Fluidic cylinder

Patent metadata

Field	Value
Publication number	US-10570934-B2
Application number	US-201515516323-A
Country	US
Kind code	B2
Filing date	Sep 10, 2015
Priority date	Oct 2, 2014
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

The present invention relates to a fluidic cylinder. This fluidic cylinder is configured in such a manner that a piston unit is received in an axially displaceable manner within a cylinder tube formed in a rectangular cross-sectional shape. The piston unit has: a base body having the front end of a piston rod staked thereto; a wear ring having the base body received therein and having a magnet incorporated therein; and piston packing adjacent to the wear ring. The piston unit is integrally held at one end of the piston rod. The wear ring and the piston packing are formed in a rectangular cross-sectional shape corresponding to the rectangular cross-sectional shape of the cylinder tube and are provided rotatable relative to the piston rod.

First claim

The invention claimed is:

1. A fluid pressure cylinder comprising:
a cylindrical cylinder tube including an internal cylinder chamber;
a pair of cover members attached to both ends of the cylinder tube;
a piston provided in a displaceable manner along the cylinder chamber; and
a piston rod coupled to the piston,
wherein each of the piston and the cylinder tube is formed to have a rectangular shape in cross section;
the piston includes a wear ring configured to slide on an inner wall surface of the cylinder tube in an axial direction of the cylinder tube;
a magnet hole in the wear ring, the magnet hole extending to an end surface of the wear ring in the axial direction of the cylinder tube; and
a magnet provided in the magnet hole of the wear ring, wherein with respect to the rectangular circumference of the wear ring, the magnet is provided only in one corner of the rectangular circumference.

2. The fluid pressure cylinder according to claim 1 , wherein a piston packing having a rectangular shape in cross section in a form of a sheet is provided for the piston, and the piston packing is provided adjacent to the wear ring.

3. The fluid pressure cylinder according to claim 2 , wherein a lubricant retention unit that is able to retain lubricant is provided at an outer marginal portion of the piston packing, and the lubricant retention unit is in a form of a groove depressed from a peripheral surface of the piston packing in a thickness direction of the piston packing.

4. The fluid pressure cylinder according to claim 3 ,
wherein the lubricant retention unit has an annular shape formed along the outer marginal portion.

5. The fluid pressure cylinder according to claim 3 , wherein the thickness of the piston packing is decreased gradually from the center of the piston packing toward the outer marginal portion of the piston packing and the groove is depressed from the surface of the piston packing where the thickness of the piston packing is decreased.

6. The fluid pressure cylinder according to claim 2 , wherein a packing hole is formed at a center of the piston packing, and the piston is configured to be attached to the packing hole; and
the packing hole has a rectangular shape corresponding to an outer shape of the piston packing.

7. The fluid pressure cylinder according to claim 1 , wherein a sensor attachment rail configured to attach a detection sensor for detecting magnetism of the magnet is provided at a position adjacent to a corner of the cylinder tube facing the magnet.

8. The fluid pressure cylinder according to claim 1 , wherein the piston is rotatably coupled to the piston rod.

9. The fluid pressure cylinder according to claim 1 , wherein the piston includes a coupling body coupled to an end of the piston rod;
the coupling body is partially placed inside the wear ring; and
a seal member is provided between the coupling body and the wear ring.

10. The fluid pressure cylinder according to claim 1 , wherein at least one of the cover members is provided detachably from the cylinder tube.

11. The fluid pressure cylinder according to claim 10 , wherein the cylinder tube and the cover member are fixed through a tightening member.

12. The fluid pressure cylinder according to claim 10 , wherein the cover member is fixed to the cylinder tube by a stopper member configured to contact an end surface of the cover member and to limit movement in an axial direction.

Assignees

• Smc Corp

Inventors

• Kudo Masayuki
• Suzuki Yasunaga
• Nemoto Shinichiro
• Yamada Jun
• Miyasato Eiko
• Mizutani Yuu
• Tamura Ken
• Kawakami Masahiko

Classifications

• F15B15/1419 Primary

  of non-circular cross-section · CPC title

• F15B15/2861

  using magnetic means · CPC title

• F15B15/226

  having elastic elements, e.g. springs, rubber pads · CPC title

• F15B15/1452

  Piston sealings · CPC title

• F15B15/28

  Means for indicating the position, e.g. end of stroke · CPC title