JP2004210161A - Vehicular slide seat with position sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the degradation of sensor performance and the generation of damage or the like by an external factor while reducing the number of parts, and to obtain high positional accuracy in mounting, and high sensor performance and reduction in size and weight by reducing a clearance. <P>SOLUTION: A magnet piece 2a is bonded and fixed to the bottom inner surface of a front-side area or rear-side area over the longitudinal direction of a lower rail 1b. A magnetic detection sensor 2b which transmits a state reactive or not reactive with a magnetic field as a position signal is mounted on the upper inner surface of a prescribed position in the longitudinal direction of an upper rail 1a, and the magnet piece 2a and the and the magnetic detection sensor 2b are provided inside a slide rail 1 as a position sensor 2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automobile slide seat that is installed so as to be positionally movable by a slide rail in a front-rear direction in a vehicle, and relates to an automobile slide sheet including a position sensor that detects a position of the seat and emits a position signal of the seat. is there.
[0002]
[Prior art]
For example, when the steering wheel is equipped with an airbag module as an occupant restraint device, when the position of the slide seat S is ahead of the steering wheel H as shown in FIG. On the other hand, when it is behind, the operation of the airbag module is controlled so as to delay the deployment start timing of the airbag E.
[0003]
Conventionally, since it is necessary to control the airbag module, it has been proposed to equip the slide rail R with a position sensor P for detecting the relative position of the slide sheet S with respect to the airbag module.
[0004]
As shown in FIGS. 5 and 6, a magnetic actuator 10a such as a magnet piece or an electromagnet that generates a magnetic field and a magnetic detection sensor 10b such as a limit switch or a Hall element that reacts with the magnetic field are used as the position sensor P. There is provided a sensor unit 10 assembled inside the case 10c and a magnetic shielding plate 11 that blocks the magnetic field generated from the magnetic actuator 10b from acting on the magnetic detection sensor 10b.
[0005]
The sensor unit 10 is attached by a bracket plate 13 projecting from a predetermined position in the longitudinal direction of the lower rail 12. On the other hand, the magnetic shielding plate 11 is attached so as to protrude from a predetermined position of the upper rail 14 to the side of the front region extending in the longitudinal direction (Reference Document 1).
[0006]
Conversely, there has been proposed a sensor in which a magnetic sensor is attached to a side of an upper rail so as to protrude therefrom, and a magnetic shield plate is attached to a side of a predetermined area extending in a longitudinal direction of a lower rail (Patent Document 2). ).
[0007]
The position sensor determines whether or not the magnetic shielding plate 11 is positioned at a relative distance between the magnetic actuator 10a and the magnetic detection sensor 10b with the movement of the seat. The circuit is designed to detect the relative position of the airbag module and generate a control signal for controlling the operation of the airbag module.
[0008]
[Patent Document 1]
US Patent No. 6,053,529 [Patent Document 2]
US Pat. No. 5,967,549
Each of the position sensors is mounted on the outside on the side of the slide rail. For this reason, it is easily affected by an article such as a metal product inserted between the seat cushion and the vehicle body floor, which may cause a malfunction. In addition, there is a possibility that problems such as deformation and damage due to insertion of an umbrella or a long object may occur.
[0010]
To solve the problem, a cover or a wire frame for guarding the position sensor may be attached to the side of the slide rail. However, this increases the number of parts and also restricts the space around the slide rail, which is not preferable.
[0011]
[Problems to be solved by the invention]
The present invention reduces the number of parts, prevents the sensor performance from being degraded or damaged due to external factors, enhances the positional accuracy at the time of mounting, improves the sensor performance by reducing the clearance, and reduces the size and weight. It is an object of the present invention to provide a slide sheet for a vehicle with a position sensor which can be manufactured.
[0012]
[Means for Solving the Problems]
In the vehicle slide sheet with the position sensor according to claim 1 of the present invention, the magnet piece is bonded and fixed to the bottom inner surface of the front area or the rear area extending in the longitudinal direction of the lower rail, and the reaction or unreaction with the magnetic field is performed. Is mounted on the upper inner surface at a predetermined position in the longitudinal direction of the upper rail, and the magnet pieces and the magnetic detection sensor are provided as position sensors inside the slide rail.
[0013]
In the slide seat for a vehicle with the position sensor according to the second aspect of the present invention, the magnet piece having the front and rear surfaces facing the longitudinal direction of the lower rail chamfered obliquely outward with a downward slope from the upper edge is adhered and fixed to the bottom inner surface of the lower rail. It is constituted by.
[0014]
The vehicle slide sheet with the position sensor according to claim 3 of the present invention is configured by interposing an iron plate as a yoke and bonding and fixing a magnet piece to an inner surface of the bottom of the lower rail.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a description will be given with reference to FIGS. 1 to 3. The illustrated embodiment is a slide sheet which is installed so as to be movable in a front and rear direction on a slide rail 1 in a vehicle, and detects the position of the slide sheet. The slide rail 1 is provided with a position sensor 2 for issuing a control signal for controlling the operation of the occupant restraint device based on the relative position of the seat to the occupant restraint device as shown in FIG.
[0016]
The slide rail 1 is assembled from an upper rail 1a attached to the lower side of the seat cushion and a lower rail 1b attached to the vehicle floor. The lower rail 1b is installed in the front-rear direction in the vehicle over the moving distance of the seat. The upper rail 1a is provided with rollers (not shown) on the lower side in the longitudinal direction and is supported by the lower rail 1b so as to be movable in the longitudinal direction.
[0017]
The upper rail 1a has a substantially U-shaped cross section from the upper surface 100 and the left and right side surfaces 101, 102, and has outer bending flanges 103, 104 rising from the lower ends of the side surfaces 101, 102 in an L shape. It is bent and formed. The upper rail 1a is provided with a receiving hole 105 for mounting a magnetic detection sensor described later on the upper surface 100.
[0018]
The lower rail 1b has a substantially upward U-shaped cross section that is relatively larger than the upper rail 1a from the bottom surface 110 and the left and right side surfaces 111 and 112, and the outer bending flanges 103 and 104 of the upper rail 1a are positioned inside. The receiving L-shaped inward bending flanges 113 and 114 are formed by bending the upper side of the side surfaces 111 and 112.
[0019]
The position sensor 2 includes a substantially quadrilateral magnet piece 2a and a magnetic detection sensor 2b that emits a reaction or non-reaction with a magnetic field as a control signal. The magnetic detection sensor 2b includes a main body 21 on a lower side via an overhang flange 20, and a connector 22 for connecting to a signal cable on an upper side. The magnetic detection sensor 2b may be provided with a Hall element or a Hall IC that incorporates a Hall element or a Hall IC in the main body 21 for extracting the strength of the magnetic field by an electric signal based on the Hall effect.
[0020]
The magnet piece 2a is provided by being adhesively fixed to the inner surface of the bottom of the lower rail 1b. The magnet piece 2a is set to be disposed on the inner surface of the bottom in a rear region extending in a longitudinal direction from a substantially middle position of the lower rail 1b. The magnetic detection sensor 2b is located inside the main body portion 21 by fitting the main body portion 21 into the receiving hole 105 of the upper rail 1a, covering the receiving hole 105 with the overhanging flange 20 having a large external shape, and from the outside on the upper surface 100 of the upper rail 1a. It is attached. The magnetic detection sensor 2b is set so as to be disposed substantially at the middle in the longitudinal direction on the upper inner surface of the upper rail 1a.
[0021]
Examples of the occupant restraint device include an airbag module provided inside a steering wheel and an airbag module provided inside an instrument panel. The control mode is configured with a CPU including a CPU so that the deployment start timing of the airbag is advanced when the position of the seat is forward, and the deployment start timing of the airbag is delayed when the seat is behind.
[0022]
In the slide sheet with the position sensor configured as described above, the area where the magnetic detection sensor 2b reacts to the magnetic field generated from the magnet piece 2a while the entire sheet moves on the slide rail 1 in the area between the front most and the rear most. Since the magnet piece 2a is not provided, the magnetic detection sensor 2b is divided into a region that does not react with the magnetic field.
[0023]
Since any one of the reaction or non-reaction with the magnetic field by the magnetic detection sensor 2b is transmitted to the CPU as a control signal, the deployment of the airbag is advanced assuming that the seat position is in the front in the reaction area, In the non-reaction area, the operation of the airbag of the airbag module can be controlled so that the deployment start time of the airbag is delayed assuming that the seat is located rearward.
[0024]
In the position sensor 2, the magnet piece 2a is bonded and fixed to the bottom inner surface of the lower rail 1b, and the magnetic detection sensor 2b is fixed to the upper inner surface of the upper rail 1a. The sensor performance can be improved because the clearance can be kept small inside. Further, since the magnetic detection sensor 2b is mounted downward inside the upper rail 1a, it is possible to prevent the sensor performance from being reduced due to the attachment of dust and the like.
[0025]
In addition, since the magnet piece 2a and the magnetic detection sensor 2b are provided inside the slide rail 1, it is hardly affected by external factors such as metal products inserted between the seat cushion and the vehicle body floor. A normal operation state can be maintained by preventing deformation and damage caused by the insertion of an umbrella or a long object. Further, since a guard cover, a wire frame, and the like for the position sensor are not required, the number of parts can be reduced, and the size and weight can be reduced.
[0026]
As shown in FIG. 2, the magnet piece 2a is preferably provided with a front and rear surface facing the longitudinal direction of the lower rail 1b, which is chamfered obliquely outward from the upper end edge in a downward slope. Thus, even if foreign matter enters the lower rail 1b from the front-rear direction, damage due to contact with the foreign matter can be prevented since the corner of the magnet piece 2a is not in the front-rear direction. Further, as shown in FIG. 3, an iron plate 2c may be interposed as a yoke, and the magnet piece 2a may be bonded and fixed to the bottom inner surface of the lower rail 1b. The magnetic flux of the magnet piece 2a is concentrated on the iron plate 2c, so that the magnetic flux can be efficiently applied to the magnetic detection sensor 2b.
[0027]
In the above-described embodiment, the airbag module provided inside the steering wheel and the airbag module provided inside the instrument panel have been described as the occupant restraint device. The present invention can also be applied to a case where the positional relationship between the airbag module and the seat is determined. Further, the front of a tip-up seat or the like in which a seat cushion is flipped up to a seat back in a standing position and a rear seat is moved behind a front seat can also be applied as a position sensor for detecting a strike or rearmost.
[0028]
As a control form by the position sensor, the front most side is set to the magnetic field non-reaction area and the rear most side is set to the magnetic field reaction area. However, the setting can be reversed.
[0029]
【The invention's effect】
As described above, according to the automotive slide sheet with the position sensor according to claim 1 of the present invention, the magnet piece is bonded and fixed to the bottom inner surface of the front area or the rear area extending in the longitudinal direction of the lower rail, and reacts with the magnetic field. Or, a magnetic detection sensor that emits an unresponsiveness as a position signal of the seat is mounted on the upper inner surface at a predetermined position in the longitudinal direction of the upper rail, and the magnet piece and the magnetic detection sensor are provided as position sensors inside the slide rail. It is hardly affected by external factors such as a metal product inserted between the vehicle and the floor of the vehicle, and it is possible to prevent a deformation or damage caused by the insertion of an umbrella or a long object, thereby maintaining a normal operating state. In addition, since a guard cover and a wire frame for the position sensor are not required, the number of parts can be reduced, and the size and weight can be reduced.
[0030]
In addition, the magnetic detection sensor is attached to the upper inner surface at a predetermined position in the longitudinal direction of the upper rail, and the magnet pieces are bonded and fixed to the inner surface at the bottom of the front region or the rear region extending in the longitudinal direction of the lower rail. And the sensor performance can be improved by keeping the clearance small.
[0031]
According to the slide seat for a vehicle with a position sensor according to claim 2 of the present invention, a magnet piece in which the front and rear surfaces facing the longitudinal direction of the lower rail are chamfered obliquely outward from the upper end edge in a downward slope is formed on the bottom inner surface of the lower rail. By adhesively fixing, even if a foreign matter enters from the front and rear direction of the lower rail, damage due to contact with the foreign matter can be prevented since the magnetic piece has no corner in the front and rear direction.
[0032]
According to the slide sheet for a vehicle with a position sensor according to claim 3 of the present invention, the magnetic flux of the magnet piece is concentrated on the iron plate by interposing the iron plate as the yoke and bonding and fixing the magnet piece to the inner surface at the bottom of the lower rail. The magnetic detection sensor.
[Brief description of the drawings]
FIG. 1 is an explanatory view mainly showing a slide rail and a position sensor of an automobile slide sheet according to the present invention.
FIG. 2 is an explanatory view showing a case where a magnet piece having chamfered front and rear surfaces is provided as the position sensor of FIG. 1;
FIG. 3 is an explanatory view showing a case where a magnet piece having an iron plate interposed as a yoke is provided as the position sensor of FIG. 1;
FIG. 4 is an explanatory view showing a slide sheet for a vehicle with a position sensor according to a general example.
FIG. 5 is an explanatory view mainly showing a slide rail and a position sensor of a slide sheet for an automobile according to a conventional example.
FIG. 6 is a sectional view showing a slide rail and a position sensor of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slide rail 1a Upper rail 1b Lower rail 2 Position sensor 2a Magnet piece 2b Magnetic detection sensor 2c Iron plate

Claims (3)

Equipped with an upper rail attached to the lower side of the seat cushion and a lower rail attached to the vehicle body floor as a slide rail, the seat is installed movably in the front and rear direction of the vehicle with the slide rail, and the position of the seat is detected, In a slide seat for an automobile including a position sensor that emits a position signal of the seat,
A magnet piece is adhered and fixed to the bottom inner surface of the front area or the rear area in the longitudinal direction of the lower rail, and a magnetic detection sensor that emits a magnetic field response or a non-reaction as a position signal of the sheet is provided above a predetermined position in the longitudinal direction of the upper rail. A slide sheet for a vehicle with a position sensor, wherein the slide sheet is mounted on an inner surface, and the magnet piece and a magnetic detection sensor are provided as a position sensor inside a slide rail. 2. The vehicle with a position sensor according to claim 1, wherein a magnet piece is formed by chamfering the front and rear surfaces of the lower rail in the longitudinal direction diagonally outward at a downward slope from an upper end edge and fixed to an inner surface of a bottom of the lower rail. Slide sheet. The slide sheet for a vehicle with a position sensor according to claim 1 or 2, wherein an iron plate is interposed as a yoke, and a magnet piece is bonded and fixed to an inner surface of a bottom portion of the lower rail.

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