Guide Bushing
Guide bushing is a key component in the hydraulic cylinder of the excavator, which plays a guiding role in the reciprocating movement of the piston rod to ensure the coaxiality between the piston rod and the cylinder barrel, so as to ensure the normal work of the excavator.
The following is a detailed introduction to the guide bushing:
1. the basic function and role
Guiding role:
the main function of the guide bushing is to guide the piston rod in the cylinder barrel to do linear reciprocating motion, to maintain the coaxiality between the piston rod and the cylinder barrel, reduce friction and wear.
Supporting role:
the guide bushing also provides support for the piston rod to keep it stable in the movement process.
Seal auxiliary:
in some designs, the guide bushing also auxiliary seals to improve the sealing performance of the hydraulic cylinder.
2. the material and manufacture
Commonly used materials:
guide sleeve materials are usually selected wear-resistant, corrosion-resistant, high-strength materials, such as HT1532 to HT2140 grey cast iron, wear-resistant cast iron, No. 45 steel, aluminium alloy, nylon, PTFE and so on.
The selection of different materials depends on the specific application scenario and working conditions.
Manufacturing process:
The manufacturing process of the guide bush may include casting, forging, machining and many other aspects.
For example, PTFE guide bush is pressed into blank parts from PTFE resin, sintered and cooled, and then finished by mechanical cutting methods according to the geometric dimensions and tolerance ranges required by customer drawings.
3. type and structure
Ordinary guide sleeve:
installed between the seal and the oil chamber of the hydraulic cylinder, it is easy to use the pressure oil in the oil chamber to lubricate the guide sleeve.
Easy to dismantle the guide sleeve:
this guide set in the hydraulic cylinder on the outside, with screws fastened to the cylinder head, easy to dismantle, suitable for poor working conditions, the need for frequent replacement of the guide sleeve seals and does not allow the dismantling of the hydraulic cylinder occasions.
Spherical guiding sleeve:
the spherical surface is in contact with the cylinder head, the position can be adjusted automatically, so that the axis of the guiding sleeve is always the same as the direction of movement, the movement is smooth and fast and the wear is uniform.
Hydrostatic guiding sleeve:
used in hydraulic cylinders with high speed of movement or high frequency of round trip and high vibration, there is a pressure oil film between the piston rod and the guiding sleeve, and there is no direct contact between the metals.
4. the technical requirements
Matching accuracy:
the guiding sleeve and the piston rod, cylinder cylinder cylinder with high precision requirements, in order to ensure the accuracy and reliability of the guide.
Wear resistance:
the guiding sleeve needs to have good wear resistance to cope with the friction and wear generated by the piston rod in the movement process.
Sealing:
in some designs, the guide sleeve also needs to have good sealing to prevent hydraulic oil leakage.
5. application and maintenance
Application:
Excavator guiding sleeve is widely used in various excavator hydraulic cylinders, which is one of the important parts for the normal operation of the excavator.
Maintenance:
Regularly check the wear and tear of the guide sleeve, and replace the badly worn guide sleeve in time to ensure the normal work and safety of the excavator.
Brands:XCMG/HitachiKoki/DAEWOO
Overview of Company
Certificates
Factory
Service：
1.Sample service: samples are provided according to customers’ instruction.
2. Customied services: guide bushing can be customized according to customers’demand.
3. One year warranty, some additional products will be supplied next time if they are in bad condition.
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