JP2005132174A - Vehicular component member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular component member capable of suppressing the degradation of a ground contact property of a tire and ride quality caused by an increase of an unsprung mass, in a vehicle with an in-wheel motor mounted therein. <P>SOLUTION: Teeth 31, 31A and 31B are embedded in a case 20 of an in-wheel motor 3 from the outside of a vehicle. A stator coil 30A (30B) is coiled around the teeth 31A(31B) arranged in the vertical direction. A coil spring 36 (38) is mounted between the tip of the tooth 31A (31B) and the lower side of the stator coil 30A (30B), and a coil spring 37 (38) is mounted between a base of the tooth 31A (31B) and the upper side of the stator coil 30A(30B). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle component member, and more particularly, to a vehicle component member that includes an in-wheel motor and is disposed under a spring.

Conventionally, an in-wheel motor vehicle in which a power train is eliminated and a driving motor is mounted on each wheel of the vehicle is known. As such an in-wheel motor vehicle, Patent Document 1 described below describes a vehicle equipped with an outer rotor type in-wheel motor.
Japanese Patent Laid-Open No. 10-285891 (page 5-9, FIG. 1)

  In a vehicle equipped with an in-wheel motor, the unsprung mass increases with the addition of the in-wheel motor. Therefore, there is a problem that unsprung vibration is increased, and the grounding property and riding comfort of the tire are deteriorated.

  The present invention has been made to solve the above-described problems, and in a vehicle equipped with an in-wheel motor, a vehicle configuration capable of suppressing deterioration of tire grounding property and riding comfort due to an increase in unsprung mass. An object is to provide a member.

  A vehicle constituent member according to the present invention is a member constituting a part of a vehicle constituent member in a vehicle constituent member provided with an in-wheel motor and disposed under a spring, and other members of the vehicle constituent member A mass member that is pivotably coupled to the mass member, and an elastic member that couples the mass member and another member, and the elastic member and the mass member function as a dynamic damper.

  According to the vehicle component according to the present invention, the mass member that constitutes a part of the vehicle component disposed under the spring and the elastic member that connects the mass member and the other vehicle component are dynamic dampers. Since it functions, it becomes possible to suppress the vibration of the unsprung vehicle component, that is, the unsprung vibration.

  A vehicle constituent member according to the present invention is a coil in which a stator constituting an in-wheel motor includes teeth arranged radially on a surface perpendicular to the rotation axis of the in-wheel motor, and a mass member is wound around the teeth. It is preferable that the elastic member elastically couples the stator and the coil.

  In this case, since the coil wound around the teeth is swung with respect to the stator, the unsprung vibration can be canceled by the vibration of the coil.

  Further, it is preferable that the teeth are provided in the vertical direction and the coil is supported by the elastic member so as to be swingable up and down.

  In this way, the coil is swung in the vertical direction, so that the unsprung vibration in the vertical direction can be canceled by the vibration of the coil.

  In addition, the acceleration sensor that detects the vertical acceleration of the in-wheel motor, the magnetic core attached to the inner peripheral wall surface of the coil, and the coil and the magnetic core are driven in a direction that cancels the acceleration detected by the acceleration sensor. It is preferable to further include energization means for energizing the coil so that force is applied.

  In this case, since the coil and the magnetic core are driven in a direction that cancels the vertical acceleration of the in-wheel motor, the unsprung vibration is further reduced as compared with the case where the unsprung vibration is canceled by the free vibration of the coil. Is possible.

  The vehicle constituent member according to the present invention is preferably a brake caliper in which the mass member is connected and supported so as to be swingable about the rotation axis of the in-wheel motor.

  In this way, the brake caliper can be used as a dynamic damper.

  The vehicle component according to the present invention preferably has a shock absorber, and the elastic member and the mass member are preferably mounted in the cylinder of the shock absorber.

  In this case, the elastic member and the mass member attached in the cylinder of the shock absorber function as a dynamic damper.

  In the present specification, the vehicle constituent member disposed under the spring refers to a suspension member constituted by a lower arm, an upper arm, a wheel, a tire, an in-wheel motor, a brake, and the like.

  According to the present invention, the elastic member connected to the vehicle constituent member disposed under the spring and the mass member constituting a part of the vehicle constituent member function as a dynamic damper. Deterioration of tire ground contact and riding comfort can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the same reference numerals are used for the same or corresponding parts.

(First embodiment)
First, the configuration of a vehicle component member (hereinafter referred to as “suspension member”) 1 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the underbody member 1. FIG. 2 is a cross-sectional view taken along line II-II in FIG. Here, a description will be given using the right front wheel of the vehicle as an example. Since the left front wheel, the left rear wheel, and the right rear wheel are the same as or similar to the case of the right front wheel, description thereof is omitted. Note that this embodiment may be applied only to the left and right front wheels or the left and right rear wheels. Further, in this specification, the forward direction when the vehicle is moving forward is defined as “front”, and words indicating directions such as front and rear, left and right, and up and down are used.

  The suspension constituting this embodiment is a high-mount double wishbone type, and a wheel support 12 is mounted between a lower arm 10 and an upper arm 11 so as to be steerable. A shock absorber 15 having a coil spring 16 is provided between the lower arm 10 and the vehicle body.

  A case 20 that houses the in-wheel motor 3 is fixed to the outside of the wheel support 12 by bolts 21. The case 20 has a convex body 22 serving as an axle at the center thereof, and a hub bearing 23 is fitted therein. Further, the nut 25 is screwed into the convex body 22 in a state where the hub bearing 23 is fitted to the convex body 22, whereby the inner race of the hub bearing 23 is fixed to the convex body 22.

  Eighteen teeth 31, 31A, 31B are embedded in the case 20 from the outside of the vehicle. Each of the teeth 31, 31A, 31B is composed of, for example, a silicon steel sheet laminate in which a large number of silicon steel sheets whose surfaces are covered with an insulating film are laminated and a pole portion is welded and joined in the thickness direction by laser welding or the like. Has been. Each of the teeth 31, 31 </ b> A, 31 </ b> B configured in this way is radially arranged in the case 20 so that the tip thereof faces the axle, and is fixed to the case 20 together with the stator cover 33 with bolts 32. A stator coil 30 is wound around the teeth 31.

  Stator coils 30A and 30B are wound around the teeth 31A and 31B arranged in the vertical direction. A coil spring 36 is attached between the tip of the tooth 31A and the lower surface of the stator coil 30A, and a coil spring 37 is attached between the root of the tooth 31A and the upper surface of the stator coil 30A. By the coil springs 36 and 37, the stator coil 30A can swing in the vertical direction.

  A coil spring 38 is attached between the tip of the tooth 31B and the upper surface of the stator coil 30B, and a coil spring 39 is attached between the root of the tooth 31B and the lower surface of the stator coil 30B. By the coil springs 38 and 39, the stator coil 30B can swing in the vertical direction.

  By having such a structure, the stator coil 30A and the coil springs 36 and 37, and the stator coil 30B and the coil springs 38 and 39 function as an active damper that absorbs vibration of the suspension member 1 that is a vibrating body. That is, the stator coils 30A and 30B function as mass members of the active damper, and the coil springs 36 to 39 function as elastic members that attenuate vibrations of the stator coils 30A and 30B. The elastic member is not limited to a coil spring, and may be a spring spring or the like. Further, either one of the coil springs 36 or 37 may be omitted. Similarly, either one of the coil springs 38 or 39 can be omitted.

  Between the teeth 31, 31 </ b> A, 31 </ b> B and the stator cover 33, a wiring board 34 and a three-phase wire drawn from the outside are arranged.

  The wiring board 34 is provided with predetermined wiring, and the respective terminals of the stator coils 30, 30 </ b> A, 30 </ b> B are connected to the three three-phase wires of U phase, V phase, and W phase by the wiring. . As a result, a moving magnetic field for rotating the rotor 26 can be formed inside the stator, that is, on the axle side.

  An axle hub 27 and a rotor 26 are fastened and fixed to the outer race of the hub bearing 23 by bolts 28. Thus, the rotor 26 and the axle hub 27 are integrally attached so as to be rotatable around the axle.

  The rotor 26 is composed of a silicon steel plate laminate in which an annular silicon steel plate whose surface is insulated is laminated. The outer peripheral surface of the rotor 26 is uneven in the circumferential direction, and a total of 16 permanent magnets 40 are fixed to the respective recesses by an adhesive.

  A lid 52 having a shaft 51 fixed to the inner rotor of the resolver 50 is fixed to the opening of the axle hub 27 outside the vehicle with bolts. On the other hand, the stator of the resolver 50 is fixed to the resolver support 24, and when the rotor of the resolver 50 rotates as the axle hub 27 rotates, that is, the rotor 26 rotates, an angle signal corresponding to the rotation angle is output. This angle signal is input to an electronic control unit (hereinafter referred to as “ECU”) 60.

  The ECU 60 outputs a switching control signal to the inverter 61 so that the set motor output is output from the in-wheel motor 3, and is constituted by a microprocessor or the like.

  In addition to the resolver 50, the ECU 60 is connected to a current sensor that detects a phase current flowing in the three-phase line. And it is comprised so that switching control of the switching element of the inverter 61, ie, drive control of the in-wheel motor 3, can be performed based on the input signal from these sensors and the set target output of the in-wheel motor 3. ing.

  The inverter 61 converts the electric power stored in the battery 62 from direct current to alternating current and supplies it to the stator coils 30, 30 </ b> A, 30 </ b> B of the in-wheel motor 3 through a three-phase wire and is regenerated by the in-wheel motor 3. The obtained power is converted from alternating current to direct current and stored in the battery 62.

  A wheel 43 is fastened to the outside of the axle hub 27 with a hub bolt 44 and a nut 45 so as to sandwich a disc rotor 42 of the disc brake 5 (see FIG. 5). A brake caliper 51 that constitutes the disc brake 5 together with the disc rotor 42 is fixed to the wheel support 12.

  Since the stator coils 30A and 30B of the in-wheel motor 3 have the above-described structure, the suspension member 1 such as the wheel 43 and the in-wheel motor 3 is suspended via the coil springs 36 and 37 when it vibrates in the vertical direction. The stator coil 30B suspended via the stator coil 30A and the coil springs 38 and 39 swings in the vertical direction and absorbs the vibration of the suspension member 1 that is a vibrating body. Thus, according to the present embodiment, the vibration of the unsprung suspension member 1 is canceled by the vibration of the stator coils 30A and 30B, so that the grounding property and riding comfort of the tire are improved.

  Moreover, according to this embodiment, since the stator coils 30A and 30B which are a part of the suspension member 1 are used as the mass member of the active damper, it is not necessary to newly add a mass member. Therefore, the active damper can be configured without increasing the unsprung mass.

  In addition, basic motor structures, such as the number, arrangement | positioning, and shape of the teeth 31 and the permanent magnet 40, are not restricted to this embodiment. In the present embodiment, the active damper is arranged so as to suppress the vibration in the vertical direction. However, an active damper having a similar configuration can be arranged in the front-rear direction, for example.

(Second Embodiment)
Next, the configuration of the underbody member 2 according to the second embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view of the underbody member 2.

  As shown in FIG. 3, in the present embodiment, an acceleration sensor 63 that detects vertical acceleration is attached to a case 20 that houses the in-wheel motor 4, and is wound around a tooth 31 </ b> A so that it can swing up and down. The magnetic core 46 such as iron is attached to the inner peripheral wall surface of the stator coil 30A, and the magnetic core 47 is wound around the inner peripheral wall surface of the stator coil 30B wound around the teeth 31B so as to be swingable up and down. Is different from the first embodiment in that is attached. Since other configurations are the same as or similar to those of the first embodiment, description thereof is omitted here.

  The acceleration sensor 63 is connected to the ECU 60, and an electric signal corresponding to the vertical acceleration of the in-wheel motor 4 detected by the acceleration sensor 63, that is, the vertical vibration of the underbody member 2 is input to the ECU 60.

  The ECU 60 converts the acceleration detected by the acceleration sensor 63, that is, the switching signal for driving the stator coil 30 </ b> A and the magnetic core 46 and the stator coil 30 </ b> B and the magnetic core 47 so as to cancel the vibration of the suspension member 2. Output to. Inverter 61 supplies electric power to each of stator coils 30 </ b> A and 30 </ b> B based on a switching signal from ECU 60. That is, the ECU 60 and the inverter 61 function as energization means.

  In the present embodiment, when the suspension member 2 such as the wheel 43 or the in-wheel motor 4 vibrates in the vertical direction, the vibration is detected by the acceleration sensor 63, and the stator coil 30A and the magnetic body so as to cancel the detected vibration. The core 46, the stator coil 30B, and the magnetic core 47 are driven in the vertical direction.

  FIG. 4 is a timing chart showing changes in (a) acceleration sensor signal, (b) stator coil drive signal, and (c) unsprung vibration.

  As shown in FIG. 4B, the starter coils 30A and 30B are supplied with coil drive signals having the same phase and amplitude as the vibration detected by the acceleration sensor 63 (FIG. 4A). Thus, by applying a force opposite to the vibration direction, the vibration of the stator coil 30A, the magnetic core 46, the stator coil 30B, and the magnetic core 47 and the vibration of the underbody member cancel each other.

  The solid line in FIG. 4C shows a change in the vibration of the underbody member 2 when the stator coils 30A and 30B are energized so as to cancel the vibration of the underbody member 2. On the other hand, dotted lines indicate changes in the vibration of the underbody member 2 when the energization for canceling the vibration is not performed in the stator coils 30A and 30B. FIG. 4C shows that the vibration level is further reduced by driving the stator coils 30 </ b> A and 30 </ b> B so as to cancel the vibration of the underbody member 2.

  According to the present embodiment, since the stator coils 30A and 30B and the magnetic cores 46 and 47 are driven in a direction that cancels the vertical acceleration of the in-wheel motor 4, unsprung vibration is caused by free vibration of the stator coils 30A and 30B. Compared to canceling, the unsprung vibration can be further reduced. Therefore, it is possible to further improve the ground contact property and riding comfort of the tire.

  In addition, basic motor structures, such as the number, arrangement | positioning, and shape of the teeth 31 and the permanent magnet 40, are not restricted to this embodiment. In the present embodiment, the active damper is arranged so as to suppress the vibration in the vertical direction. However, an active damper having a similar configuration can be arranged in the front-rear direction, for example.

(Third embodiment)
Next, the configuration of the disc brake 5 in the underbody member according to the third embodiment will be described with reference to FIG. FIG. 5 is a diagram showing the configuration of the disc brake 5.

  In the present embodiment, the brake caliper 51 of the disc brake 5 is fixed to the wheel support 12 in that the brake caliper 51 is swingably mounted around the axle, that is, around the center of the disc rotor 42. Different from form. Since other configurations are the same as or similar to those of the first embodiment, description thereof is omitted here. In the first embodiment, the in-wheel motor 3 incorporating the active damper function is used. However, in the present embodiment, a normal in-wheel motor having no active damper function may be used.

  A caliper swing guide 73 is attached to the brake caliper 51 in the rotational direction of the disc rotor 42. The other end of the caliper swing guide 73 is attached to a guide attachment plate 71 fixed to the case 20 of the in-wheel motor with a bolt or the like. A caliper support rubber 74 is attached to the brake caliper 51 in the counter-rotating direction of the disc rotor 42. The other end of the caliper support rubber 74 is attached to a support rubber mounting plate 72 fixed to the case 20 of the in-wheel motor with a bolt or the like.

  By having such a configuration, the brake caliper 51 can swing around the axle, that is, around the center of the disc rotor 42 along the caliper swing guide 73.

  Since the brake caliper 51 has the above-described structure, when the suspension member such as the wheel 43 or the in-wheel motor vibrates, the brake caliper 51 suspended via the caliper support rubber 74 swings and is a vibrating body. Absorbs vibration of the underbody member.

  FIG. 6 shows the vibration characteristics of the underbody member according to the present embodiment. In FIG. 6, the dotted line shows the vibration characteristics of a conventional underbody member without an in-wheel motor. The alternate long and short dash line indicates the vibration characteristics of the underbody member equipped with the in-wheel motor. In the undercarriage member equipped with the in-wheel motor, the unsprung mass increases compared to the conventional undercarriage member, so the vibration level in the unsprung resonance region deteriorates.

  The solid line in FIG. 6 shows the vibration characteristics of the underbody member according to this embodiment when the brake caliper 51 functions as an active damper. As shown by the solid line in FIG. 6, in this embodiment, the vibration level in the resonance frequency region of the underbody member is reduced.

  Thus, according to the present embodiment, the vibration of the unsprung suspension member is offset by the vibration of the brake caliper 51, so that the ground contact property and riding comfort of the tire are improved.

  In the present embodiment, the caliper support rubber 74 is used as the elastic member, but a spring or the like can be used instead of the rubber.

(Fourth embodiment)
Next, the configuration of the underbody member according to the fourth embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of a shock absorber 15A applied to the underbody member according to the present embodiment.

  This embodiment is different from the first embodiment in that a shock absorber 15A provided with an active damper is used instead of the conventional shock absorber 15. Since other configurations are the same as or similar to those of the first embodiment, description thereof is omitted here. In the first embodiment, the in-wheel motor 3 incorporating the active damper function is used. However, in the present embodiment, a normal in-wheel motor having no active damper function may be used.

  The shock absorber 15A has a cylinder tube 81 filled with damper oil. Inserted into the cylinder tube 81 are a piston 82 that is slidable in the axial direction, and a piston rod 83 having one end fixed to the piston 82 and the other end protruding outside the cylinder tube 81.

  A rod guide 85 that slidably supports the piston rod 83 and seals one end of the cylinder tube 81 at the upper portion of the cylinder tube 81, and prevents oil leakage between the piston rod 83 and the rod guide 85. An oil seal 86 is provided. A base valve 88 is fixed to the other end of the cylinder tube 81.

  An outer tube 84 is provided on the outer peripheral side of the cylinder tube 81. A packing 87 is attached to the upper end portion of the outer tube 84.

  The cylinder tube 81 is divided into an upper chamber (extension side liquid chamber) A and a lower chamber (pressure side liquid chamber) B by a piston 82, and between the outer periphery of the cylinder tube 81 and the outer periphery of the outer tube 84. A reservoir chamber C is formed to absorb a change in volume when the piston rod 83 is inserted into or retracted from the cylinder tube 81.

  The piston 82 is formed with a plurality of communication passages that allow the upper chamber A and the lower chamber B to communicate with each other. The base valve 88 is also provided with a plurality of communication passages that allow the lower chamber B and the reservoir chamber C to communicate with each other.

  A cylindrical elastic member 89 mainly composed of rubber, silicon resin, or the like is attached to the lower surface of the rod guide 85 in the cylinder tube 81. A thick cylindrical mass member 90 made of metal is attached to the other end of the cylindrical elastic member 89. Further, a stopper rubber 91 having a stopper function and a buffer function when the piston rod 83 is extended to the maximum is attached to the other end of the cylindrical mass member 90. The cylindrical elastic member 89, the cylindrical mass member 90, and the stopper rubber 91 are arranged at positions where the piston rod 83 is not buffered.

  A cylindrical elastic member 89 and a cylindrical mass member 90 attached in the cylinder tube 81 of the shock absorber 15A function as a dynamic damper.

  As described above, when the shock absorber 15A has the dynamic damper, when the suspension member such as the wheel 43 or the in-wheel motor vibrates in the vertical direction, the cylindrical mass member 90 suspended via the cylindrical elastic member 89 is used. Oscillates in the vertical direction and absorbs the vibration of the suspension member that is the vibrating body.

  FIG. 8 shows the vibration characteristics of the underbody member according to the present embodiment. In FIG. 8, the dotted line shows the vibration characteristics of a conventional suspension member without an in-wheel motor. The alternate long and short dash line indicates the vibration characteristics of the underbody member equipped with the in-wheel motor. In the undercarriage member equipped with the in-wheel motor, the unsprung mass increases compared to the conventional undercarriage member, so the vibration level in the unsprung resonance region deteriorates.

  The solid line in FIG. 8 shows the vibration characteristics of the underbody member according to this embodiment when the shock absorber 15A having the active damper function is mounted. As indicated by the solid line in FIG. 8, in this embodiment, the vibration level in the resonance frequency region of the underbody member is reduced.

  As described above, according to the present embodiment, the vibration of the unsprung suspension member is offset by the vibration of the cylindrical mass member 90 disposed in the cylinder tube 81, so that the grounding property and riding comfort of the tire are improved. improves.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the shape and arrangement of the elastic member and the mass member are not limited to the above embodiment, and a plurality of columnar elastic members and columnar mass members are annularly arranged between the piston rod 83 and the cylinder tube 81. May be.

It is sectional drawing of the vehicle structural member which concerns on 1st Embodiment. It is sectional drawing when cut | disconnecting by the II-II line | wire of FIG. It is sectional drawing of the vehicle structural member which concerns on 2nd Embodiment. It is a timing chart which shows the change of (a) vertical acceleration sensor signal, (b) stator coil drive signal, (c) unsprung vibration. It is a figure which shows the disc brake in the vehicle structural member which concerns on 3rd Embodiment. It is a figure which shows the unsprung vibration characteristic of the vehicle structural member which concerns on 3rd Embodiment. It is sectional drawing of the shock absorber in the vehicle structural member which concerns on 4th Embodiment. It is a figure which shows the unsprung vibration characteristic of the vehicle structural member which concerns on 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Suspension member, 3, 4 ... In-wheel motor, 5 ... Disc brake, 10 ... Lower arm, 11 ... Upper arm, 12 ... Wheel support body, 15, 15A ... Shock absorber, 26 ... Rotor, 30, 30A , 30B ... Starter coil, 31, 31A, 31B ... Teeth, 36, 37, 38, 39 ... Coil spring, 42 ... Disc rotor, 43 ... Wheel, 46, 47 ... Magnetic core, 51 ... Brake caliper, 60 ... ECU , 61 ... Inverter, 62 ... Battery, 63 ... Acceleration sensor, 71 ... Guide mounting plate, 72 ... Support rubber mounting plate, 73 ... Caliper swing guide, 74 ... Caliper support rubber, 81 ... Cylinder tube, 82 ... Piston, 83 ... piston rod, 84 ... outer tube, 85 ... rod guide, 86 ... oil seal, 8 ... packing, 88 ... base valve, 89 ... cylindrical elastic member, 90 ... cylindrical mass member, 91 ... rubber stopper.

Claims (6)

In a vehicle component configured with an in-wheel motor and disposed under a spring,
A member constituting a part of the vehicle constituent member, and a mass member connected to other members of the vehicle constituent member in a swingable manner;
An elastic member that connects the mass member and the other member;
The vehicle constituent member, wherein the elastic member and the mass member function as a dynamic damper. The stator that constitutes the in-wheel motor includes teeth arranged radially on a plane perpendicular to the rotation axis of the in-wheel motor,
The mass member is a coil wound around the teeth,
The vehicle constituent member according to claim 1, wherein the elastic member elastically couples the stator and the coil. The teeth are provided in the vertical direction,
The vehicle component according to claim 2, wherein the coil is supported by the elastic member so as to be swingable up and down. An acceleration sensor for detecting the vertical acceleration of the in-wheel motor;
A magnetic core attached to the inner peripheral wall surface of the coil;
4. An energizing unit that energizes the coil and a magnetic core so that a driving force is applied to the coil and the magnetic core in a direction to cancel the acceleration detected by the acceleration sensor. The vehicle structural member as described in.   2. The vehicle component according to claim 1, wherein the mass member is a brake caliper that is connected and supported so as to be swingable about a rotation axis of the in-wheel motor. The vehicle component has a shock absorber,
The vehicle constituent member according to any one of claims 1 to 5, wherein the elastic member and the mass member are mounted in a cylinder of the shock absorber.

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