JP4728119B2 - Vehicle suspension system - Google Patents

Description

  The present invention relates to a vehicle suspension device, and in particular, axial displacement of a tube connected to a wheel and rotation of a rotor of a motor provided in a suspension spring are relatively converted via a ball screw nut or the like. The present invention relates to a vehicle suspension system.

Conventionally, various vehicle suspension systems have been proposed in which the axial displacement of a tube connected to a wheel and the rotation of a rotor of a motor provided in a suspension spring are relatively converted via a ball screw nut or the like. Yes.
For example, an axle side tube having a lower suspension spring support provided on the outer periphery is slidably fitted inside or outside the body side tube, and a motor is coupled to the inside or outside of the body side tube so that the axle side tube A ball screw nut that moves integrally with the axle-side tube is provided inside, and a screw shaft that is coupled to the motor shaft directly or via power transmission means in the ball screw nut, or is integrally connected to the motor shaft. The screw shaft is rotatably engaged, and the linear motion of the ball screw nut is converted into the rotational motion of the screw shaft. This rotational motion is transmitted to the motor shaft to generate an electromagnetic force in the motor. There is a vehicle suspension device that uses torque that resists rotation of the motor shaft as a damping force that suppresses linear motion of the axle tube (for example, patent documents 1 reference.).
JP 2004-197817 A (paragraphs (0058) to (0119), FIGS. 1 to 3)

  However, in the vehicle suspension device described in Patent Document 1 described above, the screw shaft is coupled or integrally connected to the tip of the motor shaft that protrudes outward from the motor provided in the suspension spring. There is a problem that the stroke amount of the tube is shortened by the entire length of the motor and it is difficult to reduce the axial size. In addition, since bearing members are provided at the lower end portion of the vehicle body side tube and the upper end portion of the axle side tube, the distance between the bearing members supporting the lateral load is shortened, the load load of each bearing is increased, and smoothness is achieved. There is a problem that it is difficult to obtain smooth sliding and the ride comfort is deteriorated. Furthermore, since it is necessary to support the bending load of the vehicle suspension device with the vehicle body side tube, there is a problem that the vehicle body side tube becomes thicker and the entire body becomes thicker to ensure rigidity.

  Therefore, the present invention was made to solve the above-described problems, and it is possible to increase the stroke amount of the tube connected to the wheel, and it is possible to easily reduce the axial size, In addition, it is possible to increase the distance between the bearings that support the lateral load and improve the ride comfort. Further, it is possible to support the bending load of the vehicle suspension system with the shaft member instead of the vehicle body side tube. An object of the present invention is to provide a vehicle suspension device that can be made thinner.

  In order to achieve the above object, a vehicle suspension device according to claim 1 is provided with a vehicle body mounting member provided with an upper suspension spring receiver and a motor frame disposed below the upper suspension spring receiver and opened downward. A stator provided in an inner peripheral portion of the motor frame, a cylindrical rotor that is rotatably mounted in the motor frame and has a diameter expanded downward, and an inner peripheral surface of the cylindrical hole in the cylindrical hole of the rotor; A shaft member that is coaxially inserted so as to form a predetermined gap and whose upper end is fixed to the rotor and rotates integrally with the rotor, and a shaft member that is slidably fitted to the outside of the shaft member, A tube provided to be able to enter the gap between the member and the rotor and connected to the wheel side; a lower suspension spring receiver provided on an outer periphery of the tube; and the upper suspension spring receiver and the lower suspension spring receiver And the mode is A suspension spring disposed outside of the frame, characterized by comprising a conversion means for axial displacement and a rotation of the rotor relative conversion of the tube.

  The vehicle suspension apparatus according to claim 2 is the vehicle suspension apparatus according to claim 1, wherein the conversion means includes a male screw portion formed on an outer peripheral surface having a predetermined length below the shaft member, and an inner portion of the tube. A ball screw nut fixed to the male screw portion and screwed into the male screw portion, and the axial displacement of the tube and the rotation of the rotor are relatively converted via the ball screw nut and the male screw portion. It is characterized by being.

  The vehicle suspension apparatus according to claim 3 is the vehicle suspension apparatus according to claim 2, wherein the ball screw nut is inserted into the tube from below and the ball screw nut is fixed to the upper end side, and the lower end side is the tube suspension apparatus. It is characterized by having an inner tube that is fixed to the inside.

  A vehicle suspension apparatus according to claim 4 is the vehicle suspension apparatus according to claim 2, wherein a first inner tube is inserted into the tube from below and a lower end side is fixed to the tube; A second inner tube, which is inserted from above and the ball screw nut is fixed to the lower end side, and the upper end side of the ball screw nut is fixed to the tube in a state where the ball screw nut is in contact with the first inner tube; It is provided with.

The vehicle suspension apparatus according to claim 5 is the vehicle suspension apparatus according to claim 1, wherein the conversion means includes a male screw portion formed on an outer peripheral surface having a predetermined length above the tube, and a lower part of the rotor. A tube-like extension part extending a predetermined length from the end surface in a downward direction; and a ball screw nut fixed to a lower end part of the extension part and screwed into the male screw part, and the tube The outer peripheral portion of the tube is slidably brought into contact with the inner peripheral portion of the upper end portion of the tube and the inner peripheral portion of the tube facing the lower end portion of the shaft member . The displacement and the rotation of the rotor are relatively converted through the male screw portion and the ball screw nut.

According to a sixth aspect of the present invention, there is provided a vehicle suspension device including a vehicle body mounting member provided with an upper suspension spring receiver and a motor frame that is disposed below the upper suspension spring receiver and that opens downward. A stator provided in an inner peripheral portion, a cylindrical rotor that is rotatably mounted in the motor frame and opens at both ends in the vertical direction , and an inner peripheral surface of the cylindrical hole and a predetermined gap in the cylindrical hole of the rotor A shaft member that is coaxially inserted so as to form an upper end and an upper end portion of which is fixed to the motor frame, and is slidably fitted to the outside of the shaft member, and enters a gap between the shaft member and the rotor. A tube which is provided and connected to the wheel side, a lower suspension spring receiver provided on the outer periphery of the tube, and interposed between the upper suspension spring receiver and the lower suspension spring receiver and the motor Place outside the frame Includes a suspension spring, a converting means for relatively converting the rotation of the axial displacement of the tube rotor, a being, the shaft member has a predetermined depth were drilled along the axis from the lower end An oil guide hole and a plurality of oil holes that are drilled at a plurality of locations along the axial direction of the outer peripheral surface and communicate with the oil guide hole, and the tube is located below the tube. It has a certain amount of lubricating oil .

  The vehicle suspension apparatus according to claim 7 is the vehicle suspension apparatus according to claim 6, wherein the conversion means includes a male screw portion formed on an outer peripheral surface having a predetermined length above the tube, and a cylinder of the rotor. A ball screw nut fixed in the hole and screwed into the male screw portion of the tube, and the axial displacement of the tube and the rotation of the rotor are via the male screw portion and the ball screw nut. It is characterized by being relatively converted.

  A vehicle suspension device according to claim 8 is the vehicle suspension device according to any one of claims 1 to 7, wherein a plurality of coils wound around one of the stator or the rotor, And a permanent magnet provided at a position facing the other coil of the stator or the rotor.

A vehicle suspension apparatus according to a ninth aspect is the vehicle suspension apparatus according to any one of the first to fifth and eighth aspects, wherein the shaft member is drilled along a shaft center from a lower end portion. An oil guide hole having a predetermined depth, and a plurality of oil holes that are drilled at a plurality of locations along the axial direction of the outer peripheral surface and communicate with the oil guide hole. It has a predetermined amount of lubricating oil below.

  Furthermore, the vehicle suspension apparatus according to claim 10 is the vehicle suspension apparatus according to any one of claims 1 to 9, wherein the vehicle suspension apparatus is fixed to an inner peripheral portion of an upper end portion of the tube and is outer peripheral surface of the shaft member. And a second bearing member fixed to the outer peripheral portion of the lower end portion of the shaft member and contacting the inner peripheral surface of the tube.

In the vehicle suspension apparatus according to claim 1 having the above-described configuration, the tube connected to the wheel side is coaxially inserted in the cylinder of the cylindrical rotor so as to form a predetermined gap with the inner peripheral surface of the cylinder hole. The upper end of the shaft is fixed to the rotor and is slidably fitted to a shaft member that rotates integrally with the rotor, so that it can enter the gap between the shaft member and the rotor. The tube can enter the motor disposed in the suspension spring, the axial stroke amount can be increased, and the axial size can be easily reduced.
Further, the bending load of the vehicle suspension device can be supported by the shaft member whose upper end portion is fixed to the rotor and rotates integrally with the rotor, and the vehicle suspension device can be made thin overall.
In addition, by converting the axial displacement of the tube connected to the wheel side to the rotation of the rotor in the motor frame via the conversion means, it is possible to generate a damping force that suppresses the linear motion of the tube. At the same time, by converting the rotation of the rotor into the axial displacement of the tube via the conversion means, it is possible to make the damping force by the suspension spring variable.

  In the vehicle suspension device according to claim 2, the upper end portion is fixed to the rotor, and a male screw portion is formed on the outer peripheral surface of the lower predetermined length of the shaft member that rotates integrally with the rotor. Since the ball screw nut fixed in the tube is screwed, the axial displacement of the tube connected to the wheel side can be smoothly converted into the rotation of the rotor via the ball screw nut. The rotation of the rotor can be smoothly changed to the axial displacement of the tube via the ball screw nut.

  In the vehicle suspension device according to claim 3, the ball screw nut is inserted into the tube from below and the ball screw nut is fixed to the upper end side, and the inner tube is fixed to the tube at the lower end side. A pipe having a predetermined thickness can be formed, and a simple structure can be obtained.

  In the vehicle suspension system according to the fourth aspect, the first inner tube is inserted into the tube from below, and the lower end side is fixed to the tube. Further, the second inner tube having the ball screw nut fixed to the lower end portion is fixed to the tube with the ball screw nut screwed to the shaft member and in contact with the first inner tube. . As a result, the tube, the first inner tube, and the second inner tube can be configured with pipes having a predetermined thickness, and a simple configuration can be achieved.

In the vehicle suspension device according to the fifth aspect, the external thread portion is formed on the outer peripheral surface having a predetermined length above the tube, and is fixed to the lower end portion of the extension portion extending in the lower direction of the rotor. Since the ball screw nut thus engaged is screwed, the axial displacement of the tube connected to the wheel side can be smoothly converted into the rotation of the rotor via the ball screw nut, and the rotation of the rotor can be reduced. It is possible to smoothly change to the axial displacement of the tube via the ball screw nut. In addition, since the inner peripheral portion of the upper end portion of the tube and the inner peripheral portion facing the lower end portion of the shaft member of the tube are slidably contacted with the shaft member, the vehicle suspension device loaded on the tube The bending load can be supported via a shaft member whose upper end is fixed to the rotor and rotates integrally with the rotor, and the vehicle suspension device can be made thin overall.

In the vehicle suspension apparatus according to claim 6, the tube connected to the wheel side is coaxially inserted into the cylinder of the cylindrical rotor so as to form a predetermined gap with the inner peripheral surface of the cylinder hole, and the upper end The tube is slidably fitted to a shaft member fixed to the motor frame so as to be able to enter the gap between the shaft member and the rotor, so that this tube is disposed in the suspension spring. It becomes possible to enter the motor, and the axial stroke amount can be increased, so that the axial size can be easily reduced.
Further, the bending load of the vehicle suspension device can be supported by the shaft member whose upper end portion is fixed to the motor frame, and the overall thickness can be reduced.
In addition, by converting the axial displacement of the tube connected to the wheel side to the rotation of the rotor in the motor frame via the conversion means, it is possible to generate a damping force that suppresses the linear motion of the tube. At the same time, by converting the rotation of the rotor into the axial displacement of the tube via the conversion means, it is possible to make the damping force by the suspension spring variable. The shaft member is provided with oil guide holes along the axis from the lower end portion, and a plurality of oil holes communicating with the oil guide holes are formed at a plurality of locations along the axial direction of the outer peripheral surface. Therefore, the lubricating oil below the tube flows in the oil guide hole and each oil hole as the tube moves in the axial direction. As a result, a damping force that suppresses the linear motion of the tube is generated by the resistance of the oil guide hole and the lubricating oil flowing through each oil hole, and the riding comfort can be further improved.

  In the vehicle suspension system according to the seventh aspect of the present invention, a male screw portion is formed on the outer peripheral surface having a predetermined length above the tube, and a ball screw nut fixed in the cylindrical hole of the rotor is screwed to the male screw portion. The axial displacement of the tube connected to the wheel side can be smoothly converted into the rotation of the rotor via the ball screw nut, and the rotation of the rotor can be converted to the axis of the tube via the ball screw nut. It becomes possible to change smoothly in the direction displacement.

  In the vehicle suspension device according to the eighth aspect, a plurality of coils are wound around one of the stator and the rotor, and a permanent magnet is provided at a position facing each other coil. It is possible to generate a damping force that suppresses the linear motion of the tube by short-circuiting each coil, and to apply a predetermined voltage to each coil wound around the stator, thereby reducing the damping force of the suspension spring Can be configured to be variable.

  In the vehicle suspension device according to the ninth aspect, the shaft member is provided with an oil guide hole along the shaft center from the lower end portion, and a plurality of oil holes communicating with the oil guide hole are provided on the outer peripheral surface. Therefore, the lubricating oil below the inside of the tube flows through the oil guide hole and each oil hole as the tube moves in the axial direction. As a result, a damping force that suppresses the linear motion of the tube is generated by the resistance of the oil guide hole and the lubricating oil flowing through each oil hole, and the riding comfort can be further improved.

  Furthermore, in the vehicle suspension device according to the tenth aspect, the first bearing member that contacts the outer peripheral surface of the shaft member is fixed to the inner peripheral portion of the upper end portion of the tube, and the second bearing member that contacts the inner peripheral surface of the tube. Since the bearing member is fixed to the outer peripheral portion of the lower end portion of the shaft member, the distance between the first bearing member supporting the lateral load and the second bearing member in the axial direction can be increased, and the ride comfort is improved. Improvements can be made.

  Hereinafter, the vehicle suspension device according to the present invention will be described in detail with reference to the drawings based on the first to sixth embodiments.

  First, a vehicle suspension apparatus according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a diagram illustrating a configuration of a vehicle provided with a vehicle suspension apparatus according to a first embodiment. FIG. 2 is a side sectional view showing the configuration of the vehicle suspension system according to the first embodiment. FIG. 3 is a view showing a state in which the vehicle suspension shown in FIG. 2 is contracted. FIG. 4 is a view showing a state in which the vehicle suspension shown in FIG. 2 is extended.

  As shown in FIG. 1, the vehicle 1 includes a vehicle body 2, a left front wheel 3A, a right front wheel 3B, a left rear wheel 3C, and a right rear wheel 3D. Moreover, each wheel 3A-3D is comprised from the wheel and the rubber tire. The vehicle body 2, the left front wheel 3A, and the right front wheel 3B are connected by the vehicle suspension devices 4 according to the first embodiment. The vehicle body 2, the left rear wheel 3C, and the right rear wheel 3D are connected by respective coil springs 5 and dampers 6, respectively.

Next, the configuration of the vehicle suspension device 4 will be described with reference to FIG.
As shown in FIG. 2, the vehicle suspension device 4 is connected to the vehicle body 2 by bolts 6 with bolts 6 via the vehicle body attachment members 5, and provided on the lower side surface of the tubular tube 8. The axle bracket 9 is connected to the left front wheel 3A or the right front wheel 3B via bolt holes 9A, 9B by bolting, and is configured in a so-called strut shape.

The vehicle body mounting member 5 bolted to the vehicle body 2 by each bolt 6 includes a pair of upper and lower brackets 11 and 12 and rubber that is held by the brackets 11 and 12 and is attached by heat welding or adhesion. The insulator 13 is made of a ring and the upper suspension spring receiver 15 is attached to the insulator 13 by heat welding or adhesion.
Each of the brackets 11 and 12 is formed in a disk shape having a recess on the inner peripheral side so that the insulator 13 can be held, and each bolt 6 for connecting the vehicle body 2 can be inserted in the vicinity of the outer periphery. A plurality of holes are provided.
The upper suspension spring receiver 15 includes a cylindrical portion 16 that is inserted into and fixed to the insulator 13, a flange portion 17 that extends from the peripheral edge of the lower end of the cylindrical portion 16 in a right-angled outward direction, and a flange portion 17. The upper end of the suspension spring 18 is extended from the outer peripheral edge in a diagonally downward direction by a predetermined length, and the spring receiving portion 20 is brought into contact with the dust cover 19 therebetween.

  Further, as shown in FIG. 2, a motor 22 is attached to the lower side of the upper suspension spring receiver 15. The motor 22 includes a motor frame 23 that is fixed to the lower side of the upper suspension spring receiver 15, a rotor member 24 that functions as a rotor that is rotatably mounted in the motor frame 23, and an upper end portion of the motor member 23. A shaft member 25 having a predetermined length that is fixed and rotates integrally with the rotor member 24 is basically constituted.

The motor frame 23 is opened downward, and a cylindrical attachment portion 27 inserted into the cylindrical portion 16 of the upper suspension spring receiver 15 is formed on the upper end surface portion. Further, the axial length of the mounting portion 27 is formed longer than the cylindrical portion 16 of the upper suspension spring receiver 15, a male screw portion is formed at the upper end portion, and a nut 28 is formed on the lower surface of the upper suspension spring receiver 15. It is attached. Further, a stepped portion 30 into which a rolling bearing 29 press-fitted into the upper end outer peripheral portion of the rotor member 24 is inserted from below is formed at the inner peripheral lower end portion of the mounting portion 27.
In addition, a stator 31 formed by laminating and fixing a plurality of electromagnetic steel sheets and the like in the thickness direction is fixed to the inner peripheral portion of the motor frame 23 by press-fitting or bonding, and a plurality of coils 32 are wound. It is disguised.

Further, as shown in FIG. 2, the rotor member 24 that functions as a rotor is positioned so that a predetermined gap 34 into which the tube 8 can enter is formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25. A cylindrical tube having a diameter expanded to the upper end, and a bearing tube portion 33 into which the rolling bearing 29 is press-fitted into the outer peripheral portion is formed at the upper end portion. In addition, a core 24A formed by laminating and fixing a plurality of electromagnetic steel sheets and the like in the thickness direction is fixed to the outer peripheral surface of the rotor member 24 by press-fitting, bonding, or the like. Each permanent magnet 24B is attached to a position facing each coil 32 by adhesion or the like. Further, a stepped portion 35 that is recessed inward is formed on the outer peripheral surface of the lower end portion of the rotor member 24, and a rolling bearing 36 is attached from below by press-fitting or bonding.
The rotor member 24 is configured such that the outer ring portion of the rolling bearing 36 attached to the lower end portion is fitted to the lower end of the motor frame 23 after fitting the bearing tube portion 33 together with the rolling bearing 29 into the attachment portion 27 of the motor frame 23 from below. It is rotatably attached to the motor frame 23 by being supported by a substantially ring-shaped cover member 39 that is bolted to each part by bolts 38.

  Further, the shaft member 25 has a slightly thin stepped portion 41 formed at the upper end. The step portion 41 is inserted into the bearing tube portion 33 of the rotor member 24 from below and is formed so as to protrude a predetermined length outward from the bearing tube portion 33, and the bearing tube of the step portion 41 is formed. A male thread portion is formed at a portion protruding outward from the portion 33. Therefore, the shaft member 25 is rotatably mounted integrally with the rotor member 24 by fitting the stepped portion 41 into the bearing tube portion 33 of the rotor member 24 from below and fixing it with the fixing nut 42. The rotor member 24 is coaxially attached so as to form a predetermined gap 34 with the inner peripheral surface.

Further, the shaft member 25 has a male screw portion 25A formed on the outer peripheral surface of the lower half, and a ball screw nut 45 fixed in the tube 8 is screwed together as will be described later. In addition, a screw hole 47 having a predetermined depth is formed at the lower end portion of the shaft member 25, and a screw 48 is erected at the center portion of the upper end surface so as to have a substantially same outer diameter as the shaft member 25. The member 49 is screwed. A cylindrical metal bearing 51 (second bearing member) is press-fitted and attached to the shaft port member 49 from above, and is configured to be in sliding contact with the inner peripheral surface of the tube 8. The shaft port member 49 is provided with an oil hole 52 communicating from the upper end surface to the lower end surface, and an oil groove 53 reaching the outer peripheral surface from the upper end portion of the oil hole 52 is formed. By screwing 49 into the lower end surface of the shaft member 25, a communication hole that communicates from the outer periphery of the lower end portion of the shaft member 25 to the lower end portion of the tube 8 is formed by the oil hole 52 and the oil groove 53. As a result, a predetermined amount of lubricating oil 55 injected into a lower gap formed between the lower end portion of the tube 8 and the inner peripheral portion of the tube 8 and the shaft member 25 moves up and down with respect to the vehicle body 2 of the tube 8. Thus, the fluid flows in the communication hole formed by the oil hole 52 and the oil groove 53. As a result, the ball screw nut 45 and the metal bearing 51 (second bearing member) can be lubricated. Further, a damping force that suppresses the linear motion of the tube 8 is generated by the resistance of the lubricating oil 55 flowing through the oil hole 52 and the oil groove 53, and it is possible to further improve the riding comfort.
If the lubricating oil 55 is not necessary, the lubricating oil 55 need not be injected into the tube 8.

  On the other hand, the tube 8 connected by bolting to the left front wheel 3A or the right front wheel 3B via the bolt holes 9A, 9B of the axle bracket 9 is substantially cylindrical and has a lower end attached by welding or the like. It is sealed by 8A. Further, the outer diameter of the upper end portion of the tube 8 is formed so as to be able to enter a gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25. For example, in the normal state, the upper end portion of the tube 8 faces the inner peripheral portion of the lower end of the rotor member 24.

  Further, the inner peripheral portion of the tube 8 is formed so that the inner diameter of the upper half in the axial direction is slightly larger than the lower inner diameter so that the ball screw nut 45 can be fitted from the upper end side of the tube 8. A stepped portion 61 is formed at a substantially central portion in the axial direction. The ball screw nut 45 is fixed in the tube 8 with a screw 62 while being in contact with the stepped portion 61, and is screwed into the male screw portion 25 </ b> A of the shaft member 25. Further, a metal bearing 51 provided in a shaft port member 49 screwed into the lower end portion of the shaft member 25 is configured to be in sliding contact with an inner peripheral portion below the tube 8.

  Further, a cylindrical metal bearing 65 (first bearing member) is first press-fitted and attached to the inner peripheral portion near the upper end of the tube 8 so as to be in sliding contact with the outer peripheral surface of the shaft member 25. Has been. In addition, an oil seal 66 is attached to the inner peripheral portion in the vicinity of the upper end portion of the tube 8 by being press-fitted from the upper side above the metal bearing 65, and is configured to be in sliding contact with the outer peripheral surface of the shaft member 25. . Further, a cover 67 in which a through-hole through which the shaft member 25 is inserted is formed at the center portion is fixed to the upper end of the tube 8 by caulking, welding, or the like to prevent mud and dust from entering the tube 8. ing.

  A lower suspension spring receiver 71 is fixed to the outer peripheral surface of the tube 8 by welding or the like. A suspension spring 18 is interposed between the upper suspension spring receiver 15 and the lower suspension spring receiver 71, and the dust cover 19 is held inside the suspension spring 18. It is comprised so that the upper end part of the tube 8 may be located.

Here, the assembly of the vehicle suspension device 4 will be described with reference to FIG.
First, the brackets 11 and 12 are formed in a disk shape having a recess on the inner peripheral side, and the insulators 13 are held by the rackets 11 and 12 and attached by heat welding or adhesion. Then, the cylinder portion 16 of the upper suspension spring receiving portion 15 is inserted into the insulator 13 from below and attached by heat welding, adhesion, or the like, and the vehicle body attachment member 5 is assembled.

  A stator 31 having a plurality of coils 32 wound around the motor frame 23 from below is fixed by press-fitting or bonding. Further, the respective rolling bearings 29 and 36 are attached to the outer peripheral portions of the upper and lower edge portions of the rotor member 24 by press-fitting or bonding. Then, after fitting the rolling bearing 29 of the rotor member 24 into the mounting portion 27 of the motor frame 23 from below, the substantially ring-shaped cover member 39 is brought into contact with the outer ring portion of the rolling bearing 36 attached to the lower end portion. At the same time, the cover member 39 is bolted to the lower end portion of the motor frame 23 by each bolt 38 to constitute the motor 22.

Subsequently, after the ball screw nut 45 is screwed into the shaft member 25, the shaft port member 49 attached by pressing the cylindrical metal bearing 51 (second bearing member) into the lower end portion of the shaft member 25 is screwed. Secure with.
Next, the lower suspension spring support 71 is fixed to the outer peripheral surface of the tube 8 by welding or the like. Then, the ball screw nut 45 and the shaft member 25 are fitted into the tube 8 from the upper end portion, and the ball screw nut 45 is fixed in the tube 8 with the screw 62 while the ball screw nut 45 is in contact with the stepped portion 61. To do. Further, when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after the metal bearing 65 is press-fitted from the upper end portion of the tube 8, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end portion of the tube 8 by caulking or the like.

Thereafter, the mounting portion 27 of the motor 22 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28.
The dust cover 19 is brought into contact with the upper suspension spring receiver 15 from below with the dust cover 19 inserted into the suspension spring 18 from above. Then, the stepped portion 41 of the shaft member 25 inserted into the tube 8 is fitted into the bearing tube portion 33 of the rotor member 24 from below and fixed to the rotor member 24 by the fixing nut 42 to fix the vehicle suspension device 4. assemble.

Next, the operation of the vehicle suspension device 4 configured as described above will be described with reference to FIGS. 3 and 4.
As shown in FIG. 3, when the left front wheel 3 </ b> A or the right front wheel 3 </ b> B approaches the vehicle body 2, the tube 8 is moved upward (in the direction of the arrow 75) via the axle bracket 9, and each metal bearing 51 , 65, and slides upward along the shaft member 25. Further, the upper end portion of the tube 8 enters a gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25 and can move to the vicinity of the inner upper end portion of the rotor member 24. Become. Further, at this time, the lubricating oil 55 injected downward in the tube 8 passes through an oil hole 52 and an oil groove 53 provided in the lower end portion of the shaft member 25, and is connected to the inner peripheral portion of the tube 8 and the shaft member 25. Since it reaches the ball screw nut 45 in the tube 8 from the lower gap formed therebetween, lubricating oil can be supplied to the ball screw nut 45 so that it can be operated smoothly.

  Then, as shown in FIG. 4, when the left front wheel 3A or the right front wheel 3B is separated from the vehicle body 2, the tube 8 is moved downward (in the direction of arrow 76) via the axle bracket 9, and each metal It slides downward along the shaft member 25 via the bearings 51 and 65. Further, the upper end portion of the tube 8 moves to the lower side outside the gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25. Further, at this time, the lubricating oil 55 injected into the lower end portion in the tube 8 and the lower gap formed between the inner peripheral portion of the tube 8 and the shaft member 25 is provided at the lower end portion of the shaft member 25. The oil flows through the oil groove 53 and the oil hole 52 so as to collect at the lower end of the tube 8.

  3 and 4, when the tube 8 moves in the axial direction with respect to the vehicle body 2 in accordance with the movement of the left front wheel 3A or the right front wheel 3B, the tube 8 is fixed in the tube 8. The ball screw nut 45 moves in the axial direction with respect to the shaft member 25. For this reason, the ball of the ball screw nut 45 moves in the axial direction of the shaft member 25. At this time, the ball moves along the spiral screw groove of the male screw portion 25A of the shaft member 25. 25 is rotated, and the rotor member 24 is also rotated together with the shaft member 25. On the other hand, since the motor frame 23 is fixed to the vehicle body 2 via the vehicle body mounting member 5, current due to the induced electromotive force flows through the coils 32 due to the rotation of the rotor member 24. For this reason, when each coil 32 is short-circuited, an electromagnetic force is generated in each coil 32 and a torque against the rotation of the shaft member 25 is generated.

  When each coil 32 of the stator 31 is excited and the rotor member 24 is rotated, the shaft member 25 is rotated integrally. For this reason, since the ball of the ball screw nut 45 screwed into the shaft member 25 moves along the helical screw groove of the male screw portion 25A of the shaft member 25, the ball screw nut 45 is moved in the axial direction. The tube 8 is also moved together with the ball screw nut 45 in the axial direction.

As described above in detail, in the vehicle suspension device 4 according to the first embodiment, the shaft member 25 forms a predetermined gap 34 with the inner peripheral surface of the rotor member 24 in the cylinder of the cylindrical rotor member 24. It is inserted coaxially, and its upper end is fixed to the rotor member 24 so as to rotate integrally with the rotor member 24. The tube 8 connected to the left front wheel 3A or the right front wheel 3B is slidably fitted to the shaft member 25 so as to be able to enter the gap 34 between the shaft member 25 and the rotor member 24. Yes. For this reason, the tube 8 can enter the motor 22 disposed in the suspension spring 18 and the stroke amount in the axial direction can be increased, so that the axial size can be easily reduced. .
Further, the bending load of the vehicle suspension device 4 applied to the metal bearings 51 and 65 is fixed by the shaft member 25 whose upper end portion is fixed to the rotor member 24 by the fixing nut 42 and rotates integrally with the rotor member 24. The vehicle suspension device 4 including the shaft member 25 can be supported and can be made thin overall.

Further, a step portion 41 formed at the upper end portion is fixed to the rotor member 24 by a fixing nut 42 and rotates integrally with the rotor member 24, and a male screw portion 25A is formed on the outer peripheral surface having a predetermined downward length. The axial displacement of the tube 8 connected to the left front wheel 3A or the right front wheel 3B via the axle bracket 9 by the shaft member 25 and a ball screw nut 45 screwed into the male thread portion 25A of the shaft member 25. Since the rotation of the rotor member 24 is relatively converted, a damping force that suppresses the linear motion of the tube 8 is generated by short-circuiting the coils 32 wound around the stator 31 fixed to the motor frame 23. It is possible to make the damping force variable by applying a predetermined voltage to each coil 32 wound around the stator 31. That.
Further, the metal bearing 65 that contacts the outer peripheral surface of the shaft member 25 is fixed to the inner peripheral portion near the upper end portion of the tube 8, and the metal bearing 51 that contacts the inner peripheral surface of the tube 8 is fixed to the shaft member 25. Between the metal bearing 65 supporting the lateral load and the metal bearing 51 in the axial direction because it is fixed to the outer peripheral portion of the shaft port member 49 fixed to the lower end portion of the shaft member, that is, the outer peripheral portion in the vicinity of the lower end portion of the shaft member 25. This makes it possible to increase the distance of the vehicle and improve the ride comfort.

Next, a vehicle suspension apparatus according to a second embodiment will be described with reference to FIG. FIG. 5 is a side sectional view showing the configuration of the vehicle suspension system according to the second embodiment.
In the following description, the same reference numerals as those of the configuration of the vehicle suspension device 4 according to the first embodiment in FIGS. 1 to 4 indicate the same or corresponding parts as the configuration of the vehicle suspension device 4 according to the first embodiment. is there.

The configuration of the vehicle suspension device according to the second embodiment is substantially the same as that of the vehicle suspension device 4 according to the first embodiment.
However, as shown in FIG. 5, the vehicle suspension device 81 according to the second embodiment is configured by a tube 85 formed of a pipe having a uniform predetermined thickness instead of the tube 8 according to the first embodiment. Is different.
The tube 85 connected by bolting to the left front wheel 3A or the right front wheel 3B via the bolt holes 9A and 9B of the axle bracket 9 is a pipe having a uniform predetermined thickness, and its lower end is welded or the like. Sealed by the attached cap 85A. Further, the outer diameter of the upper end portion of the tube 85 is formed so as to be able to enter a gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25. For example, in the normal state, the upper end portion of the tube 85 faces the inner peripheral portion of the lower end of the rotor member 24.

Further, the inner diameter of the tube 85 is formed to be approximately the same as the outer diameter of the ball screw nut 45, and the lower end thereof is sealed by a cap 85A attached by welding or the like. Further, in the substantially lower half of the tube 85, a thin-walled pipe having an outer diameter substantially the same as the outer diameter of the ball screw nut 45 is used instead of the stepped portion 63 of the tube 8 according to the first embodiment. The formed inner tube 86 is inserted, and the lower end portion is fixed to the cap 85A by welding or the like. Further, a lower end portion of a ball screw nut 45 screwed to the male screw portion 25A of the shaft member 25 is fixed to the upper end portion of the inner tube 86 by welding or the like. Further, a metal bearing 51 provided in a shaft port member 49 screwed into the lower end portion of the shaft member 25 is configured to be in sliding contact with the inner peripheral portion of the inner tube 86. A predetermined amount of lubricating oil 55 is injected into the lower end of the tube 85.
Instead of the method of fixing the lower end portion of the inner tube 86 to the cap 85A by welding or the like, the ball screw nut 45 and the inner tube 86 are fitted from the upper end portion of the tube 85 as in the first embodiment, and the inner tube 86 is inserted. The ball screw nut 45 may be fixed in the tube 85 with the screw 62 in a state where the lower end portion of the tube 86 is in contact with the cap 85A.

  Further, a cylindrical metal bearing 65 (first bearing member) is first press-fitted and attached to the inner peripheral portion in the vicinity of the upper end portion of the tube 85 so as to be in sliding contact with the outer peripheral surface of the shaft member 25. Has been. In addition, an oil seal 66 is attached to the inner peripheral portion in the vicinity of the upper end portion of the tube 85 by press-fitting the metal bearing 65 from above, and is configured to be in sliding contact with the outer peripheral surface of the shaft member 25. . Furthermore, a cover 67 having a through-hole through which the shaft member 25 is inserted at the center is fixed to the upper end of the tube 85 by caulking, welding, or the like to prevent mud and dust from entering the tube 85. ing.

  A lower suspension spring receiver 71 is fixed to the outer peripheral surface of the tube 85 by welding or the like. A suspension spring 18 is interposed between the upper suspension spring receiver 15 and the lower suspension spring receiver 71, and the dust cover 19 is held inside the suspension spring 18. It is comprised so that the upper end part of the tube 85 may be located.

Here, the assembly of the vehicle suspension device 81 will be described with reference to FIG.
First, similarly to the vehicle suspension device 4 of the first embodiment, the vehicle body attachment member 5 and the motor 22 are configured. Subsequently, after the ball screw nut 45 and the inner tube 86 are inserted and screwed into the shaft member 25 from below, a cylindrical metal bearing 51 (second bearing member) is press-fitted into the lower end portion of the shaft member 25. The attached shaft port member 49 is screwed and fixed.

  Next, the lower suspension spring support 71 is fixed to the outer peripheral surface of the tube 85 by welding or the like. Then, the ball screw nut 45, the inner tube 86, and the shaft member 25 are fitted into the tube 85 from the lower end portion, and the lower end portion of the inner tube 86 is welded to the cap 85A, and the cap 85A is welded to the lower end portion of the tube 85. To fix and seal. Further, when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after the metal bearing 65 is press-fitted from the upper end portion of the tube 85, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end portion of the tube 85 by caulking or the like.

Thereafter, the mounting portion 27 of the motor 22 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28.
The dust cover 19 is brought into contact with the upper suspension spring receiver 15 from below with the dust cover 19 inserted into the suspension spring 18 from above. Then, the stepped portion 41 of the shaft member 25 inserted into the tube 85 is fitted into the bearing tube portion 33 of the rotor member 24 from below and fixed to the rotor member 24 by the fixing nut 42 to fix the vehicle suspension device 81. assemble.

  Therefore, in the vehicle suspension device 81 according to the second embodiment, in addition to the effects of the vehicle suspension device 4 of the first embodiment, the ball screw nut 45 is fixedly inserted into the tube 85 from below and fixed to the upper end side. By providing the inner tube 86 whose lower end side is fixed to the cap 85A of the tube 85, the tube 85 and the inner tube 86 can be configured with pipes having a predetermined thickness, and a simple configuration can be achieved. Become.

Next, a vehicle suspension apparatus according to a third embodiment will be described with reference to FIG. FIG. 6 is a side sectional view showing the configuration of the vehicle suspension system according to the third embodiment.
In the following description, the same reference numerals as those of the configuration of the vehicle suspension device 4 according to the first embodiment in FIGS. 1 to 4 indicate the same or corresponding parts as the configuration of the vehicle suspension device 4 according to the first embodiment. is there.

The configuration of the vehicle suspension device according to the third embodiment is substantially the same as that of the vehicle suspension device 4 according to the first embodiment.
However, as shown in FIG. 6, the vehicle suspension device 91 according to the third embodiment is configured by a tube 95 formed of a pipe having a uniform predetermined thickness instead of the tube 8 according to the first embodiment. Is different.
A tube 95 connected by bolting to the left front wheel 3A or the right front wheel 3B through the bolt holes 9A, 9B of the axle bracket 9 is a pipe having a uniform predetermined thickness, and its lower end is welded or the like. It is sealed by the attached cap 95A. Further, the outer diameter of the upper end portion of the tube 95 is formed so as to be able to enter a gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 25. For example, in the normal state, the upper end portion of the tube 95 faces the inner peripheral portion of the lower end of the rotor member 24.

The inner diameter of the tube 95 is formed to be approximately the same as the outer diameter of the ball screw nut 45, and the lower end thereof is sealed by a cap 95A attached by welding or the like. Further, in the substantially lower half of the tube 95, a thin-walled pipe having an outer diameter substantially the same as the outer diameter of the ball screw nut 45 is used instead of the stepped portion 63 of the tube 8 according to the first embodiment. The formed lower inner tube (first inner tube) 96 is inserted, and the lower end portion is fixed to the cap 95A by welding or the like. Further, the lower end portion of the ball screw nut 45 screwed into the male screw portion 25 </ b> A of the shaft member 25 is brought into contact with the upper end portion of the lower inner tube 96. Further, an upper inner tube (second inner tube) 97 formed of a thin-walled pipe having an outer diameter substantially the same as the outer diameter of the ball screw nut 45 is welded to the upper end portion of the ball screw nut 45 by welding or the like. It is fixed. Further, a metal bearing 51 provided in a shaft port member 49 screwed into the lower end portion of the shaft member 25 is configured to be in sliding contact with the inner peripheral portion of the lower inner tube 96.
Instead of the method of fixing the lower end portion of the lower inner tube 96 to the cap 95A by welding or the like, the ball screw nut 45 and the upper inner tube 97 are inserted from the upper end portion of the tube 95 after the lower inner tube 96 is inserted. The ball screw nut 45 may be fixed in the tube 95 with the screw 62 in a state where the lower end portion of the lower inner tube 96 is in contact with the cap 95A.

  In addition, a cylindrical metal bearing 65 (first bearing member) is first press-fitted and attached to the inner peripheral portion near the upper end of the tube 95 so as to contact the upper inner tube 97 from above. It is comprised so that it may slidably contact with the outer peripheral surface of 25. An oil seal 66 is press-fitted from above and attached to the inner periphery of the tube 95 near the upper end of the tube 95 so as to be in sliding contact with the outer peripheral surface of the shaft member 25. . Furthermore, a cover 67 having a through hole through which the shaft member 25 is inserted at the center is fixed to the upper end of the tube 95 by caulking, welding, or the like to prevent mud and dust from entering the tube 95. ing.

  A lower suspension spring receiver 71 is fixed to the outer peripheral surface of the tube 95 by welding or the like. A suspension spring 18 is interposed between the upper suspension spring receiver 15 and the lower suspension spring receiver 71, and the dust cover 19 is held inside the suspension spring 18. It is comprised so that the upper end part of the tube 95 may be located.

Here, the assembly of the vehicle suspension device 91 will be described with reference to FIG.
First, similarly to the vehicle suspension device 4 of the first embodiment, the vehicle body attachment member 5 and the motor 22 are configured. Subsequently, after the upper inner tube 97 and the ball screw nut 45 are inserted into the shaft member 25 from below and screwed into the shaft member 25, a cylindrical metal bearing 51 ( The shaft port member 49 to which the second bearing member) is press-fitted is attached and fixed.

  Next, the lower suspension spring support 71 is fixed to the outer peripheral surface of the tube 95 by welding or the like. Then, the shaft member 25 and the lower inner tube 96 are fitted into the tube 95 from the lower end portion, and the lower end portion of the lower inner tube 96 is welded to the cap 95A, and the cap 95A is welded to the lower end portion of the tube 95 or the like. Secure and seal. Further, when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after press-fitting the metal bearing 65 from the upper end of the tube 95 so as to contact the upper inner tube 97, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end of the tube 95 by caulking or the like.

Thereafter, the mounting portion 27 of the motor 22 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28.
The dust cover 19 is brought into contact with the upper suspension spring receiver 15 from below with the dust cover 19 inserted into the suspension spring 18 from above. Then, the stepped portion 41 of the shaft member 25 inserted into the tube 95 is fitted into the bearing tube portion 33 of the rotor member 24 from below and fixed to the rotor member 24 by the fixing nut 42 to fix the vehicle suspension device 91. assemble.

  Therefore, in the vehicle suspension device 91 according to the third embodiment, in addition to the effects of the vehicle suspension device 4 of the first embodiment, the lower inner tube 96 is inserted into the tube 95 from below and the lower end side is fixed to the tube 95. Is done. In addition, the upper inner tube 97 having the ball screw nut 45 fixed to the lower end portion of the upper inner tube 97 is in a state where the ball screw nut 45 is screwed to the shaft member 25 and is in contact with the lower inner tube 96. Fixed. As a result, the tube 95, the lower inner tube 96, and the upper inner tube 97 can be configured with pipes having a predetermined thickness, and a simple configuration can be achieved.

Next, a vehicle suspension apparatus according to a fourth embodiment will be described with reference to FIG. FIG. 7 is a side sectional view showing the configuration of the vehicle suspension system according to the fourth embodiment.
In the following description, the same reference numerals as those of the configuration of the vehicle suspension device 4 according to the first embodiment in FIGS. 1 to 4 indicate the same or corresponding parts as the configuration of the vehicle suspension device 4 according to the first embodiment. is there.

The configuration of the vehicle suspension device according to the fourth embodiment is substantially the same as that of the vehicle suspension device 4 according to the first embodiment.
However, as shown in FIG. 7, the vehicle suspension device 101 according to the fourth embodiment includes a shaft member 105 and a shaft port member 112 instead of the shaft member 25 and the shaft port member 49 according to the first embodiment. Is different.
As with the shaft member 25, the shaft member 105 has a slightly thin stepped portion 41 at the upper end. Therefore, the shaft member 105 is rotatably mounted integrally with the rotor member 24 by fitting the stepped portion 41 into the bearing cylinder portion 33 of the rotor member 24 from below and fixing the step member 41 with the fixing nut 42. The rotor member 24 is coaxially attached so as to form a predetermined gap 34 with the inner peripheral surface.

As with the shaft member 25, the shaft member 105 has a male screw portion 25 A formed on the outer peripheral surface of the lower half, and a ball screw nut 45 fixed in the tube 8 is screwed into the shaft member 105. Further, an oil guide hole 106 having a predetermined inner diameter is formed on the shaft center of the shaft member 105 so as to reach a portion above the male screw portion 25A from the lower end portion. Further, a plurality of oil holes 107 communicating with the oil guide hole 106 are formed at substantially equal intervals along the axial direction on the outer peripheral surface of the male screw portion 25A of the shaft member 105.
Further, a female screw portion 108 having a predetermined depth is formed at the lower end portion of the oil guide hole 106, and a screw 111 is erected at the center portion of the upper end surface so as to have a substantially same outer diameter as the shaft member 105. The member 112 is screwed. Further, the shaft port member 112 is formed with a through hole 113 that communicates from the lower end surface to the upper end surface of the screw 111 on the shaft center, and a communication hole that communicates from the oil guide hole 106 to the lower end portion of the tube 8 is formed. Has been. A cylindrical metal bearing 51 (second bearing member) is press-fitted and attached to the shaft port member 112 from above, and is configured to be in sliding contact with the inner peripheral surface of the tube 8.

  As a result, a predetermined amount of lubricating oil 55 injected into a lower gap formed between the lower end portion of the tube 8 and the inner peripheral portion of the tube 8 and the shaft member 105 moves up and down with respect to the vehicle body 2 of the tube 8. As a result, the fluid flows in the communication hole formed by the through hole 113, the oil guide hole 106, and each oil hole 107. If the lubricating oil 55 is not necessary, the lubricating oil 55 need not be injected into the tube 8.

Here, the assembly of the vehicle suspension apparatus 101 will be described with reference to FIG.
First, similarly to the vehicle suspension device 4 of the first embodiment, the vehicle body attachment member 5 and the motor 22 are configured. Subsequently, after the ball screw nut 45 is screwed into the shaft member 105, the shaft port member 112 to which the cylindrical metal bearing 51 (second bearing member) is press-fitted and attached to the lower end portion of the shaft member 105 is screwed. Secure with.
Next, the lower suspension spring support 71 is fixed to the outer peripheral surface of the tube 8 by welding or the like. Then, the ball screw nut 45 and the shaft member 105 are fitted into the tube 8 from the upper end portion, and the ball screw nut 45 is fixed in the tube 8 with the screw 62 while the ball screw nut 45 is in contact with the stepped portion 61. To do. Further, when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after the metal bearing 65 is press-fitted from the upper end portion of the tube 8, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end portion of the tube 8 by caulking or the like.

  Thereafter, the mounting portion 27 of the motor 22 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28. The dust cover 19 is brought into contact with the upper suspension spring receiver 15 from below with the dust cover 19 inserted into the suspension spring 18 from above. Then, the stepped portion 41 of the shaft member 105 inserted into the tube 8 is fitted into the bearing tube portion 33 of the rotor member 24 from below and fixed to the rotor member 24 by the fixing nut 42 to fix the vehicle suspension device 101. assemble.

  Therefore, in the vehicle suspension device 101 according to the fourth embodiment, in addition to the effects of the vehicle suspension device 4 according to the first embodiment, the male screw portion 25A of the shaft member 105 extends from the lower end portion of the shaft member 105 along the shaft center. Since a plurality of oil holes 107 communicating with the oil guide holes 106 formed in this manner are formed at a plurality of locations along the axial direction of the outer peripheral surface of the male screw portion 25A, lubrication located below the tube 8 is performed. As the tube 8 moves in the axial direction, the oil 55 passes through the oil guide hole 106 and each oil hole 107 and is sent to the outer peripheral surface of the male screw portion 25A, so that the ball screw nut 45 moves more smoothly in the vertical direction. In addition, a damping force that suppresses the linear motion of the tube 8 is generated by the resistance of the lubricating oil 55 flowing through the oil guide hole 106 and each oil hole 107, so that it is possible to further improve riding comfort.

Next, a vehicle suspension apparatus according to a fifth embodiment will be described with reference to FIGS. FIG. 8 is a side sectional view showing the configuration of the vehicle suspension system according to the fifth embodiment. FIG. 9 is a view showing a state in which the vehicle suspension shown in FIG. 8 is contracted. FIG. 10 is a view showing a state in which the vehicle suspension shown in FIG. 8 is extended.
In the following description, the same reference numerals as those of the configuration of the vehicle suspension device 4 according to the first embodiment in FIGS. 1 to 4 indicate the same or corresponding parts as those of the vehicle suspension device 4 according to the first embodiment. It is.

The configuration of the vehicle suspension apparatus according to the fifth embodiment is similar to that of the vehicle suspension apparatus 4 according to the first embodiment.
However, as shown in FIG. 8, the vehicle suspension device 121 according to the fifth embodiment includes a cylindrical extension portion 123 in which a ball screw nut 145 extends a predetermined length downward from the lower end surface of the rotor member 24. This is different in that it is fixed to the inner peripheral portion of the lower end of the tube 158 by a screw 146 and screwed into a male screw portion 159 formed on the outer peripheral surface of the substantially upper half of the tube 158.

Hereinafter, the configuration of the vehicle suspension device 121 will be described with reference to FIG.
As shown in FIG. 8, the vehicle suspension device 121 is connected to the vehicle body 2 by bolts 6 with the bolts 6 via the vehicle body attachment members 5, and provided on the lower side surface of the tubular tube 158. The axle bracket 9 is connected to the left front wheel 3A or the right front wheel 3B via bolt holes 9A, 9B by bolting, and is configured in a so-called strut shape.

  A motor 122 is attached to the lower side of the upper suspension spring receiver 15. The motor 122 has substantially the same configuration as the motor 22 according to the first embodiment, and functions as a motor frame 23 that is fixed to the lower side of the upper suspension spring receiver 15 and a rotor that is rotatably mounted in the motor frame 23. The rotor member 24 and the shaft member 151 having a predetermined length that is fixed to the rotor member 24 and rotates integrally with the rotor member 24 are basically configured.

  Further, a cylindrical extending portion 123 extending from the lower end surface of the rotor member 24 to a lower side by a predetermined length is provided. Further, the inner peripheral portion of the lower end of the extension portion 123 is formed to be slightly larger than the inner diameter of the upper side so that the ball screw nut 145 can be fitted from the lower end side, and the step portion 125 is formed. Yes. Then, the ball screw nut 145 is fixed in the extension portion 123 of the rotor member 24 by the screw 146 in a state in which the ball screw nut 145 is in contact with the stepped portion 125, and is formed on the outer peripheral surface of the upper half of the tube 158. 159 is screwed.

  The rotor member 24 is configured such that the outer ring portion of the rolling bearing 36 attached to the lower end portion is fitted to the lower end of the motor frame 23 after fitting the bearing tube portion 33 together with the rolling bearing 29 into the attachment portion 27 of the motor frame 23 from below. It is rotatably attached to the motor frame 23 by being supported by a substantially ring-shaped cover member 39 that is bolted to each part by bolts 38.

The shaft member 151 has substantially the same configuration as the shaft member 25 according to the first embodiment, but is different in that the male screw portion 25A is not provided on the outer peripheral surface. Therefore, the shaft member 151 is rotatably mounted integrally with the rotor member 24 by fitting the stepped portion 41 into the bearing tube portion 33 of the rotor member 24 from below and fixing it with the fixing nut 42. The rotor member 24 is coaxially attached so as to form a predetermined gap 34 with the inner peripheral surface of the rotor member 24.
Further, a screw hole 47 having a predetermined depth is formed at the lower end of the shaft member 151, and the shaft port member 49 according to the first embodiment is screwed. Thus, the cylindrical metal bearing 51 (second bearing member) that is press-fitted and attached to the shaft port member 49 from above is configured to be in sliding contact with the inner peripheral surface of the tube 158. Further, a predetermined amount of lubricating oil 55 injected into the lower end portion of the tube 158 and the lower gap formed between the inner peripheral portion of the tube 158 and the shaft member 151 is caused by the vertical movement of the tube 158 relative to the vehicle body 2. Since the oil hole 52 and the oil groove 53 flow through the communication hole, a damping force that suppresses the linear motion of the tube 158 is generated by the resistance of the lubricating oil 55, thereby further improving riding comfort. It becomes possible.
If the lubricating oil 55 is not necessary, the lubricating oil 55 need not be injected into the tube 158.

  On the other hand, the tube 158 connected by bolting to the left front wheel 3A or the right front wheel 3B via the bolt holes 9A and 9B of the axle bracket 9 is a pipe having a uniform predetermined thickness, and its lower end is welded or the like. It is sealed by a cap 158A attached by. Further, the outer diameter of the upper end portion of the tube 158 is formed so as to be able to enter a gap 34 formed by the inner peripheral portion of the rotor member 24 and the outer peripheral surface of the shaft member 151. For example, in a normal state, the upper end portion of the tube 158 faces the lower end inner peripheral portion of the rotor member 24, that is, the upper end inner peripheral portion of the extending portion 123.

A male screw portion 159 is formed on the outer peripheral surface of the upper half of the tube 158 and is screwed into a ball screw nut 145 fixed in the extension portion 123 of the rotor member 24.
In addition, a cylindrical metal bearing 65 (first bearing member) is first press-fitted and attached to the inner peripheral portion in the vicinity of the upper end portion of the tube 158 so as to be in sliding contact with the outer peripheral surface of the shaft member 151. Has been. In addition, an oil seal 66 is attached to the inner peripheral portion near the upper end portion of the tube 158 by being press-fitted from above to the upper side of the metal bearing 65, and is configured to be in sliding contact with the outer peripheral surface of the shaft member 151. . Further, a cover 67 in which a through hole through which the shaft member 151 is inserted is formed at the center portion is fixed to the upper end of the tube 158 by caulking, welding, or the like to prevent intrusion of mud or dust into the tube 158. ing.

  A lower suspension spring receiver 71 is fixed to the lower outer peripheral surface of the male threaded portion 159 of the tube 158 by welding or the like. A suspension spring 18 is interposed between the upper suspension spring receiver 15 and the lower suspension spring receiver 71. In addition, a dust cover 161 is attached to the outer peripheral surface of the lower end of the motor frame 23 by adhesion, screwing, or the like to prevent intrusion of mud, dust or the like into the ball screw nut 145 or the male screw portion 159 of the tube 158.

Here, the assembly of the vehicle suspension device 121 will be described with reference to FIG.
First, the vehicle body attachment member 5 is assembled in the same manner as in the first embodiment.

A stator 31 having a plurality of coils 32 wound around the motor frame 23 from below is fixed by press-fitting or bonding.
Further, the respective rolling bearings 29 and 36 are attached to the outer peripheral portions of the upper and lower edge portions of the rotor member 24 by press-fitting or bonding.
Then, after fitting the rolling bearing 29 of the rotor member 24 into the mounting portion 27 of the motor frame 23 from below, the substantially ring-shaped cover member 39 is brought into contact with the outer ring portion of the rolling bearing 36 attached to the lower end portion. At the same time, the cover member 39 is bolted to the lower end portion of the motor frame 23 with each bolt 38. Thereafter, a ball screw nut 145 is fitted into the extended portion 123 of the rotor member 24 from the lower end, and is fixed by a screw 146 to constitute the motor 122. Then, the dust cover 161 is attached to the outer peripheral surface of the lower end of the motor frame 23 by bonding or screwing.

Subsequently, the shaft port member 49 to which the cylindrical metal bearing 51 (second bearing member) is press-fitted and attached to the lower end portion of the shaft member 151 is screwed and fixed.
Next, the lower suspension spring receiver 71 is fixed to the lower outer peripheral surface of the male thread portion 159 of the tube 158 by welding or the like. Then, the shaft member 151 is fitted into the tube 158 from the upper end, and when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after the metal bearing 65 is press-fitted from the upper end portion of the tube 158, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end portion of the tube 158 by caulking or the like.

Thereafter, the mounting portion 27 of the motor 22 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28.
Then, the suspension spring 18 is brought into contact with the upper suspension spring receiver 15 from below. Subsequently, in a state where the male screw portion 159 of the tube 158 is inserted into the ball screw nut 145 from below and screwed, the step portion 41 of the shaft member 151 inserted into the tube 158 is replaced with the bearing cylinder of the rotor member 24. The vehicle suspension device 121 is assembled by being fitted into the portion 33 from below and fixed to the rotor member 24 by the fixing nut 42.

Next, the action | operation of the vehicle suspension apparatus 121 comprised in this way is demonstrated based on FIG.9 and FIG.10.
As shown in FIG. 9, when the left front wheel 3 </ b> A or the right front wheel 3 </ b> B approaches the vehicle body 2, the tube 158 is moved upward (in the direction of the arrow 165) via the axle bracket 9, and each metal bearing 51 , 65 and slides upward along the shaft member 151. The upper end portion of the tube 158 enters a gap 134 formed by the inner peripheral portion of the rotor member 24 and the extending portion 123 and the outer peripheral surface of the shaft member 151, and is near the inner upper end portion of the rotor member 24. Until it becomes movable. At this time, the lubricating oil 55 injected into the lower portion of the tube 158 passes through an oil hole 52 and an oil groove 53 provided in the lower end portion of the shaft member 151, and then is connected between the inner peripheral portion of the tube 158 and the shaft member 151. It flows into the gap formed between them.

  Then, as shown in FIG. 10, when the left front wheel 3A or the right front wheel 3B is separated from the vehicle body 2, the tube 158 is moved downward (in the direction of the arrow 166) via the axle bracket 9, and each metal It slides downward along the shaft member 151 via the bearings 51 and 65. Further, the upper end portion of the tube 158 moves downward in a gap 134 formed by the inner peripheral portion of the rotor member 24 and the extending portion 123 and the outer peripheral surface of the shaft member 151, so that the upper end portion of the ball bearing nut 145 It will be located in the vicinity. At this time, the lubricating oil 55 that has flowed into the gap formed between the inner periphery of the tube 158 and the shaft member 151 passes through the oil groove 53 and the oil hole 52 provided at the lower end of the shaft member 151, It flows so as to collect at the lower end of the tube 158.

  Further, as shown in FIGS. 9 and 10, when the tube 158 moves in the axial direction with respect to the vehicle body 2 in accordance with the movement of the left front wheel 3A or the right front wheel 3B, it is screwed into the ball screw nut 145. The male threaded portion 159 of the tube 158 moves in the axial direction with respect to the ball screw nut 145. For this reason, the ball of the ball screw nut 145 moves in the axial direction of the tube 158. At this time, since the ball moves along the helical screw groove of the male screw portion 159 of the tube 158, the ball screw nut 145 Is rotated, and the rotor member 24 is also rotated integrally with the ball screw nut 145. On the other hand, since the motor frame 23 is fixed to the vehicle body 2 via the vehicle body mounting member 5, current due to the induced electromotive force flows through the coils 32 due to the rotation of the rotor member 24. For this reason, when each coil 32 is short-circuited, an electromagnetic force is generated in each coil 32 and a torque against the rotation of the rotor member 24 is generated.

  In addition, when each coil 32 of the stator 31 is excited and the rotor member 24 is rotated, the ball screw nut 145 attached to the lower end of the extending portion 123 of the rotor member 24 rotates integrally. For this reason, since the ball of the ball screw nut 145 moves along the spiral screw groove of the male screw portion 159 of the tube 158, the tube 158 is moved in the axial direction.

As described above in detail, in the vehicle suspension device 121 according to the fifth embodiment, the shaft member 151 is formed by the cylindrical rotor member 24 and the extending portion 123 that extends downward from the rotor member 24. The upper end portion of the rotor member 24 is fixed to the rotor member 24 so as to form a predetermined gap 134 with the inner peripheral surface of the rotor member 24 and the extension portion 123, and the rotor member 24. It is provided to rotate integrally. The tube 158 connected to the left front wheel 3A or the right front wheel 3B is slidably fitted to the shaft member 151 so as to be able to enter the gap 134 between the shaft member 151 and the rotor member 24. Yes. For this reason, the tube 158 can enter the motor 122 disposed in the suspension spring 18 and the stroke amount in the axial direction can be increased, so that the axial size can be easily reduced. .
Further, a bending load of the vehicle suspension device 121 can be supported by a shaft member 151 whose upper end portion is fixed to the rotor member 24 and rotates integrally with the rotor member 24, and the vehicle suspension device 121 including the shaft member 151 is supported. Can be made thin overall.

A ball screw nut 145 fixed to the lower end portion of the extending portion 123 extending in the lower direction of the rotor member 24 is a tube 158 connected to the left front wheel 3A or the right front wheel 3B via the axle bracket 9. Since the axial displacement of the tube 158 and the rotation of the rotor member 24 are relatively converted by being screwed into the male threaded portion 159 formed on the outer peripheral surface of the substantially upper half of the shaft, it is fixed to the motor frame 23. By short-circuiting each coil 32 wound around the stator 31, it becomes possible to generate a damping force that suppresses the linear motion of the tube 158, and a predetermined voltage is applied to each coil 32 wound around the stator 31. It is possible to make the damping force variable by applying.
Further, the metal bearing 65 that contacts the outer peripheral surface of the shaft member 151 is fixed to the inner peripheral portion near the upper end portion of the tube 158, and the metal bearing 51 that contacts the inner peripheral surface of the tube 158 is fixed to the shaft member 151. Therefore, it is possible to increase the distance between the metal bearings 65 and the metal bearings 51 supporting the lateral load in the axial direction, thereby improving the riding comfort.

Next, a vehicle suspension apparatus according to a sixth embodiment will be described with reference to FIGS. FIG. 11 is a side sectional view showing the configuration of the vehicle suspension system according to the sixth embodiment. FIG. 12 is a view showing a state where the vehicle suspension shown in FIG. 11 is contracted. FIG. 13 is a view showing a state in which the vehicle suspension shown in FIG. 11 is extended.
In the following description, the same reference numerals as those of the configuration of the vehicle suspension device 4 according to the first embodiment in FIGS. 1 to 4 indicate the same or corresponding parts as those of the vehicle suspension device 4 according to the first embodiment. It is. Further, the same reference numerals as those of the configuration of the vehicle suspension 121 according to the fifth embodiment in FIGS. 8 to 10 indicate the same or corresponding parts as the configuration of the vehicle suspension 121 according to the fifth embodiment.

The configuration of the vehicle suspension apparatus according to the sixth embodiment is similar to that of the vehicle suspension apparatus 121 according to the fifth embodiment.
However, as shown in FIG. 11, in the vehicle suspension device 201 according to the sixth embodiment, the ball screw nut 245 is fixed to the inner peripheral portion of the rotor member 224 and formed on the outer peripheral surface of the substantially upper half of the tube 158. The difference is that the male thread portion 159 is configured to be screwed. Further, the shaft member 151 is different in that it is fixed to the motor frame 223.

Hereinafter, the structure of the vehicle suspension apparatus 201 will be described with reference to FIG.
As shown in FIG. 11, the vehicle suspension device 201 is connected to the vehicle body 2 by bolts 6 with the bolts 6 via the vehicle body attachment members 5, and is provided on the lower side surface of the tubular tube 158. The axle bracket 9 is connected to the left front wheel 3A or the right front wheel 3B via bolt holes 9A, 9B by bolting, and is configured in a so-called strut shape.

  A motor 222 is attached to the lower side of the upper suspension spring receiver 15. The motor 222 includes a motor frame 223 that is fixed to the lower side of the upper suspension spring receiver 15, a rotor member 224 that functions as a rotor that is rotatably mounted in the motor frame 223, and an inner peripheral portion of the rotor member 224. The ball screw nut 245 is fixed to the motor frame 223 and the shaft member 251 having a predetermined length is fixed to the motor frame 223.

The motor frame 223 is formed in a long cylindrical shape and is opened downward, and a cylindrical mounting portion 27 inserted into the cylindrical portion 16 of the upper suspension spring receiver 15 is formed on the upper end surface portion. Further, the axial length of the mounting portion 27 is formed longer than the cylindrical portion 16 of the upper suspension spring receiver 15, a male screw portion is formed at the upper end portion, and a nut 28 is formed on the lower surface of the upper suspension spring receiver 15. It is attached. A rubber ring-shaped insulator 206 having a through-hole 205 formed at the center is attached to a substantially central portion in the vertical direction of the attachment 27 by heat welding or adhesion.
Further, a stator 31 formed by laminating and fixing a plurality of electromagnetic steel plates and the like in the thickness direction is fixed to the inner peripheral portion on the lower end side of the motor frame 223 by press-fitting, bonding, or the like. Is wound. In addition, an outer ring portion of the rolling bearing 229 is press-fitted into the stepped portion 208 and fixed to the inner peripheral portion on the upper side of the stator 31.

  Further, the rotor member 224 functioning as a rotor has a cylindrical shape, and a snap ring is attached to a position facing the lower end edge of the inner ring portion of the rolling bearing 229, and is attached to the lower end surface of the inner ring portion of the rolling bearing 229. It is in contact. A core 24A formed by laminating and fixing a plurality of electromagnetic steel sheets and the like in the thickness direction is fixed to the outer peripheral surface of the rotor member 224 by press-fitting, bonding, or the like. Each permanent magnet 24B is attached to a position facing each coil 32 by adhesion or the like. In addition, a stepped portion 35 that is recessed inward is formed on the outer peripheral surface of the lower end portion of the rotor member 224, and a rolling bearing 36 is attached from below by press-fitting or bonding. In addition, a ball screw nut 245 is fixed to the axially central portion of the inner peripheral portion of the rotor member 224 by press-fitting or bonding, and is screwed into a male screw portion 159 formed on the outer peripheral surface of the upper half of the tube 158. ing.

  The rotor member 224 supports the outer ring portion of the rolling bearing 36 attached to the lower end portion by a substantially ring-shaped cover member 39 that is bolted to the lower end portion of the motor frame 223 by each bolt 38. It is rotatably attached to the motor frame 223 via the respective rolling bearings 229 and 36.

In addition, the shaft member 251 has substantially the same configuration as the shaft member 151 according to the fifth embodiment, but instead of the step portion 41, the through-hole 205 of the insulator 206 provided in the upper end portion of the motor frame 223 is viewed from below. A slightly thin stepped portion 241 that is inserted and formed so as to protrude a predetermined length outward from the insulator 206 is provided. In addition, the stepped portion 241 has a male screw portion formed at a portion protruding outward from the insulator 206. Therefore, the shaft member 251 is inserted into the through hole 205 of the insulator 206 provided at the upper end of the motor frame 223 from below, and is then fixed by the fixing nut 42 so that the motor frame 223 and the rotor member 224 are fixed. Are attached coaxially so as to form a predetermined gap 234. Further, the vibration of the shaft member 251 is attenuated by the insulator 206.
A screw hole 47 having a predetermined depth is formed at the lower end of the shaft member 251 and the shaft port member 49 according to the first embodiment is screwed. Thus, the cylindrical metal bearing 51 (second bearing member) that is press-fitted and attached to the shaft port member 49 from above is configured to be in sliding contact with the inner peripheral surface of the tube 158. In addition, a predetermined amount of lubricating oil 55 injected into a lower gap formed between the lower end portion of the tube 158 and the inner peripheral portion of the tube 158 and the shaft member 251 is caused by the vertical movement of the tube 158 relative to the vehicle body 2. Since the oil hole 52 and the oil groove 53 flow through the communication hole, a damping force that suppresses the linear motion of the tube 158 is generated by the resistance of the lubricating oil 55, thereby further improving riding comfort. It becomes possible.
If the lubricating oil 55 is not necessary, the lubricating oil 55 need not be injected into the tube 158.

  On the other hand, the tube 158 connected by bolting to the left front wheel 3A or the right front wheel 3B via the bolt holes 9A and 9B of the axle bracket 9 is a pipe having a uniform predetermined thickness, and its lower end is welded or the like. It is sealed by a cap 158A attached by. Further, the outer diameter of the upper end portion of the tube 158 is formed so as to be able to enter a gap 234 formed by the inner peripheral portion of the rotor member 224 and the outer peripheral surface of the shaft member 251. For example, in the normal state, the upper end portion of the tube 158 faces the substantially central portion in the axial direction of the inner peripheral portion of the motor frame 223.

A male screw portion 159 is formed on the outer peripheral surface of the upper half of the tube 158 and is screwed into a ball screw nut 245 fixed in the rotor member 224.
In addition, a cylindrical metal bearing 65 (first bearing member) is first press-fitted and attached to the inner peripheral portion in the vicinity of the upper end portion of the tube 158 so as to be in sliding contact with the outer peripheral surface of the shaft member 251. Has been. In addition, an oil seal 66 is attached to the inner peripheral portion near the upper end portion of the tube 158 by being press-fitted from above to the upper side of the metal bearing 65, and is configured to be in sliding contact with the outer peripheral surface of the shaft member 251. . Further, a cover 67 in which a through hole through which the shaft member 251 is inserted is fixed at the upper end of the tube 158 is fixed by caulking, welding, or the like to prevent mud and dust from entering the tube 158. ing.

  A lower suspension spring receiver 71 is fixed to the lower outer peripheral surface of the male threaded portion 159 of the tube 158 by welding or the like. A suspension spring 18 is interposed between the upper suspension spring receiver 15 and the lower suspension spring receiver 71, and the dust cover 19 is held inside the suspension spring 18, and a motor 222 is installed inside the dust cover 19. It is configured so as to prevent mud and dust from entering the ball screw nut 245 and the male screw portion 159 of the tube 158.

Here, the assembly of the vehicle suspension device 201 will be described with reference to FIG.
First, the vehicle body attachment member 5 is assembled in the same manner as in the first embodiment.

Further, after the rolling bearing 229 is press-fitted into the motor frame 223 from below, the stator 31 around which a plurality of coils 32 are wound is fixed by press-fitting or bonding.
Further, a ball screw nut 245 is fixed to the central portion in the axial direction of the inner peripheral portion of the rotor member 224 by press-fitting or bonding. Then, the rolling bearing 36 is attached to the outer peripheral portion of the lower end edge portion of the rotor member 224 by press-fitting or bonding. Further, the snap ring 230 is attached to the outer periphery of the upper end of the rotor member 224.
Then, after inserting the rotor member 224 into the motor frame 223 from below, the substantially ring-shaped cover member 39 is brought into contact with the outer ring portion of the rolling bearing 36 attached to the lower end portion, and the cover member 39 is moved to the motor. The motor 222 is configured by bolting to the lower end portion of the frame 223 with each bolt 38.

Subsequently, the shaft port member 49 to which the cylindrical metal bearing 51 (second bearing member) is press-fitted and attached to the lower end portion of the shaft member 251 is screwed and fixed.
Next, the lower suspension spring receiver 71 is fixed to the lower outer peripheral surface of the male thread portion 159 of the tube 158 by welding or the like. Then, the shaft member 251 is fitted into the tube 158 from the upper end, and when the lubricating oil 55 is necessary, a predetermined amount of the lubricating oil 55 is injected. Subsequently, after the metal bearing 65 is press-fitted from the upper end portion of the tube 158, the oil seal 66 is press-fitted, and then the cover 67 is fixed to the upper end portion of the tube 158 by caulking or the like.

Thereafter, the mounting portion 27 of the motor 222 is inserted into the vehicle body mounting member 5 from below and fixed by the nut 28.
The dust cover 19 is brought into contact with the upper suspension spring receiver 15 from below with the dust cover 19 inserted into the suspension spring 18 from above. Then, with the male threaded portion 159 of the tube 158 inserted into the ball screw nut 245 from below and screwed together, the stepped portion 241 of the shaft member 251 inserted into the tube 158 is connected to the upper end portion of the motor frame 223. The vehicle suspension device 201 is assembled by being fitted into the through hole 205 of the insulator 206 to be formed and fixed to the motor frame 223 by the fixing nut 42.

Next, the operation of the vehicle suspension apparatus 201 configured as described above will be described with reference to FIGS.
As shown in FIG. 12, when the left front wheel 3 </ b> A or the right front wheel 3 </ b> B approaches the vehicle body 2, the tube 158 is moved upward (in the direction of the arrow 265) via the axle bracket 9, and each metal bearing 51 , 65, and slides upward along the shaft member 251. Further, the upper end portion of the tube 158 enters a gap 234 formed by the inner peripheral portion of the motor frame 223 and the rotor member 224 and the outer peripheral surface of the shaft member 251, and reaches the vicinity of the inner upper end portion of the motor frame 223. , Moveable. At this time, the lubricating oil 55 injected into the lower portion of the tube 158 passes through the oil hole 52 and the oil groove 53 provided at the lower end portion of the shaft member 251, and is connected to the inner peripheral portion of the tube 158 and the shaft member 251. It flows into the gap formed between them.

  Then, as shown in FIG. 13, when the left front wheel 3A or the right front wheel 3B is separated from the vehicle body 2, the tube 158 is moved downward (in the direction of the arrow 266) via the axle bracket 9, and each metal It slides downward along the shaft member 251 via the bearings 51 and 65. Further, the upper end portion of the tube 158 moves downward in a gap 234 formed by the inner peripheral portion of the motor frame 223 and the rotor member 224 and the outer peripheral surface of the shaft member 251, and is near the upper end portion of the rotor member 224. Will be located. At this time, the lubricating oil 55 that has flowed into the gap formed between the inner periphery of the tube 158 and the shaft member 251 passes through the oil groove 53 and the oil hole 52 provided at the lower end of the shaft member 251, It flows so as to collect at the lower end of the tube 158.

  Further, as shown in FIGS. 12 and 13, when the tube 158 moves in the axial direction with respect to the vehicle body 2 in accordance with the movement of the left front wheel 3A or the right front wheel 3B, it is screwed into the ball screw nut 245. The male screw portion 159 of the tube 158 moves in the axial direction with respect to the ball screw nut 245. For this reason, the ball of the ball screw nut 245 moves in the axial direction of the tube 158. At this time, since the ball moves along the helical screw groove of the male screw portion 159 of the tube 158, the ball screw nut 245 is moved. Is rotated, and the rotor member 224 is also rotated integrally with the ball screw nut 245. On the other hand, since the motor frame 223 and the shaft member 251 are fixed to the vehicle body 2 via the vehicle body mounting member 5, the current caused by the induced electromotive force is generated in each coil 32 by the rotation of the rotor member 224. Flowing. For this reason, when each coil 32 is short-circuited, an electromagnetic force is generated in each coil 32, and a torque against the rotation of the rotor member 224 is generated.

  When each coil 32 of the stator 31 is excited and the rotor member 224 is rotated, the ball screw nut 245 attached to the rotor member 224 rotates integrally. For this reason, since the ball of the ball screw nut 245 moves along the spiral screw groove of the male screw portion 159 of the tube 158, the tube 158 is moved in the axial direction.

As described in detail above, in the vehicle suspension device 201 according to the sixth embodiment, the shaft member 251 is a gap formed by the inner peripheral portion of the cylindrical motor frame 223 and the rotor member 224 and the outer peripheral surface of the shaft member 251. The upper end portion of the motor frame 223 is fixed to the upper end portion of the motor frame 223. The tube 158 connected to the left front wheel 3A or the right front wheel 3B is slidably fitted to the shaft member 251 and can enter the gap 234 between the shaft member 251 and the motor frame 223 and the rotor member 224. Is provided. For this reason, the tube 158 can enter the motor 222 disposed in the suspension spring 18 and the stroke amount in the axial direction can be increased, so that the axial size can be easily reduced. .
Moreover, the bending load of the vehicle suspension device 201 can be supported by the shaft member 251 whose upper end is fixed to the motor frame 223, and the vehicle suspension device 201 including the shaft member 251 can be made thin overall. .

A ball screw nut 245 fixed in the rotor member 224 has a male screw portion 159 formed on the outer peripheral surface of substantially the upper half of the tube 158 connected to the left front wheel 3A or the right front wheel 3B via the axle bracket 9. Since the axial displacement of the tube 158 and the rotation of the rotor member 224 are relatively converted, the linear motion of the tube 158 is achieved by short-circuiting the coils 32 wound around the stator 31. In addition, it is possible to generate a damping force that suppresses the above, and to make the damping force variable by applying a predetermined voltage to each coil 32 wound around the stator 31.
Further, the metal bearing 65 that contacts the outer peripheral surface of the shaft member 251 is fixed to the inner peripheral portion near the upper end of the tube 158, and the metal bearing 51 that contacts the inner peripheral surface of the tube 158 is fixed to the shaft member 251. Therefore, it is possible to increase the distance between the metal bearings 65 and the metal bearings 51 supporting the lateral load in the axial direction, thereby improving the riding comfort.

  The present invention is not limited to the first to sixth embodiments described above, and various improvements and modifications can be made without departing from the scope of the present invention. For example, the following may be used.

(A) In the first to sixth embodiments, the coils 32 are wound around the stator 31 and the permanent magnets 24B are attached to the positions facing the coils 32 on the outer periphery of the core 24A by bonding or the like. The coils 32 may be wound around the inner periphery of the stator 31 and the permanent magnets 24B may be attached to the positions facing the coils 32 by bonding or the like.
Thereby, since each motor frame 23,223 is being fixed with respect to the vehicle body 2 via the vehicle body attachment member 5, each coil 32 receives the electric current resulting from an induced electromotive force by rotation of each rotor member 24,224. Flowing. For this reason, when each coil 32 is short-circuited, an electromagnetic force is generated in each coil 32, and a torque against the rotation of each shaft member 25, 251 is generated. When each coil 32 of each rotor member 24, 224 is excited, each rotor member 24, 224 is rotated and each tube 8, 158 is moved in the axial direction, so that the damping force can be varied. It becomes possible to comprise.

  (B) In the first to sixth embodiments, the coils 32 are wound around the stator 31 and the permanent magnets 24B are attached to the positions facing the coils 32 on the outer peripheral portion of the core 24A by bonding or the like. The coil is wound around both the core 24A, the electromagnet is configured by energizing the coil wound around either the stator 31 or the core 24A, and the coil wound around the other is short-circuited. Also good. As a result, it is possible to generate torque against the rotation of the shaft members 25 and 251.

It is a figure which shows the structure of the vehicle provided with the vehicle suspension apparatus which concerns on Example 1. FIG. It is side surface sectional drawing which shows the structure of the vehicle suspension apparatus which concerns on Example 1. FIG. It is a figure which shows the state which the vehicle suspension apparatus shown in FIG. 2 shrunk. It is a figure which shows the state which the vehicle suspension apparatus shown in FIG. 2 extended. It is side surface sectional drawing which shows the structure of the vehicle suspension apparatus which concerns on Example 2. FIG. It is side surface sectional drawing which shows the structure of the vehicle suspension apparatus which concerns on Example 3. FIG. It is side surface sectional drawing which shows the structure of the vehicle suspension apparatus which concerns on Example 4. FIG. FIG. 10 is a side cross-sectional view illustrating a configuration of a vehicle suspension device according to a fifth embodiment. It is a figure which shows the state which the vehicle suspension apparatus shown in FIG. 8 shrunk. It is a figure which shows the state which the vehicle suspension shown in FIG. 8 extended. FIG. 10 is a side cross-sectional view illustrating a configuration of a vehicle suspension device according to a sixth embodiment. It is a figure which shows the state which the vehicle suspension apparatus shown in FIG. 11 shrunk. It is a figure which shows the state which the vehicle suspension shown in FIG. 11 extended.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3A Left front wheel 3B Right front wheel 4, 81, 91, 101, 121, 201 Vehicle suspension device 5 Car body mounting member 8, 158 Tube 9 Axle bracket 15 Upper suspension spring receiver 18 Suspension spring 19, 161 Dust cover 22, 122, 222 Motor 23, 223 Motor frame 24, 224 Rotor member 24A Core 24B Permanent magnet 25, 151, 251 Shaft member 25A, 159 Male thread 31 Stator 32 Coil 45, 145, 245 Ball screw nut 49, 112 Shaft port member 51 , 65 Metal bearing 55 Lubricating oil 120 Lower suspension spring holder

Claims (10)

A vehicle body mounting member provided with an upper suspension spring receiver and a motor frame that is disposed below the upper suspension spring receiver and opens downward;
A stator provided on the inner periphery of the motor frame;
A cylindrical rotor that is rotatably mounted in the motor frame and expands downward;
A shaft member that is coaxially inserted in the cylindrical hole of the rotor so as to form a predetermined gap with the inner peripheral surface of the cylindrical hole, and whose upper end is fixed to the rotor and rotates integrally with the rotor;
A tube that is slidably fitted to the outside of the shaft member and is provided so as to be able to enter the gap between the shaft member and the rotor, and connected to the wheel side;
A lower suspension spring support provided on the outer periphery of the tube;
A suspension spring interposed between the upper suspension spring receiver and the lower suspension spring receiver and disposed outside the motor frame;
Conversion means for relatively converting the axial displacement of the tube and the rotation of the rotor;
A vehicle suspension device comprising: The converting means includes
A male screw portion formed on the outer peripheral surface of the shaft member at a predetermined length below;
A ball screw nut fixed in the tube and screwed into the male screw part;
Have
The vehicle suspension system according to claim 1, wherein the axial displacement of the tube and the rotation of the rotor are relatively converted through the ball screw nut and the male screw portion.   The vehicle suspension system according to claim 2, further comprising an inner tube that is inserted into the tube from below and the ball screw nut is fixed to the upper end side, and the lower end side is fixed to the tube. . A first inner tube inserted into the tube from below and having its lower end fixed to the tube;
The ball screw nut is inserted into the tube from above and fixed to the lower end side, and the upper end side of the ball screw nut is fixed to the tube while the ball screw nut is in contact with the first inner tube. Inner tube,
The vehicle suspension apparatus according to claim 2, further comprising: The converting means includes
A male thread portion formed on the outer peripheral surface of the tube at a predetermined length above the tube;
A cylindrical extension extending a predetermined length in the lower direction from the lower end surface of the rotor;
A ball screw nut fixed to a lower end portion of the extension portion and screwed into the male screw portion;
Have
The tube is slidably contacted on the outer side of the shaft member with an inner peripheral portion of the upper end portion of the tube and an inner peripheral portion of the tube facing the lower end portion of the shaft member,
The vehicle suspension system according to claim 1, wherein the axial displacement of the tube and the rotation of the rotor are relatively converted via the male screw portion and the ball screw nut. A vehicle body mounting member provided with an upper suspension spring receiver and a motor frame that is disposed below the upper suspension spring receiver and opens downward;
A stator provided on the inner periphery of the motor frame;
A cylindrical rotor that is rotatably mounted in the motor frame and has both ends in the vertical direction opened ;
A shaft member that is coaxially inserted in the cylindrical hole of the rotor so as to form a predetermined gap with the inner peripheral surface of the cylindrical hole, and whose upper end is fixed to the motor frame;
A tube that is slidably fitted to the outside of the shaft member and is provided so as to be able to enter the gap between the shaft member and the rotor, and connected to the wheel side;
A lower suspension spring support provided on the outer periphery of the tube;
A suspension spring interposed between the upper suspension spring receiver and the lower suspension spring receiver and disposed outside the motor frame;
Conversion means for relatively converting the axial displacement of the tube and the rotation of the rotor;
Equipped with a,
The shaft member has an oil guide hole with a predetermined depth drilled from the lower end portion along the axis,
A plurality of oil holes drilled at a plurality of locations along the axial direction of the outer peripheral surface and communicating with the oil guide holes;
The vehicle suspension apparatus according to claim 1, wherein the tube has a predetermined amount of lubricating oil below the tube . The converting means includes
A male thread portion formed on the outer peripheral surface of the tube at a predetermined length above the tube;
A ball screw nut fixed in the cylindrical hole of the rotor and screwed into the male screw portion of the tube;
Have
The vehicle suspension apparatus according to claim 6, wherein the axial displacement of the tube and the rotation of the rotor are relatively converted through the male screw portion and the ball screw nut. A plurality of coils wound around one of the stator or the rotor;
The vehicle suspension device according to claim 1, further comprising a permanent magnet provided at a position facing the other coil of the stator or the rotor. The shaft member has an oil guide hole with a predetermined depth drilled from the lower end portion along the axis,
A plurality of oil holes drilled at a plurality of locations along the axial direction of the outer peripheral surface and communicating with the oil guide holes;
The vehicle suspension device according to any one of claims 1 to 5, wherein the tube has a predetermined amount of lubricating oil below the tube. A first bearing member fixed to the inner peripheral portion of the upper end portion of the tube and contacting the outer peripheral surface of the shaft member;
A second bearing member fixed to the outer peripheral portion of the lower end portion of the shaft member and contacting the inner peripheral surface of the tube;
The vehicle suspension device according to any one of claims 1 to 9, further comprising:

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