JP2005059684A - In-wheel motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-wheel motor capable of efficiently cooling a motor.
A wheel disk 10 is fastened by a screw 1 to a hub 20 located on one end face side of a motor 60. A housing 30 is disposed on the opposite side of the hub 20 from the wheel disk 10. The housing 30 houses the motor 60. The motor 60 includes a stator core 61, a stator coil 62 and a rotor 63. The wheel disc 10 has a through hole 11, and the hub 20 has a through hole 21. The through hole 21 faces the through hole 11. The through hole 11 is provided in the projection unit 10 </ b> D of the motor 60 onto the wheel disk 10. When an automobile equipped with the electric wheels 100 travels, the outside of the wheel disk 10 becomes negative pressure, and an air flow that flows in the direction indicated by arrows 2 and 3 is generated.
[Selection] Figure 1

Description

  The present invention relates to an in-wheel motor, and more particularly to an in-wheel motor capable of efficiently cooling the motor.

  A conventional in-wheel motor includes a motor, a pump, a case, and a wheel disc. The case is composed of a motor chamber and a pump chamber. The motor is accommodated in the motor chamber of the case, and the pump is accommodated in the pump chamber of the case.

  A case housing the motor and pump is disposed opposite the wheel disc. A cooling fin is provided on the surface of the case facing the wheel disc. The cooling fin dissipates heat generated inside the case. The pump circulates the oil stored in the oil reservoir and cools the stator coil of the motor (Patent Document 1).

  Thus, in the conventional in-wheel motor, the motor is cooled by the cooling fins and the circulating oil provided in the motor case.

Another conventional in-wheel motor includes a hollow knuckle, a hollow hub, and a motor. The motor is disposed on the outer peripheral side of the hub. And a communicating path is formed in a knuckle and a hub, and an in-wheel motor is cooled by flowing air into a communicating path (patent document 2).
JP-A-5-338446 Japanese Patent No. 2554697

  However, in the cooling method disclosed in Patent Document 1, the cooling fin dissipates heat generated inside the case that houses the motor and the pump, and thus there is a problem that the cooling of the motor is insufficient.

  Further, the cooling method disclosed in Patent Document 2 requires a cooling fan, and there is a problem that it is difficult to cool the motor coil.

  Therefore, the present invention has been made to solve such a problem, and an object thereof is to provide an in-wheel motor capable of efficiently cooling the motor.

  According to the present invention, the in-wheel motor includes a motor, a wheel, and a through hole. The wheel is assembled on one end face side of the motor. A through-hole is provided in the projection part to the wheel of a motor, or the projection part vicinity, and penetrates the front and back of a wheel.

  Preferably, the through hole is provided in a portion excluding a fastening portion between the hub and the wheel.

  Preferably, the through hole is composed of a plurality of holes arranged radially.

  Preferably, the through hole includes first and second open ends. The first opening end is provided on one main surface of the wheel on the motor side. The second open end is provided on one main surface of the wheel opposite to the motor side. The first and second open ends are provided at the same radial position from the center of the wheel. The first opening end is provided in front of the second opening end in the rotation direction of the wheel.

  According to the present invention, the in-wheel motor includes a motor, a wheel, first and second through holes, a hub, and an air flow generating member. The wheel is assembled on one end face side of the motor. The first through hole is provided in the projection portion of the motor on the wheel or in the vicinity of the projection portion, and penetrates the front and back of the wheel. The hub is disposed between the motor and the wheel and is substantially circular. The second through hole is provided to face the first through hole and penetrates the front and back of the hub. The air flow generating member is provided on one main surface of the hub on the motor side. And an airflow production | generation member is located in the back side rather than the opening end by the side of the motor of a 2nd through-hole in the rotation direction of a wheel.

  In the in-wheel motor according to the present invention, the wheel is assembled on one end face side of the motor. And the through-hole which penetrates the front and back of a wheel is provided in the projection part to the wheel of a motor, or the projection part vicinity. When an automobile equipped with an electric wheel including an in-wheel motor travels, air on the side of the body of the automobile is pushed away, and an air flow that flows from the inside of the wheel where the motor is arranged to the outside of the wheel through the through hole Arise.

  Therefore, according to the present invention, the motor can be efficiently cooled.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic sectional view of an electric wheel provided with an in-wheel motor according to an embodiment of the present invention. Referring to FIG. 1, an electric wheel 100 includes a wheel disk 10, a hub 20, a housing 30, a brake rotor 40, a brake caliper 50, a motor 60, bearings 71 to 76, a planetary gear 80, A shaft 110, an oil pump 120, a tire 130, and an oil passage 150 are provided.

  The wheel disc 10 has a substantially cup shape, and includes a disc portion 10A and a rim portion 10B. The wheel disc 10 accommodates the hub 20, the housing 30, the brake rotor 40, the brake caliper 50, the motor 60, the bearings 71 to 76, the planetary gear 80, the shaft 110, the oil pump 120, and the oil passage 150. Good.

  The wheel disc 10 is connected to the hub 20 by fastening the disc portion 10 </ b> A to the hub 20 with the screw 1. The hub 20 is fixed to the shaft 110. The wheel disc 10 has a through hole 11, and the hub 20 has a through hole 21. The through hole 21 is provided to face the through hole 11. The through hole 11 penetrates the front and back of the wheel disc 10. The through hole 21 penetrates the front and back of the hub 20.

  The brake rotor 40 is arranged such that the inner peripheral end is fixed to the hub 20 and the outer peripheral end passes through the brake caliper 50. The brake caliper 50 includes a brake piston 51 and brake pads 52 and 53. The brake pads 52 and 53 sandwich the outer peripheral end of the brake rotor 40. When brake oil is supplied from the opening 50A, the brake piston 51 moves to the right side of the page and pushes the brake pad 52 to the right side of the page. When the brake pad 52 is moved to the right side of the drawing by the brake piston 51, the brake pad 53 is moved to the left side of the drawing in response. As a result, the brake pads 52 and 53 sandwich the outer peripheral end of the brake rotor 40 and the electric wheel 100 is braked.

  A housing 30 is disposed on the left side of the hub 20 in the drawing. The housing 30 houses the motor 60. Motor 60 includes a stator core 61, a stator coil 62, and a rotor 63. The stator core 61 is fixed to the housing 30. The stator coil 62 is wound around the stator core 61. When motor 60 is a three-phase motor, stator coil 62 includes a U-phase coil, a V-phase coil, and a W-phase coil. A rotor 63 is disposed on the inner peripheral side of the stator core 61 and the stator coil 62.

  Planetary gear 80 includes a sun gear shaft 81, a sun gear 82, a pinion gear 83, a planetary carrier 84, a ring gear 85, and a pin 86. Sun gear shaft 81 is connected to rotor 63 of motor 60. The sun gear shaft 81 is rotatably supported by bearings 73 and 74. The sun gear 82 is connected to the sun gear shaft 81.

  The pinion gear 83 meshes with the sun gear 82 and is rotatably supported by a bearing 76 disposed on the outer periphery of the pin 86. Planetary carrier 84 is connected to pinion gear 83 and shaft 110. The planetary carrier 84 is rotatably supported by the bearing 75. The ring gear 85 is fixed to the case. The pin 86 is connected to the pinion gear 83 via the bearing 76.

  The shaft 110 is rotatably supported by bearings 71 and 72. The shaft 110 incorporates an oil passage 111. The oil passage 111 has one end connected to the oil pump 120 and the other end closed. The oil passage 111 has a plurality of oil holes 112.

  The oil pump 120 is provided at one end of the shaft 110. The oil passage 121 is provided inside the pin 86 of the planetary gear 80. The oil passage 150 has one end connected to the oil pump 120 and the other end inserted into the oil reservoir 140.

  The oil pump 120 pumps up the oil stored in the oil reservoir 140 through the oil passage 150 and supplies the pumped oil to the oil passage 111.

  Then, the oil supplied to the oil passage 111 is discharged from the plurality of oil holes 112 due to the centrifugal force generated by the rotation of the shaft 110 and supplied to the stator core 61, the stator coil 62, the bearings 71 to 76, and the oil passage 121. . The oil passage 121 supplies oil to the planetary gear 80.

  Thereby, the bearings 71 to 76 and the planetary gear 80 are lubricated, and the stator core 61 and the stator coil 62 are cooled.

  Thereafter, the oil returns to the oil reservoir 140 due to gravity drop.

  Thus, oil pump 120 circulates oil, cools stator core 61 and stator coil 62, and lubricates bearings 71-76 and planetary gear 80.

  The tire 130 is fixed to the outer edge of the rim portion 10B of the wheel disc 10.

  When an alternating current is supplied to the stator coil 62 by a switching circuit (not shown), the rotor 63 rotates and the motor 60 outputs a predetermined torque. The output torque of the motor 60 is transmitted to the planetary gear 80 via the sun gear shaft 81. The planetary gear 80 changes the output torque received from the sun gear shaft 81 by the sun gear 82 and the pinion gear 83, that is, changes speed and outputs it to the planetary carrier 84. The planetary carrier 84 transmits the output torque of the planetary gear 80 to the shaft 110, and the shaft 110 rotates the hub 20 and the wheel disc 10 at a predetermined number of rotations. Thereby, the electric wheel 100 rotates at a predetermined number of rotations.

  FIG. 2 is a perspective view of the wheel disc 10 and the hub 20 shown in FIG. With reference to FIG. 2, the wheel disc 10 has through holes 11 to 15 and screw holes 16 </ b> A to 16 </ b> E. The hub 20 has a substantially circular shape, and includes through holes 21 to 25 and screw holes 26A to 26E. The protruding portion 20 </ b> A of the hub 20 is fitted into the opening 10 </ b> C of the wheel disc 10.

  The screw holes 26A to 26E are provided corresponding to the screw holes 16A to 16E, respectively. The through holes 21 to 25 are provided corresponding to the through holes 11 to 15, respectively. The through holes 11 to 15 and 21 to 25 are arranged radially.

  When the protruding portion 20A of the hub 20 is fitted into the opening 10C of the wheel disk 10, the screw holes 26A to 26E are opposed to the screw holes 16A to 16E, respectively, and the through holes 21 to 25 are respectively through holes. Opposite to 11-15. The wheel disc 10 is fastened to the hub 20 by connecting the screw holes 16A, 26A; 16B, 26B; 16C, 26C; 16D, 26D;

  Accordingly, the through holes 11 to 15 and 21 to 25 are provided in a portion excluding the fastening portion between the wheel disk 10 and the hub 20.

  Referring to FIG. 1 again, when motor-driven wheel 100 is mounted on the automobile and rotates at a predetermined rotational speed, the automobile travels. The body side surface of the automobile becomes negative pressure as the automobile pushes air away. That is, the right side of the wheel disk 10 is negative pressure. Then, as indicated by arrows 2 and 3, an air flow is generated from the inside of the wheel disc 10 to the outside of the wheel disc 10 through the through holes 11 and 21. As a result, the motor 60 is cooled by the air flow.

  As described above, in the present invention, an air flow that flows from the inside of the wheel disc 10 to the outside is generated by utilizing the fact that the outside of the wheel disc 10 becomes negative pressure as the automobile equipped with the electric wheels 100 travels. The through hole 11 is provided in the wheel disc 10.

  Due to this feature, the motor 60 installed inside the wheel disk 10 can be cooled. In particular, since the motor 60 is cooled by the air flow generated when the automobile travels, the cooling efficiency of the motor 60 can be increased. Further, it is not necessary to provide a cooling fan, and the cost can be reduced.

  The through hole 11 (including the through holes 12 to 15) is provided in the projection unit 10 </ b> D that projects the motor 60 onto the wheel disk 10. Thus, by providing the through hole 11 (including the through holes 12 to 15) in the projection unit 10 </ b> D, an air flow is generated in the vicinity of the motor 60 when an air flow is generated from the inside of the wheel disk 10 to the outside. be able to. As a result, the motor 60 can be efficiently cooled.

  In the present invention, the through hole 11 (including the through holes 12 to 15) is not limited to the projection unit 10D, and may be provided in the vicinity of the projection unit 10D. That is, the through-hole 11 (including the through-holes 12 to 15) may be provided at a position where the airflow flows to the outside of the wheel disk 10 through the vicinity of the motor 60 when the automobile travels.

  FIG. 3 is a plan view of the wheel disc 10 as viewed from the direction A shown in FIG. Referring to FIG. 3, through holes 11 to 15 are regions excluding a fastening portion (screw holes 16 </ b> A to 16 </ b> E) between wheel disc 10 and hub 20 in projection portion 10 </ b> D of motor 60 onto wheel disc 10. 17 is provided.

  FIG. 4 is a perspective view of the wheel disc and the hub when another hub is used. Referring to FIG. 4, wheel disc 10 has screw holes 18 </ b> A to 18 </ b> D and through holes 31 to 34. The hub 200 has a substantially cross shape and has screw holes 201A to 201D. The screw holes 201A to 201D are provided corresponding to the screw holes 18A to 18D of the wheel disc 10, respectively. The through holes 31 to 34 are provided corresponding to the space portions 205 to 208 of the hub 200, respectively.

  By fitting the protruding portion 200A of the hub 200 into the opening 10C of the wheel disk 10, the screw holes 201A to 201D are opposed to the screw holes 18A to 18D, respectively, and the through holes 31 to 34 are respectively space portions. It touches 205-208. The wheel disk 10 is fastened to the hub 200 by connecting the screw holes 18A, 201A; 18B, 201B; 18C, 201C; 18D, 201D with screws.

  Therefore, the through holes 31 to 34 are provided in a portion excluding a fastening portion between the wheel disk 10 and the hub 200. When the hub has a cross shape, the through holes 31 to 34 of the wheel disc 10 are in contact with the space portions 205 to 208 of the hub 200, respectively. It flows from the inside to the outside of the wheel disc 10 through the space portions 205 to 208 and the through holes 31 to 34. Thereby, the motor 60 is efficiently cooled.

  Next, other examples of through holes formed in the wheel disc 10 and the hub 20 will be described. FIG. 5 is a plan view of the through hole and the screw hole. Referring to FIG. 5, a through hole 41 is formed between screw hole 16C and screw hole 16D. The wheel disc 10 rotates in the direction of arrow 4. The screw holes 16C, 16D and the through hole 41 are formed at the same radial position from the center of the wheel disk 10.

  6 is a cross-sectional view taken along line VI-VI shown in FIG. Referring to FIG. 6, the hub 20 has a through hole 45. The through hole 45 is provided to face the through hole 41. The through hole 41 has open ends 41A and 41B, and the through hole 45 has open ends 45A and 45B.

  The open end 41A is provided on one main surface 10E of the wheel disc 10 on the motor 60 side, and the open end 41B is provided on one main surface 10F on the opposite side of the wheel disc 10 from the motor 60 side.

  The opening end 45A is provided on one main surface 20B of the hub 20 on the motor side, and the opening end 45B is provided on one main surface 20C on the opposite side of the hub 20 from the motor side.

  The opening end 41A is located in front of the opening end 41B in the rotation direction of the wheel disk 10 (the direction indicated by the arrow 4). Further, the opening end 45A is located in front of the opening end 45B in the rotation direction of the wheel disk 10. That is, the through holes 41 and 45 are formed obliquely with respect to the rotation direction of the wheel disk 10.

  In this invention, preferably, the through holes 11 to 15 shown in FIG. 2 and the through holes 31 to 34 shown in FIG. 4 are formed by the through holes 41, and the through holes 21 to 25 shown in FIG. To do.

  When the motor vehicle 100 mounted on the automobile rotates and the automobile travels, an air flow that flows from the housing 30 side to the outside of the wheel disc 10 is generated as indicated by an arrow 5. Since the through holes 41 and 45 are formed obliquely with respect to the rotation direction of the wheel disk 10, the air flow becomes a large air flow. As a result, the cooling efficiency of the motor 60 can be further increased.

  In the present invention, the fin 160 may be provided on one main surface 20B of the hub 20. The fin 160 is provided on the rear side of the opening end 45 </ b> A with respect to the rotation direction of the wheel disk 10. The fin 160 guides the air flowing into the space portion 27 from the housing 30 side to the through hole 45 when the automobile on which the electric wheel 100 is mounted travels. That is, the fin 160 prevents the air that has flowed into the space 27 from flowing to the rear side of the through hole 45, and generates an air flow that flows to the outside of the wheel disk 10 through the through hole 45 and the through hole 41. .

  Thereby, it is possible to prevent the air that has taken heat from the motor 60 from flowing again to the housing 30 side and staying inside the wheel disk 10. That is, the cooling efficiency of the motor 60 can be increased by reliably guiding the air that has taken heat from the motor 60 to the outside of the wheel disk 10.

  The fin 160 is preferably made of an elastic member. When the motor vehicle equipped with the motorized wheels 100 travels on a curve and the motorized wheels 100 tilt, the housing 30 contacts the fins 160. In this case, if the fin 160 is made of a material other than the elastic member, the fin 160 may be damaged. Therefore, the fin 160 is made of an elastic member in order to prevent the fin 160 from being damaged even if the motor-driven wheel 100 is inclined and the housing 30 contacts the fin 160.

  The wheel disk 10, the through holes 11 to 15, 21 to 25, 31 to 34, 41 and 45, the hubs 20 and 200, the motor 60 and the fins 160 constitute an “in-wheel motor” according to the present invention.

  Further, the fin 160 constitutes an “air flow generating member”.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to an in-wheel motor with good cooling efficiency.

It is a schematic sectional drawing of the electric wheel provided with the in-wheel motor by embodiment of this invention. It is a perspective view of the wheel disc and hub shown in FIG. It is a top view of the wheel disc seen from the A direction shown in FIG. It is a perspective view of a wheel disc at the time of using other hubs, and a hub. It is a top view of a through hole and a screw hole. FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 5.

Explanation of symbols

  1 screw, 2-5 arrows, 10 wheel disc, 10A disc portion, 10B rim portion, 10C, 50A opening, 10D projection portion, 10E, 10F, 20B, 20C one main surface, 11-15, 21-25, 31 34, 41, 45 Through hole, 16A-16E, 18A-18D, 26A-26E, 201A-201D Screw hole, 17 region, 20, 200 Hub, 20A Protruding part, 27, 205-208 Space part, 30 Housing, 40 Brake rotor, 41A, 41B, 45A, 45B Open end, 50 Brake caliper, 51 Brake piston, 52, 53 Brake pad, 60 Motor, 61 Stator core, 62 Stator coil, 63 Rotor, 71-76 Bearing, 80 Planetary gear, 81 Sun gear shaft, 82 Sun gear, 83 Pinion gear, 84 planetary carrier, 85 ring gear, 86 pin, 100 electric wheel, 110 shaft, 111, 121, 150 oil passage, 112 oil hole, 120 oil pump, 130 tire, 140 oil reservoir, 160 fin.

Claims (5)

A motor,
A wheel assembled on one end face side of the motor;
An in-wheel motor provided with the projection part to the wheel of the motor, or the through-hole which penetrates the front and back of the wheel provided in the projection part vicinity.   The in-wheel motor according to claim 1, wherein the through hole is provided in a portion excluding a fastening portion between the hub and the wheel.   The in-wheel motor according to claim 1, wherein the through hole is composed of a plurality of holes arranged radially. The through hole is
A first opening end provided on one main surface of the wheel on the motor side;
A second open end provided on one main surface of the wheel opposite to the motor side,
The first and second open ends are provided at the same radial position from the center of the wheel,
The in-wheel motor according to claim 1, wherein the first opening end is provided in front of the second opening end in a rotation direction of the wheel. A motor,
A wheel assembled on one end face side of the motor;
A first through hole provided in the projection portion of the motor on the wheel or in the vicinity of the projection portion and penetrating the front and back of the wheel;
A substantially circular hub disposed between the motor and the wheel;
A second through hole provided facing the first through hole and penetrating the front and back of the hub;
An air flow generating member provided on one main surface of the hub on the motor side,
The air flow generating member is an in-wheel motor that is located on the rear side of the motor-side opening end of the second through hole in the rotation direction of the wheel.

Images