COOLING SYSTEM FOR INTERNAL COMBUSTION ENGINE

• US 20180030880A1
• Filed: 07/26/2017
• Published: 02/01/2018
• Est. Priority Date: 07/29/2016
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Takizawa, Takuo, Soga, Taichi, Asano, Hiroto, Matsumoto, Yasuyoshi
• Granted Patent: US 10,161,293 B2
• Time in Patent Office: Days
• CPC Class Codes: F01P 11/16 concerning coolant temperature F01P11/20 takes precedence
• CPC Class Codes: F01P 2003/028 Cooling cylinders and cylinder heads in series
• CPC Class Codes: F01P 2007/146 using valves
• CPC Class Codes: F01P 2025/32 Engine outcoming fluid temperature
• CPC Class Codes: F01P 2060/04 Lubricant cooler
• CPC Class Codes: F01P 2060/045 for transmissions
• CPC Class Codes: F01P 2060/08 Cabin heater
• CPC Class Codes: F01P 2060/16 Outlet manifold
• CPC Class Codes: F01P 3/02 Arrangements for cooling cylinders or cylinder heads
• CPC Class Codes: F01P 7/16 by thermostatic control

Abstract

An engine cooling system (2) includes a first passage (11) communicating a radiator (8) with a jacket inlet (7) of a water jacket of an engine, a second passage (13) communicating a jacket outlet (12) of the water jacket with the radiator, and a third passage (16) communicating a part of the second passage with a part of the first passage located between the radiator and the water pump. To allow the cooling water temperature circulating in a water jacket of an engine to be detected accurately, a water temperature sensor (72) is provided in a part of the second passage intermediate between the part of the second passage where the third passage branches off and the jacket outlet.

Claims

1. An engine cooling system, comprising:

a water jacket formed on a main body of an internal combustion engine;

a first passage communicating a radiator with a jacket inlet of the water jacket;

a second passage communicating a jacket outlet of the water jacket with the radiator;

a water pump provided in the first passage for feeding cooling water to the water jacket inlet;

a third passage branching off from a part of the second passage to communicate the second passage with a part of the first passage located between the radiator and the water pump;

a flow control valve provided at least in one of the first passage, the second passage and the third passage for controlling a flow of the cooling water through the radiator; and

a water temperature sensor provided in a part of the second passage intermediate between the part of the second passage where the third passage branches off and the jacket outlet.

2. The engine cooling system according to claim 1, further comprising a cavity formed on a side face of the engine main body, the cavity communicating with the jacket outlet and the third passage formed in the engine main body, and a passage forming member including a tube portion and a lid portion formed at an end of the tube portion and attached to the side face of the engine main body so as to close the cavity and jointly define a chamber, the tube portion internally defining a part of the second passage directly communicating with the chamber.

3. The engine cooling system according to claim 2, wherein the chamber is elongated from a first end communicating with the jacket outlet and a second end communicating with the third passage, and the part of the second passage defined by the tube portion communicates with a part of the chamber intermediate between the first end and the second end, the water temperature sensor being positioned adjacent to the first end of the chamber.

4. The engine cooling system according to claim 3, wherein a part of the lid portion opposing the first end of the chamber is formed with a recess communicating with the part of the second passage defined by the tube portion.

5. The engine cooling system according to claim 4, wherein an open end of the part of the second passage defined by the tube portion and facing the cavity is laterally elongated.

6. The engine cooling system according to claim 5, wherein the water temperature sensor is supported by the lid portion and extends through the recess of the lid portion.

7. The engine cooling system according to claim 2, wherein the tube portion extends generally upward from the lid portion.

8. The engine cooling system according to claim 2, wherein the tube portion includes a base end portion extending substantially linearly from the lid portion and a free end portion extending from the base end portion along a curved path toward the radiator, a linear section of the base end portion of the tube portion being longer than a path of the cooling water in the cavity which the cooling water travels from the jacket outlet to the open end of the second passage.

9. The engine cooling system according to claim 2, further comprising a belt tensioner including a support member pivotally supported by the engine main body, a pulley rotatably supported by a free end of the support member and engaging an auxiliary belt of the engine, a biasing member urging the pulley toward the auxiliary belt, and a tensioner side marker affixed to a part of the support member, wherein a lid portion side marker is affixed to a part of the lid portion opposing the tensioner side marker such that an angular position of the support member relative to the engine main body may be determined by comparing positions of the two markers.

10. The engine cooling system according to claim 1, wherein the engine main body includes a cylinder block formed with the jacket inlet and the jacket outlet, and a cylinder head attached to the cylinder block, and the water jacket includes a block exhaust side water jacket formed on an exhaust side of the cylinder block and communicating with the jacket inlet, a head water jacket formed in the cylinder head and communicating with the block exhaust side water jacket, and a block intake side water jacket formed on an intake side of the cylinder block and communicating with the jacket outlet and the head water jacket.

11. The engine cooling system according to claim 10, further comprising a cavity formed on a side face of the engine main body, the cavity communicating with the jacket outlet and the third passage formed in the engine main body, and a passage forming member including a tube portion and a lid portion formed at an end of the tube portion and attached to the side face of the engine main body so as to close the cavity and jointly define a chamber, the tube portion internally defining a part of the second passage directly communicating with the chamber.

12. The engine cooling system according to claim 11, wherein the block intake side water jacket includes an arcuate passage extending along a circumference of a cylinder bore adjoining the jacket outlet, and a linear section of the base end portion of the tube portion extends in an intermediate direction between a radial direction and a tangential direction of the cylinder bore adjoining the jacket outlet.

13. The engine cooling system according to claim 1, wherein the water temperature sensor is configured to supply a signal indicating a cooling water temperature to a control unit of the engine.