Technique for cooling for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10815864-B2
Application number	US-201816134533-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Sep 29, 2017
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

An internal combustion engine including a cooling liquid circuit, which is connected to a cylinder head and an engine block of the internal combustion engine and which includes a cooling liquid pump. The cooling liquid pump includes a drive shaft and is capable of conveying cooling liquid in the cooling liquid circuit. Further, the internal combustion engine includes a Visco clutch. The Visco clutch is arranged for the drive by the internal combustion engine. The Visco clutch includes a clutch fluid for torque transmission. At the output side, the Visco clutch is connected to the drive shaft of the cooling liquid pump. The drive shaft of the cooling liquid pump include at least one heat pipe. The heat pipe is in heat exchange with the clutch fluid as a heat source and the cooling liquid as a heat sink.

First claim

We claim:

1. An internal combustion engine, comprising:
a crankshaft
a cooling liquid circuit, which is connected or can be connected to a cylinder head and/or an engine block of the internal combustion engine and which comprises a cooling liquid pump which includes a drive shaft and which is constructed to convey cooling liquid in the cooling liquid circuit; and
a viscous clutch, which is arranged or can be arranged to be driven by the crankshaft, and which includes clutch fluid for torque transmission and which is connected at the output side to the drive shaft of the cooling liquid pump,
wherein the drive shaft of the cooling liquid pump includes at least one heat pipe which is or can be brought into heat exchange with the clutch fluid as a heat source and the cooling liquid as a heat sink.

2. The internal combustion engine according to claim 1 , wherein the internal combustion engine is operably connected to a motor vehicle.

3. The internal combustion engine according to claim 1 , wherein the viscous clutch includes plates around which the clutch fluid flows and which are connected to the drive shaft in a rotationally secure manner and via which the heat pipe is in heat exchange with the clutch fluid as a heat source.

4. The internal combustion engine according to claim 1 , wherein the cooling liquid pump includes an impeller around which the cooling liquid flows and which is connected to the drive shaft in a rotationally secure manner and via which the heat pipe is in heat ex-change with the cooling liquid as a heat sink.

5. The internal combustion engine according to claim 1 , wherein the cooling liquid circuit further includes a radiator and a thermostat.

6. The internal combustion engine according to claim 1 , wherein the heat pipe includes at least one which extends in the longitudinal direction of the drive shaft.

7. The internal combustion engine according to claim 6 , wherein the at least one capillary of the heat pipe is arranged coaxially relative to the drive shaft.

8. The internal combustion engine according to claim 6 , wherein the at least one capillary includes a medium, which is constructed to evaporate as a result of thermal contact with the heat source and to condense as a result of thermal contact with the heat sink.

9. The internal combustion engine according to claim 8 , wherein the heat pipe is a closed system which contains the medium.

10. The internal combustion engine according to claim 1 , wherein a thermal resistance of a heat line in the metal of the drive shaft is many times greater than a thermal resistance of a heat transport in the heat pipe.

11. The internal combustion engine according to claim 1 , further comprising a control unit which is constructed to control a degree of coupling of the viscous clutch in accordance with a temperature of the cooling liquid.

12. The internal combustion engine according to claim 1 , wherein the heat pipe is arranged coaxially in the drive shaft.

13. The internal combustion engine according to claim 1 , wherein a thermal capacity of the cooling liquid is many times greater than a thermal capacity of the clutch fluid.

14. A motor vehicle, comprising:
an internal combustion engine including,
a crankshaft
a cooling liquid circuit, which is connected or can be connected to a cylinder head and/or an engine block of the internal combustion engine and which comprises a cooling liquid pump which includes a drive shaft and which is constructed to convey cooling liquid in the cooling liquid circuit; and
a viscous clutch, which is arranged or can be arranged to be driven by the crankshaft, and which includes clutch fluid for torque transmission and which is connected at the output side to the drive shaft of the cooling liquid pump,
wherein the drive shaft of the cooling liquid pump includes at least one heat pipe which is or can be brought into heat exchange with the clutch fluid as a heat source and the cooling liquid as a heat sink.

15. The motor vehicle according to claim 14 , wherein the motor vehicle is a utility vehicle.

Assignees

• Man Truck & Bus Ag

Inventors

• Schydlo Alexander
• Martens Robert

Classifications

• F16D35/005

  with multiple lamellae · CPC title

• F01P7/164

  by varying pump speed · CPC title

• F01P7/162 Primary

  by cutting in and out of pumps · CPC title

• F01P5/12 Primary

  Pump-driving arrangements · CPC title

• F01P3/20

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title