CN220640134U - Frame of saddle-type vehicle - Google Patents

Abstract

The stress acting on the frame can be dispersed efficiently. A saddle-type vehicle frame, wherein a gusset (16) is provided with a joint (61) joined to a front riser (15) and a lower side connection (65) connected to a main frame (17), the front side joint (61) is formed by a front edge (51 a) of a front gusset (51) and a front edge (52 a) of a rear gusset (52), a joint (57) joining the front gusset (51) and the rear gusset (52) extends in the up-down direction on a side (16 a) of the gusset (16) in the vehicle width direction, the joint (57) has a first joint (81) extending upward from the lower side connection (65) side and a second joint (82) extending upward from a position above the first joint (81) toward the front side joint (61), and the second joint (82) is inclined forward than the first joint (82) in a side view of the vehicle.

Description

Frame of saddle-type vehicle

Technical Field

The present utility model relates to a frame of a saddle-type vehicle.

Background

Conventionally, a frame of a saddle-type vehicle in which a main frame extending downward from a front riser is connected to the front riser via a gusset bracket is known (for example, see patent literature 1).

In patent document 1, the gusset is hollow formed by a front gusset portion and a rear gusset portion joined to the front gusset portion from the rear, and the gusset includes a front side joining portion joined to the front riser and a lower side connecting portion connected to the main frame. The front-side joint portion is formed by a front edge of the front gusset portion and a front edge of the rear gusset portion, and a joint portion that joins the front gusset portion and the rear gusset portion extends in the up-down direction on a side surface of the gusset in the vehicle width direction.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2013-159468

Disclosure of Invention

Problems to be solved by the utility model

In the frame of the conventional saddle-ride type vehicle, the joint portion that joins the front gusset portion and the rear gusset portion extends straight up and down when the vehicle is viewed from the side. Therefore, the ratio of the front gusset portion to the rear gusset portion at the front side joint portion is likely to deviate, and stress may be concentrated on a part of the frame.

The present utility model has been made in view of the above-described circumstances, and an object of the present utility model is to provide a saddle-ride type vehicle frame in which the ratio of a front gusset portion to a rear gusset portion at a front side joint portion is made appropriate, and the stress acting on the frame can be efficiently dispersed.

Means for solving the problems

In the frame of a saddle-type vehicle, a main frame extending downward from a front vertical pipe is connected to the front vertical pipe via a gusset, the gusset is formed to be hollow by a front gusset portion made of a plate material and a rear gusset portion made of a plate material, the rear gusset portion is joined to the front gusset portion from the rear, the gusset includes a front side joining portion joined to the front vertical pipe and a lower side connecting portion connected to the main frame, the front side joining portion is formed by a front edge of the front gusset portion and a front edge of the rear gusset portion, and a joining portion joined to the front gusset portion and the rear gusset portion extends in a vertical direction on a side surface of the gusset in a vehicle width direction, and the joining portion includes a first joining portion extending upward from the lower side joining portion and a second joining portion extending upward from a position above the first joining portion toward the front side joining portion, and the second joining portion is inclined forward than the first joining portion in a side view of the vehicle.

In the above configuration, the main frame may be a pipe fitted to the lower connecting portion from below, and the first joint portion may be disposed parallel to the main frame at the lower connecting portion when the vehicle is viewed from the side.

In the above configuration, the front-side joint portion may extend vertically along the front pillar in a side view of the vehicle, and the front end of the second joint portion may be located at a middle portion of the front-side joint portion in the vertical direction.

In the above configuration, a reinforcing portion formed by projecting a portion of the rear wall portion in the plate thickness direction of the rear wall portion may be provided in the rear wall portion of the rear gusset portion, and the reinforcing portion may extend up and down in a linear shape.

In the above configuration, the main frame may be fitted to the lower connecting portion from below, and an upper end of the main frame may be spaced downward from a lower end of the reinforcing portion.

In the above configuration, the lower side connecting portion may be a cylindrical portion formed by joining the front gusset portion and the rear gusset portion in the front-rear direction, the lower side connecting portion may be provided with a pair of left and right, the main frame provided in the pair of left and right may be fitted into the left and right cylindrical portion from below, and a lower end surface of the cylindrical portion may be formed in an elliptical shape such that an end portion of the lower end surface on the outer side in the vehicle width direction is positioned higher than an end portion of the lower end surface on the inner side in the vehicle width direction.

In the above configuration, the lower side connecting portion may be a cylindrical portion formed by joining the front gusset portion and the rear gusset portion in the front-rear direction, and the joint portion may extend from a lower end surface of the lower side connecting portion to the front side joint portion, and the first joint portion may be located on an axis of the cylindrical portion in a side view of the vehicle.

Effects of the utility model

In the frame of the saddle-type vehicle, a main frame extending downward from a front pillar is connected to the front pillar via a gusset, the gusset is hollow by a front gusset portion made of a plate material and a rear gusset portion made of a plate material, the rear gusset portion is joined to the front gusset portion from the rear, the gusset includes a front side joining portion joined to the front pillar and a lower side connecting portion connected to the main frame, the front side joining portion is formed by a front edge of the front gusset portion and a front edge of the rear gusset portion, a joining portion joining the front gusset portion and the rear gusset portion extends in a vertical direction on a side surface of the gusset in a vehicle width direction, the joining portion includes a first joining portion extending upward from a side of the lower side connecting portion and a second joining portion extending upward from a position above the first joining portion, and the second joining portion is inclined forward than the first joining portion when the vehicle is viewed from a side.

According to this structure, the second joint portion is inclined forward than the first joint portion, and therefore, the boundary between the front gusset portion and the rear gusset portion at the front-side joint portion can be located further on the lower side. Therefore, the ratio of the front gusset portion to the rear gusset portion at the front side joint portion can be made appropriate, and the stress acting on the vehicle frame can be efficiently dispersed.

In the above configuration, the main frame may be a pipe fitted to the lower connecting portion from below, and the first joint portion may be disposed parallel to the main frame at the lower connecting portion when the vehicle is viewed from the side.

According to this configuration, the first joint portion is parallel to the main frame in a side view of the vehicle, and therefore, the lower connecting portion and the first joint portion can be formed in simple shapes.

In the above configuration, the front side joint portion may extend vertically along the front riser in a side view of the vehicle, and the front end of the second joint portion may be located at an intermediate portion between the front side joint portion.

According to this configuration, the front end of the second joint portion is located at the upper and lower intermediate portions of the front-side joint portion, so that the ratio of the front gusset portion and the ratio of the rear gusset portion can be made close to each other at the front-side joint portion, and the stress can be effectively dispersed.

In the above-described configuration, a reinforcing portion formed by projecting a part of the rear wall portion in the plate thickness direction of the rear wall portion may be provided in the rear wall portion of the rear gusset portion, and the reinforcing portion may extend vertically in a linear shape.

According to this structure, the reinforcement portion extending in the vertical direction can increase the rigidity of the angle bracket in a vertically long range with a simple structure.

In the above configuration, the main frame may be fitted to the lower connecting portion from below, and the upper end of the main frame may be separated downward from the lower end of the reinforcing portion.

According to this configuration, since the section where the main frame is not present is formed between the reinforcement portion and the main frame in the up-down direction, the vehicle frame can be reduced in weight.

In the above configuration, the lower connecting portion may be a cylindrical portion formed by joining the front gusset portion and the rear gusset portion in the front-rear direction, the lower connecting portion may be provided with a pair of left and right, the main frame provided in the pair of left and right may be fitted into the left and right cylindrical portion from below, and the lower end surface of the cylindrical portion may be an oval shape formed such that an end portion of the lower end surface on the outer side in the vehicle width direction is located at a higher position than an end portion of the lower end surface on the inner side in the vehicle width direction.

According to this configuration, since the lower end surface of the tubular portion is elliptical, the main frame can be easily fitted to the tubular portion, and the vehicle frame can be easily manufactured.

In the above configuration, the lower connecting portion may be a cylindrical portion formed by joining the front gusset portion and the rear gusset portion in the front-rear direction, and the joint portion may extend from a lower end surface of the lower connecting portion to the front-side joint portion, and the first joint portion may be located on an axis of the cylindrical portion in a side view of the vehicle.

According to this structure, the joint portion extends from the lower end surface of the lower connecting portion to the front side joint portion, the first joint portion is located on the axis of the cylindrical portion, and the front end of the second joint portion is located at the upper and lower intermediate portions of the front side joint portion, so that the stress can be efficiently dispersed to the front gusset portion and the rear gusset portion.

Drawings

Fig. 1 is a left side view of a motorcycle according to an embodiment of the present utility model.

Fig. 2 is a left side view of the motorcycle with a body cover or the like removed to expose a vehicle frame.

Fig. 3 is a front view of the frame as seen from the front.

Fig. 4 is a left side view showing a connection structure of the front riser and the main frame by the angle brackets.

Fig. 5 is a perspective view of the connection structure of the front riser and the main frame, which is achieved by the angle brackets, from the rear side.

Fig. 6 is a front view of the angle bracket from the front side.

Fig. 7 is a cross-sectional view taken along line VII-VII in fig. 4.

Detailed Description

An embodiment of the present utility model will be described below with reference to the drawings. In the description, unless otherwise specified, the directions of the front, rear, left, right, up and down are the same as the directions with respect to the vehicle body. In the drawings, the reference numeral "front" indicates the front of the vehicle body, the reference numeral "upper" indicates the upper side of the vehicle body, and the reference numeral "left" 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 present utility model.

The motorcycle 1 is a scooter-type saddle-type vehicle, and includes: a frame 10; a front fork 11 for supporting the front wheel 2 to be freely turnable; a power unit 12 supported at the rear of the frame 10; a rear wheel 3; and a seat 13 on which an occupant sits in a straddling manner.

The motorcycle 1 includes a body cover 14 for covering a body such as the frame 10.

Fig. 2 is a left side view of the motorcycle 1 with the body cover 14 and the like removed so that the frame 10 is exposed. Fig. 3 is a front view of frame 10 from the front.

The frame 10 includes: a front vertical pipe 1 provided at a front end portion of the frame 10; a gusset bracket 16 connected to the rear surface of the front riser 15; and a pair of left and right main frames 17 extending downward from the gusset brackets 16.

The frame 10 further includes a pair of left and right bottom 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 bottom frames 18.

Specifically, each rear frame 19 includes an upper extension portion 19a extending upward from the rear end portion of the bottom frame 18 and a rear extension portion 19b extending rearward from the upper portion of the upper extension portion 19 a. Both the upper extension 19a and the rear extension 19b are inclined with a front lower and a rear higher, but the rear extension 19b is more horizontal than the upper extension 19 a.

The frame 10 further includes a rear gusset 20 provided on an upper extension 19a of the rear frame 19.

The vehicle frame further 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 gusset brackets 16; a second cross member 21b that connects the left and right main frames 17 in the vehicle width direction below the first cross member 21a; a third cross member 21c connecting the left and right underframes 18 in the vehicle width direction; a fourth cross member 21d connecting front portions of the left and right rear frames 19 in the vehicle width direction; and a fifth cross member 21e connecting the rear portions of the left and right rear frames 19 in the vehicle width direction.

The front fork 11 is supported by the front pillar 15 so as to be rotatable in the left-right direction.

The front fork 11 includes: a steering shaft (not shown) rotatably supported by the front vertical pipe 15; a bridge member 22 fixed to a lower end portion of the steering shaft; and a pair of left and right fork tubes 23 supported by the bridge member 22 and extending downward from the bridge member 22.

The front wheel 2 is supported by an axle 2a that spans between lower ends of the left and right fork tubes 23.

The steering handle 24 is attached to the upper end of the front fork 11.

The power unit 12 extends in the vehicle front-rear direction below the rear frame 19.

The power unit 12 is a unit swing engine integrally provided with an arm 30 that supports the rear wheel 3 so as to be swingable and an engine 31 that drives the rear wheel 3.

The engine 31 is an internal combustion engine. The engine 31 includes a crankcase portion 32 that houses a crankshaft (not shown), and a cylinder portion 33 that extends forward from a front surface of the crankcase portion 32. A piston (not shown) connected to the crankshaft reciprocates in the cylinder 33. The cylinder portion 33 extends from the crankcase portion 32 through between the front portions of the left and right rear frames 19 and in front of the rear frames 19.

The arm portion 30 extends rearward from a 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 portion 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 crank case 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 pulleys and V-belts 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 described above.

An air cleaner box 35 is attached to an upper surface portion 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 frame 10.

The link member 38 is connected to the rear gusset 20 of the frame 10 via a first swing shaft 39 extending in the vehicle width direction.

The link member 38 is connected to an upper portion of the crankcase portion 32 via a second pivot 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 bumper 41 is provided between the rear end portion of the arm portion 30 and the rear end portion of the frame 10.

Referring to fig. 1, the seat 13 is disposed along the rear extension 19b of the rear frame 19, and is supported from below by the rear extension 19b.

A step 42 for the feet of an occupant seated in the seat 13 is located at the front lower side of the seat 13 and is supported from below by the underframe 18.

The body cover 14 includes: an upper cover 44 covering the handle 24; a front cover 45 that covers the front portion of frame 10 such as front pillar 15 from the front; an inner cover 46 that covers the front portion of the frame 10 such as the front pillar 15 from the rear; a lower cover 47 that covers the chassis 18 from the side; and a rear side cover 48 that covers the vehicle body below the seat 13 from the side.

The front fender 49 is attached to the front fork 11.

Fig. 4 is a left side view showing a connection structure of front riser 15 and main frame 17 by means of angle brackets 16. Fig. 5 is a perspective view of the connection structure of front riser 15 and main frame 17, which is achieved by angle brackets 16, from the rear side. Fig. 6 is a front view of the angle bracket 16 from the front side.

The front pillar 15 is cylindrical and extends vertically in the center of the vehicle width. Front riser 15 is inclined rearward relative to vertical when viewing the vehicle from a side view.

The gusset 16 is a hollow shell-shaped frame member formed by connecting the front gusset portion 51 and the rear gusset portion 52 to each other, and the front gusset portion 51 and the rear gusset portion 52 are each formed three-dimensionally by bending a plate material. The width of the angle brackets 16 in the vehicle width direction increases as going downward from the front riser 15 side. The front gusset portion 51 and the rear gusset portion 52 are press-formed products of a plate material.

The front gusset portion 51 is a member formed by bending a plate material extending vertically in the width direction at the center thereof so as to protrude forward when viewed from the whole. The upper portion of the front gusset portion 51 is curved toward the front side as a whole when the vehicle is viewed from the side.

The rear gusset portion 52 is a member formed by bending a plate material extending upward and downward at a widthwise central portion so as to protrude rearward as viewed from the whole.

The front gusset portion 51 includes a front wall portion 53 that forms a front surface of the front gusset portion 51, and a pair of left and right side wall portions 54 that extend rearward from left and right side portions of the front wall portion 53.

The lower portion of the front wall portion 53 extends upward and downward in a side view of the vehicle, and the upper portion of the front wall portion 53 is curved forward and extends forward and upward. Accordingly, the upper portion of the side wall portion 54 extends upward from the upper portion of the front wall portion 53.

The lower edge of the front gusset portion 51 is inverted U-shaped in the front view of fig. 6. The front gusset portion 51 includes a lower wall portion 70 extending rearward from a lower edge of the front gusset portion 51. The lower wall portion 70 is also inverted U-shaped in front view.

The rear gusset portion 52 includes a rear wall portion 55 that forms a rear surface of the rear gusset portion 52, and a pair of left and right side wall portions 56 that extend forward from left and right side portions of the rear wall portion 55.

The lower edge of the rear gusset portion 52 has an inverted U-shape in the front view of fig. 6. The rear gusset portion 52 includes a lower wall portion 71 extending forward from a lower edge of the rear gusset portion 52. The lower wall portion 71 is also inverted U-shaped in front view.

The front edge of the side wall portion 56 of the rear gusset portion 52 is joined with the rear edge of the side wall portion 54 of the front gusset portion 51 from the rear. The portion where the front edge of the side wall portion 56 joins the rear edge of the side wall portion 54 is a joining portion 57 that joins the front gusset portion 51 and the rear gusset portion 52.

The joint portions 57 are located on the side surfaces 16a on both sides of the gusset 16 in the vehicle width direction.

The joint 57 is linear extending in the vertical direction on the side surface 16a when the vehicle is viewed from a side. The front gusset portion 51 and the rear gusset portion 52 are joined by a weld 57a along the joint 57.

The front edge of the lower wall portion 71 of the rear gusset portion 52 is joined to the rear edge of the lower wall portion 70 of the front gusset portion 51 from the rear, and the rear gusset portion 52 and the front gusset portion 51 are welded to each other at the joined portion.

An opening 60 that opens forward is provided at the front end of the upper portion of the gusset 16. The opening 60 is a substantially rectangular opening long up and down in the front view of fig. 6. The peripheral edge of the opening 60 is a front-side joint 61 that joins the front pillar 15 from behind.

In the state where the angle bracket 16 is engaged with the front riser 15, the front-side engaging portion 61 is formed by the front edge 51a of the front angle bracket portion 51 and the front edge 52a of the rear angle bracket portion 52.

Specifically, the front edge 51a of the front gusset portion 51 is formed by the front edge 53a of the front wall portion 53 and the upper edges 54a of the left and right side wall portions 54.

The front edge 52a of the rear gusset portion 52 is composed of a front edge 55a of the rear wall portion 55 and upper edges 56a of the left and right side wall portions 56.

The front side engaging portion 61 extends upward and downward in a backward inclined posture along the front riser 15 when the vehicle is viewed from a side.

In the front view of fig. 6, the upper edges 54a and 56a that constitute the left and right side edges of the front side engaging portion 61 are continuous in a straight line in a side view of the vehicle, and are inclined rearward along the front riser 15.

In the front view of fig. 6, the front edge 53a that constitutes the lower edge of the front side engaging portion 61 is arcuate along the outer periphery of the front riser 15.

In the front view of fig. 6, the front edge 55a that constitutes the upper edge of the front side engaging portion 61 is arcuate along the outer periphery of the front riser 15.

The angle bracket 16 is joined to the front riser 15 by a weld 61a along the front side joint 61.

A lower connection portion 65 connected to the main frame 17 is provided at a lower portion of the angle bracket 16. The lower connection portions 65 are provided in a pair in the left and right directions corresponding to the left and right main frames 17.

The lower connecting portion 65 is a cylindrical portion extending vertically. The main frame 17 is a tube having a circular cross section and fitted into the tube of the lower connecting portion 65 from below.

The main frame 17 is inclined so as to be positioned outside in the vehicle width direction as going downward. In the front view of fig. 6, the lower connecting portion 65 is also inclined so as to be located outward in the vehicle width direction as going downward. That is, the axis 65a of the lower connecting portion 65 is inclined so as to be located outside in the vehicle width direction as going downward.

The lower side connecting portion 65 is formed in a cylindrical shape by joining the lower portion of the front gusset portion 51 and the lower portion of the rear gusset portion 52 front-to-rear and joining at the joining portion 57.

Specifically, a pair of left and right semi-cylindrical front side tube portions 66 that form the front portion of the lower side connecting portion 65 are provided at the lower portion of the front gusset portion 51. The front tube 66 is composed of a front wall 53, a side wall 54, and a lower wall 70.

A pair of left and right semi-cylindrical rear side tube portions 67 that constitute the rear portion of the lower side connecting portion 65 are provided at the lower portion of the rear gusset portion 52. The rear tube 67 is constituted by the rear wall 55, the side wall 56, and the lower wall 71.

The lower end surface 75 of the lower connecting portion 65 defines an opening that opens downward, and the upper end portion of the main frame 17 is fitted into the opening from below.

The lower end surface 75 is inclined obliquely with respect to the axis 65a of the lower connecting portion 65 in the front view of fig. 6, and the lower end surface 75 has an oval shape that is long in the up-down direction when viewed from the outside in the vehicle width direction.

The lower end surface 75 is formed in an elliptical shape such that an outer end 75a of the lower end surface 75 in the vehicle width direction is positioned higher than an inner end 75b of the lower end surface 75 in the vehicle width direction.

The main frame 17 fitted to the lower side connecting portion 65 is joined to the gusset 16 by a weld 75c along the lower end surface 75. Since the lower end surface 75 is elliptical, a long welding length by the weld bead 75c can be ensured, and the joint can be firmly joined. Further, since the lower end surface 75 is elliptical, the main frame 17 is easily fitted to the lower connecting portion 65.

Fig. 7 is a cross-sectional view taken along line VII-VII in fig. 4.

Referring to fig. 4 to 7, a reinforcing portion 77 formed by projecting a part of the rear wall portion 55 in the plate thickness direction of the rear wall portion 55 is provided in the rear wall portion 55 of the rear gusset portion 52.

The reinforcement portion 77 extends linearly in the up-down direction at the vehicle width direction center portion of the rear gusset portion 52. The reinforcing portion 77 is a convex portion protruding rearward. The reinforcing portion 77 is formed by deforming a part of the rear wall portion 55 by press working.

The reinforcement portion 77 extends from the upper end portion of the rear wall portion 55 to the same height position as the lower end portion of the front-side joint portion 61 in the up-down direction.

As shown in fig. 5, the upper end 17a of the main frame 17 is located in the angle bracket 16 above the lower end surface 75. That is, the upper end 17a of the main frame 17 is not directly connected to the front standpipe 15. In frame 10, since the strength and rigidity of angle bracket 16 are improved by reinforcing portion 77, the rigidity of frame 10 can be ensured without directly connecting main frame 17 to front standpipe 15.

The upper end 17a of the main frame 17 is spaced downward from the lower end 77a of the reinforcing portion 77. Therefore, the main frame 17 can be shortened, and the frame 10 can be made lightweight.

As shown in fig. 7, in the joint 57, the front edge of the side wall portion 56 of the rear gusset portion 52 overlaps the rear edge of the side wall portion 54 of the front gusset portion 51 from the vehicle width direction outer side. A weld 57a is formed along the leading edge of the side wall portion 56.

Referring to fig. 4 and 5, the joint 57 extends continuously from the lower end surface 75 of the lower side connecting portion 65 to the front side joint 61 at the side surface 16a of the angle bracket 16.

The joint 57 includes a first joint 81 extending upward from the lower connecting portion 65 side and a second joint 82 extending upward from the upper end of the first joint 81 toward the front joint 61.

The first joint 81 extends linearly upward from the vehicle width direction outer end 75a of the lower end surface 75 of the lower connecting portion 65. The upper end of the first engaging portion 81 is located at the same height position as the lower end portion of the front-side engaging portion 61.

The first joint 81 is disposed parallel to the main frame 17 and is located on the axis 65a of the lower connecting portion 65 when the vehicle is viewed from a side. The axis 65a extends substantially vertically when the vehicle is viewed from a side.

The second engaging portion 82 is inclined forward with respect to the first engaging portion 81 when the vehicle is viewed from a side. The second joint 82 is bent upward and forward from the upper end of the first joint 81, and extends linearly from the bent portion toward the upward and forward front joint 61. The second engaging portion 82 is inclined in such a manner as to be inclined forward with respect to the vertical direction.

In this way, the second joint 82 is inclined forward than the first joint 81, whereby the ratio of the front edge 52a of the rear gusset portion 52 at the front side joint section 61 can be increased. Therefore, the stress acting on the gusset 16 can be effectively dispersed to the rear gusset portion 52 and the front gusset portion 51.

For example, in the case where the second joint 82 is not provided and the first joint 81 extends upward to the front-side joint 61, the ratio of the front edge 52a of the rear gusset portion 52 in the front-side joint 61 becomes smaller, and the ratio of the front edge 51a of the front gusset portion 51 in the front-side joint 61 becomes larger. In this case, the stress concentrates on the front gusset portion 51.

Further, the front end 82a of the second joint 82 is located at the upper and lower intermediate portions of the front-side joint 61, and therefore the proportion of the front gusset portion 51 to the proportion of the rear gusset portion 52 in the front-side joint 61 can be made close. Therefore, the stress can be effectively dispersed to the front and rear gusset portions 51 and 52.

As shown in fig. 7, the front gusset portion 51 is formed in a convex shape so as to bend the entire plate material, and is formed in a curved shape as a whole.

On the other hand, the rear gusset portion 52 is formed in a convex shape so as to bend the left and right side portions of the plate material, and the curved portion is smaller than the front gusset portion 51.

The front gusset portion 51 having a curved shape as a whole can efficiently disperse stress acting on the gusset 16. Further, the curved portion has higher rigidity than the rear gusset portion 52, which is smaller than the front gusset portion 51, and the rigidity of the gusset 16 can be efficiently improved.

Further, the gusset 16 is formed into a case shape having a large number of curved surfaces by joining a plurality of curved plates, and therefore, even when the plate thickness is reduced, the rigidity can be improved. Accordingly, the frame 10 can be made lightweight.

As described above, according to the embodiment to which the present utility model is applied, in the frame 10 of the motorcycle 1, the main frame 17 extending downward from the front pillar 15 is connected to the front pillar 15 via the gusset 16, the gusset 16 is formed to be hollow by the front gusset portion 51 formed of a plate material and the rear gusset portion 52 formed of a plate material, the rear gusset portion 52 is joined to the front gusset portion 51 from the rear, the gusset 16 includes the front side joint portion 61 joined to the front pillar 15 and the lower side connection portion 65 connected to the main frame 17, the front side joint portion 61 is formed by the front edge 51a of the front gusset portion 51 and the front edge 52a of the rear gusset portion 52, the joint portion 57 joining the front gusset portion 51 and the rear gusset portion 52 extends in the up-down direction on the vehicle width direction side surface 16a of the gusset 16, the joint portion 57 includes the first joint portion 81 extending upward from the lower side connection portion 65 and the second joint portion 82 extending upward from the position above the first joint portion 81, and the second joint portion 82 is inclined forward when the vehicle 81 is viewed from the side.

According to this structure, the second joint portion 82 is inclined forward than the first joint portion 81, and therefore, the boundary between the front gusset portion 51 and the rear gusset portion 52 at the front side joint portion 61 can be located further on the lower side. Therefore, the ratio of the front gusset portion 51 to the rear gusset portion 52 at the front side joint portion 61 can be made appropriate, and the stress acting on the frame 10 can be efficiently dispersed.

The main frame 17 is a pipe fitted to the lower connection portion 65 from below, and the first joint portion 81 is disposed parallel to the main frame 17 at the lower connection portion 65 in a side view of the vehicle.

According to this configuration, the first joint 81 is parallel to the main frame 17 in a side view of the vehicle, and therefore, the lower connection portion 65 and the first joint 81 can be made to have simple shapes.

In a side view of the vehicle, the front side joint portion 61 extends up and down along the front standpipe 15, and the front end 82a of the second joint portion 82 is located at an intermediate portion between the up and down of the front side joint portion 61.

According to this configuration, the front end 82a of the second joint 82 is located at the upper and lower intermediate portions of the front side joint 61, so that the ratio of the front gusset portion 51 and the ratio of the rear gusset portion 52 can be made close to each other in the front side joint 61, and the stress can be effectively dispersed.

The rear wall portion 55 of the rear gusset portion 52 is provided with a reinforcing portion 77 formed by projecting a part of the rear wall portion 55 in the plate thickness direction of the rear wall portion 55, and the reinforcing portion 77 extends linearly up and down.

According to this structure, the reinforcement portion 77 extending in a linear shape can increase the rigidity of the angle bracket 16 in a vertically long range with a simple structure.

The main frame 17 is fitted to the lower connection portion 65 from below, and the upper end 17a of the main frame 17 is separated downward from the lower end 77a of the reinforcing portion 77.

According to this structure, since the section where the main frame 17 is not present is formed between the reinforcing portion 77 and the main frame 17 in the up-down direction, the frame 10 can be made lightweight.

The lower side connecting portion 65 is a cylindrical portion formed by joining the front gusset portion 51 and the rear gusset portion 52 in the front-rear direction, the lower side connecting portion 65 is provided with a pair of right and left, and the main frame 17 provided in the pair of right and left is fitted into the right and left cylindrical portion from below, and the lower end surface 75 of the cylindrical portion is formed in an elliptical shape such that the end 75a on the outer side in the vehicle width direction of the lower end surface 75 is positioned higher than the end 75b on the inner side in the vehicle width direction of the lower end surface 75.

According to this configuration, since the lower end surface of the tubular portion is elliptical, the main frame 17 is easily fitted to the lower connecting portion 65, which is the tubular portion, and the frame 10 is easily manufactured.

The lower side connecting portion 65 is a cylindrical portion formed by joining the front and rear gusset portions 51 and 52 in the front-rear direction, and the joint portion 57 extends from the lower end surface 75 of the lower side connecting portion 65 to the front side connecting portion 61, and the first joint portion 81 is located on the axis 65a of the cylindrical portion in a side view of the vehicle.

According to this structure, the joint 57 extends from the lower end surface 75 of the lower connecting portion 65 to the front side joint 61, the first joint 81 is located on the axis 65a of the lower connecting portion 65, which is a cylindrical portion, and the front end 82a of the second joint 82 is located in the middle portion of the front side joint 61 in the upper and lower directions, so that the stress can be efficiently dispersed to the front gusset portion 51 and the rear gusset portion 52.

The above-described embodiment is an embodiment to which the present utility model is applied, and the present utility model is not limited to the above-described embodiment.

In the above embodiment, the case where the reinforcing portion 77 is the convex portion protruding rearward has been described, but the reinforcing portion 77 is not limited to this, and may be formed by, for example, protruding a part of the rear wall portion 55 forward into the angle bracket 16. The reinforcing portion 77 may be formed by joining a linear reinforcing member extending vertically to the rear wall portion 55.

In the above embodiment, the motorcycle 1 has been described as an example, but the present utility model is not limited to this, and the present utility model can be applied to a 3-wheel saddle type vehicle having 2 front wheels or rear wheels and a saddle type vehicle having 4 or more wheels.

Description of the reference numerals

1: two-wheeled motor vehicles (saddle-type vehicles);

10: a frame;

15: a front riser;

16: a corner bracket;

16a: a side surface;

17: a main frame;

17a: an upper end;

51: a front gusset frame portion;

51a: a front edge (front edge of the front gusset portion);

52: a rear gusset frame portion;

52a: a front edge (front edge of the rear gusset portion);

55: a rear wall portion;

57: a joint;

61: a front side engaging portion;

65: a lower connecting part;

65a: an axis (axis of the cylindrical portion);

75: a lower end surface;

75a: an end (an end on the outer side in the vehicle width direction);

75b: an end (an end on the inner side in the vehicle width direction);

77: a reinforcing part;

77a: a lower end;

81: a first joint;

82: a second joint;

82a: a front end.

Claims (6)

1. A frame of a saddle-type vehicle, a main frame (17) extending downward from a front vertical pipe (15) is connected to the front vertical pipe (15) via a gusset (16), the gusset (16) is formed into a hollow by a front gusset (51) formed of a plate material and a rear gusset (52) formed of a plate material, the rear gusset (52) is joined to the front gusset (51) from the rear, the gusset (16) is provided with a front side joining portion (61) joining to the front vertical pipe (15) and a lower side connecting portion (65) connecting to the main frame (17), the front side joining portion (61) is formed by a front edge (51 a) of the front gusset (51) and a front edge (52 a) of the rear gusset (52), a joining portion (57) joining the front gusset (51) and the rear gusset (52) extends in a lower direction in a side (16 a) of the direction of the frame (16),

it is characterized in that the method comprises the steps of,

the joint (57) has a first joint (81) extending upward from the lower connecting portion (65) side and a second joint (82) extending upward from a position above the first joint (81) toward the front joint (61),

the main frame (17) is a tube fitted with the lower connecting part (65) from below,

the first joint part (81) is arranged parallel to the main frame (17) on the lower connecting part (65) when the vehicle is viewed from a side,

the second engaging portion (82) is inclined forward than the first engaging portion (81) when the vehicle is viewed from a side.

2. The frame of a saddle-type vehicle according to claim 1, wherein,

the front side engaging portion (61) extends up and down along the front riser (15) when the vehicle is viewed from a side view,

the front end (82 a) of the second joint (82) is located at the middle part of the front joint (61) in the upper and lower directions.

3. The frame of a saddle-type vehicle according to claim 1 or 2, wherein,

a reinforcing part (77) formed by projecting a part of the rear wall part (55) in the plate thickness direction of the rear wall part (55) is provided on the rear wall part (55) of the rear gusset part (52), and the reinforcing part (77) extends linearly up and down.

4. A frame for a saddle-ride type vehicle according to claim 3, wherein,

the main frame (17) is fitted with the lower connecting part (65) from below,

an upper end (17 a) of the main frame (17) is spaced downward from a lower end (77 a) of the reinforcement portion (77).

5. The frame of a saddle-type vehicle according to claim 1 or 2, wherein,

the lower side connecting portion (65) is a cylindrical portion formed by joining the front gusset portion (51) and the rear gusset portion (52) in the front-rear direction, the lower side connecting portion (65) is provided with a pair of right and left,

the main frame (17) arranged in a pair from left to right is fitted with the left and right cylindrical parts from below,

the lower end surface (75) of the tubular portion is formed in an elliptical shape such that an outer end (75 a) of the lower end surface (75) in the vehicle width direction is positioned higher than an inner end (75 b) of the lower end surface (75) in the vehicle width direction.

6. The frame of a saddle-type vehicle according to claim 2, wherein,

the lower side connecting part (65) is a cylindrical part formed by combining the front angle support frame part (51) and the rear angle support frame part (52) in a front-rear manner,

the joint (57) extends from a lower end face (75) of the lower connecting portion (65) to the front joint (61),

the first engagement portion (81) is located on an axis (65 a) of the cylindrical portion when the vehicle is viewed from a side.