High vibration pneumatic piston assembly made from additive manufacturing

Patent metadata

Field	Value
Publication number	US-2016363221-A1
Application number	US-201514736799-A
Country	US
Kind code	A1
Filing date	Jun 11, 2015
Priority date	Jun 11, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

A piston assembly includes a piston with a first cap disposed on a first end of the piston and a second cap disposed on a second end of the piston. A piston cross-member is in between the first cap and the second cap. A cover is formed with the piston cross-member and extends between the first cap and second cap.

First claim

1 . A piston assembly comprising:
a piston including a first cap disposed on a first end of the piston and a second cap disposed on a second end of the piston; a piston cross-member in between the first cap and the second cap; and a cover formed with the piston cross-member, wherein the cover extends between the first cap and second cap.

2 . The piston assembly of claim 1 , wherein the piston assembly is attached to a crank mechanism including a shaft and a crank.

3 . The piston assembly of claim 2 further including a cutout in the cover.

4 . The piston assembly of claim 3 , wherein a first end of the crank is affixed to the shaft, and a second end of the crank is slidably and rotationally engaged with a slot in the piston cross-member.

5 . The piston assembly of claim 1 , wherein the piston cross-member includes at least one webbing.

6 . The piston assembly of claim 1 , wherein the cover includes a cylindrical shape.

7 . The piston assembly of claim 1 , wherein the piston includes a natural frequency of at least 2,000 hz.

8 . The piston assembly of claim 7 , wherein the piston includes a natural frequency of at least 2,300 hz.

9 . The piston assembly of claim 1 , wherein the cover and the piston form a single additively manufactured object.

10 . The piston assembly of claim 2 , wherein the crank mechanism includes a Scotch yoke crank mechanism.

11 . A piston assembly comprising:
a piston including a first cap disposed on a first end of the piston and a second cap disposed on a second end of the piston; a piston rod in between the first cap and the second cap; a cover permanently formed with the piston rod, the cover including a cutout and a first slot and a second slot, wherein the cover extends between the first cap and second cap; and a crank mechanism including a shaft and a crank, wherein a first end of the crank is affixed to the shaft, and a second end of the crank is slidably and rotationally engaged with a third slot in the piston rod.

12 . The piston assembly of claim 11 , wherein the cover includes a cylindrical shape.

13 . The piston assembly of claim 11 , wherein the piston includes a natural frequency of at least 2,000 hz.

14 . The piston assembly of claim 13 , wherein the piston includes a natural frequency of at least 2,300 hz.

15 . A method of additively manufacturing a piston assembly, the method comprising:
reading build instructions from a file stored in an electronic database; depositing material in accordance with the file; forming layers of solid material in accordance with the file; forming a piston with a cover including a cylindrical shape; and encasing a piston rod inside of the cover.

16 . The method of claim 15 further including attaching a Scotch yoke crank mechanism including a shaft and a crank to the piston rod.

17 . The method of claim 16 , wherein attaching a Scotch yoke crank mechanism includes slidably and rotationally engaging a first end of the crank with a slot in the piston rod and affixing a second end of the crank to the shaft.

18 . The method of claim 15 further including setting a natural frequency of the piston assembly to at least 2,000 hz.

19 . The method of claim 18 further including setting a natural frequency of the piston assembly to at least 2,300 hz.

20 . The method of claim 15 further including forming the piston assembly through direct metal laser sintering.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Kamp Josh
• Army Donald E

Classifications

• F16J1/14 Primary

  with connecting-rods, i.e. pivotal connections · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• F15B15/066 Primary

  the motor being of the scotch yoke type · CPC title

• F16K31/122

  the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence) · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title