WO2020012791A1 - Vehicle body frame structure for saddle-type electric vehicle - Google Patents

Abstract

A vehicle body frame structure for a saddle-type electric vehicle comprises: a head pipe (31) that supports a front wheel (2) so as to be able to steer the front wheel (2); a front-section frame (40) that extends from the head pipe (31) toward the rear of the vehicle; a rear-section frame (50) that supports a seat (15); a battery case (60) formed so as to be able to accommodate a battery, the battery case (60) being disposed farther toward the rear of the vehicle than the head pipe (31), and being connected to the front-section frame (40); and a motor case (70) that accommodates a motor that drives using the power of the battery, the motor case (70) being connected to the battery case (60) and the rear-section frame (50), and the battery case (60) and the motor case (70) being used as the vehicle body frame (30).

Description

Body frame structure of saddle-ride type electric vehicle

The present invention relates to a vehicle body frame structure for a saddle-ride type electric vehicle.
Priority is claimed on Japanese Patent Application No. 2018-133305 filed on July 13, 2018, the content of which is incorporated herein by reference.

There is a saddle-ride type electric vehicle in which a battery case for accommodating a battery is disposed immediately after a head pipe, and a motor is disposed behind the battery case (for example, see Patent Document 1).

Patent Literature 1 includes a battery case that accommodates a battery serving as a power source of an electric motor and is disposed between a front wheel and a rear wheel. The electric motor is disposed rearward of the battery case and forward of the rear wheel. Is disclosed. In this saddle type electric vehicle, the battery case is supported by the body frame.

Japanese Patent Publication No. WO 2013/098894

バ ッ テ リ By the way, since the battery is a heavy object, it is desired to suppress the increase in the weight of the entire vehicle in the saddle-ride type electric vehicle.

Accordingly, the present invention provides a vehicle body frame structure of a saddle-ride type electric vehicle that can reduce the weight of the entire vehicle.

(1) A vehicle body frame structure for a saddle-ride type electric vehicle according to one aspect of the present invention includes a head pipe (31) for supporting a front wheel (2) so as to be steerable, and extending rearward from the head pipe (31) to the vehicle. A front frame (40, 140), a rear frame (50) for supporting the seat (15), and a battery that is formed so as to be able to be housed therein; A battery case (60, 160) connected to the frame (40, 140) and a motor driven by the power of the battery are housed, and connected to the battery case (60, 160) and the rear frame (50). A motor case (70, 170), and the battery case (60, 160) and the motor case (70, 170) Used as 130).

According to the above configuration, by using the battery case and the motor case as the body frame, the number of members used for the body frame can be reduced as compared with the related art. Thus, the weight of the entire vehicle can be reduced.

(2) In the vehicle body frame structure for a saddle-ride type electric vehicle according to (1), the front frame (40) and the battery case (60) are connected to a first connection portion (32) and the first connection. The second connecting portion (33) provided below the portion (32) may be connected to each other.

According to the above configuration, since the front frame and the battery case are connected on both the upper and lower sides, compared with the configuration in which the front frame and the battery case are connected only at one place in a side view, Strength can be secured. For this reason, it is not necessary to extend the front frame to the rear of the battery case in order to secure the strength of the body frame, so that the strength of the body frame is secured compared to the case where the front frame extends to the rear of the battery case. , While reducing the weight of the entire vehicle.

(3) In the vehicle body frame structure for a saddle-ride type electric vehicle according to (2), at least one of the motor case (70) and the rear frame (50) can rotate a rear wheel (3). The battery case (60) and the motor case (70) are connected to the lower end of the head pipe (31) and the swing arm (9) in a side view. May be connected to each other above and below the first straight line (L1) connecting the swing center of the first and second rockers.

According to the above configuration, it is possible to increase the rigidity with respect to the force applied during acceleration of the vehicle, as compared with the configuration in which the connection portion between the battery case and the motor case is provided only below the first straight line. Therefore, the exercise performance of the saddle-ride type electric vehicle can be improved.

(4) In the vehicle body frame structure for a saddle-ride type electric vehicle according to the above (2) or (3), the battery case (60) and the motor case (70) are formed of the head pipe (31) in a side view. It may be connected to each other above and below a second straight line (L2) connecting the lower end and the center point of the axle of the rear wheel (3).

According to the above configuration, it is possible to increase the rigidity with respect to the force applied during acceleration of the vehicle, as compared with a configuration in which the connection point between the battery case and the motor case is provided only below the second straight line. Therefore, the exercise performance of the saddle-ride type electric vehicle can be improved.

(5) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of (2) to (4), a connection portion (34) between the battery case (60) and the motor case (70); The connecting portion (32) between the front frame (40) and the battery case (60) may be provided on a third straight line (L3) passing through the center of the axle of the rear wheel (3) in side view. Good.

According to the above configuration, rigidity in the pitching direction can be ensured. Therefore, the traveling performance of the saddle-ride type electric vehicle can be improved.

(6) In the vehicle body frame structure for a saddle-ride type electric vehicle according to (1), the front frame (140) extends outward from the head pipe (31) in the vehicle width direction of the battery case (160). A main frame (141) connected to the motor case (170) and extending from the head pipe (31) to a position lower than the main frame (141); And a down frame (42) connected to the

According to the above configuration, the connection between the front frame and the battery case concentrates downward as compared with the configuration in which both the main frame and the down frame are connected to the battery case. For this reason, since the upper part of the battery case is easily displaced in the vehicle width direction with respect to the front frame, the torsion center of the vehicle body is lowered. Therefore, the steering stability of the saddle-ride type electric vehicle can be improved.

(7) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of the above (1) to (6), the motor case (70, 170) includes a connecting piece connected to the rear frame (50). (73), and a rear cushion (13) may be connected to the connection piece (73).

According to the above configuration, the connection portion with the rear cushion which requires rigidity is provided in the motor case which is a rigid member constituting the body frame. Therefore, high-rigidity members provided other than the motor case can be minimized, and the entire vehicle can be reduced in weight.

(8) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of (1) to (7), the battery case (60, 160) and the motor case (70, 170) are made of aluminum or aluminum. The motor case (70, 170) may be formed of an alloy, and may be formed thicker than the battery case (60, 160).

According to the above configuration, the entire vehicle can be reduced in weight as compared with a configuration in which the battery case or the motor case is formed of a steel material.
Further, as compared with a configuration in which the battery case is formed thicker than the motor case, the rigidity of the battery case is reduced, and the vehicle body frame can be easily bent. In particular, when the motor case supports the swing arm, the thickness of the motor case is set to be large in order to give the motor case rigidity. Therefore, by forming the battery case thinner than the motor case, the vehicle body is formed. It becomes easier to have a bend in the frame. Therefore, the steering stability of the saddle-ride type electric vehicle can be improved.

(9) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of (1) to (8), the front frame (140) and the battery case (160) may include the head pipe in a side view. They may be connected only below the second straight line (L2) connecting the lower end of (31) and the center point of the axle of the rear wheel (3).

According to the above configuration, the connection portion between the front frame and the battery case is arranged to be concentrated below in comparison with the configuration in which the front frame and the battery case are connected to each other above the second straight line. You. For this reason, since the upper part of the battery case is easily displaced in the vehicle width direction with respect to the front frame, the torsion center of the vehicle body is lowered. Therefore, the steering stability of the saddle-ride type electric vehicle can be improved.

(10) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of the above (1) to (9), the battery case (60, 160) is arranged in a vehicle vertical direction rather than a vehicle longitudinal direction in a side view. It may be formed large.

According to the above configuration, the space occupied by the battery case in the vehicle front-rear direction can be reduced as compared with the configuration in which the battery case is formed larger in the vehicle front-rear direction than in the vehicle vertical direction in side view. Therefore, the degree of freedom in designing the arrangement of the battery case in the longitudinal direction of the vehicle is improved, so that the position of the heavy battery can be easily adjusted in the longitudinal direction of the vehicle, and the position of the center of gravity of the vehicle can be easily adjusted. Therefore, the kinetic performance of the saddle-ride type electric vehicle can be improved by, for example, disposing the center of gravity of the vehicle further forward.

(11) In the vehicle body frame structure for a saddle-ride type electric vehicle according to any one of (1) to (10), an upper end of the motor case (70, 170) is an upper end of the battery case (60, 160). And a power control unit (7) for controlling the motor may be arranged above the motor case (70, 170).

According to the above configuration, since the power control unit is disposed close to the battery and the motor, the power control unit is connected to the battery and the motor as compared to a configuration in which the power control unit is disposed behind the motor case. High-voltage lines can be shortened. Therefore, energy loss can be reduced.

According to the above-described vehicle body frame structure of the saddle-ride type electric vehicle, the weight of the entire vehicle can be reduced.

FIG. 2 is a left side view of the motorcycle according to the first embodiment. FIG. 1 is a perspective view of a motorcycle according to a first embodiment. It is a perspective view showing a part of body frame of a 1st embodiment. It is a perspective view showing a part of body frame of a 1st embodiment. It is a left view of the motorcycle of a 2nd embodiment. It is a perspective view showing a front frame of a 2nd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that directions such as front, rear, up, down, left, and right in the following description are the same as directions in a vehicle described below. That is, the up-down direction matches the vertical direction, and the left-right direction matches the vehicle width direction. In the drawings used in the following description, arrow UP indicates upward, arrow FR indicates forward, and arrow LH indicates left.

[First Embodiment]
FIG. 1 is a left side view of the motorcycle according to the first embodiment.
As shown in FIG. 1, the motorcycle 1 of the present embodiment is a saddle-ride type electric vehicle. The motorcycle 1 includes a front wheel 2, a rear wheel 3, a body frame 30, a power control unit (hereinafter, referred to as a PCU (Power Control Unit)) 7, a swing arm 9, a rear cushion 13, a seat 15, And a vehicle body cover 17.

The front wheel 2 is pivotally supported by lower ends of a pair of left and right front forks 4. The upper part of the front fork 4 is steerably supported at the front end of the body frame 30 via the steering stem 5. A bar handle 5a for steering is attached to an upper portion of the steering stem 5.

FIG. 2 is a perspective view of the motorcycle according to the first embodiment. 2, illustration of the seat 15 and the vehicle body cover 17 is omitted.
As shown in FIGS. 1 and 2, the body frame 30 includes at least a head pipe 31, a front frame 40, a rear frame 50, a battery case 60, and a motor case 70.
The head pipe 31 is arranged at a front end of the body frame 30. The head pipe 31 steerably supports steering system components including the front wheels 2. The steering stem 5 is inserted through the head pipe 31.

The front frame 40 extends rearward from the head pipe 31.
The rear frame 50 is arranged behind the front frame 40. The rear frame 50 is provided separately from the front frame 40.
Battery case 60 houses a battery that supplies power to the motor. The battery case 60 is disposed forward of the rear frame 50. The battery case 60 is connected to the front frame 40 at an upper fastening portion 32 (first connection portion) and a lower fastening portion 33 (second connection portion).

The motor case 70 houses a motor. The motor has a stator and a rotor, and is driven by battery power. The motor case 70 is disposed behind the front frame 40. Motor case 70 is connected to battery case 60 at upper fastening portion 34 and lower fastening portion 35. The motor case 70 is connected to the rear frame 50 at the upper fastening portion 36 and the lower fastening portion 37. The motor case 70 may further house a transmission.
Details of the body frame 30 will be described later.

As shown in FIG. 1, the PCU 7 is a control device that includes a PDU (Power Drive Unit) that is a motor driver, an ECU (Electric Control Unit) that controls the PDU, and the like. The PCU 7 is disposed above the motor case 70, and is supported by the body frame 30 such as the motor case 70.

The swing arm 9 is provided below the rear part of the vehicle body. The swing arm 9 extends back and forth. The front end of the swing arm 9 is supported by the body frame 30 so as to be vertically swingable. Specifically, the swing arm 9 is supported by a lower rear portion of the motor case 70 via a pivot shaft 76 so as to be vertically swingable.

The rear wheel 3 is rotatably supported by the rear end of the swing arm 9. The rear wheel 3 is connected to the motor via a chain-type transmission mechanism 11 disposed on the left side of the rear of the vehicle body.

The rear cushion 13 is provided at the center of the vehicle width at the rear of the vehicle body. The rear cushion 13 integrally includes a shock absorber having a compression coil spring and a damper. The rear cushion 13 is interposed between the body frame 30 and the swing arm 9. Specifically, the upper end of the rear cushion 13 is connected to a first rear connection piece 73 of the motor case 70 which will be described later. The lower end of the rear cushion 13 is connected to the front of the swing arm 9.

The seat 15 is disposed above the motor case 70 and the rear frame 50 and behind the upper portion of the battery case 60. The seat 15 is supported from below by a pair of seat rails 51 of the rear frame 50 described below.

The body cover 17 covers the body frame 30 and the like. The vehicle body cover 17 is formed of, for example, a synthetic resin. The vehicle body cover 17 includes a front cover 18 and a rear cover 19. The front cover 18 covers the upper part of the front frame 40 and the upper part of the battery case 60 from above and from both left and right sides. The rear cover 19 covers the rear frame 50 from above.

Hereinafter, the vehicle body frame structure of the present embodiment will be described in detail. In the vehicle body frame structure of the present embodiment, the battery case 60 and the motor case 70 are used as the vehicle body frame 30. As described above, the body frame 30 includes the head pipe 31, the front frame 40, the rear frame 50, the battery case 60, and the motor case 70.

As shown in FIGS. 1 and 2, the front frame 40 includes a pair of left and right main frames 41 extending downward and rearward from the upper portion of the head pipe 31, and extends rearward and downward from the lower portion of the head pipe 31, and then extends downward. And a pair of left and right down frames 42 that bend and extend.

The pair of main frames 41 are formed of, for example, a pipe material. The pair of main frames 41 extend outward in the vehicle width direction so as to be separated from each other as going from the front to the rear. At the rear end of each main frame 41, an outer cylinder 41a fastened to the battery case 60 is provided. A bolt screwed into the battery case 60 is inserted into the outer cylinder 41a. The outer cylinder 41a forms the above-described upper fastening portion 32 in which the front frame 40 and the battery case 60 are connected to each other.

The pair of down frames 42 are formed of, for example, a pipe material. The pair of down frames 42 are provided below the pair of main frames 41. The pair of down frames 42 extend outward in the vehicle width direction so as to be separated from each other as going from the front to the rear. The rear end of each down frame 42 is provided below the rear end of the main frame 41. At the rear end of each down frame 42, an outer cylinder 42a fastened to the battery case 60 is provided. A bolt screwed into the battery case 60 is inserted into the outer cylinder 42a. The outer cylinder 42a forms the above-described lower fastening portion 33 in which the front frame 40 and the battery case 60 are connected to each other. The outer cylinder 42a of the down frame 42 is arranged at the same position in the front-rear direction as the outer cylinder 41a of the main frame 41. A radiator 25 for cooling the motor and the PCU 7 is mounted in front of the down frame 42.

FIG. 3 is a perspective view showing a part of the vehicle body frame of the first embodiment.
As shown in FIGS. 2 and 3, the front frame 40 includes a pair of left and right side gussets 43 connecting the main frame 41 and the down frame 42, and an upper gusset 44 connecting the pair of main frames 41. Further prepare.

The pair of side gussets 43 are each formed in a plate shape and are welded to the main frame 41 and the down frame 42. The side gussets 43 extend in the up-down direction, and connect outer sides of the main frame 41 and the down frame 42 in the vehicle width direction. The front edge of the side gusset 43 is connected to the head pipe 31. The rear edge of the side gusset 43 extends linearly in the vertical direction when viewed from the side.

上部 As shown in FIG. 3, the upper gusset 44 is formed in a plate shape and is welded to the pair of main frames 41. The upper gusset 44 extends in the left-right direction and connects the upper surfaces of the pair of main frames 41 to each other. The rear edge of the upper gusset 44 extends linearly in the vehicle width direction when viewed from above and below at substantially the same position in the front-rear direction as the rear edge of the side gusset 43.

後 As shown in FIG. 2, the rear frame 50 includes a pair of left and right seat rails 51, a pair of left and right support pipes 52, and a cross pipe 53.

The pair of seat rails 51 is formed of, for example, a pipe material. The pair of seat rails 51 are arranged at an interval in the vehicle width direction, and extend forward and downward from the rear end of the body frame 30. The rear ends of the pair of seat rails 51 are connected to each other by a plate-shaped rear bracket 54 extending in the vehicle width direction. Front and rear intermediate portions of the pair of seat rails 51 are connected to each other by a plate-shaped front bracket 55 extending in the vehicle width direction.

(4) The pair of support pipes 52 are arranged at intervals in the vehicle width direction. The pair of support pipes 52 are respectively connected to the seat rails 51. The left support pipe 52 extends forward and downward from the front-rear intermediate portion of the left seat rail 51. The right support pipe 52 extends forward and downward from the front-rear intermediate portion of the right seat rail 51. The support pipe 52 and the seat rail 51 are connected to each other by a plate-like side bracket 56 extending vertically. At the front end of each support pipe 52, an outer cylinder 52a through which a bolt is inserted is provided. The outer cylinder 52a forms the above-described lower fastening portion 37 in which the rear frame 50 and the motor case 70 are connected to each other.

The cross pipe 53 extends in the vehicle width direction and is provided between the front ends of the pair of seat rails 51. The cross pipe 53 is provided with a pair of support brackets 57 projecting downward. The support brackets 57 are arranged at intervals in the vehicle width direction. The support bracket 57 is fastened to the motor case 70. The support bracket 57 constitutes the above-described upper fastening portion 36 in which the rear frame 50 and the motor case 70 are connected to each other.

サ ブ The sub-battery 27 is disposed inside the rear frame 50. The sub-battery 27 is configured to be able to supply power to the PCU 7 or the like separately from or simultaneously with the battery housed in the battery case 60.

バ ッ テ リ As shown in FIGS. 2 and 3, the battery case 60 is made of aluminum or an aluminum alloy. The battery case 60 is formed in a rectangular parallelepiped shape extending in front and rear, up and down, and left and right. The battery case 60 is formed to be larger in the vertical direction than in the front-rear direction when viewed from the side.

As shown in FIG. 3, the battery case 60 includes a first front fastening seat 61 and a second front fastening seat 62 fastened to the front frame 40, and a first rear fastening seat 63 fastened to the motor case 70. A second rear fastening seat 64.

A pair of left and right first front fastening seats 61 are provided on the front upper portion of the battery case 60. The pair of first front fastening seats 61 protrude forward from the left and right sides at the upper portion of the front surface of the battery case 60. A bolt inserted into the outer cylinder 41a of the left main frame 41 is screwed into the left first front fastening seat 61. A bolt inserted into the outer cylinder 41a of the right main frame 41 is screwed into the right first front fastening seat 61. Thus, the battery case 60 and the main frame 41 are fastened. The first front fastening seat 61 forms an upper fastening portion 32 between the front frame 40 and the battery case 60 described above.

一 対 A pair of left and right second front fastening seats 62 are provided at a lower front portion of the battery case 60. The pair of second front fastening seats 62 protrude forward from both left and right sides at the lower portion of the front surface of the battery case 60. A bolt inserted into the outer cylinder 42a of the left down frame 42 is screwed into the second front fastening seat 62 on the left side. A bolt inserted into the outer cylinder 42a of the right down frame 42 is screwed into the right second front fastening seat 62. Thereby, the battery case 60 and the down frame 42 are fastened. The second front fastening seat 62 forms a lower fastening portion 33 between the above-described front frame 40 and the battery case 60.

A pair of first rear fastening seats 63 are provided at the rear of the battery case 60 on the left and right sides. The pair of first rear fastening seats 63 is provided between the first front fastening seat 61 and the second front fastening seat 62 in the vertical direction. The pair of first rear fastening seats 63 protrude rearward from the left and right sides of the rear surface of the battery case 60. The pair of first rear fastening seats 63 are fastened to the motor case 70. The first rear fastening seat 63 forms the above-described upper fastening portion 34 in which the battery case 60 and the motor case 70 are connected to each other.

一 対 A pair of left and right second rear fastening seats 64 are provided at a lower rear portion of the battery case 60. The pair of second rear fastening seats 64 are provided below the second front fastening seat 62. The pair of second rear fastening seats 64 protrude rearward from the left and right sides of the rear surface of the battery case 60. The pair of second rear fastening seats 64 are fastened to the motor case 70. The second rear fastening seat 64 constitutes the above-described lower fastening portion 35 in which the battery case 60 and the motor case 70 are connected to each other.

１A first rib 65 and a second rib 66 are further formed on the battery case 60. The first rib 65 and the second rib 66 are provided on both left and right sides of the battery case 60, respectively. The first rib 65 and the second rib 66 protrude outward from the side surface of the battery case 60 in the vehicle width direction. The first rib 65 extends so as to connect the first front fastening seat 61 and the first rear fastening seat 63 in a side view. The second rib 66 extends so as to connect the second front fastening seat 62 and the first rear fastening seat 63 in a side view.

モ ー タ As shown in FIG. 2, the motor case 70 is formed of aluminum or an aluminum alloy. Motor case 70 is formed thicker than battery case 60. The upper end of motor case 70 is arranged below the upper end of battery case 60. In the motor case 70, a first front connection piece 71, a second front connection piece 72, a first rear connection piece 73 (connection piece), and a second rear connection piece 74 are formed.

FIG. 4 is a perspective view showing a part of the vehicle body frame of the first embodiment.
As shown in FIG. 4, the first front connection piece 71 is provided in a pair of right and left at the upper front part of the motor case 70. The pair of first front connection pieces 71 are formed so as to protrude forward and upward. The first front connection piece 71 on the left side is fastened to the first rear fastening seat 63 on the left side of the battery case 60. The right first front connection piece 71 is fastened to the right first rear fastening seat 63 of the battery case 60. The first front connection piece 71 forms the upper fastening portion 34 between the motor case 70 and the battery case 60 described above.

一 対 A pair of left and right second front connection pieces 72 are provided at the lower front part of the motor case 70. The pair of second front connection pieces 72 are formed so as to protrude forward. The second front connection piece 72 on the left side is fastened to the second rear fastening seat 64 on the left side of the battery case 60. The right second front connection piece 72 is fastened to the right second rear fastening seat 64 of the battery case 60. The second front connection piece 72 forms the lower fastening portion 35 between the motor case 70 and the battery case 60 described above.

A pair of first rear connection pieces 73 are provided on the rear upper part of the motor case 70 on the left and right sides. The pair of first rear connection pieces 73 are formed so as to protrude rearward and upward. The left first rear connection piece 73 is fastened to the left support bracket 57 of the rear frame 50. The right first rear connection piece 73 is fastened to the right support bracket 57 of the rear frame 50. The first rear connection piece 73 forms the upper fastening portion 36 between the motor case 70 and the rear frame 50 described above. The pair of first rear connection pieces 73 is connected to the upper end of the rear cushion 13 disposed between the pair of first rear connection pieces 73.

The second rear connection piece 74 is provided at the rear of the motor case 70. The second rear connection piece 74 is provided at an upper and lower middle portion of the motor case 70. The second rear connection piece 74 is formed so as to project rearward. The second rear connection piece 74 is fastened to the outer cylinder 52a of the left support pipe 52 and the outer cylinder 52a of the right support pipe 52. The second rear connection piece 74 forms a lower fastening portion 37 between the motor case 70 and the rear frame 50 described above.

一 対 A pair of left and right step holders 21 are attached to the lower part of the motor case 70. The step holder 21 is connected to a support piece 75 extending downward from the motor case 70 and a pivot shaft 76. The step holder 21 supports a step 22 on which the occupant places his or her foot. Further, a step guard 23 is attached to the step holder 21.

Here, the position of each fastening portion in the body frame 30 of the first embodiment will be described in detail.
As shown in FIG. 1, an upper fastening portion 34 between the battery case 60 and the motor case 70 connects the lower end of the head pipe 31 and the swing center of the swing arm 9 (the center of the pivot shaft 76) in a side view. It is provided above the straight line L1. The lower fastening portion 35 between the battery case 60 and the motor case 70 is provided below the first straight line L1 in a side view. That is, the battery case 60 and the motor case 70 are connected to each other above and below the first straight line L1 in a side view.

The upper fastening portion 34 between the battery case 60 and the motor case 70 is provided above a second straight line L2 connecting the lower end of the head pipe 31 and the center point of the axle of the rear wheel 3 in a side view. The lower fastening portion 35 between the battery case 60 and the motor case 70 is provided below the second straight line L2 in a side view. That is, the battery case 60 and the motor case 70 are connected to each other above and below the second straight line L2 in a side view.

Furthermore, the upper fastening portion 32 between the front frame 40 and the battery case 60 is provided above the second straight line L2 in a side view. The lower fastening portion 33 between the front frame 40 and the battery case 60 is provided below the second straight line L2 in a side view. That is, the front frame 40 and the battery case 60 are connected to each other above and below the second straight line L2 in a side view.

Further, the upper fastening portion 34 between the battery case 60 and the motor case 70 and the upper fastening portion 32 between the front frame 40 and the battery case 60 are on a third straight line L3 passing through the center of the axle of the rear wheel 3 in side view. It is provided in.

As described above, in the vehicle body frame structure of the present embodiment, the battery case 60 fastened to the front frame 40 and the motor case 70 connected to the battery case 60 and the rear frame 50 form the body frame 30. Used. According to this configuration, the number of members used for the body frame 30 can be reduced as compared with the related art. Thus, the weight of the entire vehicle can be reduced.

Further, since the battery case 60 is disposed forward of the rear frame 50 supporting the seat 15, the battery case, which is a heavy object, is compared with a case where the battery case is disposed at the same position in the front-rear direction with the rear frame. Is arranged in front. Therefore, the position of the center of gravity of the vehicle can be optimized, and the exercise performance of the motorcycle 1 can be improved.

前 Front frame 40 and battery case 60 are connected to each other at upper fastening portion 32 and lower fastening portion 33 provided below upper fastening portion 32. According to this configuration, since the front frame 40 and the battery case 60 are connected on both upper and lower sides, the vehicle body is compared with a configuration in which the front frame and the battery case are connected only at one place in a side view. The strength of the frame 30 can be secured. Therefore, it is not necessary to extend the front frame to the rear of the battery case in order to secure the strength of the vehicle body frame. And the weight of the entire vehicle can be reduced.

The battery case 60 and the motor case 70 are connected to each other above and below a first straight line L1 connecting the lower end of the head pipe 31 and the swing center of the swing arm 9 in a side view. According to this configuration, the rigidity with respect to the force applied during acceleration of the vehicle can be increased as compared with the configuration in which the fastening portion between the battery case 60 and the motor case 70 is provided only below the first straight line L1. . Therefore, the exercise performance of the motorcycle 1 can be improved.

The battery case 60 and the motor case 70 are connected to each other above and below a second straight line L2 connecting the lower end of the head pipe 31 and the center point of the axle of the rear wheel 3 in a side view. According to this configuration, the rigidity with respect to the force applied during acceleration of the vehicle can be increased as compared with the configuration in which the fastening portion between the battery case 60 and the motor case 70 is provided only below the second straight line L2. . Therefore, the exercise performance of the motorcycle 1 can be improved.

The upper fastening portion 34 between the battery case 60 and the motor case 70 and the upper fastening portion 32 between the front frame 40 and the battery case 60 are positioned on a third straight line L3 passing through the center of the rear wheel axle in side view. Is provided. According to this configuration, rigidity in the pitching direction can be secured. Therefore, the traveling performance of the motorcycle 1 can be improved.

The motor case 70 also includes a first rear connection piece 73 connected to the rear frame 50, and the rear cushion 13 is connected to the first rear connection piece 73. According to this configuration, the connection portion with the rear cushion 13 which requires rigidity is provided on the motor case 70 which is a rigid member constituting the vehicle body frame 30. Accordingly, high-rigidity members provided other than the motor case 70 can be minimized, and the entire vehicle can be reduced in weight.

The battery case 60 and the motor case 70 are formed of aluminum or an aluminum alloy. Motor case 70 is formed thicker than battery case 60. According to this configuration, the entire vehicle can be reduced in weight as compared with a configuration in which the battery case or the motor case is formed of a steel material.
Furthermore, compared to a configuration in which the battery case is formed thicker than the motor case, the rigidity of the battery case 60 is reduced, and the body frame 30 is more likely to have flexibility. In particular, when the motor case 70 supports the swing arm 9 as in the present embodiment, the thickness of the motor case 70 is set to be large in order to make the motor case 70 rigid. By forming the body frame 30 to be thinner than the case 70, the body frame 30 can be easily bent. Therefore, the steering stability of the motorcycle 1 can be improved.

The battery case 60 is formed to be larger in the vertical direction than in the front-rear direction when viewed from the side. According to this configuration, the space occupied by the battery case 60 in the front-rear direction can be reduced as compared with the configuration in which the battery case is formed larger in the front-rear direction than in the vertical direction in side view. Therefore, the degree of freedom in designing the arrangement of the battery case 60 in the front-rear direction is improved, so that the position of the heavy battery can be easily adjusted in the front-rear direction, and the center of gravity of the vehicle can be easily adjusted. Therefore, the exercise performance of the motorcycle 1 can be improved by, for example, disposing the center of gravity of the vehicle further forward.

The upper end of the motor case 70 is provided below the upper end of the battery case 60, and the PCU 7 that controls the motor is disposed above the motor case 70. According to this configuration, since the PCU 7 is arranged close to the battery and the motor, the high-voltage line connecting the PCU 7 to the battery and the motor is shortened, for example, as compared with a configuration in which the PCU is arranged behind the motor case 70. be able to. Therefore, energy loss can be reduced.

A first rib 65 extending to connect the first front fastening seat 61 and the first rear fastening seat 63, and a second front fastening seat 62 and a first rear fastening seat are provided on a side surface of the battery case 60. A second rib 66 extending so as to connect the second rib 63 is formed. As a result, the upper fastening portion 32 between the front frame 40 and the battery case 60 and the upper fastening portion 34 and the lower fastening portion 35 between the battery case 60 and the motor case 70 respectively become the first rib 65 and the second rib 65. Since the connection is made by the connection 66, the strength against the load applied to the battery case 60 from the front frame 40 and the motor case 70 can be improved. Therefore, the rigidity of the body frame 30 can be improved.

[Second embodiment]
Next, a second embodiment will be described. In the first embodiment, the front frame 40 is connected to the battery case 60. On the other hand, the second embodiment is different from the first embodiment in that the front frame 140 is connected to the battery case 160 and the motor case 170. The configuration other than that described below is the same as that of the first embodiment.

FIG. 5 is a left side view of the motorcycle according to the second embodiment.
As shown in FIG. 5, the vehicle body frame 130 includes a front frame 140, a battery case 160, and a motor case 170 instead of the front frame 40, the battery case 60, and the motor case 70 of the first embodiment. The front frame 140 extends rearward from the head pipe 31. Battery case 160 is arranged forward of rear frame 50. Battery case 160 is connected to front frame 140 at lower fastening portion 33. Motor case 170 is connected to front frame 140 at fastening portion 132. Further, motor case 170 is connected to battery case 160 at upper fastening portion 134 and lower fastening portion 135. The motor case 170 is connected to the rear frame 50 at the upper fastening portion 36 and the lower fastening portion 37.

Hereinafter, the vehicle body frame structure of the present embodiment will be described in detail. In the vehicle body frame structure of the present embodiment, the battery case 160 and the motor case 170 are used as the vehicle body frame 130. The body frame 130 includes a head pipe 31, a front frame 140, a rear frame 50, a battery case 160, and a motor case 170.

FIG. 6 is a perspective view showing a front frame of the second embodiment.
As shown in FIGS. 5 and 6, the front frame 140 includes a pair of main frames 141 extending downward and rearward from the head pipe 31 instead of the main frame 41 of the first embodiment. The pair of main frames 141 extend rearward from the head pipe 31 through the outside of the battery case 160 in the vehicle width direction. Specifically, the pair of main frames 141 extend outward in the vehicle width direction so as to be spaced apart from each other as going from the front to the rear in front of the battery case 160, and then bend rearward. It extends parallel to each other on both left and right sides.

各 As shown in FIG. 6, each main frame 141 includes an upper pipe 141a and a lower pipe 141b. The upper pipe 141a extends downward and rearward from the upper part of the head pipe 31. The lower pipe 141b extends downward and rearward from a lower part of the head pipe 31. The rear end of the lower pipe 141b is connected to the rear end of the upper pipe 141a. Thus, each main frame 141 is formed in a V-shape that expands forward in a side view. The rear end of each main frame 141 is provided behind the battery case 160 (see FIG. 5). An outer cylinder 141c fastened to the motor case 170 is provided at the rear end of each main frame 141. A bolt screwed into the motor case 170 is inserted into the outer cylinder 141c. The outer cylinder 141c forms the above-described fastening portion 132 in which the front frame 140 and the motor case 170 are connected to each other. In the illustrated example, the down frame 42 extends to branch off from the lower pipe 141b of the main frame 141.

The front frame 140 includes a pair of left and right first gussets 143 connecting the front of the upper pipe 141a and the front of the lower pipe 141b, an upper gusset 144 connecting the pair of upper pipes 141a, and a lower pipe 141b. A pair of left and right side second gussets 145 for connecting the lower frame 141 and the down frame 42, and a pair of left and right lower gussets 146 for reinforcing the branch portion between the lower pipe 141b and the down frame 42 are further provided.

The pair of first side gussets 143 are each formed in a plate shape and are welded to the upper pipe 141a and the lower pipe 141b. The first side gusset 143 extends in the up-down direction and connects outer side surfaces of the upper pipe 141a and the lower pipe 141b in the vehicle width direction. The front edge of the first side gusset 143 is connected to the head pipe 31. The rear edge of the first side gusset 143 linearly extends vertically in front of the battery case 160 in a side view (see FIG. 5).

The upper gusset 144 is formed in a plate shape and is welded to the pair of upper pipes 141a. The upper gusset 144 extends in the left-right direction and connects the upper surfaces of the pair of upper pipes 141a. The rear edge of the upper gusset 144 extends linearly in the vehicle width direction when viewed from above and below.

The pair of side second gussets 145 are each formed in a plate shape and are welded to the lower pipe 141b and the down frame 42. The second side gusset 145 extends in the up-down direction, and connects the lower pipe 141b and the outer side surface of the down frame 42 in the vehicle width direction. The first side gusset 143 is connected to the lower pipe 141b and the down frame 42 from the branch portion of the lower pipe 141b and the down frame 42 to the rear thereof. The rear edge of the second side gusset 145 extends vertically in front of the battery case 160 in a side view (see FIG. 5).

The pair of lower gussets 146 are welded to the lower pipe 141b and the down frame 42. The pair of lower gussets 146 are provided so as to cover a branch portion between the lower pipe 141b and the down frame 42 from below.

The shape of the first side gusset 143 is not limited to the illustrated shape. For example, the rear edge of the first side gusset may cross the front surface of the battery case 160 in a side view, or the rear edge of the first side gusset may be located forward of the second side gusset 145 in a side view. It may be provided. The same applies to the shapes of the upper gusset 144, the second side gusset 145, and the lower gusset 146.

バ ッ テ リ As shown in FIG. 5, the battery case 160 is disposed between the pair of main frames 141, and protrudes above the main frames 141. The battery case 160 includes a first rear fastening seat 163 instead of the first rear fastening seat 63, the second rear fastening seat 64, the first rib 65, and the second rib 66 of the first embodiment. A second rear fastening seat 164, a first rib 165, and a second rib 166 are formed. The first front fastening seat 61 of the first embodiment is not formed on the battery case 160 of the second embodiment.

A pair of first rear fastening seats 163 are provided at the rear of the battery case 160 on the left and right sides. The pair of first rear fastening seats 163 are provided slightly below the second front fastening seat 62 (see FIG. 2), for example. The pair of first rear fastening seats 163 project rearward from both left and right sides of the rear surface of the battery case 160. The pair of first rear fastening seats 163 are fastened to the motor case 170. The first rear fastening seat 163 forms the above-described upper fastening portion 134 in which the battery case 160 and the motor case 170 are connected to each other.

一 対 A pair of left and right second rear fastening seats 164 are provided at the lower rear portion of the battery case 160. The pair of second rear fastening seats 164 are provided below the second front fastening seat 62. The pair of second rear fastening seats 164 project rearward from both left and right sides of the rear surface of the battery case 160. The pair of second rear fastening seats 164 are fastened to the second front connection piece 72 of the motor case 170. The second rear fastening seat 164 forms the above-described lower fastening portion 135 in which the battery case 160 and the motor case 170 are connected to each other.

The first rib 165 and the second rib 166 are provided on both left and right sides of the battery case 160, respectively. The first rib 165 and the second rib 166 project outward from the side surface of the battery case 160 in the vehicle width direction. The first rib 165 extends so as to connect the second front fastening seat 62 and the first rear fastening seat 163 in a side view. The second rib 166 extends so as to connect the second front fastening seat 62 and the second rear fastening seat 164 in a side view.

Instead of the first front connection piece 71 of the first embodiment, a front first connection piece 171 and a front third connection piece 177 are formed in the motor case 170.

A pair of left and right front first connection pieces 171 are provided in the upper front part of the motor case 170. The pair of front first connection pieces 171 are formed so as to protrude forward and upward. The left front first connection piece 171 is fastened to the outer cylinder 141c of the left main frame 141. The right front first connection piece 171 is fastened to the outer cylinder 141c of the right main frame 141. The front first connection piece 171 forms a fastening portion 132 between the motor case 170 and the front frame 140 described above.

A pair of left and right front third connection pieces 177 are provided at the front of the motor case 170. The pair of front third connection pieces 177 is provided below the front first connection piece 171 and above the front second connection piece 172. The pair of front third connection pieces 177 are formed so as to protrude forward. The front third connection piece 177 on the left side is fastened to the first rear fastening seat 163 on the left side of the battery case 160. The right front third connection piece 177 is fastened to the right first rear fastening seat 163 of the battery case 160. The front third connection piece 177 forms the above-described upper fastening portion 134 in which the battery case 160 and the motor case 170 are connected to each other.

Here, the position of each fastening portion in the body frame 130 of the second embodiment will be described in detail.
As shown in FIG. 5, the lower fastening portion 33 between the front frame 140 and the battery case 160 is lower than a second straight line L2 connecting the lower end of the head pipe 31 and the center point of the axle of the rear wheel 3 in a side view. It is provided in. That is, the front frame 140 and the battery case 160 are connected to each other only below the second straight line L2 in a side view.

As described above, in the vehicle body frame structure of the present embodiment, the battery case 160 fastened to the front frame 140 and the motor case 170 connected to the battery case 160 and the rear frame 50 are formed as the body frame 30. Used. According to this configuration, similarly to the first embodiment, the number of members used for the body frame 130 can be reduced as compared with the related art. Thus, the weight of the entire vehicle can be reduced.

The front frame 140 and the battery case 160 are connected to each other only below a second straight line L2 connecting the lower end of the head pipe 31 and the center point of the axle of the rear wheel 3 in a side view. According to this configuration, as compared with a configuration in which the front frame and the battery case are connected to each other above the second straight line L2, the fastening portion between the front frame 140 and the battery case 160 concentrates downward. Be placed. Therefore, the upper portion of the battery case 160 is easily displaced in the vehicle width direction with respect to the front frame 140, and the torsion center of the vehicle body is lowered. Therefore, the steering stability of the motorcycle 1 can be improved.

In the present embodiment, the second front fastening seat 62 of the battery case 160 is provided slightly above the first rear fastening seat 163. As a result, the connection portion (lower fastening portion 33) between front frame 140 and battery case 160 is provided above upper fastening portion 134 located at the highest position among the connection portions between battery case 160 and motor case 170. ing. However, the present invention is not limited to this, and the second front fastening seat of the battery case may be provided at the same height as the first rear fastening seat 163 or below the first rear fastening seat 163. Thus, the upper part of the battery case is easily displaced in the vehicle width direction, so that the torsion center of the vehicle body can be lowered. Therefore, the steering stability of the motorcycle 1 can be further improved.

Note that the present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope.
For example, in the above embodiment, the battery cases 60 and 160 and the motor cases 70 and 170 are formed of aluminum or an aluminum alloy. However, the invention is not limited thereto, and at least one of the battery case and the motor case may be formed of, for example, a steel material.

In addition, in the above-described embodiment, the components of the body frames 30 and 130 are connected by fastening. However, the method of connecting the components of the body frame is not limited to fastening, but may be welding, for example.

Further, in the above-described embodiment, the rear frame 50 is connected to the motor cases 70 and 170, but the rear frame 50 may be further connected to the battery cases 60 and 160.
In the above embodiment, the swing arm 9 is supported by the motor case 70. However, the present invention is not limited to this, and the swing arm may be supported by the rear frame.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined.

2 Front wheel 3 Rear wheel 7 Power control unit 9 Swing arm 13 Rear cushion 15 Seat 30, 130 Body frame 31 Head pipe 32 Upper fastening part (first connection part)
33 Lower fastening part (second connection part)
40, 140 Front frame 42 Down frame 50 Rear frame 60, 160 Battery case 70, 170 Motor case 73 First rear connection piece (connection piece)
141 Main frame L1 First straight line L2 Second straight line L3 Third straight line

Claims (11)

1. A head pipe (31) for supporting the front wheel (2) in a steerable manner;
   A front frame (40, 140) extending rearward of the vehicle from the head pipe (31);
   A rear frame (50) for supporting the seat (15);
   A battery case (60, 160) formed so as to be capable of accommodating a battery, disposed behind the head pipe (31), and connected to the front frame (40, 140);
   A motor case (70, 170) housing a motor driven by the power of the battery and connected to the battery case (60, 160) and the rear frame (50);
   With
   The battery case (60, 160) and the motor case (70, 170) are used as a body frame (30, 130).
   Body frame structure of saddle-ride type electric vehicle.
2. The front frame (40) and the battery case (60) include a first connection part (32) and a second connection part (33) provided below the first connection part (32). Connected to each other,
   The vehicle body frame structure of the saddle-ride type electric vehicle according to claim 1.
3. At least one of the motor case (70) and the rear frame (50) supports a swing arm (9) rotatably supporting a rear wheel (3) so as to be vertically swingable,
   The battery case (60) and the motor case (70) are above and below a first straight line (L1) connecting the lower end of the head pipe (31) and the swing center of the swing arm (9) in a side view. Connected to each other at
   A vehicle body frame structure for a saddle-ride type electric vehicle according to claim 2.
4. The battery case (60) and the motor case (70) are above and below a second straight line (L2) connecting the lower end of the head pipe (31) and the center point of the axle of the rear wheel (3) in side view. Connected to each other at
   A vehicle body frame structure for a saddle-ride type electric vehicle according to claim 2 or 3.
5. A connecting portion (34) between the battery case (60) and the motor case (70) and a connecting portion (32) between the front frame (40) and the battery case (60) are rear wheels in a side view. (3) provided on a third straight line (L3) passing through the center of the axle;
   The vehicle body frame structure for a saddle-ride type electric vehicle according to any one of claims 2 to 4.
6. The front frame (140)
   A main frame (141) extending rearward from the head pipe (31) through the vehicle width direction outside of the battery case (160) and connected to the motor case (170);
   A down frame (42) extending below the main frame (141) from the head pipe (31) and connected to the battery case (160);
   Comprising,
   The vehicle body frame structure of the saddle-ride type electric vehicle according to claim 1.
7. The motor case (70, 170) includes a connecting piece (73) connected to the rear frame (50),
   A rear cushion (13) is connected to the connection piece (73).
   A vehicle body frame structure for a saddle-ride type electric vehicle according to any one of claims 1 to 6.
8. The battery case (60, 160) and the motor case (70, 170) are formed of aluminum or an aluminum alloy,
   The motor case (70, 170) is formed thicker than the battery case (60, 160).
   A vehicle body frame structure for a saddle-ride type electric vehicle according to any one of claims 1 to 7.
9. The front frame (140) and the battery case (160) are only below the second straight line (L2) connecting the lower end of the head pipe (31) and the center point of the axle of the rear wheel (3) in side view. Connected to each other at
   A vehicle body frame structure for a saddle-ride type electric vehicle according to any one of claims 1 to 8.
10. The battery case (60, 160) is formed to be larger in the vehicle vertical direction than in the vehicle front-rear direction in side view.
    The vehicle body frame structure of a saddle-ride type electric vehicle according to any one of claims 1 to 9.
11. The upper end of the motor case (70, 170) is provided below the upper end of the battery case (60, 160),
    A power control unit (7) for controlling the motor is disposed above the motor case (70, 170).
    A vehicle body frame structure for a saddle-ride type electric vehicle according to any one of claims 1 to 10.

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