Single-way damping plunger cylinder and forklift comprising the same

Patent metadata

Field	Value
Publication number	US-2016238045-A1
Application number	US-201615136365-A
Country	US
Kind code	A1
Filing date	Apr 22, 2016
Priority date	Oct 24, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A single-way damping plunger cylinder includes a cylinder body ( 3 ), a piston rod ( 4 ), a piston ( 6 ) and a sleeve ( 2 ), the piston ( 6 ) dividing the cylinder body ( 3 ) into a first cylinder chamber ( 31 ) and a second cylinder chamber ( 32 ), a first end of the first oil passage ( 40 ) being communicated with the first cylinder chamber ( 31 ) via the second oil passage ( 41 ) and a second end of the first oil passage ( 40 ) being communicated with the second cylinder chamber ( 32 ), the valve ( 5 ) movably disposed in the second oil passage ( 41 ) to open or close a direct communication of the first and second oil passages ( 40,41 ); a damping oil passage ( 50 ) defined in the valve ( 5 ) to communicate the first oil passage ( 40 ) with the second oil passage ( 41 ). A forklift is also provided.

First claim

What is claimed is:

1 . A single-way damping plunger cylinder, comprising:
a cylinder body defining a top end and a bottom end; a piston rod defining a first end extending out of the cylinder body and a second end located within the cylinder body; a piston disposed in the cylinder body and fixed to the second end of the piston rod, the piston dividing the cylinder body into a first cylinder chamber and a second cylinder chamber, the piston rod located at least partially in the first cylinder chamber; a first oil passage and a second oil passage defined in the piston rod, a first end of the first oil passage being communicated with the first cylinder chamber via the second oil passage and a second end of the first oil passage being communicated with the second cylinder chamber; a valve movably disposed in the second oil passage, so as to open or close a direct communication of the first and second coil passages; a damping oil passage defined in the valve and configured to communicate the first oil passage with the second oil passage when the valve closes the direct communication of the first and second oil passages, an inner diameter of the damping oil passage being less than that of the first oil passage; and a sleeve disposed on an inner surface of the cylinder body and adjacent to the top end of the cylinder body, and the sleeve being configured to drive the valve to close the direct communication of the first and second oil passages.

2 . The single-way damping plunger cylinder of claim 1 , wherein an inner diameter of the sleeve is gradually decreased along a direction from the bottom end of the cylinder body to the top end of the cylinder body.

3 . The single-way damping plunger cylinder of claim 1 , further comprising a supporting member disposed in the second oil passage and configured to support the valve.

4 . The single-way damping plunger cylinder of claim 3 , wherein the valve comprises:
a right portion configured to contact the sleeve, a left portion contacting the supporting member, and a blocking portion disposed between the right and left portions and configured to close the direct communication of the first and second oil passages.

5 . The single-way damping plunger cylinder of claim 4 , wherein the right portion, the left portion and the blocking portion are integrally formed.

6 . The single-way damping plunger cylinder of claim 4 , wherein the right portion has a hemisphere shape, and the left portion has a taper shape.

7 . The single-way damping plunger cylinder of claim 4 , wherein the supporting member defines a center hole therein, the left portion of the valve is configured to hermetically contact the center hole.

8 . The single-way damping plunger cylinder of claim 7 , wherein an inner diameter of the center hole is smaller than a maximum outer diameter of the left portion.

9 . The single-way damping plunger cylinder of claim 7 , wherein the supporting member comprises a stop ring disposed within the center hole, an elastic member is disposed between the stop ring and the left portion, the stop ring defines an oil hole therein.

10 . The single-way damping plunger cylinder of claim 7 , wherein an outer surface of the supporting member is connected to an inner surface of the second oil passage via a threaded connection, and an inner surface of the supporting member is connected to an outer surface of the stop ring via a threaded connection.

11 . The single-way damping plunger cylinder of claim 4 , wherein a first end of the damping oil passage extends to a side surface of the left portion, and a second end of the damping oil passage extends to a bottom surface of the blocking portion.

12 . The single-way damping plunger cylinder of claim 1 , further comprising a wear-resisting member disposed between the piston and the cylinder body.

13 . The single-way damping plunger cylinder of claim 1 , further comprising a cylinder cover fitted on the top end of the cylinder body to seal the cylinder body.

14 . The single-way damping plunger cylinder of claim 1 , further comprising an oil inlet disposed at the bottom end of the cylinder body.

15 . A forklift, comprising a single-way damping plunger cylinder of claim 1 .

Assignees

• Byd Co Ltd

Inventors

• He Xiyang
• Chen Kuiyu

Classifications

• F16F2230/007

  with, or used as an end stop or buffer; Limiting excessive axial separation · CPC title

• F16F9/49

  Stops limiting fluid passage, e.g. hydraulic stops {or elastomeric elements inside the cylinder which contribute to changes in fluid damping (fluid-actuated displacement devices with means for accelerating or decelerating the stroke F15B15/22)} · CPC title

• F15B15/225 Primary

  with valve stems operated by contact with the piston end face or with the cylinder wall · CPC title

• F15B15/149

  Fluid interconnections, e.g. fluid connectors, passages · CPC title

• B66F9/22

  Hydraulic devices or systems · CPC title