Four-cycle multi-cylinder engine

Patent metadata

Field	Value
Publication number	US-9988978-B2
Application number	US-201615259326-A
Country	US
Kind code	B2
Filing date	Sep 8, 2016
Priority date	Oct 13, 2015
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A four-cycle multi-cylinder engine includes a crankcase, a cylinder block, a crankshaft, and a gear-shift input shaft. The crankcase is vertically divided into an upper case and a lower case. The cylinder block is integrated with the crankcase. The crankshaft and the gear-shift input shaft are journaled to a contact surface of the crankcase. The cylinder block is inclined rearward such that an extended line intersects with a cylinder axis line of the cylinder block at an acute angle in an engine side view. The extended line connects respective central axes of the crankshaft and the gear-shift input shaft.

First claim

What is claimed is:

1. A four-cycle multi-cylinder engine comprising:
a crankcase vertically divided into an upper case and a lower case;
a cylinder block integrated with the crankcase; and
a crankshaft and a counter shaft journaled to a contact surface of the upper case and the lower case, wherein
the cylinder block is inclined rearward such that an extended line intersects with a cylinder axis line of the cylinder block at an acute angle in an engine side view, the extended line connecting respective central axes of the crankshaft and the counter shaft.

2. The four-cycle multi-cylinder engine according to claim 1 , wherein
the cylinder block has a U shape at a rear surface of the cylinder block and a lower side of a water jacket, the U shape being formed on the cylinder block on the cylinder axis line side with respect to a surface formed vertically from a profile of a contact surface with a cylinder head to the contact surface of the crankcase, a starter motor being disposed on the U shape.

3. The four-cycle multi-cylinder engine according to claim 2 , wherein
the U shape is disposed at an approximate center in an engine width direction.

4. The four-cycle multi-cylinder engine according to claim 3 , further comprising
a breather chamber integrated with the upper case at a rear of the starter motor.

5. The four-cycle multi-cylinder engine according to claim 2 , further comprising
a breather chamber integrated with the upper case at a rear of the starter motor.

Assignees

• Suzuki Motor Corp

Inventors

• Oda Tomoyuki

Classifications

• F01M13/00

  Crankcase ventilating or breathing · CPC title

• B62K21/02

  Front wheel forks or equivalent, e.g. single tine · CPC title

• F01M1/00

  Pressure lubrication · CPC title

• F02B75/18

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

• F01P3/02

  Arrangements for cooling cylinders or cylinder heads · CPC title