Cylinder liner, block manufacturing method and cylinder liner manufacturing method

Patent metadata

Field	Value
Publication number	US-10876494-B2
Application number	US-201916546449-A
Country	US
Kind code	B2
Filing date	Aug 21, 2019
Priority date	Aug 22, 2018
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A cylinder liner that is casted in a block and defines a cylinder bore corresponding to one cylinder includes: a cylindrical liner body; a projection part provided so as to include a plurality of projections on an outer peripheral surface of a part of the liner body; and a bore adjacent part formed such that the outer peripheral surface at an upper side end of the liner body is positioned more on an inner side of the liner body than the outer peripheral surface below the upper side end, and the projections are absent on at least a part of the outer peripheral surface at the upper side end, in a predetermined range of the outer peripheral surface of the liner body, which faces another cylinder bore to be adjacent when casted in the block.

First claim

The invention claimed is:

1. A cylinder liner that is casted in a block and defines a cylinder bore corresponding to one cylinder, comprising:
a cylindrical liner body;
a projection part provided so as to include a plurality of projections on an outer peripheral surface of a part of the liner body;
a bore adjacent part formed such that the outer peripheral surface at an upper side end of the liner body is positioned more on an inner side of the liner body than the outer peripheral surface below the upper side end, and the projections are absent on at least a part of the outer peripheral surface at the upper side end, in a predetermined range of the outer peripheral surface of the liner body, which faces another cylinder bore to be adjacent when casted in the block; and,
a positioning part provided so as to be at a predetermined relative position to the bore adjacent part such that the bore adjacent part is positioned at a predetermined position facing the other adjacent cylinder bore when casted in the block,
wherein the bore adjacent part is provided in a pair at one side face part and the other side face part positioned on an opposite side of the one side face part across a center axis of the liner body, at the upper side end, and
the positioning part is provided on a part corresponding to at least one of the one side face part and the other side face part at a lower side end of the liner body.

2. The cylinder liner according to claim 1 ,
wherein the positioning part is provided in a pair at respective lower parts of the one side face part and the other side face part at the lower side end of the liner body, and
the bore adjacent parts and the positioning parts are provided such that a virtual line defined by connecting the bore adjacent parts provided in the pair and a virtual line defined by connecting the positioning parts provided in the pair cross at an angle of 0 degrees to 90 degrees in an upper view of the liner body.

3. The cylinder liner according to claim 2 , wherein the virtual line defined by connecting the bore adjacent parts provided in the pair and the virtual line defined by connecting the positioning parts provided in the pair overlap in the upper view of the liner body.

4. A method of manufacturing a block for a multi-cylinder engine using a plurality of cylinder liners according to claim 3 , the method comprising:
a step of positioning the plurality of cylinder liners on a predetermined straight line by bringing the positioning part of each of the plurality of cylinder liners into contact with a straight positioning shaft;
a step of casting a body side of the block to the plurality of positioned cylinder liners; and
a step of forming a passage where a cooling medium flows at a position held between the bore adjacent parts that the corresponding two cylinder liners respectively have, between the adjacent cylinder bores defined by the cylinder liners, in the body of the block after being casted.

5. A manufacturing method of a cylinder liner that is casted in a block and defines a cylinder bore corresponding to one cylinder, the cylinder manufacturing method comprising:
a step of casting a basic member of a cylindrical liner body including a plurality of projections on an outer peripheral surface;
a step of providing a machining reference surface to the basic member of the liner body;
a step of determining a first part at an upper side end of the basic member of the liner body, which faces another cylinder bore to be adjacent when casted in the block, with the machining reference surface as a reference; and
a step of cutting an outer surface of the basic member of the liner body corresponding to the first part, and forming a bore adjacent part by positioning the outer peripheral surface at the upper side end more on an inner side of the liner body than the outer peripheral surface below the upper side end and removing the projections on at least a part of the outer peripheral surface at the upper side end.

6. The cylinder liner manufacturing method according to claim 5 , further comprising:
a step of determining a second part at the lower side end of the basic member of the liner body, to be a predetermined relative position to the bore adjacent part; and
a step of cutting the basic member of the liner body corresponding to the second part in the radial direction, and forming a positioning part that positions the bore adjacent part at a predetermined position facing the other adjacent cylinder bore when casted in the block.

Assignees

• Tpr Co Ltd
• Tpr Ind Co Ltd

Inventors

• Sato Akira
• Hatakeyama Koichi

Classifications

• F02F1/108 Primary

  Siamese-type cylinders, i.e. cylinders cast together · CPC title

• F02F1/004

  Cylinder liners (F02F1/08, F02F1/16 take precedence) · CPC title

• B22D19/08

  for building-up linings or coverings, e.g. of anti-frictional metal · CPC title

• F02B75/18

  Multi-cylinder engines (scavenging aspects F02B25/00) · CPC title

• F02F1/16 Primary

  Cylinder liners of wet type · CPC title