WO2022102205A1 - Body frame of saddle-type vehicle - Google Patents

Abstract

This body frame of a saddle-type vehicle is configured to enable efficient improvement in the rigidity of the body frame using a gusset.　The body frame of a saddle-type vehicle comprises a rear frame (19) that extends rearward and upward from a lower frame (18). The rear frame (19) comprises an upward extension (19a) that extends upward from the lower frame (18), and a rearward extension (19b) that extends rearward from an upper section of the upward extension (19a). A gusset (20) is provided to a rear section (60) of the upward extension (19a), and the lower frame (18) comprises an extension (18b) that extends further rearward than a connection (57) between the lower frame (18) and the upward extension (19a). The gusset (20) extends vertically along the rear section (60). A lower end (20a) of the gusset (20) is connected to the extension (18b), and an upper end (20b) of the gusset (20) is connected to the rearward extension (19b).

Description

Body frame of saddle-riding vehicle

The present invention relates to a body frame of a saddle-riding vehicle.

Conventionally, a saddle-riding vehicle having a head pipe, a main frame extending downward from the head pipe, a lower frame extending rearward from the main frame, and a rear frame extending rearward and upward from the lower frame is known (for example,). See Patent Document 1).
In Patent Document 1, the rigidity of the rear frame is improved by providing a reinforcing plate as a gusset on the lower surface of the rear frame.

Japanese Unexamined Patent Publication No. 63-180578

In the body frame of a saddle-riding vehicle, it is desired to efficiently improve the rigidity of the body frame by using a gusset.
The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the rigidity of the body frame of a saddle-riding vehicle to be efficiently improved by using a gusset.

This specification includes all the contents of the Japanese patent application and Japanese Patent Application No. 2020-187414 filed on November 10, 2020.
The body frame of the saddle-riding vehicle includes a head pipe, a main frame extending downward from the head pipe, a lower frame extending rearward from the main frame, and a rear frame extending rearward and upward from the lower frame. The rear frame is provided with an upward extending portion extending upward from the lower frame and a rear extending portion extending rearward from the upper portion of the upward extending portion, and a gusset is provided at the rear portion of the upward extending portion. In the body frame of the type vehicle, the lower frame includes an extension portion extending rearward from the connection portion between the lower frame and the upper extension portion, and the gusset extends up and down along the rear portion, and the gusset The lower end of the gusset is connected to the extension, and the upper end of the gusset is connected to the rear extension.

Further, in the above configuration, the lower frame is a pipe material extending back and forth, and the extension portion may be a portion where the pipe material is extended rearward from the connection portion.
Further, in the above configuration, the lower edge of the lower end portion of the gusset extends back and forth, the gusset has a protrusion protruding downward from the rear end of the lower edge, and the gusset has the lower edge and the said. The protrusion may be welded to the side surface of the extension.

Further, in the above configuration, even if the lower edge is located above the axis of the lower frame in the vehicle side view and the protrusion extends downward to at least the position of the axis in the vehicle side view. good.
Further, in the above configuration, the gusset includes a pair of left and right side walls extending vertically along the rear portion and a rear wall connecting the rear ends of the left and right side walls in the vehicle width direction, and the front edge of the side wall. Is connected to the rear portion, the lower end portion of the gusset is joined to the extension portion via the lower edge of the side wall, and the upper end portion of the gusset is connected to the rear extension portion via the upper edge of the side wall. It may be joined.

Further, in the above configuration, a link member that swingably supports the power unit may be swingably connected to the gusset.
Further, in the above configuration, the gusset may be provided with a stopper portion that comes into contact with the link member and regulates the swing range of the link member.

Further, in the above configuration, a gusset may be provided with a pillion step for passengers.

The body frame of the saddle-type vehicle includes a head pipe, a main frame extending downward from the head pipe, a lower frame extending rearward from the main frame, and a rear frame extending rearward and upward from the lower frame. It has an upward extension extending upward from the lower frame and a rear extension extending rearward from the upper part of the upper extension, and a gusset is provided at the rear of the upper extension, and the lower frame is the lower frame and the upper part. It has an extension that extends posteriorly to the extension, the gusset extends up and down along the rear, the lower end of the gusset is connected to the extension, and the upper end of the gusset is the posterior extension. Connected to.
According to this configuration, the extension portion of the lower frame and the rear extension portion of the rear frame are connected by a gusset provided at the rear portion of the upper extension portion of the rear frame, so that the rigidity of the vehicle body frame is efficiently improved. be able to.

Further, in the above configuration, the lower frame is a pipe material extending back and forth, and the extension portion may be a portion where the pipe material is extended rearward from the connection portion.
According to this configuration, since the extension portion is a portion in which the lower frame, which is a pipe material, is extended rearward from the connection portion, the extension portion can be provided with a simple structure. Therefore, the rigidity of the vehicle body frame can be improved with a simple structure.
Further, in the above configuration, the lower edge of the lower end portion of the gusset extends back and forth, the gusset has a protrusion protruding downward from the rear end of the lower edge, and the gusset has a lower edge and a protrusion portion of the extension portion. Welded to the sides.
According to this configuration, in the gusset, in addition to the lower edge, a protrusion protruding downward from the rear end of the lower edge is welded to the side surface of the extension portion, so that the stress concentration of the welded portion between the gusset and the extension portion is concentrated. Can be effectively mitigated.

Further, in the above configuration, the lower edge may be located above the axis of the lower frame in the side view of the vehicle, and the protrusion may extend downward to at least the position of the axis in the side view of the vehicle.
According to this configuration, since the protrusion extends downward to at least the position of the axis of the lower frame, the protrusion can be provided in a wide range above and below, and stress concentration can be effectively relaxed.
Further, in the above configuration, the gusset includes a pair of left and right side walls extending vertically along the rear portion and a rear wall connecting the rear ends of the left and right side walls in the vehicle width direction, and the lower end portion of the gusset is a side wall. It may be joined to the extension via the lower edge and the upper end of the gusset may be joined to the posterior extension via the upper edge of the side wall.
According to this configuration, since the gusset includes a pair of left and right side walls and a rear wall, the rigidity of the gusset is increased. Therefore, the rigidity of the vehicle body frame can be effectively improved by the gusset.

Further, in the above configuration, a link member that swingably supports the power unit may be swingably connected to the gusset.
According to this configuration, the link member can be connected to the vehicle body frame with a simple structure using a gusset.
Further, in the above configuration, the gusset may be provided with a stopper portion that abuts on the link member and regulates the swing range of the link member.
According to this configuration, a stopper portion that regulates the swing range of the link member can be provided with a simple structure using a gusset.

Further, in the above configuration, a gusset may be provided with a pillion step for passengers.
According to this configuration, a pillion step for passengers can be provided with a simple structure using a gusset.

FIG. 1 is a left side view of a motorcycle according to an embodiment of the present invention. FIG. 2 is a left side view of a motorcycle in a state where the vehicle body cover and the like are removed and the vehicle body frame is exposed. FIG. 3 is a front view of the vehicle body frame as viewed from the front. FIG. 4 is a left side view of a portion of the vehicle body frame provided with a gusset. FIG. 5 is a perspective view of a portion of the vehicle body frame provided with a gusset as viewed from the rear side. FIG. 6 is a left side view of the left gusset. FIG. 7 is a view of the gusset on the left side as viewed from the front side. FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 9 is a view of the link member viewed from the front side.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the explanation, the description of the directions such as front / rear / left / right and up / down is the same as the direction with respect to the vehicle body unless otherwise specified. Further, the reference numeral FR shown in each figure indicates the front of the vehicle body, the reference numeral UP indicates the upper portion of the vehicle body, and the reference numeral LH indicates the left side of the vehicle body.

FIG. 1 is a left side view of the motorcycle 1 according to the embodiment of the present invention.
The motorcycle 1 includes a vehicle body frame 10, a front fork 11 that freely steers the front wheels 2, a power unit 12 supported at the rear of the vehicle body frame 10, a rear wheel 3, and a seat on which an occupant sits. It is a scooter-type saddle-riding vehicle equipped with a 13.
The motorcycle 1 includes a vehicle body cover 14 that covers a vehicle body such as a vehicle body frame 10.

FIG. 2 is a left side view of the motorcycle 1 in a state where the vehicle body cover 14 and the like are removed and the vehicle body frame 10 is exposed. FIG. 3 is a front view of the vehicle body frame 10 as viewed from the front.
The vehicle body frame 10 includes a head pipe 15 provided at the front end portion of the vehicle body frame 10, a front gusset 16 connected to the rear surface of the head pipe 15, and a pair of left and right main frames 17 extending downward from the front gusset 16. Be prepared. The front gusset 16 may be regarded as a part of the main frame 17.
Further, the vehicle body frame 10 includes a pair of left and right lower frames 18 extending rearward from the lower end portion of the main frame 17, and a pair of left and right rear frames 19 extending rearward and upward from the rear end portion of the lower frame 18.
Specifically, each rear frame 19 includes an upward extending portion 19a extending upward from the rear end portion of the lower frame 18, and a rear extending portion 19b extending rearward from the upper portion of the upward extending portion 19a. Both the upward extending portion 19a and the rear extending portion 19b are inclined backward, but the rear extending portion 19b is closer to horizontal than the upward extending portion 19a.
Further, the vehicle body frame 10 includes a gusset 20 provided in the upward extending portion 19a of the rear frame 19.

Further, the vehicle body frame includes a first cross member 21a that connects the left and right main frames 17 in the vehicle width direction (left and right direction) below the front gusset 16 and left and right main frames 17 below the first cross member 21a. The second cross member 21b connected in the vehicle width direction, the third cross member 21c connecting the left and right lower frames 18 in the vehicle width direction, and the fourth cross connecting the front parts of the left and right rear frames 19 in the vehicle width direction. It includes a member 21d and a fifth cross member 21e that connects the rear portions of the left and right rear frames 19 in the vehicle width direction.

The front fork 11 is supported by the head pipe 15 so as to be steerable to the left and right.
The front fork 11 is supported by a steering shaft (not shown) rotatably supported by the head pipe 15, a bridge member 22 fixed to the lower end of the steering shaft, and the bridge member 22 from the bridge member 22. A pair of left and right fork tubes 23 extending downward are provided.
The front wheel 2 is supported by an axle 2a passed between the lower ends of the left and right fork tubes 23.
The steering wheel 24 is attached to the upper end of the front fork 11.

The power unit 12 extends below the rear frame 19 in the front-rear direction of the vehicle.
The power unit 12 is a unit swing engine in which an arm portion 30 that swingably supports the rear wheels 3 and an engine 31 that drives the rear wheels 3 are integrally provided.
The engine 31 is an internal combustion engine. The engine 31 includes a crankcase portion 32 for accommodating a crankshaft (not shown) and a cylinder portion 33 extending forward from the front surface of the crankcase portion 32. A piston (not shown) connected to the crank shaft reciprocates in the cylinder portion 33. The cylinder portion 33 extends from the crankcase portion 32 to the front of the rear frame 19 through between the front portions of the left and right rear frames 19.

The arm portion 30 extends rearward from the side surface portion on one side (left side) in the left-right direction of the crankcase portion 32.
The rear wheel 3 is supported by an axle 3a provided at the rear end of the arm portion 30.
The arm portion 30 is offset to the left with respect to the rear wheel 3 located at the center of the vehicle width. That is, the arm portion 30 extends rearward from the crankcase portion 32 through the left side of the rear wheel 3.

The arm portion 30 is formed hollow. A continuously variable transmission (not shown) using a pulley and a V-belt is housed in the arm portion 30. The driving force of the engine 31 is transmitted to the rear wheels 3 via the continuously variable transmission.
An air cleaner box 35 is attached to the upper surface of the arm portion 30. The outside air taken into the air cleaner box 35 is purified by the air cleaner box 35 and then supplied to the engine 31.

The motorcycle 1 includes a link member 38 (FIG. 2) that swingably connects the power unit 12 to the rear portion of the vehicle body frame 10.
The link member 38 is connected to the gusset 20 of the vehicle body frame 10 via a first swing shaft 39 extending in the vehicle width direction.
Further, the link member 38 is connected to the upper part of the crankcase portion 32 via a second swing shaft 40 extending in the vehicle width direction.
The power unit 12 swings up and down about the first swing shaft 39 and the second swing shaft 40 of the link member 38.
A rear cushion 41 is hung between the rear end portion of the arm portion 30 and the rear end portion of the vehicle body frame 10.

With reference to FIG. 1, the seat 13 is arranged along the rear extension portion 19b of the rear frame 19 and is supported from below by the rear extension portion 19b.
The step floor 42 on which the driver seated on the front portion of the seat 13 rests is located on the lower front side of the seat 13 and is supported from below by the lower frame 18.
The passenger sits at the rear of the seat 13. A pair of left and right pillion steps 43 on which the passenger rests his / her feet are provided on the gusset 20.

The vehicle body cover 14 includes an upper cover 44 that covers the handle 24, a front cover 45 that covers the front portion of the vehicle body frame 10 such as the head pipe 15 from the front, and an inner that covers the front portion of the vehicle body frame 10 such as the head pipe 15 from the rear. A cover 46, a lower cover 47 that covers the lower frame 18 from the side, and a rear side cover 48 that covers the vehicle body below the seat 13 from the side are provided.
The front fender 49 is attached to the front fork 11.

With reference to FIG. 2, the left main frame 17 and the left lower frame 18 are integrally formed by bending one continuous pipe member 25 at the intermediate portion in the longitudinal direction. That is, the main frame 17 on the left side and the lower frame 18 on the left side are made of one pipe material 25.
Similarly, the main frame 17 on the right side and the lower frame 18 on the right side are made of one pipe material 25. Since the main frame 17 and the lower frame 18 are paired on the left and right, two pipe members 25 are provided.
The pipe material 25 has a circular cross section.
The lower frame 18 extends linearly back and forth in a slightly raised posture when viewed from the side of the vehicle. The axis 18a of the lower frame 18 extends back and forth in a slightly raised posture.

FIG. 4 is a left side view of a portion of the vehicle body frame 10 where the gusset 20 is provided. FIG. 5 is a perspective view of a portion of the vehicle body frame 10 provided with the gusset 20 as viewed from the rear side. In FIGS. 4 and 5, the link member 38 is also shown.
With reference to FIGS. 2, 4, and 5, each of the left and right rear frames 19 is formed by bending one continuous pipe member 50 at an intermediate portion in the longitudinal direction. That is, by bending one pipe material 50, the upward extending portion 19a and the rear extending portion 19b are formed.
The pipe material 50 of the rear frame 19 has a circular cross section. The wall thickness of the pipe material 50 constituting the rear frame 19 is smaller than the wall thickness of the pipe material constituting the main frame 17 and the lower frame 18.

The upward extending portion 19a of the rear frame 19 extends rearward and upward from the rear end portion of the lower frame 18 in a posture closer to vertical than horizontal.
The lower end portion 51 of the upward extending portion 19a is bent forward along the upper surface of the lower frame 18.
Further, the lower end portion 51 has a semicircular shape formed so as to cut out the lower half portion of the pipe material 50 in the portion of the lower end portion 51 in the axial direction of the lower end portion 51.

The lower edges 51a and 51b of the lower end portion 51 extend back and forth along the axis 18a of the lower frame 18 when viewed from the side of the vehicle. The lower edges 51a and 51b are the lower edges of the semicircular portion, and are provided in pairs separated from each other in the vehicle width direction.
The lower edges 51a and 51b are located above the axis 18a of the lower frame 18 in the side view of the vehicle. That is, the lower edges 51a and 51b are connected to the upper part of the lower frame 18.
The upper extending portion 19a is joined to the lower frame 18 by a weld bead 52 extending back and forth along the lower edges 51a and 51b.
Specifically, one lower edge 51a is joined to the outer side surface of the upper portion of the lower frame 18 in the vehicle width direction, and the other lower edge 51b is joined to the inner surface of the upper portion of the lower frame 18 in the vehicle width direction. ..

The rear extending portion 19b of the rear frame 19 extends rearward from the upper end of the upward extending portion 19a in a posture closer to horizontal than vertical.
The rear extending portion 19b includes a bent portion 55 that bends backward in an arc shape from the upper end of the upward extending portion 19a, and a main body portion 56 that extends rearward and upward from the rear end of the bent portion 55.

The lower end portion 51 of the upward extending portion 19a is a connecting portion 57 connecting the lower frame 18 and the upward extending portion 19a.
The lower frame 18 includes an extension portion 18b extending rearward from the connection portion 57.
The extension portion 18b is a portion in which the pipe material 25 constituting the lower frame 18 is directly extended rearward from the connection portion 57.

The gusset 20 is provided at the rear portion 60 of each of the left and right upward extending portions 19a.
The gusset 20 extends up and down along the rear 60 in a backward tilted position. The lower end 20a of the gusset 20 is connected to the extension 18b of the lower frame 18. The upper end portion 20b of the gusset 20 is connected to the rear extension portion 19b of the rear frame 19.
That is, the gusset 20 connects the extension portion 18b and the rear extension portion 19b up and down.

FIG. 6 is a left side view of the left gusset 20. FIG. 7 is a view of the gusset 20 on the left side as viewed from the front side. FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. Since the left and right gussets 20 are substantially symmetrical, the left gusset 20 will be mainly described here.
With reference to FIGS. 4 to 8, the gusset 20 connects a pair of left and right side walls 61, 62 extending vertically along the rear portion 60 of the upward extending portion 19a, and the rear ends of the side walls 61, 62 in the vehicle width direction. It is provided with a rear wall 63.

The side wall 61 is a side wall on the outer side in the vehicle width direction, and is arranged so that the plate thickness direction is directed in the vehicle width direction.
The side wall 62 is a side wall on the inner side in the vehicle width direction, and is arranged on the inner side in the vehicle width direction with respect to the side wall 61 so as to face the side wall 61.
The leading edge 61a of the side wall 61 and the leading edge 62a of the side wall 62 extend up and down in a posture tilted backward along the axis 19a1 of the upward extending portion 19a in a vehicle side view.
The side wall 61 is joined to the outer surface of the rear portion 60 in the vehicle width direction by a weld bead 64 along the leading edge 61a.
The side wall 62 is joined to the inner surface of the rear portion 60 in the vehicle width direction by a weld bead 65 (FIG. 5) along the leading edge 62a.

The rear wall 63 covers the rear portion 60 of the upward extending portion 19a from the rear. The rear wall 63 extends vertically between the extension portion 18b and the rear extension portion 19b. The rear wall 63 extends up and down in a posture tilted backward along the axis 19a1 of the upward extending portion 19a when viewed from the side of the vehicle.
Specifically, the rear wall 63 includes an upper rear wall 68 provided above the gusset 20 and a lower rear wall 69 provided below the upper rear wall 68.
The rear wall 63 is provided with an opening 70 that opens rearward between the upper rear wall 68 and the lower rear wall 69.
The upper rear wall 68 includes an upper cutout portion 68a in which the upper portion of the upper rear wall 68 is cut out along the lower surface of the rear extending portion 19b.
The lower rear wall 69 includes a lower notch portion 69a in which the lower portion of the lower rear wall 69 is cut out along the upper surface of the extension portion 18b.

The side wall 61 and the side wall 62 extend vertically between the extension portion 18b and the rear extension portion 19b.
The upper edge 61b of the side wall 61 and the upper edge 62b of the side wall 62 extend rearward and upward along the axis 19b1 of the rear extending portion 19b in the vehicle side view.
The upper edge 61b of the side wall 61 is joined to the lower surface portion of the bent portion 55 and the lower surface portion of the main body portion 56 by a weld bead 71 along the upper edge 61b.
The upper edge 62b of the side wall 62 is joined to the lower surface portion of the bent portion 55 and the lower surface portion of the main body portion 56 by a weld bead 72 (FIG. 5) along the upper edge 62b.
That is, the upper end portion 20b of the gusset 20 is joined to the lower surface portion of the front end portion of the rear extending portion 19b via the upper edge 61b and the upper edge 62b.

The lower edge 61c of the side wall 61 and the lower edge 62c of the side wall 62 (FIG. 5) extend back and forth along the axis 18a of the lower frame 18 in the vehicle side view. The lower edge 61c and the lower edge 62c are located above the axis 18a of the lower frame 18 in the side view of the vehicle. The lower edge 61c and the lower edge 62c are the lower edges of the lower end portion 20a of the gusset 20.
Further, the side wall 61 includes a protrusion 61d that protrudes downward from the rear end of the lower edge 61c. The protruding portion 61d is tilted backward along the axis 19a1 of the upward extending portion 19a when viewed from the side of the vehicle.
The protrusion 61d extends from the lower edge 61c to a position below the axis 18a across the axis 18a of the lower frame 18 when viewed from the side of the vehicle. The protrusion 61d extends downward to at least the position of the axis 18a when viewed from the side of the vehicle.

The side wall 62 includes a protrusion 62d that projects downward from the rear end of the lower edge 62c. The protrusion 62d is tilted backward along the axis 19a1 of the upward extending portion 19a when viewed from the side of the vehicle.
The protrusion 62d extends from the lower edge 62c to a position below the axis 18a across the axis 18a of the lower frame 18 when viewed from the side of the vehicle. The protrusion 62d extends downward to at least the position of the axis 18a when viewed from the side of the vehicle.

The side wall 61 is joined to the outer side surface of the extension portion 18b of the lower frame 18 in the vehicle width direction by a weld bead 73 along the lower edge 61c and the leading edge of the protrusion 61d.
The side wall 62 is joined to the inner side surface of the extension portion 18b of the lower frame 18 in the vehicle width direction by a weld bead 74 (FIG. 5) along the leading edge of the lower edge 62c and the protrusion 62d.

With reference to FIGS. 5 and 8, the lower portion of the peripheral edge of the lower notch 69a of the rear wall 63 of the gusset 20 covers a portion of the rear end surface of the extension 18b from the rear.
The upper end of the lower notch portion 69a is separated upward from the upper portion of the rear end surface of the extension portion 18b. The lower end of the internal space of the gusset 20 communicates with the rear outside from the lower notch 69a.

With reference to FIGS. 4 and 6, the side wall 61 is provided with a hole 76.
The pillion step 43 includes a step stay 43a attached to the side wall 61 and a step 43b (FIG. 1) supported by the step stay 43a.
The step stay 43a has a rod shape extending rearward from the side wall 61. The step stay 43a is inserted into the hole 76 and joined to the side wall 61.

The gusset 20 includes a link connecting portion 77 to which the link member 38 is connected. The link connecting portion 77 is a hole portion that penetrates the side wall 61 and the side wall 62 in the vehicle width direction. The link connecting portion 77 is provided above the step stay 43a.
The link member 38 is connected to the gusset 20 via a first swing shaft 39 (FIG. 2) inserted through the link connecting portion 77. A pair of left and right swing shafts 39 are provided, and are attached to the left and right gussets 20, respectively.

FIG. 9 is a view of the link member 38 as viewed from the front side.
With reference to FIGS. 2, 4, 5 and 9, the link member 38 has a first connecting portion 81a connected to the left gusset 20 via a first swing shaft 39 (FIG. 2) and a first. It includes a first connecting portion 81b connected to the gusset 20 on the right side via a swing shaft 39.
Further, the link member 38 includes a rod-shaped left / right connecting member 82 that connects the first connecting portion 81a on one side (left side) and the first connecting portion 81b on the other side (right side) in the left-right direction, and the crankcase portion 32. A second connection portion 83 connected to the upper portion is provided.

The front portion of the first connection portion 81a is inserted into the internal space of the gusset 20 through the opening 70 of the gusset 20 on the left side, and is supported by the first swing shaft 39.
The front portion of the first connection portion 81b is inserted into the internal space of the gusset 20 through the opening 70 of the gusset 20 on the right side, and is supported by the first swing shaft 39.

One end of the left and right connecting member 82 is connected to the rear portion of the first connecting portion 81a on the left side. The other end of the left and right connecting member 82 is connected to the rear portion of the first connecting portion 81b on the right side.
The second connecting portion 83 is a tubular member extending in the vehicle width direction. The second connecting portion 83 is arranged at a position between the first connecting portion 81a and the first connecting portion 81b in the vehicle width direction, and is coupled to the lower surface of the left and right connecting members 82. The second connection portion 83 is arranged below the first connection portions 81a and 81b.
The link member 38 is connected to the crankcase portion 32 by a second swing shaft 40 (FIG. 2) inserted into the upper portion of the crankcase portion 32 and the cylinder of the second connecting portion 83.

Further, the link member 38 includes an arm member 84 extending upward and downward from the rear portion of the first connecting portion 81a on the left side.
The arm member 84 is arranged directly behind the rear wall 63 of the left gusset 20. An upper contact portion 84a facing the upper rear wall 68 from the rear is provided at the upper end portion of the arm member 84. At the lower end of the arm member 84, a lower contact portion 84b facing the lower rear wall 69 from the rear is provided.

The link member 38 swings around the first swing shaft 39 as the power unit 12 swings.
The swing range of the link member 38 is regulated by the arm member 84 swinging integrally with the first connecting portion 81a coming into contact with the rear wall 63 of the gusset 20 from behind. That is, the rear wall 63 is a stopper portion that comes into contact with the link member 38 and regulates the swing range of the link member 38.
Specifically, when the power unit 12 swings to the upper limit position, the upper contact portion 84a abuts on the upper rear wall 68. When the power unit 12 swings to the lower limit position, the lower contact portion 84b comes into contact with the lower rear wall 69.

With reference to FIGS. 4 and 5, in the vehicle body frame 10, the extension portion 18b of the lower frame 18 and the rear extension portion 19b of the rear frame 19 are vertically connected by the gusset 20, so that the rigidity of the vehicle body frame 10 is increased. It can be improved efficiently. Therefore, even if the wall thickness of the pipe material 50 constituting the rear frame 19 is made smaller than the wall thickness of the pipe material 25 constituting the main frame 17 and the lower frame 18, the weight of the rear frame 19 is reduced. The rigidity of the can be increased. Further, although the weight of the portion provided with the gusset 20 becomes large, since the gusset 20 is located closer to the center portion in the vehicle front-rear direction of the motorcycle 1, the influence of the weight increase on the running performance of the motorcycle 1 can be reduced.
Further, in the gusset 20, the lower end portion 20a is connected to the upper part of the rear extending portion 19b, and the gusset 20 does not extend below the rear extending portion 19b. Therefore, for example, the gusset 20 can be provided more compactly in the vertical direction as compared with the configuration in which the gusset is provided up to the lower end surface of the lower frame.

As described above, according to the embodiment to which the present invention is applied, the vehicle body frame 10 of the motorcycle 1 includes a head pipe 15, a main frame 17 extending downward from the head pipe 15, and rearward from the main frame 17. A lower frame 18 extending rearward and upward from the lower frame 18 is provided, and the rear frame 19 has an upward extending portion 19a extending upward from the lower frame 18 and an upward extending portion 19a extending rearward from the upper portion. A gusset 20 is provided at the rear portion 60 of the upward extending portion 19a with an extending rear extending portion 19b, and the lower frame 18 is an extension extending rearward from the connecting portion 57 between the lower frame 18 and the upward extending portion 19a. A portion 18b is provided, the gusset 20 extends up and down along the rear portion 60, the lower end portion 20a of the gusset 20 is connected to the extension portion 18b, and the upper end portion 20b of the gusset 20 is connected to the rear extension portion 19b. ..
According to this configuration, the extension portion 18b of the lower frame 18 and the rear extension portion 19b of the rear frame 19 are connected by the gusset 20 provided in the rear portion 60 of the upper extension portion 19a of the rear frame 19, so that the vehicle body is connected. The rigidity of the frame 10 can be efficiently improved.

Further, the lower frame 18 is a pipe material 25 extending in the front-rear direction, and the extension portion 18b is a portion in which the pipe material 25 is extended rearward from the connection portion 57.
According to this configuration, since the extension portion 18b is a portion in which the lower frame 18 which is the pipe material 25 is extended rearward from the connection portion 57, the extension portion 18b can be provided with a simple structure. Therefore, the rigidity of the vehicle body frame 10 can be improved with a simple structure.
Further, the lower edges 61c and 62c of the lower end portion 20a of the gusset 20 extend back and forth, the gusset 20 includes protrusions 61d and 62d protruding downward from the rear ends of the lower edges 61c and 62c, and the gusset 20 has a lower edge. The 61c, 62c and the protrusions 61d, 62d are welded to the side surface of the extension 18b.
According to this configuration, in the gusset 20, in addition to the lower edges 61c and 62c, the protruding portions 61d and 62d protruding downward from the rear ends of the lower edges 61c and 62c are welded to the side surface of the extension portion 18b. Therefore, the stress can be dispersed to the lower edges 61c and 62c and the protrusions 61d and 62d, and the stress concentration in the welded portion between the gusset 20 and the extension portion 18b can be effectively relaxed.

Further, the lower edges 61c and 62c are located above the axis 18a of the lower frame 18 in the vehicle side view, and the protrusions 61d and 62d extend downward to at least the position of the axis 18a in the vehicle side view.
According to this configuration, since the protrusions 61d and 62d extend downward to at least the position of the axis 18a of the lower frame 18, the protrusions 61d and 62d can be provided in a wide range above and below, effectively relaxing the stress concentration. can.
Further, the gusset 20 includes a pair of left and right side walls 61, 62 extending vertically along the rear portion 60, and a rear wall 63 connecting the rear ends of the left and right side walls 61, 62 in the vehicle width direction, and the lower end of the gusset 20. The portion 20a is joined to the extension portion 18b via the lower edges 61c and 62c of the side walls 61 and 62, and the upper end portion 20b of the gusset 20 is joined to the rear extension portion 19b via the upper edges 61b and 62b of the side walls 61 and 62. Will be done.
According to this configuration, since the gusset 20 includes a pair of left and right side walls 61, 62 and a rear wall 63, the rigidity of the gusset 20 is increased. Therefore, the rigidity of the vehicle body frame 10 can be effectively improved by the gusset 20.

Further, the link member 38 that swingably supports the power unit 12 is swingably connected to the gusset 20.
According to this configuration, the link member 38 can be connected to the vehicle body frame 10 with a simple structure using the gusset 20.
Further, the gusset 20 is provided with a rear wall 63 as a stopper portion that abuts on the link member 38 and regulates the swing range of the link member 38.
According to this configuration, the stopper portion that regulates the swing range of the link member 38 can be provided with a simple structure using the gusset 20.

Further, a gusset 20 is provided with a pillion step 43 for passengers.
According to this configuration, the pillion step 43 for passengers can be provided with a simple structure using the gusset 20.

It should be noted that the above embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above 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-riding vehicle having two front wheels or two rear wheels. It is applicable to saddle-riding vehicles equipped with four or more wheels.

1 Motorcycle (saddle-riding vehicle)
10 Body frame 12 Power unit 15 Head pipe 17 Main frame 18 Lower frame 18a Axis line 18b Extension 19 Rear frame 19a Upper extension 19b Rear extension 20 Gusset 20a Lower end 20b Upper end 25 Pipe material 38 Link member 43 Pillion step 57 Connection 60 Rear 61,62 Side wall 61a, 62a Leading edge 61b, 62b Upper edge 61c, 62c Lower edge (lower edge of lower end, lower edge of side wall)
61d, 62d Protruding part 63 Rear wall (stopper part)

Claims (8)

1. The head pipe (15), the main frame (17) extending downward from the head pipe (15), the lower frame (18) extending rearward from the main frame (17), and the rear upper part from the lower frame (18). The rear frame (19) is provided with an upward extending portion (19a) extending upward from the lower frame (18), and an upward extending portion (19a) extending upward from the upper portion to the rear of the upper extending portion (19a). In the body frame of a saddle-riding vehicle, which is provided with a rear extending portion (19b) extending to the rear and a gusset (20) is provided at the rear portion (60) of the upward extending portion (19a).
   The lower frame (18) includes an extension portion (18b) extending rearward from the connection portion (57) between the lower frame (18) and the upward extension portion (19a).
   The gusset (20) extends up and down along the rear portion (60), the lower end portion (20a) of the gusset (20) is connected to the extension portion (18b), and the upper end portion of the gusset (20) is connected. (20b) is a body frame of a saddle-riding vehicle, characterized in that it is connected to the rear extension portion (19b).
2. The lower frame (18) is a pipe material (25) extending back and forth, and the extension portion (18b) is a portion where the pipe material (25) is extended rearward from the connection portion (57). The body frame of the saddle-riding vehicle according to claim 1.
3. The lower edge (61c, 62c) of the lower end (20a) of the gusset (20) extends back and forth, and the gusset (20) protrudes downward from the rear end of the lower edge (61c, 62c). (61d, 62d)
   The gusset (20) according to claim 1 or 2, wherein the lower edge (61c, 62c) and the protrusion (61d, 62d) are welded to the side surface of the extension (18b). Body frame for saddle-riding vehicles.
4. The lower edges (61c, 62c) are located above the axis (18a) of the lower frame (18) in the vehicle side view, and the protrusions (61d, 62d) are at least the said in the vehicle side view. The body frame of a saddle-riding vehicle according to claim 3, wherein the vehicle body frame extends downward to the position of the axis (18a).
5. The gusset (20) has a pair of left and right side walls (61,62) extending vertically along the rear portion (60) and a rear wall connecting the rear ends of the left and right side walls (61, 62) in the vehicle width direction. With (63)
   The leading edge (61a, 62a) of the side wall (61, 62) is connected to the rear portion (60).
   The lower end (20a) of the gusset (20) is joined to the extension (18b) via the lower edge (61c, 62c) of the side wall (61, 62), and the upper end of the gusset (20). 20b according to any one of claims 1 to 4, wherein (20b) is joined to the rear extending portion (19b) via the upper edge (61b, 62b) of the side wall (61, 62). The body frame of a saddle-riding vehicle.
6. The saddle-riding type according to any one of claims 1 to 5, wherein a link member (38) that swingably supports the power unit (12) is swingably connected to the gusset (20). The body frame of the vehicle.
7. The saddle riding according to claim 6, wherein a stopper portion (63) that abuts on the link member (38) and regulates the swing range of the link member (38) is provided on the gusset (20). Body frame of a type vehicle.
8. The body frame of a saddle-riding vehicle according to any one of claims 1 to 7, wherein a pillion step (43) for a passenger is provided on the gusset (20).

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