JPH0120198Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Technical Field) This invention relates to a structure for mounting a support bracket on a hoist cylinder, tension arm, etc. of a dump truck.

(Prior Art) Chassis frames are generally made of a steel plate with the minimum thickness necessary in terms of running stability and strength of the vehicle. For example, FIG. 7 shows an example of a chassis frame 51 having a U-shaped cross section, and FIG. 8 shows an example of a chassis frame 52 having a rectangular cylindrical shape.

The chassis frame that serves as the base for dump trucks is also similar. The frame of a dump truck is usually formed by press molding, and the use of thick steel plates specifically for dump trucks is not normally done because productivity deteriorates extremely. Under these conditions, in order to support the base end rotation shaft of the dump truck's hoist cylinder, tension arm, etc., it is necessary to use the chassis frame to support the load when the dump truck's bed is tilted. It is necessary to reinforce the mounting part and the bracket mounting part that supports the rotating shaft.

For example, in a frame 51 with a U-shaped cross section as shown in FIG. It is box-shaped. In addition, such an example is published in Japanese Unexamined Patent Publication No. 1983
This is disclosed in FIGS. 4 and 5 of Japanese Patent No.-11952. Furthermore, as shown in FIG. 10, it has been common practice to attach a reinforcing member 54 separate from the frame 52 to a frame 52 having a box-shaped cross section. Brackets are then attached to the frames 51, 52 reinforced in this way.

Furthermore, conventionally, in order to ensure both rigidity and strength of the bracket mounting portion, it is common to additionally weld a thick steel plate to the back side of the reinforcing members 53 and 54.

(Problem to be solved by the invention) In the conventional technology, the load applied to the hoist cylinder, tension arm, etc. is supported by the bracket and the chassis frame.
With the above-mentioned conventional bracket mounting structure, the load is concentrated on the contact area between the bracket and the chassis frame, which may cause cracks to occur in the contact area or the bracket to be screwed onto the mold surface of the chassis frame. There was a risk that the bolts could be damaged.

Further, in the conventional structure, the reinforcing member had to be generally large in size, resulting in poor productivity and many problems in terms of quality control.

This idea solves the above problems with a mounting structure that is different from the conventional mounting structure, and has a simple structure that can sufficiently withstand large loads applied to the bracket, as well as a compact structure with excellent productivity. is intended to provide.

Structure of the invention (means for solving the problem) In order to solve the above-mentioned problem, this invention has a hoist cylinder, a tension arm, etc. attached to the inner wall of the chassis frame, which is formed into a rectangular cylindrical cross section, at the base end. A bracket is provided to rotatably support the rotation shaft,
A hoist cylinder, tension arm, etc. of a dump truck characterized by passing at least two bolts through a bracket and a chassis frame having a square cylindrical cross section, and clamping and tightening the bracket and chassis frame with the bolts and nuts. The gist is the mounting structure of the support bracket.

(Function) That is, a bolt for fixing the chassis frame whose cross section is formed into a rectangular cylindrical shape is passed through the bracket and the chassis frame. and,
By clamping and tightening the bracket and chassis frame with the same bolt and nut, the load applied to the bracket is dispersed to the outer wall of the chassis frame, and the load applied to the bracket is supported by the entire chassis frame. be.

(Example) A preferred example embodying this invention will be described below with reference to the drawings.

Figure 1 shows the structure of a hoist link that tilts a vessel floor installed in a dump truck, and the base end sides of the hoist cylinder 1 and tension arm 2 are each rotatably supported on a chassis frame 3 having a rectangular cylindrical cross section. has been done. Further, the base end of the lift arm 4 is rotatably supported by a frame 6 provided on the lower surface of the vessel floor 5. On the other hand, the piston rod 1a of the hoist cylinder 1 is rotatably connected to a substantially intermediate position of the lift arm 4, and the tip of the tension arm 2 is rotatably connected to the tip of the lift arm 4. ing. The vessel floor 5 is rotatably connected via a hinge 7 to a vessel rotating shaft 8 attached to the chassis frame 1.

By driving the hoist cylinder 1, the vessel floor 5 can be tilted about the vessel rotation axis 8 within the range shown in FIGS. 1 and 2.

On the other hand, as shown in FIG. 3, the base end of the hoist cylinder 1 is fixed to a trunnion 9, and its trunnion shaft 10 is rotatably supported by a trunnion bracket 11 fixed to the chassis frame 3. There is. Further, the base end of the tension arm 2 is rotatably connected to a rotation shaft 12.
Both ends thereof are rotatably supported by tension arm brackets 13 which are also fixed to the chassis frame 3.

Next, the mounting structure of the trunnion bracket 11 will be explained.

As shown in Figure 4, trunnion bracket 1
1 is disposed on the inner wall of the chassis frame 3 having a rectangular cylindrical cross section via a trunnion stay 14, and bolt insertion holes 15 are formed at the four corners. As shown in FIG. 6, the trunnion stay 14 has a bolt insertion hole 16 formed therein corresponding to the bolt insertion hole 15 of the trunnion bracket 11, and its outer periphery is fixed to the chassis frame 3 by welding. ing.

A sleeve 17 is provided through the chassis frame 3, which has a rectangular cylindrical cross section to which the trunnion stay 14 is fixed, so as to communicate with the bolt through hole 16 of the trunnion stay 14, and is fixed to the chassis frame 3 by welding. There is.

The tightening bolt 18 is inserted through the bolt insertion hole 15 of the trunnion bracket 11, passes through the sleeve 17, projects to the outer wall of the chassis frame 3, and is screwed into the tightening nut 19. And the trunnion bracket 11 is this bolt 18
and nuts 19 are tightened and fixed to the chassis frame 3.

Next, the mounting structure of the tension arm bracket 13 will be explained.

As shown in FIG. 5, the tension arm bracket 13 is disposed on the inner wall of the chassis frame 3 via a tension arm stay 21, and bolt insertion holes 22 are formed at the four corners. The tension arm stay 21 is attached to the tension arm bracket 13 as shown in FIG.
The bolt insertion hole 23 corresponds to the bolt insertion hole 22 of
is formed, and its outer peripheral edge is welded and fixed to the chassis frame 3.

The tension arm stay 21 is attached to the chassis frame 3 to which the tension arm stay 21 is fixed.
The sleeve 2 is connected so as to communicate with the bolt insertion hole 23 of the sleeve 2.
4 is installed through the chassis frame 3 and is fixed to the chassis frame 3 by welding.

The tightening bolt 25 is inserted through the bolt insertion hole 22 of the tension arm bracket 13, passes through the sleeve 24, projects to the outer wall of the chassis frame 3, and is screwed into a tightening nut 26. The tension arm bracket 13 is tightened and fixed to the chassis frame 3 using the bolts 25 and nuts 26.

As described above, in this embodiment, the tightening bolt 18 for fixing the trunnion bracket 11 passes through the chassis frame 3 having a rectangular cylindrical cross section, and the tightening nut 19 is screwed onto the outer wall side of the frame 3 to secure the trunnion bracket. 11 is tightened and fixed to the chassis frame 3, the load applied to the trunnion bracket 11 is reduced by the bolt 1.
8 to the outer wall of the chassis frame 3.

Therefore, the load applied to the bracket 11 is not concentrated on the contact area between the bracket 11 and the chassis frame 3, but is received by the entire chassis frame 3, so that the trunnion bracket 11 and the chassis frame 3 absorb the large load applied to the bracket. can withstand sufficiently.

Similarly, the tightening bolt 25 for fixing the tension arm bracket 13 also passes through the chassis frame 3, which has a rectangular cylindrical cross section, and the tightening nut 26 is screwed onto the outer wall side of the frame 3 to fix the tension arm bracket 13. Since it is tightened and fixed to the chassis frame 3, the load applied to the tension arm bracket 13 is distributed to the outer wall of the chassis frame 3 via the bolts 25.

Therefore, the load applied to the tension bracket 13 is received by the entire chassis frame 3 without being concentrated on the abutment area between the bracket 13 and the chassis frame 3, as described above, so that the load applied to the tension arm bracket 13 and the chassis frame 3 is 3 can sufficiently withstand a large load applied to the bracket.

Effects of the invention As detailed above, according to the invention, with a simple structure, the large load applied to the bracket is absorbed by the entire frame, which has a rectangular cylindrical cross section, so that it can sufficiently withstand the large load applied to the bracket. In addition, since the reinforcing member does not need to be enlarged, productivity can be increased, and it has excellent effects in terms of quality control.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing the structure of a hoist link for tilting the vessel floor of a dump truck that embodies this idea, Figure 3 is a plan view of the same, and Figure 4 shows how the trunnion bracket is installed. 5 is a sectional view showing how the tension arm bracket is installed, FIG. 6 is a front view showing how the trunnion stay and tension arm stay are installed, and FIGS. 7 and 8 are views of the conventional chassis. The sectional views of the frame, FIGS. 9 and 10, are also sectional views of a conventional reinforced chassis frame. 1 is a hoist cylinder, 2 is a tension arm, 3 is a chassis frame, 4 is a lift arm, 5
1 is a vessel floor, 6 is a frame, 9 is a trunnion, 11 is a trunnion bracket, 13 is a tension arm bracket, 18 and 25 are tightening bolts, and 19 and 26 are tightening nuts.

Claims (1)

[Scope of utility model registration request] A bracket for rotatably supporting the base end rotation shaft of a hoist cylinder, tension arm, etc. is provided on the inner wall of the chassis frame, which has a square cylindrical cross section, and at least two bolts are connected to the bracket and the cross section. A mounting structure for a support bracket in a hoist cylinder, tension arm, etc. of a dump truck, characterized by penetrating a square cylindrical chassis frame and clamping and fixing the bracket and chassis frame using the same bolts and nuts.