JPH0554068U - Suspension seat magnetic force generation means - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the scattering of permanent magnets destroyed by impact. [Structure] First and second magnetic force generating means are provided between the vehicle body and the seat body, and the magnetic force generating means is constituted by a pair of magnets attached to the vehicle body side and the seat body side, respectively. The magnets are arranged so that the seat body maintains a state of being levitated at a fixed position above the vehicle body by the interaction of the magnetic forces acting between the pair of magnets, and the first magnetic force generating means includes the pair of magnets. At least one of them is composed of an electromagnet, and the second magnetic force generating means is a suspension sheet in which the pair of magnets is composed of permanent magnets 33 and 34, and the permanent magnets 33 and 34 are non-magnetic. It is covered by the body 37b.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a magnetic force generating means for a vehicle suspension seat that utilizes a magnetic levitation system to insulate vibration.

[0002]

[Prior Art]

 Conventionally, as a suspension seat for an automobile, one using a spring or a damper is generally known, but no one using a magnetic force to insulate vibration is known. However, as an application of magnetic force to automobile seats, plastic magnets are attached to a pair of upper and lower slide rails and the upper rail is slightly lifted to reduce the sliding resistance between the upper and lower rails. Have been published (Preprints of the Society of Automotive Engineers of Japan Academic Lecture Preprints 892, 341-344 pages, 1989.10., Japan Society of Automotive Engineers).

[0003]

[Problems to be solved by the device]

 As described above, in the conventional automobile suspension seat, the vibration is insulated by using the spring for shock absorbing and the damper for damping the vibration, respectively, and combining them. .. However, there are many problems that need to be improved, such as the shock buffering effect of mechanical structures such as springs and dampers is limited, and it may not be possible to cope with sudden bounces of the car. Therefore, in order to deal with various vibrations, the combination of the spring and the damper is devised so that the structure tends to be complicated. Therefore, it is possible to use the magnetic force to levitate the sheet to insulate the vibration.

In such a magnetic levitation suspension sheet, a combination of an electromagnet and a permanent magnet is considered. By using the above together, the power consumption can be saved and the suspension seat can handle all kinds of shocks and vibrations by controlling the amount of power supplied to the electromagnet according to various shocks and vibrations of the automobile. You can enable it. The use of permanent magnets is indispensable also in such a suspension sheet that uses both electromagnets and permanent magnets.

Natural permanent magnetite (main component is Fe ₃ O ₄ ) has been used for permanent magnets, but it has long been artificially made. At present, permanent magnets can be broadly classified into quench-hardening type, precipitation hardening type, and sintering type that are usually manufactured from iron-based alloys.

Among the above, as the one produced by sintering, a mixture of iron, nickel, cobalt, aluminum, cobalt ferrite, iron oxide, barium carbonate, strontium carbonate or samarium cobalt is appropriately added. The resulting alloy is used as a material, and this alloy is crushed, added with an appropriate sintering agent, compressed at high temperature, and then sintered at high temperature to obtain a permanent magnet. Among them, the one using barium carbonate, strontium carbonate or samarium cobalt is commonly called a rare earth magnet, and since both the residual magnetic flux density and the coercive force show extremely large values, this rare earth magnet is now widely used as a permanent magnet. Has been done.

[0007]

[Problems to be solved by the device]

 Therefore, even for permanent magnets applied to suspension seats in which permanent magnets are placed in a narrow space and must support the total weight of the human body and seat members, the above-mentioned residual magnetic flux density and coercive force also show extremely large values for rare earth magnets. Is often used. However, since the rare earth magnet is manufactured by crushing a predetermined magnetic material once and then sintering it as described above, the mechanical strength is not so great, and therefore, the impact or the like is not generated. May be destroyed by and broken into many small pieces. When divided into small pieces, the same poles repel each other depending on the orientation, and the small pieces are scattered.

The present invention has been made in order to solve the above-mentioned conventional inconveniences, and an object thereof is to provide a magnetic force generating means for a suspension sheet in which a permanent magnet destroyed by an impact does not scatter.

[0009]

[Means for Solving the Problems]

 The magnetic force generating means for a suspension seat according to claim 1 of the present invention comprises a seat main body which is vertically movable relative to the vehicle body by a connecting means and whose movement in the vehicle width direction is restricted, and the vehicle body and the seat main body. A first magnetic force generating means and a second magnetic force generating means interposed therebetween, the magnetic force generating means being composed of a pair of magnets attached to the vehicle body side and the seat body side, and the pair of magnets being the seat. The main body is arranged so as to maintain a state of being levitated at a fixed position above the vehicle body by the interaction of the magnetic forces acting between the pair of magnets, and the first magnetic force generating means is at least one of the pair of magnets. One of them is composed of an electromagnet, and the second magnetic force generating means is a suspension seat whose pair of magnets is composed of permanent magnets, and the permanent magnet is composed of a non-magnetic material. It has overturned and is characterized in.

[0010]

[Action]

 According to the magnetic force generating means of the suspension sheet according to the first aspect, since the permanent magnet is covered with the non-magnetic material, the permanent magnet is protected without affecting the magnetic force lines generated from the permanent magnet. The permanent magnet will not scatter even if it is destroyed.

[0011]

【Example】

 FIG. 1 is an explanatory side view showing an example of an automobile suspension seat equipped with a magnetic force generating means according to the present invention. As shown in this figure, a vehicle seat body 1 is composed of a seat bottom 11 which is a seat and a seat back 12 which is a backrest. A suspension frame 2 is provided below the seat back 12, and the suspension frame 2 includes a lower frame 21 fixed to the floor F and an upper frame 22 fixed to the seat bottom 11. It is configured. The both are connected by a pair of front and rear parallel link members 23 (a front link member 23a and a rear link member 23b) that are pivotally supported about a horizontal axis. It is configured so that it can move up and down while maintaining parallelism with each other.

A magnetic unit including a front magnet unit (first magnet unit) 31 and a rear magnet unit (second magnet unit) 32 in the front-rear direction is provided between the lower frame 21 and the upper frame 22. 3 is provided, and the front magnet unit 31 is composed of a fixed-side electromagnet 31a fixed to the lower frame 21 and a floating-side permanent magnet 31b fixed to the upper frame 22 so as to face the fixed-side electromagnet 31a. The rear magnet unit 32 is composed of a fixed permanent magnet body 33 fixed to the lower frame 21 and a floating upper permanent magnet body 34 fixed to the upper frame 22.

The fixed permanent magnet body 33 and the floating permanent magnet body 34 of the rear magnet unit 32 are supported by an upper mount member 34a and a lower mount member 34a, respectively, as shown in FIGS. ..

FIG. 4 is an enlarged sectional view taken along the line AA of FIG. As shown in this figure, each permanent magnet body 33, 34 is formed by arranging a plurality of unit magnets 37 in parallel. The surfaces of these permanent magnet bodies 33, 34 are in a state in which the N-pole surface and the S-pole surface of the unit magnet 37 are alternately arranged. Further, the surfaces of the permanent magnet bodies 33, 34 face each other. In this state, the upper and lower unit magnets 37 are arranged so that the N-pole surface and the S-pole surface thereof face each other to form the second magnetic force generating means.

As shown in FIG. 5, the unit magnets 37 constituting the fixed permanent magnet body 33 and the floating permanent magnet body 34 are surrounded by a magnetic body 37a so as to cover the entire surface thereof. A cover 37b is provided.

In the present embodiment, a rare earth magnet manufactured by sintering is used as the magnetic body 37a, and barium carbonate, strontium carbonate or samarium cobalt is used as the rare earth component of this rare earth magnet. .. Further, as the covering body 37b, a synthetic resin made of either a thermoplastic resin or a thermosetting resin is used.

Examples of the thermoplastic resin include general-purpose plastics such as polyester, polyvinyl chloride, polystyrene, acrylonitrile butadiene styrene and polyethylene terephthalate, general-purpose engineering plastics such as polyamide, polyacetal and polycarbonate, polysulfone and polyamidimide. Alternatively, super engineering plastics such as polytetrafluoroethylene are preferably used.

As the thermosetting resin, phenol resin, urea resin, melamine resin, alkyd resin, unsaturated polyester, epoxy resin, diallyl phthalate, polyurethane or silicone resin is preferably used.

When the magnetic body 37a is coated with the coating body 37b, if the coating body 37b is a thermoplastic resin, a known molding method by thermocompression bonding is used. When the cover 37b is a thermosetting resin, the resin is applied or attached to the surface of the magnetic body 37a at room temperature, and the resin is heated to unitize the magnetic body 37a and the cover 37b. The magnet 37 is obtained.

In the unit magnet 37 illustrated in FIG. 5, one unit magnet 37 is symmetrical and the magnetic body 37a is covered with the covering body 37b, but a plurality of magnetic bodies 37a are covered together. The unit magnet 37 may be covered with a body 37b and a plurality of magnetic bodies 37a may be provided inside.

Further, in the present embodiment, the synthetic resin covering body 37b as described above is adopted, but a metal such as aluminum may be used as long as it is a non-magnetic body.

The unit magnets 37 used in the fixed-side permanent magnet body 33 and the floating-side permanent magnet body 34 configured as described above are composed of the side wall 35a and the partition wall 35b of the lower mount member 33a and the upper mount member 34a, respectively. And the partition wall 35b, and the surface of the partition wall 35b is covered with a non-magnetic aluminum plate 38. The lower mount member 33a supporting the fixed permanent magnet body 33 in such a state is fixed to the lower frame 21 integrated with the floor F by the bolts 36, and similarly supports the floating permanent magnet body 34. The upper mount member 34a is also fixed to the upper frame 22 integrated with the seat bottom 11 by bolts 36.

As shown in FIG. 2, in the front magnet unit 31, the electromagnet 31a has a C-shape, the lower portion thereof is supported by the lower mount member 31c, and the upper mount member 31d is provided in the upper gap of the C-shape. The lower end portion of the floating-side permanent magnet 31b supported by the above is configured to be recessed. The floating permanent magnet 31b and the C-shaped magnet 31a are arranged such that the N pole and the S pole face each other and attract each other on the side surface. Further, since the movement of the both in the vehicle width direction is restricted by the parallel link member 23, the attractive force acts as a restraining force against the vertical displacement of the floating permanent magnet 31b, and the floating permanent magnet 31b acts as C. The floating state is maintained between the character-shaped electromagnets 31a. Note that the floating permanent magnet 31b of the front magnet unit 31 also uses the unit magnet 37 in which the magnetic body 37a is covered with the covering body 37b.

Since the magnet unit 3 is configured as described above, the seat bottom 11 fixed to the floating permanent magnets 31b and 34 via the upper frame 22 is in a state of being lifted from the floor F integrated with the vehicle body. Holding

A seat height adjusting mechanism C is provided in the suspension seat configured as described above. The seat height adjusting mechanism C includes a position detecting means 4 for detecting the position of the seat body 1 in the height direction, a power supply circuit 5 for supplying electric power to the electromagnet 31a of the front magnet unit 31, and the position detecting means. The controller 6 sends a command to the power supply circuit 5 to supply a predetermined output based on the position detection signal input from the controller 4.

As the position detecting means 4, a rotary encoder 41 is used in this embodiment. The rotary encoder 41 is a known detector that detects the rotational displacement of the shaft, and converts the detected rotational displacement into an electric signal (position detection signal) and outputs it to the control device 6. The rotary encoder 41 is provided in the inner portion of the lower frame 21 in the vicinity of the front link member 23 a provided in front of the parallel link member 23. Then, the rotation of the front link member 23a about the horizontal axis is transmitted to the rotary encoder 41 via the meshing of the gears appropriately attached.

In the power supply circuit 5, a battery 51 as a power source, a coil 52 for generating a magnetic force in the electromagnet 31 a, and a field effect transistor 53 are connected in series, and a diode 54 is connected to the coil 52. The cathode side is connected in parallel with the positive side of the battery 51.

The control device 6 is a so-called microcomputer, and judges whether or not the detected position is proper based on the position detection signal from the position detecting means 4, and when it is not proper, Is configured to send an instruction signal for optimization to the power supply circuit 5. A pulse signal is used as the instruction signal. The transmission destination of this pulse signal is the field effect transistor 53 of the power supply circuit 5, and the field effect transistor 53 is caused to switch and supply the power supplied from the battery 51 to the coil 52 at an extremely short cycle. ing .

The field-effect transistor 53 wired in the power supply circuit 5 is a so-called unipolar transistor that carries only a current of either electrons or holes. In the present invention, the switching action of the field effect transistor 53 is utilized.

By the way, in the above pulse signal, the time of the pulse-on state of one cycle is t ₁ , the time of the pulse-off state is t _2, and the total time of the pulse-on state of the unit time t is Σt ₁ , and the pulse-off state is If of the total time and .SIGMA.t _2, the percentage of time has become a pulse-on state .SIGMA.t ₁ during the unit time t is referred to as duty ratio _{DR, DR = Σt 1 / (} Σt 1 + Σt 2) = Σt Expressed as ₁ / t. The larger the value of the duty ratio DR, the longer the pulse-on state of the pulse signal, and therefore the longer the switch-closed state of the field effect transistor 53 within a unit time.

In the pulse signal of 1 cycle, the time t ₁ in the pulse-on state is constant, the time t ₂ in the pulse-off state is variable, and the frequency f of the pulse signal is controlled. Can be variously set. If sand Wachikono the time ft ₁ becomes to be pulse-on state during the unit time, f t ₁ is to become equal to .SIGMA.t ₁ above, eventually them to time t ₁ of the pulse-on state is constant in one cycle For example, the duty ratio DR can be variously changed by controlling the frequency according to the above equation.

Therefore, by changing the duty ratio DR of the pulse signal, the amount of electric power supplied to the coil 52 is increased or decreased, the magnitude of the magnetic force of the electromagnet 31a is controlled, and the floating permanent magnet 31b and The suction force of the seat bottom 11 can be adjusted to control the up and down of the seat bottom 11.

That is, when the duty ratio DR becomes higher than that in the standard state, the switch closing state of the field effect transistor 53 within a unit time becomes longer and the amount of electric power supplied to the coil 52 also increases. The magnetic force of the electromagnet 31a is increased by the increase in the magnetic field, and the repulsive force between the floating permanent magnet 31b and the floating permanent magnet 31b is also strengthened. The seat bottom 11 integrated therewith moves upward.

On the contrary, when the duty ratio DR becomes lower than that in the standard state, the amount of electric power supplied to the coil 52 is reduced by the action opposite to that of the field effect transistor 53, so that the electromagnet 31a and the floating permanent magnet are suspended. The repulsive force with the magnet 31b also weakens, and the sheet bottom 11 moves downward.

In the present embodiment, the time t ₁ in the pulse-on state of one cycle of the pulse signal is made constant, and the duty ratio DR is controlled by changing the frequency of the pulse signal.

FIG. 6 is a block diagram showing the control method of the control device 6 as described above. As shown in FIG. 6, a signal indicating the height of the seat bottom 11 from the position detecting means 4 is sent to the control device 6. Then, in step S1, the control device 6 compares the height (current height) with a reference height that is input in advance. Then, when the height is within the allowable range of the variation of the reference height, that is, when the reference height-the current height ≈ 0, the frequency of the frequency required to maintain the current height is maintained in step S2. The pulse signal is transmitted to the field effect transistor 53 as an instruction signal. Therefore, the field effect transistor 53 receiving this supplies electric power corresponding to the duty ratio DR of the pulse signal to the coil 52, so that the seat bottom 11 is kept in the current height position.

Then, in step S1, if reference height-current height> 0, that is, if the height of the seat bottom 11 is lower than the reference height, step S3 is executed. In this step S3, since the pulse signal whose frequency is higher than that in the reference state is transmitted to the field effect transistor 53 as an instruction signal, the amount of power supplied to the coil 52 increases and the magnetic force of the electromagnet 31a becomes strong. Then, the seat bottom 11 is moved upward and returned to the original reference height.

If it is determined in step S1 that the reference height-the current height <0, that is, the height of the seat bottom 11 is higher than the reference height, step S4 is executed. In this step S4, a pulse signal whose frequency is lower than that in the reference state, as illustrated in the lower part of the box displaying step S4, is transmitted to the field effect transistor 53 as an instruction signal, and is therefore supplied to the coil 52. The amount of electric power to be applied decreases, the magnetic force of the electromagnet 31a becomes weaker, and the seat bottom 11 is moved downward to return to the original reference height.

In the control device 6, the above calculation is always executed based on the position detection signal transmitted from the position detection means 4 as an analog signal or a digital signal, and the electric field effect of the power supply circuit 5 is executed each time. Since the above-mentioned instruction signal is transmitted to the transistor 53, the seat bottom 11 is always kept at a constant height.

The magnetic force generating means of the present invention is applied to the fixed permanent magnet 33 and the floating permanent magnet 34 of the floating magnet 31b of the front magnet unit 31 and the rear magnet unit 32 of the suspension seat configured as described above. Since it is used, even if the magnetic body 37a of the unit magnet 37 is broken in these portions, the broken pieces are held by the covering body 37b and are not scattered.

[0041]

[Effect of the device]

 As described above, according to the present invention, in the suspension seat in which the seat body is supported by the magnetic force generating means, the unit magnet of the permanent magnet body used for the magnetic force generating means is a magnetic body and a non-magnetic body covering the surface thereof. First of all, the magnetic field lines emitted from the magnetic material are not affected by the coating.

When the magnetic body is destroyed by vibration during traveling of the automobile, the destroyed body is not covered with the covering body, and thus the broken pieces are not scattered around.

In addition, when the covering body is a synthetic resin, it is easy to manufacture and the covering body can be tough.

[Brief description of drawings]

FIG. 1 is an explanatory side view showing an example of an automobile suspension seat equipped with a magnetic force generating means according to the present invention.

FIG. 2 is a front view showing an example of a vehicle suspension seat equipped with a magnetic force generating means according to the present invention.

FIG. 3 is a rear view showing an example of an automobile suspension seat equipped with magnetic force generating means according to the present invention.

FIG. 4 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 5 is a partially cutaway perspective view of a unit magnet.

FIG. 6 is a block diagram showing a control system of the control device.

[Explanation of symbols]

 1 Seat 11 Seat Bottom 12 Seat Back 2 Suspension Frame 21 Lower Frame 22 Upper Frame 23 Parallel Link Member 23a Front Link Member 23b Rear Link Member 3 Magnet Unit 31 Front Magnet Unit 31a Electromagnet 31b Flying Permanent Magnet 32 Rear Magnet Unit 33 Fixed Side Permanent magnet 34 Levitating permanent magnet 4 Position detection means 5 Power supply circuit 51 Battery 52 Coil 53 Field effect transistor 54 Diode 6 Controller F Floor

Claims (1)

[Scope of utility model registration request] 1. A seat body which is vertically movable with respect to a vehicle body by a connecting means and whose movement in a vehicle width direction is restricted,
A first magnetic force generating means and a second magnetic force generating means interposed between the vehicle body and the seat body, wherein the magnetic force generating means is composed of a pair of magnets attached to the vehicle body side and the seat body side, The pair of magnets are arranged so that the seat body maintains a state of being levitated at a fixed position above the vehicle body by the interaction of the magnetic forces acting between the pair of magnets. At least one of the magnets is an electromagnet, and the second magnetic force generating means is a suspension sheet in which the pair of magnets are permanent magnets, and the permanent magnets are covered with a non-magnetic material. The magnetic force generating means of the suspension seat characterized in that.