Fluid reaction surfaces (i.e. – impellers) – Support mounting – carrier or fairing structure
Reexamination Certificate
1999-09-28
2001-02-20
Look, Edward K. (Department: 3746)
Fluid reaction surfaces (i.e., impellers)
Support mounting, carrier or fairing structure
C415S216100
Reexamination Certificate
active
06190134
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an arrangement for attaching the hub of a fan to the shaft of a motor.
2. Description of the Prior Art
In some prior art air cooling systems used in motor vehicles employing a fan, for example, for cooling a radiator or the coils of an air conditioner, spring clips on one side of the fan have been used for holding the fan to the shaft of a motor and a drive pin coupled to the shaft and fan has been used for transmitting torque from the shaft to the fan. This arrangement sometimes has resulted in the fan pivoting or wobbling on the shaft as it rotates.
In another prior system, the fan included a hub with outer bosses and a torque washer with apertures for receiving the bosses, was attached to the end of the shaft with a screw or bolt. The same type of drive pin connection was used which also resulted in the fan pivoting or wobbling on the shaft during rotation. The screw also tended to back off or loosen over a period of time. The central hole through the fan hub for receiving the shaft had to be very precise such that a press fit occurred in order to minimize the wobble. This still resulted in a 5 percent rejection of the fans in normal production.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a unique and more effective means for attaching a fan to the shaft of a motor.
The invention employs a retaining ring and a thrust washer located around the shaft on the inner side of the hub of the fan and a torque washer located on the outer side of the hub with the end of the shaft extending through a central aperture of the torque washer. The retaining ring supports the thrust washer and the thrust washer engages and supports the hub of the fan. The aperture of the torque washer and the side of the shaft at the end thereof have means which prevents rotation between the torque washer and the shaft. A threaded means with a head is screwed through the aperture of the torque washer into a threaded aperture formed in the end of the shaft, with the head engaging the torque washer. Bosses are formed on the outer side of the hub which fit in apertures formed through the torque washer radially outward of its central aperture to transfer torque to the hub radially outward. The head of the threaded means has serrations for engagement with the torque washer to prevent the threaded means from being unscrewed from the shaft during rotation.
REFERENCES:
patent: 4147470 (1979-04-01), Brooks et al.
patent: 4245957 (1981-01-01), Savage et al.
patent: 4941805 (1990-07-01), Matthews
patent: 5207561 (1993-05-01), Godichon
patent: 5984632 (1999-11-01), Lee et al.
patent: 6039536 (2000-03-01), Van De Venne et al.
Look Edward K.
McAleenan James M
Molded Products Company
Zobal Arthur F
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