Engine unit with lubricant cooling
First Claim
1. A differential gear of a vehicle driving axle lubricated by means of a liquid lubricant, having a lubricant collecting pipe as well as having a lubricant cooling system, comprising a heat pipe, with its heat-receiving part, that is circular in its cross section, projecting directly into the lubricant collecting space in an area of an especially high reflux current or turbulence of the lubricant in the collecting space;
- the heat-emitting part of the heat pipe, in the operational installation position of the differential gear, is geodetically higher than its heat-receiving part; and
the heat-emitting part of the heat pipe is formed in a plate-shaped manner, of two sheet-metal plates that are welded to one another so that they are hermetically tight, with the heat-emitting part being exposed to ambient air and being aligned in the driving direction of the vehicle, where the surface in the heat-emitting part of the heat pipe that can be used for the formation of the condensate is larger than the surface in the heat-receiving part that can be used for the evaporation.
1 Assignment
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Accused Products
Abstract
An engine unit adapted to be lubricated by a liquid lubricant with a lubricant reservoir as well as a lubricant cooling. The cooling takes place by way of at least one heat pipe, with the heat pipe having a heat absorbing portion adapted to be exposed to the lubricant and a heat transmitting portion adapted to be exposed to surrounding air. The engine unit may be an internal combustion engine, a gear system such as a change-speed transmission or differential transmission of a vehicle drive axle.
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Citations
4 Claims
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1. A differential gear of a vehicle driving axle lubricated by means of a liquid lubricant, having a lubricant collecting pipe as well as having a lubricant cooling system, comprising a heat pipe, with its heat-receiving part, that is circular in its cross section, projecting directly into the lubricant collecting space in an area of an especially high reflux current or turbulence of the lubricant in the collecting space;
- the heat-emitting part of the heat pipe, in the operational installation position of the differential gear, is geodetically higher than its heat-receiving part; and
the heat-emitting part of the heat pipe is formed in a plate-shaped manner, of two sheet-metal plates that are welded to one another so that they are hermetically tight, with the heat-emitting part being exposed to ambient air and being aligned in the driving direction of the vehicle, where the surface in the heat-emitting part of the heat pipe that can be used for the formation of the condensate is larger than the surface in the heat-receiving part that can be used for the evaporation. - View Dependent Claims (2, 3, 4)
- the heat-emitting part of the heat pipe, in the operational installation position of the differential gear, is geodetically higher than its heat-receiving part; and
Specification