Fixed wobbler for hydraulic unit

Patent metadata

Field	Value
Publication number	US-10273990-B2
Application number	US-201514596439-A
Country	US
Kind code	B2
Filing date	Jan 14, 2015
Priority date	Jan 14, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A fixed wobbler of a hydraulic unit includes a body having a first end and an opposite second end, the first end defining a first surface, and the second end defining a second surface oriented at an angle relative to the first surface, the body having an outer diameter and an inner wall defining an inner diameter, wherein the outer diameter is approximately 2.1655+0.0000−0.0007 inches (5.5004+0.000−0.0018 cm), and wherein the inner diameter is approximately 1.043±0.003 inches (2.6492±0.0076 cm).

First claim

What is claimed is:

1. A fixed wobbler of a hydraulic unit, the fixed wobbler comprising:
a body having a first end and an opposite second end, the first end defining a first surface, and the second end defining a second surface oriented at an angle relative to the first surface, the body having an outer diameter extending from the first surface to the second surface and an inner wall defining an inner diameter, the body includes a locking feature formed in the outer diameter and extends towards the inner wall, the outer diameter is 2.1655+0.0000−0.0007 inches (5.5004+0.000−0.0018 cm), and the inner diameter is 1.043±0.003 inches (2.6492±0.0076 cm), the body first end includes a first corner break disposed adjacent to a second corner break, the first corner break oriented relative to the first surface at a second angle, the second angle is 40°+0.00°−0.25°.

2. The fixed wobbler of claim 1 , wherein the body further comprises a cutout formed in the first surface about at least a portion of the inner wall.

3. The fixed wobbler of claim 2 , wherein the cutout defines an inner shoulder having a radius of 0.156±0.015 inches (0.3962±0.1381 cm).

4. The fixed wobbler of claim 1 , wherein the angle is between 12.75° and 16.75°.

5. The fixed wobbler of claim 1 , wherein the angle is 14.75°.

6. The fixed wobbler of claim 1 , wherein the locking feature is defined by an inner rear wall that extends between a pair of side walls that extend between the outer diameter and the inner rear wall.

7. The fixed wobbler of claim 6 , wherein the locking feature has a length of 0.503±0.010 inches (1.2777±0.0254 cm).

8. The fixed wobbler of claim 6 , wherein a distance between the side walls is 0.250+0.005−0.000 inches (0.635+0.0127−0.000 cm).

9. The fixed wobbler of claim 6 , wherein a distance from the inner rear wall to a centerpoint of the outer diameter is 0.982+0.000−0.010 inches (2.4943+0.000−0.0254).

10. The fixed wobbler of claim 1 , wherein the second surface comprises a friction-reducing coating.

11. The fixed wobbler of claim 10 , wherein a thickness of the friction-reducing coating is between 3 microns and 5 microns.

12. The fixed wobbler of claim 11 , wherein the friction-reducing coating is an Amorphous Diamond-like Carbon Coating.

13. The fixed wobbler of claim 1 , wherein the inner wall includes a corner break that is less than or equal to 0.005 inches (0.0127 cm).

14. The fixed wobbler of claim 1 , wherein a portion of the first surface opposite the locking feature becomes progressively closer to the second surface in a direction that extends from the inner diameter towards the outer diameter.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Campbell Kris H
• Lemmers Jr Glenn C
• Smith Doren C
• Dell Jonathan C
• Yung Jong-Yeong
• Martin Ted A

Classifications

• F04B1/2078 Primary

  Swash plates · CPC title

• F15B15/1404 Primary

  in clusters, e.g. multiple cylinders in one block · CPC title