Connecting Rod-Piston Assembly Comprising a Connecting Rod Having a Spherical Small End

Patent metadata

Field	Value
Publication number	US-2016341189-A1
Application number	US-201515112604-A
Country	US
Kind code	A1
Filing date	Feb 3, 2015
Priority date	Feb 3, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

The present invention relates to a connecting rod comprising a small spherical end having a ball and a main rod. The ball and the main rod are designed as individual parts and form, when assembled, a connecting rod having a spherical small end.

First claim

1 . A connecting rod having a spherical small end comprising a ball and a connecting-rod member, characterized in that the ball and the connecting-rod member are designed as individual parts and, when assembled, form a connecting rod having a spherical small end.

2 . The connecting rod as claimed in claim 1 , wherein the connecting-rod member and/or the ball are each produced by a powder-metallurgical process, in particular by sintering.

3 . The connecting rod as claimed in claim 1 , wherein after assembly to form a connecting rod having a spherical small end, the ball and the connecting-rod member are secured against separation with the aid of a nonpositive connection, in particular using a snap ring, and/or with the aid of an integrally bonded connection, in particular by welding, brazing or adhesive bonding.

4 . The connecting rod as claimed in claim 1 , characterized in that the connecting-rod member has, at its side facing the ball, a journal, in particular a T-journal, and the ball has an opening for receiving the journal.

5 . A connecting rod-piston assembly comprising a piston and a connecting rod having a spherical small end as claimed in claim 1 , wherein the connecting rod comprises a ball and the ball is inserted into the piston, wherein the connecting rod-piston assembly has a securing element, preferably a ring, which secures the ball against falling out of the piston.

6 . The connecting rod-piston assembly as claimed in claim 5 , wherein the securing element covers the ball in the piston.

7 . The connecting rod-piston assembly as claimed in claim 5 , wherein the securing element is formed in one part or from at least two parts.

8 . The connecting rod-piston assembly as claimed in claim 5 , wherein in order to secure the ball, the piston and the securing element are connected to one another in an integrally bonded manner, in particular by welding, brazing or adhesive bonding, or positively, in particular by flanging.

9 . The connecting rod-piston assembly as claimed in claim 5 , wherein the piston and/or the securing element are each produced by a powder-metallurgical process, in particular by sintering.

10 . The connecting rod-piston assembly as claimed in claim 5 , wherein in order to reduce the friction between the piston and the ball, lubrication, preferably an oil impregnation or a dry lubricant, is present.

11 . The connecting rod-piston assembly as claimed in claim 10 , wherein the dry lubricant comprises graphite, wherein the proportion of the graphite in the base powder of the ball is preferably in an amount of 1 percent by weight to 50 percent by weight, particularly preferably in an amount of 1.5 percent by weight to 25 percent by weight, in particular in an amount of 2 percent by weight to 15 percent by weight.

12 . A method for producing a connecting rod-piston assembly having a piston, a ball and a connecting-rod member, comprising the following steps:
assembling the connecting-rod member with the ball to form a connecting rod having a spherical small end, putting together the ball and piston.

13 . The method as claimed in claim 12 , wherein the connecting rod-piston assembly further comprises a securing element and the method further comprises the following step:
securing the ball in the piston, preferably by means of the securing element.

14 . The method for producing a connecting rod-piston assembly as claimed in claim 12 , wherein after assembly to form a connecting rod having a spherical small end, the ball and the connecting-rod member are secured against separation with the aid of a nonpositive connection, in particular using a snap ring, or with the aid of an integrally bonded connection, in particular by welding, brazing or adhesive bonding, and/or the piston and the securing element are connected to one another in an integrally bonded manner, in particular by brazing, welding or adhesive bonding, or positively, in particular by flanging.

15 . The use of a connecting rod-piston assembly as claimed in claim 5 in a refrigerant compressor.

Assignees

• Gkn Sinter Metals Engineering Gmbh

Inventors

• Casellas Antonio
• Innerbichler Matthias
• Innerhofer Norbert

Classifications

• F16J1/22 Primary

  with universal joint, e.g. ball-joint · CPC title

• F04B39/0022 Primary

  piston rods · CPC title

• F16J7/00

  Piston-rods · CPC title