JPS631699A - Mounting support structure of boom derricking hydraulic cylinder in boom car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is used in the field of vehicles that raise and lower booms on the vehicle body, such as aerial work vehicles and crane vehicles.

('b) Prior Art Conventionally, a hydraulic cylinder used to raise and lower a boom on a vehicle body is pivotally supported by a mounting member fixed to the bottom surface of the boom, and the structure of the mounting member is shown in Figures 5 and 5. As shown in Figure 6, it consists of a connecting member (pull) and a reinforcing frame (02).

The connecting member (01) has a length L that is approximately the same as the width of the boom (03).
A pair of left and right brackets (05) (05) fixed to the center of the shaped member (04) and the L-shaped member (04) with an appropriate interval between them.
The negative side of the above-mentioned member (04) is connected to the boom (03).
) The hydraulic cylinder is fixed to the lower surface of the bracket (05), and one end of the hydraulic cylinder is inserted between the pair of brackets (05) (05), so that the hydraulic cylinder is pivotally supported by the brackets (05) (05).

In addition, the reinforcing frame (02) has the same width as the boom (03) and has a rectangular front (06) and triangular left and right sides (07) (0
7) is formed into a cross-sectional shape, and the upper edge is the boom (03)
On the underside, the trailing edge is fixed to an L-shaped member (04).

(C) Problems to be Solved by the Invention In the above structure, the push-up blade by the hydraulic cylinder acts on the L-shaped member through the bracket, and the L-shaped member tends to deform as shown by the dotted line in FIG.

However, since the front surface of the reinforcing frame corresponding to the point where the amount of deformation of the above-mentioned member is the largest, that is, the position close to the bracket, is flat, there is a stress concentration and the wall thickness is increased even in areas that do not require as much strength. This has the disadvantage of being extremely wasteful economically.

(d> Means for Solving the Problems The present invention solves the above-mentioned drawbacks. In a boom vehicle in which a boom provided on the vehicle body can be raised and lowered by a hydraulic cylinder, the bottom surface of the boom is A mounting member consisting of a connecting member and a reinforcing frame is provided, and the connecting member is provided with a pair of left and right brackets for supporting the hydraulic cylinder shaft fixed to the center of an L-shaped member fixed to the boom at appropriate intervals. The reinforcing frame has a trapezoidal front surface and triangular left and right side surfaces so that its cross section has an inverted trapezoidal outer edge, and the distance between the pair of left and right boundary lines between the front surface and the side surfaces gradually decreases toward the rear. At the same time, the rear end of each boundary line is brought close to each bracket, and the upper edge of the reinforcing frame is welded to the bottom surface of the boom, and the rear edge is welded to the L-shaped member. FIG. 1 shows an aerial work vehicle (1) using the present invention, in which a support (4) is erected on the vehicle body (2) via a swivel base (3), and the support (4)
) is rotatably supported by a telescoping boom (5), and a workbench (6) is provided at the tip of the boom (5).

A mounting member (6) of the present invention is fixed to the lower surface of the boom (5), and a hydraulic cylinder (7) for raising and lowering the boom (5) is provided between the mounting member (6) and the column (4). ing.

The mounting members will be explained below with reference to FIGS. 2 to 4.
The mounting member (6) consists of a connecting member (8) for pivotally supporting the hydraulic cylinder (7), and a reinforcing frame (9) for reinforcing the connecting member (8).

The connecting member (8) has a length L that is approximately the same as the width of the boom (5).
A pair of left and right brackets (11) (11
), the negative side of the L-shaped member (10) is welded to the bottom surface of the boom (5), and the tip of the hydraulic cylinder (7) is inserted between the pair of brackets (11).
) (11) holes (12) (12) and hydraulic cylinder (7)
The shaft (14) is inserted through (13).

The reinforcing frame (9) consists of a trapezoidal front surface (15) and triangular left and right side surfaces (16) (16), and has a cross section with an inverted trapezoidal outer edge. The distance between the pair of left and right boundaries (17) (17) formed by bending is gradually decreased toward the rear, and each boundary line (
17) Attach the rear end of (17) to each bracket (11) (11)
In addition, both sides (1B) (
The upper edges (18) (18) of the boom (1B) are formed to be parallel to the width of the boom (5) at approximately the same interval.

Both sides (16) (16) of the reinforcing frame (9) with the above structure
The upper edge (18) (18) is welded to the bottom surface of the boom (5), and the rear end is welded to the L-shaped member (10).
).

Brackets (11) (11) where concentrated stress is particularly likely to occur
), there is a curved boundary line (17) (17
), so the whole part does not need to be thick.In the example, we explained the case where it is used for an aerial work vehicle, but in a structure where the boom is raised and lowered on the body of a crane vehicle All can be used.

(f> Effects of the Invention As described above, the present invention forms a reinforcing frame with a trapezoidal front surface and a triangular left and right side surface, and gradually decreases the distance between the pair of left and right boundary lines between the front surface and the side surface toward the rear. By moving the rear end closer to the bracket of the connecting member, it is possible to increase the strength of the areas where concentrated stress occurs without increasing the overall thickness.In addition, the weight is reduced compared to conventional models, and the number of welding points is reduced. be able to.

[Brief explanation of drawings]

FIG. 1 is an overall view of the present invention applied to an aerial work vehicle, FIGS. 2 to 4 are enlarged views of the present invention, and FIGS. 5 to 6 are conventional examples. (5) is the boom, (6) is the mounting member, (7) is the hydraulic cylinder

Claims (1)

[Claims] In a boom vehicle in which a boom provided on a vehicle body can be raised and lowered by a hydraulic cylinder, a mounting member consisting of a connecting member and a reinforcing frame is provided on the lower surface of the boom, and the connecting member is fixed to the boom. A pair of left and right brackets for supporting the hydraulic cylinder shaft are fixed to the center of the shaped member at appropriate intervals, and the reinforcing frame has a trapezoidal front surface and triangular left and right side surfaces, and the cross section has an inverted trapezoidal outer edge. Form it as you like,
In addition, the distance between the pair of left and right boundary lines between the front and side surfaces is gradually decreased toward the rear, and the rear end of each boundary line is brought closer to each bracket, so that the upper edge of the reinforcing frame is on the lower surface of the boom, and the rear edge is L-shaped. A mounting support structure for a hydraulic cylinder for luffing on a boom vehicle, which is welded to each member.