CN104627294B - Electric motorcycle - Google Patents

Abstract

The invention relates to an electric motorcycle which comprises a motorcycle body frame, a storage box, a rear rocking arm and a motor unit, wherein the motorcycle body frame is provided with a head pipe, a front frame, a right rear frame and a left rear frame, the storage box is arranged between the right rear frame and the left rear frame, the rear rocking arm comprises a rear rocking arm main frame and a motor supporting piece, and the motor unit is suspended on the right rear frame and the left rear frame through the rear rocking arm and drives a rear wheel. The rear rocking arm main frame is provided with a left main arm, a right main arm, a first connecting piece and a second connecting piece. The left main arm and the right main arm approximately extend in the vertical direction and are arranged in parallel, and motorcycle body side mounting portions are arranged at the upper end of the left main arm and the upper end of the right main arm and are used for enabling the rear rocking arm to be connected with the left rear frame and the right rear frame in a pivot mode. The first connecting piece crosses over the lower portion of the left main arm and the lower portion of the right main arm. The second connecting piece is approximately in a U shape when being overlooked from the position above a motorcycle body, crosses over the left main arm and the right main arm, and is located above the first connecting piece. The motor supporting piece is connected between the first connecting piece and the second connecting piece, is close to one side in the width direction of the motorcycle body and comprises a motor unit fixing part used for fixing the motor unit.

Description

Electric motorcycle

Technical Field

The invention relates to an electric motorcycle, in particular to a rear rocker arm structure of an electric motorcycle.

Background

[ background Art document ]

A conventional electric motorcycle drives a vehicle by using a motor unit as a power source of the vehicle, and power output from a battery is supplied to a motor control unit, which determines and outputs driving power to the motor unit to drive the motor unit based on an instruction issued by an operator, and drives the vehicle by driving a rear wheel of the motor unit.

Generally, the body structure of the electric motorcycle has a suspension system for buffering and absorbing the force applied to the body by the ground. Patent document 1 below discloses a suspension system for an electric motorcycle, including: front fork, back rocking arm and back shock absorber. As shown in fig. 1 of patent document 1, the rear swing arm is a single swing arm type rear swing arm which is provided only on one side of a vehicle body, and has a pivot support portion at one end for pivotally connecting the rear swing arm to the vehicle body frame and attaching the rear swing arm to the vehicle body frame, and a motor unit housing support portion at the other end for covering and fixing the motor unit, and the motor unit housing support portion, the motor unit, and the rear wheel are coaxially provided, whereby the motor unit and the rear wheel can be supported on the vehicle body frame so as to be swung up and down via the rear swing arm.

[ patent document ]

[ patent document 1] Japanese patent laid-open publication No. 2012-71801

Disclosure of Invention

[ problems to be solved by the invention ]

Although the single rocker arm type rear rocker arm of patent document 1 described above supports the motor unit and the rear wheel on the vehicle body frame in a vertically swinging manner, the vehicle is lightweight as a whole and the appearance is simple and beautiful, the requirement for the structural strength of the rear rocker arm is high, and therefore, in order to ensure the strength of the rear rocker arm, the design and manufacture of the rear rocker arm are generally performed by aluminum casting and integral molding, which results in a significant increase in the production cost.

In addition, when the rear rocker arm is manufactured by aluminum casting and integral molding as in patent document 1, the motor unit housing support portion of the rear rocker arm made of aluminum resonates due to the influence of vibration and noise of the motor unit, thereby increasing vibration and noise of the entire vehicle.

Therefore, in order to reduce the production cost and take structural strength of the rear rocker arm into consideration, a dual rocker arm type rear rocker arm is considered. However, in the case of using the conventional double rocker arm type rear rocker arm, a part of the rear rocker arm is disposed in the vicinity of the rear wheel on the other side of the vehicle body with respect to the side on which the motor unit is mounted in the width direction of the vehicle body, which causes inconvenience in replacing the tire, and also causes a problem in that the appearance of the vehicle cannot be made simple and the weight of the vehicle body is easily increased, which is clearly contrary to the concept of reducing the weight of the electric vehicle.

[ means for solving problems ]

The present invention has been made in view of the above-described problems occurring in the prior art, and an object of the present invention is to provide an electric motorcycle having a rear rocker arm which can improve the ease of replacing a tire, reduce the weight of a vehicle body, ensure the structural strength of the rear rocker arm, and achieve the advantage of low manufacturing cost.

In order to solve the above problems, the present invention has the following features.

First, a first aspect of the present invention is an electric motorcycle including: a vehicle body frame having: a head pipe; a front frame extending obliquely downward from a lower end of the head pipe toward a rear of the vehicle; a pair of right and left rear frames extending rearward of the vehicle from the bottom of the front frame and extending obliquely upward rearward of the vehicle; a storage box disposed between the pair of right and left rear frames; a rear rocker arm including a rear rocker arm main frame and a motor support; and a motor unit suspended on the pair of right and left rear frames via the rear swing arm and driving a rear wheel; wherein the rear rocker arm main frame has a pair of left and right main arms and has a first connecting member and a second connecting member; the pair of left and right main arms extend substantially in the vertical direction and are arranged in parallel to each other, and the pair of left and right main arms are provided at upper end portions thereof with vehicle body side attaching portions for pivotally attaching the rear swing arm to left and right rear frames of a vehicle body frame, the first coupling member is bridged between lower portions of the pair of left and right main arms, the second coupling member is substantially U-shaped in plan view from above the vehicle body and bridged between the pair of left and right main arms and is positioned above the first coupling member, the motor stay member is connected between the first coupling member and the second coupling member and is positioned at a position deviated to one side in the vehicle body width direction, and the motor stay member includes a motor unit fixing portion for fixing the motor unit to the motor stay member.

According to the technical constitution of the first aspect of the present invention, the first connecting member and the second connecting member are provided between the left and right rear frames of the rear swing arm pivoted to the vehicle body frame, and the motor stay is provided only on the side of the vehicle body to which the motor unit is attached between the first connecting member and the second connecting member, so that the rear swing arm can be disposed without any part of the devices relative to the vicinity of the rear wheel on the other side of the vehicle body on the side to which the motor unit is attached in the vehicle body width direction, and not only the easiness of tire replacement can be improved, but also the unnecessary device disposition can be reduced to maintain the beauty and simplicity of the vehicle and to reduce the weight of the vehicle body, thereby improving the lightweight property of the vehicle.

In addition, the first connecting piece is bridged between the lower parts of the left main arm and the right main arm of the rear rocker arm main frame, the second connecting piece which is approximately U-shaped is bridged above the first connecting piece between the left main arm and the right main arm of the rear rocker arm main frame, and the motor supporting piece is connected with the first connecting piece and the second connecting piece.

Further, the rear rocker arm structure of the first aspect of the invention is not limited to being manufactured from a specific material, and therefore, the manufacturing cost thereof as a whole can be reduced as compared with a conventional single rocker arm type rear rocker arm that is integrally formed, and a rear rocker arm of an electric motorcycle that is lightweight, has high structural strength, and has the advantage of low manufacturing cost can be obtained.

A second aspect of the present invention is the electric motorcycle according to the first aspect, wherein the pair of left and right main arms are disposed so as to be inclined rearward and downward of the vehicle body in a front-rear direction of the vehicle body, and the second coupling member is disposed substantially orthogonally to the pair of left and right main arms when viewed from a side in a vehicle width direction.

According to the technical configuration of the second aspect of the present invention, since the pair of left and right main arms of the rear rocker main frame is disposed in the front-rear direction of the vehicle body so as to be inclined downward toward the rear of the vehicle body, and the second coupling is disposed substantially orthogonally to the pair of left and right main arms, when the rear wheel receives an impact force from the ground, the urging force transmitted to the pair of left and right main arms via the motor stay and the second coupling is only a normal force and does not include a component force parallel to the pair of left and right main arms, whereby the influence of the ground impact force or the like on the connection between the second coupling and the pair of left and right main arms can be greatly reduced, the structural strength of the entire rear rocker can be improved, and the structural damage can be avoided.

A third aspect of the present invention is the electric motorcycle according to the first or second aspect, wherein the second coupling member is disposed around the storage box behind the storage box, and the left and right main arms are respectively positioned on both left and right sides of the storage box, and the first coupling member is positioned below the storage box when viewed from the vehicle body width direction side.

According to the technical configuration of the third aspect of the present invention, since the rear swing arm is disposed so as to surround the storage box on the main frame of the rear swing arm, even when the storage box is deep in the vertical direction of the vehicle body, the space between the storage box and the rear wheel can be utilized, so that the rear swing arm can be secured with a sufficient space to swing up and down with the rear of the vehicle body without interfering with the storage box, and the vehicle body does not need to be increased in the longitudinal length thereof, thereby maintaining the downsizing in the longitudinal direction of the vehicle and further improving the weight reduction of the entire vehicle.

A fourth aspect of the present invention is the electric motorcycle according to the first or second aspect, wherein at least one of the pair of left and right main arms is provided with a second coupler reinforcing member connected between the at least one of the pair of left and right main arms and the second coupler.

In the technical configuration of the fourth aspect of the present invention, the second joint reinforcing member is provided to at least one of the pair of left and right main arms of the rear rocker main frame, so that the strength of the joint between the pair of left and right main arms and the second joint can be increased, the structural strength of the entire rear rocker can be further increased, and the resistance of the rear rocker to an impact when the rear vehicle body swings up and down, a bending moment generated by a vehicle turning, and the like can be increased.

A fifth aspect of the present invention is the electric motorcycle according to the first or second aspect, wherein a motor case fixing portion for fixing a motor case covering an outer side of the motor unit is provided on one of the pair of left and right main arms located on the same side in a vehicle width direction as the motor stay.

According to the technical configuration of the fifth aspect of the present invention, since the motor case fixing portion is provided on one of the pair of left and right main arms of the rear rocker main frame in the vehicle body direction near the motor unit, and the motor case is provided outside the motor unit of the vehicle, and the motor case is fixed by the motor case fixing portion, the cost is relatively low compared to a conventional rear rocker in which the motor case and the rear rocker are integrally formed, and therefore, the motor case can cover and protect the motor unit and the motor wiring harness while maintaining low manufacturing cost, the appearance of the vehicle can be enhanced, and the motor wiring harness can be stored without being disturbed or damaged by external factors.

A sixth aspect of the present invention is the electric motorcycle according to the fifth aspect, wherein the motor case fixing portion is connected between the second joint and the one of the pair of left and right main arms, and can also serve as a second joint reinforcing member.

According to the technical configuration of the sixth aspect of the invention, the motor case fixing portion is provided so as to be connected between the second link and the one of the pair of left and right main arms, and serves as the second link reinforcing member, so that the coupling strength between the pair of left and right main arms and the second link can be increased without increasing the number of components of the rear rocker arm, the structural strength of the entire rear rocker arm can be further increased, the force to be applied to the rear rocker arm when swinging up and down the rear vehicle body, the force to be applied to the rear rocker arm when the vehicle turns, and the like can be increased, and the weight of the entire vehicle can be reduced.

A seventh aspect of the present invention is the electric motorcycle according to the first or second aspect, wherein one of the pair of left and right main arms located on a different side in the vehicle body width direction from the motor stay is provided with a first coupler reinforcement connected between the first coupler and the one of the pair of left and right main arms.

According to the technical constitution of the seventh aspect of the invention, since the motor stay is provided on the side closer to the motor unit in the vehicle width direction, the side closer to the motor unit of the rear rocker arm frame has a certain support strength, and the side farther from the motor unit of the rear rocker arm frame has a relatively weak strength, so that the first coupler reinforcement is provided on one of the pair of left and right main arms located on the different side in the vehicle width direction from the motor stay, whereby the coupling strength between the first coupler and one of the pair of left and right main arms farther from the motor unit can be reinforced, and the support strength on both sides in the vehicle width direction of the rear rocker arm main frame can be balanced to improve the structural strength of the entire rear rocker arm, so that the rear rocker arm can effectively receive an impact when the rear vehicle body swings up and down, a bending moment generated by the vehicle turning, and the like.

An eighth aspect of the present invention is the electric motorcycle according to the first or second aspect, wherein a foot stool connection member connected to a foot stool for supporting a vehicle body is provided on the first connection member, and the foot stool connection member is located on a different side in a vehicle body width direction from the motor stay.

According to the technical constitution of the eighth aspect of the invention, since the foot stool connection member for connecting the vehicle body supporting foot stool and the vehicle body is disposed on the rear rocker arm at a different side in the vehicle width direction from the motor stay, when the rear rocker arm main frame is simultaneously subjected to a force applied to the rear rocker arm main frame by the motor stay generated by, for example, the vertical swing of the rear vehicle body and a force applied to the rear rocker arm main frame by the foot stool connection member generated by the standing and parking of the vehicle, the two different stresses can be uniformly dispersed in the rear rocker arm main frame, and the structural strength of the entire rear rocker arm can be improved.

A ninth aspect of the present invention is the electric motorcycle according to the eighth aspect, wherein a foot stand connecting member reinforcement member is provided on the first connecting member, and is connected between the first connecting member, the motor stay, and the foot stand connecting member.

According to the technical constitution of the ninth invention, since the foot stool connector reinforcing member is connected between the first connecting member, the motor stay and the foot stool connector, the structural strength between the first connecting member and the foot stool connector and the structural strength between the motor stay and the first connecting member can be increased when the vehicle is erected, and the structural strength of the entire rear rocker arm can be further improved.

Drawings

Fig. 1 is a left side view of an electric motorcycle according to a preferred embodiment of the present invention.

Fig. 2 is a right side view of a rear vehicle body of the electric motorcycle of the preferred embodiment of the present invention.

Fig. 3 is a left side view of the rear vehicle body of the electric motorcycle according to the preferred embodiment of the present invention with the left and right side covers removed.

Fig. 4 is an assembly view of the rear swing arm, the motor unit, and the motor housing of the electric motorcycle according to the preferred embodiment of the present invention.

Fig. 5(a) - (E) are various views of the rear rocker arm of the preferred embodiment of the present invention: (A) perspective view (B), front view (C), left view (D), rear view (E), and right view.

Detailed Description

Embodiments of the present invention will be described below based on the attached drawings.

As shown in fig. 1, the present embodiment is applied to an electric motorcycle 1. However, the present invention is not limited to the scooter type electric motorcycle, and may be applied to other types of motorcycles, such as a hybrid motorcycle including an engine, an electric three-wheeled motorcycle, or an electric off-road vehicle, and the like, and the present invention can be applied to obtain the effects of the present invention.

In the following description, the front, rear, left, and right directions respectively represent the front, rear, left, and right directions as viewed from a rider riding the electric motorcycle 1.

As shown in fig. 1 and 2, an electric motorcycle 1 according to a preferred embodiment of the present invention is a scooter-type electric motorcycle including a pair of steering handles 2, a body frame 20, a front cover 3, a front wheel 4, a foot board 5, a motor unit 6, a rear wheel 8, a seat part 9, side covers 10(10L, 10R), a rear cover 11, and the like.

< steering handle >

As shown in fig. 1, a steering handle 2 is provided on a head pipe 21 of a vehicle body frame 20, which will be described later, so as to extend substantially in the vehicle width direction, and controls the direction in which the vehicle travels. The steering handle 2 has a switch knob 2A, and the rider can generate a mechanical signal by turning the switch knob 2A of the steering handle 2, convert the mechanical signal into an electrical signal by a switch knob sensor (not shown), and transmit the electrical signal to the motor control unit 14, i.e., can drive and control the motor unit 6, thereby advancing the electric motorcycle 1 and controlling the advancing speed.

< vehicle body frame >

As shown in fig. 1 and 3, the vehicle body frame 20 includes a head pipe 21 that supports the steering handle 2, a front frame 23 that extends from a lower end portion of the head pipe 21 to be inclined substantially downward toward the rear of the vehicle, and a pair of left and right rear frames 24L, 24R. The pair of left and right rear frames 24L and 24R each include a step frame 241L and 241R extending from the bottom of the front frame 23 toward the vehicle rear side of the electric motorcycle 1, a rising frame 242L and 242R extending from the step frame 241L and 241R obliquely toward the vehicle rear upper side of the electric motorcycle 1, and a cushion lower frame 243L and 243R extending from the rising frame 242L and 242R toward the rear side of the electric motorcycle 1. The head pipe 21 is pivotally provided at a lower end thereof with a front fork 22, and the front fork 22 rotatably supports the front wheel 4.

The foot rest frames 241L and 241R are coupled to the bottom of the front frame 23 and the ends thereof, and extend backward in parallel with the left and right frames. The both frame ends of the step portion frames 241L, 241R then extend in parallel obliquely toward the vehicle rear upper side of the electric motorcycle 1 to constitute rise portion frames 242L, 242R. The rising frames 242L, 242R rise obliquely upward rearward and extend in parallel to the lower portion near the front end of the seat cushion 9, that is, from the ends of the rising frames 242L, 242R toward the vehicle rear of the electric motorcycle 1 to the rear end frame 25, thereby constituting seat cushion lower frames 243L, 243R.

The cushion lower frames 243L and 243R may be configured to be asymmetric in the left-right direction, and for example, as shown in fig. 3, the left cushion lower frame 243L is configured to be formed by connecting a plurality of frame sections having different inclinations with respect to the ground, and the right cushion lower frame 243R extends rearward of the vehicle so as to maintain the inclination with respect to the ground substantially constant. However, the structure of the seat cushion lower frames 243L and 243R is not limited to this, and other forms of left-right asymmetrical structures or left-right symmetrical structures may be employed.

In addition, as shown in fig. 1, the door-shaped bracket 26 can be added to the upper surface of the rear end of the lower frame 243L, 243R of the seat cushion portion, so as to not only increase the overall strength of the lower frame 243L, 243R of the seat cushion portion and support the seat cushion portion 9, but also protect the vehicle components (such as the Motor Control Unit (MCU)14 shown in fig. 1) from the above and prevent the vehicle components from being pressed and impacted by the seat cushion portion 9.

< storage case >

As shown in fig. 1 and 3, a storage box 13 for storing personal belongings of a rider is provided between the pair of left and right rear frames 24L and 24R. Generally, a storage space for a battery (not shown) for supplying power to the electric vehicle 1 may be provided below the step portion 5, but the storage space for the battery may be provided integrally with the storage box 13. In the latter case, the storage box 13 is generally formed in a vertically long shape, and the storage box 13 has a sufficient depth to accommodate the battery and personal belongings of the rider. However, the storage box 13 is not limited to a vertically long shape, and may be designed in other shapes according to the shape of the vehicle and the arrangement of the mounting devices.

< seat locking mechanism >

As shown in fig. 1, a seat unit 9 is provided above the storage box 13, and is attached to the storage box 13 disposed between the pair of left and right rear frames 24L and 24R so as to be openable and closable about a hinge pin H at a front end portion thereof. The rear end of the cushion part 9 has a seat lock mechanism 12, and the seat part 9 is locked by the seat lock mechanism 12.

< side hood >

As shown in fig. 1 and 2, left and right covers 10L and 10R of the electric motorcycle 1 are provided on both left and right sides of the storage box 13 below the seat unit 9 so as to cover the storage box 13. A rear hood 11 is provided behind the cushion portion 9 and is connected between the side hoods 10L and 10R at the rear of the vehicle. The side covers 10L and 10R may be two separate covers or may be integrally formed covers.

< Motor Unit >

Next, the motor unit 6 will be described in detail.

As shown in fig. 1 and 3, the motor unit 6 is provided on one of the left and right sides of the rear wheel 8, is connected to a wheel shaft of the rear wheel 8 via a reduction gear (not shown), and drives the rear wheel to drive the vehicle to travel. The motor control unit 14 for driving and controlling the motor unit is entirely or mostly surrounded by the side covers 10L, 10R and the rear cover 11, and is disposed above the rear wheel 8 between the cushion portion lower frames 243L, 243R of the pair of left and right rear frames 24L, 24R and at a position behind the storage box 13, and substantially directly below the gate bracket 26. With the above configuration, the motor control unit 14 can be completely protected from being damaged by external force or the like.

As shown in fig. 3, three power transmission lines 40B for transmitting driving power of the motor and at least one motor signal transmission line 40A for transmitting status information of the motor are connected between the motor control unit 14 and the motor unit 6, and each of the power transmission lines 40B and the motor signal transmission lines 40A has one end connected to the motor unit 6 and one end connected to the motor control unit 14 and between the motor control unit 14 and the motor unit 6. In addition, the motor signal transmission line 40A and the power transmission line 40B are preferably bundled together to form a motor wiring harness 40, thereby improving the neatness of the wiring arrangement and increasing the protection of the wiring. However, the arrangement of the power transmission line 40B and the motor signal transmission line 40A is not limited to this, and other arrangements may be designed according to the shape of the vehicle and the arrangement of the mounted device.

Next, as shown in fig. 3 and 4, the motor unit 6 includes a motor unit main body 61 and a motor unit base plate 62. The motor unit main body 61 is mounted and fixed on the motor unit base plate 62, and has a power transmission line connection portion 611 and a motor signal transmission line connection portion 612, and the power transmission line connection portion 611 is connected to the three power transmission lines 40B to receive the power transmitted from the motor control unit 14 as the driving power thereof, and the motor signal transmission line connection portion 612 is connected to the motor signal transmission line 40A to transmit the state information signal (e.g., the angular position of the rotor, the temperature, etc.) of the motor unit 6 to the motor control unit 14, thereby allowing the motor control unit 14 to control the operation of the motor unit 6 through the three power transmission lines 40B based on the current state information of the motor unit 6. As shown in fig. 4, the motor unit main body 61 also includes a motor case fixing portion 61A for fixing the motor case 7 to the motor case fixing portion 61A.

As shown in fig. 3, 4, and 5A, the motor unit base plate 62 is fixed to a motor fixing portion 32A of a motor stay 32 of a rear swing arm 30 described below on the vehicle body front side in the vehicle body front-rear direction of the motor unit base plate 62, whereby the motor unit 6 can be suspended from the vehicle body left and right rear frames 24L, 24R via the rear swing arm 30.

As shown in fig. 3 and 4, the motor unit base plate 62 also includes a rear fender attachment portion 621 provided above the motor unit base plate 62, for attaching the motor unit base plate 62 to the rear fender 15 fixed above the rear wheel 8, thereby fixing the rear fender 15 to the motor unit 6. The motor unit base plate 62 also includes a motor case fixing portion 62A for fixing the motor case 7 to the motor case fixing portion 62A.

As shown in fig. 3 and 4, a rear-shock connector 622 is provided on the vehicle-body rear side in the vehicle-body front-rear direction of the motor-unit base plate 62, and the rear shock 16 is connected thereto. The rear cushion 16 extends substantially in the vehicle body vertical direction, has one end connected to the rear cushion fixing bracket 28 provided on the left cushion portion lower frame 243L of the vehicle body left rear frame 24L, and has one end connected to the rear cushion connecting portion 622, whereby the rear cushion connecting portion 622 can absorb and cushion the force acting on the rear wheels from the ground during the traveling of the vehicle.

< Motor housing >

As shown in fig. 3, the motor case 7 covers the outside of the motor unit 6, and the motor case 7 extends substantially from the front upper side to the rear lower side in the vehicle body front-rear direction, and covers the motor unit 6 and the motor wiring harness 40, thereby enhancing the aesthetic appearance of the vehicle, protecting the motor unit 6, and ensuring that the motor wiring harness 40 is stored without being disturbed or damaged by external factors. The motor case 7 is not limited to the one extending substantially from the front upper side to the rear lower side in the vehicle body longitudinal direction as described above, and may be designed in another arrangement according to the shape of the vehicle and the arrangement of the mounting device.

As shown in fig. 4, the motor case 7 includes a first motor case fixing portion 71, a second motor case fixing portion 72, and a third motor case fixing portion 73, which are attached and fixed to a motor case fixing portion 301 of the rear swing arm 30, a motor case fixing portion 61A of the motor unit main body portion 61, and a motor case fixing portion 62A of the motor unit base plate 62, which will be described later. The motor case 7 can be firmly fixed to the motor unit 6 and the rear swing arm 30 by the fixing manner of the motor case 7.

< rear swing arm >

Next, the rear rocker arm 30 will be described in detail.

Referring to fig. 5(a) to 5(E), the rear swing arm 30 includes a rear swing arm main frame 31 and a motor stay 32, and the rear swing arm main frame 31 includes a pair of left and right main arms 311L and 311R, a first link 312, and a second link 313. The pair of left and right main arms 311L and 311R extend substantially in the vertical direction and are arranged parallel to each other, and a first coupling member 312 is bridged between the lower portions of the pair of left and right main arms 311L and 311R. The left and right ends of the first connector 312 may be connected to the lower ends of the pair of left and right main arms 311L and 311R, respectively, or may be connected to substantially lower portions of the pair of left and right main arms 311L and 311R, respectively. Further, according to fig. 5(B) and 5(D), the second link 313 is bridged between the pair of left and right main arms 311L and 311R above the first link 312, and according to fig. 5(a), the second link is substantially U-shaped in a top view from above the vehicle body.

Referring to fig. 5(a), 5(B), and 5(D), a motor stay 32 is provided between the first link 312 and the second link 313 at a position offset to the side of the vehicle body width direction where the motor unit 6 is provided, and the motor stay 32 is substantially sheet-shaped and provided between the first link 312 and the second link 313 so as to be substantially perpendicular to the first link 312 and the second link 313, respectively. By the arrangement of the motor support member 32, a rear rocker arm structure with high rigidity can be obtained, and the rear rocker arm structure can bear the acting force generated when the rear vehicle body swings up and down and also can bear the bending moment generated when the vehicle turns, so that the rear rocker arm structure is prevented from being damaged by the acting force and the moment. Further, by limiting the motor stay 32 to a sheet shape and providing the motor stay 32 only at a position offset to the vehicle body side to which the motor unit 6 is attached, the rear swing arm 30 can be prevented as much as possible from being arranged on the other side of the rear wheel 8 with respect to the vehicle body side to which the motor unit 6 is attached, thereby improving the ease of tire replacement and maintaining the aesthetic appearance and lightweight of the vehicle. However, the motor stay 32 is not limited to a sheet shape, and may be a tube shape or other shapes, and may be any other structure that is sufficient to support the entire strength of the rear rocker main frame 31 and is provided to be offset to the vehicle body side to which the motor unit 6 is attached, without being limited to the above arrangement.

As shown in fig. 5(a), the rear swing arm 30 can be pivotally connected to the rear swing arm fixing bracket 27 of the vehicle body left and right rear frames 24L, 24R by providing the vehicle body side mounting portions 33 at the upper end portions of the pair of left and right main arms 311L, 311R, respectively, as shown in fig. 3. As shown in fig. 5(a), 5(C) and 5(E), the motor support 32 of the rear swing arm 30 is provided with a motor fixing unit 32A, so that the rear swing arm 30 and the motor unit 6 can be fixedly connected via the motor fixing unit 32A as shown in fig. 3 and 4. The motor fixing unit 32A may be configured as four holes as shown in fig. 5(C), and the motor unit base plate 62 may be locked thereto by a fastening means such as a screw, but the configuration of the motor fixing unit 32A is not limited thereto, and may be other configuration means capable of fixedly connecting the motor fixing unit 32A and the motor unit 6.

As shown in fig. 5(C) and 5(E), the second coupling 313 is disposed substantially perpendicular to the pair of left and right main arms 311L and 311R when viewed from the upper side in the left-right direction of the vehicle body. By configuring the second link 313 to be orthogonal to the pair of left and right main arms 311L and 311R, when the second link 313 is affected by the impact force from the ground, the urging force transmitted to the pair of left and right main arms 311L and 311R through the motor stay 32 and the second link 313 is only a forward urging force (F shown in fig. 5 (C)), and does not include a component force parallel to the pair of left and right main arms 311L and 311R, whereby the influence of the impact force from the ground and the like on the connection between the second link 313 and the pair of left and right main arms 311L and 311R can be reduced, and the structural strength of the entire rear rocker 30 can be improved.

As shown in fig. 1, the rear swing arm 30 is preferably located behind the storage box 13 and in front of the rear wheel 8, and the rear swing arm 30 is preferably disposed so as to surround the storage box 13. That is, the second coupling member 313 of the rear swing arm 30, which is substantially U-shaped, is disposed around the storage box behind the storage box, the pair of left and right main arms 311L and 311R are disposed on both left and right sides of the storage box 13 so as to be inclined downward toward the rear of the vehicle body, and the first coupling member 312 is disposed below the storage box 13. The arrangement of the rear swing arm 30 as described above makes it possible to utilize the space between the storage box and the rear wheel, and to ensure that the rear swing arm 30 does not interfere with the storage box 13 when swinging up and down with the rear of the vehicle body, and to eliminate the need to increase the front-rear length of the vehicle body, thereby keeping the size of the vehicle in the front-rear direction and the weight of the entire vehicle body small. However, the spatial arrangement of the rear swing arm 30 is not limited to this, and the rear swing arm may be designed in other shapes according to the shape of the vehicle and the arrangement of the mounting devices. The pair of left and right main arms 311L and 311R are not limited to being disposed so as to be inclined downward toward the rear of the vehicle body, and may be disposed so as to be inclined downward toward the front of the vehicle body or extend downward from above in the vertical direction.

Next, as shown in fig. 5(a), second link reinforcements 301 and 302 are provided at the joints between the second link 313 of the rear rocker 30 and the left and right main arms 311L and 311R, respectively, so that the coupling strength between the pair of left and right main arms 311L and 311R and the second link 313 is increased, the structural strength of the entire rear rocker 30 is further increased, and the receiving force of the rear rocker 30, such as an impact when the rear vehicle body swings up and down and a bending moment generated by turning the vehicle, is increased. The second link reinforcements 301 and 302 are preferably substantially square in shape, are positioned below the second link 313 of the rear swing arm 30, and are arranged such that any two adjacent and substantially vertical sides thereof are connected to the pair of left and right main arms 311L and 311R and the second link 313, respectively. However, the shape of the second link reinforcements 301 and 302 is not limited to the square shape, and may be other shapes, and may be other configurations that sufficiently reinforce the coupling strength between the pair of left and right main arms 311L and 311R and the second coupling 313, without being limited to the above arrangement.

The second link reinforcements 301 and 302 are preferably provided with a motor housing fixing portion on one side (in the present embodiment, the second link reinforcement 301) located in the vehicle width direction and close to the motor unit 6, for fixing the motor housing 7 to the motor housing fixing portion (the second link reinforcement 301). However, the motor housing fixing portion is not limited to being provided on the second link reinforcement 301, and may be provided at any position on the pair of left and right main arms 311L and 311R of the motor unit 6 or the second link 313 in the vehicle width direction.

Next, as shown in fig. 5(a) and 5(B), a first coupler reinforcement 303 is provided at one of the pair of left and right main arms 311L and 311R, which is located on the different side from the motor stay 32 in the vehicle width direction, so as to bridge between a lower end portion of the one of the pair of left and right main arms 311L and 311R, which is located on the different side from the motor stay 32 in the vehicle width direction, and the first coupler 312. By the arrangement of the first coupler reinforcement 303, the coupling strength between one of the pair of left and right main arms 311L and 311R, which is located on the different side from the motor stay 32 in the vehicle width direction, and the first coupler 312 can be strengthened, and the rigidity of the entire rear rocker arm 30 can be improved by balancing the support strength on both sides of the rear rocker arm main frame 31 in the vehicle width direction, so that the rear rocker arm can effectively receive the impact when the rear vehicle body swings up and down, the bending moment generated by the vehicle turning, and the like. The first link reinforcement 303 is not limited to the above arrangement, and may be configured to enhance the coupling strength between the pair of left and right main arms 311L and 311R and the first link 312 to achieve the above effects.

Next, as shown in fig. 5(a), 5(B), and 5(D), a foot stool connector 304 is provided to the first connector, and the vehicle body supporting foot stool 50 can be connected to the foot stool connector 304 as shown in fig. 2. Further, the foot stool coupler 304 is preferably provided on a different side in the vehicle width direction from the motor support 32, so that when the rear rocker arm main frame 31 is simultaneously subjected to a force applied to the rear rocker arm main frame 31 by the motor support 32 due to, for example, vertical swinging of the rear vehicle body and a force applied to the rear rocker arm main frame 31 by the foot stool coupler 304 due to standing and parking of the vehicle, the two different stresses can be uniformly dispersed in the rear rocker arm main frame 31, and therefore, the structural strength of the entire rear rocker arm 30 can be improved without concentrating the applied stress on one side of the rear rocker arm main frame 31 and causing damage to the rear rocker arm 30.

As shown in fig. 5(a) and 5(B), a foot stool connector reinforcement 305 is provided on the first connector 312, and is connected between the first connector 312 and the foot stool connector 304 on the vehicle body front side of the rear swing arm 30. The structural strength between the first connecting member 312 and the foot frame connecting member 304 can be increased when the vehicle is erected by the provision of the foot frame connecting member reinforcement 305. Further, the foot stool connector reinforcement 305 is preferably provided so as to extend rearward and upward in the vehicle body longitudinal direction in a portion close to the motor unit 6 in the vehicle body width direction and is connected to the motor stay 32, so that the foot stool connector reinforcement 305 can also have an effect of increasing the structural strength between the motor stay 32 and the first connector 312. The foot stool connector reinforcement 305 is not limited to the above arrangement, and may be configured to sufficiently reinforce the structural strength between the first connector 312 and the foot stool connector 304.

As shown in fig. 5(a), 5(C), and 5(E), a rear fender attachment 306 is provided on the second link 313 on a different side in the vehicle width direction from the motor stay 32, and extends from the second link 313 toward the rear upper side of the vehicle body in the vehicle body longitudinal direction, whereby the rear fender attachment 306 can be connected and fixed to a fixing bracket 15A provided on the rear fender 15 on the other side in the vehicle width direction from the vehicle body side on which the motor unit 6 is provided, as shown in fig. 2, and the rear fender 150 can be attached and fixed to the rear rocker arm 30.

Next, as shown in fig. 5(a), 5(C) and 5(E), a brake wire holder 307 is provided at a lower end portion of at least one of the pair of left and right main arms 311L and 311R to support and protect a brake wire (not shown) for transmitting a brake signal.

Further, the devices of the rear rocker arm 30 (i.e., the left main arm 311L, the right main arm 311R, the first coupler 312, the second coupler 313, the motor stay 32, the vehicle body attachment portion 33, the motor case fixing portion 301 (second coupler reinforcement), the second coupler reinforcement 302, the first coupler reinforcement 303, the foot stool connector 304, the foot stool connector reinforcement 305, the rear fender connector 306, the brake cable bracket 307, etc.) are preferably connected by Welding or soldering (Welding).

The technical contents and technical features of the present invention have been disclosed as above, but those skilled in the art can make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention. Accordingly, the scope of the present invention should not be limited to the embodiments disclosed, but should include various alternatives and modifications without departing from the present invention, which are encompassed by the appended claims.

Description of the symbols

1 electric motorcycle

2 steering handle

2A electric switch rotating handle

3 front vehicle cover

4 front wheel

5 foot pedal

6 Motor Unit

61 Motor Unit Main body part

61A motor casing fixed part

611 power transmission line connection part

612 motor signal transmission line connecting part

62 motor unit base plate

62A motor casing fixed part

621 rear mudguard connecting part

622 rear shock absorber connecting part

7 Motor shell

71 first motor housing fixing part

72 second Motor housing fixing part

73 third motor housing fixing part

8 rear wheel

9 cushion part

10 side car cover

10L left side cover

Side cover on the right side of 10R

11 rear vehicle cover

12-seat locking mechanism

13 storage box

14 motor control unit

15 rear mudguard

15A fixed bolster

16 rear shock absorber

20 vehicle body frame

21 head pipe

22 front fork

23 front frame

24L, 24R left and right rear frames

241L, 241R left and right pedal frame

242L, 242R left and right ascending section frames

Lower frames of left and right seat cushions of 243L and 243R

25 tail end frame

26-door-shaped bracket

27 rear rocker arm fixing bracket

28 rear shock absorber fixing support

30 rear rocker arm

301 motor housing fixing part/second connector reinforcing member

302 second connector reinforcement

303 first connecting member reinforcing member

304 foot stool connecting piece

305 foot stool connecting piece reinforcement

306 rear mudguard connecting piece

307 brake line support

31 rear rocker arm main frame

311L left main arm

311R right main arm

312 first connecting piece

313 second connecting member

32 motor support

32A motor fixing part

33 vehicle body mounting part

40 motor wiring harness

40A motor signal transmission line

40B power transmission line

50 foot rest for supporting vehicle body

F acting force

H-shaped hinge pin

Claims (9)

1. An electric motorcycle, comprising:

a vehicle body frame having: a head pipe; a front frame extending obliquely downward from a lower end of the head pipe toward a rear of the vehicle; a pair of right and left rear frames extending rearward of the vehicle from the bottom of the front frame and extending obliquely upward rearward of the vehicle;

a storage box disposed between the pair of right and left rear frames;

a rear rocker arm including a rear rocker arm main frame and a motor support; and

a motor unit suspended on the pair of right and left rear frames via the rear swing arm and driving a rear wheel; wherein,

the rear rocker arm main frame is provided with a pair of left and right main arms and is provided with a first connecting piece and a second connecting piece;

the pair of left and right main arms extend substantially in the vertical direction and are disposed parallel to each other, and the pair of left and right main arms are provided at upper end portions thereof with vehicle body side mounting portions for pivotally mounting the rear swing arm to left and right rear frames of a vehicle body frame,

the first link member is bridged between the lower portions of the pair of left and right main arms,

the second link is substantially U-shaped in plan view from above the vehicle body, and is located above the first link across the space between the pair of left and right main arms,

the motor support member is connected between the first link member and the second link member and is located at a position offset to one side in the vehicle width direction, and the motor support member includes a motor unit fixing portion for fixing the motor unit to the motor support member.

2. The electric motorcycle of claim 1, wherein

The pair of left and right main arms is disposed so as to be inclined toward the rear lower side of the vehicle body in the front-rear direction of the vehicle body, and the second coupling member is disposed substantially orthogonally to the pair of left and right main arms when viewed from the side in the width direction of the vehicle body.

3. The electric motorcycle according to claim 1 or 2, wherein

The second coupling member is disposed behind the storage box so as to surround the storage box, the left and right main arms are respectively located on both left and right sides of the storage box, and the first coupling member is located below the storage box when viewed from the vehicle body width direction side.

4. The electric motorcycle according to claim 1 or 2, wherein

At least one of the pair of left and right main arms is provided with a second coupler reinforcing member connected between the second coupler and the at least one of the pair of left and right main arms.

5. The electric motorcycle according to claim 1 or 2, wherein

One of the pair of left and right main arms located on the same side of the motor support member in the width direction of the vehicle body is provided with a motor housing fixing portion for fixing a motor housing covering the outside of the motor unit.

6. Electric motorcycle according to claim 5, wherein

The motor housing fixing portion is connected between the second coupler and the one of the pair of left and right main arms, and can also serve as a second coupler reinforcing member.

7. The electric motorcycle according to claim 1 or 2, wherein

One of the pair of left and right main arms located on the different side in the vehicle body width direction from the motor stay is provided with a first coupler reinforcement connected between the first coupler and the one of the pair of left and right main arms.

8. The electric motorcycle according to claim 1 or 2, wherein

The first connecting member is provided with a foot stand connecting member which is connected to a foot stand for supporting a vehicle body, and the foot stand connecting member is located on a different side of the motor supporting member in a vehicle body width direction.

9. The electric motorcycle of claim 8, wherein

A foot stand connecting member reinforcing member is provided on the first connecting member and connected between the first connecting member, the motor supporting member and the foot stand connecting member.