JPH0529256Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is a system in which the mounting frame of a ram cylinder with a lock valve attached to the upper end is bolted onto screw seats fixed to the left and right side ends of the chassis frame. The present invention relates to a mounting structure for a ram cylinder in a wheel-type hydraulic excavator that is fastened by a ram cylinder.

(b) Prior art Figure 5 shows an example of a wheel-type hydraulic excavator, and its chassis frame (traveling body frame) 1
A front axle 2 is supported at the front, a rear axle 3 is supported at the rear, and a rotating body 4 is rotatably mounted at the center. A driver's cab 5 is installed at the front of the revolving body 4, and a working machine (front attachment) 6 is attached thereto.

Next, the axle rocking device on the front axle 2 side will be explained with reference to FIG. 6, and the conventional ram cylinder mounting structure will be explained with reference to FIGS. 7 and 8.

Wheels 6 are attached to the left and right ends of the front axle 2, respectively, and a beam 7 is attached to the intermediate portion with bolts 8. beam 7
The central portion of the chassis frame 1 is swingably connected to the chassis frame 1 by a center pin 9.

Screw seats 10 are symmetrically fixed to the left and right side ends of the chassis frame 1 by welding, and a ram cylinder 11 is fastened to the screw seats 10 by the following structure. That is, the screw seat 10 is provided with an upper receiving surface 10a and a side mounting surface 10b which are orthogonal to each other by machining, and a screw hole 10c is provided in the horizontal direction. Mounting frame 11 of ram cylinder 11
An upper mounting surface 11b to be received by the upper receiving surface 10a of the screw seat 10 is formed at the upper end of a, and a side mounting surface 10b of the screw seat 10 is formed at the side part.
A lateral mounting surface 11c is formed to be in contact with the lateral mounting surface 11c.
Further, the mounting frame portion 11a is provided with a bolt hole 11d that matches the screw hole 10c of the screw seat 10. Bolt 12 has bolt hole 11d and screw hole 10
It is inserted into c. The upper end surface of the ram cylinder 11 is machined, and a lock valve 14 is attached to the upper end surface.

During running, one wheel 6 rides on the protruding ground as shown in the right half of FIG. 6, and the axle 2 swings about the center pin 9. Note that the left half of FIG. 6 shows a state in which the wheels 6 are rolling on a flat ground.

(c) Problems to be solved by the invention In the conventional ram cylinder mounting structure described above, the upper receiving surface 10a and the side mounting surface 10b of the screw seat 10 are machined to improve their flatness and both sides. It is necessary to obtain mutual perpendicularity. The same applies to the upper mounting surface 11b and the side mounting surface 11c of the mounting frame portion 11a of the ram cylinder 11. In addition, the lifting load F from the front axle 2 is
Since the load is borne by the upper receiving surface 10a and the bolt 12, the left and right mounting accuracy of the screw seat 10 is required, and the upper receiving surface 10a and the upper mounting surface 11b
If the pressure-receiving area is not increased, there is a risk that the surface will be damaged due to insufficient surface pressure against the uplift load F.

The purpose of this invention is to install a ram cylinder that does not require machining of the ram cylinder receiving surface and the side mounting surface of the screw seat in the chassis frame, and can expand the pressure receiving area of the upper end surface of the ram cylinder. The purpose is to provide structure.

(d) Means for solving the problem This invention is aimed at achieving the above-mentioned purpose, and consists of a ram with a lock valve attached to the upper end surface, which is mounted on a screw seat fixed to the left and right side ends of the chassis frame. In a ram cylinder mounting structure for a wheel-type hydraulic excavator in which the cylinder mounting frame is fastened with bolts, a receiving surface is provided at the side end of the upper plate of the chassis frame to bring the upper end surface of the ram cylinder into contact. The present invention is characterized in that an angular protruding seat is integrally provided at the upper end portion on the side of the mounting frame portion to enlarge the contact area with the receiving surface portion of the chassis frame.

(e) Effect The lifting load from the axle is transmitted through the upper end surface of the angular protruding seat and a part of the upper end surface of the ram cylinder.
It can be received on the receiving surface of the chassis frame.

(f) Example The following is an example of this invention as shown in Figures 1 to 4.
This will be explained using figures. In these figures, the same reference numerals as in FIGS. 6 to 8 represent the same or equivalent items.

Note that the lock valve 14 is omitted in FIG. 4.

The chassis frame 1 has a slightly thicker wall thickness, and a receiving surface portion 1a is provided at the side end portion of the upper plate, with which the upper end surface of the ram cylinder 11 comes into contact. The lateral mounting surface 11c of the mounting frame portion 11a of the ram cylinder 11 is in contact with the lateral mounting surface 10b of the screw seat 10 fixed to the lateral end of the chassis frame 1. It is fastened to a screw seat 10 with a bolt 12 and a washer 13 in the same manner as the above. The side mounting surface 11c of the mounting frame portion 11a of the ram cylinder 11 is machined, but the receiving surface 1 of the chassis frame 1 is
a and the side mounting surface 10b of the screw seat 10 are made of rolled material, so no machining is required. An angular protruding seat 11e is integrally provided on a portion of the upper end side of the ram cylinder 11 to expand the pressure receiving area with respect to the receiving surface portion 1a of the chassis frame 1. The upper end surface of the ram cylinder 11 is the lock valve 1.
4 is machined with good accuracy, the perpendicularity between that surface and the side mounting surface 11c is sufficiently guaranteed.

The lifting load F from the front axle 2 is received by the receiving surface portion 1a of the chassis frame 1 via the upper end surface 11f of the angular protruding seat 11 and a part of the upper end surface of the ram cylinder 11.

(g) Effects of the device According to the device explained above, the following effects can be obtained.

(1) Since the pressure receiving area of the upper end surface of the ram cylinder relative to the receiving surface of the chassis frame is increased, the surface pressure against the lifting load from the axle can be reduced.

(2) Since the screw seat can be made of rolled square material, machining of the side mounting surface is not required.

(3) If the upper plate of the chassis frame is made thicker and the screw seats are installed based on the receiving surface, there will be no practical problem with the precision of the rolled plate and no machining will be required.

(4) Costs can be reduced by eliminating the need for machining the screw seat and the side mounting surface of the ram cylinder mounting frame.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view showing an embodiment of this invention, Fig. 2 is a right side view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a cross-sectional view of Fig. 2. , 5th
Figure 6 is a side view showing an example of a wheel-type hydraulic excavator, Figure 6 is a front view showing the rocking device of the front axle of the wheel-type hydraulic excavator, and Figure 7 shows a conventional ram cylinder mounting structure in a wheel-type hydraulic excavator. The sectional front view shown in FIG. 8 is a right side view of FIG. 7.

Claims (1)

[Scope of utility model registration request] In the ram cylinder mounting structure of a wheel-type hydraulic excavator, the mounting frame of the ram cylinder with a lock valve attached to the upper end face is fastened with bolts to the screw seats fixed to the left and right side ends of the chassis frame. A receiving surface portion is provided at the side end of the upper plate to bring the upper end surface of the ram cylinder into contact with the upper end surface of the ram cylinder, and an angular protrusion is provided at the upper end portion of the ram cylinder on the mounting frame side to enlarge the contact area with the receiving surface portion of the chassis frame. A ram cylinder mounting structure characterized by an integrated seat.