JPH07329836A - Truck shoe lightening structure and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain the truck shoe lightening structure, which can reduce the weight of a truck shoe and which can prevent the generation of noise, and the manufacture thereof. CONSTITUTION:A hollow 2 formed inside of a truck shoe 1 is filled with the foaming agent 3 without a clearance, and the top surface thereof is coated with the coating agent 4 so as to protect the foaming agent 3. The foaming agent 3 is made of foaming urethane, foaming styrol of the like, and the coating agent 4 is made of synthetic rubber such as silicon rubber. Noise of the truck shoe 1 is reduced, and while the increase of the weight of the truck shoe 1 can be prevented by coating the foaming agent 3, which is filled in the hollow 2 formed inside of the truck shoe 1, for protection with the coating agent 4 without providing a steel plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight structure of a track shoe which reduces the weight and prevents the generation of noise, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Noise generated from undercarriage devices such as construction machines is largely caused by the vibration of track shoes due to the engagement of sprockets and pin bushes. As a measure for preventing these noises, by filling a filling material into the hollow inside of the track shoe and curing it, vibration of the track shoe can be suppressed and damping can be accelerated to effectively prevent the noise of the track shoe. Therefore, in the case of a track shoe having a substantially triangular cross section such as a track shoe for wetlands, conventionally, as shown in FIG. 4, an inner cavity 12 of the track shoe 11 is filled with a filler 13 and a steel plate 14 is provided at an opening portion. It is known that the lid is welded to the structure (Actual Kaihei 5-65).
779). However, welding a steel plate for each track shoe significantly increases the weight. Also, if the iron plate is made thin (1.5 mm or less), there will be holes during welding and it will not be possible to attach it to the track shoe. Therefore, there is a drawback in that the introduction of the machine is restricted due to the weight restriction when the machine is carried in by a crane, especially for loading and unloading the ship.

[0003]

The present invention was devised in view of the above circumstances, and its main problem is to reduce the weight and prevent the generation of noise by reducing the weight of the track shoe. There is in providing the manufacturing method.

[0004]

In order to solve the above problems, according to the invention of claim 1, the inner hollow opening inside the track shoe is filled with a foaming agent, and the upper surface of the foaming agent is strengthened. And a coating agent having water resistance and heat resistance, and the coating agent is integrally adhered to a track shoe. Further, in the invention of claim 3, a technical means is adopted in which the foaming agent is a foam of synthetic resin having adhesiveness to the material of the track shoe such as urethane foam and styrene foam. Further, in the invention of claim 4, a technical means is adopted in which the coating agent is made of synthetic rubber such as silicone rubber and has adhesiveness to the material of the track shoe together with the foaming agent. According to the invention of claim 5, a foaming agent is filled in the inner hollow opening inside the track shoe, and the upper surface of the foaming agent after foaming and hardening is coated with a coating agent having water resistance and weather resistance. The technical means of the method of integrally fixing the foaming agent to the track shoe by the property is taken.

[0005]

[Operation] According to the present invention, the inside hollow of the track shoe is filled with the foaming agent, the upper surface of the foaming agent is covered with the coating agent, and the foaming agent is integrally attached to the track shoe. Thus, when a shock is applied to the track shoe from the outside, the vibration of the track shoe is damped by the foaming agent filled in the hollow interior, and the damping time is shortened to prevent annoying noise. Moreover, the increase in the weight of the track shoe can be suppressed as much as possible. Since the foaming agent is covered with the coating agent, damage and deterioration of the foaming agent can be protected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a lightweight structure for a track shoe according to the present invention will be described below with reference to the drawings. First
The noise reduction track shoe 1 shown in FIGS. 3 and 4 shows an embodiment in the case where the noise reduction track shoe 1 is a track shoe for a wetland, which is equipped in the track chain structure C and has a substantially triangular cross section.

The shape of the ground contact surface of the noise reduction track shoe 1 is not particularly limited, but in the present embodiment, the front inclined surface and the rear surface, which originate from the front end and the rear end of the track shoe 1 and gather toward the common top, respectively. With a sloped surface of the track shoe 1, the top of which forms an arc extending between the longitudinal ends of the track shoe 1 in front of and behind the track shoe 1, and the outer end portion of the arcuate top of the track shoe 1. It is arranged in the front and has a known configuration in which the central part of the arcuate top is arranged in the rear of the track shoe 1.

The inside hollow 2 of the track shoe 1 is filled with a foaming agent 3 without any gap, and the upper surface thereof is coated with a coating agent 4 to protect the foaming agent 3. In the present embodiment, the foaming agent 3 is a synthetic resin foam having adhesiveness to the material of the track shoe, such as urethane foam and styrene foam. The foaming agent 3 is foam-molded and filled in the inner hollow 2 of the track shoe 1. Then, the upper surface of the foaming agent 3 is adjusted to be substantially flush with the upper end of the track shoe 1. Instead of the above configuration, a foaming agent 3 that matches the shape of the inner hollow 2 of the track shoe 1 may be formed in advance, and the foaming agent 3 may be fitted into the inner hollow and bonded.

By using the foaming agent 3 as described above, it is possible to prevent dust and the like from entering the inner hollow 2 of the track shoe 1. Further, since it is a foam and has a large number of pores, the weight becomes light. And
Noise can be reduced by filling the inner hollow of the track shoe 1 with no space.

Next, in this embodiment, the coating agent 4 is made of synthetic rubber such as silicone rubber. The coating agent 4 is a semi-curing material having strength, water resistance and heat resistance, and a material having adhesiveness between the foaming agent 3 and the track shoe is used. Then, the upper surface of the track shoe 1 and the upper surface of the foaming agent 3 filled in the same are evenly applied, semi-cured and fixed.

By using the coating agent 4, the pores opened on the surface of the foaming agent 3 can be covered so as not to contain water, and the invasion of other dust, dust, liquid, etc. can be sealed. it can. Further, since the foaming agent 3 is made of synthetic resin and is weak against heat, it is easily plastically deformed, but the coating agent can suppress the heat conduction and protect it. Since the foaming agent 3 is easily damaged or deteriorated, it can be protected, and the foaming agent 3 can be prevented from being broken even when cleaning the underbody device with strong air.

As described above, since the foaming agent 3 is filled in the inner hollow 2 of the track shoe 1 and the upper surface of the foaming agent 3 is covered with the coating agent 4, the foaming agent 3 is integrally formed on the track shoe. Can be installed. And
When an impact is applied to the track shoe 1 from the outside,
The vibration of the track shoe 1 is damped by the foaming agent 3 with which the hollow inside is filled, and the damping time is also shortened to prevent annoying noise. Further, since only the foaming agent and the coating agent are added to the track shoe 1, it is possible to suppress an increase in the weight of the track shoe 1. Furthermore, since the coating agent 4 is semi-cured and fixed, there is no risk of cracks.

[0013]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, a noise-reducing track shoe can be manufactured by an extremely simple work process in which the inner hollow portion of the track shoe is filled with a foaming agent, covered with a coating agent and cured. it can. Therefore, it is not necessary to previously mold a track shoe having a special shape as the noise reducing track shoe, and even an existing track shoe can be easily processed. Also, by covering the foaming agent filled inside the track shoe with a sealing agent without providing a steel plate to protect it, it is possible to reduce the noise of the track shoe and prevent the track shoe from increasing in weight. Therefore, when the machine is carried in by a crane, there is no fear that the introduction will be restricted due to the weight restriction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a track shoe of the present invention.

FIG. 2 is a perspective view of the same track shoe.

FIG. 3 is a perspective view of a main part with a track shoe attached.

FIG. 4 is a cross-sectional view showing a conventional noise preventing structure for a track shoe. 1 Track shoe 2 Internal cavity 3 Foaming agent 4 Sealing agent

Claims (5)

[Claims] 1. A foaming agent is filled in an internal hollow opening inside a track shoe, and the upper surface of the foaming agent is coated with a coating agent having strength, water resistance and heat resistance. The lightweight structure of the track shoe, which is characterized by being integrally bonded to the track shoe. 2. The lightweight structure of a track shoe according to claim 1, wherein the track shoe has a substantially triangular cross section. 3. The lightweight structure of a track shoe according to claim 1, wherein the foaming agent is made of a synthetic resin foam having adhesiveness to the material of the track shoe such as urethane foam and styrene foam. . 4. The weight reduction of the track shoe according to claim 1, wherein the coating agent is made of synthetic rubber such as silicone rubber and has adhesiveness to the material of the track shoe together with the foaming agent. Construction. 5. A foaming agent is filled in the inner hollow opening inside the track shoe, and the upper surface of the foaming agent after foaming and curing is covered with a coating agent having water resistance and weather resistance, and the foaming agent has such adhesiveness. A method of manufacturing a track shoe, characterized in that it is integrally fixed together with the track shoe.