WO2022209100A1

WO2022209100A1 - Saddle-riding type vehicle

Info

Publication number: WO2022209100A1
Application number: PCT/JP2021/048968
Authority: WO
Inventors: 良行佐藤; 徹上坂; 謙二郎岩崎; 洋平作間
Original assignee: 本田技研工業株式会社
Priority date: 2021-03-30
Filing date: 2021-12-28
Publication date: 2022-10-06
Also published as: JPWO2022209100A1

Abstract

This saddle-riding type vehicle comprises a vehicle body frame formed by joining split bodies, wherein components can be easily arranged near the vehicle body frame.　The saddle-riding type vehicle comprises a vehicle body frame (10). The vehicle body frame (10) is formed to be hollow by joining a left-side member (51) extending in the up-down direction, a right-side member (52) extending in the up-down direction, and a lower member (53) extending in the left-right direction below the left-side member (51) and the right-side member (52). An upper end section (51b) of the left-side member (51) and an upper end section (52d) of the right-side member (52) are joined to each other at the upper face of the vehicle body frame (10); a left end section (55b) of the lower member (53) is joined to a lower end section (51c) of the left-side member (51); and a right end section (55c) of the lower member (53) is joined to a lower end section (52c) of the right-side member.

Description

saddle-riding vehicle

The present invention relates to a saddle-ride type vehicle.

Conventionally, there is known a saddle-ride type vehicle in which a hollow vehicle body frame is formed by joining a pair of split bodies that are split left and right (see, for example, Patent Document 1). By dividing the body frame in this manner, the body frame can be easily manufactured. In Patent Literature 1, the joint portion between the divided bodies is provided at the center portion in the width direction of the vehicle body frame.

JP 2004-262254 A

However, as in the above-described conventional saddle-riding type vehicle, when the left and right split bodies are joined together, the joining portion located at the center in the width direction of the vehicle body frame interferes with the arrangement of the parts. Sometimes. Also, a structure is conceivable in which the body frame is formed by joining two vertically divided bodies. In this case, the connecting portion between the divided bodies is positioned on the side surface of the vehicle body frame, making it difficult to arrange parts on this side surface.
SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to facilitate the arrangement of parts near the body frame in a saddle-ride type vehicle having a body frame formed by joining divided bodies. do.

This specification includes all the contents of Japanese Patent Application/Japanese Patent Application No. 2021-058043 filed on March 30, 2021.
A saddle-ride type vehicle is a saddle-ride type vehicle including a body frame, wherein the body frame includes a left member extending in the vertical direction, a right member extending in the vertical direction, and laterally extending below the left member and the right member. An upper end portion of the left side member and an upper end portion of the right side member are joined to each other on the upper surface of the vehicle body frame, and a left end portion of the lower member is: The right end of the lower member is joined to the lower end of the left member, and the right end of the lower member is joined to the lower end of the right member.

Further, in the above-described configuration, the left joint portion that joins the left end portion and the lower end portion of the left side member, and the right joint portion that joins the right end portion and the lower end portion of the right side member, may be connected to the vehicle body. It may be located on the bottom surface of the frame.
Further, in the above-described configuration, a center portion in the left-right direction of the lower member may project upward with respect to the left end portion and the right end portion, and at least a portion of the center portion may be a flat surface.

Further, in the above-described configuration, parts are arranged along the central part below the central part, and when viewed from the side of the vehicle, at least a part of the parts are arranged by the vehicle body frame on the side of the central part. It may be covered from the outside in the width direction.
Further, in the above-described configuration, at the rear portion of the vehicle, the left joint portion and the right joint portion are protrusions that protrude downward, and the rear fender located above the rear wheel is a plate-like portion that covers the rear wheel from above. and a pair of left and right engaging portions protruding downward from the left and right ends of the plate-shaped portion, and the groove provided on the upper surface of the engaging portion engages the projecting portion from below. good.

The straddle-type vehicle includes a vehicle body frame that joins a vertically extending left member, a vertically extending right member, and a horizontally extending lower member below the left and right members. The upper end of the left member and the upper end of the right member are joined to each other on the upper surface of the vehicle body frame, the left end of the lower member is joined to the lower end of the left member, and the lower member is joined to the lower end of the right member.
According to this configuration, the left end of the lower member is joined to the lower end of the left member, and the right end of the lower member is joined to the lower end of the right member. No joints are provided. Therefore, it is easy to arrange the parts near the central portion of the lower member. Also, since it is not necessary to provide joints on the side surface of the left member and the side surface of the right member, it is easy to arrange the parts near the left member and the right member.

Further, in the above-described configuration, the left joint portion that joins the left end portion and the lower end portion of the left member, and the right joint portion that joins the right end portion and the lower end portion of the right member are located on the lower surface of the vehicle body frame. Also good.
According to this configuration, since the left joint and the right joint are positioned on the lower surface of the vehicle body frame, the left joint and the right joint are less noticeable on the side of the vehicle. Therefore, the appearance of the saddle-ride type vehicle is good.
Further, in the above configuration, the left and right center portions of the lower member may protrude upward with respect to the left end portion and the right end portion, and at least a portion of the center portion may be a flat surface.
According to this configuration, since the central portion of the lower member protrudes upward, the rigidity of the lower member increases, and the rigidity of the vehicle body frame can be improved. Moreover, since at least a part of the central portion is a flat surface, it is easy to arrange components in the central portion. In addition, since the position of the central portion is high, when arranging the parts inside the body frame, it is easy to arrange the parts in the central portion from above.

Furthermore, in the above-described configuration, the parts are arranged along the central part below the central part, and when viewed from the side of the vehicle, at least part of the parts are covered from the outside in the vehicle width direction by the body frame on the side of the central part. It's okay to be broken.
According to this configuration, the parts can be protected using the vehicle body frame. In addition, the parts can be hidden from the sides by using the body frame, and the appearance of the saddle-ride type vehicle is good.
Further, in the above-described configuration, at the rear portion of the vehicle, the left joint portion and the right joint portion are projecting portions projecting downward, and the rear fender positioned above the rear wheels includes a plate-like portion that covers the rear wheels from above, A pair of right and left engaging portions protruding downward from the left and right ends of the plate-like portion may be provided, and a groove provided on the upper surface of the engaging portion may engage with the protruding portion from below.
According to this configuration, it is possible to secure a large distance between the rear wheel and the plate-like portion of the rear fender between the left and right engaging portions, and the projecting portion formed by the left joint portion and the right joint portion can be used to You can fix the rear fender.

FIG. 1 is a left side view of a motorcycle according to an embodiment of the invention. FIG. 2 is a left side view of the vehicle body frame. FIG. 3 is a plan view of the vehicle body frame viewed from above. FIG. 4 is a perspective view of the vehicle body frame viewed from the lower left side. FIG. 5 is a cross-sectional view taken along line VV of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a perspective view of the rear fender attached to the seat frame as viewed from below.

An embodiment of the present invention will be described below with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

FIG. 1 is a left side view of a motorcycle 1 according to an embodiment of the invention.
The motorcycle 1 includes a body frame 10, an engine 11 supported by the body frame 10, a front fork 12 supporting a front wheel 2 in a steerable manner, a swing arm 13 supporting a rear wheel 3, and a seat 14 for an occupant. and a vehicle.
The motorcycle 1 is a saddle-riding type vehicle in which a rider straddles a seat 14 and sits thereon. The seat 14 is provided above the rear portion of the vehicle body frame 10 .

2 is a left side view of the body frame 10. FIG.
1 and 2, the body frame 10 includes a head pipe 15 provided at the front end of the body frame 10, a main frame 16 extending rearward from the head pipe 15 to the rear portion of the motorcycle 1, and a main frame 16. a pivot frame 17 extending downwardly from the rear of the .

The main frame 16 includes a hollow main tube 18 extending rearward from the head pipe 15 and a seat frame portion 19 extending rearward from the rear end of the main tube 18 .
The seat frame portion 19 has a vertical length greater than that of the main tube 18 and bulges downward with respect to the main tube 18 .
The pivot frame 17 extends downward from the lower end of the seat frame portion 19 . The seat 14 is supported by the seat frame portion 19 . The seat 14 covers the upper surface of the seat frame portion 19 from above.

The front fork 12 is supported so as to be steerable left and right via a steering shaft (not shown) inserted through the head pipe 15 . The front wheel 2 is supported by an axle 2 a provided at the lower end of the front fork 12 .
A steering handle 21 is attached to the upper end of the front fork 12 .

The swing arm 13 is supported by a pivot shaft 22 supported by the pivot frame 17 . The pivot shaft 22 is a shaft extending horizontally in the vehicle width direction (horizontal direction). A pivot shaft 22 is inserted through the front end of the swing arm 13 . The swing arm 13 swings up and down around the pivot shaft 22 .
The rear wheel 3 is supported by an axle 3 a provided at the rear end of the swing arm 13 .
A pair of left and right reactions 23 are spanned between the rear portion of the swing arm 13 and the rear portion of the seat frame portion 19 .

The engine 11 is arranged below the main frame 16 behind the front wheels 2 and in front of the pivot frame 17 .
The engine 11 is an internal combustion engine that includes a crankcase 31 that houses a crankshaft 30 that extends in the vehicle width direction, and a cylinder portion 32 that extends forward from the front surface of the crankcase 31 .
The engine 11 is a horizontal engine in which the axis 32a of the cylinder portion 32 extends substantially horizontally in the vehicle front-rear direction when viewed from the side of the vehicle.
A piston (not shown) connected to the crankshaft 30 reciprocates back and forth within the cylinder portion 32 along an axis 32a.

A transmission (not shown) that decelerates and outputs the rotation of the crankshaft 30 is housed in the rear portion of the crankcase 31 . The output shaft of this transmission and the rear wheels 3 are connected by a drive chain 33 .
An exhaust pipe 35 of the engine 11 extends rearward from an exhaust port provided on the lower surface of the cylinder portion 32 . A muffler 36 is connected to the rear end of the exhaust pipe 35 .

An intake device 37 that supplies intake air to the engine 11 includes an air cleaner case 38 , a throttle device 39 connected to the cylinder portion 32 , and a connecting tube 40 that connects the air cleaner case 38 and the throttle device 39 .
The fuel tank 41 is arranged below the air cleaner case 38 .
A battery 42 that supplies electric power to each part of the motorcycle 1 is supported by the air cleaner case 38 .

A step 43 on which an occupant puts his/her foot is supported by the pivot frame 17 via a step holder 44 .
A storage box 45 capable of storing parts and articles is attached to the outer surface of the seat frame portion 19 .
The headlight 46 is arranged in front of the head pipe 15 . The front fender 47 is attached to the front fork 12 .
A rear fender 48 that covers the rear wheel 3 from above is attached to the seat frame portion 19 .

An ABS (Anti-lock Brake System) modulator 25 is arranged in the main tube 18 of the main frame 16 . The ABS modulator 25 is a braking force adjusting device that prevents the front wheels 2 and the rear wheels 3 from locking by controlling the hydraulic pressure of brake devices (not shown) for the front wheels 2 and the rear wheels 3 . The ABS modulator 25 includes a pump that is driven by a motor to adjust the hydraulic pressure, a hydraulic circuit connected to the pump, a valve that switches the hydraulic circuit, and an electronic controller that controls the motor. The ABS modulator 25 has a substantially rectangular box shape.

A main harness 49 of the electrical system extends in the vehicle front-rear direction through below the main tube 18 . The main harness 49 is connected to the battery 42 and supplies power from the battery 42 to each part of the motorcycle 1 .
An electrical component 50 is arranged between the main tube 18 and the engine 11 . The electrical component 50 is, for example, an ignition coil that transforms the power of the battery 42 into a high voltage. This ignition coil is connected to an ignition plug (not shown) of the engine 11 via a plug cord (not shown).

FIG. 3 is a plan view of the vehicle body frame 10 viewed from above. FIG. 4 is a perspective view of the vehicle body frame 10 viewed from the lower left side.
2 to 4, the main frame 16 is formed into a hollow case shape by joining a plurality of plate members (divided bodies) by welding.
Specifically, the main frame 16 includes a left member 51 forming the left side surface of the main frame 16 and a right member 52 forming the right side surface of the main frame 16 .
The left member 51 and the right member 52 are plate members extending in the vertical direction and the front-rear direction, and are arranged with the plate thickness direction directed in the vehicle width direction when viewed as a whole. The left member 51 and the right member 52 are plate members longer in the front-rear direction than in the up-down direction, and constitute the main tube 18 and the seat frame portion 19 .
The left member 51 and the right member 52 are provided substantially symmetrically.

The main frame 16 also includes a lower member 53 forming the lower surface of the main frame 16 and a rear member 54 forming the rear surface of the main frame 16 . The lower member 53 is a plate member arranged with its plate thickness direction oriented in the vertical direction.
Specifically, the lower member 53 includes a first lower member 55 forming the lower surface of the main tube 18 of the main frame 16 and a second lower member 55 forming the lower surface of the seat frame portion 19 of the main frame 16 . and a side member 56 .

The main tube 18 of the main frame 16 joins the upper portion of the left member 51 and the upper portion of the right member 52 to each other, and the lower portion of the left member 51 and the lower portion of the right member 52 are connected by a first lower member 55 in the vehicle width direction. By connecting to , it is formed in a tube shape extending back and forth.
The front end opening of the main tube 18 is closed by the rear surface of the head pipe 15 .

The seat frame portion 19 of the main frame 16 connects the lower edge portion of the rear portion of the left member 51 and the lower edge portion of the rear portion of the right member 52 with a second lower member 56 in the vehicle width direction. A hollow case shape is formed by connecting the rear end portion and the rear end portion of the right side member 52 with the rear side member 54 in the vehicle width direction.
As viewed from the side of the vehicle, the lower edge portion of the rear portion of the left member 51, the lower edge portion of the rear portion of the right member 52, and the second lower member 56 are inclined rearwardly upward.

Most of the upper surface of the seat frame portion 19 is provided with an opening portion 57 that opens upward. The opening 57 extends longer in the vehicle front-rear direction than in the vehicle width direction in plan view. The opening 57 is provided by cutting out the upper portion of the left member 51 and the upper portion of the right member 52 .
Inside the seat frame portion 19, a rear internal space 58 surrounded by the left member 51, the right member 52, the second lower member 56, and the rear member 54 is formed. The rear internal space 58 is exposed upward from the opening 57 .
The left member 51 and the right member 52 are side walls that define the rear internal space 58 in the vehicle width direction. The second lower member 56 is a lower wall that covers the rear internal space 58 from below.

The rear member 54 is a plate member integrally including a rear wall portion 54a that forms the rear surface of the seat frame portion 19 and an upper wall portion 54b that forms the upper surface of the rear end portion of the seat frame portion 19. As shown in FIG.
The rear wall portion 54a connects the rear edge portion of the left member 51 and the rear edge portion of the right member 52 in the vehicle width direction. The upper wall portion 54b connects the upper edge of the rear end portion of the left member 51 and the upper edge of the rear end portion of the right member 52 in the vehicle width direction. The opening 57 is positioned in front of the upper wall portion 54b.

A rear end portion 19a of the seat frame portion 19 is formed in a bag shape with a closed rear surface of the rear end portion 19a. The rear end portion 19 a is positioned behind the opening 57 . The rear end portion 19 a also serves as the rear end portion of the vehicle body frame 10 .
The rear end portion 19 a is composed of the rear end portion of the left member 51 , the rear end portion of the right member 52 , the rear end portion of the second lower member 56 and the rear member 54 .

An engine hanger portion 60 extending downward from the rear end portion of the main tube 18 is provided at the front end portion of the seat frame portion 19 . The engine hanger portion 60 is provided at a lower front end portion of the left member 51 and a lower front end portion of the right member 52, respectively.
An upper portion of the crankcase 31 ( FIG. 1 ) is fastened to the engine hanger portion 60 .

The first lower member 55 integrally includes a lower wall portion 61 forming the lower surface portion of the main tube 18 and a front wall portion 62 extending downward from the rear end of the lower wall portion 61 .
The front wall portion 62 is a wall portion facing the vehicle front side, and connects the front edges of the left and right engine hanger portions 60 to each other in the vehicle width direction.
The front wall portion 62 is provided with an outside air intake port 63 that penetrates the front wall portion 62 in the vehicle front-rear direction. The outside air intake port 63 is an opening provided by cutting the front wall portion 62 upward from the lower edge of the front wall portion 62 . The outside air intake 63 opens toward the front of the vehicle.

A portion of the lower surface of the seat frame portion 19 between the front wall portion 62 and the second lower member 56 in the longitudinal direction of the vehicle is an open portion 64 that opens downward. The open portion 64 exposes the rear internal space 58 downward.

The pivot frame 17 is positioned forward of the second lower member 56 . The pivot frame 17 includes a pair of left and right side wall portions 17a and a wall portion 17b connecting rear edges of the side wall portions 17a in the vehicle width direction.
An upper edge 17d of the left side wall portion 17a of the pivot frame 17 is joined to a lower edge of a left side member 51 of the seat frame portion 19, and an upper edge of the right side wall portion 17a is joined to a right side member 52 of the seat frame portion 19. Joined to the lower edge.
The wall portion 17b is inclined rearwardly upward as viewed from the side of the vehicle. A second lower member 56 forming the lower surface of the seat frame portion 19 extends rearwardly upward continuously from the upper end of the wall portion 17b.
In plan view, the wall portion 17b covers the rear portion of the open portion 64 from below.
The upper and lower portions of the rear portion of the crankcase 31 (FIG. 1) are fastened to the front edge portions of the left and right side wall portions 17a.

Referring to FIG. 1 , the air cleaner case 38 , the fuel tank 41 and the battery 42 are housed in a rear internal space 58 within the seat frame portion 19 and positioned below the opening 57 .
A connecting tube 40 extending forward from the air cleaner case 38 extends forward from the rear internal space 58 through the outside air intake port 63 and is connected to the throttle device 39 .

FIG. 5 is a cross-sectional view taken along line VV of FIG.
The main tube 18 extends in the longitudinal direction of the vehicle in the center portion of the motorcycle 1 in the vehicle width direction. FIG. 5 is a sectional view of the main tube 18 viewed in the axial direction of the main tube 18. As shown in FIG.
1 to 5, the main tube 18 of the main frame 16 includes a vertically extending left member 51, a vertically extending right member 52, and horizontally extending below the left and

right members

51 and 52. A hollow tubular shape is formed by joining the first lower member 55 .

The left member 51 is arranged on the left side with respect to the central portion of the motorcycle 1 in the vehicle width direction, and the right member 52 is arranged on the right side with respect to the central portion of the motorcycle 1 in the vehicle width direction.
The left member 51 is a plate material that integrally includes a left side wall portion 51a extending in the vertical direction and an upper wall portion 51b extending inward in the vehicle width direction from the upper end of the left side wall portion 51a.
The left side wall portion 51a is gently curved as a whole so that the upper and lower intermediate portions of the left side wall portion 51a are located outside the upper end portion and the lower end portion of the left side wall portion 51a in the vehicle width direction.
The upper wall portion 51b is a portion formed by bending the upper portion of the plate member forming the left member 51 inward in the vehicle width direction.

The right side member 52 is a plate material that integrally includes a right side wall portion 52a extending in the vertical direction and an upper wall portion 52b extending inward in the vehicle width direction from the upper end of the right side wall portion 52a.
The right side wall portion 52a is gently curved as a whole so that the upper and lower intermediate portions of the right side wall portion 52a are located outside the upper end portion and the lower end portion of the right side wall portion 52a in the vehicle width direction.
The upper wall portion 52b is a portion formed by bending the upper portion of the plate member forming the right member 52 inward in the vehicle width direction. The right side wall portion 52a and the left side wall portion 51a face each other.

The first lower member 55 is a plate member extending in the left-right direction when viewed in the axial direction of the main tube 18 .
The first lower member 55 is arranged such that the center portion 55a in the left-right direction of the first lower member 55 protrudes upward from the left end portion 55b and the right end portion 55c of the first lower member 55. The whole is gently curved.

At least a portion of the central portion 55 a is a flat surface 70 when viewed in the axial direction of the main tube 18 . The flat surface 70 is substantially horizontal. The flat surface 70 is also flat in a predetermined range in the axial direction of the main tube 18 .
Specifically, when viewed in the axial direction of the main tube 18, the first lower member 55 includes a central portion 55a, a left slanted portion 55d extending left downward from the central portion 55a, and an outer end of the left slanted portion 55d. and an upwardly extending portion 55e extending upwardly from the . The upwardly extending portion 55e is provided at the left end portion 55b.
The first lower member 55 includes a right slanted portion 55f extending downward and to the right from the central portion 55a, and an upper sloping portion 55f extending upward from the outer end of the right slanted portion 55f when viewed in the axial direction of the main tube 18. and an extension portion 55g. The upward extending portion 55g is provided at the right end portion 55c.
The upwardly extending portions 55e and 55g are portions formed by bending upward the outer end portions of the plate material that constitutes the first lower member 55. As shown in FIG. The upwardly extending portions 55e and 55g are positioned lower than the central portion 55a.

A left end portion 55b of the first lower member 55 is joined to a lower end portion 51c of the left side wall portion 51a.
Specifically, the left end portion 55b is welded to the left side wall portion 51a at a left joint portion 71 where the upper end portion of the upwardly extending portion 55e and the inner surface of the lower end portion 51c in the vehicle width direction meet. At the left joint portion 71, a weld bead 71a along the lower edge of the lower end portion 51c welds the lower edge of the lower end portion 51c to the outer surface of the upwardly extending portion 55e.

A right end portion 55c of the first lower member 55 is joined to a lower end portion 52c of the right side wall portion 52a.
Specifically, the right end portion 55c is welded to the right side wall portion 52a at a right joint portion 72 where the upper end portion of the upwardly extending portion 55g and the inner surface of the lower end portion 52c in the vehicle width direction meet. At the right joint portion 72, a weld bead 72a along the lower edge of the lower end portion 52c welds the lower edge of the lower end portion 52c to the outer surface of the upwardly extending portion 55g.

The left joint portion 71 and the weld bead 71 a and the right joint portion 72 and the weld bead 72 a are located on the lower surface of the main tube 18 . Therefore, the left joint portion 71 and the weld bead 71a and the right joint portion 72 and the weld bead 72a are less conspicuous, and the appearance of the motorcycle 1 is improved.

The upper end portion 51d of the left member 51 is the inner end portion of the upper wall portion 51b in the vehicle width direction.
The upper end portion 52d of the right member 52 is the inner end portion of the upper wall portion 52b in the vehicle width direction.
The left member 51 and the right member 52 are joined to each other on the upper surface of the main tube 18 at the upper end 51d and the upper end 52d.
Specifically, the upper end portion 51d and the upper end portion 52d are welded to each other at an upper surface welding portion 73 where the upper end portion 51d and the upper end portion 52d overlap each other and contact each other. The upper surface welded portion 73 extends linearly on the upper surface of the main tube 18 in the axial direction of the main tube 18 . The upper surface welded portion 73 is located in the central portion in the vehicle width direction.

A front internal space 74 surrounded by the left member 51 , the right member 52 and the first lower member 55 is formed in the main tube 18 .
As viewed in the axial direction of the main tube 18, the front internal space 74 is sandwiched between the left and

right side walls

51a and 52a, and is vertically sandwiched between the upper ends 51d and 52d and the first lower member 55. It is a substantially rectangular space.

A plurality of components are arranged in the front internal space 74 . In the cross-section of FIG. 5, the component ABS modulator 25 is arranged in the front interior space 74 .
A stay 75 is attached to the upper surface of the central portion 55 a of the first lower member 55 in the front internal space 74 . The stay 75 has a plate shape along the upper surface of the first lower member 55 .
The ABS modulator 25 is attached to the upper surface of the stay 75 and supported by the first lower member 55 via the stay 75 . The stay 75 and the ABS modulator 25 are located directly above the central portion 55a.
A central portion 55 a of the first lower member 55 has a flat surface 70 . Therefore, it is easier to dispose the stay 75 and the ABS modulator 25 in the central portion 55a compared to the structure in which the central portion 55a is provided with unevenness.

The stay 75 and ABS modulator 25 are positioned at the rear of the main tube 18 and close to the opening 57 on the upper surface of the seat frame portion 19 . Therefore, a worker or the like can access the stay 75 and the ABS modulator 25 through the opening 57 . Since the stay 75 and the ABS modulator 25 are supported by the central portion 55a from which the first lower member 55 protrudes upward, their positions in the front internal space 74 are raised. Therefore, it is easy for a worker or the like to access the stay 75 and the ABS modulator 25 .

The first lower member 55 is welded to the left member 51 and the right member 52 via the left end 55b and right end 55c of the first lower member 55 . Accordingly, there is no welding portion in the central portion 55 a of the first lower member 55 for welding the first lower member 55 to the left member 51 and the right member 52 .
Therefore, the central portion 55a can be flattened, and parts such as the stay 75 and the ABS modulator 25 can be easily arranged near the central portion 55a.

The left member 51 and the right member 52 are joined together by a top weld 73 located on the top surface of the main tube 18, and the bottom ends 51c and 52c are welded to the first bottom member 55. As shown in FIG. As a result, the side surfaces of the left member 51 and the right member 52 do not have welded portions for forming the main tube 18 into a tubular shape. For this reason, when arranging parts near the side surfaces of the left member 51 and the right member 52, the welded portion is prevented from interfering with the arrangement of the parts, making it easier to arrange the parts.
Further, since there is no welded portion for forming the main tube 18 into a tubular shape on the left side wall portion 51a and the right side wall portion 52a, the appearance of the left side wall portion 51a and the right side wall portion 52a is good, and the left side wall portion 51a and the right side wall portion 52a have a high degree of freedom in shape. Therefore, the left side wall portion 51a and the right side wall portion 52a can be gently curved as a whole, and the rigidity of the left side wall portion 51a and the right side wall portion 52a can be increased.

1 and 5, a bracket 76 that supports the electrical component 50 is provided on the lower surface of the first lower member 55 of the main tube 18. As shown in FIG. The bracket 76 is fastened to the central portion 55a of the first lower member 55 by a fastener 76a inserted vertically. The central portion 55 a has a flat surface 70 . Therefore, it is easier to arrange the bracket 76 in the central portion 55a than in a structure in which the central portion 55a is uneven.

1 and 5, the lower surface of the main tube 18 is formed with an upwardly recessed recess by the central portion 55a of the first lower member 55 protruding upwardly. A portion of the main harness 49 is arranged in this recess. The main harness 49 extends in the axial direction of the main tube 18 along the lower surface of the central portion 55 a of the first lower member 55 of the main tube 18 .
At the rear portion of the main tube 18, the main harness 49 extends along the lower surface of the central portion 55a between the lower portion and left end portion 55b of the left side wall portion 51a and the lower portion and right end portion 55c of the right side wall portion 52a. That is, the main harness 49 is covered from the outside in the vehicle width direction at the rear portion of the main tube 18 by the lower portion and left end portion 55b of the left side wall portion 51a and the lower portion and right end portion 55c of the right side wall portion 52a. Therefore, the main harness 49 is inconspicuous, and the appearance of the motorcycle 1 is good.

FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a perspective view of the rear fender 48 attached to the seat frame portion 19 as seen from below. In FIG. 7, the reaction 23 on the left side is not shown.
In the cross section of FIG. 6 , the rear internal space 58 of the seat frame portion 19 is surrounded from the left and right by the left member 51 and the right member 52 and is surrounded from below by the second lower member 56 .
In the cross section of FIG. 6, the opening 57 on the upper surface of the seat frame portion 19 is closed by a cover 77 that covers the fuel tank 41 from above.

The left side member 51 includes a left side wall portion 51a extending vertically in the seat frame portion 19 portion.
A lower end portion of the left side wall portion 51a in the portion of the seat frame portion 19 is a rear lower end portion 51f. The rear lower end portion 51f protrudes vertically downward.
The rear lower end portion 51f is inclined rearwardly upward when viewed from the side of the vehicle in FIG.

The right side member 52 includes a right side wall portion 52a extending vertically at the seat frame portion 19 portion.
A lower end portion of the right side wall portion 52a in the seat frame portion 19 is a rear lower end portion 52f. The rear lower end portion 52f protrudes vertically downward.

As shown in FIG. 6, the second lower member 56 includes a bottom plate portion 56a extending substantially horizontally in the left-right direction in a cross-sectional view in the vehicle front-rear direction, and a downward extension portion 56b extending downward from the left end of the bottom plate portion 56a ( left end) and a downward extending portion 56c (right end) extending downward from the right end of the bottom plate portion 56a.
The second lower member 56 is arranged so that the bottom plate portion 56a is rearwardly raised when viewed from the side of the vehicle.

The downwardly extending portion 56b of the second lower member 56 is joined to the rear lower end portion 51f of the left side wall portion 51a.
Specifically, the left downward extending portion 56b is welded to the left side wall portion 51a at a rear left joint portion 78 (left joint portion) where the outer surface of the downward extending portion 56b and the inner surface of the rear lower end portion 51f meet. be done.

The downwardly extending portion 56c of the second lower member 56 is joined to the rear lower end portion 52f of the right side wall portion 52a.
Specifically, the right downward extending portion 56c is welded to the right side wall portion 52a at a rear right joint portion 79 (right joint portion) where the outer surface of the downward extending portion 56c and the inner surface of the rear lower end portion 52f meet. be done.
The rear left joint portion 78 and the rear right joint portion 79 are protrusions that protrude downward from the bottom plate portion 56 a of the second lower member 56 and are provided on the lower surface of the seat frame portion 19 .

The rear fender 48 is fastened to the lower surface of the second lower member 56 . The rear fender 48 is a plate member that slopes rearward and upward along the second lower member 56 when viewed from the side of the vehicle.
The rear fender 48 includes a plate-like portion 48a that covers the rear wheel 3 from above, and a pair of left and right engaging

portions

48b and 48c projecting downward from left and right ends of the plate-like portion 48a.
The plate-like portion 48a is provided along the lower surface of the bottom plate portion 56a and covers the bottom plate portion 56a from below.
A groove portion 48d that opens upward is provided on the upper surface of each of the engaging

portions

48b and 48c. The groove portion 48d extends linearly in the front-rear direction in plan view.

When the rear fender 48 is attached to the second lower member 56, the left groove portion 48d engages the rear left joint portion 78 of the seat frame portion 19, and the right groove portion 48d engages the rear right joint portion of the seat frame portion 19. 79.
As a result, the rear fender 48 can be positioned and firmly attached using the rear left joint portion 78 and the rear right joint portion 79 of the seat frame portion 19 .
Further, the plate-like portion 48a of the rear fender 48 bulges upward with respect to the rear left joint portion 78 and the rear right joint portion 79 along the bottom plate portion 56a. Therefore, a large distance can be secured between the plate-like portion 48 a of the rear fender 48 and the rear wheel 3 .
The bottom plate portion 56a of the second lower member 56 does not have a welded portion for joining the second lower member 56 to the left member 51 and the right member 52, and the bottom plate portion 56a is flat. Therefore, parts such as the fuel tank 41 can be easily arranged above the bottom plate portion 56a.

As described above, according to the embodiment to which the present invention is applied, the motorcycle 1 includes the vehicle body frame 10, and the vehicle body frame 10 includes the vertically extending left side member 51 and the vertically extending right side member 52. and a lower member 53 extending in the left-right direction below the left member 51 and the right member 52 are joined together to form a hollow structure, and the upper end 51d of the left member 51 and the upper end 52d of the right member 52 are connected to the vehicle body. The left end 55b of the lower member 53 is joined to the lower end 51c of the left member 51, and the right end 55c of the lower member 53 is joined to the lower end 52c of the right member 52. be.
According to this configuration, the left end 55b of the lower member 53 is joined to the lower end 51c of the left member 51, and the right end 55c of the lower member 53 is joined to the lower end 52c of the right member 52. No joining portion is provided in the left and right central portions 55a of the member 53 . Therefore, parts such as the ABS modulator 25 and the bracket 76 can be easily arranged near the central portion 55 a of the lower member 53 . In addition, since it is not necessary to provide joints on the side surface of the left member 51 and the side surface of the right member 52, it is easy to arrange components near the left member 51 and the right member 52. FIG.

A left joint portion 71 that joins the left end portion 55b and the lower end portion 51c of the left member 51, and a right joint portion 72 that joins the right end portion 55c and the lower end portion 52c of the right member 52 are formed on the lower surface of the vehicle body frame 10. Located in
According to this configuration, since the left joint portion 71 and the right joint portion 72 are positioned on the lower surface of the vehicle body frame 10 , the left joint portion 71 and the right joint portion 72 are less conspicuous on the side of the vehicle. Therefore, the appearance of the motorcycle 1 is good.
A central portion 55 a in the left-right direction of the lower member 53 protrudes upward with respect to the left end portion 55 b and the right end portion 55 c , and at least a portion of the central portion 55 a is a flat surface 70 .
According to this configuration, the central portion 55a of the lower member 53 protrudes upward, so that the rigidity of the lower member 53 is increased, and the rigidity of the vehicle body frame 10 can be improved. Moreover, since at least a portion of the central portion 55a is the flat surface 70, it is easy to arrange components such as the ABS modulator 25 on the central portion 55a. In addition, since the position of the central portion 55a is high, when arranging parts such as the ABS modulator 25 inside the vehicle body frame 10, it is easy to arrange the parts in the central portion 55a from above.

Furthermore, a main harness 49 as a component is arranged below the central portion 55a along the central portion 55a. It is covered from the outside in the vehicle width direction.
According to this configuration, the main harness 49 can be protected using the vehicle body frame 10 . In addition, the main harness 49 can be hidden from the sides by using the body frame 10, and the appearance of the motorcycle 1 is good.
In the rear portion of the motorcycle 1, the rear left joint portion 78 and the rear right joint portion 79 are protrusions that protrude downward, and the rear fender 48 positioned above the rear wheel 3 covers the rear wheel 3 from above. A plate-like portion 48a and a pair of left and right engaging

portions

48b and 48c protruding downward from left and right ends of the plate-like portion 48a. It engages the joint 78 and the rear right joint 79 from below.
According to this configuration, a large distance can be secured between the rear wheel 3 and the plate-like portion 48a of the rear fender 48 between the left and right engaging

portions

48b and 48c, and the rear left joint portion 78 and the rear right joint portion 79 provide a large distance. The rear fender 48 can be fixed using the formed projection.

In addition, the above-described embodiment shows one mode to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
In the above embodiment, the motorcycle 1 has been described as an example, but the present invention is not limited to this, and the present invention is a three-wheel saddle-ride type vehicle having two front wheels or two rear wheels. It is applicable to a saddle type vehicle having four or more wheels.

1 Motorcycle (saddle type vehicle)
3 rear wheel 10 body frame 48 rear fender 48a plate-

like portion

48b, 48c engaging portion 48d groove portion 49 main harness (component)
51 Left member 51c Lower end 51d Upper end 51f Rear lower end (lower end)
52 Right member

52c Lower end

52d Upper end 52f Rear lower end (lower end)
53 lower member 55a center portion 55b left end portion 55c right end portion 56b downward extending portion (left end portion)
56c downward extension (right end)
70 flat surface 71 left joint 72 right joint 78 rear left joint (left joint, protrusion)
79 rear right joint (right joint, protrusion)

Claims

In a straddle-type vehicle comprising a vehicle body frame (10),
The vehicle body frame (10) includes a left member (51) extending in the vertical direction, a right member (52) extending in the vertical direction, and a member extending in the horizontal direction below the left member (51) and the right member (52). It is formed hollow by joining the lower member (53),
the upper end (51d) of the left side member (51) and the upper end (52d) of the right side member (52) are joined together on the upper surface of the vehicle body frame (10);
The left end (55b) of the lower member (53) is joined to the lower end (51c) of the left member (51), and the right end (55c) of the lower member (53) is connected to the right member ( 52) is joined to the lower end (52c) of the straddle-type vehicle.
A left joint (71) joining the left end (55b) and the lower end (51c) of the left member (51), and the right end (55c) and the lower end of the right member (52) 2. The saddle-ride type vehicle according to claim 1, wherein the right joint portion (72) that joins the body frame (52c) is positioned on the lower surface of the vehicle body frame (10).
A center portion (55a) in the left-right direction of the lower member (53) projects upward with respect to the left end portion (55b) and the right end portion (55c), and at least part of the center portion (55a) is Straddle-type vehicle according to claim 1 or 2, characterized in that it is a flat surface (70).
A component (49) is arranged along the central portion (55a) below the central portion (55a), and when viewed from the side of the vehicle, at least a part of the component (49) is positioned above the central portion (55a). The saddle-ride type vehicle according to claim 3, characterized in that it is covered from the outside in the vehicle width direction by the body frame (10) on the side.
At the rear of the vehicle, the left joint (78) and the right joint (79) are projections projecting downward,
A rear fender (48) positioned above the rear wheel (3) includes a plate-like portion (48a) covering the rear wheel (3) from above and a plate-like portion (48a) extending downward from the left and right ends of the plate-like portion (48a). A pair of projecting left and right engaging portions (48b, 48c),
A straddle-type vehicle according to claim 2, wherein grooves (48d) provided on upper surfaces of said engaging portions (48b, 48c) are engaged with said protrusions from below.