Coupling shaft for gear pump

Patent metadata

Field	Value
Publication number	US-9546655-B2
Application number	US-201414456145-A
Country	US
Kind code	B2
Filing date	Aug 11, 2014
Priority date	Feb 25, 2011
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A shaft assembly includes a shaft with a first radial shoulder and a second radial shoulder. The first radial shoulder and the second radial shoulder each include at least one slot. An axial separation between the first radial shoulder and the second radial shoulder defines an axial distance SA along an axis of rotation. The at least one slot defines a lowermost radial dimension SR from the axis of rotation. A ratio of SR/SA is 0.25-0.77.

First claim

What is claimed is:

1. A coupling shaft assembly comprising:
a coupling shaft having opposed splined end sections, said coupling shaft defining a first radial shoulder and a second radial shoulder, said first radial shoulder and said second radial shoulder being located between said opposed splined end sections, said first radial shoulder and said second radial shoulder each include at least one slot, wherein an axial separation between said first radial shoulder and said second radial shoulder has an axial distance SA along an axis of rotation, said at least one slot defines a lowermost radial dimension SR from the axis of rotation, and a ratio of SR/SA is 0.25-0.77.

2. The coupling shaft assembly as recited in claim 1 , wherein said at least one slot of said first radial shoulder and said at least one slot of said second radial shoulder are axially aligned with each other.

3. The coupling shaft assembly as recited in claim 1 , wherein said first radial shoulder and said second radial shoulder have different outer diameter dimensions.

4. The coupling shaft assembly as recited in claim 1 , further comprising a driven gear mounted to said coupling shaft, said driven gear meshing with a drive gear mounted to an input shaft.

5. A coupling shaft assembly comprising
a coupling shaft with a first radial shoulder and a second radial shoulder, said first radial shoulder and said second radial shoulder each include at least one slot, wherein an axial separation between said first radial shoulder and said second radial shoulder has an axial distance SA along an axis of rotation, said at least one slot defines a lowermost radial dimension SR from the axis of rotation, and a ratio of SR/SA is 0.25-0.77, wherein said ratio of SR/SA of said at least one slot permits continual draining and replenishing of a lubricant with respect to a splined end section of said coupling shaft and control of lubricant pressure build-up.

6. The coupling shaft assembly as recited in claim 5 , wherein said first radial shoulder and said second radial shoulder are both located between a first splined end section and a second splined end section.

7. The coupling shaft assembly as recited in claim 5 , wherein said at least one slot of said first radial shoulder and said at least one slot of said second radial shoulder are axially aligned with each other.

8. The coupling shaft assembly as recited in claim 5 , wherein said first radial shoulder and said second radial shoulder have different outer diameter dimensions.

9. The coupling shaft assembly as recited in claim 5 , further comprising a driven gear mounted to said coupling shaft, said driven gear meshing with a drive gear mounted to an input shaft.

10. The coupling shaft assembly as recited in claim 5 , wherein said coupling shaft is solid at least between said first radial shoulder and said second radial shoulder.

11. The coupling shaft assembly as recited in claim 5 , wherein said first radial shoulder and said second radial shoulder maintain axial position of said coupling shaft such that splined end sections of said coupling shaft maintain full spline engagement with mating gears that mesh with said splined end sections.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Shah Satish Shantilal
• Walgren Timothy P

Classifications

• Y10T403/7035

  Specific angle or shape of rib, key, groove, or shoulder · CPC title

• Y10T403/7037

  Cross-Sectional Technologies · mapped topic

• F04C15/0057 Primary

  Driving elements, brakes, couplings, transmission specially adapted for machines or pumps (brakes, couplings, transmissions per se F16, B60) · CPC title

• Y10T29/49236

  Fluid pump or compressor making · CPC title

• F02M37/041

  Arrangements for driving gear-type pumps · CPC title