Crankshaft with aligned drive and counterweight locating features

Patent metadata

Field	Value
Publication number	US-9909586-B2
Application number	US-201213428406-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Mar 23, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A scroll compressor includes a housing, and scroll compressor bodies disposed in the housing. The scroll bodies include a first and second scroll bodies. The first and second scroll bodies have respective bases and respective scroll ribs that project from the respective bases, wherein the scroll ribs mutually engage. The second scroll body is movable relative to the first scroll body for compressing fluid. A drive unit rotates a drive shaft to drive the second scroll body in an orbital path. The drive shaft has an eccentric drive configured to engage a corresponding drive hub on the second scroll body. The eccentric drive has a drive surface acting on the corresponding drive hub in a first plane. The drive shaft has a locating feature for a counterweight. The locating feature is aligned in either the first plane or a second plane parallel to the first plane.

First claim

What is claimed is:

1. A method of compressing refrigerant fluid using a scroll compressor, the method comprising:
aligning a movable scroll body having a first set of spiral scroll ribs to engage a second set of spiral scroll ribs on a fixed scroll body, wherein the relative movement of the movable and fixed scroll bodies compresses refrigerant fluid within the first and second sets of spiral scroll ribs;
driving the movable scroll body with a drive pin having a drive surface of a drive shaft, wherein the driving occurs along a first plane;
locating and aligning a counterweight on the drive shaft with a locating feature on the drive shaft, the locating feature aligned with the first plane or with a second plane parallel to the first plane.

2. The method of claim 1 , wherein the drive pin having a drive surface comprises the drive pin having a generally flat drive surface.

3. The method of claim 1 , wherein the drive pin having a drive surface comprises the drive pin having a rounded drive surface.

4. The method of claim 1 , wherein the drive pin having a drive surface comprises the drive pin having a generally rectangular drive surface.

5. The method of claim 1 , wherein the drive shaft with its locating feature for the counterweight comprises the drive shaft further including a generally flat locating feature for a counterweight.

6. The method of claim 1 , wherein the drive shaft with its locating feature for the counterweight comprises the drive shaft further including a slightly rounded locating feature for a counterweight.

7. The method of claim 1 , wherein the drive shaft with its locating feature for the counterweight comprises the drive shaft further including a generally rectangular locating feature for a counterweight.

8. The method of claim 1 , wherein driving the movable scroll body with a drive surface of a drive shaft comprises driving the movable scroll body using a drive shaft with an offset drive pin that is eccentric with respect to a longitudinal axis of the drive shaft; and
wherein the drive surface is located in a first plane and the locating feature is located in a second plane parallel to the first plane, the second plane located radially farther from the longitudinal axis than the first plane.

9. A scroll compressor comprising:
a housing;
scroll compressor bodies disposed in the housing, the scroll compressor bodies including a first scroll body and a second scroll body, the first and second scroll bodies having respective bases and respective scroll ribs that project from respective bases, wherein the scroll ribs mutually engage, the second scroll body being movable relative to the first scroll body for compressing fluid; and
a drive unit configured to rotate a drive shaft about an axis to drive the second scroll body in an orbital path, the drive shaft having an eccentric drive configured to engage a corresponding drive hub on the second scroll body;
wherein, the eccentric drive has a drive surface acting on the corresponding drive hub in a first plane, the drive shaft having a locating feature for a counterweight, the locating feature being aligned in either the first plane or aligned in a second plane parallel to the first plane.

10. The scroll compressor of claim 9 , wherein the locating feature is a generally flat surface spaced axially from, and in proximity to, the drive surface.

11. The scroll compressor of claim 10 , further including the counterweight mounted to the drive shaft, the counterweight having a generally flat surface that abuts the locating feature to align and locate the counterweight relative to the drive surface.

12. The scroll compressor of claim 10 , wherein the locating feature is a generally rectangular surface.

13. The scroll compressor of claim 9 , wherein the drive surface is a generally flat surface spaced axially from, and in proximity to, the locating feature.

14. The scroll compressor of claim 13 , wherein the eccentric drive is an eccentric drive pin projecting axially from an end of the drive shaft and offset from the drive shaft axis, the second scroll body having a hub for receiving the drive pin, and further including a slider block configured to mount to the drive pin of the drive shaft, the slider block having an inner peripheral surface that includes a generally flat surface portion that abuts the drive surface, the abutment being in the first plane.

15. The scroll compressor of claim 13 , wherein the drive surface is a generally rectangular surface.

16. The scroll compressor of claim 9 , wherein the eccentric drive is an offset drive pin that is eccentric with respect to a longitudinal axis of the drive shaft, and wherein the second plane is spaced radially farther from the longitudinal axis than the first plane.

17. The scroll compressor of claim 9 , wherein the locating feature is a rounded surface spaced axially from, and in proximity to, the drive surface.

18. The scroll compressor of claim 17 , wherein the first or second plane is tangential to an apex of the slightly rounded locating feature.

19. The scroll compressor of claim 17 , further including the counterweight mounted to the drive shaft, the counterweight having a generally flat surface that abuts the locating feature along the first or second plane to align and locate the counterweight relative to the drive surface.

20. The scroll compressor of claim 9 , wherein the drive surface is a rounded surface spaced axially from, and in proximity to, the locating feature.

21. The scroll compressor of claim 20 , wherein the first plane is tangential to an apex of the slightly rounded drive surface.

22. The scroll compressor of claim 20 , wherein the eccentric drive is an eccentric drive pin projecting axially from an end of the drive shaft and offset from the drive shaft axis, the second scroll body having a hub for receiving the drive pin, and further including a slider block configured to mount to the drive pin of the drive shaft, the slider block having an inner peripheral surface that includes a generally flat surface portion that abuts the drive surface, the abutment being in the first plane.

Assignees

• Duppert Ronald J
• Bitzer Kuehlmaschinenbau Gmbh

Inventors

• Duppert Ronald J

Classifications

• F04C23/008 Primary

  Hermetic pumps · CPC title

• F04C2240/60

  Shafts · CPC title

• F04C29/0057

  for eccentric movement · CPC title

• F04C18/0215

  where only one member is moving · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title