JPH0741809B2 - Seat support device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat support device that supports a seat by vertically attracting the permanent magnets so that the seat floats in the vertical direction of the vehicle body and is supported so as to be movable in the front-rear direction. .

(Prior art and problem to be solved) In a supporting device for a slide seat of an automobile, as shown in FIG. 8, an upper rail 31 is placed on a lower rail 30 fixed to the floor side, and the lower rail 30 and the upper plate 31 are connected to each other. The roller 32 and the ball bearings 33, 33 are interposed between the rollers 32 to support the load of the upper rail 31 by the roller 32, and the rolling of the roller 32 and the ball bearings 33, 33 allow the upper rail 31 to move in the front-back direction. The seat (not shown) placed and fixed on the upper rail 31 and the load of the occupant to be seated are supported, and the seat can be moved in the front-rear direction.

However, the slide sheet having the above-mentioned structure is not suitable for the roller movement during movement, especially when seated on the sheet.
There is a problem that the rolling resistance of the 32 and the ball bearing 33 is large and the operability is poor.

By the way, in recent years, development of small-sized, lightweight and high-performance permanent magnets has been promoted, and its application to transportation facilities and the like is becoming a reality. As a magnetic levitation method that supports the load by using the magnetic force of the permanent magnets, as shown in FIG. 9, the permanent magnets 35 and 36 are arranged vertically with the same magnetic poles facing each other on the fixed side and the floating side. And the floating permanent magnet above the fixed permanent magnet 35.
A repulsive levitation system in which 36 is arranged to support the load F applied to the air bearing side by the repulsive force F _R of these permanent magnets 35 and 36, and the permanent magnet on the fixed side as shown in FIG. A permanent magnet 38 on the air bearing side is arranged below the magnet 37, and magnetic poles different from each other are opposed to each other so that a load F applied to the air bearing side is supported by an attractive force F _A between these permanent magnets 37 and 38. There is a suction floating method.

However, the former repulsive levitation method has an advantage that the vertical position of the levitation side is stable according to the load F, but on the other hand, it has a big problem that it is easy to shift to the left and right and the permanent magnets 35 and 36 are easily demagnetized. . In addition, the latter suction floating method,
Although the change in levitation force with respect to left-right deviation is small, the left-right position is relatively stable, and it is difficult to demagnetize, on the other hand, the vertical position of the levitation side cannot be adjusted, and other electromagnetic forces There is a problem that the configuration is complicated because the position control is required by the combined use.

The present invention has been made in view of the above points, and the vertical position on the seat side is stable according to the load, the stable position is obtained on the left and right positions, the seat can be slid smoothly, and It is an object of the present invention to provide a suction-floating type sheet support device that can be configured only by a permanent magnet as a structure that is difficult to magnetize.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, first and second permanent magnets having magnetic poles attracting each other separated and opposed to each other and extending in parallel in the vehicle front-rear direction are provided. A third permanent magnet is disposed between the first and second permanent magnets with a small gap so as to be attracted to each other and move in the vehicle up-down direction and the vehicle front-rear direction. A permanent magnet is fixed to either the vehicle body side or the seat side, the third permanent magnet is fixed to either the seat side or the vehicle body side, and the first and second permanent magnets and the third permanent magnet. The load applied to the seat side is supported by the suction force acting between and.

(Operation) When no load is applied to the seat side, the permanent magnets on the seat side are stationary in a state of being aligned with the permanent magnets on the vehicle body side. When a load is applied to the seat-side magnet, the magnet is displaced from the body-side magnet in the load direction, that is, downward. When the self-made seat side shifts downward with respect to the magnet on the vehicle body side, the magnet on the seat side receives a suction force to be returned to the original position by the magnet on the vehicle body side. This attractive force acts in the upward direction opposite to the direction of the load, and as a result, the magnet on the seat side stands still at the position where the load and the attractive force reach equilibrium. This supports the load on the seat side. The seat does not receive a reaction force of the attractive force of the magnet in the sliding direction, and can be smoothly slid.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the principle of the seat supporting apparatus of the present invention, which is composed of three permanent magnets (hereinafter simply referred to as “magnets”) 1 to 3, and the magnets 1 and 2 are opposed to each other at a predetermined interval. The magnets 3 are arranged parallel to each other with a slight gap (gap) between the magnets 1 and 2. The magnets 1 and 2 on both sides are arranged so that the N pole and the S pole face each other so as to attract each other. Further, the magnet 3 is arranged such that its magnetic poles face each other so as to attract the magnets 1 and 2 on both sides. That is, the south pole of the magnet 3 faces the magnetic pole N of the magnet 1, and the north pole faces the south pole of the magnet 2.

The magnets 1 and 2 on both sides are fixed to, for example, the vehicle body side (hereinafter referred to as “fixed side”), and the central magnet 3 is fixed to the seat side (hereinafter referred to as “floating side”) (both not shown). . In addition, the magnets 1 and 2 on both sides are on the floating side, and the magnet 3 in the center is
May be fixed to the fixed side, respectively.

In the state where no load is applied, the magnet 3 on the floating side is in a stable state in which the magnet 3 is stationary alongside the magnets 1 and 2 on the fixed side, as shown in FIG. The lines of magnetic force by these three magnets 1 to 3 are shown by dotted lines.

When a load (load) F is applied to the magnet 3 on the floating side in this state, the magnet 3 is displaced downward according to the load F as shown in FIG. It deviates from 2. Then, the magnet 3 receives the attractive force F _A from the fixed magnets 1 and 2, and is pulled upward in the figure to return to the original stable position. As a result, the magnet 3 stands still at a position where the load F and the attractive force F _A are balanced as shown in FIG.
This makes it possible to support the load on the floating side.

The upper and lower positions of the magnet 3 are stable according to the load F, and the left and right positions also have stable points. Moreover, since the magnets 1 to 3 are arranged so as to attract each other, it is difficult to demagnetize. Of course, in actual use, it is necessary to provide a stopper that regulates downward displacement of the magnet 3, a guide that regulates lateral displacement, and the like.

Also, as shown in FIG. 3, one of the fixed sides, for example, the magnet 1
The magnet 4 is arranged on the opposite side of the magnet 4 so as to be attracted to the magnet 1 with a slight gap, and the magnet 4 is arranged to face the magnet 1.
The magnet 3 and the magnet 3 may be fixed to the floating side. By thus arranging the magnets on the floating side in two rows, the levitation force can be further increased.

Of course, a large number of permanent magnets are alternately arranged on the fixed side and the floating side so that the adjacent magnets attract each other, and these adjacent permanent magnets are alternately fixed to the fixed side and the floating side. Alternatively, it is possible to obtain a desired levitation force by increasing the length of each magnet 1 to 3 in FIG. Further, the levitation force greatly varies depending on the performance of the magnet used. However, this is a design problem and may be set appropriately according to the specifications. For example, in a small space,
Moreover, when a large load is to be supported, it can be dealt with by using a high-performance magnet such as a samarium-cobalt (Sm-Co) magnet to obtain a large levitation force.

By the way, for the magnets 1 to 3, we adopted neodymium plastic magnets with 30 mm (H) x 24 mm (W) and a sectional ratio of 0.8 (W / H).
Each gap between magnets 1 and 2 and magnet 3 is 1 mm, magnet 3
If the sinking amount is 0.8 mm, the magnets 1 to 3 will be
Fig. 4 shows the relationship between the H) ratio and the levitation force (kgf). As is clear from FIG. 4, the magnets 1 to 3 are vertically and horizontally (W / H)
A levitation force of approximately 60 kgf could be obtained within the ratio range of 0.75 to 2.0. The maximum levitation force was obtained when the aspect ratio (W / H) was around 1.2.

Next, a structure for supporting a slide seat of a vehicle to which the suction floating method is applied will be described.

5 and 6, the slide seat 10 is a flat floor long slide type seat, and is movable in the front-rear direction by two left and right seat slide rails 11 and 11 '. The lower rail 12 of the seat slide rail 11 on one side has a substantially U-shaped cross section, the central portion 12a of the bottom surface is formed lower than both sides 12b and 12c, and the flanges are formed on both sides of the opening end. 12d and 12d are formed so as to project outward substantially horizontally over the entire length. The lower rail 12 is formed of a non-magnetic member such as an aluminum alloy member.

The magnets 15 and 16 are rod-shaped with a square cross section, and the lower rail 12
It is disposed inside and is fixed to the bottom surface 12b and the side surface 12e, and the bottom surface 12c and the side surface 12f, respectively, and the opposite end surfaces are the bottom surfaces 12b and 12c.
The end surface of each step and the upper surface are flush with the opening end surface. The magnets 15 and 16 have north and south poles facing each other so that the opposite end surfaces attract each other. These magnets 15,
16 is arranged along the longitudinal direction of the lower rail 12 over the entire length. At the open end of the lower rail 12, a magnet 15,
A nonmagnetic member for protecting 16 is attached, for example, protective plates 13, 13 formed of a synthetic resin member.

The upper rail 14 is approximately half the length of the lower rail 12 (FIG. 5), its cross-sectional shape is a substantially inverted U-shape, and the inner method is the flanges 12d, 12d of the lower rail 12.
It is set slightly wider than the foreign law of the lower rail 12
Are fitted so that they can be held from above. Similar to the lower rail 12, the upper rail 14 is made of a non-magnetic member such as an aluminum alloy.

Magnets 17 and 18 are fixed to the inner center of the upper surface 14a of the upper rail 14 along the longitudinal direction and at the front and rear ends through a support member 19 formed of the synthetic resin member. Further, on the inner surface of the upper surface 14a of the upper rail 14, a protection plate 20, which is formed of a non-magnetic member such as a synthetic resin member, faces the protection plates 13 and 13 fixed to the lower rail 12,
Twenty is fixed. Like the magnet 15, the magnets 17 and 18 have a rectangular rod-shaped cross section, and are arranged so as to face each other with a slight gap between the magnets 15 and 16 fixed to the lower rail 12 and to attract each other. It is set up.

These magnets 15-18 are made of, for example, neodymium plastic magnets. Further, the magnets 15 to 18 are lined up with a number of magnets having a length that can be easily magnetized,
It is set to the required length for the upper rail 14. The magnets 17 and 18 of the upper rail 14 are
Even when 14 is moved to the front end or rear end position of the lower rail 12, the magnets 15 and 16 of the lower rail 12 can face each other without being disengaged from the front end or the rear end.

A needle bearing 21 is fixed to the inner surface of the open end of the side surface 14b of the upper rail 14, and a plurality of stoppers 22 are fixed to the inner surface of the open end of the side surface 14c at appropriate intervals along the longitudinal direction.
The stopper 22 is made of a non-magnetic member such as a synthetic resin member. The upper end surfaces of the needle bearing 21 and the stopper 22 are capable of contacting the lower surfaces of the flanges 12d, 12d of the lower rail 12, and prevent the upper rail 14 from deviating from the lower rail 12 as described later.

The roller of the needle bearing 21 is brought into contact with the side surface 12e of the lower rail 12 so as to be rollable, and the stopper 22 is slightly separated from the side surface 12f of the lower rail 12. And
When the needle bearing 21 is in contact with the side surface 12e of the lower rail 12, the magnets 17 and 18 fixed to the upper rail 14 are located between the magnets 15 and 16 fixed to the lower rail 12 and have a slight gap. Face each other.

The slide rail 11 ′ on the other side is also configured similarly to the slide rail 11. Each member of the slide rail 11 'corresponding to the slide rail 11 is denoted by a dash "'". And each of these slide rails 11, 1
1'is arranged in parallel along the front-rear direction of the vehicle so that the needle bearings 21 and 21 'are on the outside,
Lower rails 12 and 12 'are fixed to the floor respectively, and brackets 24, 24, 24' and 24 'are respectively attached to the upper surfaces of the upper rails 14 and 14'.
The seat 25 is placed and fixed via the.

In this state, the needle bearings 21 and 21 'of the upper rails 14 and 14' are located on opposite sides of the lower rails 12 and 12 '.
The stoppers 22 and 22 'are slightly contacted with the side surfaces 12f and 12f', which are lightly contacted with the side surfaces 12f and 12f '. This allows
The upper rails 14 and 14 'are laterally positioned through the needle bearings 21 and 21' to prevent lateral displacement and to be movable in the longitudinal direction. Further, the needle bearing 21 and the stopper 22 prevent the upper rail 14 from moving upward. And the upper rail
Magnets 17, 18 fixed to 14, 14 'are lower rails 12,
The magnets 15 and 16 fixed to 12 'face each other with a slight gap between them.

The operation will be described below.

For convenience of explanation, the slide rail 11 on one side will be described.

When the seat 25 is not seated, the magnets 17 and 18 of the upper rail 14 are set to the lower rail as shown in FIG.
The sheet 25 stands still at a position substantially aligned with the magnets 15 and 16 on the 12 side, and the seat 25 is supported by being floated. And sheet 25
When the occupant is seated on, the load F corresponding to the weight of the occupant is applied to the magnets 17 and 18 via the seat 25 and the upper rail 14, and the magnets 17 and 18 are pushed downward.

On the other hand, when the magnets 17 and 18 move downward and deviate from the magnets 15 and 16 on both sides, the magnets 15 and 16 receive an attractive force F _A to return to their original positions and are pulled upward. As a result, the seat 25 stops at a position where the load F and the suction force F _A are in equilibrium. As a result, the seat 25 is supported in a floating state, and the sitting comfort is significantly improved as compared with the conventional support mechanism that is supported only by the seat spring.

Further, the attractive force acting between the magnets 15 and 16 and the magnets 17 and 18 acts only on the vertical movement (displacement) of the magnets 17 and 18, and does not act on the forward and backward movements. Does not work. Moreover, the magnets 17 and 18 of the upper rail 14 can face each other without being disengaged from the front ends or the rear ends of the magnets 15 and 16 of the lower rail 12 even when the upper rail 14 moves to the front end or the rear end position of the lower rail 12. Therefore, even if the seat 25 is moved to the front end or rear end position of the lower rail 12,
No attractive force is generated in the front-back direction between the magnets 5 and 16 and the magnets 17 and 18.

Further, the needle bearing 21 is used as a positioning bearing for preventing the lateral movement of the upper rail 14, and since the needle bearing 21 is in line contact with the side surface 12e of the lower rail 12, a magnet for the needle bearing 21 is used as compared with a ball bearing.
The convergence of the magnetic flux by 15 is reduced, and the attraction force to the magnet 15 is reduced. As a result, sliding resistance when the upper rail 14 is moved in the front-rear direction is reduced. Further, since the needle bearing 21 is lightly contacted with the side wall 12e of the lower rail 12, the sliding resistance is extremely small.

As a result, the seat 25 can be slid in the front-rear direction with an extremely small force even when seated, and the operability is improved.

Further, when an excessive load is applied to the seat 25 and the attraction force between the magnets 15 to 18 is exceeded, the protective plate 20 of the upper rail 14,
20 and the protective plates 13, 13 of the lower rail 12 come into contact with each other, so that the lower rail 12 directly supports the upper rail 14. At this time, the magnets 15 and 16 on the lower rail 12 side are protected by the protective plates 13, 13 and 2
Direct contact with the upper rail 14 is prevented and protected by 0 and 20. On the other hand, the magnet 17 on the upper rail 14 side,
The bottom surface of 18 is slightly separated from the central portion 12a of the bottom surface of the lower rail 12 so as to be protected. At this time, the load of the seat 25 is supported by a seat spring (not shown) built in the seat 25.

By the way, there are many structural restrictions on vehicles, especially passenger cars, and it is not possible to make the height of the seat from the floor surface, the lateral width, etc. too large. Therefore, in this embodiment, the magnet 15
~ 18, 30mm (H) x 24mm (W), cross section ratio 0.8
(W / H) neodymium plastic magnet is adopted, and the gap between opposing magnets can be adjusted to 1-5 mm.

Incidentally, the displacement of the seat 25 when the gaps between the magnets 15 and 16 and the magnets 17 and 18 are set to 1 mm (sinking amount mm)
Fig. 7 shows the relationship between the calculated levitation force and the actual applied load (kgf). The solid line in the figure indicates the calculated value, and each point indicates the measured value. The load includes the weight of the seat 25 and the upper rail 14.

In the above embodiment, the case where both the vehicle body-side lower rail 12 and the seat-side upper rail 14 are formed of non-magnetic members has been described, but if at least the seat-side upper rail 14 is formed of a non-magnetic member, A magnetic member can be used for the lower rail 12 on the side.

(Effects of the Invention) As described above, according to the present invention, between the first and second permanent magnets that extend in the vehicle front-rear direction in parallel with the magnetic poles attracting each other separated and opposed to each other, A third permanent magnet is disposed so as to attract each other with each other and to be movable in the vehicle up-down direction and the vehicle front-rear direction, and a third gap is provided. It is fixed to either one of the seat side, the third permanent magnet is fixed to the other of the seat side or the vehicle body side, and acts between the first and second permanent magnets and the third permanent magnet. Since the load applied to the seat side by the attractive force is supported, the vertical position on the seat side is stable according to the load, and stable points are obtained on the left and right positions. Do not easily demagnetize because they act to attract each other. Therefore, the load can be stably supported for a long period of time. The seat does not receive a reaction force of the attractive force of the magnet with respect to the sliding direction, and there is no contact between the seat side and the vehicle body side so that friction does not occur, so that there is no slide resistance and smooth sliding is possible. . Further, the attraction and levitation type load supporting device can be configured only by the permanent magnets, and there are excellent effects such that the device can be simplified and the cost can be reduced.

[Brief description of drawings]

FIGS. 1 to 3 are views showing the principle of a suction floating system using a permanent magnet of a sheet supporting apparatus according to the present invention, and FIG.
FIG. 5 is a graph showing the relationship between the vertical / horizontal (W / H) ratio of the magnet and the levitation force, FIG. 5 is a side view showing an embodiment of a vehicle slide seat to which the present invention is applied, and FIG. Arrow line VI-VI in Fig. 5
FIG. 7 is a cross-sectional view taken along the direction, FIG. 7 is a graph showing the relationship between the displacement (sinking) amount of the seat in the slide seat supporting mechanism shown in FIG. 9 and 10 are cross-sectional views of a slide rail used in a slide sheet, showing the principle of conventional magnetic levitation. 1-4, 15-18 …… Permanent magnet, 10 …… Slide sheet,
11, 11 '…… Slide rail, 12 …… Lower rail, 14…
… Upper rails, 13,20 …… Protective plate, 21 …… Needle bearing, 22 …… Stopper, 25 …… Seat.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Kamata 5-3-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation (72) Inventor Yoichi Taniguchi 5-33-8 Shiba, Minato-ku, Tokyo No. Mitsubishi Motors Industry Co., Ltd. (72) Inventor Taiji Hattori 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Co., Ltd. (72) Inventor Eisuke Shoda 3-12-24 Kitakokubun, Ichikawa-shi, Chiba ( 72) Inventor Katsunori Aoki 643 Sekishinta, Kawasato-mura, Kita-Saitama-gun, Saitama Prefecture (72) Minor Tamura 2-33-1 Otsugaoka, Numanan-cho, Higashi-Katsushika-gun, Chiba Prefecture (56) Reference JP-A-51- 95557 (JP, A) JP-A-48-80940 (JP, A)

Claims (1)

[Claims] 1. Between first and second permanent magnets extending in the vehicle front-rear direction in parallel so that magnetic poles attracting each other are separated and opposed to each other, and these permanent magnets are attracted to each other and the vehicle upper and lower sides. The third permanent magnet with a small gap movably in the vehicle direction and the vehicle front-rear direction, and the first and second permanent magnets are fixed to either the vehicle body side or the seat side. The permanent magnet No. 3 is fixed to either the seat side or the vehicle body side, and the load applied to the seat side by the attraction force acting between the first and second permanent magnets and the third permanent magnet is supported. A seat supporting device.