Air-cooled engine

Patent metadata

Field	Value
Publication number	US-10508586-B2
Application number	US-201514960475-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Mar 31, 2015
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

An air-cooled engine capable of enhancing detection precision of a temperature sensor includes a crankcase, a crankshaft, a fan case, and an engine cooling fan. The installation direction of the crankshaft defines the front and rear direction. The fan case is provided in a front part of the crankcase, and the engine cooling fan is accommodated in the fan case. The air-cooled engine includes a cooling wind passage, a wind passage terminal end wall, an oil splashing device, and a temperature sensor. The wind passage terminal end wall is provided in a rear end of the cooling wind passage, the oil splashing device is provided on the rear side of the wind passage terminal end wall and formed to splash engine oil in the crankcase onto the wind passage terminal end wall, and the temperature sensor is attached to a front part of the wind passage terminal end wall.

First claim

What is claimed is:

1. An air-cooled engine comprising:
a crankcase;
a crankshaft;
a fan case; and
an engine cooling fan, wherein
with the installation direction of the crankshaft serving as the front and rear direction, one side of the front and rear direction serving as the front side, and the other side serving as the rear side, the fan case is provided in a front part of the crankcase, and the engine cooling fan is accommodated in the fan case,
the air-cooled engine comprising:
a temperature sensor and an oil splashing device, the temperature sensor being attached to a front part of a cooling air passage terminal end wall and coordinated with a fuel supply device adjusting an amount of a fuel supply via an electronic control device, and the oil splashing device splashing engine oil in the crankcase onto the cooling air passage terminal end wall to which the temperature sensor is attached.

2. The air-cooled engine according to claim 1 , comprising:
a sensor attachment boss; and
a sensor attachment bolt, wherein
the sensor attachment boss is provided in the wind passage terminal end wall, a rear part of the sensor attachment boss projects rearward from the wind passage terminal end wall, the sensor attachment bolt is screwed into the sensor attachment boss, and the temperature sensor is attached to the sensor attachment boss by the sensor attachment bolt.

3. The air-cooled engine according to claim 2 , comprising:
an oil guiding rib, wherein
the oil guiding rib projects rearward from the wind passage terminal end wall and is formed to guide the engine oil splashed by the oil splashing device to the rear part of the sensor attachment boss.

4. The air-cooled engine according to claim 1 , wherein
a timing transmission device is also used as the oil splashing device.

5. The air-cooled engine according to claim 1 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

6. The air-cooled engine according to claim 5 , comprising:
a wind shielding plate, wherein
the wind shielding plate is provided in an inlet of the cooling wind passage, and the temperature sensor is arranged at a position to be hidden behind the wind shielding plate when seen from the front side in the direction parallel to the installation direction of the crankshaft.

7. The air-cooled engine according to claim 6 , wherein
cooling wind introduction gaps are provided between the wind shielding plate and circumferential walls of the left and right cylinders.

8. The air-cooled engine according to claim 6 , wherein
the wind shielding plate includes a top plate part extending in an upper part of the fan case.

9. The air-cooled engine according to claim 8 , wherein
the top plate part of the wind shielding plate is made of a magnetic material.

10. The air-cooled engine according to claim 1 , wherein the electronic control device is formed to adjust an amount of fuel supplied to a combustion chamber by the fuel supply device based on a temperature detected by the electronic control device via the temperature sensor.

11. The air-cooled engine according to claim 2 , wherein
a timing transmission device is also used as the oil splashing device.

12. The air-cooled engine according to claim 3 , wherein
a timing transmission device is also used as the oil splashing device.

13. The air-cooled engine according to claim 2 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

14. The air-cooled engine according to claim 3 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

15. The air-cooled engine according to claim 4 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

16. The air-cooled engine according to claim 11 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

17. The air-cooled engine according to claim 12 , comprising:
left and right cylinders, wherein
the left and right cylinders project obliquely upward from the crankcase to form a V shape when seen in the direction parallel to the installation direction of the crankshaft, the cooling wind passage is provided between the left and right cylinders, and the wind passage terminal end wall projects upward from the crankcase.

18. The air-cooled engine according to claim 13 , comprising:
a wind shielding plate, wherein
the wind shielding plate is provided in an inlet of the cooling wind passage, and the temperature sensor is arranged at a position to be hidden behind the wind shielding plate when seen from the front side in the direction parallel to the installation direction of the crankshaft.

19. The air-cooled engine according to claim 14 , comprising:
a wind shielding plate, wherein
the wind shielding plate is provided in an inlet of the cooling wind passage, and the temperature sensor is arranged at a position to be hidden behind the wind shielding plate when seen from the front side in the direction parallel to the installation direction of the crankshaft.

20. The air-cooled engine according to claim 15 , comprising:
a wind shielding plate, wherein
the wind shielding plate is provided in an inlet of the cooling wind passage, and the temperature sensor is arranged at a position to be hidden behind the wind shielding plate when seen from the front side in the direction parallel to the installation direction of the crankshaft.

Assignees

• Kubota Kk

Inventors

• Nakashima Eishin
• Kimoto Kiyoharu
• Takasaki Mineo
• Ohno Masaharu

Classifications

• G01K2205/00

  Application of thermometers in motors, e.g. of a vehicle · CPC title

• F01P1/02 Primary

  Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders · CPC title

• F02B77/085

  with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame · CPC title

• F02B75/22

  with cylinders in V, fan, or star arrangement · CPC title

• F01P11/08

  Arrangements of lubricant coolers (in lubrication apparatus F01M) · CPC title