Systems and methods for coupling a cylinder head to a cylinder block

Patent metadata

Field	Value
Publication number	US-11067029-B2
Application number	US-201816050596-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Jul 31, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An internal combustion engine includes a cylinder head and a cylinder block. The cylinder head includes a first boss cylinder head conduit portion and a first boss cylinder head cavity portion. The first boss cylinder head conduit portion is configured to receive a first fastener without threadably engaging the first fastener. The first boss cylinder head conduit portion has a first diameter. The first boss cylinder head cavity portion is aligned with the first boss cylinder head conduit portion. The first boss cylinder head cavity portion is configured to receive the first fastener without threadably engaging the first fastener. The first boss cylinder head cavity portion has a second diameter greater than the first diameter. The cylinder block is coupled to the cylinder head. The cylinder block includes a first boss cylinder block threaded portion.

First claim

What is claimed is:

1. An internal combustion engine comprising:
a cylinder head defined by an exhaust side and an intake side opposite the exhaust side, the cylinder head comprising:
a first boss cylinder head conduit portion disposed proximate the exhaust side and configured to receive a first fastener without threadably engaging the first fastener, the first boss cylinder head conduit portion having a first diameter;
a first boss cylinder head cavity portion aligned with the first boss cylinder head conduit portion and configured to receive the first fastener without threadably engaging the first fastener, the first boss cylinder head cavity portion having a first spacing greater than the first diameter;
a second boss cylinder head conduit portion disposed proximate the intake side and configured to receive a second fastener without threadably engaging the second fastener, the second boss cylinder head conduit portion having a second diameter; and
a second boss cylinder head cavity portion aligned with the second boss cylinder head conduit portion and configured to receive the second fastener without threadably engaging the second fastener, the second boss cylinder head cavity portion having a second spacing greater than the second diameter;

a cylinder block coupled to the cylinder head, the cylinder block comprising a first boss cylinder block threaded portion aligned with the first boss cylinder head conduit portion, the first boss cylinder block threaded portion configured to threadably engage the first fastener;
wherein the first fastener does not threadably engage the cylinder head when: the first fastener is received in the first boss cylinder head cavity portion, the first fastener is received in the first boss cylinder head cavity portion, and the first fastener is threadably engaged with the first boss cylinder block threaded portion.

2. The internal combustion engine of claim 1 , wherein the cylinder block further comprises a second boss cylinder block threaded portion aligned with the second boss cylinder head conduit portion, the second boss cylinder block threaded portion configured to threadably engage the second fastener.

3. The internal combustion engine of claim 2 , wherein the cylinder block further comprises a first boss cylinder block cavity portion aligned with the first boss cylinder head conduit portion, the first boss cylinder block cavity portion configured to receive the first fastener without threadably engaging the first fastener.

4. The internal combustion engine of claim 3 , wherein:
a cylinder head-block interface is defined between the cylinder head and the cylinder block;
the first boss cylinder head cavity portion is contiguous with the cylinder head-block interface; and
the second boss cylinder head cavity portion is contiguous with the cylinder head-block interface.

5. The internal combustion engine of claim 4 , wherein:
the first boss cylinder block cavity portion is contiguous with the cylinder head-block interface; and
the second boss cylinder block cavity portion is contiguous with the cylinder head-block interface.

6. The internal combustion engine of claim 1 , wherein the cylinder block further comprises a first boss cylinder block cavity portion aligned with the first boss cylinder head conduit portion, the first boss cylinder block cavity portion configured to receive the first fastener without threadably engaging the first fastener.

7. The internal combustion engine of claim 6 , wherein:
a cylinder head-block interface is defined between the cylinder head and the cylinder block;
the first boss cylinder head cavity portion is contiguous with the cylinder head-block interface; and
the first boss cylinder block cavity portion is contiguous with the cylinder head-block interface.

8. The internal combustion engine of claim 1 , wherein the cylinder head further comprises a main cavity contiguous with the first boss cylinder head conduit portion and the first boss cylinder head cavity portion, the main cavity configured to receive the first fastener without threadably engaging the first fastener, the main cavity separating the first boss cylinder head conduit portion from the first boss cylinder head cavity portion.

9. The internal combustion engine of claim 1 , wherein:
the first boss cylinder head cavity portion is non-circular; and
the second boss cylinder head cavity portion is non-circular.

10. An internal combustion engine comprising:
a cylinder head defined by an intake side and an exhaust side, the cylinder head comprising:
a first boss cylinder head conduit portion centered on a first boss axis, the first boss cylinder head conduit portion separated from the first boss axis by a first spacing;
a first boss cylinder head cavity portion aligned with the first boss cylinder head conduit portion, the first boss cylinder head cavity portion separated from the first boss axis by a second spacing greater than the first spacing;
a second boss cylinder head conduit portion centered on a second boss axis, the second boss cylinder head conduit portion separated from the second boss axis by a third spacing; and
a second boss cylinder head cavity portion aligned with the second boss cylinder head conduit portion, the second boss cylinder head cavity portion separated from the second boss axis by a fourth spacing greater than the third spacing;

a cylinder block coupled to the cylinder head, the cylinder block comprising:
a first boss cylinder block cavity portion aligned with the first boss cylinder head conduit portion, the first boss cylinder block cavity portion separated from the first boss axis by the second spacing; and
a first boss cylinder block threaded portion aligned with the first boss cylinder head conduit portion, the first boss cylinder block threaded portion separated from the first boss axis by a fifth spacing less than the second spacing; and

a first fastener received within the first boss cylinder head conduit portion, the first boss cylinder head cavity portion, the first boss cylinder block cavity portion, and the first boss cylinder block threaded portion, the first fastener engaging the first boss cylinder block threaded portion, the first fastener not engaging the first boss cylinder head conduit portion, the first boss cylinder head cavity portion, or the first boss cylinder block cavity portion;
a second fastener received within the second boss cylinder head conduit portion and the second boss cylinder head cavity portion, the second fastener not engaging the second boss cylinder head conduit portion or the second boss cylinder head cavity portion;
wherein the first boss cylinder head conduit portion is disposed between the intake side and the second boss cylinder head conduit portion; and
wherein the second boss cylinder head conduit portion is disposed between the exhaust side and the first boss cylinder head conduit portion.

11. The internal combustion engine of claim 10 ,
wherein the cylinder block further comprises:
a second boss cylinder block cavity portion aligned with the second boss cylinder head conduit portion, the second boss cylinder block cavity portion separated from the second boss axis by the fifth spacing; and
a second boss cylinder block threaded portion aligned with the second boss cylinder head conduit portion, the second boss cylinder block threaded portion separated from the second boss axis by a sixth spacing less than the fifth spacing; and

the second fastener is additionally received the second boss cylinder block threaded portion and the second boss cylinder block cavity portion, the second fastener engaging the second boss cylinder block threaded portion, the second

Assignees

• Cummins Inc

Inventors

• Barnes David M
• Eckroth David J

Classifications

• F02F1/102 Primary

  Attachment of cylinders to crankcase · CPC title

• F02F11/002

  involving cylinder heads · CPC title

• F02F7/0021

  Construction · CPC title

• F02F1/42

  Shape or arrangement of intake or exhaust channels in cylinder heads · CPC title

• F02F1/40

  cylinder heads with means for directing, guiding, or distributing liquid stream · CPC title