Attachments Procedures for Operation / Assembly and Disassembly of Hydraulic Cylinder 1. Specifications and Structure Diagram (including the assembly diagram and parts table) This manual explains the KCH-6 model construction machine hydraulic cylinder, which has a structure typical of such cylinders. For details on the specifications and structure of the product being used, see the delivery diagram (including the assembly diagram and parts table) given separately.
2. Operation Explanation (1) Basic functions Hydraulic cylinders are a type of hydraulic actuator. A hydraulic cylinder converts the energy of pressure supplied from the hydraulic pump into a large force of linear motion. By operating the hydraulic pressure direction switchover valve, one can switch the direction of operation between extension and retraction. This linear motion with large force and the switchover of the operation direction are the basic functions. (2) Function of each location This manual explains the functions of each section of the cylinder using one of our products with a typical structure. There may be some slight differences with the product being used, but the functions are the same.
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1) Cylinder head assembly The cylinder head assembly has the function of bearing the piston rod (2) by the bushing (4) press fit into the interior diameter of the cylinder head (3). The seal system of the interior diameter of the cylinder head prevents oil from leaking to the outside and prevents foreign matter from getting into the cylinder. The cylinder head assembly also has the function of supplying and discharging high-pressure oil from inside the cylinder tube to the retraction side port.
1
Cylinder tube
7
U-ring
2
Piston rod
8
Backup ring
3
Cylinder head
9
Wiper ring
4
Bushing
10
O-ring
5
O-ring
11
Backup ring
6
Buffer ring
12
Installation bolt
• Bushing Press fit to the inside surface of the cylinder head (3) and contacts the piston rod (2). Together with the slide rings (18) and (19) on the outer circumference of the piston, the bushing divides the lateral load applied to the cylinder and moves linearly relative to the piston rod. Furthermore, it supports one end of the piston rod and has the function of minimizing eccentricity which has a negative impact on the sealing. • Buffer ring The buffer ring (6) has the function of buffering the pressure and heat applied on the U-ring (7) by the hydraulic oil to improve durability.
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