Engine cylinder liner arrangement

A cylinder lining is inserted into a cylinder block of an internal-combustion engine with an upper collar of the disposed in a recess in the cylinder block. To hold the lining in place, a ring is prestressingly inserted from above into an opening in the collar between the liner and the cylinder block recess wall. In order to prevent radial movements between the collar of the lining and the cylinder block, the ring that is formed as a clamping ring and the interior surface of which is developed as a conical surface with the same slope is pressed in between the conically formed outer wall of the collar of the lining and the recess.

BACKGROUND AND SUMMARY OF THE INVENTION 
This invention relates to a cylinder liner arrangement for an 
internal-combustion engine. More particularly the present invention is 
related to an improved liner arrangement of the type including 
prestressing a ring to hold a cylinder lining in a cylinder block. 
In the case of a cylinder lining of this type that is described in German 
Published Unexamined Patent Application (DE-OS) No. 1 175 176, a 
thin-walled ring, with slight prestressing, is shrunk onto a collar of the 
lining on the outside. It has the purpose of preventing that cooling water 
flows out of a ring groove in the collar of the lining. 
The invention is based on the objective of preventing, or at least reducing 
to a minimum, radial movements between the cylinder lining and the 
cylinder block which are caused by the normal force of the piston and the 
gas pressure in the upper part of the cylinder, and which radial movements 
result in wear or abrasion in the bearing of the collar of the lining on 
the cylinder block. 
According to the invention, this objective is achieved by providing an 
arrangement wherein a conical surface is provided on the exterior edge of 
the lining collar which is sloped inwardly in the upward direction, and 
wherein the ring formed as a clamping ring is provided on its inner 
surface with similar slope as the ring collar edge, the ring being pressed 
in place between a recess in the cylinder block and the collar conical 
surface. 
The clamping ring pressed in between the collar of the lining and the 
cylinder block causes a radial support between these two parts so that 
forces affecting the collar of the lining radially are completely absorbed 
by the cylinder block. Simultaneously, the collar of the lining, by means 
of the pressed-in clamping ring, is axially pressed firmly onto its 
bearing surface in the cylinder block. Both measures prevent a radial 
movement between the collar of the lining and the cylinder block which may 
result in wear in the bearing surface of the collar of the lining on the 
cylinder block. In addition, the clamping ring, as a metallic bridge, also 
improves the heat discharge from the collar of the lining to the cylinder 
block. 
In especially preferred embodiments resulting in a self-locking fastening 
of the clamping ring the collar conical surface and the interior surface 
of the clamping ring are sloped at about 6.degree. with respect to lines 
parallel to the reciprocating axis of the piston in the cylinder block and 
lining arrangement. 
Further objects, features, and advantages of the present invention will 
become more apparent from the following description when taken with the 
accompanying drawing which shows, for purposes of illustration only, an 
embodiment in accordance with the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS 
In a cylinder block 1 of a reciprocating piston internal-combustion engine 
that is not shown in detail, a cylinder lining 2 is inserted. At the upper 
end of the cylinder lining 2 a collar 3 is provided. Collar 3 is provided 
with a bearing surface 4 which rests on a base 5 of a recess 6 in the 
cylinder block 1. The collar 3 of the lining, in its upper half on the 
outside, is provided with a conical surface 7 which is sloped at an angle 
of a little less than 6.degree. upwardly and inwardly in the direction of 
the cylinder shaft. A clamping ring 9 is pressed from the top into the 
space 8 between the conical surface 7 and the cylinder block 1, the 
interior surface 10 of the clamping ring has the same slope as the conical 
surface 7 of the collar 3 of the lining. Thus the collar 3 of the lining 
with its bearing surface 4 is pressed firmly onto the cylinder block 1, 
and a radial support of the collar 3 of the lining at the cylinder block 1 
is achieved via the clamping ring 9 so that movements in the radial 
direction between the collar 3 of the lining and the cylinder block 1 and 
thus a wearing of the bearing surface 4 and of the base surface 5 are 
prevented. 
The interior surface 10 and the exterior surface 11 of the clamping ring 9 
have galvanic coatings 12 made of a soft metal, such as tin, in 
particularly preferred embodiments. This facilitates the pressing-in of 
the clamping ring 9 and further improves the contact of the clamping ring 
9 with the collar 3 of the lining and the cylinder block even more. 
Although the present invention has been described and illustrated in 
detail, it is to be clearly understood that the same is by way of 
illustration and example only, and is not to be taken by way of 
limitation. The spirit and scope of the present invention are to be 
limited only by the terms of the appended claims.