JPS58138838A - Tooth - Google Patents

Abstract

PURPOSE:To obtain both wear resistace and toughness by a method in which the shaped bottom side of the fitting part of a shovel loader is divided and the divided bottom side is made harder. CONSTITUTION:The upper part 3 and basal part 6 of a U-shaped fitting part 2 are made of a material having higher toughness, and the tip end 1 is also hardened. Also, the bottom 4' of the U-shaped fitting part 2 is hardened and a bolt hole 5' is provided. By this, the wearing of the part from the tip 1 to the bottom 4' of the tooth is equalized. Thus, the tooth 1 having a long life can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in teeth used in shovel loaders and the like, and particularly to teeth that are easier to manufacture, more resistant to breakage, and have improved wear resistance.

Teeth used in shovel loaders and the like are required to have wear resistance and strength against bending force.

Furthermore, as a property of metal materials, wear-resistant (high hardness) materials have low strength against bending force and are easily broken, whereas materials that are strong against bending force and have excellent toughness are easily worn out.

BACKGROUND OF THE INVENTION Conventional teeth used in shovel loaders and the like have a structure as shown in FIGS. 1 to 3 to provide wear resistance and strength against bending force. That is, in the case shown in FIG. 1, only the tip 1 of the tooth, which is most likely to wear out, is hardened by a special quenching process, and the upper part 3 and bottom part 4 of the mounting part 2 and the root part of the tooth tip are formed into a U-shape. 6 is made of a material with excellent toughness. In the case shown in FIG. 2, the entire tooth is hardened and only wear resistance is considered.

Further, in the case shown in FIG. 3, the surfaces of the tip 1 and the bottom 4 are hardened.

The tooth thus hardened was fitted onto the tip of the packet at the U-shaped mounting portion 2, and a bolt was inserted into the bolt hole 5 provided in the tooth to fix the tooth to the tip of the packet.

However, in the case of Fig. 1, the bottom part 4 of the mounting part wears out faster than the tooth tip 1, and the head of the bolt also wears out at the same time, making it impossible to maintain the fixed state between the packet tip and the tooth. Although the tip 1 can still be used satisfactorily, it becomes unusable, resulting in a disadvantage that the life of the tooth itself is shortened.

In addition, in the case of Fig. 2 in which the entire part is hardened, when the tip 1 of the tooth or the tip 1 of the tooth that scoops up the object to be processed touches the ground, bending force is applied to the top 3 or bottom 4 of the mounting part, causing it to break at that part. The disadvantage is that this situation often occurs.

In addition, the surfaces of the tooth tip 1 and the bottom 4 are partially hardened,
In the case of Fig. 3, in which a part of the bottom part 4 is made tough to prevent breakage, it is very difficult to harden the bottom part 4 partially and uniformly due to manufacturing reasons. However, this had the disadvantage that it did not provide toughness to the steel, and eventually breakage occurred in this area.

The present invention aims to solve these conventional drawbacks and provide a tooth that has both wear resistance and toughness.

That is, the present invention divides the U-shaped bottom of the attachment part or a part thereof, hardens the divided parts, and with the tooth fitted and fixed at the tip of the packet, partially cuts from the tip of the tooth to the bottom. It is characterized by being cured.

The details will be explained below using the embodiment shown in FIG. In the figure, the upper part 3 and root part 6 of the U-shaped attachment part 2 are made of parts with excellent toughness, and the tip 1 is hardened. Further, the bottom part 4 of the U-shaped attachment part 2 is separated at the base part 6 and fitted at a fitting part 7, as shown in the bottom view of FIG. Also, this bottom part 4 is hardened like the tip part 1. As another embodiment, as shown in FIGS. 7 and 8, the bolt hole 5' portion of the bottom portion 4 is divided into parts L7 and hardened as separate members 4'. Also bolt hole 5'
is a tapped hole.

The operation of this embodiment configured as described above will be explained next. The progress of tooth wear will be explained with reference to FIG. In the figure, the tooth wears uniformly from the tip 1 to the bottom 4 as indicated by A, ′-“, and No. Along with this wear, since the bolt is screwed into the bottom 4, the bolt also wears out along with the bottom s4. Although it wears out, the screwed state is maintained as it is.Also, the parts that break due to bending force are the top part 3 and the base part 7.8 of the bottom part 4 of the U-shaped mounting part 2, as shown in the figure. 5, since the material from the base 6 to the top 3 is made of a material with excellent toughness, there will be no breakage at the part 7 shown in FIG. 6. When bending force is applied to the bottom 4, the bottom 4 is bent at the fitting part 7 to escape the bending force.Furthermore, when bending force is applied to the bottom part 4 of the embodiment shown in FIG.
Since a material with excellent toughness is arranged from the root part 6 to the bottom part 4, it has sufficient strength against bending force.

As detailed above, according to the present invention, the bottom part of the U-shaped attachment part of the tooth is divided and the divided part is hardened, so that the wear from the tip to the bottom of the tooth is uniform. Since the divided bottom portions are screwed together, the tooth remains fixed. Furthermore, by dividing the bottom part, the hardening process or the tough part of the bottom part can be performed as designed, and the split mating part will bend and escape against bending force, or the tough part will bend. It can maintain its full strength and will not break. Therefore, the wear and breakage required for teeth can be solved at the same time, and there is an excellent effect that teeth with a long life can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples. Figure 1 shows only the tip of the tooth, Figure 2 shows the entire tooth, and Figure 3 shows a tooth that has been hardened from the tip to the bottom. Fig. 4 is an explanatory diagram showing the state of wear progress, Fig. 5 is a longitudinal side view.
Figures V to 8 show embodiments of the teeth of the present invention. Figure 5 is a longitudinal sectional side view showing the entire bottom part separated, Figure 6 is a bottom view of Figure 5, and Figure 7 is a bottom view of the bottom part. FIG. 8 is a vertical sectional side view showing only the bolt portion divided, and FIG. 8 is a bottom view of FIG. 7. ■...Tooth tip 2...U-shaped mounting part 3
・・・-L part 4 ・・・Bottom part No. n Fig. 2 Fig. 5 Fig. 8 Fig. 7 Fig. 8

Claims (1)

[Claims] A tooth having a mounting part formed in a U-shape so as to sandwich the tip of a packet, characterized in that the bottom side of the U-shape of the mounting part is divided, and the divided bottom side is made of high hardness.