阅读说明：本技术 跨骑型电动三轮车 (Straddle type electric tricycle ) 是由 池长俊宏 筒井正行 岩崎谦二郎 山本伸吾 内山一 中西孝文 于 2021-03-12 设计创作，主要内容包括：本发明提供通过提高后侧车身的刚性,能够提高缓冲性及操纵稳定性的电动三轮车。该跨骑型电动三轮车包含：前侧车身(BF)、后侧车身(BR)、动力单元(U)、摆动装置(50),其中,所述后侧车身(BR)包含：摆臂(16),其支承所述动力单元(U)；后缓冲器(88),其将该摆臂(16)悬挂于所述后侧车身(BR)。所述动力单元(U)通过前侧固定部(200)及左右一对后侧固定部(201)固定于所述摆臂(16),所述后缓冲器(88)的下端部在比所述后侧固定部(201)靠后方的位置,支承于所述摆臂(16)的后端部件(107)。所述后端部件(107)形成向上方敞开的大致U字状截面。(The invention provides an electric tricycle which can improve the buffer property and the operation stability by improving the rigidity of a rear side body. The straddle type electric tricycle includes: front side automobile Body (BF), rear side automobile Body (BR), power unit (U), pendulous device (50), wherein, rear side automobile Body (BR) includes: a swing arm (16) that supports the power unit (U); and a rear cushion (88) that suspends the swing arm (16) from the rear side vehicle Body (BR). The power unit (U) is fixed to the swing arm (16) by a front fixing section (200) and a pair of right and left rear fixing sections (201), and the lower end of the rear shock absorber (88) is supported by the rear end section (107) of the swing arm (16) at a position rearward of the rear fixing sections (201). The rear end member (107) has a substantially U-shaped cross section that opens upward.)

1. A straddle-type electric tricycle, comprising:

a front side vehicle Body (BF) which supports a single front Wheel (WF); a rear side Body (BR) that supports a pair of left and right rear Wheels (WR); a power unit (U) that drives the rear Wheel (WR); a swing device (50) that is attached to a lower portion of the front side vehicle Body (BF) and that supports the rear side vehicle Body (BR) so as to be able to swing in a roll direction, the straddle-type electric tricycle being characterized in that,

the rear side Body (BR) includes: a swing arm (16) that supports the power unit (U); a rear cushion (88) suspending the swing arm (16) from the rear vehicle Body (BR),

the power unit (U) is fixed on the swing arm (16) through a front fixing part (200) and a pair of left and right rear fixing parts (201),

the lower end of the rear cushion (88) is supported by the rear end part (107) of the swing arm (16) at a position rearward of the rear fixing part (201),

the rear end member (107) has a substantially U-shaped cross section that opens upward.

2. The straddle-type electric tricycle of claim 1,

the lower edge part (120a) of the power unit (U) and the arm part (103) overlap each other when viewed from the side of the vehicle body.

3. The straddle-type electric tricycle according to claim 1 or 2,

the swing arm (16) has a pair of left and right arm portions (103) extending in the front-rear direction of the vehicle and a cross portion (C) connecting the pair of left and right arm portions (103) to each other,

the cross section (C) is composed of an upper plate member (110) and a lower plate member (111),

a joint (105) where the upper plate member (110) and the lower plate member (111) are in contact is provided substantially at the center of the cross section (C).

4. The straddle-type electric tricycle of claim 3,

the front end edge or the rear end edge of the cross section (C) is a curved section (106) that curves in the vehicle longitudinal direction when the vehicle body is viewed in plan.

5. The straddle-type electric tricycle according to claim 3 or 4,

the engaging portion (105) constitutes a recess lower than an upper edge portion of the arm portion (103),

the power unit (U) is disposed directly above the joint (105).

6. The straddle-type electric tricycle of claim 5,

the front end edge part (105b) of the joint part (105) is formed into an arc shape.

7. The straddle-type electric tricycle of claim 5,

the bottom part (105a) of the joint part (105) extends linearly toward the rear when viewed from the side of the vehicle body.

8. The straddle-type electric tricycle according to any one of claims 1 to 7,

the rear side vehicle Body (BR) has: a pair of left and right main frames (71) extending rearward and upward from the pivot shaft (24) of the swing arm (16), and then bent at a bent portion (71a) and extending rearward; and a lateral frame (80) that connects the pair of left and right main frames (71) to each other at a position directly behind the bent portion (71 a).

9. The straddle-type electric tricycle of claim 8,

has a PCU (64) mounted on the rear side vehicle Body (BR),

the PCU (64) is supported by a PCU fixing frame (78), and the PCU fixing frame (78) extends from the pair of left and right main frames (71) to the inner side in the vehicle width direction to a position where the PCU fixing frame and the main frames do not contact each other.

Technical Field

The present invention relates to a saddle-ride type electric tricycle, and more particularly, to a saddle-ride type electric tricycle having a front vehicle body supporting a single front wheel and a rear vehicle body configured to support a pair of right and left rear wheels and to be swingable in a roll axis direction with respect to the front vehicle body.

Background

Conventionally, a straddle-type electric tricycle is known which has a front side vehicle body supporting a single front wheel and a rear side vehicle body configured to support a pair of right and left rear wheels and to be swingable in a roll axis direction with respect to the front side vehicle body.

Patent document 1 discloses a saddle-ride type electric tricycle including a motor unit and a swing arm on a rear side vehicle body, and a rear end portion of the swing arm is suspended by a rear cushion.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-43722

Disclosure of Invention

Problems to be solved by the invention

In the saddle-ride type electric tricycle having the vehicle body structure as in patent document 1, a torsional force is easily applied to the rear side frame by an input from the left and right rear wheels, and it is necessary to conduct a study to improve the rigidity of the rear side vehicle body. In particular, in patent document 1, in order to improve the cushioning performance, the rear cushion is supported at the rear end of the swing arm, and a torsional force is easily applied to the rear side frame.

An object of the present invention is to solve the above-described problems of the prior art and to provide a saddle-ride type electric tricycle capable of improving the shock absorption and the steering stability by improving the rigidity of the rear side body.

Means for solving the problems

In order to achieve the object, the present invention provides a saddle-ride type electric tricycle, including: a front side vehicle Body (BF) which supports a single front Wheel (WF); a rear side Body (BR) that supports a pair of left and right rear Wheels (WR); a power unit (U) that drives the rear Wheel (WR); a swing device (50) that is attached to a lower portion of the front side Body (BF) and that supports the rear side Body (BR) so as to be swingable in a roll direction, the straddle-type electric tricycle being characterized in that the rear side Body (BR) includes: a swing arm (16) that supports the power unit (U); and a rear cushion (88) that suspends the swing arm (16) from the rear vehicle Body (BR), wherein the power unit (U) is fixed to the swing arm (16) by a front fixing section (200) and a pair of right and left rear fixing sections (201), wherein the lower end section of the rear cushion (88) is supported by a rear end section (107) of the swing arm (16) at a position rearward of the rear fixing sections (201), and wherein the rear end section (107) has a substantially U-shaped cross section that opens upward.

In addition, according to a second aspect of the present invention, the lower edge portion (120a) of the power unit (U) and the arm portion (103) overlap each other when viewed from the side of the vehicle body.

In addition, according to a third aspect of the present invention, the swing arm (16) includes a pair of left and right arm portions (103) extending in the front-rear direction of the vehicle, and a cross portion (C) connecting the pair of left and right arm portions (103) to each other, the cross portion (C) is configured by an upper plate member (110) and a lower plate member (111), and a joint portion (105) where the upper plate member (110) and the lower plate member (111) are in contact with each other is provided substantially at the center of the cross portion (C).

Further, according to a fourth aspect of the present invention, in a plan view of the vehicle body, a front end edge or a rear end edge of the spanning portion (C) is a curved portion (106) that curves in a vehicle front-rear direction.

In addition, according to a fifth aspect of the present invention, the joint (105) forms a recess lower than an upper edge of the arm (103), and the power unit (U) is disposed directly above the joint (105).

Further, according to a sixth aspect of the present invention, a tip edge portion (105b) of the joint portion (105) is formed in an arc shape.

In addition, according to a seventh aspect of the present invention, a bottom portion (105a) of the joint portion (105) extends linearly rearward in a vehicle body side view.

In addition, according to an eighth aspect of the present invention, the rear side vehicle Body (BR) includes: a pair of left and right main frames (71) extending rearward and upward from the pivot shaft (24) of the swing arm (16), and then bent at a bent portion (71a) and extending rearward; and a lateral frame (80) that connects the pair of left and right main frames (71) to each other at a position directly behind the curved portion (71 a).

Furthermore, according to a ninth aspect of the present invention, the vehicle further includes a PCU (64) mounted on the rear side vehicle Body (BR), the PCU (64) is supported by a PCU fixing frame (78), and the PCU fixing frame (78) extends from each of the pair of left and right main frames (71) toward the inside in the vehicle width direction to a position where the PCU does not contact each other.

Effects of the invention

According to a first feature, the straddle-type electric tricycle includes: a front side vehicle Body (BF) which supports a single front Wheel (WF); a rear side Body (BR) that supports a pair of left and right rear Wheels (WR); a power unit (U) that drives the rear Wheel (WR); a swing device (50) which is attached to a lower portion of the front side Body (BF) and which swingably supports the rear side Body (BR) in a roll direction, wherein the rear side Body (BR) includes: a swing arm (16) that supports the power unit (U); and a rear cushion (88) that suspends the swing arm (16) from the rear vehicle Body (BR), wherein the power unit (U) is fixed to the swing arm (16) by a front fixing section (200) and a pair of right and left rear fixing sections (201), wherein a lower end portion of the rear cushion (88) is supported by a rear end member (107) of the swing arm (16) at a position rearward of the rear fixing sections (201), and wherein the rear end member (107) has a substantially U-shaped cross section that opens upward. Further, by forming the rear end of the swing arm in a shape that opens upward, a twisting force caused by an external force input from the left and right rear wheels can be released, and a load applied to the rear vehicle body can be suppressed.

According to the second feature, the lower edge portion (120a) of the power unit (U) and the arm portion (103) overlap each other when viewed from the side of the vehicle body, so that the power unit can be stably arranged with respect to the swing arm, and the vertical height when the power unit is arranged can be suppressed. As a result, the height of the carrier provided on the rear vehicle body can be reduced, and the convenience can be improved.

According to the third aspect, the swing arm (16) has a pair of left and right arm portions (103) extending in the front-rear direction of the vehicle and a cross portion (C) connecting the pair of left and right arm portions (103) to each other, the cross portion (C) is formed by an upper plate member (110) and a lower plate member (111), and a joint portion (105) where the upper plate member (110) and the lower plate member (111) are in contact with each other is provided substantially at the center of the cross portion (C), so that the rigidity of the swing arm can be improved by the cross portion having the joint portion, and even when the upper plate member (110) and the lower plate member (111) vibrate due to the vibration of the vehicle body, the generation of the echo of the vibration sound in the space formed by the upper plate member (110) and the lower plate member (111) can be suppressed.

According to the fourth feature, since the front end edge or the rear end edge of the cross portion (C) is a bent portion (106) that is bent in the vehicle longitudinal direction in a plan view of the vehicle body, for example, a twisting stress can be dispersed by the bent portion disposed on the vehicle body rear side of the cross portion.

According to the fifth feature, the joint (105) forms a recess lower than the upper edge of the arm (103), and the power unit (U) is disposed directly above the joint (105), so that the power unit can be stably disposed with respect to the swing arm.

According to the sixth feature, since the leading edge portion (105b) of the joint portion (105) has an arc shape, twisting stress is easily dispersed by the leading edge portion of the joint portion.

According to the seventh feature, since the bottom portion (105a) of the joint portion (105) extends linearly toward the rear in a vehicle body side view, water can be discharged rearward from the joint portion, and water retention in the joint portion can be prevented.

According to an eighth feature, the rear Body (BR) has: a pair of left and right main frames (71) extending rearward and upward from the pivot shaft (24) of the swing arm (16), and then bent at a bent portion (71a) and extending rearward; and a lateral frame (80) that connects the pair of left and right main frames (71) to each other at a position directly behind the curved portion (71a), so that the lateral frame connects the left and right main frames, thereby improving the rigidity of the rear vehicle body.

According to the ninth feature, since the vehicle has the PCU (64) mounted on the rear side vehicle Body (BR), and the PCU (64) is supported by the PCU fixing frames (78) extending from the pair of left and right main frames (71) toward the vehicle width direction inner sides, respectively, to positions where the PCU fixing frames do not contact each other, the left and right PCU fixing frames are not connected to each other, and thus the propagation of the twist transmitted to the rear side vehicle body frame to the PCU can be suppressed.

Drawings

Fig. 1 is a perspective view of the saddle-ride type electric tricycle according to the embodiment.

Fig. 2 is a left side view of the straddle-type electric tricycle.

Fig. 3 is a left side view of the saddle-ride type electric tricycle with the exterior parts removed from the state of fig. 2.

Fig. 4 is a perspective view of a vehicle body frame constituting a front side vehicle body.

Fig. 5 is a left side view of the rear vehicle body.

Fig. 6 is a perspective view of the rear vehicle body.

Fig. 7 is a perspective view of the rear vehicle body with the exterior component removed.

Fig. 8 is a partially sectional perspective view of the rear vehicle body.

Fig. 9 is a perspective view of the rear side frame.

Fig. 10 is a perspective view of the swing arm.

Fig. 11 is a top view of the swing arm.

Fig. 12 is a bottom view of the swing arm.

Fig. 13 is a left side view of the rear vehicle body.

Fig. 14 is a plan view of the rear wheel body.

Fig. 15 is a sectional view of the power unit and the swing arm.

Fig. 16 is a perspective view of the power unit.

Fig. 17 is a perspective view of a left side case and a right side case constituting the power unit.

Fig. 18 is a left side view of the power unit.

Fig. 19 is a side view of the three-phase wire harness and the control wire as viewed from the right side in the vehicle width direction.

Fig. 20 is a perspective view of the large-diameter grommet and the small-diameter grommet fixed by the second strap.

Description of the reference numerals

1 … saddled electric tricycle, 16 … swing arm, 24 … pivot, 64 … PCU, 71a … curved portion, 71 … main frame, 78 … PCU fixing frame, 80 … horizontal frame, 89 … three-phase wire harness (high voltage wire), 50 … swing device, 88 … rear buffer, 103 … arm portion, 107 … rear end member, 105 … joint portion, 106 … curved portion, front end edge portion of 105B … joint portion, bottom portion of 105a … joint portion, 110 … upper side plate member, 111 … lower side plate member, 120 … left side housing, 121 … right side housing, lower edge portion of 120a … power unit, 130 … opening portion, 131 … lower side support portion (support portion), 132 … upper side support portion (vertical line), 140a, 142a … wire clip, 200 … front side fixing portion, 201 … rear side fixing portion, B … battery, C … crossing portion, M … motor, V …, V … front wheel …, WR … front wheel 39 … front wheel, WF front wheel 3926 front wheel, WF rear wheel 3926 front side fixing portion, BR … rear side car body, U … power unit

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a perspective view of a saddle-ride type electric tricycle 1 according to the present embodiment. Fig. 2 is a left side view of the saddle-type electric tricycle 1, and fig. 3 is a left side view of the saddle-type electric tricycle 1 with exterior parts removed from the state of fig. 2.

The saddle-ride type electric tricycle 1 is a scooter type electric vehicle in which a front side body BF supporting one front wheel WF and a rear side body BR supporting two rear wheels WR are pivotally supported by a swing device 50 so as to be swingable in a roll direction. A high-voltage battery (main battery) B that supplies electric power to the motor M that drives the rear wheels WR is housed in a row in the vehicle width direction below the seat 22 provided on the front vehicle body BF. By pulling out the two batteries B upward with the openable seat 22 opened, the two batteries B can be detached from the vehicle body. A low floor pan 12 for putting a driver's feet is provided between the steering handle 2 and the seat 22.

The frame F constituting the front side body BF includes: a head pipe F2 that pivotally supports a steering column F1 to which the steering handle 2 is fixed; a lower frame F3 extending rearward and downward from the head pipe F2; a pair of left and right bent frames F6 connected to both side surfaces of the lower frame F3, extending downward and bent rearward; a pair of left and right floor frames F4 connected to the bent frame F6 and extending rearward.

A pair of left and right rearview mirrors 3 and a meter device 4 are attached to the steering handle 2. A bottom bridge F5 is fixed to a lower end portion of a steering column F1 that supports the steering handle 2, and a pair of left and right front forks 9 that pivotally support the front wheel WF are fixed to the bottom bridge F5.

A swing device 50 that swingably supports the front vehicle body BF and the rear vehicle body BR is fixed to a lower portion of the floor frame F4 at a position below the battery B. A pair of right and left swing arms 16 pivotally supported by a pivot shaft 24 are provided on a rear vehicle body BR having a large article carrier 19, and a power unit U for supporting a rear wheel WR is attached to a rear portion of the swing arms 16.

The front of the head pipe F2 is covered by the center cowl 5 connected to the pair of left and right side cowls 10, and the leg shield 11 is disposed behind the head pipe F2. A front side turn signal flasher 6 is attached to the right and left of the extension portion supporting the headlight 7, and a front fender 8 covering the upper side of the front wheel WF is supported by a bottom bridge F5.

Lower cowlings 13 covering the sides and lower portions of the floor frame F4 are connected to the left and right end portions of the low floor pan 12. A seat lower cowl 14 covering the battery case 29 from the front and a rear cover 15 connected to the rear of the seat lower cowl 14 are disposed below the seat 22.

As shown in fig. 3, a junction box J as a wiring terminal is disposed at a position inside the rear cover 15 behind the battery B. The battery B and the junction box J constitute a power supply device for supplying electric power to the motor M. On the other hand, a control device (PCU: power supply control unit) 64 for transmitting the electric power supplied from the power supply device B, J to the motor M is disposed at the front end portion of the rear side vehicle body BR. A battery lower cover 30, which is a cover member for covering a connection portion for connecting a battery-side terminal and a vehicle-body-side terminal, is disposed at a lower end portion of the battery B.

A stopper 18 having a thin tube shape for preventing the displacement of the load is provided on a rack 19 of the rear side body BR. A carrier 19 made of thin-plate-like synthetic resin or the like is disposed at an upper portion of the rear side frame 70, and a rear fender 17 covering an upper portion of the rear wheel WR is fixed to a lower portion of the rear side frame 70. The carrier 19 is supported by a carrier frame 32 made of a metal circular tube fixed to the rear frame 70. A rack frame cover 20 that covers a portion that is formed in an arch shape and stands on the rack frame 32 is disposed at the front end of the rack 19.

A left electrical component cover 25 is attached to the front of the rear fender 17 on the left side of the vehicle body. A tail lamp 27, a pair of right and left rear turn signal flashers 28, and a license plate holder 26 are fixed to the rear end portion of a rear side frame 70 mainly made of a metal square pipe material.

Fig. 4 is a perspective view of the frame F constituting the front side vehicle body BF. A vehicle frame F mainly composed of a metal circular tube material includes: a lower frame F3 extending rearward and downward from the head pipe F2; a pair of left and right bent frames F6 connected to both side surfaces of the lower frame F3, extending downward and bent rearward; a pair of left and right floor frames F4 connected to the bent frame F6 and extending rearward. The lower frame F3 at the center in the vehicle width direction is bent rearward at the lower end portion and is connected to a gusset F7 fixed to the pair of left and right floor frames F4.

A long low-floor support stay 33 for supporting the low-floor panel 12 is provided above the floor frame F4 at a position rearward of the gusset panel F7. A front battery case support stay 34 and a rear battery case support stay 37 for supporting the battery case 29 from below are attached to the left and right pairs behind the low floor bottom support stay 33.

Fig. 5 is a left side view of the rear side vehicle body BR. In the figure, the state in which the front vehicle body BF is removed in the state in which the swing device 50 is fixed to the rear vehicle body BR is shown. Through holes 51a through which bolts are passed are formed in front side support portions 51L and 51R of swing device 50. Further, a through hole 55a through which a bolt passes is formed in the rear support portion 55 of the swing device 50.

In the present embodiment, the electric power of battery B is temporarily sent to junction box J, which is a wiring terminal, and is sent to rear body BR through high-voltage harnesses H1, H2 extending from junction box J. The high-voltage harnesses H1 and H2 extending downward and forward from the junction box J are bent in a U-turn at a bent portion C located forward of the front side support portions 51L and 51R, and then wired rearward on the right side of the swing device 50.

The carrier 19 has a shape having an upright portion 19b that is upwardly erected at the front end of a flat plate portion 19a on which the load is placed. The carrier frame cover 20 covers both the arch portion of the carrier frame 32 and the standing portion 19b of the carrier 19.

Fig. 6 is a perspective view of the rear side vehicle body BR. The controller 64 for controlling the electric power supplied to the motor M is disposed such that a plurality of fins are exposed to the front of the vehicle body at positions below the carrier frame cover 20. The left electrical component cover 25 and the right electrical component cover 63 are disposed on the left and right of the control device 64.

Fig. 7 is a perspective view of a rear side vehicle body BR with an exterior component removed, and fig. 8 is a partially sectional perspective view of the rear side vehicle body BR. The rear side frame 70 is configured by connecting a pair of left and right main frames 71, which are mainly made of metal square tubes, by a plurality of cross tubes or the like directed in the vehicle width direction. The pivot shaft 24 of the swing arm 16 passes through the front end portion of the main frame 71 bent to the tip end of the front lower side. A cylindrical collar 100 through which the pivot shaft 24 passes is attached to the front end of the swing arm 16. A first cross pipe 72 connecting the left and right main frames 71 is disposed above the pivot shaft 24. A cylindrical collar 73 through which the pivot shaft 24 passes is supported to the first cross tube 72. A pair of left and right fixing plates 75 for fixing the swing shaft 60 by the fastening member 62 are attached to the lower portion of the first cross pipe 72.

A high-voltage harness H1 extending from the junction box J is connected to the left side portion of the control device 64. The connection portion is covered by the left electrical component cover 25. The power supply to the power unit U is performed by a three-phase harness 89 as a high-voltage harness extending from a wiring connector 64a provided at an upper portion of the control device 64. A high-voltage harness H2 extending from the junction box J is connected to a step-down regulator 86 disposed behind the control device 64.

The rack frame 32 made of a circular tube material includes: a substantially square outer frame portion 32b supporting the outer edge of the luggage carrier 19, an upright portion 32a erected in an arch shape from a position near the front of the outer frame portion 32b, a left and right connecting portion 32c connecting the left and right upright portions 32a in the vehicle width direction, and a left and right pair of upper and lower connecting portions 32d connecting the left and right connecting portion 32c and the outer frame portion 32 b. Inside the right electrical component cover 63, electrical components such as a low-voltage backup battery and a fuse box are disposed.

Fig. 9 is a perspective view of the rear side frame 70. The rear side frame 70 has a structure in which a main frame 71 formed of a pair of right and left square pipes is connected by a plurality of cross pipes or the like. A through hole 74 through which the pivot shaft 24 passes is formed in a front lower end portion of the main frame 71. A first cross pipe 72 that connects the left and right main frames 71 is provided above the through hole 74, and a cylindrical collar 73 is fixed below the first cross pipe 72. A pair of left and right fixing plates 75 provided with through holes 76 for fixing the swing shaft 60 are fixed below the first cross pipe 72.

The main frame 71 extends rearward and upward, and then bends at a bent portion 71a to extend rearward. A PCU fixing frame 78 extending inward in the vehicle width direction from the left and right inner wall surfaces of the main frame 71 is attached to a front lower portion of the bent portion 71 a. The PCU64 is supported by a PCU support plate 77 supported by the first cross pipe 72 and the PCU fixing frame 78. By separating the left and right PCU fixing frames 78 from each other, the twist applied to the main frame 71 can be prevented from being transmitted to the PCU 64. A down regulator support plate 81 for supporting the down regulator 86 is attached to an inner wall portion of the main frame 71 on the right side in the vehicle width direction behind the curved portion 71 a.

A second cross pipe 80 of a square pipe shape connecting the left and right main frames 71 to each other is provided above the down-regulator support plate 81. In order to ensure the swinging amount of the three-phase wire harness 89, the second cross tube 80 has a curved shape in which the vehicle width direction center is offset toward the rear. A third cross pipe 85 having a square pipe shape connecting the left and right main frames 71 to each other is provided at the rear end of the main frame 71. A rear cushion support portion 83 that supports an upper end portion of a rear cushion 88 (see fig. 13) is provided on a lower surface of the main frame 71 at a position between the second cross pipe 80 and the third cross pipe 85.

Fig. 10 is a perspective view of the swing arm 16. Fig. 11 is a plan view of the swing arm 16, and fig. 12 is a bottom view of the swing arm 16. The swing arm 16 made of metal such as aluminum or iron is mainly composed of a pair of left and right arm portions 103 extending in the front-rear direction and a cross portion C connecting the left and right arm portions 103. The arm 103 has a tip bent upward, and a cylindrical collar 100 through which the pivot shaft 24 passes is attached to the tip. A reinforcing gusset 101 is attached to the lower portion of the cylindrical collar 100.

The spanning portion C is composed of an upper plate member 110 and a lower plate member 111, and a joining portion 105, which forms a concave portion and joins the upper plate member 110 and the lower plate member 111 to each other, is provided at a central portion thereof. The front end edge 102 of the spanning portion C is linear in a plan view of the vehicle body, and the rear end edge 106 of the spanning portion C is curved in a plan view of the vehicle body. The stress of the torsion applied to the swing arm 16 can be dispersed by the curved shape of the rear end edge 106. Further, the front end edge portion 105b of the joint portion 105 is formed in an arc shape protruding forward, and in this shape, the torsional stress applied to the swing arm 16 can be dispersed.

A front side support portion 104 of the power unit U is provided on an upper surface of the vehicle width direction center near the front end edge 102. The front side support portion 104 may be disposed so as to be offset to either the left or the right. The rear end of the arm 103 is formed of a rear end member 107 having a substantially U-shaped cross section and opening upward. A through hole 108 for supporting a pair of left and right support portions of the power unit U is formed on the front side of the rear end member 107, and a through hole 109 for supporting the lower end portion of the rear cushion 88 is formed at the rear end portion of the rear end member 107. By forming the rear end of the swing arm 16 in a shape that opens upward in this way, a twisting force caused by an external force input from the left and right rear wheels WR can be released, and a load applied to the rear side vehicle body BR can be suppressed.

Fig. 13 is a left side view of the rear side vehicle body BR. Fig. 14 is a plan view of the rear wheel body BR. Fig. 13 shows a state where the left rear wheel WR is removed. The power unit U fixed to the upper portion of the swing arm 16 includes a front portion 90 that accommodates the center of the motor M in the vehicle width direction, and a pair of left and right rear portions 91 that extend outward in the vehicle width direction from a position offset rearward and downward from the center of the motor M. A front stay 200 provided at a lower portion of the front portion 90 is fixed to a front support 104 formed in the swing arm 16 by a fastening member 150.

The upper end of the rear cushion 88 is supported by the rear cushion support portion 83 via a bolt 83 a. On the other hand, the lower end portion of the rear cushion 88 is supported by the rear end portion of the rear end member 107 of the swing arm 16 via the bolt 16 a.

The high-voltage harness 89 is connected to the opening 130 of the power unit U. The high-voltage harness 89 is wired upward in a spiral manner. Thus, even if the swing arm 16 swings with respect to the rear wheel frame 70, the bending of the high-voltage harness 89 can be suppressed to be small. In order to ensure the amount of swing of the high-voltage wire harness 89, the second cross tube 80 is formed in a curved shape in which the vehicle width direction center portion protrudes rearward. The main frame 71 is configured such that the vehicle width direction interval is narrower at a portion supporting the rear cushion 88 than at the vehicle body front side supporting the PCU64 and the power unit U.

Fig. 15 is a sectional view of the power unit U and the swing arm 16. This figure shows a state in which the vehicle is cut at the center in the vehicle width direction and viewed from the left side. As described above, the front stay 200 of the power unit U is supported by the front support 104 of the swing arm 16 via the fastening member 150. A pair of left and right rear stays 201 are formed on the rear side of the power unit U, and are supported by the rear end member 107 of the swing arm 16 via a fastening member 151.

As described above, the joint 105 at which the upper plate member 110 and the lower plate member 111 contact each other is formed at the spanning portion C of the swing arm 16. The bottom portion 105a of the joint portion 105 extends linearly toward the vehicle rear side in a vehicle body side view, and therefore, water can be discharged rearward from the joint portion 105, and water is prevented from remaining on the upper surface of the joint portion 105. A recess 112 for forming the joint 105 is provided on the back surface side of the swing arm 16.

The bottom 120a of the power unit U and the bottom 105a of the joint 105 are disposed close to each other until they overlap the arm 103 of the swing arm 16 when viewed from the side of the vehicle body. This reduces the overall height of the rear vehicle body BR, and can suppress the position of the carrier rack 19 to a low level.

Fig. 16 is a perspective view of the power unit U. The front portion 90 and the rear portion 91 of the power unit U are formed by joining a left side case 120 and a right side case 121 at the center in the vehicle width direction. A brake shoe mounting portion of the drum brake is provided at an outer end portion of the power unit U in the vehicle width direction. An opening 130 is formed at the front end of the power unit U as an outlet for the three-phase harness 89. The opening 130 is provided in the left side case 120, and the front side stay 200 is provided in the right side case 121.

The U-phase, V-phase, and W-phase high-voltage lines 160 and the control lines 163 are inserted into the opening 130. The ground wire 161 tied with the three-phase wire harness 89 is fastened to the left side case 120 below the opening 130.

The three-phase harness 89 extending from the opening 130 is fixed to the left housing 120 by a first strap 140 and a second strap 142. The first band 140 directly clamps the three-phase harness 89 and the control wire 163, and the second band 142 clamps the three-phase harness 89 and the control wire 163 via a cylindrical grommet made of rubber. Further above the second strap 142, the three-phase harness 89 and the control wire 163 are fixed to a stay supported by the wiring connector 64a of the PCU64 by a third strap 143.

Fig. 17 is a perspective view of the left side case 120 and the right side case 121 constituting the power unit U. In addition, fig. 18 is a left side view of the power unit U. The first band 140 is fixed to the lower support portion 131 which is a through hole that opens laterally at a position rearward of the opening 130. The second band 142 is fixed to the upper support portion 132 which is a through hole opened upward at a position above the lower support portion 131. The lower support portion 131 and the upper support portion 132 are provided at positions overlapping the single perpendicular line V when viewed from the side of the vehicle body. Thus, the lower support portion 131 and the upper support portion 132 are arranged in the vertical direction, and the three-phase harness 89 extending upward from the opening 130 can be effectively supported. In addition, by providing both the lower support portion 131 and the upper support portion 132 in the left housing 120, the space can be effectively utilized. The lower support 131 and the upper support 132 are through holes, and are easy to form, and the first belt 140 and the second belt 142 are easy to attach, and the assembly work of the power unit U is easy.

Fig. 19 is a side view of the three-phase harness 89 and the control wire 163 viewed from the right side in the vehicle width direction. Fig. 20 is a perspective view of large-diameter grommet 170 and small-diameter grommet 171 fixed by second band 142. As described above, the three-phase harness 89 and the control line 163 are wired upward in a spiral manner. Accordingly, even when the front vehicle body BF swings in the roll direction with respect to the rear vehicle body BR or the swing arm 16 of the rear vehicle body BR swings up and down, the high-voltage harness 89 can be made less susceptible to the swing operation.

The clip 140a provided at the end of the first band 140 is inserted and fixed to the lower support 131 from the side. Further, a clip 142a provided at an end of the second strap 142 is inserted and fixed from above into the upper support portion 132. This enables the high-voltage harness 89 to be effectively supported by the left housing 120, and the assembly work around the power unit U is facilitated by applying a clip having a simple structure.

The form of the electric tricycle, the shape and structure of the rear side frame and the swing arm, the shape and structure of the housing of the power unit, the handling of the high-voltage harness, and the like are not limited to the above-described embodiments, and various modifications are possible.