Reciprocating compressor

Patent metadata

Field	Value
Publication number	US-9441619-B2
Application number	US-201414208317-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 29, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A reciprocating compressor including a casing which has first and second cylinders, an electric motor which has a drive shaft mounted in the casing, first and second pistons fittingly inserted into the first and second cylinders respectively, so as to reciprocate therein, and first and second connecting rods attached to the first and second pistons, respectively, at ends thereof and which are situated in the crank chamber at the other ends thereof where first and second bearings are provided, respectively. A crank member is provided on the drive shaft within the crank chamber, and the crank member is fittingly inserted into the first bearing of the first connecting rod and the second bearing of the second connecting rod. The crank member has a positioning member which positions the first and second bearings with respect to an axial direction.

First claim

What is claimed is:

1. A reciprocating compressor comprising:
a casing including a crank case, a first cylinder and a second cylinder, the first and second cylinders being disposed so as to surround a crank chamber of the crank case;
a rotating shaft which is mounted rotatably in the casing;
a driving device which is connected to one end side of the rotating shaft, wherein the rotating shaft rotates in response to rotation of the driving device;
first and second pistons which are fittingly inserted in the first and second cylinders, respectively, so as to reciprocate therein;
a first connecting rod having an end portion attached to the first piston, and an opposite end portion situated in the crank chamber where a first bearing is provided;
a second connecting rod having an end portion attached to the second piston, and an opposite end situated in the crank chamber where a second bearing is provided;
a first shaft portion which is inserted into the first bearing and is provided at the other end side of the rotating shaft;
a connecting member which is fittingly inserted into the second bearing and is provided at a distal end portion of the first shaft portion, wherein:
the connecting member includes a cylindrical shaft portion which is inserted into the second bearing for direct support of the second bearing and a fixing portion which protrudes from an end of the cylindrical shaft portion and is fixed to the first shaft portion;
the connecting member positions the second bearing at the first shaft portion in the axial direction of the connecting member; and
the axis of the first bearing and the axis of the second bearing deviate from the axis of the rotating shaft.

2. The reciprocating compressor according to claim 1 , wherein an axis of the first shaft portion and an axis of the connecting member are made to differ from each other.

3. The reciprocating compressor according to claim 1 , wherein
an eccentric member is provided between the first shaft portion and the first bearing, the eccentric member being formed as an annular member and having an axis deviating from the axis of the first shaft portion, the first bearing being received on the eccentric member.

4. The reciprocating compressor according to claim 2 , wherein
an eccentric member is provided between the first shaft portion and the first bearing, the eccentric member being formed as an annular member having an axis deviating from the axis of the first shaft portion, the first bearing being received on the eccentric member.

5. The reciprocating compressor according to claim 1 , wherein
the second cylinder is a low-pressure cylinder which takes in gas of low pressure to discharge compressed gas of intermediate pressure, and the first cylinder is a high-pressure cylinder which takes in the gas of intermediate pressure to discharge compressed gas of high pressure.

6. The reciprocating compressor according to claim 2 , wherein
the second cylinder is a low-pressure cylinder which takes in gas of low pressure to discharge compressed gas of intermediate pressure, and the first cylinder is a high-pressure cylinder which takes in the gas of intermediate pressure to discharge compressed gas of high pressure.

7. The reciprocating compressor according to claim 3 , wherein
the second cylinder is a low-pressure cylinder which takes in gas of low pressure to discharge compressed gas of intermediate pressure, and the first cylinder is a high-pressure cylinder which takes in the gas of intermediate pressure to discharge compressed gas of high pressure.

8. The reciprocating compressor according to claim 1 , wherein both the first piston and the second piston are configured as an oscillating piston.

9. The reciprocating compressor according to claim 2 , wherein both the first piston and the second piston are configured as an oscillating piston.

10. The reciprocating compressor according to claim 3 , wherein both the first piston and the second piston are configured as an oscillating piston.

11. The reciprocating compressor according to claim 1 , wherein the axis of the second bearing is coaxial to the axis of the connecting member.

12. The reciprocating compressor according to claim 1 , wherein the axis of the first shaft portion deviates from the axis of the rotating shaft.

13. The reciprocating compressor according to claim 1 , wherein the axis of the first shaft portion is coaxial to the axis of the rotating shaft.

14. The reciprocating compressor according to claim 13 , wherein an eccentric member is provided between the first shaft portion and the first bearing, the eccentric member being formed as an annular member and having an axis deviating from the axis of the first shaft portion.

15. The reciprocating compressor according to claim 3 , wherein the axis of the eccentric member and the axis of the connecting member are made to differ from each other.

16. The reciprocating compressor according to claim 14 , wherein the axis of the eccentric member and the axis of the connecting member are made to differ from each other.

17. The reciprocating compressor according to claim 1 , wherein the connecting member includes an external thread portion which is formed as the fixing portion, and a head portion which is formed by expanding diametrically the other end of the cylindrical shaft portion.

18. The reciprocating compressor according to claim 1 , wherein the connecting member includes a pin which is formed as the fixing portion, and a head portion which is formed by expanding diametrically the other end of the cylindrical shaft portion.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Ito Tsutomu
• Yamanaka Teruaki

Classifications

• F04B53/147

  Mounting or detaching of piston rod · CPC title

• F04B35/01

  the means being mechanical · CPC title

• F04B25/005

  with two cylinders · CPC title

• F04B39/0022

  piston rods · CPC title

• F04B27/02 Primary

  having cylinders arranged oppositely relative to main shaft · CPC title