WO2020067268A1 - Electric vehicle - Google Patents

Electric vehicle Download PDF

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Publication number
WO2020067268A1
WO2020067268A1 PCT/JP2019/037817 JP2019037817W WO2020067268A1 WO 2020067268 A1 WO2020067268 A1 WO 2020067268A1 JP 2019037817 W JP2019037817 W JP 2019037817W WO 2020067268 A1 WO2020067268 A1 WO 2020067268A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
electric vehicle
swing arm
breather tube
rear wheel
Prior art date
Application number
PCT/JP2019/037817
Other languages
French (fr)
Japanese (ja)
Inventor
梶原詠介
白砂貴盛
鈴木仁
長谷川潤子
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to CN201980064228.8A priority Critical patent/CN112770969B/en
Priority to JP2020549343A priority patent/JP7046215B2/en
Publication of WO2020067268A1 publication Critical patent/WO2020067268A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K11/00—Motorcycles, engine-assisted cycles or motor scooters with one or two wheels
    • B62K11/02—Frames
    • B62K11/10—Frames characterised by the engine being over or beside driven rear wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/12—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg
    • B62K25/14—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg
    • B62K25/20—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg for rear wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/02—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of unchangeable ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/12—Motorcycles characterised by position of motor or engine with the engine beside or within the driven wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K2202/00—Motorised scooters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K2204/00—Adaptations for driving cycles by electric motor

Definitions

  • the present invention relates to an electric vehicle in which a motor and a speed reducer are arranged on a swing arm pivotally supported by a pivot shaft.
  • Japanese Patent No. 5559939 discloses a vehicle body frame, a pivot shaft provided on the vehicle body frame, a swing arm having one end pivotally supported by the pivot shaft, and a rear wheel supported by the other end of the swing arm.
  • An electric vehicle including a motor arranged inside a swing arm and driving a rear wheel, and a reduction gear transmitting the driving force of the motor to the rear wheel is disclosed.
  • the reduction gear is accommodated in a gear case (reduction gear accommodation part) provided in the swing arm, and a breather hose (breather tube) extends from the gear case.
  • the breather hose is arranged around the gear case so as to open downward.
  • the breather tube removes mist-like lubrication oil when the lubrication oil used for the reduction gear evaporates It is provided to reduce the internal pressure by discharging the contained gas to the outside.
  • the breather tube since the breather tube is exposed outside, when the gas is exhausted to the outside, when the gas is cooled and liquefied, the liquefied lubricating oil is discharged from the opening to the outside. As a result, there is a concern that the electric vehicle and the like may become dirty.
  • a vehicle body frame a pivot shaft provided on the vehicle body frame, a swing arm having one end pivotally supported by the pivot shaft and the other end supporting a rear wheel, and the swing arm.
  • An electric vehicle comprising: a motor that drives the rear wheel; and a speed reducer that transmits a driving force of the motor to the rear wheel, wherein the speed reducer is provided on the swing arm and houses the speed reducer.
  • a breather tube extending from the speed reducer housing portion, one end of the breather tube communicates with the speed reducer housing portion, and the other end of the breather tube extends above the swing arm. And is disposed on a part of the electric vehicle that can swing with the swing arm.
  • the lubricating oil liquefied in the breather tube returns (falls) to the reduction gear housing via one end of the breather tube.
  • the liquefied lubricating oil is not discharged to the outside, so that the electric vehicle or the like can be prevented from becoming dirty.
  • FIG. 2 is a left side view of the electric vehicle according to the embodiment.
  • FIG. 2 is a perspective view of the vicinity of rear wheels of the electric vehicle in FIG. 1 as viewed from the rear left.
  • FIG. 3 is a left side view in a state where a swing arm cover of FIGS. 1 and 2 is removed.
  • FIG. 4 is a left side view of a state where a left rotor support portion of FIG. 3 is removed.
  • FIG. 5 is a sectional view taken along line VV in FIG. 3.
  • FIG. 4 is a right side view showing a swing arm and the like cut away. It is a bottom view around the front end part of a swing arm. It is a left view which showed the reduction gear accommodating part.
  • It is a perspective view of a swing arm including a reduction gear accommodation part, a brake mechanism, and a breather tube.
  • FIG. 1 is a left side view of an electric vehicle 10 according to the present embodiment.
  • front and rear, left and right, and up and down directions will be described according to the direction seen by the occupant sitting on the seat 12 of the electric vehicle 10.
  • components arranged on a left and right side may be described with a letter "L” for a component on the left and "R” for a component on the right.
  • the electric vehicle 10 is an electric scooter having a floor portion 14 with a low floor, and runs by rotating and driving the rear wheel 16 with the driving force of a motor 20 built in a swing arm 18 that supports the rear wheel 16.
  • the electric vehicle 10 according to the present embodiment is not limited to the electric scooter of FIG. 1, and can be applied to various electric saddle-ride type vehicles driven by the motor 20. In the following description, a scooter-type electric vehicle 10 will be described.
  • the electric vehicle 10 has a vehicle body frame 22 and a vehicle body cover 24 made of synthetic resin that covers the vehicle body frame 22.
  • the vehicle body frame 22 includes a head pipe 26 at a front end, a down pipe 28 extending obliquely rearward and downward from the head pipe 26, a pair of left and right under frame parts 30L and 30R extending rearward from a rear end of the down pipe 28, and an under frame. And side frame portions 32L and 32R extending obliquely rearward and upward from the rear ends of the portions 30L and 30R.
  • the side frame portions 32L, 32R include rising portions 34L, 34R extending diagonally upward and rearward from the pair of left and right underframe portions 30L, 30R, and rear frames 36L extending rearward from the pair of left and right rising portions 34L, 34R. 36R.
  • the rear ends of the pair of left and right rear frames 36L, 36R are connected by a tail pipe portion 38.
  • Front forks 40L and 40R are attached to the head pipe 26 so as to be steerable.
  • a handle 44 is attached to the upper portions of the front forks 40L and 40R via a steering stem 42.
  • a front wheel 46 is attached to lower ends of the front forks 40L and 40R.
  • a front fender 48 that covers the front wheel 46 from above is attached to the front forks 40L and 40R.
  • connection support portion 50 including a pivot bracket 50a is provided between the under frame portions 30L and 30R and the side frame portions 32L and 32R.
  • the connection support 50 supports a pivot shaft 54 extending in the left-right direction (vehicle width direction) of the electric vehicle 10.
  • a front end (one end) of the swing arm 18 is supported by the pivot shaft 54.
  • the swing arm 18 extends from the pivot shaft 54 to the left of the rear wheel 16 along the front-rear direction of the electric vehicle 10.
  • the rear end (the other end) of the swing arm 18 supports the rear wheel 16.
  • the swing arm 18 incorporates the motor 20 so that the motor 20 is disposed on the left side of the rear wheel 16. Therefore, the swing arm 18 is configured as a swing type power unit.
  • a rear cushion 56 is connected between the rear end of the swing arm 18 and the left rear frame 36L.
  • a rear fender 58 that covers the rear wheel 16 from above is attached to the rear frames 36L and 36R. Further, another fender 60 that directly covers the rear wheel 16 from above between the rear fender 58 and the rear wheel 16 and that can swing with the swing arm 18 is attached to the swing arm 18.
  • the rear frames 36L and 36R support the seat 12 on which the occupant sits from below.
  • a battery 62 of the electric vehicle 10 is disposed in a space between the pair of right and left rising portions 34L and 34R between the seat 12 and the pivot shaft 54.
  • the battery 62 is supported by a pair of left and right rising portions 34L, 34R and rear frames 36L, 36R, and a pipe 64 connecting the rising portions 34L, 34R at the front.
  • a PCU (power control unit) 66 as an electronic component supported by the left and right rising portions 34L and 34R is supported at a position in front of the rear wheel 16 and obliquely behind the battery 62.
  • the PCU 66 includes an inverter and the like, and converts, for example, DC power supplied from the battery 62 to AC power, and supplies the converted AC power to the motor 20.
  • the PCU 66 converts the AC power generated by the motor 20 into DC power and charges the battery 62.
  • the locations of the battery 62 and the PCU 66 shown in FIG. 1 are merely examples, and may be located at other locations in the electric vehicle 10.
  • the battery 62 may be arranged in a space between the pair of left and right underframe portions 30L and 30R.
  • the vehicle body cover 24 is a cover that covers the vehicle body frame 22 and the like, and includes a front cover 68, a handle cover 70, a leg shield 72, floor side covers 74L and 74R, a seat lower cover 76, rear side covers 78L and 78R, and the like.
  • the front cover 68 covers the front end of the body frame 22 such as the head pipe 26 from the front.
  • the handle cover 70 covers the left and right central portions of the handle 44 above the front cover 68.
  • the leg shield 72 is connected to the front cover 68 and covers the head pipe 26 and the down pipe 28 from behind.
  • the seat lower cover 76 covers the space below the seat 12 from the front.
  • the pair of left and right floor side covers 74L and 74R are connected to the leg shield 72 and the seat lower cover 76, and cover the pair of left and right underframe portions 30L and 30R from both left and right sides.
  • the rear side covers 78L and 78R are connected to the rear edge of the seat lower cover 76, and cover the PCU 66 and the like from both left and right sides.
  • a main stand 80 is provided beside the swing arm 18.
  • a shaft 82 of the main stand 80 is provided below the swing arm 18, and the main stand 80 is moved so that a part of the main stand 80 is housed in a recess 84 in which the left side of the swing arm 18 is recessed. Will be arranged.
  • a side stand 86 is disposed near the left rising portion 34L.
  • the first configuration is that the motor 20 is configured as an assembly (unit) in which a stator 90 and a rotor 92 as a driving unit of the motor 20 are incorporated in a motor case 94, and the motor 20 is housed in the swing arm 18. , Constituting a swing type power unit.
  • a stator 90 and a rotor 92 as a driving unit of the motor 20 are incorporated in a motor case 94, and the motor 20 is housed in the swing arm 18.
  • Constituting a swing type power unit In other words, simply mounting the completed motor 20 in which the stator 90 and the rotor 92 are housed and the motor shaft 96 is exposed from the motor case 94 in the swing arm 18, attaches the motor 20 to the swing arm 18. The work is completed.
  • the configuration of the swing arm 18 that houses the motor 20 will be described in more detail.
  • the swing arm 18 has a swing arm body 98.
  • the swing arm body 98 is a hollow member, and has one end 98a extending in the vehicle width direction in a space near the pivot shaft 54 in front of the rear wheel 16, and a connection extending rearward from the left side of the one end 98a.
  • One end 98a of the swing arm body 98 constitutes the front end of the swing arm 18 and is supported by the pivot shaft 54.
  • the pivot shaft 54 is supported by the vehicle body frame 22 via the connection support portion 50.
  • the connection supporting portion 50 extends in the vehicle width direction and connects the pair of left and right rising portions 34L and 34R, and extends rearward from the pipe 50b.
  • four pivot brackets 50a that support the pivot shaft 54.
  • Two protrusions 98 e extend forward from both left and right sides of one end 98 a of the swing arm body 98 toward the pivot shaft 54.
  • the two protrusions 98e are supported by the pivot shaft 54 via two bearings 100 provided at both ends of the pivot shaft 54 in the vehicle width direction.
  • the connecting portion 98b of the swing arm body 98 gradually expands from the front to the rear as viewed from the side in FIGS. 1, 3, and 4.
  • the motor housing 98 c and the other end 98 d of the swing arm main body 98 constitute a rear end of the swing arm 18.
  • the motor accommodating portion 98c is formed in a substantially circular shape in a side view in FIGS. 1, 3 and 4, and is formed so as to be recessed inward in the vehicle width direction in a sectional view in FIG.
  • the rear cushion 56 is connected to the other end 98d of the swing arm body 98.
  • the rear part of the connecting part 98b and the motor housing part 98c are open to the left. This opening is opened to a size that can receive the motor 20 and is covered with the swing arm cover 102 from the left.
  • the swing arm cover 102 is attached to the swing arm body 98 by a plurality of bolts 104. 3 to 5 show a state in which the swing arm cover 102 is removed from the swing arm body 98.
  • the motor 20 accommodated in the motor accommodating portion 98c is, for example, a three-phase AC motor, and includes a stator 90, a rotor 92, and a motor case 94 accommodating the stator 90 and the rotor 92 therein.
  • the motor case 94 is an outer box of the motor case 94, and serves as a stator support portion 94a as a cylindrical housing extending in the vehicle width direction and a rotor cover for closing two openings at both ends in the vehicle width direction of the stator support portion 94a. And left and right rotor support portions 94L and 94R.
  • the stator 90 has a cylindrical stator core 90a made of a laminated steel plate.
  • a plurality of slots 90b are formed in the stator core 90a at predetermined angular intervals in the circumferential direction of the motor 20.
  • a coil 90c is wound around the plurality of slots 90b.
  • the stator support portion 94a is a stator holder that supports the outer peripheral surface of the stator core 90a, that is, the radial outer surface of the motor 20 in the stator 90 in a fixed state. Thereby, the mechanical strength of the stator core 90a made of the laminated steel sheet is reinforced.
  • the stator core 90a is fixed to the stator support 94a by shrink fitting, for example.
  • a rotor 92 is disposed radially inward of the stator 90.
  • the rotor 92 has a cylindrical rotor core 92a made of a laminated steel plate.
  • a plurality of slots 92b are formed in the rotor core 92a in the circumferential direction of the motor 20 at predetermined angular intervals.
  • Magnets 92c are arranged in the plurality of slots 92b.
  • a motor shaft 96 extends through the center of the rotor core 92a in the vehicle width direction. The motor shaft 96 extends in the vehicle width direction through an opening formed at the center of the two rotor support portions 94L and 94R.
  • the motor shaft 96 is supported by two rotor supporting portions 94L and 94R via bearings 106L and 106R provided in the two openings. That is, the rotor 92 is rotatably supported by the two rotor supporting portions 94L and 94R via the motor shaft 96 and the two bearings 106L and 106R.
  • the left end portion 96L of the motor shaft 96 projects outward (leftward) in the vehicle width direction from the left rotor support portion 94L.
  • a portion where the left end portion 96L of the motor shaft 96 projects is formed as a concave portion 108 that is recessed inward in the vehicle width direction.
  • the recess 108 is covered by a cover member 110 from the left. Therefore, even if the swing arm cover 102 is removed from the swing arm body 98, the left end portion 96L of the motor shaft 96 is not exposed (see FIGS. 3 and 5).
  • a rotation angle detection unit 112 for detecting the rotation angles of the rotor 92 and the motor shaft 96 is provided in an internal space formed by the recess 108 and the cover member 110.
  • the rotation angle detector 112 is a resolver, which is a resolver rotor 112a attached to the left end 96L of the motor shaft 96, and a resolver stator 112b fixed to the left rotor support 94L so as to face the resolver rotor 112a. Having. Since the resolver is well known, a detailed description thereof will be omitted.
  • the right end (tip) 96R of the motor shaft 96 protrudes inward (rightward) in the vehicle width direction from the right rotor support 94R so as to be directed to the motor housing 98c of the swing arm body 98. Therefore, the right rotor support 94R and the right portion of the stator support 94a are opposed to the motor housing 98c.
  • a speed reducer housing 116 for housing a speed reducer 114 described later is provided on the right side of the motor housing 98c of the swing arm body 98.
  • the right end 96R of the motor shaft 96 is inserted into the reduction gear housing 116 and is supported by a bearing 118 provided in the reduction gear housing 116.
  • the right end portion 96R of the motor shaft 96 is splined.
  • a motor-side gear 120 (gear) for rotating an axle (output shaft) 16a of the rear wheel 16 is inserted into the splined portion.
  • a washer 122 is interposed between the motor-side gear 120 and the bearing 118 to prevent the motor-side gear 120 from coming off.
  • the washer 122 is desirably a low-pressure press-fitted washer with respect to the motor shaft 96 so that the motor 20 can be exchanged into the motor accommodating portion 98c. Since the washer 122 has a low press fit, the assembling is easy.
  • a plurality of screw holes (first through hole, second through hole) 124 extending in the vehicle width direction are formed at predetermined angular intervals in the circumferential direction of the motor 20 in the two rotor support portions 94L, 94R and the stator support portion 94a. Have been.
  • a plurality of bolts 126 and 128 are screwed into these screw holes 124. As shown in FIGS. 3 to 5, in this embodiment, nine screw holes 124 are formed.
  • a bolt 126 having a short length is screwed into the three screw holes 124.
  • the short bolt 126 is used for fixing the rotor supports 94L and 94R to the stator support 94a. As shown in FIG. 5, the short bolt 126 is inserted into the screw hole 124 from the left side, thereby fastening and fixing the rotor support 94L and the stator support 94a to the rotor support 94R.
  • long bolts (fixing means) 128 are screwed into the other six screw holes 124.
  • the long bolt 128 is used for fixing the motor case 94 including the two rotor supports 94L and 94R and the stator support 94a to the motor housing 98c. That is, the long bolt 128 is inserted into the screw hole 124 from the left side, and screwed into the bolt hole 130 provided in the motor housing 98c, so that the rotor support 94L, the stator support 94a, and the rotor support The 94R is fastened and fixed to the motor housing 98c.
  • the number and position of the screw holes 124 and the types and numbers of the bolts 126 and 128 to be screwed into the respective screw holes 124 are arbitrary, and the design may be changed according to the specifications of the swing arm 18 and the motor 20 and the like. Of course it is good.
  • the motor 20 is attached to the motor housing 98c of the swing arm body 98.
  • the motor 20 includes a motor case 94 in which the stator 90 and the rotor 92 are housed in a motor case 94, and a right end portion 96R of the motor shaft 96 protrudes from the right rotor support portion 94R.
  • the bolt 126 having a short length fixes the rotor support portions 94L and 94R and the stator support portion 94a in a state of permanent fastening, while the long bolt 128 may be temporarily fastened.
  • the right end portion 96R of the motor shaft 96 is inserted into the reduction gear accommodating portion 116 and is supported by the bearing 118.
  • the right end portion 96R of the motor 20 may be supported by the bearing 118 in a state where the motor side gear 120 and the washer 122 are fitted into the splined portion on the right end portion 96R side of the motor shaft 96.
  • the motor case 94 is fixed to the motor housing 98c.
  • the motor 20 is housed in the motor housing 98c, and the work of attaching the motor 20 to the swing arm 18 is completed.
  • the second configuration is a configuration for efficiently cooling the motor 20 by exposing a part of the motor 20 housed in the motor housing portion 98c to the outside.
  • the swing arm cover 102 has an exposed portion 132 as an opening for exposing a part of the motor case 94 to the outside.
  • the exposed portion 132 is directed from the front to the rear at a position corresponding to the motor housing portion 98c of the swing arm cover 102 so as to expose the rear portion of the motor case 94 to the outside.
  • the exposed portion 132 is opened so as to have a constant width in the vehicle width direction, and exposes the motor case 94 to the outside in the vehicle width direction.
  • the arc-shaped exposed portion 132 becomes wider in the vertical direction as going from the front to the rear, and the exposed area gradually increases.
  • the swing arm cover 102 has a circular portion 102a that covers the central portion of the motor case 94, that is, the motor shaft 96 and the rotation angle detector 112 (see FIG. 5) from the left side when viewed from the side in FIG.
  • the circular portion 102a and the rear end portion 102b of the swing arm cover 102 are connected by a connecting portion 102c extending in the front-rear direction.
  • the exposed portion 132 is provided so as to correspond to the slot 90b around which the coil 90c is wound.
  • the exposed portion 132 exposes a part of the motor case 94 to the outside so that the plurality of bolts 126 and 128 are covered by the swing arm cover 102. .
  • the motor 20 is a three-phase AC motor. As described later, the motor 20 is driven to rotate by supplying AC power to the coil 90c from the PCU 66 via the power supply line 134 as a three-phase line. In this case, the power supply line 134 is drawn forward from the motor 20. Therefore, the swing arm cover 102 and the swing arm body 98 cover the power supply line 134 from the front and side.
  • the third configuration relates to the routing of the power supply line 134 from the motor 20 and the routing of the communication line 136 from the rotation angle detection unit 112.
  • a through hole 138 that opens forward is formed at one end 98 a of the swing arm main body 98 at a location in front of the rear wheel 16.
  • the through hole 138 is formed at one end 98 a of the swing arm body 98 above the pivot shaft 54 and at a location between the two bearings 100.
  • the power supply line 134 is a rigid three-phase wire harness as shown in FIGS. 3, 4, 6, and 7, and is routed inside the swing arm 18 along the internal shape of the swing arm 18.
  • the power supply line 134 extends forward from the motor 20 inside the swing arm 18, bends inward in the vehicle width direction at one end 98 a of the swing arm body 98, and extends forward from the through hole 138 to the front of the swing arm 18.
  • the power supply line 134 extends forward of the swing arm 18 through the through hole 138 between the two bearings 100 above the pivot shaft 54.
  • the power supply line 134 drawn out from the through hole 138 is routed above the pivot shaft 54 and connected to the PCU 66 disposed diagonally below and behind the battery 62. Therefore, the PCU 66 and the motor 20 exchange AC power via the power supply line 134.
  • a communication line 136 is drawn from the rotation angle detection unit 112.
  • the communication line 136 is a harness having lower rigidity than the power supply line 134. Therefore, the communication line 136 is easier to route than the power supply line 134, and extends forward from the rotation angle detection unit 112 in the swing arm 18 so as to crawl along the power supply line 134. It is bent inward in the vehicle width direction at the portion 98a, and extends forward of the swing arm 18 from the through hole 138. Therefore, the communication line 136 also extends forward of the swing arm 18 through the through hole 138 between the two bearings 100 above the pivot shaft 54. Then, the communication line 136 drawn from the through hole 138 is routed above the pivot shaft 54 and connected to the PCU 66. Therefore, the PCU 66 and the rotation angle detection unit 112 can transmit and receive the detection results of the rotation angles of the rotor 92 and the motor shaft 96 via the communication line 136.
  • the power supply line 134 and the communication line 136 are bound by a binding member 140 such as a grommet, and the stay 142 connects the inside of the connecting portion 98 b. (See FIGS. 6 and 7).
  • FIGS. 6 and 7 show, as an example, a case where the hole 144 is formed at a position near the through hole 138 on the bottom of the swing arm body 98.
  • the strength of the swing arm body 98 is provided between the through hole 138 and the motor accommodating portion 98c, specifically, at a position from the rear portion of the connecting portion 98b to the motor accommodating portion 98c.
  • a plurality of ribs 146 for reinforcement are provided.
  • the swing arm 18 is further provided with a speed reducer accommodating portion 116 that is attached to the inside of the swing arm body 98 in the vehicle width direction and houses the speed reducer 114.
  • a brake mechanism 150 is provided inside the reduction gear housing 116 in the vehicle width direction and inside the wheel 16 b of the rear wheel 16. Therefore, around the rear wheel 16, the motor 20, the speed reducer 114, and the brake mechanism 150 are sequentially arranged from the left side to the right side in the vehicle width direction.
  • a gear case cover 154 is fixed to the right side of the motor housing portion 98c of the swing arm body 98 by bolts 152.
  • the internal space formed by the motor housing 98c and the gear case cover 154 is configured as the reduction gear housing 116.
  • the speed reducer 114 is mounted on the motor shaft 96, an intermediate shaft 156 disposed behind the motor shaft 96 and extending in the vehicle width direction, mounted on the intermediate shaft 156, and meshed with the motor gear 120. And an output gear 162 mounted on the axle 16a of the rear wheel 16 disposed behind the intermediate shaft 156 and meshing with a gear 160 formed on the left side of the intermediate shaft 156 in the vehicle width direction. And
  • the right end of the intermediate shaft 156 is supported by a bearing 164R disposed on the gear case cover 154.
  • the left end of the intermediate shaft 156 is supported by a bearing 164L disposed on the right side of the motor housing 98c.
  • the left end of the axle 16a is supported by a bearing 166L disposed on the right side of the motor housing 98c.
  • the right end of the axle 16a is exposed to the outside through the gear case cover 154 and is connected to the wheel 16b of the rear wheel 16.
  • the right end side of the axle 16a is supported by a bearing 166R arranged on the gear case cover 154.
  • the speed reducer 114 reduces the rotation speed of the motor shaft 96 by the intermediate gear 158, and drives the axle 16a and the rear wheel 16 to rotate.
  • the brake mechanism 150 is a drum brake, and includes a drum 150a provided inside the wheel 16b, two shoes 150b arranged on both sides of the axle 16a, and a lining arranged on the drum 150a side of the shoe 150b. 150c.
  • the lining 150c of the two shoes 150b presses the drum 150a, respectively.
  • the rotation of the wheel 16b (rear wheel 16) on which the drum 150a is mounted can be braked. Since the drum brake is well known, a detailed description thereof will be omitted.
  • the swing arm 18 is provided with a breather tube 148 extending from the reduction gear housing 116 (see FIGS. 2 to 4, 8, and 9).
  • the breather tube 148 is provided above the reduction gear housing 116. Therefore, the breather tube 148 is disposed between the motor 20 and the rear wheel 16 as in the case of the reduction gear housing 116.
  • One end 148a which is the inlet of the breather tube 148, is fixed to the gear case cover 154 and communicates with the reduction gear housing 116.
  • the other end 148b which is the outlet of the breather tube 148, is disposed above the swing arm 18 on a fender 60 that can swing together with the swing arm 18.
  • the other end 148b of the breather tube 148 is fixed to the fender 60 by inserting the other end 148b of the breather tube 148 into a cylindrical fixing portion 168 provided on the left side surface of the fender 60. Therefore, the breather tube 148 is arranged with one end 148a (entrance) directed downward and the other end 148b (exit) directed upward.
  • an upper wall 170 extending in the front-rear direction is formed above the reduction gear housing 116 on the right side of the motor housing 98 c.
  • the breather tube 148 extends upward from the reduction gear housing 116, bends forward along the upper wall 170, bends upward at the front end of the upper wall 170, and extends to the fixing portion 168 of the fender 60.
  • the upper wall 170 is inclined such that the other end 148b of the breather tube 148 is higher than the one end 148a. Therefore, in the breather tube 148, the intermediate portion 148c disposed on the upper wall 170 is inclined and disposed on the upper wall 170 so as to gradually increase toward the front.
  • the upper wall 170 is provided with a fixing portion 172 such as a projection for projecting upward to fix the breather tube 148 to the upper wall 170 and the right side of the motor accommodating portion 98c.
  • a plate member 174 extending vertically and in the front-rear direction is integrally formed on the front side surface of the fender 60.
  • the other end 148b (outlet) of the breather tube 148 is disposed on the left side of the plate member 174. Therefore, the plate member 174 is disposed between the breather tube 148 and the rear wheel 16.
  • one end 148a (entrance) of the breather tube 148 is disposed between the motor shaft 96 and the axle 16a, more specifically, between the intermediate shaft 156 and the axle 16a.
  • the vehicle body frame 22 a pivot shaft 54 provided on the vehicle body frame 22, a front end (one end) is pivotally supported by the pivot shaft 54, and a rear end (the other end).
  • a swing arm 18 that supports the rear wheel 16
  • a motor 20 that is disposed on the swing arm 18 and drives the rear wheel 16.
  • the electric vehicle 10 further includes a motor housing 98 c provided on the swing arm 18 and housing the motor 20.
  • the motor 20 includes a stator 90, a rotor 92, and a motor case 94 that houses the stator 90 in a fixed state therein, while rotatably houses the rotor 92 therein.
  • the portion facing the portion 98c is fixed to the motor housing 98c.
  • the motor 20 is arranged on the swing arm 18 only by fixing the motor case 94 in which the stator 90 and the rotor 92 are accommodated to the motor accommodating portion 98c. Can be improved.
  • a screw hole (first through hole) 124 is formed in the motor case 94 so as to face the motor housing portion 98c.
  • the motor case 94 has rotor support portions 94L and 94R that rotatably support the rotor 92 and a stator support portion 94a that supports the radial outer surface of the motor 20 in the stator 90.
  • the stator support portion 94a and the rotor support portions 94L and 94R function as a part of the motor case 94, the number of parts of the motor 20 can be reduced.
  • screw holes (second through holes) 124 are formed in the rotor support portions 94L and 94R and the stator support portion 94a so as to be directed to the motor accommodating portion 98c, and a part of the rotor support portion 94R and a part of the stator support portion 94a are formed. It is configured as an opposing portion. In this case, by inserting the bolt 128 into the screw hole 124, the facing portion is fixed to the motor housing 98c. Thus, the motor case 94 can be easily fixed to the motor housing 98c while reducing the number of parts of the motor 20.
  • a motor shaft 96 projecting from the motor case 94 is supported by the rotor 92 such that a right end (tip) 96R is directed to the motor accommodating portion 98c.
  • the right end 96R of the motor shaft 96 is rotatably supported by a bearing 118 provided on the side of the motor housing 98c.
  • the motor shaft 96 can be favorably supported by the motor housing 98c.
  • a spline process is performed on the right end portion 96R side of the motor shaft 96, and a motor-side gear (gear) 120 for driving the axle 16a of the rear wheel 16 is inserted into the spline processed portion.
  • a washer 122 is provided between the motor-side gear 120 and the bearing 118 to prevent the motor from being disengaged.
  • the motor-side gear 120 can be prevented from coming off the motor shaft 96.
  • the electric vehicle 10 further includes a motor accommodating portion 98c provided on the swing arm 18 and accommodating the motor 20.
  • the motor 20 has a motor case 94 that houses a stator 90 and a rotor 92 that are driving units of the motor 20.
  • the swing arm 18 has a swing arm cover 102 provided with an exposed part 132 for exposing a part of the motor case 94 to the outside.
  • the heat of the motor 20 is radiated to the outside through the exposed portion 132 provided on the swing arm cover 102.
  • the motor 20 housed in the motor housing 98c of the swing arm 18 can be efficiently cooled.
  • the electric vehicle 10 further includes a power supply line 134 for supplying power to the motor 20.
  • the swing arm cover 102 covers the power supply line 134.
  • the power supply line 134 is disposed in front of the motor 20, and the swing arm cover 102 covers the power supply line 134 from the front.
  • the power supply line 134 can be protected from stepping stones and the like from the front while the electric vehicle 10 is traveling.
  • the motor 20 is a three-phase AC motor
  • the power supply line 134 may be a three-phase line that supplies power to the AC motor.
  • the electric vehicle 10 can be suitably driven.
  • the exposed part 132 exposes the rear part of the motor case 94 to the outside.
  • the motor 20 can be cooled while protecting the power supply line 134 from a stepping stone or the like from the front.
  • the exposed portion 132 exposes the motor case 94 to the outside in the vehicle width direction of the electric vehicle 10. Thereby, the cooling efficiency of the motor 20 can be further improved.
  • the exposed portion 132 becomes wider toward the rear of the electric vehicle 10. Therefore, the cooling efficiency of the motor 20 can be improved while protecting the inside of the swing arm 18 from stepping stones or the like from the front.
  • the swing arm cover 102 covers the central part of the motor case 94 in a side view. Thereby, the rotation angle detection unit 112, the motor shaft 96, and the like can be protected.
  • the exposed portion 132 is formed in an arc shape in a side view. Thereby, the stator 90 constituting the motor 20 can be efficiently cooled.
  • a driving portion of the motor 20 is constituted by a stator 90 fixed inside the motor case 94 and a rotor 92 rotatably supported inside the motor case 94. Therefore, in the second configuration, the stator 90 and the rotor 92 can be appropriately cooled.
  • the exposed portion 132 is formed on the stator 90 in a side view, and is provided so as to correspond to the slot 90b around which the coil 90c is wound. Thereby, cooling of stator 90 can be performed more efficiently. That is, the coil 90c is a component that generates the largest amount of heat in the motor 20 because the coil 90c is energized by the power supplied from the power supply line 134. Therefore, by providing the exposed portion 132 corresponding to the coil 90c, the stator 90 can be cooled more efficiently.
  • the motor 20 is housed in the motor housing 98c by fixing the motor case 94 to the motor housing 98c via a bolt (fixing means) 128.
  • the exposed part 132 exposes a part of the motor case 94 to the outside so that the bolt 128 is covered by the swing arm cover 102.
  • the motor 20 can be cooled while the design of the electric vehicle 10 is improved by hiding the bolt 128.
  • the electric vehicle 10 further includes a motor accommodating portion 98 c that is provided on the side of the rear wheel 16 in the swing arm 18 and accommodates the motor 20, and a power supply line 134 that supplies power to the motor 20.
  • a through hole 138 is formed at the front end (one end 98 a) of the swing arm 18 at a location in front of the rear wheel 16.
  • the power supply line 134 extends forward from the motor 20 in the swing arm 18, bends at one end 98 a in the vehicle width direction of the electric vehicle 10, and extends from the through hole 138 to the outside of the swing arm 18.
  • the power supply line 134 extends from the motor 20 through the inside of the swing arm 18 to the outside through the through hole 138 formed in the one end 98a.
  • the power supply line 134 can be provided more linearly without being bent so much.
  • the degree of exposure of the power supply line 134 to the outside is reduced, the number of components for protecting the power supply line 134 externally can be reduced and the appearance can be improved.
  • a space above or below the swing arm 18 is secured, a space for mounting the battery 62 above the pivot shaft 54 can be secured, for example. As a result, the minimum ground clearance of the swing arm 18 can be secured.
  • Two bearings 100 are provided at both ends of the pivot shaft 54 in the vehicle width direction.
  • One end 98a is pivotally supported by the pivot shaft 54 via two bearings 100.
  • the through hole 138 is formed at a position between the two bearings 100 at the one end 98 a, and the power supply line 134 extends to the outside of the swing arm 18 through the through hole 138 between the two bearings 100.
  • the power supply line 134 is exposed to the outside in the vehicle width direction, not in the vehicle width direction.
  • contact of the power supply line 134 with the road surface is avoided, so that the bank angle of the electric vehicle 10 can be secured.
  • the through hole 138 is formed at a position above the pivot shaft 54 at the one end 98a, and the power supply line 134 extends outside the swing arm 18 from above the pivot shaft 54 via the through hole 138. Thereby, the minimum ground clearance of the electric vehicle 10 including the swing arm 18 can be secured.
  • a rib 146 is provided between the through hole 138 in the swing arm 18 and the motor housing 98c. Thereby, the mechanical strength of the swing arm 18 can be reinforced.
  • the electric vehicle 10 further includes a rotation angle detection unit 112 that is disposed on the motor 20 and detects a rotation angle of the motor 20, and a communication line 136 extending from the rotation angle detection unit 112.
  • the communication line 136 extends forward from the rotation angle detection unit 112 in the swing arm 18 so as to crawl along the power supply line 134, bends inward in the vehicle width direction at one end 98 a, 18 extend outside. Thereby, the bending inside the swing arm 18 together with the power supply line 134 can be reduced, and the appearance can be improved while avoiding exposure to the outside.
  • the electric vehicle 10 further includes a stay 142 for fixing the power supply line 134 to the swing arm 18 in the swing arm 18.
  • the power supply line 134 linearly arranged inside the swing arm 18 can be held.
  • a hole 144 for draining water is formed at the bottom of the swing arm 18.
  • the liquid that has entered the swing arm 18 through the through hole 138 drops downward through the hole 144.
  • the electric vehicle 10 further includes a battery 62 and a PCU (electronic component) 66 supported by the body frame 22.
  • the power supply line 134 is drawn out of the through-hole 138 and connected to the PCU 66.
  • the PCU 66 supplies the electric power supplied from the battery 62 to the motor 20 via the power supply line 134.
  • electric power can be supplied from the PCU 66 to the motor 20 to drive the motor 20.
  • the motor 20 is an AC motor
  • the power supply line 134 is a three-phase line that supplies power to the AC motor
  • the electric vehicle 10 includes a speed reducer 114 that transmits the driving force of the motor 20 to the rear wheel 16, a speed reducer housing 116 that is provided on the swing arm 18 and houses the speed reducer 114, A breather tube 148 extending from the storage section 116. One end 148 a of the breather tube 148 communicates with the reduction gear housing 116. The other end 148 b of the breather tube 148 is disposed above the swing arm 18 on a fender 60 (a component of the electric vehicle 10) that can swing together with the swing arm 18.
  • the lubricating oil liquefied in the breather tube 148 returns to the reduction gear housing 116 via the one end 148a of the breather tube 148.
  • the liquefied lubricating oil is not discharged to the outside, so that the electric vehicle 10 and the like can be prevented from being contaminated.
  • the reduction gear housing 116 and the breather tube 148 are arranged between the motor 20 and the rear wheel 16. Thereby, the space between the motor 20 and the rear wheel 16 can be effectively utilized.
  • the breather tube 148 is arranged along the upper wall 170 provided near the speed reducer housing 116 of the swing arm 18.
  • the breather tube 148 can be cooled by the traveling wind while protecting the breather tube 148 from flying stones or the like while the electric vehicle 10 is traveling. Further, by arranging the breather tube 148 in the upper wall 170, even if the breather tube 148 flaps due to vibration during traveling, it can be prevented from contacting the rear wheel 16.
  • the upper wall 170 is inclined so that the other end 148b of the breather tube 148 is higher than the one end 148a.
  • the upper wall 170 is provided with a fixing portion 172 for fixing the breather tube 148 to the swing arm 18 and the upper wall 170. Thereby, the breather tube 148 can be prevented from being caught in the rear wheel 16.
  • the breather tube 148 is arranged with the other end 148b, which is the outlet, directed upward. Accordingly, it is possible to reliably prevent the lubricating oil from being discharged from the outlet of the breather tube 148 to the outside.
  • the breather tube 148 is disposed with the one end 148a, which is the entrance, directed downward.
  • the lubricating oil liquefied in the breather tube 148 can be reliably returned to the reduction gear housing 116.
  • the other end 148b which is the outlet of the breather tube 148, is disposed on the side surface of the fender 60.
  • the other end 148b of the breather tube 148 can be easily fixed.
  • a plate member 174 is disposed between the breather tube 148 and the rear wheel 16.
  • the plate member 174 is formed integrally with the fender 60. Thereby, the plate member 174 can be easily provided.
  • one end 148a which is an inlet of the breather tube 148, is provided between a motor shaft 96 of the motor 20 and an axle (output shaft) 16a that transmits a driving force from the motor shaft 96 to the rear wheel 16.
  • an axle (output shaft) 16a that transmits a driving force from the motor shaft 96 to the rear wheel 16.
  • the inlet of the breather tube 148 is provided between the axle 16a and the intermediate shaft 156 of the speed reducer 114 that transmits the driving force from the motor shaft 96 to the axle 16a.
  • the gas containing the mist-like lubricating oil can be more efficiently discharged to the outside.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • General Details Of Gearings (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

An electric vehicle (10) is provided with: a speed reducer housing part (116) mounted on a swing arm (18) and housing a speed reducer (114); and a breather tube (148) extending from the speed reducer housing part (116). One end portion (148a) of the breather tube (148) communicates with the speed reducer housing part (116). The other end portion (148b) of the breather tube (148) is placed on a fender (60), which is swingable together with the swing arm (18), above the swing arm (18).

Description

電動車両Electric vehicle
　本発明は、ピボット軸に軸支されたスイングアームにモータ及び減速機が配置された電動車両に関する。 The present invention relates to an electric vehicle in which a motor and a speed reducer are arranged on a swing arm pivotally supported by a pivot shaft.
　特許第５５５９９３９号公報には、車体フレームと、車体フレームに設けられたピボット軸と、一端部がピボット軸に軸支されるスイングアームと、スイングアームの他端部に支持される後輪と、スイングアームの内部に配置され、後輪を駆動するモータと、モータの駆動力を後輪に伝達する減速機とを備える電動車両が開示されている。この場合、スイングアームに設けられたギヤケース（減速機収容部）に減速機が収容され、ギヤケースからブリーザホース（ブリーザチューブ）が延出している。ブリーザホースは、下向きに開口するようにギヤケースの周辺に配置されている。 Japanese Patent No. 5559939 discloses a vehicle body frame, a pivot shaft provided on the vehicle body frame, a swing arm having one end pivotally supported by the pivot shaft, and a rear wheel supported by the other end of the swing arm. An electric vehicle including a motor arranged inside a swing arm and driving a rear wheel, and a reduction gear transmitting the driving force of the motor to the rear wheel is disclosed. In this case, the reduction gear is accommodated in a gear case (reduction gear accommodation part) provided in the swing arm, and a breather hose (breather tube) extends from the gear case. The breather hose is arranged around the gear case so as to open downward.
　ブリーザチューブは、減速機収容部内の温度上昇に起因して、減速機収容部内の圧力（内圧）が上昇することにより、減速機に用いられる潤滑油が揮発した際に、霧状の潤滑油を含む気体を外部に排出して内圧を低下させるために設けられる。この場合、ブリーザチューブは、外部に露出しているため、当該気体を外部に排気する際、気体が冷却されて液化すると、液化した潤滑油が開口から外部に排出される。この結果、電動車両等が汚れることが懸念される。 When the pressure (internal pressure) inside the reduction gear housing rises due to the rise in temperature inside the reduction gear housing, the breather tube removes mist-like lubrication oil when the lubrication oil used for the reduction gear evaporates It is provided to reduce the internal pressure by discharging the contained gas to the outside. In this case, since the breather tube is exposed outside, when the gas is exhausted to the outside, when the gas is cooled and liquefied, the liquefied lubricating oil is discharged from the opening to the outside. As a result, there is a concern that the electric vehicle and the like may become dirty.
　そこで、本発明は、ブリーザチューブから排出される潤滑油で汚れることを回避することができる電動車両を提供することを目的とする。 Therefore, it is an object of the present invention to provide an electric vehicle that can avoid contamination with lubricating oil discharged from a breather tube.
　本発明の態様は、車体フレームと、前記車体フレームに設けられたピボット軸と、一端部が前記ピボット軸に軸支され、他端部が後輪を支持するスイングアームと、前記スイングアームに配置され、前記後輪を駆動するモータと、前記モータの駆動力を前記後輪に伝達する減速機とを備える電動車両であって、前記スイングアームに設けられ、前記減速機を収容する減速機収容部と、前記減速機収容部から延出するブリーザチューブとをさらに備え、前記ブリーザチューブの一端部は、前記減速機収容部に連通し、前記ブリーザチューブの他端部は、前記スイングアームの上方で、前記スイングアームと共に揺動可能な前記電動車両の部品に配置されている。 According to an aspect of the present invention, there is provided a vehicle body frame, a pivot shaft provided on the vehicle body frame, a swing arm having one end pivotally supported by the pivot shaft and the other end supporting a rear wheel, and the swing arm. An electric vehicle comprising: a motor that drives the rear wheel; and a speed reducer that transmits a driving force of the motor to the rear wheel, wherein the speed reducer is provided on the swing arm and houses the speed reducer. And a breather tube extending from the speed reducer housing portion, one end of the breather tube communicates with the speed reducer housing portion, and the other end of the breather tube extends above the swing arm. And is disposed on a part of the electric vehicle that can swing with the swing arm.
　本発明によれば、ブリーザチューブの他端部が上向きに配置されているので、ブリーザチューブ内で液化した潤滑油は、ブリーザチューブの一端部を介して減速機収容部に戻る（落下する）。これにより、液化した潤滑油が外部に排出されることはないので、電動車両等が汚れることを回避することができる。 According to the present invention, since the other end of the breather tube is arranged upward, the lubricating oil liquefied in the breather tube returns (falls) to the reduction gear housing via one end of the breather tube. As a result, the liquefied lubricating oil is not discharged to the outside, so that the electric vehicle or the like can be prevented from becoming dirty.
本実施形態に係る電動車両の左側面図である。FIG. 2 is a left side view of the electric vehicle according to the embodiment. 図１の電動車両の後輪周辺を左後方から見た斜視図である。FIG. 2 is a perspective view of the vicinity of rear wheels of the electric vehicle in FIG. 1 as viewed from the rear left. 図１及び図２のスイングアームカバーを外した状態の左側面図である。FIG. 3 is a left side view in a state where a swing arm cover of FIGS. 1 and 2 is removed. 図３の左側のロータ支持部を外した状態の左側面図である。FIG. 4 is a left side view of a state where a left rotor support portion of FIG. 3 is removed. 図３のＶ－Ｖ線に沿った断面図である。FIG. 5 is a sectional view taken along line VV in FIG. 3. スイングアーム等を破断して図示した右側面図である。FIG. 4 is a right side view showing a swing arm and the like cut away. スイングアームの前端部周辺の底面図である。It is a bottom view around the front end part of a swing arm. 減速機収容部を図示した左側面図である。It is a left view which showed the reduction gear accommodating part. 減速機収容部を含むスイングアーム、ブレーキ機構及びブリーザチューブの斜視図である。It is a perspective view of a swing arm including a reduction gear accommodation part, a brake mechanism, and a breather tube.
　以下、本発明に係る電動車両の好適な実施形態について、添付の図面を参照しながら説明する。 Hereinafter, preferred embodiments of the electric vehicle according to the present invention will be described with reference to the accompanying drawings.
［１．本実施形態に係る電動車両１０の概略構成］
　図１は、本実施形態に係る電動車両１０の左側面図である。なお、以下の説明では、電動車両１０のシート１２に着座した乗員の見た方向に従って、前後、左右及び上下の方向を説明する。また、電動車両１０において、左右一対に配設される構成要素については、左側の構成要素については「Ｌ」、右側の構成要素については「Ｒ」の文字を付けて説明する場合がある。 [1. Schematic configuration of electric vehicle 10 according to present embodiment]
FIG. 1 is a left side view of an electric vehicle 10 according to the present embodiment. In the following description, front and rear, left and right, and up and down directions will be described according to the direction seen by the occupant sitting on the seat 12 of the electric vehicle 10. In the electric vehicle 10, components arranged on a left and right side may be described with a letter "L" for a component on the left and "R" for a component on the right.
　電動車両１０は、低床のフロア部１４を有する電動スクータであり、後輪１６を軸支するスイングアーム１８に内蔵されたモータ２０の駆動力で後輪１６を回転駆動させることにより走行する。なお、本実施形態に係る電動車両１０は、図１の電動スクータに限定されることはなく、モータ２０によって駆動する各種の電動の鞍乗型車両に適用可能である。以下の説明では、スクータ型の電動車両１０について説明する。 The electric vehicle 10 is an electric scooter having a floor portion 14 with a low floor, and runs by rotating and driving the rear wheel 16 with the driving force of a motor 20 built in a swing arm 18 that supports the rear wheel 16. In addition, the electric vehicle 10 according to the present embodiment is not limited to the electric scooter of FIG. 1, and can be applied to various electric saddle-ride type vehicles driven by the motor 20. In the following description, a scooter-type electric vehicle 10 will be described.
　電動車両１０は、車体フレーム２２と、車体フレーム２２を覆う合成樹脂製の車体カバー２４とを有する。車体フレーム２２は、前端部のヘッドパイプ２６と、ヘッドパイプ２６から後ろ斜め下方に延びるダウンパイプ２８と、ダウンパイプ２８の後端から後方に延びる左右一対のアンダーフレーム部３０Ｌ、３０Ｒと、アンダーフレーム部３０Ｌ、３０Ｒの後端から後ろ斜め上方に延びるサイドフレーム部３２Ｌ、３２Ｒとから構成される。サイドフレーム部３２Ｌ、３２Ｒは、左右一対のアンダーフレーム部３０Ｌ、３０Ｒから後ろ斜め上方に延びる立ち上げ部３４Ｌ、３４Ｒと、左右一対の立ち上げ部３４Ｌ、３４Ｒから後方に延出するリヤフレーム３６Ｌ、３６Ｒとから構成される。左右一対のリヤフレーム３６Ｌ、３６Ｒの後端は、テールパイプ部３８で連結されている。 The electric vehicle 10 has a vehicle body frame 22 and a vehicle body cover 24 made of synthetic resin that covers the vehicle body frame 22. The vehicle body frame 22 includes a head pipe 26 at a front end, a down pipe 28 extending obliquely rearward and downward from the head pipe 26, a pair of left and right under frame parts 30L and 30R extending rearward from a rear end of the down pipe 28, and an under frame. And side frame portions 32L and 32R extending obliquely rearward and upward from the rear ends of the portions 30L and 30R. The side frame portions 32L, 32R include rising portions 34L, 34R extending diagonally upward and rearward from the pair of left and right underframe portions 30L, 30R, and rear frames 36L extending rearward from the pair of left and right rising portions 34L, 34R. 36R. The rear ends of the pair of left and right rear frames 36L, 36R are connected by a tail pipe portion 38.
　ヘッドパイプ２６には、フロントフォーク４０Ｌ、４０Ｒが操舵自在に取り付けられている。フロントフォーク４０Ｌ、４０Ｒの上部には、ステアリングステム４２を介して、ハンドル４４が取り付けられている。フロントフォーク４０Ｌ、４０Ｒの下端には、前輪４６が取り付けられている。フロントフォーク４０Ｌ、４０Ｒには、前輪４６を上方から覆うフロントフェンダ４８が取り付けられている。 フ ロ ン ト Front forks 40L and 40R are attached to the head pipe 26 so as to be steerable. A handle 44 is attached to the upper portions of the front forks 40L and 40R via a steering stem 42. A front wheel 46 is attached to lower ends of the front forks 40L and 40R. A front fender 48 that covers the front wheel 46 from above is attached to the front forks 40L and 40R.
　アンダーフレーム部３０Ｌ、３０Ｒとサイドフレーム部３２Ｌ、３２Ｒとの間には、ピボットブラケット５０ａを含む連結支持部５０が設けられている。連結支持部５０は、電動車両１０の左右方向（車幅方向）に延びるピボット軸５４を支持する。ピボット軸５４には、スイングアーム１８の前端部（一端部）が軸支されている。スイングアーム１８は、ピボット軸５４から電動車両１０の前後方向に沿って、後輪１６の左側方に延びている。スイングアーム１８の後端部（他端部）は、後輪１６を支持する。 連結 A connection support portion 50 including a pivot bracket 50a is provided between the under frame portions 30L and 30R and the side frame portions 32L and 32R. The connection support 50 supports a pivot shaft 54 extending in the left-right direction (vehicle width direction) of the electric vehicle 10. A front end (one end) of the swing arm 18 is supported by the pivot shaft 54. The swing arm 18 extends from the pivot shaft 54 to the left of the rear wheel 16 along the front-rear direction of the electric vehicle 10. The rear end (the other end) of the swing arm 18 supports the rear wheel 16.
　スイングアーム１８は、後輪１６の左側方にモータ２０が配置されるように、該モータ２０を内蔵する。従って、スイングアーム１８は、スイング式のパワーユニットとして構成される。スイングアーム１８の後端部と左側のリヤフレーム３６Ｌとの間には、リヤクッション５６が連結されている。また、リヤフレーム３６Ｌ、３６Ｒには、後輪１６を上方から覆うリヤフェンダ５８が取り付けられている。さらに、スイングアーム１８には、リヤフェンダ５８と後輪１６との間で後輪１６を上方から直接覆い、且つ、スイングアーム１８と共に揺動可能な他のフェンダ６０が取り付けられている。 The swing arm 18 incorporates the motor 20 so that the motor 20 is disposed on the left side of the rear wheel 16. Therefore, the swing arm 18 is configured as a swing type power unit. A rear cushion 56 is connected between the rear end of the swing arm 18 and the left rear frame 36L. A rear fender 58 that covers the rear wheel 16 from above is attached to the rear frames 36L and 36R. Further, another fender 60 that directly covers the rear wheel 16 from above between the rear fender 58 and the rear wheel 16 and that can swing with the swing arm 18 is attached to the swing arm 18.
　リヤフレーム３６Ｌ、３６Ｒは、乗員が着座するシート１２を下側から支持する。シート１２とピボット軸５４との間で、左右一対の立ち上げ部３４Ｌ、３４Ｒの間の空間には、電動車両１０のバッテリ６２が配置されている。バッテリ６２は、左右一対の立ち上げ部３４Ｌ、３４Ｒ及びリヤフレーム３６Ｌ、３６Ｒと、立ち上げ部３４Ｌ、３４Ｒを前方で連結するパイプ６４とによって支持されている。 The rear frames 36L and 36R support the seat 12 on which the occupant sits from below. A battery 62 of the electric vehicle 10 is disposed in a space between the pair of right and left rising portions 34L and 34R between the seat 12 and the pivot shaft 54. The battery 62 is supported by a pair of left and right rising portions 34L, 34R and rear frames 36L, 36R, and a pipe 64 connecting the rising portions 34L, 34R at the front.
　後輪１６の前方にあって、バッテリ６２の後ろ斜め下方の箇所には、左右の立ち上げ部３４Ｌ、３４Ｒによって支持される電子部品としてのＰＣＵ（パワーコントロールユニット）６６が支持されている。ＰＣＵ６６は、インバータ等を含み構成され、例えば、バッテリ６２から供給される直流電力を交流電力に変換し、変換後の交流電力をモータ２０に供給する。また、ＰＣＵ６６は、モータ２０の回生時には、モータ２０が発電した交流電力を直流電力に変換し、バッテリ６２に充電する。なお、図１に示すバッテリ６２及びＰＣＵ６６の配置箇所は、一例であって、電動車両１０内の他の箇所に配置してもよい。例えば、左右一対のアンダーフレーム部３０Ｌ、３０Ｒの間の空間にバッテリ６２を配置してもよい。 A PCU (power control unit) 66 as an electronic component supported by the left and right rising portions 34L and 34R is supported at a position in front of the rear wheel 16 and obliquely behind the battery 62. The PCU 66 includes an inverter and the like, and converts, for example, DC power supplied from the battery 62 to AC power, and supplies the converted AC power to the motor 20. When the motor 20 is regenerated, the PCU 66 converts the AC power generated by the motor 20 into DC power and charges the battery 62. Note that the locations of the battery 62 and the PCU 66 shown in FIG. 1 are merely examples, and may be located at other locations in the electric vehicle 10. For example, the battery 62 may be arranged in a space between the pair of left and right underframe portions 30L and 30R.
　車体カバー２４は、車体フレーム２２等を覆うカバーであって、フロントカバー６８、ハンドルカバー７０、レッグシールド７２、フロアサイドカバー７４Ｌ、７４Ｒ、シート下カバー７６及びリヤサイドカバー７８Ｌ、７８Ｒ等を有する。フロントカバー６８は、ヘッドパイプ２６等の車体フレーム２２の前端部を前方から覆う。ハンドルカバー７０は、フロントカバー６８の上方で、ハンドル４４の左右中央部を覆う。レッグシールド７２は、フロントカバー６８に接続され、ヘッドパイプ２６及びダウンパイプ２８を後方から覆う。シート下カバー７６は、シート１２下方の空間を前方から覆う。 The vehicle body cover 24 is a cover that covers the vehicle body frame 22 and the like, and includes a front cover 68, a handle cover 70, a leg shield 72, floor side covers 74L and 74R, a seat lower cover 76, rear side covers 78L and 78R, and the like. The front cover 68 covers the front end of the body frame 22 such as the head pipe 26 from the front. The handle cover 70 covers the left and right central portions of the handle 44 above the front cover 68. The leg shield 72 is connected to the front cover 68 and covers the head pipe 26 and the down pipe 28 from behind. The seat lower cover 76 covers the space below the seat 12 from the front.
　左右一対のフロアサイドカバー７４Ｌ、７４Ｒは、レッグシールド７２及びシート下カバー７６に連結され、左右一対のアンダーフレーム部３０Ｌ、３０Ｒを左右両側から覆う。リヤサイドカバー７８Ｌ、７８Ｒは、シート下カバー７６の後縁部に接続され、ＰＣＵ６６等を左右両側から覆う。 The pair of left and right floor side covers 74L and 74R are connected to the leg shield 72 and the seat lower cover 76, and cover the pair of left and right underframe portions 30L and 30R from both left and right sides. The rear side covers 78L and 78R are connected to the rear edge of the seat lower cover 76, and cover the PCU 66 and the like from both left and right sides.
　スイングアーム１８の側方には、メインスタンド８０が配設されている。この場合、スイングアーム１８の下方にメインスタンド８０の軸８２が設けられ、スイングアーム１８の左側部を凹ませた凹部８４にメインスタンド８０の一部が収容されるように、該メインスタンド８０が配設される。また、左側の立ち上げ部３４Ｌの近傍には、サイドスタンド８６が配設されている。 メ イ ン A main stand 80 is provided beside the swing arm 18. In this case, a shaft 82 of the main stand 80 is provided below the swing arm 18, and the main stand 80 is moved so that a part of the main stand 80 is housed in a recess 84 in which the left side of the swing arm 18 is recessed. Will be arranged. In addition, a side stand 86 is disposed near the left rising portion 34L.
［２．本実施形態の特徴的な構成］
　次に、本実施形態に係る電動車両１０の特徴的な構成（第１～第４の構成）について、図１～図９を参照しながら説明する。 [2. Characteristic configuration of the present embodiment]
Next, a characteristic configuration (first to fourth configurations) of the electric vehicle 10 according to the present embodiment will be described with reference to FIGS.
＜２．１　第１の構成＞
　第１の構成は、モータ２０の駆動部としてのステータ９０及びロータ９２をモータケース９４に組み込んだ組立体（ユニット）として該モータ２０が構成され、モータ２０をスイングアーム１８内に収容することで、スイング式のパワーユニットを構成するものである。すなわち、ステータ９０及びロータ９２が収容され、且つ、モータケース９４からモータ軸９６が露出している完成品のモータ２０を、スイングアーム１８内に収容するだけで、スイングアーム１８に対するモータ２０の取付作業が完了するものである。ここで、モータ２０が収容されているスイングアーム１８の構成について、より詳しく説明する。 <2.1 First configuration>
The first configuration is that the motor 20 is configured as an assembly (unit) in which a stator 90 and a rotor 92 as a driving unit of the motor 20 are incorporated in a motor case 94, and the motor 20 is housed in the swing arm 18. , Constituting a swing type power unit. In other words, simply mounting the completed motor 20 in which the stator 90 and the rotor 92 are housed and the motor shaft 96 is exposed from the motor case 94 in the swing arm 18, attaches the motor 20 to the swing arm 18. The work is completed. Here, the configuration of the swing arm 18 that houses the motor 20 will be described in more detail.
　スイングアーム１８は、スイングアーム本体９８を有する。スイングアーム本体９８は、内部が空洞の部材であって、後輪１６の前方におけるピボット軸５４近傍の空間で車幅方向に延びる一端部９８ａと、一端部９８ａの左側から後方に延出する連結部９８ｂと、連結部９８ｂに連設され、後輪１６の左側方に配置されたモータ収容部９８ｃと、モータ収容部９８ｃの後方に設けられた他端部９８ｄとを有する。 The swing arm 18 has a swing arm body 98. The swing arm body 98 is a hollow member, and has one end 98a extending in the vehicle width direction in a space near the pivot shaft 54 in front of the rear wheel 16, and a connection extending rearward from the left side of the one end 98a. A portion 98b, a motor accommodating portion 98c connected to the connecting portion 98b and arranged on the left side of the rear wheel 16, and another end 98d provided behind the motor accommodating portion 98c.
　スイングアーム本体９８の一端部９８ａは、スイングアーム１８の前端部を構成し、ピボット軸５４に軸支されている。前述のように、ピボット軸５４は、連結支持部５０を介して車体フレーム２２に支持されている。連結支持部５０は、図１、図２、図６及び図７に示すように、車幅方向に延びて左右一対の立ち上げ部３４Ｌ、３４Ｒを連結するパイプ５０ｂと、パイプ５０ｂから後方に延びてピボット軸５４を支持する４つのピボットブラケット５０ａとから構成される。スイングアーム本体９８の一端部９８ａの左右両側からピボット軸５４に向かって、２つの突出部９８ｅが前方に延びている。２つの突出部９８ｅは、ピボット軸５４の車幅方向の両端部に設けられた２つの軸受１００を介して、ピボット軸５４に軸支されている。 一端 One end 98a of the swing arm body 98 constitutes the front end of the swing arm 18 and is supported by the pivot shaft 54. As described above, the pivot shaft 54 is supported by the vehicle body frame 22 via the connection support portion 50. As shown in FIGS. 1, 2, 6, and 7, the connection supporting portion 50 extends in the vehicle width direction and connects the pair of left and right rising portions 34L and 34R, and extends rearward from the pipe 50b. And four pivot brackets 50a that support the pivot shaft 54. Two protrusions 98 e extend forward from both left and right sides of one end 98 a of the swing arm body 98 toward the pivot shaft 54. The two protrusions 98e are supported by the pivot shaft 54 via two bearings 100 provided at both ends of the pivot shaft 54 in the vehicle width direction.
　スイングアーム本体９８の連結部９８ｂは、図１、図３及び図４の側面視で、前方から後方に向って徐々に拡開している。スイングアーム本体９８のモータ収容部９８ｃ及び他端部９８ｄは、スイングアーム１８の後端部を構成する。モータ収容部９８ｃは、図１、図３及び図４の側面視で略円形状に形成され、且つ、図５の断面視で車幅方向内側に凹むように形成されている。スイングアーム本体９８の他端部９８ｄには、リヤクッション５６が連結されている。 The connecting portion 98b of the swing arm body 98 gradually expands from the front to the rear as viewed from the side in FIGS. 1, 3, and 4. The motor housing 98 c and the other end 98 d of the swing arm main body 98 constitute a rear end of the swing arm 18. The motor accommodating portion 98c is formed in a substantially circular shape in a side view in FIGS. 1, 3 and 4, and is formed so as to be recessed inward in the vehicle width direction in a sectional view in FIG. The rear cushion 56 is connected to the other end 98d of the swing arm body 98.
　スイングアーム本体９８において、連結部９８ｂの後部及びモータ収容部９８ｃは、左側方に開口している。この開口部分は、モータ２０を受容可能な大きさに開口され、スイングアームカバー１０２で左方から覆われている。スイングアームカバー１０２は、複数のボルト１０４によってスイングアーム本体９８に取り付けられる。なお、図３～図５は、スイングアーム本体９８からスイングアームカバー１０２を取り外した状態を図示している。 に お い て In the swing arm body 98, the rear part of the connecting part 98b and the motor housing part 98c are open to the left. This opening is opened to a size that can receive the motor 20 and is covered with the swing arm cover 102 from the left. The swing arm cover 102 is attached to the swing arm body 98 by a plurality of bolts 104. 3 to 5 show a state in which the swing arm cover 102 is removed from the swing arm body 98.
　モータ収容部９８ｃに収容されるモータ２０は、例えば、三相の交流モータであって、ステータ９０と、ロータ９２と、ステータ９０及びロータ９２を内部に収容するモータケース９４とを有する。モータケース９４は、モータケース９４の外箱であって、車幅方向に延びる筒状のハウジングとしてのステータ支持部９４ａと、ステータ支持部９４ａの車幅方向両端の２つの開口を塞ぐロータカバーとしての左右のロータ支持部９４Ｌ、９４Ｒとを有する。 The motor 20 accommodated in the motor accommodating portion 98c is, for example, a three-phase AC motor, and includes a stator 90, a rotor 92, and a motor case 94 accommodating the stator 90 and the rotor 92 therein. The motor case 94 is an outer box of the motor case 94, and serves as a stator support portion 94a as a cylindrical housing extending in the vehicle width direction and a rotor cover for closing two openings at both ends in the vehicle width direction of the stator support portion 94a. And left and right rotor support portions 94L and 94R.
　ステータ９０は、積層鋼板からなる円筒状のステータコア９０ａを有する。ステータコア９０ａには、モータ２０の周方向に複数のスロット９０ｂが所定角度間隔で形成されている。複数のスロット９０ｂにはコイル９０ｃが巻回されている。ステータ支持部９４ａは、ステータコア９０ａの外周面、すなわち、ステータ９０におけるモータ２０の径方向の外側面を固定状態で支持するステータホルダである。これにより、積層鋼板から構成されるステータコア９０ａの機械的強度が補強される。なお、ステータコア９０ａは、例えば、焼き嵌めによってステータ支持部９４ａに固定される。 The stator 90 has a cylindrical stator core 90a made of a laminated steel plate. A plurality of slots 90b are formed in the stator core 90a at predetermined angular intervals in the circumferential direction of the motor 20. A coil 90c is wound around the plurality of slots 90b. The stator support portion 94a is a stator holder that supports the outer peripheral surface of the stator core 90a, that is, the radial outer surface of the motor 20 in the stator 90 in a fixed state. Thereby, the mechanical strength of the stator core 90a made of the laminated steel sheet is reinforced. The stator core 90a is fixed to the stator support 94a by shrink fitting, for example.
　ステータ９０の径方向内側には、ロータ９２が配置されている。ロータ９２は、積層鋼板からなる円筒状のロータコア９２ａを有する。ロータコア９２ａには、モータ２０の周方向に複数のスロット９２ｂが所定角度間隔で形成されている。複数のスロット９２ｂには磁石９２ｃが配置されている。ロータコア９２ａの中心には、モータ軸９６が車幅方向に貫通している。モータ軸９６は、２つのロータ支持部９４Ｌ、９４Ｒの中心部に形成された開口を貫通して車幅方向に延在している。モータ軸９６は、２つの開口に設けられた軸受１０６Ｌ、１０６Ｒを介して２つのロータ支持部９４Ｌ、９４Ｒに軸支されている。つまり、ロータ９２は、モータ軸９６及び２つの軸受１０６Ｌ、１０６Ｒを介して、回転自在に２つのロータ支持部９４Ｌ、９４Ｒに軸支されている。 ロ ー タ A rotor 92 is disposed radially inward of the stator 90. The rotor 92 has a cylindrical rotor core 92a made of a laminated steel plate. A plurality of slots 92b are formed in the rotor core 92a in the circumferential direction of the motor 20 at predetermined angular intervals. Magnets 92c are arranged in the plurality of slots 92b. A motor shaft 96 extends through the center of the rotor core 92a in the vehicle width direction. The motor shaft 96 extends in the vehicle width direction through an opening formed at the center of the two rotor support portions 94L and 94R. The motor shaft 96 is supported by two rotor supporting portions 94L and 94R via bearings 106L and 106R provided in the two openings. That is, the rotor 92 is rotatably supported by the two rotor supporting portions 94L and 94R via the motor shaft 96 and the two bearings 106L and 106R.
　モータ軸９６の左端部９６Ｌは、左側のロータ支持部９４Ｌから車幅方向外側（左方向）に突出している。左側のロータ支持部９４Ｌにおいて、モータ軸９６の左端部９６Ｌが突出する箇所は、車幅方向内側に凹む凹部１０８として形成されている。凹部１０８は、カバー部材１１０によって左方から覆われている。従って、スイングアーム本体９８からスイングアームカバー１０２を取り外しても、モータ軸９６の左端部９６Ｌが露出することはない（図３及び図５参照）。 左 The left end portion 96L of the motor shaft 96 projects outward (leftward) in the vehicle width direction from the left rotor support portion 94L. In the left rotor support portion 94L, a portion where the left end portion 96L of the motor shaft 96 projects is formed as a concave portion 108 that is recessed inward in the vehicle width direction. The recess 108 is covered by a cover member 110 from the left. Therefore, even if the swing arm cover 102 is removed from the swing arm body 98, the left end portion 96L of the motor shaft 96 is not exposed (see FIGS. 3 and 5).
　凹部１０８とカバー部材１１０とで形成される内部空間には、ロータ９２及びモータ軸９６の回転角度を検出する回転角度検出部１１２が配設されている。回転角度検出部１１２は、レゾルバであって、モータ軸９６の左端部９６Ｌに取り付けられたレゾルバロータ１１２ａと、レゾルバロータ１１２ａに対向するように左側のロータ支持部９４Ｌに固定されたレゾルバステータ１１２ｂとを有する。なお、レゾルバは周知であるため、その詳細な説明は省略する。 (4) A rotation angle detection unit 112 for detecting the rotation angles of the rotor 92 and the motor shaft 96 is provided in an internal space formed by the recess 108 and the cover member 110. The rotation angle detector 112 is a resolver, which is a resolver rotor 112a attached to the left end 96L of the motor shaft 96, and a resolver stator 112b fixed to the left rotor support 94L so as to face the resolver rotor 112a. Having. Since the resolver is well known, a detailed description thereof will be omitted.
　一方、モータ軸９６の右端部（先端部）９６Ｒは、スイングアーム本体９８のモータ収容部９８ｃに指向するように、右側のロータ支持部９４Ｒから車幅方向内側（右方向）に突出している。従って、右側のロータ支持部９４Ｒとステータ支持部９４ａの右側部分とが、モータ収容部９８ｃとの対向部分となる。スイングアーム本体９８のモータ収容部９８ｃの右側には、後述する減速機１１４を収容する減速機収容部１１６が設けられている。 On the other hand, the right end (tip) 96R of the motor shaft 96 protrudes inward (rightward) in the vehicle width direction from the right rotor support 94R so as to be directed to the motor housing 98c of the swing arm body 98. Therefore, the right rotor support 94R and the right portion of the stator support 94a are opposed to the motor housing 98c. On the right side of the motor housing 98c of the swing arm body 98, a speed reducer housing 116 for housing a speed reducer 114 described later is provided.
　モータ軸９６の右端部９６Ｒは、減速機収容部１１６に挿入され、該減速機収容部１１６に設けられた軸受１１８によって軸支されている。また、モータ軸９６の右端部９６Ｒ側には、スプライン加工が施されている。スプライン加工が施された部分には、後輪１６の車軸（出力軸）１６ａを回転させるためのモータ側ギヤ１２０（歯車）が挿入されている。さらに、モータ側ギヤ１２０と軸受１１８との間には、モータ側ギヤ１２０の抜け止めを防止するためのワッシャ１２２が介挿されている。なお、モータ収容部９８ｃに対してモータ２０を交換可能とするため、ワッシャ１２２は、モータ軸９６に対して低圧入のワッシャであることが望ましい。低圧入のワッシャ１２２であるため、組み付けが容易である。 The right end 96R of the motor shaft 96 is inserted into the reduction gear housing 116 and is supported by a bearing 118 provided in the reduction gear housing 116. The right end portion 96R of the motor shaft 96 is splined. A motor-side gear 120 (gear) for rotating an axle (output shaft) 16a of the rear wheel 16 is inserted into the splined portion. Further, a washer 122 is interposed between the motor-side gear 120 and the bearing 118 to prevent the motor-side gear 120 from coming off. The washer 122 is desirably a low-pressure press-fitted washer with respect to the motor shaft 96 so that the motor 20 can be exchanged into the motor accommodating portion 98c. Since the washer 122 has a low press fit, the assembling is easy.
　２つのロータ支持部９４Ｌ、９４Ｒ及びステータ支持部９４ａには、車幅方向に延びる複数のネジ孔（第１貫通孔、第２貫通孔）１２４が、モータ２０の周方向に所定角度間隔で形成されている。これらのネジ孔１２４には、複数のボルト１２６、１２８が螺合する。図３～図５に示すように、本実施形態では、ネジ孔１２４が９箇所形成されている。 A plurality of screw holes (first through hole, second through hole) 124 extending in the vehicle width direction are formed at predetermined angular intervals in the circumferential direction of the motor 20 in the two rotor support portions 94L, 94R and the stator support portion 94a. Have been. A plurality of bolts 126 and 128 are screwed into these screw holes 124. As shown in FIGS. 3 to 5, in this embodiment, nine screw holes 124 are formed.
　このうち、３箇所のネジ孔１２４には、長さの短いボルト１２６が螺合している。短いボルト１２６は、ロータ支持部９４Ｌ、９４Ｒとステータ支持部９４ａとの固定に用いられる。図５に示すように、短いボルト１２６は、ネジ孔１２４に対して左方から挿入されることで、ロータ支持部９４Ｌ及びステータ支持部９４ａをロータ支持部９４Ｒに締付固定する。 ボ ル ト A bolt 126 having a short length is screwed into the three screw holes 124. The short bolt 126 is used for fixing the rotor supports 94L and 94R to the stator support 94a. As shown in FIG. 5, the short bolt 126 is inserted into the screw hole 124 from the left side, thereby fastening and fixing the rotor support 94L and the stator support 94a to the rotor support 94R.
　一方、他の６箇所のネジ孔１２４には、長いボルト（固定手段）１２８が螺合している。長いボルト１２８は、２つのロータ支持部９４Ｌ、９４Ｒ及びステータ支持部９４ａを含むモータケース９４のモータ収容部９８ｃへの固定に用いられる。すなわち、長いボルト１２８は、ネジ孔１２４に対して左方から挿入され、モータ収容部９８ｃに設けられたボルト穴１３０に螺合することで、ロータ支持部９４Ｌ、ステータ支持部９４ａ及びロータ支持部９４Ｒをモータ収容部９８ｃに締付固定する。 On the other hand, long bolts (fixing means) 128 are screwed into the other six screw holes 124. The long bolt 128 is used for fixing the motor case 94 including the two rotor supports 94L and 94R and the stator support 94a to the motor housing 98c. That is, the long bolt 128 is inserted into the screw hole 124 from the left side, and screwed into the bolt hole 130 provided in the motor housing 98c, so that the rotor support 94L, the stator support 94a, and the rotor support The 94R is fastened and fixed to the motor housing 98c.
　なお、ネジ孔１２４の個数及び形成位置や、各ネジ孔１２４に螺合するボルト１２６、１２８の種類及び個数は任意であり、スイングアーム１８及びモータ２０の仕様等に応じて設計変更してもよいことは勿論である。 The number and position of the screw holes 124 and the types and numbers of the bolts 126 and 128 to be screwed into the respective screw holes 124 are arbitrary, and the design may be changed according to the specifications of the swing arm 18 and the motor 20 and the like. Of course it is good.
　そして、第１の構成では、電動車両１０を製造する際、スイングアーム本体９８のモータ収容部９８ｃにモータ２０を取り付ける。モータ２０は、ステータ９０及びロータ９２をモータケース９４に収容し、モータ軸９６の右端部９６Ｒを右側のロータ支持部９４Ｒから突出させた組立体（ユニット）の状態で、電動車両１０の製造工程に供される。その際、長さの短いボルト１２６は、本留めの状態でロータ支持部９４Ｌ、９４Ｒとステータ支持部９４ａとを固定し、一方で、長いボルト１２８は、仮留めの状態にしておけばよい。 In the first configuration, when the electric vehicle 10 is manufactured, the motor 20 is attached to the motor housing 98c of the swing arm body 98. The motor 20 includes a motor case 94 in which the stator 90 and the rotor 92 are housed in a motor case 94, and a right end portion 96R of the motor shaft 96 protrudes from the right rotor support portion 94R. To be served. At this time, the bolt 126 having a short length fixes the rotor support portions 94L and 94R and the stator support portion 94a in a state of permanent fastening, while the long bolt 128 may be temporarily fastened.
　この場合、先ず、モータ軸９６の右端部９６Ｒを減速機収容部１１６に挿入し、軸受１１８に軸支させる。その際、モータ軸９６の右端部９６Ｒ側のスプライン加工された部分にモータ側ギヤ１２０とワッシャ１２２とを嵌め込んだ状態で、モータ２０の右端部９６Ｒを軸受１１８に軸支させればよい。次に、長いボルト１２８が仮留めされている６箇所のネジ孔１２４とモータ収容部９８ｃ側の６箇所のボルト穴１３０とを位置決めした後に、長いボルト１２８をネジ孔１２４及びボルト穴１３０に螺合させることで、モータケース９４をモータ収容部９８ｃに固定する。これにより、モータ収容部９８ｃにモータ２０が収容され、スイングアーム１８に対するモータ２０の取付作業が完了する。 In this case, first, the right end portion 96R of the motor shaft 96 is inserted into the reduction gear accommodating portion 116 and is supported by the bearing 118. At this time, the right end portion 96R of the motor 20 may be supported by the bearing 118 in a state where the motor side gear 120 and the washer 122 are fitted into the splined portion on the right end portion 96R side of the motor shaft 96. Next, after positioning the six screw holes 124 where the long bolts 128 are temporarily fastened and the six bolt holes 130 on the motor housing 98c side, the long bolts 128 are screwed into the screw holes 124 and the bolt holes 130. By doing so, the motor case 94 is fixed to the motor housing 98c. As a result, the motor 20 is housed in the motor housing 98c, and the work of attaching the motor 20 to the swing arm 18 is completed.
＜２．２　第２の構成＞
　第２の構成は、モータ収容部９８ｃに収容されたモータ２０の一部を外部に露出させることで、モータ２０を効率的に冷却させるための構成である。 <2.2 Second Configuration>
The second configuration is a configuration for efficiently cooling the motor 20 by exposing a part of the motor 20 housed in the motor housing portion 98c to the outside.
　図１及び図２に示すように、スイングアームカバー１０２には、モータケース９４の一部を外部に露出させる開口部分としての露出部１３２が形成されている。具体的に、露出部１３２は、図１の側面視で、モータケース９４の後部を外部に露出させるように、スイングアームカバー１０２のモータ収容部９８ｃに対応する箇所で、前方から後方に向って円弧状に形成された開口部である。また、露出部１３２は、図２に示すように、車幅方向に一定の幅を有するように開口し、モータケース９４を車幅方向に外部に露出させている。しかも、円弧状の露出部１３２は、前方から後方に向かう程、上下方向に幅広になり、露出面積が徐々に大きくなっている。 As shown in FIGS. 1 and 2, the swing arm cover 102 has an exposed portion 132 as an opening for exposing a part of the motor case 94 to the outside. Specifically, in the side view of FIG. 1, the exposed portion 132 is directed from the front to the rear at a position corresponding to the motor housing portion 98c of the swing arm cover 102 so as to expose the rear portion of the motor case 94 to the outside. An opening formed in an arc shape. Further, as shown in FIG. 2, the exposed portion 132 is opened so as to have a constant width in the vehicle width direction, and exposes the motor case 94 to the outside in the vehicle width direction. Moreover, the arc-shaped exposed portion 132 becomes wider in the vertical direction as going from the front to the rear, and the exposed area gradually increases.
　従って、スイングアームカバー１０２は、図１の側面視で、モータケース９４の中心部分、すなわち、モータ軸９６及び回転角度検出部１１２（図５参照）を左方から覆う円形部１０２ａを有する。図１及び図２に示すように、円形部１０２ａとスイングアームカバー１０２の後端部１０２ｂとは、前後方向に延びる連結部１０２ｃで連結されている。また、露出部１３２は、図４に示すように、コイル９０ｃが巻回されるスロット９０ｂに対応するように設けられている。さらに、露出部１３２は、図１、図２及び図４に示すように、複数のボルト１２６、１２８がスイングアームカバー１０２で覆われるように、モータケース９４の一部を外部に露出させている。 Therefore, the swing arm cover 102 has a circular portion 102a that covers the central portion of the motor case 94, that is, the motor shaft 96 and the rotation angle detector 112 (see FIG. 5) from the left side when viewed from the side in FIG. As shown in FIGS. 1 and 2, the circular portion 102a and the rear end portion 102b of the swing arm cover 102 are connected by a connecting portion 102c extending in the front-rear direction. Further, as shown in FIG. 4, the exposed portion 132 is provided so as to correspond to the slot 90b around which the coil 90c is wound. Further, as shown in FIGS. 1, 2 and 4, the exposed portion 132 exposes a part of the motor case 94 to the outside so that the plurality of bolts 126 and 128 are covered by the swing arm cover 102. .
　前述のように、モータ２０は、三相の交流モータである。後述するように、モータ２０は、ＰＣＵ６６から三相線としての給電線１３４を介してコイル９０ｃに交流電力を供給することで回転駆動する。この場合、給電線１３４は、モータ２０から前方に引き出されている。そのため、スイングアームカバー１０２及びスイングアーム本体９８は、給電線１３４を前方及び側方から覆っている。 、 As described above, the motor 20 is a three-phase AC motor. As described later, the motor 20 is driven to rotate by supplying AC power to the coil 90c from the PCU 66 via the power supply line 134 as a three-phase line. In this case, the power supply line 134 is drawn forward from the motor 20. Therefore, the swing arm cover 102 and the swing arm body 98 cover the power supply line 134 from the front and side.
＜２．３　第３の構成＞
　第３の構成は、モータ２０からの給電線１３４の引き回し、及び、回転角度検出部１１２からの通信線１３６の引き回しに関する構成である。 <2.3 Third Configuration>
The third configuration relates to the routing of the power supply line 134 from the motor 20 and the routing of the communication line 136 from the rotation angle detection unit 112.
　図６及び図７に示すように、スイングアーム本体９８の一端部９８ａにおいて、後輪１６の前方の箇所には、前方に開口する貫通孔１３８が形成されている。この貫通孔１３８は、スイングアーム本体９８の一端部９８ａにおいて、ピボット軸５４の上方、且つ、２つの軸受１００の間の箇所に形成されている。 As shown in FIGS. 6 and 7, a through hole 138 that opens forward is formed at one end 98 a of the swing arm main body 98 at a location in front of the rear wheel 16. The through hole 138 is formed at one end 98 a of the swing arm body 98 above the pivot shaft 54 and at a location between the two bearings 100.
　給電線１３４は、図３、図４、図６及び図７に示すように、剛性の高い三相線のハーネスであって、スイングアーム１８の内部形状に沿って、スイングアーム１８内を引き回されている。すなわち、給電線１３４は、スイングアーム１８の内部でモータ２０から前方に延び、スイングアーム本体９８の一端部９８ａで車幅方向の内側に曲がり、貫通孔１３８からスイングアーム１８の前方に延出している。この場合、給電線１３４は、ピボット軸５４の上方で２つの軸受１００の間から貫通孔１３８を介してスイングアーム１８の前方に延出している。そして、貫通孔１３８から引き出された給電線１３４は、ピボット軸５４の上方に引き回され、バッテリ６２の後ろ斜め下方に配置されたＰＣＵ６６に接続されている。従って、ＰＣＵ６６とモータ２０とは、給電線１３４を介して交流電力の授受を行う。 The power supply line 134 is a rigid three-phase wire harness as shown in FIGS. 3, 4, 6, and 7, and is routed inside the swing arm 18 along the internal shape of the swing arm 18. Have been. That is, the power supply line 134 extends forward from the motor 20 inside the swing arm 18, bends inward in the vehicle width direction at one end 98 a of the swing arm body 98, and extends forward from the through hole 138 to the front of the swing arm 18. I have. In this case, the power supply line 134 extends forward of the swing arm 18 through the through hole 138 between the two bearings 100 above the pivot shaft 54. The power supply line 134 drawn out from the through hole 138 is routed above the pivot shaft 54 and connected to the PCU 66 disposed diagonally below and behind the battery 62. Therefore, the PCU 66 and the motor 20 exchange AC power via the power supply line 134.
　一方、回転角度検出部１１２からは通信線１３６が引き出されている。通信線１３６は、給電線１３４よりも剛性の低いハーネスである。そのため、通信線１３６は、給電線１３４と比較して引き回しが容易であり、給電線１３４に這わせるように、スイングアーム１８内で回転角度検出部１１２から前方に延び、スイングアーム本体９８の一端部９８ａで車幅方向の内側に曲がり、貫通孔１３８からスイングアーム１８の前方に延出している。そのため、通信線１３６もピボット軸５４の上方で２つの軸受１００の間から貫通孔１３８を介してスイングアーム１８の前方に延出する。そして、貫通孔１３８から引き出された通信線１３６は、ピボット軸５４の上方に引き回され、ＰＣＵ６６に接続される。従って、ＰＣＵ６６と回転角度検出部１１２とは、通信線１３６を介して、ロータ９２及びモータ軸９６の回転角度の検出結果の送受信が可能である。 On the other hand, a communication line 136 is drawn from the rotation angle detection unit 112. The communication line 136 is a harness having lower rigidity than the power supply line 134. Therefore, the communication line 136 is easier to route than the power supply line 134, and extends forward from the rotation angle detection unit 112 in the swing arm 18 so as to crawl along the power supply line 134. It is bent inward in the vehicle width direction at the portion 98a, and extends forward of the swing arm 18 from the through hole 138. Therefore, the communication line 136 also extends forward of the swing arm 18 through the through hole 138 between the two bearings 100 above the pivot shaft 54. Then, the communication line 136 drawn from the through hole 138 is routed above the pivot shaft 54 and connected to the PCU 66. Therefore, the PCU 66 and the rotation angle detection unit 112 can transmit and receive the detection results of the rotation angles of the rotor 92 and the motor shaft 96 via the communication line 136.
　また、スイングアーム１８の内部、具体的には、スイングアーム本体９８の連結部９８ｂにおいて、給電線１３４と通信線１３６とは、グロメット等の結束部材１４０で結束され、ステー１４２によって連結部９８ｂ内に固定されている（図６及び図７参照）。 Further, inside the swing arm 18, specifically, at the connecting portion 98 b of the swing arm main body 98, the power supply line 134 and the communication line 136 are bound by a binding member 140 such as a grommet, and the stay 142 connects the inside of the connecting portion 98 b. (See FIGS. 6 and 7).
　また、貫通孔１３８が前方に開口するように形成されているため、電動車両１０の走行時には、前方から貫通孔１３８を介して水等の液体がスイングアーム１８内に浸入する可能性がある。そこで、スイングアーム本体９８の底部には、水抜き用の孔１４４が形成されている。図６及び図７では、一例として、スイングアーム本体９８の底部における貫通孔１３８近傍の箇所に孔１４４を形成した場合を図示している。 In addition, since the through hole 138 is formed so as to open forward, there is a possibility that liquid such as water may enter the swing arm 18 from the front through the through hole 138 when the electric vehicle 10 travels. Therefore, a hole 144 for draining water is formed at the bottom of the swing arm body 98. FIGS. 6 and 7 show, as an example, a case where the hole 144 is formed at a position near the through hole 138 on the bottom of the swing arm body 98.
　さらに、スイングアーム本体９８の内部において、貫通孔１３８とモータ収容部９８ｃとの間、具体的には、連結部９８ｂの後部からモータ収容部９８ｃまでの箇所には、スイングアーム本体９８の強度を補強するための複数のリブ１４６が設けられている。 Further, inside the swing arm body 98, the strength of the swing arm body 98 is provided between the through hole 138 and the motor accommodating portion 98c, specifically, at a position from the rear portion of the connecting portion 98b to the motor accommodating portion 98c. A plurality of ribs 146 for reinforcement are provided.
＜２．４　第４の構成＞
　第４の構成は、減速機収容部１１６内の温度上昇に起因して、減速機収容部１１６内の圧力（内圧）が上昇することにより、減速機１１４に用いられる潤滑油が揮発した際に、霧状の潤滑油を含む気体を外部に排出して内圧を低下させるためのブリーザチューブ１４８に関する構成である。ここで、減速機収容部１１６周りの構成について説明する。 <2.4 Fourth configuration>
In the fourth configuration, when the lubricating oil used for the speed reducer 114 evaporates due to an increase in the pressure (internal pressure) in the speed reducer housing 116 due to a rise in the temperature inside the speed reducer housing 116. And a breather tube 148 for discharging gas containing mist-like lubricating oil to the outside to reduce the internal pressure. Here, the configuration around the reduction gear housing 116 will be described.
　図５、図８及び図９に示すように、スイングアーム１８には、スイングアーム本体９８の車幅方向内側に取り付けられ、減速機１１４を収容する減速機収容部１１６がさらに設けられている。減速機収容部１１６よりも車幅方向内側であって、後輪１６のホイール１６ｂの内側には、ブレーキ機構１５０が設けられている。従って、後輪１６の周辺では、車幅方向の左側から右側に向かって、モータ２０、減速機１１４及びブレーキ機構１５０が順に配置されている。 As shown in FIGS. 5, 8 and 9, the swing arm 18 is further provided with a speed reducer accommodating portion 116 that is attached to the inside of the swing arm body 98 in the vehicle width direction and houses the speed reducer 114. A brake mechanism 150 is provided inside the reduction gear housing 116 in the vehicle width direction and inside the wheel 16 b of the rear wheel 16. Therefore, around the rear wheel 16, the motor 20, the speed reducer 114, and the brake mechanism 150 are sequentially arranged from the left side to the right side in the vehicle width direction.
　また、スイングアーム本体９８のモータ収容部９８ｃの右側には、ボルト１５２によってギヤケースカバー１５４が固定されている。モータ収容部９８ｃとギヤケースカバー１５４とによって形成される内部空間が減速機収容部１１６として構成される。 ギ ヤ A gear case cover 154 is fixed to the right side of the motor housing portion 98c of the swing arm body 98 by bolts 152. The internal space formed by the motor housing 98c and the gear case cover 154 is configured as the reduction gear housing 116.
　減速機１１４は、モータ軸９６に装着されたモータ側ギヤ１２０と、モータ軸９６の後方に配置され、車幅方向に延びる中間軸１５６と、中間軸１５６に装着され、モータ側ギヤ１２０に噛合するリダクションギヤとしての中間ギヤ１５８と、中間軸１５６の後方に配置された後輪１６の車軸１６ａに装着され、中間軸１５６の車幅方向左側に形成されたギヤ部１６０に噛合する出力ギヤ１６２とを有する。 The speed reducer 114 is mounted on the motor shaft 96, an intermediate shaft 156 disposed behind the motor shaft 96 and extending in the vehicle width direction, mounted on the intermediate shaft 156, and meshed with the motor gear 120. And an output gear 162 mounted on the axle 16a of the rear wheel 16 disposed behind the intermediate shaft 156 and meshing with a gear 160 formed on the left side of the intermediate shaft 156 in the vehicle width direction. And
　中間軸１５６の右端部は、ギヤケースカバー１５４に配置された軸受１６４Ｒに軸支されている。中間軸１５６の左端部は、モータ収容部９８ｃの右側に配置された軸受１６４Ｌに軸支されている。車軸１６ａの左端部は、モータ収容部９８ｃの右側に配置された軸受１６６Ｌに軸支されている。車軸１６ａの右端部は、ギヤケースカバー１５４を貫通して外部に露出し、後輪１６のホイール１６ｂに連結されている。車軸１６ａの右端部側は、ギヤケースカバー１５４に配置された軸受１６６Ｒに軸支されている。 右 The right end of the intermediate shaft 156 is supported by a bearing 164R disposed on the gear case cover 154. The left end of the intermediate shaft 156 is supported by a bearing 164L disposed on the right side of the motor housing 98c. The left end of the axle 16a is supported by a bearing 166L disposed on the right side of the motor housing 98c. The right end of the axle 16a is exposed to the outside through the gear case cover 154 and is connected to the wheel 16b of the rear wheel 16. The right end side of the axle 16a is supported by a bearing 166R arranged on the gear case cover 154.
　従って、モータ２０が駆動してモータ軸９６が回転した際、モータ２０の駆動力がモータ側ギヤ１２０、中間ギヤ１５８、中間軸１５６、ギヤ部１６０及び出力ギヤ１６２を介して車軸１６ａに伝達され、車軸１６ａに連結された後輪１６を回転させることができる。この場合、減速機１１４は、モータ軸９６の回転速度を中間ギヤ１５８によって減速させ、車軸１６ａ及び後輪１６を回転駆動させる。 Therefore, when the motor 20 is driven to rotate the motor shaft 96, the driving force of the motor 20 is transmitted to the axle 16 a via the motor-side gear 120, the intermediate gear 158, the intermediate shaft 156, the gear 160 and the output gear 162. The rear wheel 16 connected to the axle 16a can be rotated. In this case, the speed reducer 114 reduces the rotation speed of the motor shaft 96 by the intermediate gear 158, and drives the axle 16a and the rear wheel 16 to rotate.
　ブレーキ機構１５０は、ドラムブレーキであって、ホイール１６ｂの内側に設けられたドラム１５０ａと、車軸１６ａを挟んで両側に配置された２つのシュー１５０ｂと、シュー１５０ｂのドラム１５０ａ側に配置されたライニング１５０ｃとを有する。この場合、２つのシュー１５０ｂの間に介挿されたバネ部材１５０ｄの引張力に抗して、２つのシュー１５０ｂを互いに離間させると、２つのシュー１５０ｂのライニング１５０ｃがドラム１５０ａをそれぞれ押圧するので、ドラム１５０ａが装着されたホイール１６ｂ（後輪１６）の回転を制動させることができる。なお、ドラムブレーキは周知であるため、その詳細な説明は省略する。 The brake mechanism 150 is a drum brake, and includes a drum 150a provided inside the wheel 16b, two shoes 150b arranged on both sides of the axle 16a, and a lining arranged on the drum 150a side of the shoe 150b. 150c. In this case, when the two shoes 150b are separated from each other against the tensile force of the spring member 150d inserted between the two shoes 150b, the lining 150c of the two shoes 150b presses the drum 150a, respectively. The rotation of the wheel 16b (rear wheel 16) on which the drum 150a is mounted can be braked. Since the drum brake is well known, a detailed description thereof will be omitted.
　そして、第４の構成において、スイングアーム１８には、減速機収容部１１６から延出するブリーザチューブ１４８が設けられている（図２～図４、図８及び図９参照）。ブリーザチューブ１４８は、減速機収容部１１６の上方に配設されている。従って、ブリーザチューブ１４８は、減速機収容部１１６と同様に、モータ２０と後輪１６との間に配置されている。 In the fourth configuration, the swing arm 18 is provided with a breather tube 148 extending from the reduction gear housing 116 (see FIGS. 2 to 4, 8, and 9). The breather tube 148 is provided above the reduction gear housing 116. Therefore, the breather tube 148 is disposed between the motor 20 and the rear wheel 16 as in the case of the reduction gear housing 116.
　ブリーザチューブ１４８の入口である一端部１４８ａは、ギヤケースカバー１５４に固定された状態で、減速機収容部１１６に連通している。また、ブリーザチューブ１４８の出口である他端部１４８ｂは、スイングアーム１８の上方で、スイングアーム１８と共に揺動可能なフェンダ６０に配置されている。この場合、フェンダ６０の左側面に設けられた筒状の固定部１６８にブリーザチューブ１４８の他端部１４８ｂを挿し込むことで、該他端部１４８ｂがフェンダ６０に固定される。従って、ブリーザチューブ１４８は、一端部１４８ａ（入口）が下向きに指向し、他端部１４８ｂ（出口）が上向きに指向した状態で、配置されている。 One end 148a, which is the inlet of the breather tube 148, is fixed to the gear case cover 154 and communicates with the reduction gear housing 116. The other end 148b, which is the outlet of the breather tube 148, is disposed above the swing arm 18 on a fender 60 that can swing together with the swing arm 18. In this case, the other end 148b of the breather tube 148 is fixed to the fender 60 by inserting the other end 148b of the breather tube 148 into a cylindrical fixing portion 168 provided on the left side surface of the fender 60. Therefore, the breather tube 148 is arranged with one end 148a (entrance) directed downward and the other end 148b (exit) directed upward.
　図８及び図９に示すように、モータ収容部９８ｃの右側において、減速機収容部１１６の上方には、前後方向に延びる上壁部１７０が形成されている。ブリーザチューブ１４８は、減速機収容部１１６から上方に延び、上壁部１７０に沿って前方に屈曲し、上壁部１７０の前端部で上方に屈曲してフェンダ６０の固定部１６８に延びている。この場合、上壁部１７０は、ブリーザチューブ１４８の他端部１４８ｂが一端部１４８ａよりも高くなるように傾斜している。そのため、ブリーザチューブ１４８において、上壁部１７０に配置される中間部分１４８ｃは、前方に向かって徐々に高くなるように傾斜して上壁部１７０に配置されている。上壁部１７０には、上方に突出することで、ブリーザチューブ１４８を上壁部１７０とモータ収容部９８ｃの右側部分とに固定するための突起等の固定部１７２が設けられている。 As shown in FIGS. 8 and 9, an upper wall 170 extending in the front-rear direction is formed above the reduction gear housing 116 on the right side of the motor housing 98 c. The breather tube 148 extends upward from the reduction gear housing 116, bends forward along the upper wall 170, bends upward at the front end of the upper wall 170, and extends to the fixing portion 168 of the fender 60. . In this case, the upper wall 170 is inclined such that the other end 148b of the breather tube 148 is higher than the one end 148a. Therefore, in the breather tube 148, the intermediate portion 148c disposed on the upper wall 170 is inclined and disposed on the upper wall 170 so as to gradually increase toward the front. The upper wall 170 is provided with a fixing portion 172 such as a projection for projecting upward to fix the breather tube 148 to the upper wall 170 and the right side of the motor accommodating portion 98c.
　フェンダ６０の前方の側面には、上下方向及び前後方向に延びる板部材１７４が一体に成形されている。ブリーザチューブ１４８の他端部１４８ｂ（出口）は、板部材１７４の左側に配置される。従って、板部材１７４は、ブリーザチューブ１４８と後輪１６の間に配置されている。 A plate member 174 extending vertically and in the front-rear direction is integrally formed on the front side surface of the fender 60. The other end 148b (outlet) of the breather tube 148 is disposed on the left side of the plate member 174. Therefore, the plate member 174 is disposed between the breather tube 148 and the rear wheel 16.
　一方、ブリーザチューブ１４８の一端部１４８ａ（入口）は、図８に示すように、モータ軸９６と車軸１６ａとの間、より詳しくは、中間軸１５６と車軸１６ａとの間に配置されている。 On the other hand, as shown in FIG. 8, one end 148a (entrance) of the breather tube 148 is disposed between the motor shaft 96 and the axle 16a, more specifically, between the intermediate shaft 156 and the axle 16a.
［３．本実施形態の効果］
　以上説明した本実施形態に係る電動車両１０の効果について、第１～第４の構成の順に説明する。 [3. Effects of the present embodiment]
The effects of the electric vehicle 10 according to the present embodiment described above will be described in the order of the first to fourth configurations.
　本実施形態に係る電動車両１０は、車体フレーム２２と、車体フレーム２２に設けられたピボット軸５４と、前端部（一端部）がピボット軸５４に軸支され、後端部（他端部）が後輪１６を支持するスイングアーム１８と、スイングアーム１８に配置され、後輪１６を駆動するモータ２０とを備える。 In the electric vehicle 10 according to the present embodiment, the vehicle body frame 22, a pivot shaft 54 provided on the vehicle body frame 22, a front end (one end) is pivotally supported by the pivot shaft 54, and a rear end (the other end). Are provided with a swing arm 18 that supports the rear wheel 16 and a motor 20 that is disposed on the swing arm 18 and drives the rear wheel 16.
＜３．１　第１の構成の効果＞
　そして、第１の構成として、電動車両１０は、スイングアーム１８に設けられ、モータ２０を収容するモータ収容部９８ｃをさらに備える。モータ２０は、ステータ９０と、ロータ９２と、ステータ９０を固定状態で内部に収容し、一方で、ロータ９２を回転自在に内部に収容するモータケース９４とを有し、モータケース９４のモータ収容部９８ｃとの対向部分をモータ収容部９８ｃに固定する。 <3.1 Effect of First Configuration>
As a first configuration, the electric vehicle 10 further includes a motor housing 98 c provided on the swing arm 18 and housing the motor 20. The motor 20 includes a stator 90, a rotor 92, and a motor case 94 that houses the stator 90 in a fixed state therein, while rotatably houses the rotor 92 therein. The portion facing the portion 98c is fixed to the motor housing 98c.
　これにより、第１の構成では、ステータ９０及びロータ９２が収容されたモータケース９４をモータ収容部９８ｃに固定するだけで、モータ２０がスイングアーム１８に配置されるので、電動車両１０の生産効率を向上させることができる。 Thus, in the first configuration, the motor 20 is arranged on the swing arm 18 only by fixing the motor case 94 in which the stator 90 and the rotor 92 are accommodated to the motor accommodating portion 98c. Can be improved.
　また、モータケース９４には、モータ収容部９８ｃに指向するネジ孔（第１貫通孔）１２４が形成され、ネジ孔１２４にボルト１２８を挿通させることで、モータケース９４におけるモータ収容部９８ｃとの対向部分を該モータ収容部９８ｃに固定する。これにより、モータケース９４をモータ収容部９８ｃに容易に固定することができる。 Further, a screw hole (first through hole) 124 is formed in the motor case 94 so as to face the motor housing portion 98c. By inserting a bolt 128 into the screw hole 124, the motor case 94 and the motor housing portion 98c in the motor case 94 can be connected. The facing portion is fixed to the motor housing 98c. Thus, the motor case 94 can be easily fixed to the motor housing 98c.
　さらに、モータケース９４は、ロータ９２を回転自在に支持するロータ支持部９４Ｌ、９４Ｒと、ステータ９０におけるモータ２０の径方向の外側面を支持するステータ支持部９４ａとを有する。ステータ支持部９４ａ及びロータ支持部９４Ｌ、９４Ｒをモータケース９４の一部として機能させることで、モータ２０の部品点数を削減することができる。 Furthermore, the motor case 94 has rotor support portions 94L and 94R that rotatably support the rotor 92 and a stator support portion 94a that supports the radial outer surface of the motor 20 in the stator 90. By making the stator support portion 94a and the rotor support portions 94L and 94R function as a part of the motor case 94, the number of parts of the motor 20 can be reduced.
　さらにまた、ロータ支持部９４Ｌ、９４Ｒ及びステータ支持部９４ａには、モータ収容部９８ｃに指向するネジ孔（第２貫通孔）１２４が形成され、ロータ支持部９４Ｒ及びステータ支持部９４ａの一部が対向部分として構成されている。この場合、ネジ孔１２４にボルト１２８を挿通させることで、対向部分がモータ収容部９８ｃに固定される。これにより、モータ２０の部品点数を削減しつつ、モータケース９４をモータ収容部９８ｃに容易に固定することができる。 Further, screw holes (second through holes) 124 are formed in the rotor support portions 94L and 94R and the stator support portion 94a so as to be directed to the motor accommodating portion 98c, and a part of the rotor support portion 94R and a part of the stator support portion 94a are formed. It is configured as an opposing portion. In this case, by inserting the bolt 128 into the screw hole 124, the facing portion is fixed to the motor housing 98c. Thus, the motor case 94 can be easily fixed to the motor housing 98c while reducing the number of parts of the motor 20.
　また、ロータ９２には、右端部（先端部）９６Ｒがモータ収容部９８ｃに指向するようにモータケース９４から突出するモータ軸９６が軸支されている。モータ軸９６の右端部９６Ｒは、モータ収容部９８ｃ側に設けられた軸受１１８によって、回転自在に支持される。これにより、モータ軸９６をモータ収容部９８ｃに好適に支持することができる。 モ ー タ Further, a motor shaft 96 projecting from the motor case 94 is supported by the rotor 92 such that a right end (tip) 96R is directed to the motor accommodating portion 98c. The right end 96R of the motor shaft 96 is rotatably supported by a bearing 118 provided on the side of the motor housing 98c. As a result, the motor shaft 96 can be favorably supported by the motor housing 98c.
　この場合、モータ軸９６の右端部９６Ｒ側にはスプライン加工が施され、スプライン加工が施された部分には、後輪１６の車軸１６ａを駆動させるためのモータ側ギヤ（歯車）１２０が挿入されている。また、モータ側ギヤ１２０と軸受１１８との間には、抜け止め用のワッシャ１２２が設けられている。これにより、モータ側ギヤ１２０がモータ軸９６から抜けることを回避することができる。 In this case, a spline process is performed on the right end portion 96R side of the motor shaft 96, and a motor-side gear (gear) 120 for driving the axle 16a of the rear wheel 16 is inserted into the spline processed portion. ing. Further, a washer 122 is provided between the motor-side gear 120 and the bearing 118 to prevent the motor from being disengaged. Thus, the motor-side gear 120 can be prevented from coming off the motor shaft 96.
＜３．２　第２の構成の効果＞
　第２の構成において、電動車両１０は、スイングアーム１８に設けられ、モータ２０を収容するモータ収容部９８ｃをさらに備える。モータ２０は、該モータ２０の駆動部であるステータ９０及びロータ９２を収容するモータケース９４を有する。スイングアーム１８は、モータケース９４の一部を外部に露出させる露出部１３２を設けたスイングアームカバー１０２を有する。 <3.2 Effect of Second Configuration>
In the second configuration, the electric vehicle 10 further includes a motor accommodating portion 98c provided on the swing arm 18 and accommodating the motor 20. The motor 20 has a motor case 94 that houses a stator 90 and a rotor 92 that are driving units of the motor 20. The swing arm 18 has a swing arm cover 102 provided with an exposed part 132 for exposing a part of the motor case 94 to the outside.
　これにより、第２の構成では、スイングアームカバー１０２に設けられた露出部１３２を介してモータ２０の熱を外部に放熱する。この結果、スイングアーム１８のモータ収容部９８ｃに収容されたモータ２０を効率よく冷却することができる。 According to this, in the second configuration, the heat of the motor 20 is radiated to the outside through the exposed portion 132 provided on the swing arm cover 102. As a result, the motor 20 housed in the motor housing 98c of the swing arm 18 can be efficiently cooled.
　また、電動車両１０は、モータ２０に給電する給電線１３４をさらに有する。スイングアームカバー１０２は、給電線１３４を覆う。これにより、給電線１３４を保護しつつ、電動車両１０のデザイン性を向上させることができる。 The electric vehicle 10 further includes a power supply line 134 for supplying power to the motor 20. The swing arm cover 102 covers the power supply line 134. Thus, the design of the electric vehicle 10 can be improved while protecting the power supply line 134.
　この場合、給電線１３４は、モータ２０の前方に配置され、スイングアームカバー１０２は、給電線１３４を前方から覆う。これにより、電動車両１０の走行中、前方からの飛び石等から給電線１３４を保護することができる。 In this case, the power supply line 134 is disposed in front of the motor 20, and the swing arm cover 102 covers the power supply line 134 from the front. Thus, the power supply line 134 can be protected from stepping stones and the like from the front while the electric vehicle 10 is traveling.
　さらに、モータ２０は、三相の交流モータであり、給電線１３４は、交流モータに給電する三相線であればよい。これにより、電動車両１０を好適に走行させることができる。 Further, the motor 20 is a three-phase AC motor, and the power supply line 134 may be a three-phase line that supplies power to the AC motor. Thereby, the electric vehicle 10 can be suitably driven.
　さらにまた、露出部１３２は、モータケース９４の後部を外部に露出させる。これにより、前方からの飛び石等から給電線１３４を保護しつつ、モータ２０を冷却することができる。 Furthermore, the exposed part 132 exposes the rear part of the motor case 94 to the outside. Thus, the motor 20 can be cooled while protecting the power supply line 134 from a stepping stone or the like from the front.
　また、露出部１３２は、モータケース９４を電動車両１０の車幅方向に外部に露出させる。これにより、モータ２０の冷却効率をさらに向上させることができる。 露出 The exposed portion 132 exposes the motor case 94 to the outside in the vehicle width direction of the electric vehicle 10. Thereby, the cooling efficiency of the motor 20 can be further improved.
　さらに、露出部１３２は、電動車両１０の後方に向かう程、幅広になる。これにより、前方からの飛び石等からスイングアーム１８の内部を保護しつつ、モータ２０の冷却効率を向上させることができる。 Further, the exposed portion 132 becomes wider toward the rear of the electric vehicle 10. Thereby, the cooling efficiency of the motor 20 can be improved while protecting the inside of the swing arm 18 from stepping stones or the like from the front.
　さらにまた、スイングアームカバー１０２は、側面視で、モータケース９４の中心部分を覆う。これにより、回転角度検出部１１２やモータ軸９６等を保護することができる。 Furthermore, the swing arm cover 102 covers the central part of the motor case 94 in a side view. Thereby, the rotation angle detection unit 112, the motor shaft 96, and the like can be protected.
　また、露出部１３２は、側面視で、円弧状に形成されている。これにより、モータ２０を構成するステータ９０を効率よく冷却することができる。 露出 The exposed portion 132 is formed in an arc shape in a side view. Thereby, the stator 90 constituting the motor 20 can be efficiently cooled.
　さらにまた、モータケース９４の内部で固定されるステータ９０と、モータケース９４の内部で回転自在に軸支されるロータ９２とでモータ２０の駆動部が構成されている。そのため、第２の構成では、ステータ９０及びロータ９２を好適に冷却することができる。 Further, a driving portion of the motor 20 is constituted by a stator 90 fixed inside the motor case 94 and a rotor 92 rotatably supported inside the motor case 94. Therefore, in the second configuration, the stator 90 and the rotor 92 can be appropriately cooled.
　また、露出部１３２は、側面視で、ステータ９０に形成され、コイル９０ｃが巻回されるスロット９０ｂに対応するように設けられている。これにより、ステータ９０の冷却を一層効率よく行うことができる。すなわち、コイル９０ｃは、給電線１３４から供給される電力によって通電するため、モータ２０において、最も発熱量が大きな部品である。従って、コイル９０ｃに対応して露出部１３２を設けることで、ステータ９０を一層効率よく冷却することができる。 The exposed portion 132 is formed on the stator 90 in a side view, and is provided so as to correspond to the slot 90b around which the coil 90c is wound. Thereby, cooling of stator 90 can be performed more efficiently. That is, the coil 90c is a component that generates the largest amount of heat in the motor 20 because the coil 90c is energized by the power supplied from the power supply line 134. Therefore, by providing the exposed portion 132 corresponding to the coil 90c, the stator 90 can be cooled more efficiently.
　さらに、モータ２０は、モータケース９４がボルト（固定手段）１２８を介してモータ収容部９８ｃに固定されることで、モータ収容部９８ｃに収容される。露出部１３２は、ボルト１２８がスイングアームカバー１０２で覆われるように、モータケース９４の一部を外部に露出させる。これにより、ボルト１２８を隠して電動車両１０のデザイン性を向上させつつ、モータ２０の冷却を行うことができる。 (4) Further, the motor 20 is housed in the motor housing 98c by fixing the motor case 94 to the motor housing 98c via a bolt (fixing means) 128. The exposed part 132 exposes a part of the motor case 94 to the outside so that the bolt 128 is covered by the swing arm cover 102. Thus, the motor 20 can be cooled while the design of the electric vehicle 10 is improved by hiding the bolt 128.
＜３．３　第３の構成の効果＞
　第３の構成において、電動車両１０は、スイングアーム１８内の後輪１６の側方に設けられ、モータ２０を収容するモータ収容部９８ｃと、モータ２０に給電する給電線１３４とをさらに備える。この場合、スイングアーム１８の前端部（一端部９８ａ）における後輪１６の前方の箇所には、貫通孔１３８が形成される。給電線１３４は、スイングアーム１８内でモータ２０から前方に延び、一端部９８ａで電動車両１０の車幅方向の内側に曲がり、貫通孔１３８からスイングアーム１８の外部に延出される。 <3.3 Effect of Third Configuration>
In the third configuration, the electric vehicle 10 further includes a motor accommodating portion 98 c that is provided on the side of the rear wheel 16 in the swing arm 18 and accommodates the motor 20, and a power supply line 134 that supplies power to the motor 20. In this case, a through hole 138 is formed at the front end (one end 98 a) of the swing arm 18 at a location in front of the rear wheel 16. The power supply line 134 extends forward from the motor 20 in the swing arm 18, bends at one end 98 a in the vehicle width direction of the electric vehicle 10, and extends from the through hole 138 to the outside of the swing arm 18.
　これにより、給電線１３４は、モータ２０からスイングアーム１８の内部を通り、一端部９８ａに形成された貫通孔１３８から外部に延出される。この結果、スイングアーム１８の内部から外部に給電線１３４を配設する際、給電線１３４をあまり屈曲させることなく、より直線的に配設することができる。また、給電線１３４の外部への露出度が低くなるので、外部で給電線１３４を保護するための部品点数の削減や、外観性の向上を図ることもできる。さらに、スイングアーム１８の上方又は下方のスペースが確保されるので、例えば、ピボット軸５４の上方にバッテリ６２を搭載するスペースを確保することができる。この結果、スイングアーム１８の最低地上高を確保することができる。 Accordingly, the power supply line 134 extends from the motor 20 through the inside of the swing arm 18 to the outside through the through hole 138 formed in the one end 98a. As a result, when the power supply line 134 is provided from inside the swing arm 18 to the outside, the power supply line 134 can be provided more linearly without being bent so much. Further, since the degree of exposure of the power supply line 134 to the outside is reduced, the number of components for protecting the power supply line 134 externally can be reduced and the appearance can be improved. Further, since a space above or below the swing arm 18 is secured, a space for mounting the battery 62 above the pivot shaft 54 can be secured, for example. As a result, the minimum ground clearance of the swing arm 18 can be secured.
　また、ピボット軸５４の車幅方向の両端部には、２つの軸受１００が設けられている。一端部９８ａは、２つの軸受１００を介してピボット軸５４に軸支される。貫通孔１３８は、一端部９８ａにおける２つの軸受１００の間の箇所に形成され、給電線１３４は、２つの軸受１００の間から貫通孔１３８を介してスイングアーム１８の外部に延出される。 に は Two bearings 100 are provided at both ends of the pivot shaft 54 in the vehicle width direction. One end 98a is pivotally supported by the pivot shaft 54 via two bearings 100. The through hole 138 is formed at a position between the two bearings 100 at the one end 98 a, and the power supply line 134 extends to the outside of the swing arm 18 through the through hole 138 between the two bearings 100.
　このように、給電線１３４は、車幅方向の外側ではなく、車幅方向の内側で外部に露出する。これにより、電動車両１０のコーナリング時に該電動車両１０を傾けた場合、路面への給電線１３４の接触が回避されるので、電動車両１０のバンク角を確保することが可能となる。 As described above, the power supply line 134 is exposed to the outside in the vehicle width direction, not in the vehicle width direction. Thus, when the electric vehicle 10 is tilted at the time of cornering of the electric vehicle 10, contact of the power supply line 134 with the road surface is avoided, so that the bank angle of the electric vehicle 10 can be secured.
　さらに、貫通孔１３８は、一端部９８ａにおけるピボット軸５４の上方の箇所に形成され、給電線１３４は、ピボット軸５４の上方から貫通孔１３８を介してスイングアーム１８の外部に延出される。これにより、スイングアーム１８を含めた電動車両１０の最低地上高を確保することができる。 Furthermore, the through hole 138 is formed at a position above the pivot shaft 54 at the one end 98a, and the power supply line 134 extends outside the swing arm 18 from above the pivot shaft 54 via the through hole 138. Thereby, the minimum ground clearance of the electric vehicle 10 including the swing arm 18 can be secured.
　さらにまた、スイングアーム１８内の貫通孔１３８とモータ収容部９８ｃとの間には、リブ１４６が設けられている。これにより、スイングアーム１８の機械的強度を補強することができる。 Further, a rib 146 is provided between the through hole 138 in the swing arm 18 and the motor housing 98c. Thereby, the mechanical strength of the swing arm 18 can be reinforced.
　また、電動車両１０は、モータ２０に配置され、モータ２０の回転角度を検出する回転角度検出部１１２と、回転角度検出部１１２から延出する通信線１３６とをさらに備える。この場合、通信線１３６は、給電線１３４に這わせるように、スイングアーム１８内で回転角度検出部１１２から前方に延び、一端部９８ａで車幅方向の内側に曲がり、貫通孔１３８からスイングアーム１８の外部に延出される。これにより、給電線１３４と共に、スイングアーム１８内の屈曲を少なくして、外部への露出を避けつつ、外観性を向上させることができる。 The electric vehicle 10 further includes a rotation angle detection unit 112 that is disposed on the motor 20 and detects a rotation angle of the motor 20, and a communication line 136 extending from the rotation angle detection unit 112. In this case, the communication line 136 extends forward from the rotation angle detection unit 112 in the swing arm 18 so as to crawl along the power supply line 134, bends inward in the vehicle width direction at one end 98 a, 18 extend outside. Thereby, the bending inside the swing arm 18 together with the power supply line 134 can be reduced, and the appearance can be improved while avoiding exposure to the outside.
　また、電動車両１０は、スイングアーム１８内で給電線１３４をスイングアーム１８に固定するステー１４２をさらに備える。これにより、スイングアーム１８の内部で直線的に配設された給電線１３４を保持することができる。 The electric vehicle 10 further includes a stay 142 for fixing the power supply line 134 to the swing arm 18 in the swing arm 18. Thus, the power supply line 134 linearly arranged inside the swing arm 18 can be held.
　さらに、スイングアーム１８の底部には、水抜き用の孔１４４が形成されている。これにより、貫通孔１３８を介してスイングアーム１８内に浸入した液体は、孔１４４を介して下方に落下する。この結果、水等の液体に起因する給電線１３４の短絡等の発生を回避することができる。 Further, a hole 144 for draining water is formed at the bottom of the swing arm 18. Thus, the liquid that has entered the swing arm 18 through the through hole 138 drops downward through the hole 144. As a result, it is possible to avoid occurrence of a short circuit or the like of the power supply line 134 due to a liquid such as water.
　また、電動車両１０は、車体フレーム２２に支持されるバッテリ６２及びＰＣＵ（電子部品）６６をさらに有する。給電線１３４は、貫通孔１３８から外部に引き出されてＰＣＵ６６に接続される。ＰＣＵ６６は、バッテリ６２から供給される電力を、給電線１３４を介してモータ２０に供給する。これにより、ＰＣＵ６６からモータ２０に電力を供給して該モータ２０を駆動させることができる。 The electric vehicle 10 further includes a battery 62 and a PCU (electronic component) 66 supported by the body frame 22. The power supply line 134 is drawn out of the through-hole 138 and connected to the PCU 66. The PCU 66 supplies the electric power supplied from the battery 62 to the motor 20 via the power supply line 134. Thus, electric power can be supplied from the PCU 66 to the motor 20 to drive the motor 20.
　この場合、モータ２０が交流モータであり、給電線１３４が交流モータに給電する三相線であるため、電動車両１０を適切に走行させることができる。 In this case, since the motor 20 is an AC motor, and the power supply line 134 is a three-phase line that supplies power to the AC motor, the electric vehicle 10 can run properly.
＜３．４　第４の構成の効果＞
　第４の構成において、電動車両１０は、モータ２０の駆動力を後輪１６に伝達する減速機１１４と、スイングアーム１８に設けられ、減速機１１４を収容する減速機収容部１１６と、減速機収容部１１６から延出するブリーザチューブ１４８とを備える。ブリーザチューブ１４８の一端部１４８ａは、減速機収容部１１６に連通する。ブリーザチューブ１４８の他端部１４８ｂは、スイングアーム１８の上方で、スイングアーム１８と共に揺動可能なフェンダ６０（電動車両１０の部品）に配置されている。 <3.4 Effect of Fourth Configuration>
In the fourth configuration, the electric vehicle 10 includes a speed reducer 114 that transmits the driving force of the motor 20 to the rear wheel 16, a speed reducer housing 116 that is provided on the swing arm 18 and houses the speed reducer 114, A breather tube 148 extending from the storage section 116. One end 148 a of the breather tube 148 communicates with the reduction gear housing 116. The other end 148 b of the breather tube 148 is disposed above the swing arm 18 on a fender 60 (a component of the electric vehicle 10) that can swing together with the swing arm 18.
　これにより、ブリーザチューブ１４８の他端部１４８ｂが上向きに配置されているので、ブリーザチューブ１４８内で液化した潤滑油は、ブリーザチューブ１４８の一端部１４８ａを介して減速機収容部１１６に戻る。この結果、液化した潤滑油が外部に排出されることはないので、電動車両１０等が汚れることを回避することができる。 Since the other end 148b of the breather tube 148 is thereby arranged upward, the lubricating oil liquefied in the breather tube 148 returns to the reduction gear housing 116 via the one end 148a of the breather tube 148. As a result, the liquefied lubricating oil is not discharged to the outside, so that the electric vehicle 10 and the like can be prevented from being contaminated.
　また、減速機収容部１１６及びブリーザチューブ１４８は、モータ２０と後輪１６との間に配置されている。これにより、モータ２０と後輪１６との間の空間を有効活用することができる。 減速 Further, the reduction gear housing 116 and the breather tube 148 are arranged between the motor 20 and the rear wheel 16. Thereby, the space between the motor 20 and the rear wheel 16 can be effectively utilized.
　さらに、ブリーザチューブ１４８は、スイングアーム１８の減速機収容部１１６の近傍に設けられた上壁部１７０に沿って配置されている。これにより、電動車両１０の走行中の飛び石等からブリーザチューブ１４８を保護しつつ、走行風でブリーザチューブ１４８を冷却することができる。また、上壁部１７０に配置することで、走行時の振動によりブリーザチューブ１４８がばたついても、後輪１６と接触しないようにすることができる。 Furthermore, the breather tube 148 is arranged along the upper wall 170 provided near the speed reducer housing 116 of the swing arm 18. Thus, the breather tube 148 can be cooled by the traveling wind while protecting the breather tube 148 from flying stones or the like while the electric vehicle 10 is traveling. Further, by arranging the breather tube 148 in the upper wall 170, even if the breather tube 148 flaps due to vibration during traveling, it can be prevented from contacting the rear wheel 16.
　この場合、上壁部１７０は、ブリーザチューブ１４８の他端部１４８ｂが一端部１４８ａよりも高くなるように傾斜している。これにより、ブリーザチューブ１４８が冷却することで、気体が潤滑油に液化した場合でも、潤滑油は、ブリーザチューブ１４８の一端部１４８ａから減速機収容部１１６に戻る。この結果、ブリーザチューブ１４８の他端部１４８ｂから外部に潤滑油が排出されることを回避することができる。 In this case, the upper wall 170 is inclined so that the other end 148b of the breather tube 148 is higher than the one end 148a. Thus, even when the gas is liquefied into lubricating oil by cooling the breather tube 148, the lubricating oil returns to the reduction gear housing 116 from one end 148a of the breather tube 148. As a result, it is possible to prevent the lubricating oil from being discharged from the other end 148b of the breather tube 148 to the outside.
　また、上壁部１７０には、ブリーザチューブ１４８をスイングアーム１８及び上壁部１７０に固定するための固定部１７２が設けられている。これにより、ブリーザチューブ１４８が後輪１６に巻き込まれることを防止することができる。 The upper wall 170 is provided with a fixing portion 172 for fixing the breather tube 148 to the swing arm 18 and the upper wall 170. Thereby, the breather tube 148 can be prevented from being caught in the rear wheel 16.
　さらに、ブリーザチューブ１４８は、出口である他端部１４８ｂを上向きに指向した状態で配置されている。これにより、ブリーザチューブ１４８の出口から外部に潤滑油が排出されることを確実に防止することができる。 Furthermore, the breather tube 148 is arranged with the other end 148b, which is the outlet, directed upward. Accordingly, it is possible to reliably prevent the lubricating oil from being discharged from the outlet of the breather tube 148 to the outside.
　さらにまた、ブリーザチューブ１４８は、入口である一端部１４８ａを下向きに指向した状態で配置されている。これにより、ブリーザチューブ１４８内で液化した潤滑油を確実に減速機収容部１１６に戻すことができる。 Furthermore, the breather tube 148 is disposed with the one end 148a, which is the entrance, directed downward. Thus, the lubricating oil liquefied in the breather tube 148 can be reliably returned to the reduction gear housing 116.
　また、ブリーザチューブ１４８の出口である他端部１４８ｂは、フェンダ６０の側面に配置されている。これにより、ブリーザチューブ１４８の他端部１４８ｂを簡単に固定することができる。 他 端 The other end 148b, which is the outlet of the breather tube 148, is disposed on the side surface of the fender 60. Thus, the other end 148b of the breather tube 148 can be easily fixed.
　この場合、ブリーザチューブ１４８と後輪１６の間には、板部材１７４が配置されている。これにより、ブリーザチューブ１４８の他端部１４８ｂがフェンダ６０から外れたときに、ブリーザチューブ１４８が後輪１６に巻き込まれることを回避すると共に、出口から排出された潤滑油が後輪１６に付着することを回避することができる。 In this case, a plate member 174 is disposed between the breather tube 148 and the rear wheel 16. Thus, when the other end 148b of the breather tube 148 comes off the fender 60, the breather tube 148 is prevented from being caught in the rear wheel 16, and the lubricating oil discharged from the outlet adheres to the rear wheel 16. That can be avoided.
　さらに、板部材１７４は、フェンダ６０と一体に成形されている。これにより、板部材１７４を容易に設けることができる。 Furthermore, the plate member 174 is formed integrally with the fender 60. Thereby, the plate member 174 can be easily provided.
　さらにまた、ブリーザチューブ１４８の入口である一端部１４８ａは、モータ２０のモータ軸９６と、モータ軸９６からの駆動力を後輪１６に伝達する車軸（出力軸）１６ａとの間に設けられている。これにより、減速機収容部１１６内の温度上昇による内圧の上昇で、霧状の潤滑油を含む気体が発生した際に、当該気体を外部に効率よく排出することができる。 Further, one end 148a, which is an inlet of the breather tube 148, is provided between a motor shaft 96 of the motor 20 and an axle (output shaft) 16a that transmits a driving force from the motor shaft 96 to the rear wheel 16. I have. Thus, when a gas containing mist-like lubricating oil is generated due to an increase in internal pressure due to a rise in temperature inside the reduction gear housing 116, the gas can be efficiently discharged to the outside.
　この場合、ブリーザチューブ１４８の入口は、モータ軸９６から車軸１６ａに駆動力を伝達する減速機１１４の中間軸１５６と、車軸１６ａとの間に設けられている。これにより、霧状の潤滑油を含む気体を外部に一層効率よく排出することができる。 In this case, the inlet of the breather tube 148 is provided between the axle 16a and the intermediate shaft 156 of the speed reducer 114 that transmits the driving force from the motor shaft 96 to the axle 16a. Thereby, the gas containing the mist-like lubricating oil can be more efficiently discharged to the outside.
　以上、本発明について好適な実施形態を用いて説明したが、本発明の技術的範囲は、上記の実施形態の記載範囲に限定されることはない。上記の実施形態に、多様な変更又は改良を加えることが可能であることは、当業者に明らかである。そのような変更又は改良を加えた形態も、本発明の技術的範囲に含まれ得ることが、請求の範囲の記載から明らかである。また、請求の範囲に記載された括弧書きの符号は、本発明の理解の容易化のために添付図面中の符号に倣って付したものであり、本発明がその符号をつけた要素に限定されて解釈されるものではない。 Although the present invention has been described using the preferred embodiments, the technical scope of the present invention is not limited to the description of the above embodiments. It is apparent to those skilled in the art that various changes or improvements can be made to the above embodiment. It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention. Further, the reference numerals in parentheses described in the claims are given according to the reference numerals in the accompanying drawings for easy understanding of the present invention, and the present invention is limited to the elements with the reference numerals. It is not interpreted.

Claims (12)

  1. 　車体フレーム（２２）と、前記車体フレーム（２２）に設けられたピボット軸（５４）と、一端部が前記ピボット軸（５４）に軸支され、他端部が後輪（１６）を支持するスイングアーム（１８）と、前記スイングアーム（１８）に配置され、前記後輪（１６）を駆動するモータ（２０）と、前記モータ（２０）の駆動力を前記後輪（１６）に伝達する減速機（１１４）とを備える電動車両（１０）において、
    　前記スイングアーム（１８）に設けられ、前記減速機（１１４）を収容する減速機収容部（１１６）と、前記減速機収容部（１１６）から延出するブリーザチューブ（１４８）とをさらに備え、
    　前記ブリーザチューブ（１４８）の一端部（１４８ａ）は、前記減速機収容部（１１６）に連通し、
    　前記ブリーザチューブ（１４８）の他端部（１４８ｂ）は、前記スイングアーム（１８）の上方で、前記スイングアーム（１８）と共に揺動可能な前記電動車両（１０）の部品（６０）に配置されている、電動車両（１０）。     A vehicle body frame (22), a pivot shaft (54) provided on the vehicle body frame (22), one end of which is pivotally supported by the pivot shaft (54), and the other end of which supports the rear wheel (16). A swing arm (18), a motor (20) disposed on the swing arm (18) for driving the rear wheel (16), and transmitting a driving force of the motor (20) to the rear wheel (16). In an electric vehicle (10) including a speed reducer (114),
    A speed reducer housing (116) provided on the swing arm (18) and housing the speed reducer (114); and a breather tube (148) extending from the speed reducer housing (116).
    One end (148a) of the breather tube (148) communicates with the reduction gear housing (116),
    The other end (148b) of the breather tube (148) is disposed above the swing arm (18) on a component (60) of the electric vehicle (10) that can swing together with the swing arm (18). The electric vehicle (10).
  2. 　請求項１記載の電動車両（１０）において、
    　前記減速機収容部（１１６）及び前記ブリーザチューブ（１４８）は、前記モータ（２０）と前記後輪（１６）との間に配置されている、電動車両（１０）。     The electric vehicle (10) according to claim 1,
    The electric vehicle (10), wherein the reduction gear housing (116) and the breather tube (148) are arranged between the motor (20) and the rear wheel (16).
  3. 　請求項２記載の電動車両（１０）において、
    　前記ブリーザチューブ（１４８）は、前記スイングアーム（１８）の前記減速機収容部（１１６）の近傍に形成された上壁部（１７０）に沿って配置されている、電動車両（１０）。     The electric vehicle (10) according to claim 2,
    The electric vehicle (10), wherein the breather tube (148) is disposed along an upper wall (170) formed near the speed reducer housing (116) of the swing arm (18).
  4. 　請求項３記載の電動車両（１０）において、
    　前記上壁部（１７０）は、前記ブリーザチューブ（１４８）の他端部（１４８ｂ）が一端部（１４８ａ）よりも高くなるように傾斜している、電動車両（１０）。     The electric vehicle (10) according to claim 3,
    The electric vehicle (10), wherein the upper wall (170) is inclined such that the other end (148b) of the breather tube (148) is higher than one end (148a).
  5. 　請求項３又は４記載の電動車両（１０）において、
    　前記上壁部（１７０）には、前記ブリーザチューブ（１４８）を前記スイングアーム（１８）及び前記上壁部（１７０）に固定するための固定部（１７２）が設けられている、電動車両（１０）。     The electric vehicle (10) according to claim 3 or 4,
    The electric vehicle () includes a fixing portion (172) for fixing the breather tube (148) to the swing arm (18) and the upper wall portion (170) on the upper wall portion (170). 10).
  6. 　請求項１～５のいずれか１項に記載の電動車両（１０）において、
    　前記ブリーザチューブ（１４８）は、該ブリーザチューブ（１４８）の出口である前記他端部（１４８ｂ）を上向きに指向した状態で配置されている、電動車両（１０）。     The electric vehicle (10) according to any one of claims 1 to 5,
    The electric vehicle (10), wherein the breather tube (148) is arranged so that the other end (148b), which is an outlet of the breather tube (148), faces upward.
  7. 　請求項１～６のいずれか１項に記載の電動車両（１０）において、
    　前記ブリーザチューブ（１４８）は、該ブリーザチューブ（１４８）の入口である前記一端部（１４８ａ）を下向きに指向した状態で配置されている、電動車両（１０）。     The electric vehicle (10) according to any one of claims 1 to 6,
    The electric vehicle (10), wherein the breather tube (148) is disposed with the one end (148a) serving as an inlet of the breather tube (148) facing downward.
  8. 　請求項１～７のいずれか１項に記載の電動車両（１０）において、
    　前記部品（６０）は、前記後輪（１６）のフェンダであり、
    　前記ブリーザチューブ（１４８）の出口である前記他端部（１４８ｂ）は、前記フェンダ（６０）の側面に配置されている、電動車両（１０）。     The electric vehicle (10) according to any one of claims 1 to 7,
    The part (60) is a fender of the rear wheel (16);
    The electric vehicle (10), wherein the other end (148b) serving as an outlet of the breather tube (148) is disposed on a side surface of the fender (60).
  9. 　請求項８記載の電動車両（１０）において、
    　前記ブリーザチューブ（１４８）と前記後輪（１６）の間には、板部材（１７４）が配置されている、電動車両（１０）。     The electric vehicle (10) according to claim 8,
    The electric vehicle (10), wherein a plate member (174) is disposed between the breather tube (148) and the rear wheel (16).
  10. 　請求項９記載の電動車両（１０）において、
    　前記板部材（１７４）は、前記フェンダ（６０）と一体に成形されている、電動車両（１０）。     The electric vehicle (10) according to claim 9,
    The electric vehicle (10), wherein the plate member (174) is formed integrally with the fender (60).
  11. 　請求項１～１０のいずれか１項に記載の電動車両（１０）において、
    　前記ブリーザチューブ（１４８）の入口である前記一端部（１４８ａ）は、前記モータ（２０）のモータ軸（９６）と、前記モータ軸（９６）からの前記駆動力を前記後輪（１６）に伝達する前記減速機（１１４）の出力軸（１６ａ）との間に設けられている、電動車両（１０）。     The electric vehicle (10) according to any one of claims 1 to 10,
    The one end (148a), which is an inlet of the breather tube (148), transmits the driving force from the motor shaft (96) of the motor (20) to the rear wheel (16). An electric vehicle (10) provided between the transmission and the output shaft (16a) of the speed reducer (114).
  12. 　請求項１１記載の電動車両（１０）において、
    　前記入口は、前記駆動力を前記モータ軸（９６）から前記出力軸（１６ａ）に伝達する前記減速機（１１４）の中間軸（１５６）と、前記出力軸（１６ａ）との間に設けられている、電動車両（１０）。     The electric vehicle (10) according to claim 11,
    The inlet is provided between an intermediate shaft (156) of the speed reducer (114) that transmits the driving force from the motor shaft (96) to the output shaft (16a), and the output shaft (16a). The electric vehicle (10).
PCT/JP2019/037817 2018-09-27 2019-09-26 Electric vehicle WO2020067268A1 (en)

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