JPH0421880Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shroud fixing structure that is fitted into the front edge of the bucket main body between the digging claws to prevent wear of the front edge. In particular, the present invention relates to a shroud fixing structure suitable for large-capacity excavation buckets such as bottom-dump buckets.

[Conventional technology]

In a large-capacity excavation bucket equipped with a large hydraulic excavator, such as a large-capacity bottom dump type bucket, a shroud is fitted to the front edge of the bucket main body (front bucket) between the digging claws. A structure is adopted to prevent wear of the front edge. Next, its structure will be explained with reference to FIGS. 4 to 9. Figure 4 shows a bottom dump type bucket cart, and the bucket main body is formed by a rear bucket cart 1 and a front bucket cart 2.
can rotate relative to the rear bucket 1 about a pin 3 as a fulcrum. An opening/closing cylinder 4 for rotating the front bucket 2 is installed inside the rear bucket 1, and the tip of a piston rod 4a of the opening/closing cylinder 4 is connected to the pin 3 via an arm 5.
is connected to. The front bucket bag 2 is opened and closed by the shortening and expanding operations of the opening/closing cylinder 4. Also, the front bucket 2
A plurality of digging claws 6 and a shroud (not shown) for preventing wear of the front edge are attached to the front edge 2a of the excavator.

In Figures 5 and 6, front bucket 2
A plurality of noses 2b are provided protrudingly at predetermined intervals on the front edge 2a of the nose 2b, each nose 2b is fitted with a cap portion 6a of the pawl 6, and a long hole is formed between the cap portion 6a and the nose 2b. Each pawl 6 is fixed to the front edge 2a of the front bucket 2 by press-fitting two taper pins 8a and 8b into the pin hole.
In FIG. 5, FIG. 7, FIG. 8, and FIG. 9, the shroud 7 is fitted into the front bucket leading edge 2a between the noses 2b, and the shroud 7 is fitted on both sides of the leading edge of the shroud 7. The rising surface 7a provided
They are prevented from coming off by facing the cap end surfaces 6b of the adjacent claws 6, respectively.

[Problem that the invention attempts to solve]

In the above-mentioned excavation bucket, the front bucket 2 including the nose 2b, each pawl 6, and the shroud 7 are generally made of casting, that is, the nose part,
Since the dimensional tolerances of the cap part of the claw 6 and the shroud 7 are slightly larger, the accumulation of the dimensional tolerances of these parts will result in the rising surface 7a of the shroud 7 and the end face 6b of the cap part of the claw 6 when the bucket is assembled.
A gap δ is formed between the two. If the excavation bucket in which such a gap δ is formed is used as is, each shroud 7 will move within the range of the gap δ in accordance with the upward and downward movement of the bucket, and the end surface 6b of the cap portion of the claw 6 and Front edge 2a of front bucket 2
There is a problem in that it collides with the metal and generates a fairly loud metallic sound (noise).

As a countermeasure to this problem, it is possible to fix the shroud 7 to the front edge 2a of the front bucket 2 by welding, but in this case, the shroud 7 cannot be replaced, so when the shroud 7 becomes worn, Repairs will be made using overlay. However, since this repair takes a considerable amount of time, it is difficult to apply it to large hydraulic excavators where availability is important.

An object of the present invention is to provide a structure for fixing a shroud in an excavation bucket, which allows the shroud to be replaced without being welded to the bucket main body so that the shroud does not move, and which can prevent the occurrence of loud metallic sounds due to collisions. It is in.

[Means for solving problems]

The above purpose is to form a recess on either the end face of the cap portion of the excavating claw or the rising surface of the shroud, fit an elastic body with a large elastic force into the recess, and deform the elastic body to form the cap of the claw. This is achieved by bringing the end face of the shroud into contact with the rising face of the shroud.

[Effect]

The elastic force of the elastic body pushes the shroud in the direction of tighter fitting, thereby restricting movement of the shroud.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a partially sectional side view of a shroud fixing structure according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a view taken along the - arrow in FIG. 1. In the figures, the same reference numerals as in FIGS. 5 to 9 indicate the same or equivalent parts. This shroud fixing structure includes forming a recess 9 in the rising surface 7a of the shroud 7, fitting a hard rubber 10 with large elasticity into the recess 9, and fixing the hard rubber 10 in a deformed state to the cap of the claw 6. It has a structure in which it is brought into contact with the end surface 6b.

Next, the operation of this embodiment will be explained.

As the excavation bucket moves up and down, the shroud 7 tries to move within the gap δ formed between the cap end surface 6b of the claw 6 and the rising surface 7a of the shroud 7. The elastic force of the hard rubber 10 presses the cap in the direction of tighter fitting and restricts the movement of the claw 6, thereby eliminating the collision of the claw 6 with the cap end face 6b and the front edge 2a of the front bucket 2, thereby reducing noise ( Metallic sound)
will never occur. Furthermore, since the shroud 7 is simply fitted into the front edge 2a of the front bucket 2, it can be replaced easily.

In this embodiment, an example is shown in which hard rubber 10 is used as the elastic body, but a leaf spring may also be used. Further, a recess 9 into which the elastic body is fitted may be formed in the end face 6b of the cap portion of the claw 6.

[Effect of idea]

As explained above, according to the present invention, the shroud is not welded to the bucket main body so that it does not move, so the shroud can be replaced and the occurrence of loud metallic sounds (noise) due to collisions can be prevented.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a partially sectional side view of a shroud fixing structure according to the present invention, FIG. 2 is a plan view thereof, and FIG. Figure 1 is a view in the - direction of the arrow, Figure 4 is a side view of the bottom dump type bucket to which the present invention is applied, and Figure 5 is a plan view of the mounting portion of the digging claw and shroud viewed from the - direction in Figure 4. Figure 6 is a cross-sectional view of Figure 5, Figure 7 is a side view of the shroud mounting section, Figure 8 is a plan view thereof, and Figure 9 is a cross-sectional view of Figure 7.
It is a - arrow direction view of a figure. 2a... Front edge of front bucket, 6... Excavation pawl, 6a... Cap part of the pawl, 6b... Cap end face, 7... Shroud, 7a... Rising surface of shroud, 9... Recessed part , 10...Hard rubber.

Claims (1)

[Scope of utility model registration request] A plurality of noses are protruded at predetermined intervals from the front edge of the bucket main body, a cap part of the digging claw is fitted to each nose, and a pin is press-fitted into the pin hole drilled between the cap and the nose. While the pawl is fixed to the bucket main body, a shroud for preventing abrasion of the front edge is fitted to the front edge of the bucket main body between the noses, and the caps of the adjacent pawls are attached to the front surfaces of both ends of the shroud. In the excavation bucket in which the shroud is prevented from coming off by facing the respective end surfaces of the cap, an elastic body is provided between the end surfaces of the cap portions of the mutually opposing claws and the front surfaces of both end portions of the shroud to be crimped to both surfaces. A fixing structure of a shroud in an excavation bucket, characterized in that it is interposed.