Pre-tensioning-pre-twisting full-bridge 2D electro-hydraulic proportional directional valve

Patent metadata

Field	Value
Publication number	US-9970464-B1
Application number	US-201314781454-A
Country	US
Kind code	B1
Filing date	Oct 31, 2013
Priority date	Apr 27, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A pre-tensioning-pre-twisting full-bridge 2D electro-hydraulic proportional directional valve can include a 2D valve, linear electro-mechanical converters at two ends of the 2D valve, and a compression-torsion coupling between the linear electro-mechanical converters. The 2D valve can include a valve core and a valve body, wherein the valve core is rotatably and axially slidably disposed inside an inner hole that is set along the axis line of the valve body. Each end shoulder of the valve core is provided with a pair of high pressure holes and low pressure holes, which are respectively communicated with a P opening and a T opening through an inner hole of the valve core.

First claim

The invention claimed is:

1. A pre-tensioning-pre-twisting full-bridge electro-hydraulic proportional directional valve, comprising a valve consisting of a valve core and a valve body, wherein the valve core is rotatably and axially slidably disposed inside an inner hole that is set along an axis line of the valve body, each of a left end and a right end of the valve core is provided with an end shoulder; the inner hole of the valve body between the end shoulders is successively provided with a first opening, a second opening, a third opening, a fourth opening, and a fifth opening; the third opening is a liquid inlet, a pressure of which is a system pressure; the valve core between the end shoulders is provided with two middle shoulders that are respectively positioned at the second opening and the fourth opening; and each of the shoulders is slidably in a seal fit with the inner hole of the valve body; wherein:
two ends of the valve are respectively connected with linear electro-mechanical converters by means of a compression-torsion coupling and cylindrical compression springs;
a left sensing cavity at the left end and a right sensing cavity at the right end are formed respectively among the end shoulders of the valve core, a plurality of end covers, and the valve body;
each of the end shoulders of the valve core is provided with a pair of high pressure holes and low pressure holes, namely, a first high pressure hole (b), a first low pressure hole (d), a second high pressure hole (c), and a second low pressure hole (e); wherein the first high pressure hole (b) and the second high pressure hole (c) are respectively communicated with the third opening through an inner hole of the valve core; and the first low pressure hole (d) and the second low pressure hole (e) are respectively communicated with the first and fifth openings through a trench at an inner side of the end shoulders of the valve core;
a wall of the inner hole of each of the two ends of the valve body is provided with a pair of axisymmetric sensing channels (f 1 and f 2 , and g 1 and g 2 ), respectively communicated with the left sensing cavity and the right sensing cavity;
both of the pairs of high pressure holes and low pressure holes are arranged at two sides of one of the sensing channels, are intersected with the respective sensing channel to form two channel openings, and are in series connection with the sensing channel to form hydraulic resistance half bridges; the pressure of the left and right sensing cavities is respectively controlled by the hydraulic resistance half bridges at two ends;
the compression-torsion coupling consists of a sliding wedge, two rolling bearings fixed respectively on two ends of a hinge pin running through an end of the valve core, a linear bearing mounted on the sliding wedge, and a pin bolt for restricting the sliding wedge to rotate; the cylindrical spring is mounted between the valve body and the sliding wedge, and a pre-compression amount of the cylindrical spring is slightly greater than the stroke of the valve core; the sliding wedge is slidably sleeved, by means of the linear bearing, on the pin bolt of an axial line parallel to the valve core;
the sliding wedge is provided with a first inclined plane and a second inclined plane respectively positioned at two sides of the axis line of the valve body; the first inclined plane and the second inclined plane are phase-inversion symmetric according to the axis line; the two rolling bearings respectively roll on the first inclined plane and the second inclined plane, so that the valve core twists while axially moving; the inclined planes of the sliding wedge at two ends mutually interwork so that a twist angle of the valve core has a definite corresponding relation with a position of the valve core along the axis line; and
the valve includes two movements comprising a linear movement and a rotation movement based on the valve core being disposed rotatably and axially slidably inside the inner hole of the valve body.

2. The proportional directional valve according to claim 1 , wherein, the inclined planes of the sliding wedges located at the same side of the axis line press, respectively from an entry surface and a retreat surface along a direction of rotation of the valve core, the bearings located at the same side of the axis line.

3. The proportional directional valve according to claim 2 , wherein the number of the first high pressure hole (b) and the second high pressure hole (c) on the end shoulder of the valve core is two, which are mutually and axisymmetrically distributed; the number of the first low pressure hole (d) and the second low pressure hole (e) on the end shoulder of the valve core is two, which are mutually and axisymmetrically distributed; and the first high pressure hole (b) and the second high pressure hole (c) are through holes, and are respectively communicated with the third opening through the inner hole of the valve core.

4. The proportional directional valve according to claim 3 , wherein the high pressure holes and the low pressure holes adopt a rectangular window.

5. The proportional directional valve according to claim 1 , wherein the number of the first high pressure hole (b) and the second high pressure hole (c) on the end shoulder of the valve core is two, which are mutually and axisymmetrically distributed; the number of the first low pressure hole (d) and the second low pressure hole (e) on the end shoulder of the valve core is two, which are mutually and axisymmetrically distributed; and the first high pressure hole (b) and the second high pressure hole (c) are through holes, and are respectively communicated with the third opening through the inner hole of the valve core.

6. The proportional directional valve according to claim 5 , wherein the high pressure holes and the low pressure holes adopt a rectangular window.

Assignees

• Univ Zhejiang Technology

Inventors

• Ruan Jian
• Li Wei
• Meng Bin
• Zuo Qiang
• Chen Ying

Classifications

• Y10T137/8671

  With annular passage [e.g., spool] · CPC title

• F15B13/0433 Primary

  the pilot valves being pressure control valves (F15B13/0435, F15B13/0436, F15B13/0438 take precedence) · CPC title

• F16K31/52483

  comprising a multiple-way sliding valve · CPC title

• F16K11/0716

  with fluid passages through the valve member (F16K11/0704, F16K11/0708, F16K11/0712 take precedence) · CPC title

• Y10T137/86694

  Piston valve · CPC title