JP2784504B2 - Beam for subsoiler - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam for a subsoiler, and more particularly, to avoid concentration of stress on a cutting edge (edge) near an upper end of a beam body of the subsoiler. To a subsoiler beam.

[Conventional technology]

As shown in FIG. 6, a well-known conventional subsoiler inserts a beam body 1 (also referred to as a standard or shank) having a chisel attached to a lower end into the soil, and inserts it with a tractor. It is used for the purpose of regenerating cultivated soil by crushing the cultivated soil by towing or forming slits in the cultivated soil to supply oxygen to the cultivated soil.

A beam main body 1 constituting the sub-soiler has a cutting edge 2 on both left and right sides along a length direction thereof at a front end edge in a working direction.
Are formed, and so-called blades are formed, so that excavation of cultivated soil is facilitated and the excavation resistance when being pulled in the soil is reduced.

The blade edge 2 is symmetrical in front view and left and right, and the thickness of the blade gradually increases toward the rear in the work traveling direction. Has converged.

In the excavation work using the beam main body 1, when considering the bending moment applied to the beam main body 1, it is considered that an evenly distributed load is applied to the blade edge 2, and a quadratic curve is drawn as a bending moment diagram. The maximum moment distribution at the fulcrum can be considered.

[Problems to be solved by the invention]

Therefore, in the upper end portion 2A of the blade edge 2, the thickness as a member greatly changes, so that a notch is formed due to the material dynamics, and at the same time, since the notch is close to the support point of the beam main body 1, The stress caused by the load applied during excavation work is quite large, and in extreme cases, it may cause breakage.

Therefore, an object of the present invention is to provide a beam for a subsoiler that is free from breakage by minimizing stress concentration caused by a notch in a portion where the thickness of an upper end portion changes in forming a blade edge. It is assumed that.

[Means for solving the problem]

In order to achieve the above object, the present invention relates to a sub-soiler beam having blade edges 12 formed on both left and right front edges of a beam main body 10, wherein the upper end of the blade edge 12 is an upper end of the beam main body 10. The left and right sides are formed by asymmetric notches 13L and 13R in order to avoid stress concentration on the right and left sides.

[Action]

The beam for the subsoiler according to the present invention is formed by dispersing the stress concentration portions formed by the formation of the blade edge 2 into at least two places. Can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings. In these drawings, reference numeral 10 denotes a beam main body, a chisel 11 is attached to a lower end, and an attachment hole 11A for a subsoiler frame is drilled at an upper end. On both left and right front sides of the beam main body 10, a cutting edge 12 serving as a cutting edge is formed.
Is inclined to the left and right with the front edge as the center line, and becomes thicker toward the rear end, and the upper end of this blade edge draws a spherical surface with a radius r and approaches the side surface of the beam main body 10 ing.

The curved surface portion formed by the spherical surface constitutes a notch 13 in terms of material mechanics. On the left and right of the front edge of the blade edge 2, the position of the notch 13 L and 13 R in the longitudinal direction of the beam body 10. Are different. In other words, when the two notches 13L and 13R are close to each other, the interference phenomenon of the notches occurs, so that the strength is remarkably reduced, but the positions of the notches 13L and 13R are far apart. As a result, the stress can be dispersed, contributing to an increase in strength.

The shape of the notch 13 is the same as that shown in FIGS.
As shown in the side view and the front view shown in FIGS. 4 and 5,
The notch can be formed into a planar shape as well as a curved surface.

〔The invention's effect〕

As is apparent from the above description, the sub-soiler beam of the present invention is not asymmetrical by displacing the positions of the notches 13L and 13R in the upper part of the blade edge 2 in the height direction without disposing them in the same direction. Because of the configuration, the interference of the notches 13L and 13R generated by the load applied to the beam main body 10 can be avoided, and the effect of increasing the strength of the beam main body 10 can be expected.

[Brief description of the drawings]

FIG. 1 is a side view of a beam for a subsoiler of the present invention, and FIG.
FIG. 3 is a front view, FIG. 3 is a side view, FIG. 4 is a front view and a side view of a beam body according to another embodiment, and FIG.
The figure is a front view and a side view of still another embodiment, and FIG. 6 is a side view showing a conventional beam. 10 Beam main body, 11 Chisel, 12 Blade edge, 13 (13
L, 13R) …… Notch

Claims (1)

(57) [Claims] 1. A subsoiler beam having blade edges (12) formed on both left and right sides of a front edge of a beam main body (10), wherein the upper end of the blade edge (12) is connected to the upper end of the beam main body (10). Asymmetrical notches (13) to avoid stress concentration
L, 13R), characterized by a beam for subsoilers.