JPH0542957Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a front frame structure of an articulated wheeled loader.

Prior Art Figure 4 shows a wheeled loader. The front frame a and rear frame b of the wheeled loader are pin-coupled at a center hinge c, and the wheeled loader turns by applying force to the steering cylinder pivot point e using the steering cylinder d.

In the conventional front frame structure, the front plate f, the side plate g, and the center hinge c form the main strength base material. Also, the axle mount part h that receives external force,
The boom cylinder mount part i, boom mount part j, and bucket cylinder mount part k of the working machine are connected to the front plate f, side plate g, and center hinge c, which are the main strength base materials, by welding or the like so that they can withstand external forces. ing.

In order to prevent deformation of the side plate f due to external force, a highly rigid center hinge c, a boom cylinder mount part i, a rib l from the axle mount part h,
m and n, and the thickness of the side plate g was increased.

Problems that the invention aims to solve However, when the ribs l, m, and n are erected, the stress concentration is extremely different due to variations in the manufacturing quality of the rib ends, and the quality is not stable. Also, as the loader becomes larger, the side plate The area of g has expanded and the deformed parts of the side plate g are the center hinge c, the boom cylinder mount part i, and the axle mount part h.
The effect of the ribs l, m, and n disappears as the distance increases.

Furthermore, when the thickness of the side plate g is increased, there is a disadvantage that the weight of the front frame becomes extremely heavy. Note that F ₁ to F 9 in FIG. ₉ are external forces.

The present invention was developed in view of the above circumstances, and its purpose is to provide a front frame structure for a wheeled loader that can prevent side plates from deforming, do not lose the effect of ribs, and is light in weight. It's about doing.

Means and Effects for Solving the Problems The present invention is constructed by connecting the left and right side plates 1 and 2 to each other by a connecting member 3, and providing left and right steering cylinder pivot points 4 and 5 on this connecting member 3. This prevents deformation of the left and right side plates 1 and 2.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 and 2 are the left and right side plates,
The left and right side plates 1 and 2 are connected to each other by a connecting member 3.

The connecting member 3 is provided with left and right steering cylinder pivot points 4 and 5.

That is, the left and right inner ring cylinder pivot points 4 and 5 are connected to each other by the connecting member 3, thereby preventing the side plates 1 and 2 from deforming.

Left and right steering cylinder pivot points 4 and 5
Bending moment M of B-B cross section when not connected
is M=F・A, and left and right steering cylinder pivot points 4 and 5
Bending moment of B-B cross section when connecting
M′ is M′=F・A ² /L ² (L-A) M′/M=A(L-A)/L ^2For an actual vehicle, L:A=4:1 Therefore, the bending moment M′ is A(L-A)/L ^twice the bending moment M, which is actually 3/16, which is about 1/5 of the bending stress.

Effects of the invention The invention is as described above, with left and right side panels 1,
2 are connected to each other by a connecting member 3, and left and right steering cylinder pivot points 4,
5, it is possible to prevent the left and right side plates 1 and 2 from deforming, and the effect of the ribs is not lost, and the problem of excessively increasing the weight of the front frame can be solved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. 1, Fig. 3 is an explanatory diagram of bending stress due to external force on the front frame, and Fig. 4 is a wheeled loader. 5 is a sectional view taken along the line of FIG. 4, FIG. 6 is a plan view of the conventional front frame, FIG. 7 is a sectional view taken along the line of FIG. FIG. 9 is an explanatory view showing the direction in which external force is applied to the front frame. 1 and 2 are side plates, 3 is a connecting member, and 4 and 5 are steering cylinder pivot points.

Claims (1)

[Scope of utility model registration request] A front frame structure for a wheeled loader, characterized in that left and right side plates 1 and 2 are connected to each other by a connecting member 3, and left and right steering cylinder pivot points 4 and 5 are provided on the connecting member 3.