Track tensioning device, track walking mechanism and hydraulic excavator

Abstract

The invention discloses a track tensioning device, which is provided with a buffer cylinder and a tensioning cylinder along the front-rear direction, wherein the tensioning cylinder is used for tensioning a track, the buffer cylinder is used for buffering the impact of the track and comprises a first cylinder, the tensioning cylinder comprises a second cylinder, and the first cylinder and the second cylinder are connected with each other through cylinder bottoms. The invention also discloses a track walking mechanism with the track tensioning device and a hydraulic excavator with the track walking mechanism. Because the first cylinder of the buffer cylinder is connected with the second cylinder of the tensioning cylinder through the cylinder bottoms in the track tensioning device, when being manufactured, the first cylinder and the second cylinder can be separately manufactured and then connected together; and especially, when the cylinder diameter of one cylinder is needed to be enlarged, the manufacture of the other cylinder is not influenced. Therefore, the track tensioning device provided by the invention is especially convenient for manufacturing and strong in practicability when being applied to ultra-large engineering machinery.

Description

technical field [0001] The invention relates to the field of crawler belt tensioning, in particular to a crawler belt tensioning device, a crawler running mechanism using the crawler belt tensioning device and a hydraulic excavator using the crawler belt running mechanism. Background technique [0002] In crawler-type construction machinery, such as crawler hydraulic excavators, a crawler tensioning device is usually used to tension the crawler. This kind of crawler tensioning device also has the function of tightening the crawler when it encounters a large impact. buffering effect. For example, in the patent whose authorized notification number is CN 101767612B, a large mine hydraulic excavator crawler tensioning device is disclosed, which consists of two parts, a tensioning cylinder and a buffering device, wherein the buffering device is a buffering cylinder, It is set in the same cylinder as the tensioning cylinder, and the buffer cylinder is set on the side of the guide...

AI Technical Summary

Problems solved by technology

[0004] However, since the tension force of the crawler belt is directly proportional to the traction force of the machine, the traction force in super-large construction machinery, such as a super-large hydraulic excavator, is very large, so the bore diameter of the buffer oil cylinder required for buffering will be large

However, in the prior art, the buffer oil cylinder and the tension oil cylinder are arranged in the same cylinder body, that is, the cylinder bodies of the buffer oil cylinder and the tension oil cylinder are integrally formed, which will bring great difficulties to processing and manufacturing, and the manufacturing The weight of the cylinder block and the structure are huge

It is not suitable for the use of extra-large construction machinery such as extra-large crawler hydraulic excavators;

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