Compressor and crankshaft-connecting rod assembly

Patent metadata

Field	Value
Publication number	US-2016108908-A1
Application number	US-201514879694-A
Country	US
Kind code	A1
Filing date	Oct 9, 2015
Priority date	Oct 20, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

A compressor may include a shell, a crankshaft, a piston and a connecting rod. The shell may define a cylinder. The crankshaft is supported for rotation relative to the shell. The piston reciprocates within the cylinder in response to rotation of the crankshaft. The piston and the cylinder define a compression chamber therebetween. The connecting rod includes a first bushing rotatably coupled to the piston and a second bushing rotatably coupled to the crankshaft. The second bushing may include a driving surface contacting the crankshaft and having a recess formed therein. The recess receives an insert.

First claim

What is claimed is:

1 . A compressor comprising:
a shell defining a cylinder; a crankshaft supported for rotation relative to said shell; a piston reciprocating within said cylinder in response to rotation of said crankshaft, said piston and said cylinder defining a compression chamber therebetween; and a connecting rod including a first bushing rotatably coupled to said piston and a second bushing rotatably coupled to said crankshaft, said second bushing including a driving surface contacting said crankshaft and having a recess formed therein, said recess receiving an insert.

2 . The compressor of claim 1 , wherein said insert extends only partially around a rotation axis of said second bushing.

3 . The compressor of claim 1 , wherein said insert contacts said crankshaft.

4 . The compressor of claim 1 , wherein said insert is formed from a different material than said driving surface.

5 . The compressor of claim 4 , wherein said insert is formed from a material having a higher lubricity than a material of said driving surface.

6 . The compressor of claim 5 , wherein said insert is formed from a polymeric material.

7 . The compressor of claim 5 , wherein said insert is formed from an unleaded bearing alloy.

8 . The compressor of claim 1 , wherein said insert includes a first lubricant bore in fluid communication with a second lubricant bore extending through said second bushing.

9 . The compressor of claim 1 , wherein at least a portion of said insert is aligned with a longitudinal axis of said connecting rod.

10 . The compressor of claim 9 , wherein opposing edges of said insert are angularly spaced apart from said longitudinal axis such that said longitudinal axis extends through a central portion of said insert.

11 . The compressor of claim 9 , wherein another portion of said insert is angularly spaced apart from said longitudinal axis by thirty degrees.

12 . The compressor of claim 9 , wherein another portion of said insert is angularly spaced apart from said longitudinal axis by sixty degrees.

13 . The compressor of claim 9 , wherein another portion of said insert is angularly spaced apart from said longitudinal axis by an angle between thirty and sixty degrees.

14 . The compressor of claim 1 , wherein a surface of said insert is flush with said driving surface.

15 . The compressor of claim 1 , wherein said insert extends through first and second opposing axial ends of said second bushing.

16 . The compressor of claim 1 , wherein the connecting rod is cast around the insert.

17 . A reciprocating compressor comprising a crankshaft, a piston reciprocating within a cylinder in response to rotation of said crankshaft, and a connecting rod, said piston and said cylinder defining a compression chamber therebetween, said connecting rod including a first bushing coupled to said piston and a second bushing coupled to said crankshaft, said first and second bushings each including a driving surface formed of a first material, said first bushing contacting a piston pin, said second bushing contacting said crankshaft, said driving surface of one of said first and second bushings having a recess formed therein in which an insert is received, said insert being formed from a second material.

18 . The reciprocating compressor of claim 17 , wherein said insert is formed from a material including an additive selected from the group consisting of: ZnS, CaF 2 , graphite, PTFE and MoS 2 .

19 . The reciprocating compressor of claim 17 , wherein a surface of said insert is flush with said driving surface.

20 . The reciprocating compressor of claim 17 , wherein the connecting rod is cast around the insert.

21 . A compressor comprising an insert received in a recess in a surface contacting a crankshaft connected to a piston by a connecting rod, wherein said piston reciprocates within a cylinder upon rotation of said crankshaft, said piston and said cylinder defining a compression chamber.

22 . The compressor of claim 21 , wherein said surface is a driving surface of a bushing of said connecting rod.

23 . The compressor of claim 22 , wherein said insert is flush with said driving surface.

Assignees

• Emerson Climate Technologies

Inventors

• Ruxanda Roxana E L
• Korte Steve
• Cole James Leroy
• Baker Steven James

Classifications

• F04B39/128

  Crankcases · CPC title

• F04B39/0094

  crankshaft · CPC title

• F04B39/0005 Primary

  adaptations of pistons · CPC title

• F16C9/04

  Connecting-rod bearings; Attachments thereof · CPC title

• F04B39/0022

  piston rods · CPC title