CN-224228927-U - Fan coupling

Abstract

The utility model provides a fan coupling capable of suppressing abrasion without damaging the assembling workability of a blocking member. A fan coupling (1) is provided with a clutch disc (3) that is integrally rotatably fixed to a drive shaft (2), a clutch housing (4) that fixes a fan, a labyrinth passage (12) that is provided between the outer surface of the clutch housing and the surface facing the outer surface of the clutch disc, a supply passage (13) that supplies a working fluid from a torque transmission chamber (11) to the labyrinth passage, a return passage (14) that guides the working fluid discharged radially outward from the labyrinth passage to a reservoir chamber (10), and a blocking member (15) that guides the working fluid discharged from the labyrinth passage to the return passage. A groove (44) for installing the blocking member is provided in the clutch housing, and a spacer (16) for filling the installation gap of the blocking member is inserted into the groove.

Inventors

• HIKICHI Yuto

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20250515

Priority Date

20240523

Claims (1)

1. 1. A fan coupling, comprising: A clutch disc which is integrally rotatably fixed to the drive shaft and is disposed in the torque transmission chamber; a clutch housing for fixing the fan, wherein a working fluid storage chamber partitioned by a partition plate and the torque transmission chamber are provided inside the clutch housing; A labyrinth passage provided between an outer surface of the clutch housing and an opposite surface of an outer side surface of the clutch disc; a communication hole provided in the partition plate and communicating the reservoir chamber with the torque transmission chamber; a valve element for opening and closing the communication hole; A supply path provided between an inner surface of the clutch disc and an opposite surface of an inner surface of the clutch housing, for supplying a working fluid from the torque transmission chamber to the labyrinth path; a return passage for guiding the working fluid discharged radially outward from the labyrinth passage due to the rotational centrifugal force of the clutch disk to the reservoir chamber, and A blocking member for blocking the working fluid discharged radially outward from the labyrinth passage to prevent the working fluid from flowing to the supply passage and guiding the working fluid to the return passage, A groove for accommodating the blocking member is provided in the clutch housing, A spacer for filling the insertion gap of the blocking member is inserted into the groove.

Description

Fan coupling Technical Field The present utility model relates to a fan coupling. Background The present inventors have proposed, for example, patent document 1. Patent document 1 describes "a fan coupling device 100 in which a fan is rotated and stopped by controlling energization and cutoff of energization to an electromagnet 13", the fan coupling device comprising a labyrinth portion 10 provided between an outer surface of a clutch housing 4 and an opposing surface of an outer surface of a clutch disc 3, a working fluid supply path 11 for supplying a working fluid from a torque transmission chamber 9 to the labyrinth portion 10, and a working fluid discharge path 12 for guiding the working fluid discharged radially outward from the labyrinth portion 10 to a reservoir chamber 8 ". Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2021-134820 Disclosure of utility model Problems to be solved by the utility model The present inventors considered a structure in which a blocking member for blocking the working fluid discharged from the labyrinth 10 to prevent the working fluid from flowing into the working fluid supply path 11 and guiding the working fluid to the working fluid discharge path 12 is incorporated into the clutch housing 4 in the above-described patent document 1, but in the case of this structure, it is considered that there is room for improvement such as the operation control of the fan being disabled if the blocking member wears in a short time and the blocking effect of the working fluid is reduced. In view of the above, an object of the present utility model is to provide a fan coupling capable of suppressing wear without impairing the workability of mounting a second valve element. Means for solving the problems The fan coupling is characterized by comprising a clutch disc which is integrally rotatably fixed to a drive shaft and is arranged in a torque transmission chamber, a clutch housing which fixes a fan and is internally provided with a storage chamber for working fluid and the torque transmission chamber, which are partitioned by a partition plate, a labyrinth passage which is provided between the outer surface of the clutch housing and the surface facing the outer surface of the clutch disc, a communication hole which is provided in the partition plate and communicates the storage chamber with the torque transmission chamber, a valve body for opening and closing the communication hole, a supply passage which is provided between the inner surface of the clutch disc and the surface facing the inner surface of the clutch housing to supply working fluid from the torque transmission chamber to the labyrinth passage, a return passage which guides working fluid discharged radially outward from the labyrinth passage to the storage chamber due to the rotational centrifugal force of the clutch disc, and a blocking member which blocks working fluid discharged radially outward from the labyrinth passage to prevent the flow to the supply passage, and a blocking member which is embedded in the clutch housing and has a blocking groove which is provided in the partition groove. According to this structure, the spacer and the blocking member are respectively fitted into the groove during the assembly of the fan coupling, and the blocking member is held in the groove without rattling. In this way, the insertion workability of the blocking member is improved, and the blocking member does not shake in the groove, so that the blocking member can be prevented from being worn by collision with the opening edge of the groove. As a result, the reduction of the original function of the blocking member, that is, the blocking effect of the working fluid can be avoided for a long period of time, and thus the operation of the fan can be controlled stably for a long period of time. Effects of the utility model According to the present utility model, it is possible to provide a fan coupling capable of suppressing wear without impairing the workability of mounting a blocking member. Drawings Fig. 1 is a cross-sectional view showing an embodiment of a fan coupling according to the present utility model. Fig. 2 is a view showing the periphery of the blocking member of the fan coupling. Detailed Description Hereinafter, preferred embodiments for carrying out the present utility model will be described in detail with reference to the accompanying drawings. Fig. 1 and 2 show an embodiment of the present utility model. The illustrated fan coupling 1 includes a drive shaft 2, a clutch disc 3, a clutch housing 4, a partition plate 5, an electromagnet 6, a valve body 7, an attraction plate 8, a control unit 9, and the like. The drive shaft 2 is rotationally driven by an internal combustion engine, not shown. A clutch disc 3 is fixed to the front end portion of the drive shaft 2. The clutch disc 3 is fixed to the front end in the central axis direction of the drive shaft 2 in