JPH0529191Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting structure for a differential case of a straddle type vehicle for rough terrain.

(Prior Art) As shown in FIGS. 3 to 5, a straddle-type vehicle 1 for rough terrain generally has a straddle-type seat 2 and a frame 3 made of a metal tube extending back and forth. Front and rear wheels 4,
An engine 6 is mounted approximately in the center of the frame 3, and two front wheels 4, 4, which are operated by a bar handle 7, are supported at the front end of the frame 3 via a suspension system 8, and a differential independent of the engine 6 is mounted on the front end of the frame 3. A differential case 9 is supported via a suspension bracket 10 having an inverted U-shaped cross section, a suspension control arm 11 is pivotally connected to the suspension bracket 10 by a support shaft 12, and the engine 6 is supported by the differential case 9. The structure is such that the front wheels 4 are driven through.

By the way, in the conventional mounting structure of the differential case 9, as shown in FIGS. 6 and 7, a differential case bracket 13 is interposed between the differential case 9 and the suspension bracket 10. It had been. This differential case bracket 13 has two tubular spacers 16 welded between two long and short support plates 14 and 15 whose upper ends are welded to the suspension bracket 10, and which are inserted into the tubular spacers 16. bolt 17 and nut 18 screwed into it
The intermediate support plate 19 is connected to the short support plate 15, and the differential case 9 is connected to the bolts 20 between the lower ends of the long support plate 14 and the intermediate support plate 19.
It was removably supported by a nut 21 screwed onto it. This is the 62nd year of the Utility Model that shows this general differential case mounting structure.
There are issues such as No. 92507.

(Problem to be solved by the invention) However, the above conventional differential case 9
According to the mounting structure shown in FIG. Due to welding, the suspension bracket 10 was thermally deformed, making it difficult to pivot the suspension control arm 11 in some cases.

The present invention has been developed in view of these conventional disadvantages, and it is intended to facilitate the attachment and detachment of the differential case 9 and eliminate welding deformation of the suspension bracket 10 by eliminating the conventional welded parts. The purpose is to

(Means for Solving the Problem) The means taken by the present invention to solve the above points is that the engine is mounted approximately in the center between the front and rear wheels of a frame that extends back and forth, and has a straddle-type seat. Two front wheels operated by a bar handle are supported at the front end of the frame via a suspension system, and a differential case independent from the engine has a suspension bracket having an inverted U-shaped cross section. A suspension control arm is pivotally connected to the suspension bracket by a support shaft, and the vehicle is a straddle type vehicle for rough terrain in which the engine drives the front wheels via the differential case. . A differential case bracket is interposed between the differential case and the suspension bracket, and the differential case bracket is attached to an upper surface portion extending in the horizontal direction and to both left and right ends of the upper surface portion. The bracket body has a cross-sectional shape of an inverted U-shape formed of a pair of left and right vertical plate parts, and a cylindrical member fixed to the upper surface part of the bracket body and extending in the longitudinal direction of the vehicle body. Further, a differential case is sandwiched within the open lower end of the bracket main body. The cylindrical member is provided with an insertion hole extending in the longitudinal direction of the vehicle body, and the cylindrical member is inserted into the suspension bracket together with a plate spacer in contact with an end surface of the cylindrical member. Further, a fastening member insertion hole is formed in the plate spacer at a position opposite to the insertion hole of the cylindrical member, and the fastening member is inserted through the fastening member insertion hole of the plate spacer and the insertion hole of the cylindrical member. The plate spacer and the differential case bracket are integrally assembled to the suspension bracket.

(Function) In the above configuration of the present invention, when removing the differential case, the fastening member that integrally assembles the plate spacer and the differential case bracket to the suspension bracket and the differential case are removed from the bracket body. For example, remove the bolts and nuts that are clamped on the frame, pull out the plate spacer downward, remove the differential case bracket downward, and then remove the differential case to the outside of either the left or right side of the frame. I will do it. Furthermore, when installing the differential case, the procedure for removing the case is reversed. in this way,
When the plate spacer and differential case bracket are removed, a free space is created inside the suspension bracket, so the differential case can be moved freely within this free space, allowing the differential case to be moved left and right. This means that it can be attached and detached from any direction.
Furthermore, since the differential case bracket is fixed to the suspension bracket by a fastening member, there is no welding part required in the past, and the suspension bracket does not become deformed due to welding. There is no risk that it will be difficult to put on.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

This embodiment, like the conventional one, is applied to the rough terrain straddle type vehicle 1 shown in FIGS. 3 to 5. To explain its configuration, the rough terrain straddle type vehicle 1 is , has a straddle-type seat 2, an engine 6 is mounted approximately in the center between the front and rear wheels 4 and 5 of a metal tube frame 3 extending back and forth, and is operated by a bar handle 7 at the front end of the frame 3. Front 2 wheels 4,4
is supported via a suspension device 8, and a differential case 9 independent from the engine 6 is supported via a suspension bracket 10 having an inverted U-shaped cross section. 11 is pivotally mounted by a support shaft 12, and the engine 6 drives the front wheels 4 via a differential case 9.

In the uneven terrain saddle type vehicle 1 having the above configuration, the mounting structure of the differential case 9 of this embodiment is as shown in FIGS. 1 and 2.
A differential case bracket 30 is interposed between the differential case 9 and the suspension bracket 10.

The differential case bracket 30 has an inverted U-shaped cross-sectional shape consisting of an upper surface portion 31a extending in the horizontal direction and a pair of left and right vertical plate portions 31b formed at both left and right ends of the upper surface portion 31a. The bracket main body 31 has two tubular spacers 32, 32 which are cylindrical members on the upper surface of the upper surface portion 31a of the bracket main body 31.
is welded so as to extend in the same direction as the support shaft 12 (vehicle body longitudinal direction). The differential case bracket 30 has a mounting portion formed at the upper end of the differential case 9 at its lower end, which is fastened with a bolt 33 and a nut 34 screwed thereto. It's stuck. Further, the tubular spacer 32 has an insertion hole 32a extending in the longitudinal direction of the vehicle body. This tubular spacer 32 is
A plate spacer 35 is abutted against the front end surface thereof and inserted into the inside of the suspension bracket 10 together with the plate spacer 35. Further, the plate spacer 35 has an insertion hole 32 of the tubular spacer 32.
A fastening member insertion hole 35a is formed at a position opposite to a, and the suspension bracket 10 has an insertion hole 32a for the tubular spacer 32.
An insertion hole (not shown) is formed in the plate spacer 35 at a position opposite to the fastening member insertion hole 35a.

Then, in a state where the tubular spacer 32 and the plate spacer 35 are in contact with each other and inserted into the suspension bracket 10 as described above, the insertion hole of the suspension bracket 10 and the fastening member insertion hole of the plate spacer 35 are inserted. 35a and the insertion hole 32a of the tubular spacer 32, a bolt 36 constituting the fastening member 38 is inserted, and a nut 37 constituting the fastening member 38 is screwed onto the bolt 36, thereby connecting the plate spacer 35 and the differential case. A bracket 30 is integrally assembled to the suspension bracket 10.

Incidentally, the plate spacer 35 is provided with a hook hole 39 for easy attachment and detachment.

Next, the operation of this embodiment having the above configuration will be explained.

When removing differential case 9,
Remove the two fastening members 38 and the bolts 33 and nuts 34 that fasten the differential case, pull out the plate spacer 35 downward using the hook hole 39, and remove the differential case bracket 30. After removing it downward, the differential case 9 is removed to the outside of either the left or right side of the frame 3. Furthermore, when installing the differential case 9, the procedure for removing the differential case 9 may be reversed. In this way, free air is created inside the suspension bracket 10 at the site where the plate spacer 35 and the differential case bracket 30 have been removed, so the differential case 9 is removed within this free space.
can be moved freely, and the differential case 9 can be attached and detached from either the left or right direction, and this attachment and detachment work can be easily performed. Note that, since the differential case bracket 30 is fixed to the suspension bracket 10 by the fastening portion 38, the suspension bracket 10 will not be deformed by welding as in the conventional case, and the suspension control arm 11 will not be deformed by welding. There is no risk of difficulty in pivoting.

(Effects of the invention) As described above, the present invention provides the cylindrical member of the differential case bracket with an insertion hole extending in the longitudinal direction of the vehicle body, and also provides the cylindrical member with a plate spacer in contact with the end surface of the cylindrical member. The plate spacer is inserted into the inside of the suspension bracket, and a fastening member insertion hole is formed in the plate spacer at a position opposite to the insertion hole of the cylindrical member, and the fastening member insertion hole of the plate spacer and the insertion hole of the cylindrical member are formed. Since the plate spacer and differential case bracket are integrally assembled to the suspension bracket by inserting the fastening member through the suspension bracket, the suspension bracket will be left behind when the plate spacer and differential case bracket are removed. A free space is created inside the differential case, and the differential case can be moved freely within this free space.This means that the differential case can be installed and removed from either the left or right direction, making this installation and removal work easier. can be done. Furthermore, since the suspension bracket does not have a conventional welded part, thermal deformation is suppressed and there is no problem in attaching and detaching the suspension control arm.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a front view showing the mounting structure of the differential case of the uneven terrain straddle type vehicle of the present invention;
The figure is a sectional view taken along the - line in Figure 1, Figure 3 is a plan view of the straddle-type vehicle for rough terrain, Figure 4 is a side view of its front part, and Figure 5 shows the peripheral area of the differential case. 6 is a front view showing a conventional differential case mounting structure, and FIG. 7 is a sectional view taken along the line - in FIG. 6. 1... Straddle type vehicle for rough terrain, 2... Straddle type seat, 3... Frame, 4... Front wheel, 5... Rear wheel,
6... Engine, 7... Bar handle, 8... Suspension system, 9... Differential case, 10...
...Suspension bracket, 11...Suspension control arm, 12...Spindle, 30
...Differential case bracket, 31...
...Bracket body, 31a...Top surface part, 31b...
... Vertical plate part, 32 ... Tubular spacer (cylindrical member),
32a...Insertion hole, 35...Plate spacer, 35a
... Fastening member insertion hole, 38 ... Fastening member.

Claims (1)

[Claims for Utility Model Registration] Two front wheels that have a straddle-type seat, have an engine mounted approximately in the center between the front and rear wheels of a frame that extends back and forth, and are operated by a bar handle at the front end of the frame. is supported via a suspension system, and a differential case independent from the engine is supported via a suspension bracket having an inverted U-shaped cross section, and a suspension control arm is supported on the suspension bracket. In a straddle-type vehicle for rough terrain that is pivotally mounted by a shaft and in which the engine drives the front wheels via the differential case, a differential case is provided between the differential case and the suspension bracket. A bracket is interposed therebetween, and the differential case bracket has an inverted U-shaped cross-sectional shape, and includes an upper surface portion extending in the horizontal direction and a pair of left and right vertical plate portions formed at both left and right ends of the upper surface portion. It has a main body and a cylindrical member fixed to the upper surface of the bracket body and extending in the longitudinal direction of the vehicle body, a differential case is sandwiched in the open lower end of the bracket body, and the cylinder The shaped member has an insertion hole extending in the longitudinal direction of the vehicle body, and is inserted into the suspension bracket together with a plate spacer in contact with an end face of the plate spacer, and the plate spacer has an insertion hole of the cylindrical member. A fastening member insertion hole is bored at a position opposite to the plate spacer, and the fastening member is inserted through the fastening member insertion hole of the plate spacer and the insertion hole of the cylindrical member, and the plate spacer and the differential case bracket are suspended. A mounting structure for a differential case of a straddle-type vehicle for rough terrain, characterized in that the differential case is integrally assembled with a shock absorber bracket.