JP2015089702A - Structure for supporting electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably support an electric motor while securing an attachment position of a bracket for a side stand in a vehicle body frame.SOLUTION: In a structure for supporting an electric motor (3) on a vehicle body frame (2), a bracket (41) for a side stand (24) is attached to the vehicle body frame, and the electric motor is supported by having at least three locations bolt-fastened to the vehicle body frame and the bracket in such a manner as to surround an output shaft of the electric motor.

Description

  The present invention relates to a support structure for an electric motor, and more particularly to a support structure for supporting an electric motor on a vehicle body frame formed of an aluminum casting material.

  In a scooter type electric motorcycle, an electric motor is built in a rear wheel side of a rear swing arm connected to a body frame (see, for example, Patent Document 1). In the electric motorcycle described in Patent Document 1, a pivot plate is provided on a vehicle body frame, and a rear swing arm is connected to be pivotable in the vertical direction around a pivot shaft of the pivot plate. Further, a side stand is attached to the pivot plate below the pivot shaft, and the electric motorcycle can be self-supported by raising the side stand and grounding it to the ground. Thus, in the scooter type electric motorcycle, the attachment position of the side stand is separated from the electric motor.

JP2013-154859A

  By the way, in another type of electric motorcycle, the electric motor is supported around the pivot position of the body frame. In order to support the electric motor on the vehicle body frame, it is necessary to support the electric motor at three or more places so as to surround the output shaft in order to support the reaction of the driving force applied to the output shaft of the electric motor. For this reason, there has been a problem that the electric motor cannot be stably supported unless the body frame has a large side view size.

  Further, a bracket for a side stand is attached to the body frame in the vicinity of the support position of the electric motor. This bracket is formed of a forged material having a higher strength than the body frame because a local load acts on the rotating shaft portion of the side stand. Therefore, the mounting position of the bracket for the side stand must be secured on the body frame, and the support position of the electric motor with respect to the body frame is limited.

  The present invention has been made in view of the above points, and provides an electric motor support structure capable of stably supporting an electric motor while securing a mounting position of a bracket for a side stand on a vehicle body frame. Objective.

  The support structure of the electric motor of the present invention is a support structure of the electric motor for the vehicle body frame, and a bracket for a side stand is attached to the vehicle body frame. The electric motor is supported at least at three places so as to surround the output shaft.

  According to this configuration, the electric motor is supported not only by the body frame but also by the bracket for the side stand, so that the body frame can be supported at three or more locations so as to surround the output shaft of the electric motor even if the side view size of the body frame is reduced. can do. Therefore, the electric motor can be stably supported by the body frame and the bracket. Further, since the bracket for the side stand serves as a support position of the electric motor as a part of the vehicle body frame, the support position of the electric motor on the vehicle body frame is not limited by the bracket. Further, since the bracket for the side stand serves as a support position for the electric motor, it is not necessary to separately prepare a member for the support position of the electric motor, and the number of parts can be reduced.

  In the electric motor support structure of the present invention, the electric motor and the bracket are bolted from the inside of the body frame. According to this configuration, since the bolt head is hidden inside the body frame and the bracket, the appearance of the vehicle can be improved.

  In the electric motor support structure according to the present invention, the electric motor is disposed substantially at the center of the front wheel and the rear wheel, and the side stand is rotatably attached to a lower portion of the bracket. According to this configuration, since the side stand is disposed at the center of the vehicle and below the vehicle, the steering stability is improved by the concentration of mass and the lowering of the center of gravity.

  In the electric motor support structure according to the present invention, the mounting position of the bracket with respect to the vehicle body frame is within the projection plane of the electric motor and below the pivot center. According to this configuration, since the bracket is located in the projection plane of the electric motor, the support position of the bracket can be brought close to the main body portion of the electric motor. Therefore, the support position of the electric motor in the bracket can be moved toward the vehicle body frame, and the vehicle body frame can be made compact and lightweight. Further, since the bracket is located below the pivot center, mass concentration and a low center of gravity can be achieved.

  In the electric motor support structure according to the present invention, a rear end edge of the vehicle body frame is positioned in the vicinity of a mounting position of the bracket to expose the bracket. According to this configuration, the side view size of the body frame is reduced, so that the body frame can be made compact and light.

  In the electric motor support structure according to the present invention, the body frame is formed of a cast material, and the bracket is formed of a forging material. According to this configuration, a part of the electric motor is supported by the bracket of the forged material having a mechanical strength higher than that of the cast body frame, so that the electric motor can be supported more stably.

  According to the electric motor support structure of the present invention, since the electric motor is supported by the body frame and the side stand bracket, the electric motor can be stably supported even when the side view size of the body frame is reduced. it can.

It is a left view of an electric motorcycle. It is explanatory drawing of a vehicle body frame. It is explanatory drawing of the attachment structure of an electric motor. It is explanatory drawing of the attachment operation | movement of a bracket. It is explanatory drawing of the attachment operation | movement of an electric motor.

  Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. In the following, an example in which the electric motor support structure of the present invention is applied to an off-road type electric motorcycle will be described, but the application target is not limited to this and can be changed. For example, you may apply to the support structure of another type of electric motor. FIG. 1 is a left side view of an electric motorcycle 1 according to the present embodiment. In the following drawings, the front of the vehicle is indicated by an arrow FR, the rear of the vehicle is indicated by an arrow RE, the left side of the vehicle is indicated by L, and the right side of the vehicle is indicated by R.

  As shown in FIG. 1, the electric motorcycle 1 includes a body frame 2 made of an aluminum casting material on which components such as a power unit and an electrical system are mounted. The vehicle body frame 2 branches left and right from the head pipe 32 located at the front end, and extends obliquely downward toward the rear of the vehicle body. Inside the vehicle body frame 2, a battery 9 (see FIG. 3) is attached to the front side of the vehicle body, and an electric motor 3 is attached to the rear side of the vehicle body. A side cover 4 is attached to the body frame 2 so as to cover the top of the body frame 2 and enhance the appearance. A seat 5 is disposed above the side cover 4.

  The seat 5 is supported by a pair of left and right seat rails 11 (see FIG. 2) extending rearward and upward from the rear side of the body frame 2. A pair of left and right side frames 12 that support a pair of left and right seat rails 11 from below are attached to the rear side of the body frame 2. An inverter 6 that converts the DC power of the battery 9 into AC power is attached to the seat rail 11. Electric power is supplied from the battery 9 to the electric motor 3 through the inverter 6, and the drive of the electric motor 3 is controlled by a controller 7 (see FIG. 3C) provided in the battery box 8 (see FIG. 3).

  On the front end side of the vehicle body frame 2, a pair of left and right front forks 14 are supported by a head pipe 32 via a steering shaft (not shown) so as to be steerable. A front suspension for suspension of the front wheels is incorporated in the front fork 14, and the space between the vehicle body frame 2 and the front wheels 16 is buffered by the front suspension. A handle 15 is attached to the top of the front fork 14. A front wheel 16 is rotatably supported at a lower portion of the front fork 14, and an upper portion of the front wheel 16 is covered with a front fender 17.

  On the rear end side of the body frame 2, a swing arm 19 is connected to a pivot center 18 so as to be swingable in the vertical direction. A rear suspension 21 for suspension of rear wheels is attached between the body frame 2 and the swing arm 19, and the rear suspension 21 buffers the body frame 2 and the rear wheels 22. A rear wheel 22 is rotatably supported at the rear portion of the swing arm 19, and an upper portion of the rear wheel 22 is covered with a rear fender 23 provided at the rear portion of the seat 5. Power from the output shaft of the electric motor 3 is transmitted to the rear wheel 22 by a chain or the like.

  The vehicle body frame 2 is provided with a side stand 24 under which the electric motorcycle 1 is self-supporting below the pivot center 18. Since a local load acts on the rotating shaft portion of the side stand 24, the side stand 24 is attached to the vehicle body frame 2 via a dedicated bracket 41 (see FIG. 3) whose mechanical strength is increased by iron forging or aluminum forging. It is done. In the body frame 2, the electric motor 3 is attached in the vicinity of the side stand 24. In this case, in the vehicle body frame 2, it is necessary to support the electric motor 3 at three or more locations so as to surround the output shaft of the electric motor 3. However, when the size of the vehicle body frame 2 is small, a support position is secured. Is difficult.

  Therefore, in the present embodiment, not only the vehicle body frame 2 but also the bracket 41 (see FIG. 3) for the side stand 24 is provided with support portions for supporting the electric motor 3, so that the electric motor 3 is supported at three or more locations. I have to. As a result, even when the body frame 2 has a small side view size, the electric motor 3 can be stably supported at three or more locations so as to surround the output shaft of the electric motor 3. Hereinafter, the mounting structure of the electric motor 3 will be described with reference to FIGS. 2 and 3.

  FIG. 2 is an explanatory diagram of the body frame 2 according to the present embodiment. FIG. 3 is an explanatory diagram of the mounting structure of the electric motor 3 according to the present embodiment. 2A is a perspective view of the vehicle body frame 2, and FIG. 2B is a top view of the vehicle body frame 2. 3A is a view of the attachment structure of the electric motor 3 as viewed from the left side, FIG. 3B is a view of the attachment structure of the electric motor 3 as viewed from the rear side, and FIG. 3C is a view of the attachment structure of the electric motor 3 as viewed from the right side. Respectively. Moreover, although FIG. 3 is configured to attach the electric motor 3 to the left frame half 31L, the present invention is not limited to this configuration. If the side stand 24 is provided on the right side of the vehicle, the electric motor 3 may be attached to the right frame half 31R. Moreover, in FIG. 3, the battery 9 is shown with the dashed-two dotted line.

  As shown in FIGS. 2A and 2B, the vehicle body frame 2 is configured by joining a pair of left and right frame halves 31L and 31R. The frame halves 31L and 31R include head frame portions 33L and 33R that hold a single head pipe 32, and main frame portions 34L and 34R that extend rearward from the head frame portions 33L and 33R. In the head frame portions 33L and 33R, a semi-cylindrical concave portion 35 (see FIG. 3) is formed corresponding to the outer peripheral shape of the head pipe 32. With the head pipe 32 sandwiched between the recesses 35, the head frame portions 33L and 33R are bolted together so that the frame halves 31L and 31R and the head pipe 32 are integrated.

  The main frame portions 34L and 34R are structures that occupy most of the vehicle body frame 2, and the main frame portions 34L and 34R are bolted to form mounting spaces for various components. The mounting space is closed from the front to the bottom, and is opened from the top to the back. Further, seat rails 11L and 11R are attached to the upper portions of the main frame portions 34L and 34R. The seat rails 11L and 11R are reinforced from below by side frames 12L and 12R attached to the main frame portions 34L and 34R. Moreover, the periphery of the pivot center 18 of the main frame portions 34L and 34R is a space for mounting the electric motor 3 (see FIG. 3).

  As shown in FIGS. 3A to 3C, the battery box 8 having an upper surface opened is attached to the front half of the left main frame portion 34 </ b> L so as to be inclined rearward. A controller 7 is attached to the left inner surface of the battery box 8, and an accommodation space for the battery 9 is formed on the right side of the controller 7. The battery 9 is accommodated in the battery box 8 so as to be adjacent to the controller 7, and power is supplied from the battery 9 to the controller 7. The inverter 6 is attached to the seat rail 11L extending rearward from the left main frame portion 34L.

  The electric motor 3 is attached to the lower half of the left main frame 34L below the battery box 8. Since the heavy electric motor 3 is attached to the lower part of the vehicle body at the approximate center of the front wheel 16 and the rear wheel 22 (see FIG. 1), the vehicle is lowered in its center of gravity and the maneuverability and running stability are improved. In this way, the left frame half 31L is modularized with the electrical components of the controller 7 (battery box 8), the inverter 6, and the electric motor 3 attached together. The vehicle body frame 2 is assembled by joining the right frame half 31R to the modular left frame half 31L.

  From the periphery of the pivot center 18 of the left main frame portion 34L, the substantially second half portion of the electric motor 3 is exposed. For this reason, the electric motor 3 is supported by the two support positions 36 and 37 provided in the substantially first half part with respect to the main frame part 34L. A bracket 41 for the side stand 24 is attached below the pivot center 18 of the main frame portion 34L. The rear end edge 38 of the main frame portion 34L is positioned in the vicinity of the mounting position of the bracket 41 (see FIG. 4), and exposes the bracket 41 from the main frame portion 34L.

  The bracket 41 extends rearward in the projection surface (profile) of the electric motor 3, and the substantially latter half portion of the electric motor 3 is supported at one support position 44 provided at the tip. One support position 44 of the bracket 41 is located opposite to the two support positions 36 and 37 of the main frame portion 34L with the output shaft 56 of the electric motor 3 interposed therebetween. That is, the electric motor 3 is supported at three points on the main frame portion 34 </ b> L (the vehicle body frame 2) and the bracket 41 by three support positions 36, 37, 44 positioned so as to surround the output shaft 56. Thus, the bracket 41 is extended from the rear end edge 38 of the vehicle body frame 2 to support the rear half of the electric motor 3.

  Since the bracket 41 has higher mechanical strength than the main frame portion 34L, the electric motor 3 is stably supported with respect to the vehicle body frame 2 even if the arm portion 42 extending rearward from the main frame portion 34L is narrow in the vertical direction. It is possible to make it. In addition, the side stand 24 is rotatably attached to the bracket 41 on a plate portion 43 below the intermediate portion of the arm portion 42. Both ends of a coil spring 48 are attached to the engaging portions 39 and 45 of the side stand 24 and the plate portion 43, respectively. The side stand 24 is pulled up from the ground by the biasing force of the coil spring 48.

  In the bracket 41, the proximal end side of the arm portion 42 is fixed to the main frame portion 34 </ b> L, and the distal end side of the arm portion 42 is fixed to the electric motor 3. Therefore, the arm portion 42 of the bracket 41 is supported by the main frame portion 34L and the electric motor 3 so as to be supported at both ends, and the side stand 24 can be stably supported by the plate portion 43.

  With reference to FIG.4 and FIG.5, the attachment operation | movement of the bracket 41 with respect to the vehicle body frame 2 and the electric motor 3 is demonstrated. FIG. 4 is an explanatory diagram of the mounting operation of the bracket 41 according to the present embodiment. FIG. 5 is an explanatory diagram of the mounting operation of the electric motor 3 according to the present embodiment. 4A and 5A show perspective views around the bracket, and FIGS. 4B and 5B show side views of the entire body frame.

  As shown in FIGS. 4A and 4B, the side stand 24 is first attached to the main frame portion 34L of the left frame half 31L via the bracket 41. The bracket 41 is fixed in the vicinity of the rear end edge 38 of the main frame portion 34 </ b> L by bolts 49 at two locations on the proximal end side of the arm portion 42. Since the bolt is fastened from the inside of the main frame portion 34L, the bolt head is hidden inside the main frame portion 34L, and the appearance of the vehicle is improved. The bracket 41 is cantilevered with respect to the main frame portion 34L, and extends rearward from the rear end edge 38 of the main frame portion 34L.

  Inside the main frame portion 34L, support portions 51 and 52 that support the front side of the output shaft of the electric motor 3 (see FIG. 5) are provided apart in the vertical direction. A support portion 53 that supports the rear side of the output shaft of the electric motor 3 is provided on the distal end side of the arm portion 42 of the bracket 41. In this way, by fixing the bracket 41 to the main frame portion 34L, the support portions 51, 52, and 53 of the electric motor 3 are provided at three locations, two locations on the main frame portion 34L and one location on the bracket 41. Yes.

  Next, as shown in FIGS. 5A and 5B, the electric motor 3 is attached to the main frame portion 34L and the support portions 51, 52, and 53 (see FIG. 4) of the bracket 41. The front side of the electric motor 3 is attached to the support portions 51 and 52 of the main frame portion 34L, and the rear side of the electric motor 3 is attached to the support portion 53 of the bracket 41. Since the electric motor 3 is fastened by bolts 54 (only one is shown) from the inside of the main frame portion 34L and the bracket 41, the bolt head is hidden inside the main frame portion 34L and the bracket 41, and the appearance of the vehicle Has been improved.

  Thus, the electric motor 3 is supported at three points on the main frame portion 34L and the bracket 41 so as to surround the output shaft. For this reason, the electric motor 3 is stably supported so that the reaction of the driving force applied to the output shaft is supported. Further, since the arm portion 42 of the bracket 41 is located in the projection plane of the electric motor 3, the support portion 53 in the bracket 41 is brought close to the main body portion of the electric motor 3. Therefore, the support part 53 of the bracket 41 can be brought closer to the main frame part 34L side, and the vehicle body frame 2 is made compact and light. In this case, since the plate portion 43 of the bracket 41 protrudes downward so as to be separated from the projection surface of the electric motor 3, the side stand 24 does not interfere with the electric motor 3. Further, since the bracket 41 and the side stand 24 are located below the pivot center 18 in the center of the vehicle, mass concentration and a low center of gravity are achieved.

  Since the electric motor 3 is attached to the distal end side of the arm portion 42 of the bracket 41, the arm portion 42 is supported at both ends by the main frame portion 34L and the electric motor 3. Therefore, the side stand 24 is stably supported by the main frame portion 34L via the bracket 41. In addition, the electric motor 3 is attached to the main frame portion 34L in a state where the substantially second half portion is exposed. For this reason, the side view size of the main frame portion 34L (vehicle body frame 2) is kept small, and the vehicle body frame 2 is made compact and lightweight. Furthermore, it is possible to reduce the cost by reducing the casting mold when the body frame 2 is formed.

  As described above, according to the present embodiment, the electric motor 3 is supported not only by the body frame 2 but also by the bracket 41 for the side stand 24, so that the electric motor can be reduced even if the side view size of the body frame 2 is reduced. The three output shafts can be supported at three or more locations. Therefore, the electric motor 3 can be stably supported by the body frame 2 and the bracket 41. Further, since the bracket 41 for the side stand 24 becomes a support position of the electric motor 3 as a part of the vehicle body frame 2, the support position of the electric motor 3 on the vehicle body frame 2 is not limited by the bracket 41 for the side stand 24. . Further, since the bracket 41 for the side stand 24 serves as a support position for the electric motor 3, it is not necessary to separately prepare a member for the support position of the electric motor 3, and the number of parts can be reduced.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the electric motor 3 is supported at three positions with respect to the body frame 2 and the bracket 41 for the side stand 24. However, the present invention is not limited to this configuration. The electric motor 3 may be supported by at least three or more places on the vehicle body frame 2 and the side stand 24. For example, the electric motor 3 may be supported at four places.

  In the above-described embodiment, the electric motor 3 and the bracket 41 are bolted to the body frame 2 from the inside. However, the present invention is not limited to this configuration. The electric motor 3 and the bracket 41 may be configured to be bolted to the vehicle body frame 2 from the outside.

  In the above-described embodiment, the electric motor 3 is bolted to the vehicle body frame 2 and the bracket 41. However, the present invention is not limited to this configuration. The electric motor 3 may be fixed to the body frame 2 and the side stand 24 in any manner, and may be fixed by welding or press fitting, for example.

  In the above-described embodiment, the body frame 2 is formed of an aluminum cast material and the bracket 41 is formed of an iron forging material or an aluminum forging material. However, the present invention is not limited to this configuration. The body frame 2 and the bracket 41 may be formed of the same material. For example, the body frame 2 and the bracket 41 may be formed of an aluminum casting material.

  In the above-described embodiment, the configuration in which the electric motor 3 is supported by the left and right split body frame 2 and the bracket 41 has been described, but the configuration is not limited thereto. The electric motor 3 may be supported by the left and right integrated body frame 2 and the bracket 41.

  As described above, the present invention has an effect that the electric motor can be stably supported while securing the mounting position of the bracket for the side stand on the body frame, and is particularly formed of an aluminum casting material. This is useful for a support structure for supporting an electric motor on a body frame.

DESCRIPTION OF SYMBOLS 1 Electric motorcycle 2 Body frame 3 Electric motor 16 Front wheel 18 Pivot center 22 Rear wheel 24 Side stand 36, 37, 44 Support position 38 Rear edge 41 Bracket

Claims (6)

An electric motor support structure for a vehicle body frame,
A bracket for a side stand is attached to the body frame,
The electric motor support structure, wherein the electric motor is supported by at least three places so as to surround the output shaft of the electric motor by the body frame and the bracket.   The electric motor support structure according to claim 1, wherein the electric motor and the bracket are bolted from the inside of the body frame. The electric motor is disposed substantially at the center of the front wheel and the rear wheel,
The electric motor support structure according to claim 1 or 2, wherein the side stand is rotatably attached to a lower portion of the bracket.   4. The electric motor according to claim 1, wherein a mounting position of the bracket with respect to the vehicle body frame is located within a projection plane of the electric motor and below a pivot center. 5. Motor support structure.   5. The electric motor support structure according to claim 4, wherein a rear end edge of the vehicle body frame is positioned in the vicinity of an attachment position of the bracket to expose the bracket.   6. The electric motor support structure according to claim 1, wherein the body frame is formed of a cast material, and the bracket is formed of a forged material.

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