JP2011033124A - Electromagnetic suspension device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic suspension device capable of restraining a force acting on a shock absorbing member in excessive contraction. <P>SOLUTION: In the electromagnetic suspension device, a bearing groove 41 communicating with a space 43 between a rod and a mover is formed at the inner peripheral side of a bearing 21. When bump rubber 45 and a rod 37 (an electromagnetic shock absorber 3) are maximally contracted, compressed air in a space 55 among the bump rubber, the rod, the mover and the bearing passes from the bearing groove 41 through the space 43 between the rod and the mover, a mover hole 29 and an air hole easily discharged to the outside. Thus, an internal pressure rise in the space 55 among the bump rubber, the rod, the mover and the bearing, which may occur at the excessive contraction of the electromagnetic shock absorber when the bearing groove 41 is not formed can be quickly and surely restrained. Furthermore, as the internal pressure rise in the space 55 can be restrained, the force acting on the bump rubber 45 is reduced to lengthen a life of the bump rubber 45. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic suspension device.

  2. Description of the Related Art Conventionally, as an example of an electromagnetic suspension device, there is a device including a stator and a mover that are provided so as to be relatively movable, and an impact absorbing member (bump stopper) (see Patent Document 1).

JP 2002-257189 A

By the way, in the electromagnetic suspension device, a large force may act on the shock absorbing member due to the compressed air in the sealed space formed by the shock absorbing portion and its surrounding members when the stator and the movable member, and thus the device is shrunk. Therefore, it is desired to suppress the above.
An object of the present invention is to provide an electromagnetic suspension device capable of suppressing a force acting on an impact absorbing member during shrinkage.

  The electromagnetic suspension device according to the first aspect of the present invention includes a cylindrical stator, a stator magnetic member disposed on the inner peripheral surface of the stator, and an innermost position of the stator. And a mover magnetic force disposed on the outer peripheral surface of the mover so as to oppose the stator magnetic force member. A member, a bearing disposed on the inner peripheral surface of the mover, and a slidably supported by the bearing, one end connected to the stator, and the other end disposed inside the mover. A rod and a cylindrical shock absorbing member that is disposed outside the rod on one end side and that abuts against the end of the mover at the closest position to absorb the shock, and the shock at the closest position. Formed by the absorbing member, the rod, the end of the mover and the bearing. Characterized in that that the space is provided the communication passage communicating with the outside through the movable element.

  According to the first aspect of the present invention, it is possible to suppress the force acting on the shock absorbing member during the shrinkage.

It is sectional drawing which shows the electromagnetic suspension apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the electromagnetic suspension apparatus of FIG. 1 in the state shrunk. It is sectional drawing which shows the bump rubber of the electromagnetic suspension apparatus of FIG. 2, a bearing, and its vicinity part. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows 2nd Embodiment of this invention corresponding to FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows 3rd Embodiment of this invention corresponding to FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows 4th Embodiment of this invention corresponding to FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows 5th Embodiment of this invention corresponding to FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows 6th Embodiment of this invention corresponding to FIG.

Hereinafter, an electromagnetic suspension device according to a first embodiment of the present invention will be described with reference to FIGS.
1 and 2, the electromagnetic suspension device 1 according to the present embodiment is configured using an electromagnetic shock absorber 3. The electromagnetic shock absorber 3 is disposed inside the stator 7 and a bottomed cylindrical stator 7 in which an armature coil (hereinafter simply referred to as a coil 5) as a stator magnetic member is disposed on the inner peripheral side. And a bottomed cylindrical movable element 9 that moves relative to the stator 7 in a linear direction between the closest approach position and the furthest separated position. The electromagnetic suspension device 1 further includes control means (not shown) for controlling the relative movement of the stator 7 and the mover 9 (and hence the operation of the electromagnetic shock absorber 3) by controlling the energization to the coil 5. The stator 7 has a tip end portion (hereinafter, appropriately referred to as “stator tip end portion 11”) thicker than a bottom portion (hereinafter, appropriately referred to as “stator bottom portion 13”). Yes. The stator tip side portion 11 has the coil 5 arranged on the inner peripheral side thereof, and constitutes an armature 15 together with the coil 5.

  The mover 9 has a permanent magnet 16 as a mover magnetic force member disposed on the outer peripheral side thereof so as to face the coil 5. As shown in FIGS. 3 and 4, an annular convex portion 19 that protrudes inward is formed on the inner peripheral side of the distal end portion of the mover 9 (hereinafter referred to as the mover distal end portion 17). . The annular convex portion 19 has annular concave portions 23 in which bearings 21 to be described later are disposed on the distal end side of the mover 9 and the opposite side thereof, respectively, on the wall portions (hereinafter referred to as annular concave portion forming first and second wall portions 25, respectively). 27)). A hole (hereinafter referred to as a mover hole 29) that communicates the outside and the inside is formed in the bottom side portion of the mover 9.

The electromagnetic shock absorber 3 fixes the bottom of the stator 7 (hereinafter referred to as the stator bottom 31) to a vehicle body (on a spring) (not shown), and the bottom of the mover 9 (hereinafter referred to as the mover bottom 33). .) Is fixed to an axle or a carriage (unsprung) and is interposed between the sprung and unsprung parts.
The electromagnetic shock absorber 3 includes an outer cylinder 35 that extends from the mover bottom 33 so as to form a double cylinder together with the mover 9. The outer cylinder 35 may be provided with a spring receiver for a spring (not shown) interposed between the sprung and unsprung parts.

The electromagnetic shock absorber 3 further includes a hollow rod 37 having one end connected to the stator bottom 31 and the other end disposed inside the mover 9. The rod 37 incorporates a position sensor 39 that measures the positional relationship between the armature 15 and the mover 9. The position sensor 39 is housed in a hollow portion of the rod 37, has a cylindrical position sensor main body 39A in which a Hall element is provided, and a lower end fixed to the mover bottom 33, and extends from the position sensor main body 39A so as to extend and contract. The position sensor main body 39A is an external view. The position sensor 39 may not be provided.
Then, when the mover 9 slides on the rod 37 so as to follow the magnetic field generated from the coil 5 of the armature 15, the stator 7 and the mover 9 move relative to each other (in other words, the electromagnetic shock absorber). 3 expands and contracts).
The bearing 21 is arranged in the annular recess 23 of the mover 9 so as to smoothly slide on the rod 37 (movement in the linear direction) so as to be between the mover 9 and the rod 37. Has been. The bearing 21 has a substantially annular shape, and a groove (hereinafter referred to as a bearing groove 41) is formed on the inner peripheral side thereof. The bearing groove 41 communicates with a space formed between the rod 37 and the mover 9 (hereinafter, referred to as a rod-mover space 43). In the present embodiment, the bearing groove 41 forms a communication path.

A bump rubber 45 is disposed outside the one end side of the rod 37 as an impact absorbing member that abuts against the end of the mover 9 at the closest position and absorbs the impact.
The bump rubber 45 has a disk-shaped bottom portion (hereinafter referred to as a bump rubber bottom portion 49) having a predetermined thickness in which a hole for passing the rod 37 (hereinafter referred to as a bump rubber bottom portion hole 47) is formed, and a bump rubber. And a substantially cylindrical bump rubber 45 main body 51 which is provided so as to rise from the bottom 49 and through which the rod 37 passes, and has a substantially cylindrical shape as a whole. The bump rubber 45 through which the rod 37 is passed is connected to the stator bottom 31 as described above, so that the bump rubber bottom 49 is opposite to the bump rubber main body 51 (upper side in FIG. 1, left side in FIG. 3). ) Is in contact with the stator bottom 31, and the outer peripheral surface of the bump rubber bottom 49 is in contact with the inner peripheral surface of the stator bottom side portion 13.

In the present embodiment, the mover 9 and the stator 7 are relatively contracted, and the contraction operation proceeds. As shown in FIG. 2, the tip of the mover 9 hits the bump rubber 45 and the contractor of the mover 9 is contracted. Operation will be stopped. Further, in the present embodiment, the stroke is contracted at the position where the distal end portion of the movable element 9 (the end portion of the movable element distal end portion 17) hits the bump rubber 45 and the contraction operation of the movable element 9 is stopped. A cut position (hereinafter also simply referred to as a “shrink-off position”, which corresponds to the closest approach position) is configured.

Further, in the present embodiment, the above-described movable element 9 and the stator 7 are relatively extended, and the annular recess-forming second wall portion 27 hits the rubber rebound stopper 100, so that the expansion operation of the movable element 9 is stopped. This position constitutes a position where the stroke is fully extended (hereinafter also simply referred to as a fully extended position, which corresponds to the most separated position).

  In the electromagnetic suspension device 1 configured as described above, when the mover 9 is at the stroke contracted position with respect to the stator 7 (in other words, when the electromagnetic shock absorber 3 is in the contracted state), the bump The rubber 45 receives a force from the mover 9 and is greatly contracted as compared with the case of FIG. At this time, the volume of the space between the bump rubber 45 and the rod 37 is greatly reduced. On the other hand, the air inside the electromagnetic shock absorber 3 is released to the outside through an air hole 53 provided in the outer cylinder 35.

  Further, when the bump rubber 45 and the rod 37 (electromagnetic shock absorber 3) are shrunk, a space formed by the bump rubber 45 (impact absorbing member), the rod 37, the end of the movable element 9, and the bearing 21 (hereinafter referred to as the bearing 21). The air compressed with the volume change of the bump rubber, rod, mover, and bearing space 55) is changed from the bearing groove 41 formed in the bearing 21 to the rod-mover space 43, the mover hole 29, and the like. It passes through the air hole 53 and is easily discharged to the outside. In other words, by providing the bearing groove 41, an air escape path is formed in the bump rubber / rod / mover / bearing space 55, and the rod rubber / mover is moved from the bump rubber / rod / mover / bearing space 55. Air movement to the interspace 43 is performed smoothly. For this reason, when the bearing groove 41 is not provided, an increase in internal pressure of the bump rubber / rod / mover / bearing space 55 that can occur when the electromagnetic shock absorber is shrunk can be quickly and reliably suppressed.

  Further, since the increase in the internal pressure of the bump rubber / rod / mover / bearing space 55 can be suppressed, the force acting on the bump rubber 45 is reduced, and the life of the bump rubber 45 can be extended. Further, as the force acting on the bump rubber 45 is reduced, it is possible to adopt a bump rubber having a low proof stress, so that the selection range of the bump rubber 45 is widened and the apparatus is made inexpensive. Can do.

In the said 1st Embodiment, the coil 5 as a stator magnetic force member was provided in the inner peripheral side of the stator 7, and the case where the permanent magnet 16 as a mover magnetic force member was arrange | positioned in the outer peripheral side of the needle | mover 9 was made into the example. However, instead of this, a permanent magnet as a stator magnetic member may be provided on the inner peripheral side of the stator 7, and a coil as a mover magnetic member may be arranged on the outer peripheral side of the mover 9.
Moreover, in the said embodiment, although the case where the permanent magnet 16 as a mover magnetic force member was arrange | positioned at the outer peripheral side of the needle | mover 9 was used as an example, it replaces with this as a mover magnetic force member at the outer peripheral side of the needle | mover 9 (In this case, a coil 5 as a stator magnetic member is provided on the inner peripheral side of the stator 7).
Moreover, in the said 1st Embodiment, although the case where the stator 7 and the needle | mover 9 were cylindrical was taken as an example, not only this but other shapes, such as a rectangle and an ellipse, may be sufficient if it is cylindrical. good.

In the first embodiment, the case where the substantially annular bearing 21 in which the bearing groove 41 (communication path) is formed on the inner peripheral side is used as an example, but instead, as shown in FIGS. 5 and 6. An electromagnetic suspension device 1A using an electromagnetic shock absorber 3A having a bearing (hereinafter referred to as a split-type bearing 21A) configured by assembling two substantially arc-shaped members (hereinafter referred to as a bearing component 61). (Second Embodiment) may be configured.
In the second embodiment, the two bearing components 61 are assembled as a split bearing 21A so as to be substantially annular with a gap (hereinafter referred to as a bearing component gap 63) therebetween. . In this 2nd Embodiment, the clearance gap 63 between bearing structure bodies comprises a communicating path.

In the second embodiment, the air in the bump rubber / rod / mover / bearing space 55 is easily discharged from the gap 63 between the bearing components to the rod / mover space 43 and then to the outside, and the bump rubber / rod / An increase in internal pressure in the space between the mover and the bearing 55 can be suppressed.
In this 2nd Embodiment, although the case where the split-type bearing 21A obtained by the assembly | attachment of the two bearing structure bodies 61 was used as the bearing 21, it is not restricted to this, Three or more bearing structure bodies are used. A split-type bearing composed of 61 may be used.

In the first embodiment, the case where the substantially annular bearing 21 in which the bearing groove 41 (communication path) is formed on the inner peripheral side is used as an example, but instead, as shown in FIGS. The electromagnetic suspension device 1B (third embodiment) may be configured using an electromagnetic shock absorber 3B having a bearing (hereinafter, referred to as a flat surface forming bearing 21B) having two flat surfaces 67 formed on the outer peripheral side. .
The flat surface 67 of the flat surface forming bearing 21B used by the electromagnetic suspension device 1B according to the third embodiment extends to the end surface (end surface on the left and right sides in FIG. 7) of the bearing 21B. Further, the flat surface forming bearing 21B forms a gap (hereinafter referred to as a bearing-to-wall space 69) between each of its both end surfaces and each of the first and second wall portions 25, 27 forming the annular recess. Then, it is disposed in the annular recess 23.
Since the flat surface forming bearing 21 </ b> B has a flat surface 67, the flat surface forming bearing 21 </ b> B is referred to as a gap (hereinafter referred to as a bearing outer peripheral side space 73) between the bottom of the annular recess 23 (hereinafter referred to as an annular recess bottom 71) in the mover 9. ) Is formed. The bearing outer peripheral side space 73 communicates with the rod / mover space 43 via the bearing / wall space 69 and thus the outside.

In the third embodiment, the air in the bump rubber / rod / mover / bearing space 55 is easily transferred from the bearing / wall space 69 and the bearing outer space 73 to the rod / mover space 43 and thus to the outside. It is discharged and the increase in the internal pressure of the bump rubber / rod / mover / bearing space 55 can be suppressed.
In the third embodiment, two flat surfaces 67 are formed. However, the present invention is not limited to this, and the flat surfaces 67 may be formed at one location or three or more locations.
Further, in the third embodiment, the flat surface 67 is formed on the outer peripheral side of the bearing 21 in order to form the bearing outer peripheral space 73 (communication path), but instead of the flat surface 67, a groove is formed. You may comprise so that it may form.

In the first to third embodiments, the case where the communication path is formed in the bearing 21 is taken as an example. However, the present invention is not limited to this, and the communication path may be provided in the movable element 9. An example of this (fourth embodiment) is shown in FIGS. In the electromagnetic shock absorber 3C of the electromagnetic suspension device 1C according to the fourth embodiment, as shown in FIGS. 9 and 10, a hole as a communication path on the distal end side of the mover 9 (hereinafter referred to as a mover air vent hole 75). Is forming.
Two mover air vent holes 75 are formed on the portion of the mover 9 where the bearing 21 is formed so as to face each other about the axis of the mover 9.
One end side of the mover air vent hole 75 opens at the tip end surface of the mover 9, and the other end side extends along the axis of the mover 9 to the second wall portion 27 where the annular recess is formed. A path that bends and opens toward the rod-mover space 43 (hereinafter referred to as a mover air vent hole first passage 77) and one end side of the first wall portion 25 in the annular recess formation space between the rod and the mover. 43, the other end of which is connected to the mover air vent hole first passage 77 (hereinafter referred to as the mover air vent hole second passage 79).

In the fourth embodiment, the air in the bump rubber / rod / mover / bearing space 55 is easily discharged from the mover air vent hole 75 to the rod / mover space 43 and then to the outside. An increase in internal pressure in the space between the mover and the bearing 55 can be suppressed.
In 4th Embodiment, although the case where the 2 needle | mover air vent holes 75 were formed was taken as an example, you may form not only this but 1 or 3 or more.

Further, an electromagnetic suspension device may be configured by forming a communication path in the rod 37. This example of an electromagnetic suspension device (fifth embodiment) is shown in FIGS. In the electromagnetic shock absorber 3D of the electromagnetic suspension device 1D according to the fifth embodiment, as shown in FIGS. 11 and 12, the portion facing the bearing 21 at the closest position on one end side of the rod 37 (hereinafter referred to as a rod bearing corresponding portion 81). A groove (hereinafter referred to as a rod air vent groove 83) as a communication path is formed on the outer peripheral side of the. Two rod air vent grooves 83 are formed with the axis of the rod 37 in between.
The length of the rod air vent groove 83 is set to a value larger than the length between the first and second wall portions 25 and 27 forming the annular recess, and one end thereof is connected to the bump rubber 45 at the closest position. It faces and the other end faces the annular recess forming second wall portion 27.

In the fifth embodiment, the air in the bump rubber / rod / mover / bearing space 55 is easily discharged from the rod air vent groove 83 to the outside of the rod / mover space 43 and then to the outside. An increase in the internal pressure of the inter-bearing space 55 can be suppressed.
In the fifth embodiment, the case where two rod air vent grooves 83 are formed is taken as an example. However, the present invention is not limited to this, and one rod or three or more rods may be formed.

Further, the electromagnetic suspension device may be configured by forming a communication path in the bump rubber 45. This example of an electromagnetic suspension device (sixth embodiment) is shown in FIG. In the electromagnetic shock absorber 3E of the electromagnetic suspension device 1E according to the fifth embodiment, as shown in FIG. 13, a single passage (hereinafter referred to as a bump rubber passage 87) is formed in the bump rubber 45 as a communication passage. .
The bump rubber passage 87 is generally composed of three grooves (hereinafter referred to as bump rubber first, second and third grooves) 89, 91 and 93 which are bent and communicated with each other.
The bump rubber first groove 89 is formed on the contact surface side of the bump rubber bottom portion 49 with the stator bottom portion 31 so as to extend in the radial direction from the inner peripheral side to the outer peripheral side.
The bump rubber second groove 91 has one end connected to the bump rubber first groove 89 and the other end formed on the outer peripheral surface of the bump rubber bottom 49 extending in the height direction of the bump rubber 45 (left-right direction in FIG. 13). Has been.
The bump rubber third groove 93 is formed such that one end is connected to the bump rubber first groove 89 and the other end extends in the height direction of the bump rubber 45 inside the bump rubber bottom 49 (bump rubber bottom hole 47). Yes.
The other end of the bump rubber third groove 93 faces the bump rubber / rod / mover / bearing space 55.

In the sixth embodiment, the air in the bump rubber / rod / mover / bearing space 55 is easily discharged from the bump rubber passage 87 to the outside through the gap between the stator 7 and the mover 9. The increase in the internal pressure of the bump rubber / rod / mover / bearing space 55 can be suppressed.
In the sixth embodiment, an example is described in which one bump rubber passage 87 is formed. However, the present invention is not limited to this, and two or more bump rubber passages 87 may be formed.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C, 1D, 1E ... Electromagnetic suspension apparatus, 21 ... Bearing, 21A ... Split-type bearing, 21B ... Flat surface forming bearing, 5 ... Coil (stator magnetic member), 6 ... Stator, 9 ... Movable element, 16 ... Permanent magnet (movable element magnetic member), 37 ... Rod, 41 ... Bearing groove (communication path), 45 ... Bump rubber (impact absorbing member), 55 ... Bump rubber / rod / mover / bearing space (Space formed by the shock absorbing member, the rod, the end of the mover, and the bearing at the closest position).

Claims (1)

A cylindrical stator,
A stator magnetic member disposed on the inner circumferential surface of the stator;
A cylindrical mover that is arranged inside the stator and moves in a linear direction relative to the stator between a closest approach position and a most spaced position;
A mover magnetic member disposed on an outer peripheral surface of the mover so as to face the stator magnetic member;
A bearing disposed on an inner peripheral surface of the mover;
A rod that is slidably supported by the bearing, one end is connected to the stator, and the other end is disposed inside the mover;
It is arranged outside the one end side of the rod, and comprises a cylindrical impact absorbing member that abuts against the end of the mover at the closest position and absorbs the impact,
A communication path that communicates the space formed by the shock absorbing member, the rod, the end of the mover, and the bearing at the closest position to the outside through the mover is provided. Electromagnetic suspension device.

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