Liquid-cooled motor

Abstract

A liquid-cooled motor which is cooled highly uniformly and in which a loss of the pressure of a cooling liquid is suppressed to a smallest possible level.  Connecting flow paths (76)(76a-76l) are provided between entrance-side and exit-side annular flow paths (72, 74) so as to extend in the axis direction of a liquid-cooled motor (70), and a cooling liquid is caused to flow parallelly from the entrance-side annular flow path (72) to the exit-side annular flow path (74).  An entrance-side dam section (82) for damming the flow of the cooling liquid flowing in the entrance-side annular flow path (72) is provided to the entrance-side annular flow path (72), and an exit-side dam section (84) for damming the flow of the cooling liquid flowing in the exit-side annular flow path (74) is provided to the exit-side annular flow path (74).  The entrance-side and exit-side dam sections (82, 84) are arranged in such a manner that the length of the flow path leading to an outflow opening (80) from that point on the exit-side annular flow path (74) side with which the connecting flow path (76a) located close to an inflow opening (78) in the entrance-side annular flow path (72) merges is greater than the distance from the inflow opening (78) in the entrance-side annular flow path (72) to the connecting flow path (76a).

Description

technical field [0001] The invention relates to a liquid-cooled motor with a housing structure that can be cooled by a cooling liquid. Background technique [0002] Patent Document 1 discloses a liquid-cooled motor having a housing structure that can be cooled by a coolant. [0003] The first cooling structure of the liquid-cooled motor disclosed in this Patent Document 1 includes: an inlet-side annular flow passage provided with an inflow port through which the cooling liquid flows; and an outlet-side annular flow passage provided with an outflow port through which the cooling liquid flows out. , wherein the inlet-side annular flow channel and the outlet-side annular flow channel are connected by a plurality of connecting flow channels arranged along the axial direction of the liquid-cooled motor. [0004] On the other hand, in the same patent document 1, the 2nd cooling structure different from the said 1st cooling structure is disclosed. In this second cooling structure...

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Problems solved by technology

[0006] However, the above-mentioned first cooling structure has the following problem: the cooling fluid between the inlet and the outlet moves very freely, so it tends to easily pass through the shortest flow path from the inlet to the outlet, and sometimes the uniformity of cooling cannot be maintained. In order to make the coolant spread throughout the whole, it is necessary to ensure the corresponding pump capacity

[0007] In addition, in the above-mentioned second cooling structure, the cooling liquid goes back and forth several times while changing direction by 180 degrees between the inlet-side annular flow channel and the outlet-side annular flow channel, so that it flows out from the outlet after passing through all the connecting channels. Therefore, there is a problem that the pressure loss (pressure loss) of the coolant increases

Therefore, in a cooling system that must use the same cooling flow path to cool the motor and the drive controller for driving the motor, such as driving devices such as hybrid construction machines, it is difficult to realize the structure as a whole of the cooling system, thereby generate such fundamental problems that it is practically impossible to adopt

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