JP2012101701A - Cooling duct laying structure of saddle riding type electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling duct laying structure of a saddle riding type electric vehicle which can suppress a distortion.SOLUTION: In a rear part of a vehicle body frame 5, a power unit for generating a travelling and driving force of the vehicle is provided through a swing joint 17. The power unit is supported by a joint shaft 19 of a joint case 18. The power unit includes a battery 51 and a travelling and driving motor 32. A pair of right and left driving wheels 8R and 8L are connected to the power unit. A rear cushion 21 is interposed in a central part in the direction of a vehicle width between the rear part of the vehicle body frame 5 and the power unit. A battery case 50 is provided for accommodating the battery 51. A flexible cooling duct 70 for supplying cooling air to an inner part of the battery case 50 is connected to the battery case 50. The flexible cooling duct 70 is extended toward a front side along the joint shaft 19 under a state of proximity to the joint shaft 19.

Description

  The present invention relates to a cooling duct arrangement structure for a saddle-ride type electric vehicle such as an electric three-wheeled vehicle.

  Conventionally, an electric three-wheeled vehicle using a motor as a drive source is known. In this electric three-wheeled vehicle, a battery support frame is supported at the rear of the floor of the body frame via a rolling joint so as to be swingable in the left-right direction. The front end of the swing arm is supported at the front portion of the battery support frame so as to be swingable in the vertical direction, and the rear wheel is pivotally supported at the rear end of the swing arm. The swing arm includes an electric motor and a transmission, and constitutes a swing unit together with a rear wheel (see Patent Document 1).

JP-A-6-255557

  In the conventional electric three-wheeled vehicle described above, a passage for sending out the discharge air from the fan is required to cool the battery. On the other hand, it is conceivable to extend the cooling duct for introducing cooling air from the battery to the outside. However, since the battery support frame is supported so as to be swingable with respect to the vehicle body frame, it extends toward the vehicle body frame side. There is a problem that the ducts are twisted to buffer the surrounding parts and to be damaged by the buffering.

  Accordingly, an object of the present invention is to provide a cooling duct routing structure for a saddle-ride type electric vehicle capable of suppressing torsional displacement of a cooling duct that guides cooling air for cooling a battery.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a power unit (9) for generating a vehicle driving force at a rear portion of a vehicle body frame (5) via a swing joint (17). A joint case (18) in which the joint (17) is supported by the body frame (5) via a swing shaft (S) so as to be movable up and down, and swings in the left-right direction with respect to the joint case (18). A joint shaft (19) that can be supported, and the power unit (9) is supported by the joint shaft (19). The power unit (9) is a battery (51) as a travel drive source, and the battery. A drive motor (32) for driving the drive wheels (8R, 8L) with the electric power supplied from (51), and the power unit A pair of left and right drive wheels (8R, 8L) are connected to the rear wheel (9), and a rear cushion (21) is provided between the rear portion of the vehicle body frame (5) and the power unit (9) in the center in the vehicle width direction. ), A battery case (50) for housing the battery (51) is provided, and flexible cooling is performed to supply cooling air to the battery case (50) into the battery case (50). A duct (70) is connected, and the cooling duct (70) extends along the joint shaft (19) toward the front side in a state of being close to the joint shaft (19).

  The invention described in claim 2 is characterized in that the cooling duct (70) extends forward across the swing axis (S).

  The invention described in claim 3 is characterized in that the cooling duct (70A) extends upward along the rear cushion (21).

  The invention described in claim 4 is characterized in that a clamper (101) is provided behind the rear cushion (21), and a cooling duct (70A) is held by the clamper (101).

  According to a fifth aspect of the present invention, the rear cushion (21) includes a U-shaped cushion bracket (106) at the lower end, and a cooling duct (70B) is inserted into the cushion bracket (106). And

  The invention described in claim 6 is characterized in that a cooling duct (70C) is formed inside the swing joint (17).

According to the first aspect of the present invention, since the cooling duct connected to the battery case extends close to the joint shaft and along the joint shaft, the left and right sides of the joint frame are centered on the axis of the joint shaft. Even if the power unit swings in the direction, the cooling duct can be kept from being displaced about the axis of the joint shaft relative to the vehicle body frame (in the rolling direction) to a minimum. Therefore, it is possible to prevent the cooling duct from being twisted and buffering with peripheral components.
According to the second aspect of the invention, the cooling duct extending forward across the swing axis does not change at the tip end even with respect to the swing operation of the power unit, and is slightly curved near the swing axis. Stop. Further, even if the front end side of the cooling duct is fixed, it is possible to absorb the twist as a whole with respect to the swing operation and the rolling operation of the power unit, and it is possible to prevent a load from being applied due to the local twist.
According to the third aspect of the present invention, when extending upward along the rear cushion arranged in the vertical direction, cooling air can be sucked from above, which is advantageous in preventing water from entering. It is.
According to the fourth aspect of the invention, the cooling duct is easily routed and the cooling duct can be held with a simple structure.
According to the fifth aspect of the present invention, the cooling duct can be held by effectively using the cushion bracket for supporting the lower end of the rear cushion.
According to the sixth aspect of the present invention, the joint shaft of the swinging swing joint and the joint case of the swinging swing joint itself serve as a cooling duct. Therefore, if a connecting part with a battery case that does not have a relative twist with respect to the joint shaft is connected, the connecting part will not be twisted, and the body frame without a relative twist with respect to the joint case. If the connecting portions are connected, the connecting portions are not twisted.
Accordingly, there is no portion that twists over the entire cooling duct formed by both the connecting portions and the swing joint, and the durability is greatly improved.

1 is a side view of an electric three-wheel vehicle according to an embodiment of the present invention. It is a principal part enlarged view of the loading platform vicinity of FIG. It is a principal part enlarged view of FIG. FIG. 4 is a plan view of FIG. 3. It is sectional drawing which follows the AA line of FIG. FIG. 6 is an enlarged view of FIG. 5. It is a rear view which shows a rear fender in cross section. It is sectional drawing of the battery case of the charging connector vicinity. It is a perspective view of the battery case near a charging connector. It is a block diagram which shows electric equipment. It is a side view equivalent to FIG. 3 of 2nd Embodiment. It is a top view equivalent to FIG. 4 of 2nd Embodiment. It is a side view equivalent to FIG. 3 of 3rd Embodiment. It is a principal part perspective view of 3rd Embodiment. It is principal part sectional drawing of 4th Embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, an electric three-wheeled vehicle 1 as a saddle-ride type electric vehicle is a battery-driven electric vehicle having a wind screen 2 on the front surface and a low floor type floor 3 on the bottom surface. And a cabin 4 with a roof. The electric three-wheeled vehicle 1 includes a vehicle body frame 5 formed in a U shape when viewed from the side.

  The vehicle body frame 5 includes a single front frame 5f that extends obliquely downward from the front end, a pair of left and right lower frames 5b that are divided into left and right at the lower end of the front, and extend rearward in parallel with each other along the floor 3. The rear frame 5r extends obliquely upward from the rear end of the frame 5b, and the loading frame 5n extends slightly rearward and upward from the rear end of each rear frame 5r. A front wheel 7 is supported at the front end portion of the front frame 5f via a steering mechanism 6, and the left and right rear wheels 8L and 8R are driven at the center of the rear portion of the lower frame 5b in the vehicle width direction to generate a driving force. The power unit 9 is supported to be swingable. A loading platform 11 is provided on the loading platform frame 5n. Therefore, the loading platform 11 is positioned above the power unit, and the rear wheels 8R and 8L, which are driving wheels, are disposed in the vicinity of the power unit 9. The seat 10 is supported by the lower frame 5b and the rear frame 5r.

  As shown in FIG. 2, the loading platform 11 located above the power unit 9, that is, above the battery unit 31 described later, is supported by a hinge 69 provided on the base side of the loading platform 11 so as to be rotatable upward. Yes. Specifically, the loading platform frame 5n of the vehicle body frame 5 is divided into the front and rear together with the loading platform 11 itself on the base side of the loading platform 11, and a hinge 69 is provided at this divided portion. When the loading platform 11 is in a horizontal posture, the divided parts of the loading platform frame 5n interfere with each other and further rotation is restricted, and the loading platform 11 is in a vertical posture, and the loading platform frame 5n is moved by a hook (not shown). It is fixed and can maintain a vertical state. In this state, a lid 58 of a battery case 50 described later is opened to perform internal maintenance. When the loading platform 11 is in a horizontal state, the divided parts of the loading platform frame 5n interfere with each other and further rotation of the loading platform 11 is restricted. Therefore, the downward load applied to the loading platform 11 in the horizontal posture is reduced. Can support. Here, a storage box 22 is installed on the loading platform 11 (not shown in FIGS. 2 and 3).

The steering mechanism 6 has a head pipe 12 attached to the front end of the front frame 5f and extending in the vertical direction. A steering shaft (not shown) is rotatably attached to the head pipe 12. A front fork 13 is attached to the lower end of the steering shaft, and the front wheel 7 is supported on the lower end of the front fork 13.
A handle post 14 is attached to the upper end of the steering shaft, and a handle 15 is attached to the upper end of the handle post 14.

  As shown in FIGS. 3 and 4, a link 16 extending downward between the rear ends of the lower frames 5b and 5b is swingable in a predetermined angle range in the front-rear direction with respect to the lower frames 5b and 5b. It is attached. A swing joint 17 extending rearward along the center in the vehicle width direction is attached to the swing shaft S at the lower end of the link 16 so as to be swingable in the vertical direction with respect to the link 16.

  The swing joint 17 is rotatable relative to the joint case 18 with a joint case 18 having one end supported by the link 16 and an axis R that is inserted into the other end side of the joint case 18 and extends rearward. A joint shaft 19 is provided. The joint shaft 19 and the lower wall 45 (see FIG. 5) of the power unit 9 are connected by a pair of left and right hanger plates 20 and 20. As a result, the joint shaft 19, that is, the power unit 9 is supported by the joint case 18 of the swing joint 17 so as to be swingable in the left-right direction around the axis R of the joint shaft 19.

  A lower bracket 23 is provided on the upper part of the joint case 18 of the swing joint 17. A cross member (not shown) is stretched over the rear frames 5r, 5r, and an upper bracket 24 is provided at the center of the cross member in the vehicle width direction. A rear cushion 21 is attached between the upper bracket 24 and the lower bracket 23.

  The power unit 9 includes a motor unit 30 disposed at a lower portion and a battery unit 31 disposed at an upper portion of the motor unit 30 and fixed to the motor unit 30 with a connecting bolt 28. The upper part of each hanger plate 20 is fixed to the front part of the lower wall 45 of the motor unit 30 at upper and lower parts by upper bolts 25 and 25, and the lower part of each hanger plate 20 is attached to the rear part of the joint shaft 19 by lower bolts 26 and 26. It is attached to the part 27 (see FIG. 5) at two places on the front and rear.

  Thus, the motor unit 30 is supported by the swing joint 17 via the link 16 so as to be swingable in the vertical direction. Therefore, the power unit 9 in which the motor unit 30 and the battery unit 31 fixed to the motor unit 30 with the connecting bolts 28 are integrated can swing up and down with respect to the vehicle body frame 5 via the swing axis S. It is supported so as to be swingable in the left-right direction around the axis R via the joint shaft 19.

  As shown in FIGS. 5 and 6, the motor unit 30 includes a travel drive motor 32 for driving the rear wheels 8R and 8L, a differential gear 37 linked to the rear wheels 8R and 8L, and the motor 32 and the differential gear. 37 is mainly provided with an aluminum die-cast motor case 33 that accommodates the housing 37.

  The motor 32 is a three-phase AC motor, and is arranged behind the axle 34 of the rear wheels 8R and 8L and on the right side of the center in the vehicle left-right direction. A carrier of a differential gear 37 is linked to a pinion 35 of the motor 32 via a counter gear 36. Left and right final shafts 38 and 38 are attached to left and right side gears of the differential gear 37, and rear wheels 8R and 8L are attached to the left and right final shafts 38 and 38, respectively. The left and right final shafts 38, 38 constitute an axle 34. Here, the differential gear 37 is arranged on the left side of the center in the left-right direction of the vehicle, and reduces the deviation of the weight balance in the vehicle width direction with the motor 32 that is also a heavy object.

The motor case 33 is a member having an opening at least on the front side and is provided with a case mounting seat 39 on the upper peripheral edge (the rear portion may be closed). The case mounting seat 39 is attached to the battery unit 31 by tightening the connecting bolt 28 inserted into the battery unit 31. The motor case 33 has a rear right side protruding rearward as an arrangement site of the motor 32, and includes differential bearings 42 below the side walls 41. A housing recess 44 for receiving a front portion of the battery case 50 and a bulging portion 60 described later is provided at the front portion of the motor case 33.
The motor case 33 includes a case attachment seat 39 to which the peripheral wall of the battery case 50 is attached to the side wall 41. The lower wall 45 in the front part of the housing recess 44 is provided with a fixing part (not shown) in which the upper part of each hanger plate 20 is fixed at upper and lower parts by upper bolts 25, 25. A guide rail 29 is provided on the inner wall of the housing recess 44 in the vertical direction.

  As shown in FIG. 6, a bulging portion 46 that protrudes outward around the final shaft 38 is provided at the rear portion of the left side wall 41 of the motor case 33, and a part of the differential gear 37 is provided in the bulging portion 46. Contained. Corresponding to this bulging portion 46, the spoke portion 47 of the left rear wheel 8L is formed so as to be shifted outward from the center in the width direction of the tire, and the swelling of the spoke portion 47 and the side wall 41 of the left rear wheel 8L. A drum brake device 48 is arranged using a space between the inner surface of the protruding portion 46. The drum brake device 48 presses the drum 49 provided on the spoke portion 47 of the rear wheel 8L with a shoe 49a.

  As a result, a part of the differential gear 37 enters the tire width of the left rear wheel 8L together with the drum brake device 48. The right side wall 41 is also provided with a bulging portion 46, and the spoke portion 47 of the right rear wheel 8L is also formed so as to be shifted outward from the center in the width direction of the tire, and the spoke portion of the right rear wheel 8L. A drum brake device 48 is arranged in a space between 47 and the inner surface of the bulging portion 46 of the side wall 41.

  As shown in FIGS. 3 and 4, the battery unit 31 includes a battery case 50 and a lithium ion type battery 51 accommodated in the battery case 50. The battery 51 is dropped between the left and right rear wheels 8R, 8L on the upper battery 52 positioned above the axle 34 of the rear wheels 8R, 8L and the lower part on the front side of the upper battery 52, and on the front side of the axle 34. It is comprised by the lower battery 53 (it comprises some batteries 51) arrange | positioned. Therefore, the motor 32 and the lower battery 53 are arranged separately on the front side of the axle 34 of the rear wheels 8R and 8L and the rear side of the axle 34 of the rear wheels 8R and 8L.

  The upper battery 52 is disposed in front of the rear ends of the rear wheels 8R and 8L. Here, the battery 51 is configured by connecting two upper batteries 52 and one lower battery 53 in series. Each of the upper battery 52 and the lower battery 53 is configured by connecting a plurality of battery cells in series. The upper batteries 52, 52 and the lower battery 53 are connected in series, generate a high voltage of, for example, 48V to 72V, and are charged by electric power supplied from a charging connector 80 described later.

  The battery case 50 includes a case main body 54 having an opening 55 at the top and a lid 58 that closes the opening 55. A bulging portion 60 is formed on the bottom wall 75 of the front portion of the case body 54 so as to protrude downward so as to accommodate the lower battery 53 corresponding to the lower battery 53. Sliders 61 are respectively attached to the outer surfaces of both side walls of the bulging portion 60 in the vertical direction. The slider 61 is fitted to a guide rail 29 provided on the inner wall of the housing recess 44 of the motor case 33 so as to be slidable in the vertical direction.

  A cooling fan 71 that sucks and discharges internal air for cooling the upper battery 52 and the lower battery 53 and a discharge duct 72 that opens rearward are integrally formed at the rear portion of the lid 58 at the center in the vehicle width direction. ing.

As shown in FIG. 7, the left and right side walls 62, 62 other than the bulging portion 60 of the case main body 54 are disposed inside the rear wheels 8 R, 8 L and close to the rear wheels 8 R, 8 L, and A part is configured as an inner fender 63 of the rear wheels 8R and 8L.
A flange portion 56 is formed on the periphery of the opening 55 of the case body 54. A lid 58 is fixed to the flange portion 56 with a bolt 59 via a seal material 57. Therefore, the opening 55 is opened by removing the bolt 59 and removing the lid 58, and the opening 55 can be closed by the lid 58 when the bolt 59 is tightened.

The flange portion 56 includes a flange extension portion 65 whose side edge portion protrudes outward in the left-right direction from the position where the sealing material 57 is disposed. An outer fender 66 is attached to the flange extension 65 by a fender bolt 67. The outer fender 66 includes an upper edge flange portion 66a that is fastened to the flange extension portion 65 of the case body 54 of the battery case 50, a connection portion 66b that is continuous with the upper edge flange portion 66a and is bent downward, and a horizontal direction from the connection portion 66b. It is composed of a fender body 66c that projects outward and forms an arc in the front-rear direction.
The battery case 50 can be cooled by flowing the wind generated when the vehicle travels and the airflow generated by the rotation of the rear wheels 8R and 8L along the side wall 62 and the outer fender 66 of the case body 54 functioning as the inner fender 63.

  As shown in FIGS. 8 and 9, the rear wall 79 of the case main body 54 of the battery case 50 is provided with a wall portion 82 that separates the connector housing portion 81 in order to house the charging connector 80. . A concave portion 83 is formed in the wall portion 82. A lid 84 supported at the upper end is attached to the recess 83 so as to be openable and closable. When the lid 84 is closed, the wall portion 82 becomes a continuous surface.

  A charging connector 80 for inserting a charging plug of external equipment is disposed on the bottom wall 85 of the recess 83. The charging connector 80 is fixed to the bottom wall 85 via a waterproof and dustproof seal rubber 86. The periphery of the charging connector 80 is covered with a peripheral wall 87 of the seal rubber 86. A harness 88 extending from the charging connector 80 passes through a grommet 89 provided on the rear wall 79 of the case body 54 and extends into the case body 54.

  The lid 84 is provided with a lock key 90. The bottom wall 85 of the recess 83 is provided with a lock hole 93 with which the locking portion 92 of the lock key 90 is engaged when the lid 84 is closed and the lock key 90 is rotated by the key 91.

  As shown in FIGS. 3 and 4, a voltage is supplied to 12V auxiliary equipment and a control device at a connecting portion between the lower frame 5b and the rear frame 5r of the vehicle body frame 5 and in the center in the vehicle width direction. An auxiliary battery 77 is attached by bolts. A DC-DC converter (DC-DC) 94 that steps down the voltage of the battery 51 and charges the auxiliary battery 77 is attached to the upper outer surface of the front wall 64 of the front wall 64 of the battery case 50 by a bolt. The DC-DC converter includes a vertical fin 95 for heat dissipation on the front surface.

Here, a duct connection hole 76 ′ is formed in the case main body 54 of the battery case 50 on the left side of the joint shaft 19 (see FIG. 4) below the front wall 64 of the bulging portion 60. Similarly, a duct connection hole 76 is formed in the lower portion of the front wall 68 of the motor case 33. These two duct connection holes 76, 76 ′ are formed when the bulging portion 60 of the case body 54 of the battery case 50 is inserted into the housing recess 44 of the motor case 33 and the motor case 33 and the battery case 50 are assembled. As seen from the outside of the motor case 33, they are matched with each other. The proximal end of a cylindrical and flexible bellows-like cooling duct 70 is connected to these duct connection holes 76 and 76 '. At the base end of the cooling duct 70, seal ring portions 70s that are in close contact with the case body 54 of the motor case 33 and the battery case 50 are formed.
The cooling duct 70 supplies cooling air to the inside of the battery case 50 by discharging the internal air from the discharge duct 72 by the cooling fan 71.

  The front end side of the cooling duct 70 extends forward along the joint shaft 19 in a state of being close to the joint shaft 19, further extends forward across the swing axis S of the link 16, and the front end portion is in the floor 3. It is open at.

  Inside the battery case 50, a plate-like bracket 74 is provided on the inner upper portion of the front wall 64 along the front wall 64 and straddling the side wall 62. A contactor (CON) 96 for turning on and off the drive circuit of the motor 32 is provided at the upper portion of the center portion in the vehicle width direction of the bracket 74, and a battery managing unit (BMU) for charge / discharge control of the battery 51 below the contactor 96 ) 97 is attached by bolts. A control unit 100 is attached to the center of the front wall 68 of the motor case 33 located on the front side of the battery case 50 with a bolt.

  In the control unit 100, a power drive unit (PDU) 98 that is a switching unit (driver) that drives the motor 32, and a battery managing unit 97 and an ECU 99 that controls the power drive unit 98 are integrally connected. The ECU 99 receives an accelerator opening signal of an accelerator grip provided on the handle 15 and controls the battery managing unit 97 and the power drive unit 98 based on the accelerator opening signal. The ECU 99 accepts not only the accelerator opening signal but also signals from various sensors and outputs control signals for various auxiliary machines.

Therefore, as shown in FIG. 10, the electric power from the battery 51 is supplied to the power drive unit 98 via the contactor 96 interlocked with the main switch (not shown), and after being converted from direct current to three-phase alternating current by the power drive unit 98. It is supplied to a motor 32 that is a three-phase AC motor. The output voltage from the battery 51 is stepped down via the DC-DC converter 94 and supplied to the auxiliary battery 77.
The battery managing unit 97 monitors the charge / discharge status, temperature, and the like of the battery 51, and the information is shared with the ECU 99. In addition to the accelerator opening signal, signal information from various sensors is input to the ECU 99, and the ECU 99 drives and controls the motor 32 via the power drive unit 98 based on these information. Electric power is supplied to the battery 51 from an external power supply device via the charging connector 80.

  According to the above embodiment, when the cooling fan 71 of the discharge duct 72 is driven, the outside air is sucked from the front end opening of the cooling duct 70, and the sucked outside air passes through the inside of the cooling duct 70 and is located in the battery case 50. The battery case 50 is supplied from the proximal end opening. The supplied cooling air cools the lower battery 53, cools the contactor 96 and the battery managing unit 97, cools the upper battery 52, and is discharged backward from the discharge duct 72 via the cooling fan 71.

  Although the cooling duct 70 is routed from the power unit 9 side to the vehicle body front side, the base end is connected to the duct connection holes 76 and 76 ′ of the motor case 33 and the battery case 50, and along the joint shaft 19, 19 is extended forward in the state close to 19. Therefore, even if the power unit 9 swings in the left-right direction around the axis R of the joint shaft 19 with respect to the vehicle body frame 5 (joint case 18), the cooling duct 70 is connected to the joint case 18 when the joint shaft 19 rolls. The displacement of the joint shaft 19 around the axis R (rolling direction) with respect to is minimized. Therefore, it is possible to prevent the cooling duct 70 from being twisted and to be buffered with peripheral parts. Further, it is not necessary to form a path for air to flow in the battery case 50, and the battery 51 can be cooled with a configuration in which the discharge duct 72 including the cooling fan 71 is provided on the lid 58 of the battery case 50. .

  Further, the cooling duct 70 extending forward across the swing axis S does not change on the tip side even with respect to the swing operation of the power unit 9, and only slightly curves near the swing axis S. Further, even if the front end side of the cooling duct 70 is fixed, it is possible to absorb the twist as a whole with respect to the swing operation and the rolling operation of the power unit 9, and it is possible to prevent a load from being applied due to the local twist.

Next, a second embodiment of the present invention will be described with reference to FIGS.
The cooling duct 70 </ b> A of this embodiment is formed in a bellows shape with an attachment position and attachment manner on the base end side and a flexible material, in a state close to the joint shaft 19 along the joint shaft 19. The point extended to the front side is the same as in the first embodiment. Here, the front end side of the cooling duct 70 </ b> A of this embodiment is routed along the rear cushion 21. Specifically, the clamper 101 is attached to the lower portion of the rear cushion 21 so as to sandwich the rear cushion 21 in the radial direction, and a cylindrical holding portion 102 is formed at the rear portion of the clamper 101, and a cooling duct 70A is formed in the holding portion 102. Is inserted from below. The upper end portion of the cooling duct 70A is inserted between the guide portions 104 of the resin-made hold bracket 103 attached to the lower portion of the rear frame 5r of the vehicle body frame 5.
As shown in FIG. 12, the holding bracket 103 has upper and lower end portions fixed to both side portions of the rear frame 5r by mounting bolts 105, and a guide portion 104 is formed downward along the vehicle width direction. The lateral displacement of the cooling duct 70A is restricted by the guide portion.

According to this embodiment, similar to the first embodiment, the cooling duct 70 </ b> A is connected to the duct connection holes 76, 76 ′ of the motor case 33 and the battery case 50, and the joint shaft 19 extends along the joint shaft 19. It is extended forward in the state close to. Therefore, with respect to the movement of the power unit 9 that swings in the left-right direction about the axis R of the joint shaft 19 with respect to the vehicle body frame 5, the cooling duct 70 </ b> A has the axis of the joint shaft 19 in the portion along the joint shaft 19. Displacement around R (rolling direction) is minimized. Therefore, it is possible to prevent the cooling duct 70A from being twisted and buffering with peripheral components.
In particular, in this embodiment, the cooling duct 70 </ b> A extending upward along the rear cushion 21 can suck cooling air from above, and the guide portion 104 is surrounded by an opening, so that water enters. This is advantageous in terms of prevention.
Furthermore, since the cooling duct 70A is merely inserted through the holding portion 102 of the clamper 101, the wiring work is simple and the cooling duct 70A can be held with a simple structure.

Next, a third embodiment of the present invention will be described with reference to FIGS.
The cooling duct 70 </ b> B of this embodiment is close to the joint shaft 19 along the joint shaft 19, the attachment position and the attachment manner on the base end side, the point being formed in a bellows shape with a flexible material, The point extended to the front side in the state is the same as in the first embodiment. Here, the cooling duct 70B of this embodiment is routed by making effective use of the U-shaped cushion bracket 106 that supports the lower end of the rear cushion 21 to the rear frame 5r. Specifically, the cooling duct 70 </ b> B is inserted through the space portion of the U-shaped cushion bracket 106.
The upper end portion of the cooling duct 70B is inserted into the guide portion 104B of the resin-made hold bracket 103B attached to the upper portion of the rear frame 5r of the vehicle body frame 5 below the seat 10.

  According to this embodiment, in addition to the effects of the second embodiment, since the cushion bracket 106 which is an existing part is used, a new part is not necessary, and the number of parts for wiring can be reduced. In particular, the hold bracket 103B has an advantage that it cannot be seen from the outside because it is housed in the space under the seat 10.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
In this embodiment, a part of the cooling duct 70 </ b> C is formed inside the joint shaft 19 and the joint case 18 constituting the swing joint 17. That is, the cooling duct 70 </ b> C is formed along the joint shaft 19 so as to coincide with the joint shaft 19.

Here, the joint case 18 is an upper and lower halved member mainly composed of two parts, but for simplification of description, the joint case 18 is simply shown as a cross section along the vertical direction.
The joint shaft 19 is formed in a cylindrical shape, and a small-diameter portion 108 is formed at a tip portion via a step portion 107. A rear duct 109 is connected to the proximal end portion of the joint shaft 19 with a band 110. The rear duct 109 includes seal ring portions 70 s and 70 s similar to the base of the cooling duct 70 of the first embodiment on the base end side (not shown), and is connected to the duct connection holes 76 and 76 ′ of the motor case 33 and the battery case 50. The battery case 50 communicates with the inside.

  Further, four cams 111 are provided around the small diameter portion 108 at the distal end portion of the joint shaft 19. A nut 113 is provided at the tip of the joint shaft 19 to prevent the joint shaft 19 from coming off from the joint case 18. A knight hull rubber 112 is provided between the joint case 18 and the cam 111 of the joint shaft 19, and the cam 111 is supported by the knight hull rubber 112 of the joint case 18. When the vehicle body tilts, each cam 111 presses the corresponding night hull rubber 112 to allow the vehicle body to tilt, and generates a reaction force in the returning direction of the tilted vehicle body. The joint case 18 is provided with a space 114 that accommodates the front end opening of the joint shaft 19, and a connection port 116 of the front duct 115 is formed in the space 114.

  The base end of the front duct 115 is attached to the connection port 116 by a band 110. The front opening of the front duct 115 opens in the floor 3. That is, the cooling duct 70 </ b> C of this embodiment includes the rear duct 109, the inside of the joint shaft 19, the space 114 of the joint case 18, and the front duct 115. In addition, since the front duct 115 and the rear duct 109 are formed in a bellows shape with a flexible material, it can be said that the cooling duct 70C is formed with a flexible material as a whole.

According to this embodiment, since the rolling joint shaft 19 itself constitutes a part of the cooling duct 70C, the rear duct 109, which is a connection portion with the battery case 50 that is not twisted relative to the joint shaft 19, is provided. Since the joint case 18 that supports the joint shaft 19 without being twisted is not twisted relative to the vehicle body frame 5, it is a connecting portion between the vehicle body frame 5 side and the joint case 18 that supports the joint shaft 19. The front duct 115 is not twisted.
Therefore, there is no portion twisted over the entire cooling duct 70C, and the durability is remarkably improved.

The present invention is not limited to the above-described embodiment. For example, a vehicle in which the loading platform 11 is supported behind the connecting portion of the joint shaft 19 and the loading platform 11 does not swing even if the seat 10 swings. It can also be applied to. The battery is not limited to a lithium ion battery, and a rechargeable secondary battery such as a nickel metal hydride battery or a lead battery can be used.
Furthermore, although the case where the charging connector 80 is provided and charging is performed by an external commercial charging device has been described, a form of charging by a household power source can be adopted. In this case, as shown by a chain line in FIG. 1, the plug P for 100V may be accommodated together with the cord in the connector accommodating portion 81, and the seat back 10b of the seat 10 is tilted forward, A 100V plug P and cord may be stored on the back side. In addition, when using the plug P for 100V, an inverter is provided inside the battery case 50.

5 Body frame 9 Power unit 17 Swing joint S Swing shaft 18 Joint case 19 Joint shaft 51 Battery 8R, 8L Rear wheel (drive wheel)
32 Motor 21 Reaction 50 Battery case 70, 70A, 70B, 70C Cooling duct 101 Clamper 106 Cushion bracket

Claims (6)

  A power unit (9) for generating a vehicle driving force is provided at the rear of the vehicle body frame (5) via a swing joint (17), and the swing joint (17) is connected to the vehicle body frame (5) with a swing shaft ( A joint case (18) supported so as to be movable up and down via S), and a joint shaft (19) supported so as to be swingable in the left-right direction with respect to the joint case (18). 9) is supported by the joint shaft (19), and the power unit (9) uses a battery (51) as a travel drive source and the drive wheels (8R, 8L) by electric power supplied from the battery (51). A driving motor (32) for driving, and a pair of left and right drive wheels (8R, 8L) are connected to the power unit (9). A battery case (50) between the rear portion of the vehicle body frame (5) and the power unit (9) and having a rear cushion (21) interposed at the center in the vehicle width direction and housing the battery (51). ), And a flexible cooling duct (70) for supplying cooling air into the battery case (50) is connected to the battery case (50), and the cooling duct (70) is connected to the joint shaft. A cooling duct routing structure for a saddle-ride type electric vehicle, wherein the cooling duct is extended forward along (19) in a state of being close to the joint shaft (19).   The cooling duct routing structure for a saddle-ride type electric vehicle according to claim 1, wherein the cooling duct (70) extends forward across the swing axis (S).   The cooling duct routing structure for a saddle-ride type electric vehicle according to claim 1, wherein the cooling duct (70A) extends upward along the rear cushion (21).   4. A cooling duct arrangement for a saddle-ride type electric vehicle according to claim 3, wherein a clamper (101) is provided behind the rear cushion (21), and a cooling duct (70A) is held by the clamper (101). Cable structure.   The saddle riding according to claim 1, wherein the rear cushion (21) includes a U-shaped cushion bracket (106) at a lower end, and a cooling duct (70B) is inserted into the cushion bracket (106). Cooling duct routing structure for type electric vehicles.   The cooling duct routing structure for a saddle-ride type electric vehicle according to claim 1, wherein a cooling duct (70C) is formed inside the swing joint (17).

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