Connecting rod and internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016258478-A1
Application number	US-201615056274-A
Country	US
Kind code	A1
Filing date	Feb 29, 2016
Priority date	Mar 5, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

A connecting rod ( 10 ) has a big end bearing eye ( 11 ) for attachment to a crankshaft, a small end bearing eye ( 12 ) for attachment to a piston, and an eccentric adjusting device ( 13 ) for adjusting an effective connecting rod length. The eccentric adjusting device ( 13 ) has eccentric rods ( 15, 16 ) that engage on an eccentric lever ( 14 ), an eccentric ( 36 ) that is guided in an aperture in the eccentric lever ( 14 ) and in the small end bearing eye ( 12 ) and an aperture for accommodating a piston pin ( 37 ). Lubricating oil bores ( 38, 39 ) are introduced into the small end bearing eye ( 12 ) via which a lubricating oil film can be built up between the small end bearing eye ( 12 ) and the eccentric ( 36 ). The small end bearing eye ( 12 ) has a larger radial wall thickness in those regions in which the lubricating oil bores ( 38, 39 ).

First claim

What is claimed is:

1 . A connecting rod, having a big end bearing eye for attachment to a crankshaft, a small end bearing eye for attachment to a piston of a cylinder, and an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having eccentric rods that engage on an eccentric lever of the eccentric adjusting device, and the eccentric adjusting device having an eccentric that is guided in an aperture in the eccentric lever and in the small end bearing eye and that has an aperture for accommodating a piston pin, lubricating oil bores being introduced into the small end bearing eye via which a lubricating oil film can be built up between the small end bearing eye and the eccentric, the small end bearing eye having a larger radial wall thickness in those regions in which the lubricating oil bores are introduced into said bearing eye than in adjoining regions of said bearing eye.

2 . The connecting rod of claim 1 , wherein at least two of the lubricating oil bores are introduced into the small end bearing eye, the lubricating oil bores extend in the radial direction of the small end bearing eye and are spaced apart in a circumferential direction of the small end bearing eye, the small end bearing eye having a larger radial wall thickness in those regions in which the lubricating oil bores are introduced into the bearing eye than in a region between these regions as seen in the circumferential direction of the small end bearing eye.

3 . The connecting rod of claim 2 , wherein the small end bearing eye has a smaller radial wall thickness in regions that lie directly opposite or face the extended eccentric rods of the eccentric adjusting device than in regions in which the lubricating oil bores are introduced into the small end bearing eye.

4 . The connecting rod of claim 1 , wherein transitions on the small end bearing eye between the regions of different wall thickness are formed continuously and in a manner free from discontinuities.

5 . An internal combustion engine which has an adjustable compression ratio, having at least one cylinder and having a crankshaft, on which at least one connecting rod engages, wherein the at least one connecting rod has a big end bearing eye attached to the crankshaft, a small end bearing eye attached to a piston of the at least one cylinder and an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having an eccentric that interacts with an eccentric lever, and eccentric rods that engage on the eccentric lever and are acted upon by a hydraulic pressure prevailing in hydraulic chambers interacting with the eccentric rods, lubricating oil bores being introduced into the small end bearing eye via which a lubricating oil film can be built up between the small end bearing eye and the eccentric, the small end bearing eye having a larger radial wall thickness in those regions in which the lubricating oil bores are introduced into said bearing eye than in adjoining regions of said bearing eye.

Assignees

• Porsche Ag

Inventors

• Paul Michael

Classifications

• F16H57/0471

  Bearing · CPC title

• F02B75/045 Primary

  by means of a variable connecting rod length · CPC title

• F16C7/06 Primary

  Adjustable connecting-rods · CPC title

• F16C33/1045

  Details of supply of the liquid to the bearing · CPC title

• F16C23/10

  Bearings, parts of which are eccentrically adjustable with respect to each other · CPC title