Forklift, hydraulic cylinder assembly and hydraulic device thereof

  • US 10,253,790 B2
  • Filed: 05/04/2016
  • Issued: 04/09/2019
  • Est. Priority Date: 11/29/2013
  • Status: Active Grant
First Claim
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1. A hydraulic cylinder assembly, comprising:

  • a cylinder defining a first oil inlet, a second oil inlet, a first oil outlet and a second oil outlet therein;

    a cylinder liner disposed within the cylinder and being moveable between a first position and a second position, and defining a first oil port and a second oil port therein;

    a piston disposed within the cylinder liner and being moveable between a third position and a fourth position; and

    a first piston rod connected to one of two end faces of the piston and defining a free end extending out of the cylinder,wherein a first oil chamber and a second oil chamber are defined by the cylinder, the cylinder liner and the piston and located at two sides of the piston respectively, the first oil chamber is communicated with the first oil port, and the second oil chamber is communicated with the second oil port,wherein when the cylinder liner is located at the first position, a communication between the first oil inlet and the first oil port is formed, a communication between the second oil inlet and the second oil port is interrupted, a communication between the first oil chamber and the first oil outlet is interrupted, and a communication between the second oil chamber and the second oil outlet is formed,wherein when the cylinder liner is located at the second position, the communication between the first oil inlet and the first oil port is interrupted, the communication between the second oil inlet and the second oil port is formed, the communication between the first oil chamber and the first oil outlet is formed, and the communication between the second oil chamber and the second oil outlet is interrupted; and

    wherein a first oil groove and a second oil groove are formed in the cylinder liner, the first oil groove is communicated with the first oil port and the first oil chamber respectively, and the second oil groove is communicated with the second oil port and the second oil chamber respectively.

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