JPH09207855A - Frame structure for horseback type four-wheel vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of welding part items for constituting a frame, and a welding length also welding manhour, facilitate the mounting/dismounting of the respective parts to the frame. SOLUTION: One cross member 38, for connecting right and left main upper members 31 and 31, is used as the upper part journaling bracket of a steering shaft, and the bracket 38 is provided with a front fender fitting part concurrently a tank cover fitting part 101, a fuel tank front fitting part 102, a steering shaft upper bearing fitting part 103, an ignition coil fitting part 104, and an engine upper part fitting part 105.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of a riding type four-wheeled vehicle such as a four-wheeled vehicle.

[0002]

2. Description of the Related Art In general, a riding type four-wheeled vehicle mounts front wheels on the front left and right sides of a frame (body frame) via suspension devices (struts and the like) and swings around a pivot shaft provided at the center of the frame. The left and right rear wheels are mounted on a swing arm that is movably supported and suspended by a load-carrying cushion unit, and the steering shaft that is supported by the front of the frame and connected to the left and right front wheels is turned by the handle. The vehicle is steered by driving the vehicle, and the vehicle is driven by driving rear wheels with an engine mounted in the center of the frame.

A fuel tank, a seat, a carrier, and the like are mounted on an upper portion of the frame from the front, and a driver grips the handle across the seat and mounts a foot board (step) mounted on the left and right of the lower portion of the frame. )
Steering with your feet on. References disclosing a frame of a riding type four-wheeled vehicle of this type include, for example, Japanese Patent Laid-Open No. 5-105159.
No. 6, Tokuhei 6-86230, Actual Kaihei 1-138891
No. (Actual Application Sho 63-35244).

The frame of the riding type four-wheeled vehicle is usually formed by a welding assembly such as a pipe, and generally includes left and right main upper members, left and right main lower members, and left and right main upper members. A plurality of side members that connect the lower member at a plurality of positions at predetermined intervals in the front-rear direction, a plurality of cross members that connect the left and right main upper members at a plurality of positions in the front-rear direction, and left and right extending rearward from the left and right main upper members. The vehicle includes a seat rail and left and right rear members that extend diagonally from the middle of the rear side member toward the middle of the seat rail.

A number of brackets for mounting an engine, an air cleaner, a fuel tank, a seat, a carrier, a radiator, various electric components and the like are fixed to the frame by welding or bolt fastening.

[0006]

However, in the conventional frame structure of the riding type four-wheeled vehicle, since a bracket is generally provided for each mounting component, the number of welding components increases and the number of welding steps also increases. There are various aspects.

The present invention has been made in view of such prior arts, and an object of the present invention is to reduce the number of welding parts constituting a frame and to reduce the welding length and the number of man-hours. It is possible to provide a frame structure for a riding type four-wheel vehicle in which each component can be easily attached / detached to / from the frame, and thereby productivity can be improved.

[0008]

According to a first aspect of the present invention, there is provided a frame structure for a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of front and rear positions. The cross member arranged in the part is used as a steering upper mounting bracket that pivotally supports the upper part of the steering shaft, and the front fender mounting portion, the fuel tank front mounting portion, the tank cover mounting portion, and the steering wheel are mounted on the bracket. The above object is achieved by providing a bearing mounting portion for fixing the upper bearing of the shaft and an engine mounting portion.

According to a third aspect of the present invention, in a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, the frame structure is arranged at the front side portion. The cross member is used as a strut mounting bracket for mounting the upper parts of the left and right wheel suspension struts, and the bracket is provided with a front fender support portion, a front carrier mounting portion, and a regulator mounting portion. Is achieved.

According to a fourth aspect of the present invention, in a frame structure of a riding type four-wheel vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a pipe having a rectangular cross section as the upper member. Using, the rear ends of the left and right upper members are cut diagonally, and the both ends of the rear pipe connected to the rear ends of the left and right upper members are double pipes to be crushed and flattened, and the diagonal cut The above-described object is achieved by fixing the flattened double pipe portion to the back side of the portion to connect the rear pipe to the left and right upper members and providing the rear pipe with a carrier attachment portion. Is.

According to a fifth aspect of the present invention, in a frame structure for a riding type four-wheeled vehicle having a structure in which left and right lower members are connected by cross members arranged at a plurality of positions in the front-rear direction, the left and right lower members are provided with front and rear parts of the frame. By fixing pipes of rectangular cross-section protruding outward left and right from positions at predetermined intervals in the front-rear direction in the substantially central portion of the direction, and by using the mounting holes formed in each pipe to fasten the left and right footboards, The above object is achieved.

According to a sixth aspect of the present invention, in a frame structure for a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a roof portion is formed at a front end portion of the frame. The above object is achieved by providing a flat plate cross member for use as a radiator upper part fixing bracket for fixing the upper part of the radiator and by covering the space between the radiator and the frame by the cross member. To do.

According to a seventh aspect of the present invention, in a frame structure of a riding type four-wheeled vehicle having a configuration in which left and right lower members are connected by cross members arranged at a plurality of positions in the front-rear direction, in a substantially central portion of the frame in the front-rear direction. A cross member at the front of the engine and a cross member at the rear of the engine that connect the left and right main lower members are provided at predetermined intervals in the front and rear of the engine mounting area.These cross members are recessed in the central part. The object described above is achieved by mounting the engine by fastening a bracket, which is made of a plate-shaped molded product having a cross-sectional shape and is attached to the engine in advance, to these cross members.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view of a riding type four-wheeled vehicle suitable for applying the present invention, and FIG. 2 is a plan view of FIG. In FIGS. 1 and 2, an engine 11 is provided at the center of a frame (vehicle body frame) 10 made of a pipe welded structure.
The left and right front wheels 12, 12 as steering wheels are suspended on both sides of the front part of the frame 10, and the left and right rear wheels 1 driven by the engine 11 are mounted on the rear part of the frame 10.
Three and thirteen are suspended.

A steering shaft 14 extending substantially vertically is rotatably supported at the front of the frame 10, a bar handle 15 is fixed to the upper end of the steering shaft 14, and a left and right steering shaft 14 is provided at the lower part of the steering shaft 14. Tie rods (not shown) leading to the front wheels 12, 12 are connected. The left and right front wheels 12 are independently suspended on both sides of the front portion of the frame 10.

The left and right rear wheels 13, 13 are suspended by a swing arm 16 and a load carrying cushion unit 17, and are driven by the engine 11 via a transmission mechanism (not shown) such as a drive shaft or a drive chain. This transmission mechanism is connected to a differential gear (not shown) that drives the left and right rear wheels 13, 13. Left and right front wheels 12,
12 are individually (independently) suspended from the front portion of the frame 10 by a swingable link mechanism (not shown) and a load-carrying strut (cushion unit) 27. Further, a radiator 28 for cooling the cooling water of the engine 11 is attached to the front end of the frame 10.

A front carrier 18, a fuel tank 19, a seat 20, and a rear carrier 21 are attached to the upper portion of the frame 10 from the front, and footboards (steps) 22 are attached to both lower portions of the frame 10. Further, covers made of molded products such as plastics, such as a front fender 23, a tank cover 24, a rear fender 25, and a side cover 26, are detachably attached to the frame 10. The driver
Straddle the seat 20, put your feet on the foot board 22,
The driver operates while gripping the bar handle 15 (specifically, the grip portion thereof).

FIG. 3 is a perspective view of the frame 10 in FIG. 3, the frame 10 includes left and right main upper members 31, 31 extending in the front-rear direction, left and right main lower members 32, 32 extending in the front-rear direction, and a main upper member 31 and a main lower member 32 on the left and right sides, respectively. A plurality of side members 33, 34, 35 connecting the front and rear direction at a plurality of predetermined intervals,
A plurality of cross members 36, 37 connecting the left and right main upper members 31, 31 at a plurality of positions in the front-rear direction,
38, 39, 40, 41 and a plurality of cross members 42, 43, 44, 45 connecting the left and right main lower members 32, 32 at a plurality of positions in the front-rear direction.

The frame 10 also serves as a cross member, which connects the left and right side members 33, 33 at the frontmost portion, a cross member 47, which connects the left and right side members 35, 35 at the rearmost portion. The steering support member 48, the left and right main upper members 31, a rear end member 49 connecting the rear end portions of the 31 and the rearmost left and right side members 35,
Main upper members 31, 31 in the middle of 35 and left and right
Left and right rear members 50, 50 for connecting the rear extension portion (seat rail portion) of the vehicle.

In FIG. 3, to the left and right of the substantially central portion of the frame 10, a removable sub-frame member 75,
75 are connected. This subframe member 7
5 and 75 make it easy to mount and remove the engine 11 even when the engine 11 is large, and
This is for reducing the weight of the vehicle. In the illustrated example, an engine mounting bracket 76 is provided on each of the sub-frame members 75, 75. Further, each sub-frame member 75 is bolted at its upper end to a bracket 77 provided on the main upper member 31, and at its lower end is bolted to a bracket 78 provided below the rearmost side member 35. ing.

In the frame 10 of FIG. 3, the engine guard 51 connected between the central portions of the left and right main lower members 32, 32 and the front and rear pairs fixed to the outside of the left and right main lower members 32, 32. Step members 52, 52 and left and right side members 3 at the end
The left and right pivot bearing portions 53, 53 of the swing arm 16 provided at the lower portions of the reference numerals 5, 35 are provided.

As a first feature of the frame 10 of FIG. 3, the cross member 38 arranged in the front portion is used as a steering upper part mounting bracket for pivotally supporting the upper part of the steering shaft 14 (FIG. 1). 38, a front fender mounting portion, a fuel tank front mounting portion, a tank cover mounting portion, a bearing mounting portion for fixing the upper bearing of the steering shaft 14, and an engine mounting portion are further provided. The bracket 38 is equipped with a stopper for restricting the turning range of the steering shaft 14 and a mounting portion for the ignition coil.

FIG. 4 is a perspective view of the cross member (steering top mounting bracket) 38. In FIG. 4, the cross member 38 is formed of a press-formed product of a plate material such as a steel plate, and is fixed to the left and right main upper members 31, 31 by welding at both left and right ends thereof. The cross member (steering upper part mounting bracket) 38 has front fender mounting parts 101, 101 formed at two positions on the left and right of the upper part.
Left and right fuel tanks 1 consisting of rearward facing recesses or openings
9, front mounting portions 102, 102 and a bearing mounting portion 10 of the steering shaft 14 formed in the upper center part.
3 and a mounting portion 1 for an ignition coil (not shown)
04 and a mounting portion (mounting hole) 105 on the front upper portion of the engine 11 are provided.

FIG. 5 is a cross-sectional view of the front fender mounting portion 101 taken along the line 5-5 in FIG. 4, and in this embodiment, the rear upper portion of the front fender 23 and the front of the tank cover 24 of the fuel tank 19. The parts are the same attachment parts 101 each having the fixing nut 140 at two locations.
Are fastened together by a common bolt 106.
FIG. 6 is a cross-sectional view of the front mounting portion 102 of the fuel tank 19, in which the front portion of the fuel tank 19 is attached to the mounting portion 102 formed of recesses (or openings) formed at two positions on the left and right of the cross member 38. The front portion of the fuel tank 19 is supported by the cross member 38 by fitting the rubber damper 108 mounted on the projection 107 provided in the section with a slight press-fitting margin.

FIG. 21 shows the engine mounting portion 10 in FIG.
5 is a partial cross-sectional view showing a state in which the front upper portion of the engine 11 is attached to the engine 5. FIG. In FIG. 21, the cross member 3
Bolts 141 on the engine mounting parts 105, 105 of FIG.
And the distance collar 143 by the nut 142,
143 is fastened and fixed, and the distance collar 143,
Cylindrical rubber damper 14 held by 143
4, the connecting bracket 145 is vibration-isolatedly supported, and at the other end of the connecting bracket 145, the front upper portion (the boss portion formed on the front side) 146 of the engine 11 is attached to the bolt 14.
7 and a nut 148.

FIG. 7 is a perspective view showing the steering shaft upper bearing 110 fastened to the bearing mounting portion 103 with two bolts 109. In FIG. 7, the steering shaft 14 (FIG. 1) is rotatably supported around the axis by the bearing 110, and in the vicinity of the bearing 110 of the cross member 38, the turning range of the steering shaft 14 (of the handle 15). Left and right stoppers 111, 111 (FIGS. 4 and 7) for restricting the rotation range) are provided.

The steering shaft 14 has engaging projections 11 which can abut the left and right stoppers 111, 111.
2 are provided. An ignition coil (not shown) for ignition of the engine 11 is fastened to the mounting portion 104 formed at the lower portion of the cross member 38 with a bolt (not shown) or the like.

The second feature of the frame 10 of FIG. 3 is that the cross member 37 arranged in the front portion is used as a strut mounting bracket for mounting the upper parts of the left and right wheel suspension struts 27, 27 (FIG. 1). Then
The bracket 37 has two front fender support portions 113, 113 on the left and right sides, upper mounting portions 116, 116 of the struts 27, 27, and a front carrier 18.
(FIGS. 1 and 2) is provided with rear mounting portions 114, 114 and a central regulator mounting portion 115.

FIG. 8 is a perspective view of the cross member (strut mounting bracket) 37. In FIG. 8, a cross member 37 is formed by a press-molded product of a plate material such as a steel plate, and is arranged on the front side of the cross member 38 and fixed to the left and right main upper members 31, 31 by welding. The cross member (strut mounting bracket) 37 has strut mounting portions 1 formed at two left and right positions for mounting the upper ends of the left and right wheel suspension struts 27, 27 (FIG. 1).
16, 116 are provided.

FIG. 9 is a partial side view showing a state in which the upper end portion of the strut 27 is connected to the strut mounting portion 116, and the male screw portion protruding from the upper end portion of the strut 27 is inserted into the strut mounting portion (hole) 116. The upper end portion of the strut 27 is joined to the frame 10 by fastening the male screw portion to the cross member 37 with the nut 118. The lower end of the strut 27 is connected to a link mechanism (not shown) that swings together with the front wheel 12.

FIG. 10 shows the front fender support portion 1 described above.
FIG. 13 is a partial vertical cross-sectional view showing a state in which the front fender 23 is supported by 13, and rubber dampers 117 are attached to the left and right front fender support portions (holes) 113,
The left and right rubber dampers 117 and 117 are configured to support the left and right portions of the upper portion of the front fender 23.

In FIG. 8, left and right front carrier rear mounting portions (holes) formed on the cross member 37.
Brackets (not shown) provided on the left and right of the rear portion of the front carrier 18 (FIGS. 1 and 2) are fastened to 114, 114 with bolts (not shown). The regulator mounting portion 115 is formed at the center of the cross member 37.

The regulator mounting portion 115 is formed as a flat surface which is recessed downward in order to secure a regulator housing space between the regulator mounting portion 115 and the front fender 23.
A regulator 119 is fixed on the flat surface 115 with screws or the like. Also, this regulator mounting part 1
Reference numeral 15 is open in the front-rear direction as shown in the drawing, and is configured to promote the cooling effect of the regulator 119 by circulating the traveling wind from the front toward the rear.

As a third feature of the frame 10 of FIG. 3, pipes having a rectangular cross section (for example, a square cross section) are used as the left and right main upper members 31, 31, and the rear ends of the left and right main upper members 31, 31 are used. The part is cut diagonally, and the both ends of the rear pipe (rear end member in FIG. 3) 49 connected to the rear ends of the left and right upper members are made into a double pipe and are flattened by crushing into a longitudinal section, The rear pipe 49 is connected to the left and right upper members 31, 31 by fixing the flattened double pipe portion to the back side (flat surface) of the oblique cut portion of the upper members 31, 31 by welding or the like,
Further, the rear pipe 49 is provided with a rear carrier mounting portion 79 (FIGS. 1 and 3) for mounting the rear portion of the rear carrier 21 (FIGS. 1 and 2).

FIG. 11 shows the main upper member 31.
Rear end and the rear pipe (rear end member) 49
FIG. 12 is a partial plan view showing a connection portion with and, and FIG. 12 is a sectional view taken along line 12-12 in FIG. 11. 11 and 1
2, a diagonal cut portion 120 is formed by diagonally cutting the outside of the main upper member 31 formed of a pipe having a rectangular cross section, and the diagonal cut portion 12 is formed.
A rear pipe (rear end member) 49 is connected along the flat surface on the back side of 0 by fixing the ends by welding or the like.

The connecting portions 121 at both ends of the rear pipe 49 are
As shown in the figure, it is made into a double pipe and flattened by crushing it into a vertically long cross section.
1 is fixed by welding or the like in a state where it is aligned with the flat surface on the back side of the oblique cut portion 120. By constructing a structure in which the connecting portion of the rear pipe 49 is a double pipe and is crushed, the reinforcing gusset can be omitted or downsized. The outer pipe (rear pipe 49) and the inner pipe in the double pipe portion may be integrally fixed to each other by press fitting or partial welding.

As shown in FIGS. 1 and 3, the rear pipe 49 is provided with two rear carrier mounting portions 79 for mounting the rear portion of the rear carrier. The rear carrier mounting portion 79 is composed of a bracket welded to the rear pipe 49. By extending the rear end portion of the rear pipe 49 above the rear carrier 21 and connecting the left and right, the rear carrier 2
The rear carrier 21 can have a function as a rear end stopper, which allows the rear carrier 21 to have a simple planar shape.

As a fourth feature of the frame 10 of FIG. 3, the left and right main lower members 32, 32 project outwardly in the left and right directions from two positions in the front-rear direction substantially central portion of the frame 10 at predetermined intervals in the front-rear direction. The pipe (step member 52) having a rectangular cross section is fixed, and the left and right footboards 22 are fastened using the mounting holes formed in each pipe.

FIG. 13 is a cross-sectional view of the step member 52 and the footboard 22 at an arbitrary position as seen along the step member, and FIG. 14 is a line 14 in FIG.
It is sectional drawing in alignment with -14. 1 to 3, 13, and 14, a predetermined front-rear interval (for example, about 20 cm) is provided at a position corresponding to a substantially central portion in the front-rear direction of the frame 10 of each main lower member 32 (a region of a foot of a rider). Step members 52, 52 protruding outward in the left-right direction from two locations (about 50 cm) are fixed by welding or the like.

Each step member 52 is formed of a pipe having a rectangular cross section (for example, a square cross section), and a flat foot board 22 is attached so as to cover the upper surfaces of the pair of front and rear step members 52. That is, mounting holes 122 for fixing the footboard 22 are formed at a plurality of predetermined positions on the upper surface of each step member 52 made of a pipe having a rectangular cross section, and the bolts inserted from the mounting holes of the footboard 22 are formed. (Or screw)
The foot board 22 is attached to the upper surface of each step member 52 by screwing 123 to the attachment hole 122. As the mounting hole 122 of the step member 52, a tapped hole can be used, or a structure in which a nut is joined or welded to the back surface of the hole can be adopted.

As a fifth feature of the frame 10 of FIG. 3, a flat plate cross member 36 forming a roof portion 151 is provided at the front end portion of the frame (in the illustrated example, the front end portions of the main upper members 31, 31). The cross member 36 is used as a radiator upper fixing bracket for fixing the upper portion of the radiator 28 (FIG. 1), and the roof portion 151 of the cross member 36 covers between the radiator 28 and the frame. .

FIG. 15 is a partial perspective view showing the cross member (radiator upper fixing bracket) 36 and the radiator 28, and FIG. 16 is a sectional view taken along the line 16-16 in FIG. In FIGS. 1, 3, 15, and 16, the front parts of the left and right main upper members 31, 31 are connected by a cross member 36 made of a flat plate. The cross member 36 has the shape of a roof (see the roof portion 151) that covers the upper rear area of the radiator 28,
The upper end of the radiator 28 is fastened to the front surface thereof.

In FIGS. 15 and 16, two front and rear radiator mounting portions (openings and welding nuts) 152, 152 are provided on the front surface of the cross member 36 having a roof shape as a whole. , Radiator 2
At the upper end of 8, the radiator mounting portions 152, 15
A mounting bracket 153 having left and right openings 154, 154 coupled to the two is fixed.

In the radiator mounting structure shown in FIGS. 15 and 16, rubber dampers (grommets of a rubber-like elastic body) 155, 155 are fitted and mounted in the openings 154, 154, and the inner diameters of the grommet 155, 155 are fitted. The distance collars 156 and 156 are fitted and mounted, and
By fastening bolts 157, 157 inserted through the distance collars 156, 156 from the front to the welding nuts 152, 152 on the side of the cross member 36, the upper end of the radiator 28 is vibration-proof (buffered) against the cross member 36. ) Are bound together.

As is clear from the above description, the cross members 36 are the left and right main upper members 3.
In addition to the function as a cross member for connecting the first and the third members, it has a function as an upper mounting means of the radiator 28 and a function of covering the space between the cross member 36 and the radiator 28 by its roof shape.

The cross member 36 and the radiator 28
The function of covering the gap is to block (block) muddy water and the like that jumps in from the front upper surface during traveling, and to make it difficult for hot air after passing through the radiator 28 to reach the upper portion inside the vehicle body. It is not necessary to explain the former mud water blocking function, but the latter need to prevent hot air from flowing into the upper part is as follows.

That is, in order to minimize the inclusion of dust and the like in the intake air of the engine 11 (FIG. 1),
The suction port should be placed as high as possible and in a covered position (in the vehicle of FIG. 1, for example, under the front fender 23, and where necessary, an inner fender (not shown)). In this embodiment, the air suction port 160 shown in FIG.
It is provided at the position indicated by (the upper front part in the vehicle body).

In addition, it is required to avoid temperature rise in the vicinity of the intake air suction port 160 of the engine due to hot air after passing through the radiator 28 as much as possible in view of filling efficiency. This is the cross member 3
6 is the reason why it is difficult for the hot air after passing through the radiator 28 to go to the upper part. The radiator 28 is appropriately fastened or supported at its lower end portion to another member of the frame 10 (for example, the cross member 46 in FIG. 3).

A sixth feature of the frame 10 shown in FIG. 3 is that of the front part of the engine for connecting the left and right main lower members 32, 32 to the engine mounting area at the center of the frame 10 in the front-rear direction at predetermined intervals. Cross member 4
4 and a cross member 45 at the rear of the engine are provided, and each of these cross members 44, 45 is made of a plate material having a hat-shaped cross section with an inverted brim in which the central portion is recessed downward, and is attached to the engine 11 in advance. The bracket 11 is fastened to the cross members 44 and 45 from below to mount the engine 11 on the frame 10.

FIG. 17 is a perspective view showing the cross member 44 in the front part of the engine and the cross member 45 in the rear part of the engine. FIG. 18 shows the front lower part of the engine 11 attached to the cross member 44 in the front part of the engine. FIG. 19 is a vertical sectional view in the left-right direction shown in FIG.
19 is a sectional view taken along line 19, and FIG. 20 is a perspective view of an engine bracket 128 described later. The engine 11
The front and rear lower parts of the engine are attached to the cross member 45 at the rear of the engine. The structure of the rear lower part, including the cross member 45 itself, is substantially the same as the structure of the front lower part described below with reference to FIGS. Have the same configuration.

In FIG. 17, the cross member 44 at the front of the engine and the cross member 45 at the rear of the engine are
Each of them is made of a plate material having a hat-shaped cross-section (FIG. 19) with an inverted brim in which the central portion is recessed downward. Then, the engine 11 is attached to these cross members 44 and 45 via engine brackets 128 and 128 which are attached to the left and right of the engine 11 in advance.

FIG. 17 shows the cross members 44 and 45.
The layout of the engine mounting holes 129 formed in FIG. The cross-sectional shape of each cross member 44, 45 is as shown in FIG.
The width becomes wider as it gets closer to the welded joint with 2, so that sufficient joint strength can be obtained without using a reinforcing gusset or the like. Also, each cross member 4
As shown in FIG. 17 and FIG. 19, the bending rigidity is ensured by forming each of the parts 4 and 45 into a hat-shaped cross section with an inverted brim in which the central part is recessed downward.

18 and 19, the engine 11
A mounting hole 130 penetrating in the left-right direction is formed in the front lower part of the engine bracket 1, and a mounting bolt (mounting shaft) 131 and a nut 132 penetrating the mounting hole 130 are provided on the left and right of the front lower part of the engine 11.
28 and 128 are attached. In the illustrated example, each of the left and right engine brackets 128, 128 is
Spacer with flange (or distance collar)
133 through the hollow cylindrical body (rubber damper) 134 made of a rubber-like elastic body for supporting vibration isolation.
It is attached to the left and right of the lower front part of the engine 11 by 131 and nuts 132.

Each engine bracket 128 is specifically shown in FIG.
As clearly indicated by 0, it has an annular portion 135 having an inner diameter into which the rubber damper 134 is fitted and mounted, and a pedestal portion 136 integrated under the annular portion by welding or the like. Further, mounting holes 137 (two positions for each bracket 128) corresponding to the engine mounting holes 129 of the cross member 44 are formed on the bottom surface of the pedestal portion 136, and a nut 138 is welded to the upper surface of each mounting hole 137. It is fixed by etc.

When the engine brackets 128 are attached to the left and right front lower portions and the left and right rear lower portions of the engine 11 through the distance collar 133 and the rubber damper 134 by the mounting bolts 131 and nuts 132, the engine 11 is a cross member. Attached to 44 and 45. That is, the engine 11 is connected to the frame 1
When mounted on 0, the engine 11 with the engine bracket 128 attached is arranged at a predetermined position of the frame 10, and the engine mounting bolt 13 is attached from the lower side of the cross members 44 and 45 as shown in FIGS. 18 and 19.
9 is inserted from each engine mounting hole 129 and screwed and fastened to each nut 138 of each engine bracket 128, so that the front lower part and the rear lower part of the engine are the frame 1
0 is attached.

In the illustrated example, the front lower part and the rear lower part of the engine are provided on the left and right engine brackets 12, respectively.
Four engine mounting bolts in total, one through four
It is fastened to the frame 10 by 39. Thus,
The lower front portion and the lower rear portion of the engine 11 are shown in FIGS.
The mounting structure is substantially the same as the mounting structure shown in FIG.

According to the lower mounting structure of the engine 11 described with reference to FIGS. 17 to 20, when the mounting and dismounting of the engine can be performed from the lower side of the cross members 44 and 45, the engine 11 is A large-sized member facing the bottom surface of the engine and the frame 10 (for example, the main lower member 31 or the engine guard 5)
Even if there is a small gap with 1), it can be easily performed.

[0058]

As is apparent from the above description, according to the invention of claim 1, a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction. In the frame structure, a cross member arranged in the front portion is used as a steering upper part mounting bracket that pivotally supports the upper part of the steering shaft, and the front fender mounting part, the fuel tank front mounting part, and the tank are attached to the bracket. Since the cover mounting portion, the bearing mounting portion for fixing the upper bearing of the steering shaft, and the engine mounting portion are provided, the number of welding parts constituting the frame can be reduced, and the welding length and man-hours can be reduced. It is easy to attach and remove each part from the frame Can be performed, it frame structure of straddle-type four-wheel vehicle which can improve productivity by is provided.

According to the third aspect of the present invention, in the frame structure of the riding type four-wheeled vehicle having the structure in which the left and right upper members are connected by the cross members arranged at a plurality of positions in the front and rear direction, the frame structure is arranged at the front portion. The cross member is used as a strut mounting bracket for mounting the upper parts of the left and right wheel suspension struts, and the bracket is provided with a front fender support portion, a front carrier mounting portion, and a regulator mounting portion. It is possible to reduce the number of welding parts that make up the parts, reduce the welding length and the number of man-hours, and easily attach and detach each part to and from the frame, thereby improving productivity. A frame structure for a riding type four-wheeled vehicle is provided.

According to the invention of claim 4, in a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, the upper member has a rectangular cross section. Using the pipe of the above, the rear ends of the left and right upper members are cut diagonally, and both ends of the rear pipe connected to the rear ends of the left and right upper members are made into double pipes and flattened by crushing, Since the rear pipe is connected to the left and right upper members by fixing the flattened double pipe portion to the back side of the diagonal cut portion, and the rear pipe is provided with the carrier mounting portion, the frame rear portion is configured. The number of welded parts can be reduced, and the rear structure of the frame can be made compact, which improves productivity. Frame structure of the straddle-type four-wheeled vehicle that can be achieved is provided.

According to the fifth aspect of the present invention, in the frame structure of the riding type four-wheeled vehicle having the structure in which the left and right lower members are connected by the cross members arranged at a plurality of positions in the front-rear direction, the left and right lower members are framed. Since the pipes of rectangular cross section protruding outward from the left and right from the positions at a predetermined interval in the front-rear direction at the center of the front-rear direction are fixed, the left and right footboards are fastened using the mounting holes formed in each pipe. It is possible to reduce the number of welding parts that make up the footboard and its attachment part, reduce the welding length and man-hours, and easily attach and detach the footboard to and from the frame, thereby producing. Provided is a frame structure for a riding type four-wheeled vehicle, which can improve the property.

According to the invention of claim 6, in a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a roof portion is provided at a front end portion of the frame. Since a cross member made of a flat plate for forming the above is used as the radiator upper part fixing bracket for fixing the upper part of the radiator, and the cross member covers between the radiator and the frame, the number of parts is reduced. With a small and compact structure, the radiator can be installed in a state protected from muddy water, and it is possible to reduce or prevent the inflow of hot air after passing through the radiator to the upper part of the vehicle body suitable for placing the intake air intake of the engine. A frame structure for a riding type four-wheeled vehicle is provided.

According to the invention of claim 7, in a frame structure of a riding type four-wheeled vehicle having a structure in which left and right lower members are connected by cross members arranged at a plurality of positions in the front-rear direction, approximately the center of the frame in the front-rear direction. The front engine cross member and the rear engine cross member that connect the left and right main lower members are provided at predetermined intervals in the front and rear of the engine mounting area, and these cross members are recessed in the center downward. It is made of a plate material with a cap-shaped cross-section, and the brackets that are attached to the engine in advance are fastened to these cross members to mount the engine. The engine can be installed and removed easily. Frame structure of the straddle-type four-wheel vehicle which can improve the workability of the mounting unloading and maintenance is provided.

[Brief description of drawings]

FIG. 1 is a left side view of a riding type four-wheeled vehicle having a frame structure to which the present invention is applied.

FIG. 2 is a plan view of the riding type four-wheeled vehicle of FIG. 1;

FIG. 3 is a perspective view showing an example of a frame structure of a riding type four-wheeled vehicle to which the present invention is applied.

4 is a perspective view of a steering upper mounting bracket of the frame of FIG. 3. FIG.

5 is a partial cross-sectional view taken along line 5-5 in FIG. 4 with the mounting components.

6 is a partial cross-sectional view of the fuel tank front mounting portion shown in FIG. 4 when assembled.

FIG. 7 is a partial perspective view showing a state in which a steering shaft upper bearing is attached to the bracket of FIG.

8 is a perspective view of a strut mounting bracket of the frame of FIG.

9 is a partial vertical cross-sectional view of the strut mounting portion in FIG. 8 when assembled.

FIG. 10 is a partial vertical cross-sectional view of the front fender support portion in FIG. 8 when assembled.

11 is a partial plan view showing a structure of a rear pipe connecting portion of the frame of FIG.

12 is a cross-sectional view taken along the line 12-12 in FIG.

13 is a partial cross-sectional view taken along the step member of the footboard mounting portion of the frame of FIG.

FIG. 14 is a partial cross-sectional view taken along the line 14-14 in FIG.

FIG. 15 is an exploded perspective view showing a radiator upper fixing bracket and a radiator of the frame of FIG.

16 is a vertical cross-sectional view taken along the line 16-16 in FIG.

FIG. 17 is a partial perspective view showing an engine front cross member and an engine rear cross member for mounting the engine lower part of the frame of FIG. 3;

FIG. 18 is a horizontal cross-sectional view showing a state in which the engine is attached to the engine front cross member of FIG.

19 is a cross-sectional view taken along the line 19-19 in FIG.

20 is a perspective view of the engine bracket in FIG. 18. FIG.

21 is a vertical cross-sectional view of a connecting unit that connects the front upper portion of the engine to the cross member of FIG.

[Explanation of symbols]

10 frame 11 engine 12 front wheel 13 rear wheel 15 handle 16 swing arm 18 front carrier 19 fuel tank 20 seat 21 rear carrier 22 footboard 23 front fender 24 tank cover 25 rear fender 27 strut 28 radiator 31 main upper member 32 main lower member 33 side member 34 side member 36 cross member (radiator upper fixing bracket) 37 cross member (strut mounting bracket) 38 cross member (steering upper mounting bracket) 44 cross member 45 cross member 49 rear end member (rear pipe) 51 engine guard 52 step Member 75 Subframe member 76 Engine removal Brackets 77 brackets 78 brackets 101 front fender mounting portion 102 fuel tank front mounting portion 103 steared shaft upper bearing mounting portion 104 ignition coil mounting portion 111 steering stopper 113 front fender support portion 114 front carrier rear mounting portion 115 regulator mounting portion 116 Strut mounting part 119 Regulator 120 Diagonal cut part 121 Double pipe part 122 Foot board mounting hole 128 Engine bracket 129 Engine mounting hole 133 Distance collar 134 Rubber damper 139 Engine mounting bolt 141 Engine mounting bolt 144 Rubber damper 145 Coupling bracket 146 Engine Front upper part 147 d Jin mounting bolts 151 intake air inlet of the roof portion 152 radiator mounting portion 155 rubber damper 157 radiator mounting bolts 160 engine

Claims (7)

[Claims] 1. In a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a cross member arranged at a front portion of a steering shaft is provided. Used as a steering upper part mounting bracket that supports the upper part, and to the bracket, a front fender mounting part, a fuel tank front mounting part, a tank cover mounting part, and a bearing mounting for fixing the upper bearing of the steering shaft. A frame structure for a riding type four-wheeled vehicle, which is characterized in that a portion and an engine mounting portion are provided. 2. The frame of a riding type four-wheel vehicle according to claim 1, wherein the bracket is further provided with a stopper for restricting a turning range of a steering shaft and an attachment portion of an ignition coil. Construction. 3. In a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, the cross members arranged at the front portion are arranged on the left and right sides. A riding type 4 characterized by being used as a strut mounting bracket for mounting an upper part of a strut for wheel suspension, wherein the bracket is provided with a front fender supporting portion, a front carrier mounting portion and a regulator mounting portion.
Wheel car frame structure. 4. In a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a pipe having a rectangular cross section is used as the upper member, Of the upper member is cut diagonally, both ends of the rear pipe connected to the rear ends of the left and right upper members are crushed and flattened into a double pipe, and the rear side of the diagonal cut portion is A frame structure for a riding type four-wheeled vehicle, characterized in that a rear pipe is connected to left and right upper members by fixing a flattened double pipe portion, and a carrier mounting portion is provided on the rear pipe. 5. In a frame structure of a riding type four-wheeled vehicle having a structure in which left and right lower members are connected by cross members arranged at a plurality of positions in the front and rear direction, the left and right lower members are provided at a substantially central portion in the front and rear direction of the frame. A riding type four-wheeled vehicle characterized in that pipes having a rectangular cross section protruding outward from the positions at predetermined intervals in the front-rear direction are fixed and the left and right footboards are fastened using the mounting holes formed in each pipe. Frame structure. 6. In a frame structure of a riding type four-wheeled vehicle having a structure in which left and right upper members are connected by cross members arranged at a plurality of positions in the front-rear direction, a flat cloth having a roof portion at a front end portion of the frame. A riding type four-wheel vehicle characterized in that a member is provided and the cross member is used as a radiator upper part fixing bracket for fixing the upper part of the radiator, and the cross member covers between the radiator and the frame. Frame structure. 7. In a frame structure of a riding type four-wheeled vehicle having a configuration in which left and right lower members are connected by cross members arranged at a plurality of positions in the front-rear direction, a front and rear of an engine mounting region at a substantially central portion of the frame in the front-rear direction. A cross member at the front of the engine and a cross member at the rear of the engine that connect the left and right lower members to each other at predetermined intervals are provided, and these cross members are recessed in the center. These plate members have a hat-shaped cross section with an inverted collar. A frame structure for a riding type four-wheeled vehicle, characterized in that a bracket, which is made of a molded product and is previously attached to an engine, is fastened to these cross members to mount the engine.