JP5488192B2 - In-vehicle structure of compressor - Google Patents

Description

  The present invention relates to an on-vehicle structure of a compressor, and more particularly to an on-vehicle structure of a compressor provided with a linear motor as a drive source.

Recently, power is supplied from the vehicle-mounted secondary battery, an electric vehicle to obtain running power to drive the vehicle in the motor by the electric power from the viewpoint of zero emissions (hereinafter sometimes referred to as EV) does not discharge the CO ₂ Attention has been paid. Hybrid electric vehicles (hereinafter sometimes referred to as HEVs) that use both an engine and a motor as a driving power source are also rapidly spreading.

  Motors mounted on electric vehicles and hybrid vehicles as described above are required to be small and have high output in order to be mounted in a limited space, and the temperature of the motor is required to maintain the output performance. It is essential to suppress the rise, and more specifically, to cool the stator coil.

  As a related art document related to this, Japanese Patent Laid-Open No. 2000-125512 (Patent Document 1) discloses a coil end contact cooling type rotating electrical machine. In this rotating electrical machine, at least the coil ends of the stator coils are overlapped with each other in the radial direction by axially protruding portions made of thin plate-like conductors protruding from the end face of the stator core in a posture in which the thickness direction coincides with the radial direction of the stator core. It is composed. And providing a heat conductive cooling member having a flat cooling surface that is insulatively intimately adhered to the flat main surface of the thin plate conductor at the radially outermost or radially innermost side of the coil end. Describes improving the cooling performance of the coil end portion 2d.

JP 2000-125512 A

  By the way, it is conceivable to use a superconducting motor as a motor mounted on the EV or HEV. A superconducting motor has a plurality of coils made of a superconducting wire, and when the coil is cooled to a predetermined cryogenic temperature (for example, 70 K) and a current, strictly speaking, a direct current is passed, the electric resistance is substantially zero. Therefore, it is promising for reducing the electric power consumption of the motor and the EV.

  In order to mount a superconducting motor as a power source, it is necessary to mount a refrigerator capable of cooling a coil made of a superconducting wire to an extremely low temperature. However, this refrigerator is also required to be small and have high refrigeration performance because of the limitation of the mounting space.

  As the above refrigerator, for example, a regenerative refrigerator, a Stirling refrigerator, or the like is used. This Stirling refrigerator includes a compressor including a piston that is driven to reciprocate in a cylinder by a linear motor, and a cold storage unit in which, for example, helium gas, which is a compressed gas that is repeatedly compressed and expanded in the compressor, flows into and out of the compressor. .

  When such a Stirling refrigerator is mounted on the vehicle, for example, when the vehicle travels on a rough road at a relatively high speed, periodic vertical vibrations may occur in the vehicle body. When the vibration frequency at this time corresponds to the reciprocal vibration frequency of the vibration system including the linear motor mover and the piston of the linear motor in the compressor of the Stirling refrigerator, the resonance significantly increases the amplitude, resulting in damage. There is a fear.

  The objective of this invention is providing the vehicle-mounted structure which mounts a compressor in a vehicle so that the linear motor which comprises a compressor may not be damaged by the vertical vibration of a vehicle body.

An on-vehicle structure of a compressor according to the present invention includes a linear motor stator, a linear motor including a linear motor mover that linearly reciprocates by a magnetic field generated by the linear motor stator, and the linear motor mover. An on-vehicle structure of a compressor, comprising: a fixed piston shaft; and a piston that is provided at an end of the piston shaft and reciprocally moves in a cylinder to compress and expand refrigerant gas . A part of a regenerative refrigerator for cooling a coil made of a superconducting wire of a superconducting motor, which is a power source of a vehicle, from a coil end portion, and the moving direction of the linear motor movable element is along the horizontal direction the regenerative refrigerator is the superconducting motor including a compressor is characterized in Rukoto is mounted on a vehicle fitted together.

  Here, the horizontal direction is not limited to a complete horizontal direction, but also includes a case where the horizontal direction is inclined at a predetermined angle, and the predetermined angle is preferably ± 30 degrees, preferably ± 10 degrees. It is more preferable that

  In the on-vehicle structure of the compressor according to the present invention, the compressor may be mounted on the vehicle such that the moving direction of the linear motor mover is along a direction orthogonal to the traveling direction of the vehicle. Here, the orthogonal direction is not limited to a direction that completely intersects the traveling direction of the vehicle at 90 degrees, but also includes a direction that intersects the traveling direction of the vehicle in a predetermined angle range including 90 degrees. The angle range is preferably 60 to 120 degrees.

  Further, in the on-vehicle structure of the compressor according to the present invention, the piston shaft fixed through the linear motor movable element is formed on an inner wall of the motor housing that houses the linear motor on both sides in the axial direction of the linear motor movable element. Each may be supported by a fixed flexure bearing.

Further, in the vehicle structure of the compressor according to the present invention, the refrigerator including the compressor may be integrally attached to end plates located at the axial end portion of the superconducting motor or the superconducting motor It may be integrally attached on the outer peripheral side wall of the motor case.

  According to the on-vehicle structure of the compressor according to the present invention, even when vertical vibration is continuously applied to the vehicle body, for example, when the vehicle travels on a rough road at a relatively high speed, the linear motor movable element, the piston shaft, and Since the reciprocating direction of the vibration system including the piston is a horizontal direction, the vertical vibration of the vehicle body does not resonate the vibration system, so that the linear motor can be prevented from being damaged. The reliability with respect to vehicle body vibration of an electric vehicle using the compressor, the superconducting motor cooled by the compressor, and the superconducting motor as a power source is improved.

It is a schematic block diagram of the electric vehicle to which the vehicle-mounted structure of the compressor which is one Embodiment of this invention is applied. It is sectional drawing (a part side surface is included) along the axial direction of the superconducting motor shown in FIG. It is the sectional view on the AA line in FIG. It is a longitudinal cross-sectional view (a part side surface is included) of the compression part of a refrigerator. It is a perspective view which shows the flexure bearing contained in the compression part shown in FIG. It is a schematic block diagram of the electric vehicle to which the vehicle-mounted structure of the compressor which is another embodiment of this invention is applied. It is a schematic block diagram which shows the modification of the electric vehicle shown in FIG.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like.

  In the following description, an electric vehicle will be described as an example of an electric vehicle, but the present invention may be applied to other electric vehicles such as a hybrid vehicle.

  FIG. 1 shows a schematic configuration of an electric vehicle 1 that employs a compressor on-vehicle structure 100 according to an embodiment of the present invention. In FIG. 1, the arrow X direction indicates the vehicle traveling direction, that is, the vehicle longitudinal direction, and the arrow Y direction orthogonal to the vehicle traveling direction indicates the vehicle lateral direction, that is, the vehicle width direction. In FIG. 1, the direction along the plane of the paper is the horizontal direction when the vehicle is placed on a horizontal plane, and the direction perpendicular to the plane of the paper is the vertical direction.

  The electric vehicle 1 is equipped with a superconducting motor 12 as a driving power source. The rotor shaft 18 (see FIG. 2) of the superconducting motor 10 is connected to the front axle 3 connected to the two front wheels 2 via a transmission 11 provided integrally with the superconducting motor 10. Thereby, the rotational power output from the rotor shaft 18 of the superconducting motor 10 is transmitted to the front wheels 2 via the transmission 11 and the front axle 3.

  The electric vehicle 1 also includes two rear wheels 4, a rear axle 5 connected to each rear wheel 4, and a rear differential gear 6 to which the rear axle 5 is coupled. The two rear wheels 4 are driven to rotate when the electric vehicle 1 is traveling.

  Superconducting motor 10 is mounted in engine compartment 7 located in the front part of electric vehicle 1. The superconducting motor 10 is fixed to the vehicle body 8 via a mounting member (not shown) such as a bracket or a mount. That is, the electric vehicle 10 is an FF (front engine / front drive) vehicle.

  Superconducting motor 10 includes first and second refrigerators 16 and 17 integrally. Each of the refrigerators 16 and 17 has a compression unit with a built-in linear motor, and when the electric vehicle 1 is placed on a horizontal plane, the moving direction of the linear motor movable element of each compression unit is along the horizontal direction. An on-vehicle structure 100 in which the compressor is mounted on an electric vehicle is employed. Next, the superconducting motor 10 will be described in detail with reference to FIGS.

  As shown in FIGS. 2 and 3, the superconducting motor 10 includes a rotor 12 that is rotatably supported, a substantially cylindrical stator 14 that covers the outer periphery of the rotor 12, and both axial end surfaces of the superconducting motor 10. Two fixed refrigerators 16 and 17 are provided. In the description here, regarding the rotation center axis R of the rotor shaft 18 passing through the center of the rotor 12, the direction along this is referred to as the axial direction, and the radial direction orthogonal to the rotation center axis R is referred to as the radial direction. A direction along a circle drawn on a plane including the radial direction with the axis R as a central point is referred to as a circumferential direction.

  The rotor 12 includes, for example, a cylindrical rotor core 20 formed by laminating electromagnetic steel plates and integrally formed by caulking, welding, or the like, and a rotor shaft 18 made of a round bar steel material that is fixed through the center hole of the rotor core 20. including. A plurality of (six or six locations in the present embodiment) permanent magnets 22 are fixed to the outer peripheral surface of the rotor core 20 at equal intervals in the circumferential direction. However, the permanent magnet provided in the rotor core 20 may not be exposed on the outer peripheral surface, and may be embedded in the vicinity of the outer peripheral surface.

  The rotor shaft 18 of the rotor 12 is rotatably supported at both end portions 19a and 19b by bearing members 28 fixed to disk-like end plates 24 and 26 that form both axial end surfaces of the superconducting motor 10. . As a result, when a rotating magnetic field is formed inside the stator 14, the permanent magnet 22 of the rotor core 20 is attracted accordingly and the rotor 12 is driven to rotate.

  The stator 14 includes a stator core 30 that is a substantially cylindrical stator core. A plurality (9 in this embodiment) of teeth portions 32 projecting radially inward are formed at equal intervals in the circumferential direction on the inner circumferential portion of the stator core 30. The stator core 30 can be configured by, for example, laminating a plurality of substantially annular electromagnetic steel plates in the axial direction and assembling them integrally by caulking, bonding, welding, or the like. However, the stator core 30 may be configured by arranging nine divided stator cores each having one tooth portion in a ring shape and fastening them with a cylindrical fastening member from the outside. In this case, the divided stator core can be formed of a dust core.

  A coil 34 made of a superconducting wire is wound around the teeth portion 32 of the stator core 30. The superconducting wire may have a circular cross section or a rectangular shape. For the superconducting wire, for example, an yttrium superconducting material or a bismuth superconducting material is preferably used. However, the superconducting material constituting the superconducting wire is not limited to these, and may be another known superconducting material or a superconducting material developed in the future and exhibiting superconducting characteristics at a higher temperature.

  The superconducting wire constituting the coil 34 may be coated with insulation. Thereby, when it winds closely as the coil 34, the electrical insulation between each turn is ensured. However, when the superconducting wire is not covered with insulation, electrical insulation between the turns may be secured by winding the coil 34 in a coil shape while sandwiching an insulating paper or an insulating film.

  Coil 34 includes a portion 35 positioned in a slot formed between adjacent teeth portions 32, and coil end portions 36 that protrude outward from both axial end surfaces of stator core 30. Each coil 34 is connected in series with every other coil 34 and constitutes a U, V, W phase coil. One end of each phase coil is connected to each other at a neutral point (not shown), and the other end of each phase coil is connected to each phase current introduction terminal (not shown).

  The superconducting motor 10 has a cylindrical motor case 40. The rotor 12 and the stator 14 are accommodated in the motor case 40. Both end portions in the axial direction of the motor case 40 are connected to the outer peripheral edge portions of the end plates 24 and 26 in an airtight state. The motor case 40 and the end plates 24 and 26 are made of a nonmagnetic material such as stainless steel, for example. The motor case 40 may be formed integrally with the end plate 24 or 26.

  In the motor case 40, an inner cylinder member 42 and an outer cylinder member 44 each having a cylindrical shape are arranged concentrically with the rotor 12. Both end portions in the axial direction of the inner cylinder member 42 and the outer cylinder member 44 are connected to the inner surfaces of the end plates 24 and 26 so as to maintain an airtight state. The inner cylinder member 42 is preferably formed of a non-metallic material that does not hinder the passage of a magnetic field and is non-conductive. On the other hand, the outer cylinder member 44 is preferably formed of a low thermal conductivity material (for example, FRP), and more preferably is formed of a nonmagnetic material having a low thermal conductivity.

  The inner cylinder member 42 has a slightly larger inner diameter than the rotor core 20 of the rotor 12, and a uniform gap is formed in the circumferential direction between the inner cylinder member 42 and the outer peripheral surface of the rotor core 20. A first vacuum chamber 46 formed of a cylindrical space is formed between the inner cylinder member 42 and the outer cylinder member 44. In the first vacuum chamber 46, the stator 14 including the coil 34 is accommodated. The outer peripheral surface of the stator core 30 of the stator 14 is fixed in close contact with the inner peripheral surface of the outer cylinder member 44.

  After the superconducting motor 10 including the refrigerators 16 and 17 is assembled, the first vacuum chamber 46 is evacuated from an air vent hole (not shown) formed in at least one of the end plates 24 and 26 to be in a vacuum state. Maintained. Thus, the stator 14 including the coil 34 accommodated in the first vacuum chamber 46 is formed by partitioning with the inner cylinder member 42 and the outer cylinder member 44 having low thermal conductivity and making the inside vacuum. It is possible to improve the heat insulation.

  Further, a second vacuum chamber 48 formed of a cylindrical space is formed between the outer cylinder member 44 and the motor case 40. Similarly to the first vacuum chamber 46, the second vacuum chamber 48 is also in a vacuum state. Thereby, the stator 14 including the coil 34 accommodated in the first vacuum chamber 46 is separated from the outside of the motor by the second vacuum chamber 48, so that the heat insulating effect on the stator 14 including the coil 34 can be further enhanced. .

  In the superconducting motor 10, the first refrigerator 16 is provided on the end plate 24 located on one end side in the axial direction, and the second refrigerator 17 is provided on the end plate 26 located on the other end side in the axial direction. It has been. The first and second refrigerators 16 and 17 are attached via cylindrical brackets 50 fixed around the through holes of the end plates 24 and 26 while ensuring an airtight state. Thus, by providing the two refrigerators 16 and 17 integrally as a part of the superconducting motor, the space required for mounting on the vehicle can be made as small as possible.

  In addition, although demonstrated here as providing two refrigerators 16 and 17 in each end plate 24 and 26 of the superconducting motor 10, a superconducting motor may be comprised so that only one refrigerator may be included.

  The first and second refrigerators 16 and 17 are gas compressors (hereinafter simply referred to as compression) in which a piston 54 linearly reciprocates in a cylinder 52 to repeatedly compress and expand refrigerant gas (for example, He gas). 56). The first and second refrigerators 16 and 17 have cooling stepped columnar outer shapes extending from the inside of the cylindrical bracket 50 to the first vacuum chamber 46 through the through holes of the end plates 24 and 26. 58 respectively. The flat front end surface of the cooling part 58 is in contact with the coil end part 36 via the heat transfer member 60. Here, an insulating member such as insulating paper is interposed between at least one of the coil end portion 36 and the heat transfer member 60 and between the heat transfer member 60 and the cooling portion 58, so that the coil 34 and the refrigeration are cooled. Electrical insulation between the machines 16, 17 may be ensured.

  The first and second refrigerators 16 and 17 have a cooling performance that allows the coil 34 made of a superconducting wire to be cooled to a desired cryogenic temperature (for example, about 70 K) at which superconducting characteristics are exhibited, and the stroke of the piston 54 is increased. The cooling temperature can be adjusted by controlling. In the superconducting motor 10 mounted as a driving power source for the electric vehicle 1, the refrigerators 16 and 17 are preferably small and light in order to limit the installation space and reduce the vehicle weight. For example, a regenerative Stirling refrigerator is suitably used for the first and second refrigerators 16 and 17. However, when installation space and weight restrictions are loose, for example, when the superconducting motor 10 is used as a power source for a large moving body such as a train or a ship, or as a power source for a machine having a fixed installation position. As long as the refrigerator has the cooling performance as described above, it may be a refrigerator having a large physique and heavy.

  The first and second refrigerators 16 and 17 are arranged to face each other so that the moving directions of the pistons 54 are on the same straight line. That is, the first and second refrigerators 16 and 17 are provided to face each other in the axial direction. In the first and second refrigerators 16 and 17, the compressor 56 is driven so that the pistons 54 move in opposite directions. In other words, the first and second refrigerators 16 and 17 are driven so that the compression stroke and the expansion stroke by the piston 54 are synchronized with each other. With such an arrangement and drive, the rotational moment exerted on the superconducting motor 10 by the first and second refrigerators 16 and 17 by the movement of the piston 54 is canceled, and vibration and noise can be suppressed.

  In the above description, the first and second refrigerators 16 and 17 are fixed on the end plates 24 and 26. However, the present invention is not limited to this, and the compressor 56 of each refrigerator 16 and 17 is a motor. It is good also as a structure which connects to the cooling part 58 of each refrigerator 16 and 17, respectively, on the outer peripheral side wall of case 40, and the compressed gas flow path pipe | tube extended | stretched from each compressor 56, respectively. In this way, the axial width of the superconducting motor 10 can be reduced, and vehicle mountability is improved.

  The heat transfer member 60 with which the front end surface in the axial direction of the cooling unit 58 of the first refrigerator 16 contacts is formed of, for example, a metal plate having good thermal conductivity, and has an annular shape that is continuous in the circumferential direction. All coil end portions 36 located on the side are in contact. On the other hand, the heat transfer member 60 in contact with the axial front end surface of the cooling unit 58 of the second refrigerator 17 is formed of, for example, a metal plate having good thermal conductivity, and has an annular shape that is continuous in the circumferential direction. All the coil end portions 36 located on the other side in the axial direction are in contact with each other. Thereby, the cooling part 58 of each refrigerator 16 and 17 can absorb heat from the coil end part 36 via the heat-transfer member 60, and can cool the coil 34. FIG.

  A concave portion or a groove into which the coil end portion 36 is fitted is formed on the coil facing surface of the heat transfer member 60. By doing in this way, the contact area of the coil end part 36 and the heat-transfer member 60 increases, and the cooling efficiency of the coil 34 can be raised.

  Further, the heat transfer member 60 may be integrally formed with the coil end portion 36 by molding an insulating resin material. Thereby, the electrical insulation between the coil 34 and the cooling unit 58 of the refrigerators 16 and 17 is further improved. In this case, in order to improve the thermal conductivity of the heat transfer member 60, it is preferable to disperse metal particles or powder in the insulating resin material.

  As described above, in the superconducting motor 10 of the present embodiment, the two refrigerators 16 and 17 cool the coil 34 to the desired cryogenic temperature quickly and efficiently from both sides in the axial direction without interposing the stator core 30 having a large heat capacity. be able to. Therefore, it is possible to shorten the starting time of the superconducting motor 10 and reduce the power consumption of the refrigerator.

  In the superconducting motor 10 of the present embodiment, the first and second refrigerators 16 and 17 are arranged such that the moving directions of the pistons 54 are on the same straight line, and the pistons 54 are in directions opposite to each other. When the compressor 56 is driven so as to move to the rotational speed, the rotational moment exerted on the superconducting motor 10 by the first and second refrigerators 16 and 17 is canceled by the movement of the piston 54, so that vibration and noise can be suppressed.

  Next, the compressor 56 of the first and second refrigerators 16 and 17 will be described in detail with reference to FIGS. Here, the compressor 56 of the second refrigerator 17 will be described as an example, but the compressor 56 of the first refrigerator 56 also has the same configuration.

  As described above, the compressor 56 includes the cylinder 52 that encloses the cylindrical space, and the columnar piston 54 that reciprocates linearly along the arrow B direction in the cylinder 52. The piston 54 is slightly smaller than the inner diameter of the cylinder 52, and is designed to be able to reciprocate in the cylinder 52 in a non-contact state while forming a slight gap with the inner surface of the cylinder, as will be described later. Has been.

  The cylinder 52 is formed in a motor housing 72 that houses a linear motor 70 for driving the piston 54. An opening 76 through which the refrigerant gas to be compressed flows in and out is formed in one end surface 74 in the arrow B direction of the motor housing 72 so as to communicate with the cylinder 52.

  The linear motor 70 is disposed in a motor housing chamber 78 formed on the opposite side of the opening 76 from the cylinder 52 in the motor housing 72. The linear motor 70 includes a linear motor stator 82 and a linear motor movable element 82. The linear motor stator 80 is fixed to the inner wall of the motor housing chamber 78 by means such as screwing. A plurality of coils are wound around the inner periphery of the linear motor stator 80. By energizing these coils, a magnetic field that moves in the direction of arrow B is formed inside the linear motor stator 80.

  On the other hand, a linear motor movable element 82 is disposed in a non-contact state inside the linear motor stator 80. The linear motor movable element 82 may be a permanent magnet type movable element that includes a permanent magnet, or may be an electromagnetic type movable element that is excited by energization of a coil. Such a linear motor movable element 82 is linearly reciprocated by a repulsive force and an attractive force with respect to a moving magnetic field formed by the linear motor stator 80.

  A piston shaft 55 penetrates and is fixed to the center portion of the linear motor movable element 82. As a method of fixing the linear motor movable element 82 and the piston shaft 55, various means such as welding, caulking, and screwing can be employed. A piston 54 is connected to one end of the piston shaft 55 (the left end in FIG. 4). The piston shaft 55 is supported by leaf springs 84 on both sides of the linear motor movable element 82 therebetween. The piston shaft 55 is fixed to the leaf spring 84. Specifically, the leaf spring 84 that is externally mounted on the piston shaft 55 can be fixed on the outer peripheral surface of the piston shaft 55 by various means such as welding, caulking, and screwing.

  The plate spring 84 is configured by overlapping a plurality of flexure bearings 86 that are disc-shaped plate springs made of, for example, thin steel plates as shown in FIG. In the flexure bearing 86, a piston shaft mounting hole 88 is formed at the center portion, and a plurality of fixing holes 90 are formed at the outer peripheral edge portion so as to be evenly arranged in the circumferential direction. A leaf spring 84 composed of a plurality of flexure bearings 86 is fixed to the inner wall of the motor accommodating chamber 78 by bolts inserted into the fixing holes 90 and nuts screwed into the bolts as necessary. Yes.

  The flexure bearing 86 is formed with three spiral slits 92 that are arranged in the circumferential direction so as to surround the piston shaft mounting hole 88. The number, width, length, shape, and the like of these slits 92 are appropriately designed so that a desired in-plane spring constant and a plane orthogonal spring constant can be obtained for the leaf spring 84. Here, the in-plane spring constant is determined so that the vibration system including the piston 54, the piston shaft 55, and the linear motor movable element 82 fixed to the center mounting hole 88 is coaxial with the cylinder 52 at the center position of the leaf spring 86. On the other hand, the plane-orthogonal spring constant is an elastic constant that is set so as to ensure the resonance state of the vibration system including the piston 54 that reciprocally moves when driven by the linear motor 70.

  The in-plane spring constant of the plate spring 84 is the superconductivity including the compressor 56 so that the reciprocating direction of the linear motor movable element 82 in the compressor 56, that is, the reciprocating direction of the piston 54 in the cylinder 52 is along the horizontal direction. When the motor 10 is mounted on the vehicle 1, that is, when the compressor 56 is mounted on the vehicle so that the arrow B direction in FIG. 4 is in the horizontal direction, there is a slight gap between the cylinder inner surface and the piston outer peripheral surface. It is set to be formed. Further, the plane orthogonal spring constant of the leaf spring 84 is determined when the linear motor 70 is continuously driven with the maximum stroke amount in a state where the piston operating direction of the compressor 56 is along the horizontal direction as described above. However, it is set in consideration that the leaf spring 84 is not damaged.

  In the above, the motor housing 72 may be divided into a cylinder forming part in which the cylinder 52 and the opening 76 are formed and a motor housing chamber forming part in which the motor housing chamber 78 is formed. Further, the motor housing chamber forming portion may be constituted by a cylindrical member having both ends opened and a disc-shaped end plate member that closes one opening of the cylindrical member. By dividing the motor housing 72 in this way, the ease of assembly of the compressor 56 including the linear motor 70, the piston 54, the piston shaft 55, and the leaf spring 84 is improved.

  Referring to FIG. 2 again, the compressors 56 of the first and second refrigerators 16 and 17 are connected to the superconducting motor 10 so that the reciprocating direction of the piston 54 is parallel to the rotation center axis R of the rotor core shaft 18. It is attached to. 1 again, the superconducting motor 10 is mounted on the body 8 of the electric vehicle 1 in a posture in which the rotation center axis R of the rotor shaft 18 is along the horizontal direction and orthogonal to the vehicle traveling direction. . That is, in the in-vehicle structure 100 of the compressor 56 of the present embodiment, when the vehicle 1 is placed on a horizontal plane, the reciprocating direction (arrow B direction) of the linear motor movable element 82 of the compressor 56 is along the horizontal direction. A compressor 56 is mounted on the vehicle 1 so as to be orthogonal to the vehicle traveling direction (arrow X direction). Here, the “horizontal direction” is not limited to a complete horizontal direction, but includes a case where the horizontal direction is inclined at a predetermined angle, and the predetermined angle is preferably ± 30 degrees. More preferably ± 10 degrees. The term “perpendicular to the vehicle traveling direction” is not limited to a direction that intersects the vehicle traveling direction completely at 90 degrees, but a direction that intersects the vehicle traveling direction in a predetermined angle range including 90 degrees. The predetermined angle range is preferably 60 to 120 degrees.

  In the electric vehicle 1 in which the superconducting motor 10 is mounted by such an on-vehicle structure 100, even when periodic vibrations in the vertical direction are continuously applied to the vehicle body 8 when traveling on a rough road at a relatively high speed, for example, Since the reciprocating direction of the vibration system including the linear motor movable element 82, the piston shaft 55 and the piston 54 is the horizontal direction, the vertical vibration of the vehicle body 8 does not resonate the vibration system. Further, the leaf spring 84 composed of the flexure bearing 86 with the in-plane spring constant set as described above can firmly receive the load of the vibration system of the compressor 56 during the vertical vibration of the vehicle. Therefore, the linear motor 70 can be prevented from being damaged, and the compressor 56 using the linear motor 70 as a drive source, the superconducting motor 10 cooled by the refrigerators 16 and 17 including the compressor 56, and the superconducting motor 10 are provided. Reliability with respect to body vibration of the electric vehicle 1 as a power source is improved.

  Further, when the electric vehicle 1 is accelerated or decelerated, acceleration in the vehicle traveling direction acts on the vibration system of the compressor 56. In the in-vehicle structure 100 of the present embodiment, the linear motor movable element 82 of the compressor 56 Since the compressor 56 is mounted on the vehicle so that the reciprocating direction is along the direction orthogonal to the vehicle traveling direction, the vibration due to the acceleration change in the vehicle traveling direction may cause resonance in the vibration system of the compressor 56. Absent.

  Here, even if periodic vibration occurs in the vehicle traveling direction in the electric vehicle 1, the vibration frequency is extremely smaller than the vibration frequency (for example, several tens of hertz) of the linear motor 70 of the compressor 56. Conceivable. Therefore, even if the compressor 56 is mounted so that the moving direction of the linear motor movable element 82 of the linear motor 70 is along the vehicle front-rear direction as will be described later, the linear motor 70 is damaged by resonance due to vibration in the vehicle front-rear direction. There is no fear. Furthermore, centrifugal force (so-called lateral G) in the vehicle width direction acts on the vibration system of the compressor 56 when the electric vehicle 1 turns, and such centrifugal force causes the vibration system of the compressor 56 to resonate. Since it is unlikely to act as such a vibration, it can be ignored in the on-vehicle structure 100 of the compressor.

  Next, an electric vehicle 1a to which the on-vehicle structure 101 of a compressor according to another embodiment is applied will be described with reference to FIG. Here, the same or similar constituent elements as those of the electric vehicle 1 described above are denoted by the same or similar reference numerals, and redundant description will be omitted.

  FIG. 6 shows a schematic configuration of the electric vehicle 1a. In the in-vehicle structure 101 of the compressor in the electric vehicle 1a, the compressor 56 is arranged such that the reciprocating direction of the linear motor movable element 82 of the compressor 56 is parallel to the horizontal direction and the vehicle traveling direction (arrow X direction). It is mounted on the vehicle body 8. The rotor shaft 18 of the superconducting motor 10 is connected to the rear differential gear 6 via a rear drive shaft 9 a connected to the transmission 11. That is, the electric vehicle 1a here is an FR (front engine / rear drive) vehicle, and the front axle 3 connected to the two front wheels 2 is connected to a front differential gear at the front portion of the vehicle (not shown). Yes. The other configuration is the same as that of the electric vehicle 1 described above.

  Thus, even when the compressor 56 is mounted on the vehicle so that the reciprocating direction of the linear motor movable element 82 is along the horizontal direction and parallel to the vehicle traveling direction, the same effects as described above can be obtained. That is, the linear motor 70 can be prevented from being damaged by the vehicle vertical vibration, the compressor 56 using the linear motor 70 as a drive source, the superconducting motor 10 cooled by the refrigerators 16 and 17 including the compressor 56, and The reliability of the electric vehicle 1 using the superconducting motor 10 as a power source is improved with respect to vehicle body vibration. Further, there is no possibility that the linear motor 70 is damaged due to resonance due to vibration in the longitudinal direction of the vehicle.

  Next, a modification of the electric vehicle 1a shown in FIG. 6 will be described with reference to FIG. The electric vehicle 1a is a 4WD vehicle (four-wheel drive vehicle), and a front drive shaft 9b connected to a transmission 11 is connected to a front differential gear 6 '. The other configuration is the same as that of the electric vehicle 1a including the on-vehicle structure 101 of the compressor. The effect similar to the above can also be exhibited by the electric vehicle 1a of this modification.

  When the compressor 56 is mounted on the vehicle such that the reciprocating direction of the linear motor mover 82 of the compressor 56 is in the horizontal direction and parallel to the vehicle traveling direction, as in the on-vehicle structure 101 of the compressor. The behavior characteristics (for example, suspension spring constant, pitch angle, roll rigidity, etc.) of the electric vehicle 1 a may be designed so that vibration in the vehicle longitudinal direction does not cause resonance in the vibration system of the compressor 56.

  1, 1a Electric car, 2 front wheels, 3 front axles, 4 rear wheels, 5 rear axles, 6 rear differential gears, 6 'front differential gear, 7 engine compartment, 8 vehicle body, 9a rear drive shaft, 9b front drive Shaft, 10 superconducting motor, 12 rotor, 14 stator, 16 first refrigerator, 17 second refrigerator, 18 rotor shaft, 19a, 19b end, 20 rotor core, 22 permanent magnet, 24, 26 end plate, 28 Bearing member, 30 stator core, 32 teeth portion, 33 slot, 34 coil, coil portion located in 35 slot, 36 coil end portion, 40 motor case, 42 inner cylinder member, 44 outer cylinder member, 46 first vacuum chamber, 48 Second vacuum chamber, 50 bracket, 52 cylinders, 54 pistons, 55 piston shafts, 56 gas compressors, 58 cooling units, 60 heat transfer members, 70 linear motors, 72 motor housings, 74 housing end faces, 76 openings, 78 motor housing chambers, 80 linear motor stators , 82 Linear motor mover, 84 leaf spring, 86 flexure bearing, 88 piston shaft mounting hole, 90 fixing hole, 92 slit.

Claims (5)

A linear motor including a linear motor stator, and a linear motor including a linear motor movable element that reciprocally moves linearly by a magnetic field generated by the linear motor stator; a piston shaft fixed to the linear motor movable element; and An on-vehicle structure of a compressor provided with a piston that is provided at an end and reciprocates in a cylinder to compress and expand refrigerant gas,
The compressor constitutes a part of a regenerative refrigerator for cooling a coil made of a superconducting wire of a superconducting motor that is a power source of a vehicle from a coil end portion, and the moving direction of the linear motor movable element is a horizontal direction vehicle structure of the compressor, characterized in Rukoto is mounted on a vehicle mounted integrally with the compressor the cold accumulation refrigerator comprising said superconducting motor along the. In the on-vehicle structure of the compressor according to claim 1,
An on-vehicle structure for a compressor, wherein the compressor is mounted on the vehicle so that a moving direction of the linear motor movable element is along a direction orthogonal to a traveling direction of the vehicle. In the on-vehicle structure of the compressor according to claim 1 or 2,
The piston shaft fixed through the linear motor movable element is respectively supported by flexure bearings fixed to the inner wall of the motor housing that accommodates the linear motor on both axial sides of the linear motor movable element. An in-vehicle structure of a compressor characterized by In the on-vehicle structure of the compressor according to any one of claims 1 to 3,
The compressor on-vehicle structure , wherein the refrigerator including the compressor is integrally attached to an end plate located at an axial end of the superconducting motor. In the on-vehicle structure of the compressor according to any one of claims 1 to 3 ,
The compressor on-vehicle structure , wherein the refrigerator including the compressor is integrally mounted on an outer peripheral side wall of a motor case of the superconducting motor.

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