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Operation mechanism connector

A technology of working mechanism and connecting device, applied in the direction of connection, pivot connection, mechanical equipment, etc., can solve the problems of inability to remove the oil supply piping, inability to completely prevent the burning of the connection part, abnormal sound and abnormal wear, and high cost.

Inactive Publication Date: 2003-04-09
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the grease is supplied in this way, it is not possible to completely prevent burning, abnormal noise, and abnormal wear at the joint.
[0005] In addition, when fusion, abnormal sound, and abnormal wear occur at the joint, the working mechanism bearing bush and the working mechanism pin must be replaced together, and this replacement operation is troublesome and expensive.
[0006] In recent years, in order to facilitate the maintenance of the operating mechanism, sintered sliding materials of various metals with good melting resistance and good oil retention have been appropriately used for the bearing bush of the operating mechanism. The oil supply piping cannot be removed, and it is in a situation where it cannot be a good countermeasure in terms of cost
[0007] In addition, from the perspective of improving the working efficiency of construction machinery and working environment, it is very urgent to reduce the weight of the entire working mechanism and improve the sound absorption of the connection part, and the weight reduction of the connection part itself is also a problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] (Embodiment 1) Measurement of the stress applied to the pin shaft of the actual vehicle operating mechanism.

[0104] In this example, using PC300 of our company's construction machinery, it is known that when the top is nailed to the stroke end arm 90o, the cylinder axial force on the bottom of the bucket cylinder that is the most severe load is applied to these operations. The bending stress of the mechanism pin was measured using strain gauge gauges. exist Figure 4 The middle table shows the measurement results of the load weight calculated from the axial force and the bending stress generated in the outer diameter part (φ90mm) of the solid working mechanism pin, but the maximum load weight is 170.9 tons (ton), and the solid working mechanism pin The maximum stress on the outer diameter part is 23kg / mm 2 . In addition, when the thickness of the pin shaft of the cylindrical working mechanism is too thin, there will be many problems such as damage to the ring descr...

Embodiment 2

[0105] (Example 2) The circular ring of the pin shaft of the operating mechanism is damaged by fatigue failure

[0106] In the present embodiment, the outer diameter is 60mm, and the length is 140mm. The pin shaft TP of the working mechanism adjusted to wall thickness / outer diameter=0.175, 0.145, 0.1 by changing the inner diameter is contained in such as Figure 10 Fatigue tests were carried out on the jig shown, and the influence of the hardness of the inner diameter portion on the fracture strength of the inner diameter portion due to the ring damage tensile stress of the working mechanism pin shaft was studied. In addition, S45C carbon steel pipe material was used for the bearing bush of the working mechanism, and the outer diameter and inner diameter surface were induction hardened at the same time so that the hardening depth of HRC45 was about 3mm, and the level 1 (inner diameter hardening) that was annealed at 180°C for 3 hours was used. Layer hardness HRC57), level 2 wi...

Embodiment 3

[0112] (Example 3) Production of CuAl-based sintered plate and sliding test results

[0113] Al powder, Sn powder, TiH powder, Si powder, Mn powder, Ni powder, phosphorus iron powder and electrolytic copper powder (Fukuda Metal CE15) with particle size below 300 will be used, and the mixed powder shown in Table 1 will be used Figure 14 The mold for the tensile test piece of the JIS shown is molded at a forming pressure of 4 ton / cm 2 After forming, the test piece was sintered in a vacuum sintering furnace at 850, 900, and 960°C for 1 hour at a vacuum degree of 0.01 torr, and then rolled within the range where the test piece did not break, and the material (2S1R Material) hardness is measured, and then, for these materials, the constant speed friction and wear test method is used to measure the surface pressure and sliding speed, the quenching limit value (PV value) and the wear amount (ΔWmm ) to measure and evaluate the sliding properties. Table 1

[0114] exist Figure ...

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PUM

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Abstract

A coupling device for equipment implements is described, which coupling device does not impair the lubricity of bearing sections when the equipment is in service, does not cause seizure during rotation of bearings, does not need frequent feeding of grease to the bearing sections from outside, and provides good noise absorbability. The coupling device has such a structure that a metal based contact material (7) capable of storing a lubricating oil and / or lubricant is interposed between an implement bushing (1) made from steel and implement pin (4) of an implement for construction equipment.

Description

technical field [0001] The invention relates to a connecting device of an operating mechanism of construction and civil engineering machinery such as a hydraulic excavator and a bulldozer. Background technique [0002] Such as Figure 18 (a) As exemplified, the working mechanism of a construction machine such as a hydraulic excavator is mainly composed of a boom 51, an arm 52, and a bucket 53, and a connecting device for connecting these working mechanisms is often used to connect these mechanisms. The rotating part of the machine, the hydraulic cylinder part and the connection part of the vehicle body that operate these mechanisms. exist Figure 18 (b) shows the detailed structure (disassembled perspective view) of the bucket connecting portion, but on the working mechanism bearing bushes 54, 55 provided at the connecting portion, the inner diameter surface thereof is subjected to lubrication groove processing for grease. Through carburizing and quenching and high-frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/12E02F9/00F16C11/04F16C33/10
CPCY10T403/32861E02F9/006F16C33/103F16C33/102F16C11/045Y10T403/25F16C2350/26E02F9/12
Inventor 高山武盛大西哲雄
Owner KOMATSU LTD