conventionally installed on the vehicle side, but there is room for further simplification of the configuration including the installation location. In addition, from the viewpoint of noise reduction, it has been desired to place the control unit in a place away from other electronic devices.

  In view of such problems, an object of the present invention is to provide a heater-equipped seat belt device that is improved in quality with a simple configuration.

  In order to solve the above-described problems, a typical configuration of a seatbelt device with a heater according to the present invention includes a belt-like webbing that restrains an occupant and a retractor that is installed in a vehicle and winds and stores the webbing from one end side thereof. And a wrap anchor that fixes the other end of the webbing near the side of the vehicle seat, and a detachable installation on the webbing that can be attached to and detached from the buckle installed near the side of the vehicle seat opposite to the lap anchor Near the lap anchor of the webbing, and a sheet heater that is heated in the form of a sheet and is installed along the area of the webbing that restrains the occupant's waist between the lap anchor and the tongue plate. A predetermined protective case to be installed, and a control circuit board that is installed in the protective case and controls the power supplied to the planar heater. The features.

  In the above configuration, the heater belt control unit is conventionally installed together with other ECUs (Electronic Control Units). Therefore, a protective case including a control circuit board (hereinafter collectively referred to as a control unit) is used as a lap anchor on the webbing. It is installed in the vicinity. Therefore, in addition to a simple configuration as a whole, the control unit is separated from other electronic devices, so that noise can be reduced in the control operation. Furthermore, since the control unit is installed on the webbing, particularly in the vicinity of the lap anchor, the retracting webbing winding operation is not subjected to a load due to the weight of the control unit, and the operation quality of the retractor can be maintained.

  Said protective case is good to be installed in the position lower than the seat surface in the seat cushion of a vehicle seat. At this position, since the control unit such as the protective case is not noticeable, the aesthetics in the vehicle can be maintained.

  One or more cables that are wired on the webbing and electrically connect the control circuit board to the planar heater or the vehicle-side power supply, and on the webbing with a wiring path provided with at least one corner And a cable holding means for holding the cable on the webbing. Since this cable is wired with corners, even if it is pulled together during webbing winding or withdrawing compared to the case of linear wiring, the tensile load is dispersed and damage occurs. Can be prevented.

  At least two or more corners of the wiring path may be provided for one cable. The cable holding means may include a sewing portion that is looped from the webbing to the cable at a corner of the cable wiring path. With these configurations, the tensile load that can be applied to the cable can be efficiently dispersed.

  The above protective case covers at least the webbing with the cable wired on the webbing, and the cable holding means protrudes toward the webbing from the inside of the protective case and interferes with the cable at the corner of the cable wiring path. May be included. This rib can also hold the cable wiring path.

  Two or more ribs may be provided for one cable. By arranging the cable so as to extend over two or more ribs, it is possible to efficiently disperse the tensile load that can be applied to the cable.

  The protective case includes a webbing covering portion that covers the periphery of the webbing, a substrate installation portion that is provided over the webbing coating portion and to which the control circuit board is attached, and a wall portion that partitions the webbing coating portion and the substrate installation portion. And a wiring hole for passing a cable provided on the wall and extending from the control circuit board to the webbing. By such a protective case, a control unit having a simpler configuration can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the seatbelt apparatus with a heater by which the improvement of quality was achieved with the simple structure.

It is the figure which illustrated the outline | summary of the seatbelt apparatus with a heater concerning this invention. It is the figure which illustrated the heater assay of FIG. 1 independently. It is the figure which illustrated the detail of the control unit of FIG. It is the figure which illustrated schematically the wiring path | route of the wire harness and lead wire of Fig.3 (a). It is the figure which illustrated schematically the further structure of the seatbelt with a heater concerning this invention. It is the figure which illustrated the control unit of FIG. 1 from another direction. It is the figure which illustrated the modification of the wiring path | route of the lead wire of FIG.4 (b). It is the figure which illustrated the further modification of the wiring path | route of each cable. It is the figure which illustrated the modification of schematic structure of the said seatbelt with a heater illustrated in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating an outline of a seat belt device with a heater according to the present invention. FIG. 1 illustrates the right front seat of the vehicle as viewed from the front right side of the vehicle. The seat belt device with a heater (hereinafter referred to as a heater belt 100) is a three-point type that is widely used as a general seat belt for a driver's seat, and includes a belt-like webbing 102 and a through anchor 104 and a tongue plate. 106 and the lap anchor 108 are supported at three points to restrain the occupant 110.

  One end side of the webbing 102 is wound and accommodated in a retractor 114 installed near the floor next to the seat 112. The webbing 102 extending from the retractor 114 is fixed by a lap anchor 108 near the side portion of the seat cushion 116 of the seat 112 through a through anchor 104 provided on a wall portion in the vehicle interior.

  A tongue plate 106 is movably installed in the middle of the webbing 102. When the heater belt 100 is mounted, the tongue plate 106 is installed near the side of the vehicle seat opposite to the lap anchor 108. Insert into the buckle 118. At this time, the webbing 102 is divided into a shoulder belt 102a that extends from the shoulder to the waist of the occupant 110 and a waist belt 102b that extends to both sides of the waist with the tongue plate 106 as a boundary. to bound.

  The heater belt 100 has a heating function in addition to the original function as a safety device for restraining the occupant 110. In the present embodiment, a heater assay 120 is provided on the waist belt 102b. The heater assay 120 is composed of members centering on a planar heater 122 (see FIG. 2) as a heater that generates heat by electricity.

  FIG. 2 is a diagram illustrating the heater assay 120 of FIG. 1 alone. As illustrated in FIG. 2A, in the heater belt 100, the control unit 124 of the heater assay 120 that is conventionally provided on the vehicle side is provided at the end of the lap anchor 108 side on the webbing 102. Compared with the conventional heater belt, the overall configuration is simple.

  FIG. 2 (b) is an exploded view of the heater assay 120 of FIG. First, the heater assay 120 is provided with a planar heater 122 as a heating element. The planar heater 122 is a long sheet, is thin and flexible, and is attached along the occupant side surface (the lower surface in FIG. 2) of the waist belt 102b of the webbing 102. The planar heater 122 is connected to the control circuit board 128 of the control unit 124 by two lead wires 126a and 126b, and receives electric power and predetermined control. The planar heater 122 may be a planar structure having exothermic properties. For example, a so-called carbon heater using a resistance heating element or carbon fiber, or an aluminum foil heater may be used.

  An insulating protection member 130 is provided on the passenger side of the planar heater 122 so that the planar heater 122 does not directly touch the body of the passenger 110. The insulating protection member 130 is a cover member made of an insulating fiber material or foam material, and is installed on the webbing 102 by sewing, bonding, or welding. By providing the insulating protective member 130, safety is enhanced and the touch of the webbing 102 is improved, so that the usability of the heater belt 100 is enhanced.

  In the present embodiment, the temperature of the heater assay 120 is measured, and the temperature is automatically controlled by feeding it back to the control operation. Therefore, as illustrated in FIG. 1, the heater assay 120 includes a thermistor 132 as an example of a temperature detection element for detecting the heat generation temperature of the planar heater 122. The thermistor 132 is thin, and is attached to the passenger side of the insulating protective member 130 that covers the planar heater 122.

  The thermistor 132 is provided in a region where at least the body temperature of the occupant 110 is transmitted within the range of the planar heater 122. For example, a region in contact with the lower abdomen or a region extending from the side of the pelvis to the buttocks. This is a configuration for controlling the temperature of the planar heater 122 in consideration of the body temperature transmitted from the occupant 110 in view of the fact that the sensible temperature of the occupant 110 is likely to increase due to the webbing 102 being in close contact with the occupant 110. is there.

  As illustrated in FIG. 2B, the control unit 124 includes a protective case 134 and a control circuit board 128 installed in the protective case 134. The protective case 134 is a thin exterior made of resin or the like, and can be divided into an upper case 134a and a lower case 134b. The protective case 134 is attached near the lap anchor 108 of the webbing 102 with the webbing 102 interposed therebetween.

  The control circuit board 128 is a circuit board having a function of controlling power supplied to the planar heater 122, and includes a large number of electronic components such as a CPU. The control circuit board 128 is installed in the protective case 134, particularly in the upper case 134a. The control circuit board 128 includes lead wires 126a and 126b connected to the planar heater 122, and wire harnesses 136a and 136b connected to a power source (battery) on the vehicle side. Connectors 138a and 138b are provided at the ends of the wire harnesses 136a and 136b, respectively, and are connected to a vehicle-side terminal to receive power from a power source. In the following description, the lead wires 126a and 126b and the wire harnesses 138a and 138b are collectively referred to as “cables”.

  FIG. 3 is a diagram illustrating details of the control unit 124 of FIG. FIG. 3A is a diagram illustrating the inside of the upper case 134a in FIG. Inside the upper case 134a, a pocket-shaped substrate installation part 140 is provided for installing the control circuit board 128. The board installation part 140 is provided with a wiring hole 144 through which the lead wires 126a and 126b connected to the control circuit board 128 pass along with the insertion opening 142 when the control circuit board 128 is inserted.

  FIG.3 (b) is AA sectional drawing of Fig.2 (a). As illustrated in FIG. 3B, when the upper case 134 a and the lower case 134 b are assembled, a webbing covering portion 146 is formed below the substrate setting portion 140. The webbing covering portion 146 covers the periphery of the webbing 102 together with each cable. At this time, the lower part of the substrate installation part 140 described above functions as a wall part 148 that partitions the webbing covering part 146 and the substrate installation part 140.

  In the present embodiment, the lead wires 126a and 120b and the wire harnesses 136a and 136b illustrated in FIG. 2B are wired on the webbing 102 and connected to various places. Although a simple wiring structure can be realized by wiring these cables on the webbing 102, a tensile load may be applied to the cable when the webbing 102 is pulled out or wound. Therefore, in the heater belt 100, measures are taken to protect the cable from the tensile load.

  Reference is again made to FIG. First, the wiring paths of the wire harnesses 136a and 136b are not linear, and are configured to extend while detouring by providing corners at several places. In order to realize this wiring path, a plurality of ribs 150a to 150f are provided inside the upper case 134a as cable holding means for holding the wiring paths of the wire harnesses 136a and 136b. Three ribs 150a to 150f, for example, three for one wire harness, such as ribs 150a to 150c for the wire harness 136a, are provided. The ribs 150 a to 150 f are provided so as to protrude toward the webbing 102, and the wire harnesses 136 a and 136 b are placed on the webbing 102 by wiring the wire harnesses 136 a and 136 b over the ribs 150 a to 150 f. It is wired to bend and extend several times.

  FIG. 4 is a diagram schematically illustrating the wiring paths of the wire harnesses 136a and 136b and the lead wires 126a and 126b of FIG. 4A schematically illustrates wiring paths such as the wire harnesses 136a and 136b on the webbing 102. FIG. As illustrated in FIG. 4A, for example, in the wire harness 136a, four corners C1 to C4 are formed and wired by being hooked on the ribs 150a to 150c (see FIG. 3A). In the wire harnesses 136a and 136b wired through such a wiring route, the ribs 150a to 150f interfere with each other at the corners, so that the tensile load is dispersed compared to the case where the wires are wired linearly. Therefore, the wire harnesses 136a and 136b can avoid the concentration of the load particularly on the root portion, and can prevent the occurrence of damage such as disconnection.

  Further, cable holding means having the same effect as each rib for the wire harness 136a is also applied to the lead wires 126a and 136b. FIG. 4B is an enlarged perspective view of the lead wire of FIG. As illustrated in FIG. 4B, for example, the lead wire 126a is also wired by a wiring path provided with four corners D1 to D4. At each corner of the lead wires 126a and 126b, the lead wires 126a and 126b are held by a sewing portion 152 formed by looping a predetermined string or the like from the webbing 102 in a loop shape. Therefore, the lead wires 126a and 126b are also not linear but take a wiring route that bends and extends several times, and even if a tensile load is applied, the load can be distributed, and thereby to the root portion or the like. It is possible to avoid the concentration of load.

  Below, operation | movement of the heater belt 100 is demonstrated. FIG. 5 is a diagram schematically illustrating a further configuration of the seat belt with a heater according to the present invention. As illustrated in FIG. 5, the control circuit board 128 controls power supplied to the planar heater 122 by various electronic components centered on the CPU 154. First, when the ignition switch 153 of the vehicle is turned on, the power from the battery 158 can be supplied to the heater belt 100 via the relay 156. Then, when the switch 160 of the heater belt 100 is turned on, the operation of the planar heater 122 starts. The control circuit board 128 is also provided with a fuse 162 for preventing overcurrent as a safety measure.

  In the present embodiment, the surface temperature of the heater belt 100 detected by the thermistor 132 is fed back to the temperature control of the planar heater 122. The CPU 154 transmits an operation signal such as an ON / OFF operation to the switching element 164 according to the measured value of the surface temperature of the heater belt 100 obtained from the thermistor 132. In response to this operation signal, the switching element 164 controls the amount of power supplied from the battery 158 to the planar heater 122. In this way, the heater belt 100 can perform temperature control with high comfort.

  Further advantages of the heater belt 100 will be described. In the conventional heater belt 100, the control unit is installed together with another ECU (Electronic Control Unit). In this embodiment, as illustrated in FIG. 1, the control unit 124 is installed in the vicinity of the lap anchor 108 on the webbing 102. doing. Also in this respect, the heater belt 100 has an advantage.

  FIG. 6 is a diagram illustrating the control unit 124 of FIG. 1 from another direction. FIG. 6A illustrates the control unit 124 of FIG. 1 in an enlarged manner when viewed from the front of the vehicle. As illustrated in FIG. 6A, the lap anchor 108 at the end of the webbing 102 is connected to an anchor bracket 168 provided on the floor 166 near the side of the seat 112. Therefore, the control unit 124 is also arranged near the floor adjacent to the lap anchor 108. In this position, for example, the weight of the control unit 124 becomes a burden on the winding operation of the webbing 102 of the retractor 114 (see FIG. 1), compared to the case where the control unit 124 is provided in the middle of the webbing 102 or the like. Absent. Although the weight of the control unit 124 is sufficiently light, not burdening the retractor 114 is very beneficial for maintaining the operation quality of the retractor 114.

  FIG. 6B is a diagram in which the range of illustration is expanded by reducing FIG. As illustrated in FIG. 6B, the control unit 124 is installed at a position lower than the seating surface 170 in the seat cushion 116 of the seat 112. At this position, the control unit 124 including the protective case 134 and the like is not visible. Therefore, the aesthetics in the vehicle can be maintained. Further, since the installation position of the control unit 124 is on the webbing 102 and is separated from other electronic devices, it is possible to reduce noise in the operation process described with reference to FIG.

(Modification)
Hereinafter, modifications of the components of the heater belt 100 described above will be described. FIG. 7 is a diagram illustrating a modification of the wiring path of the lead wires 126a and 126b in FIG. FIG. 7A illustrates a first modification of the wiring route, and FIG. 7B illustrates a second modification of the wiring route. For example, as illustrated in FIG. 7A, it is possible to provide a larger number of sewing parts 152, thereby providing corners E1 to E6 at six locations as illustrated in the lead wire 126a. It is also possible to perform wiring through a wiring path that meanders while bending 126a and 126b. Moreover, as illustrated in FIG. 7B, the configuration in which the sewing portions 152 are provided at the four corners F1 to F4 is different from that of FIG. A wiring path having a shape can be formed on the lead wires 126a and 126b.

  FIG. 8 is a diagram illustrating a further modification of the wiring path of each cable. FIG. 8A is a third modification of the wiring path of the lead wires 126a and 126b in FIG. In FIG. 8A, two sewing parts 152 are provided for one lead wire 126a, thereby providing corners G1 and G2 at two locations. As described above, the lead wires 126a and 126b are provided with at least two corners, so that the lead wires 126a and 126b can be wired along the longitudinal direction of the webbing 102 as a whole while being partially bent, and the tensile load is dispersed. It becomes possible to avoid the concentration of the load on the root.

  FIG. 8B is a modification of the wiring path of the wire harnesses 136a and 136b in FIG. Four ribs 210a to 210d are provided inside the upper case 134a of FIG. The wire harness 136a is hung on the ribs 210a and 210b, and the wire harness 136b is hung on the ribs 210c and 210d and wired. Thereby, for example, two corners H1 and H2 are formed for one wire harness 136a, and each wire harness is wired by an S-shaped wiring path. In this way, by providing at least two ribs for each wire harness, the wire harness is partially bent while being wired in one direction as a whole, and the tensile load that can be applied to each wire harness is reduced. It becomes possible to disperse.

  FIG. 9 is a diagram illustrating a modified example of the schematic configuration of the heater seat belt illustrated in FIG. 5. The feedback control of the temperature of the heater belt 100 illustrated in FIG. 5 can be omitted. In the case of such a specification, for example, the thermistor 132 (see FIG. 1) on the webbing 102 in FIG. 5 and the CPU 154 and the switching element 164 on the control circuit board 128 are omitted, and a simple configuration as illustrated in FIG. The control circuit board 200 can be realized. Although the control circuit board 200 has elements different from the control circuit board 128 such as the resistor 202, the use of the control circuit board 200 can provide a heater belt that is simpler and less expensive than the control circuit board 128. It becomes possible.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented by various methods. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  For example, the number of corners and the direction of bending in the wiring paths of the wire harnesses 136a and 136b and the lead wires 126a and 126b illustrated in FIG. 4 and the like are merely examples, and are not limited thereto. Although the above-described dispersion effect of the tensile load is improved by providing a plurality of corners, it can be obtained if there are at least one corner.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a seat belt device with a heater that not only restrains an occupant to a seat but also has a heating function.

DESCRIPTION OF SYMBOLS 100 ... Heater belt, 102 ... Webbing, 102a ... Shoulder belt, 102b ... Waist belt, 104 ... Through anchor, 106 ... Tung plate, 108 ... Lap anchor, 110 ... Passenger, 112 ... Seat, 114 ... Retractor, 116 ... Seat cushion , 118 ... Buckle, 120 ... Heater assay, 122 ... Planar heater, 124 ... Control unit, 126a, 126b ... Lead wire, 128 ... Control circuit board, 130 ... Insulating protective member, 132 ... Thermistor, 134 ... Protective case, 134a ... upper case of protective case, 134b ... lower case of protective case, 136a, 136b ... wire harness, 138a, 134b ... connector, 140 ... board installation part, 142 ... insertion port 144 ... wiring hole, 146 ... webbing covering part 148 ... wall part, 1 0a to 150f ... rib, 152 ... sewing part, 153 ... ignition switch, 156 ... relay, 158 ... battery, 160 ... switch, 162 ... fuse, 164 ... switching element, 166 ... floor, 168 ... anchor bracket, 170 ... seat cushion , 200... Control circuit boards of modified examples, 210a to 210d... Ribs of modified examples, C1 to C4... Corners of wiring paths of wire harnesses, D1 to D4. Corners in the first modified example of the lead wire wiring path, F1 to F4 ... Corners in the second modified example of the lead wire wiring path, G1 and G2 ... Corners in the third modified example of the lead wire wiring path, H1 and H2 ... Corner in a variation of the wiring path of the wire harness

Claims (8)

A belt-like webbing that restrains the passenger,
A retractor installed on a vehicle to wind up and store the webbing from one end thereof;
A lap anchor for fixing the other end of the webbing near the side of the vehicle seat;
A tongue plate movably installed on the webbing and detachable from a buckle installed near the side of the vehicle seat opposite to the lap anchor;
A sheet heater that is sheet-like and generates heat by electricity, and is attached along a range of the webbing that restrains the occupant's waist between the lap anchor and the tongue plate;
A predetermined protective case installed near the lap anchor of the webbing;
A control circuit board that is installed in the protective case and controls power supplied to the planar heater;
A seatbelt device with a heater.   The seat belt device with a heater according to claim 1, wherein the protective case is installed at a position lower than a seating surface of a seat cushion of the vehicle seat. One or more cables that are wired on the webbing and electrically connect the control circuit board and the planar heater or the vehicle-side power source, and the wiring path includes at least one or more corners. A cable wired on the webbing;
Cable holding means for holding the cable on the webbing;
The heater-equipped seat belt device according to claim 1, further comprising:   The seat belt device with a heater according to claim 3, wherein at least two corners of the wiring path are provided for one cable.   The seat belt device with a heater according to claim 3 or 4, wherein the cable holding means includes a sewing portion that is looped from the webbing to the cable at a corner of a wiring route of the cable. The protective case covers at least the webbing together with the cables wired on the webbing,
The cable holding means includes a rib that protrudes from the inside of the protective case toward the webbing and interferes with the cable at a corner of the wiring path of the cable. The seat belt device with a heater according to the item.   The seat belt device with a heater according to claim 6, wherein at least two ribs are provided for one cable. The protective case is
A webbing coating covering the periphery of the webbing;
A board installation part that is provided over the webbing coating part and to which the control circuit board is attached;
A wall section that divides the webbing covering section and the substrate installation section;
A wiring hole for passing a cable provided on the wall and extending from the control circuit board onto the webbing;
The seat belt device with a heater according to any one of claims 3 to 7, wherein the seat belt device with a heater is provided.

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