Cooling structure of water-cooled engine

• US 10,641,200 B2
• Filed: 11/30/2017
• Issued: 05/05/2020
• Est. Priority Date: 12/28/2016
• Status: Active Grant

• Current Assignee: Kubota Corporation
• Original Assignee: Kubota Corporation
• Inventors: Oso, Hiroki, Yamazaki, Takahiro, Koyama, Hideyuki, Kaneko, Rina, Tanaka, Yoshinori, Yamaguchi, Takashi, Tanaka, Akira
• Primary Examiner(s): Dallo, Joseph J
• Assistant Examiner(s): Wang, Yi-Kai
• Application Number:
  US15/827,670
• Publication Number:
  US 20180179984A1
• Time in Patent Office: 887 Days
• Field of Search: 123 4172
• CPC Class Codes: F01P 11/04 Arrangements of liquid pipes or hoses
• CPC Class Codes: F01P 2003/021 Cooling cylinders
• CPC Class Codes: F01P 3/02 Arrangements for cooling cylinders or cylinder heads
• CPC Class Codes: F02F 1/10 for liquid cooling
• CPC Class Codes: F02F 1/14 Cylinders with means for directing, guiding or distributing liquid stream
• CPC Class Codes: F02F 2001/106 using a closed deck, i.e. the water jacket is not open at the block top face

Abstract

A cooling structure of a water-cooled engine includes: a plurality of cylinders 2 arranged in a cylinder block 1; and a water jacket W formed around the plurality of cylinders 2. The water jacket W includes a pair of main flow paths 7, 8 formed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow paths 9, 10 formed between adjacent cylinders 2 in a state of connecting the pair of main flow paths 7, 8. Guide walls 11h, 13h, capable of guiding the cooling water flowing in the main flow paths 7, 8 to the inter-bore flow paths 9, 10, are formed in the cylinder block 1.

Claims

1. A cooling structure of a water-cooled engine, comprising:

a plurality of cylinders arranged in a cylinder block; and

a water jacket formed around the plurality of cylinders,

wherein

the water jacket includes a pair of main flow paths formed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow paths formed between adjacent cylinders in a state of connecting the pair of main flow paths, and

guide walls, capable of guiding the cooling water flowing in the main flow paths to the inter-bore flow paths, are formed in the cylinder block and in a cylinder outer frame portion that surrounds the water jacket in the cylinder block, and

at least some of the guide walls are formed as arc-shaped rib walls along circumferential directions of the cylinders.

2. The cooling structure of the water-cooled engine according to claim 1, wherein the guide walls corresponding to the inter-bore flow paths, adjacent to each other in the cylinder arrangement direction, are formed in a state of guiding the cooling water to the inter-bore flow paths in opposite directions to each other.

3. The cooling structure of the water-cooled engine according to claim 1, wherein the guide walls corresponding to the inter-bore flow paths, adjacent to each other in the cylinder arrangement direction, are formed in a state of guiding the cooling water to the inter-bore flow paths in the same direction with each other.