Pumps – Motor driven – Including means for facilitating assembly or disassembly of...
Reexamination Certificate
2002-01-04
2004-01-27
Yu, Justine R. (Department: 3746)
Pumps
Motor driven
Including means for facilitating assembly or disassembly of...
C417S423150, C123S041490, C165S121000, C165S122000
Reexamination Certificate
active
06682319
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor fan unit attachment structure for attaching a motor fan unit to a radiator, and to a radiator assembly fitted with a motor fan unit.
2. Related Art
An attachment structure for attaching a motor fan unit to a vehicle-mounted radiator is known from the disclosure of Japanese Laid-Open Patent Publication No. H 7-61246. In this attachment structure a plug is provided on a lower section of a motor fan unit for connecting to a radiator. This plug is inserted into an attachment section at the bottom of the radiator. The upperpart of the motor fan unit is connected to an upper part of the radiator using bolts. The plug may have a wedge shape with a wide edge at the upper end, and also may be a pin structure for inserting a pin of fixed thickness into a hole.
SUMMARY OF THE INVENTION
After attaching a motor fan unit to a radiator, the radiator is filled with water after vacuuming at an assembly plant. When the inside of the radiator is vacuumed out, the radiator is shortened in the vertical direction of the mounted state. For this reason a radiator plug of the motor fan unit is formed so as to have clearance in the vertical direction. With this type of structure, above described clearance is filled when the inside of the radiator is vacuumed out. After that, since the radiator returns to its vertical dimensions if irrigation of the radiator is carried out, the above-described clearance is generated. If the plug is wedge shaped, a plug of the motor fan rises up with respect to an attachment section of a wedge shaped hole in the radiator. This section therefore rattles with vibration of the vehicle, causing strange noises. The rattling also abrades the plug, and there is a problem that fixing sections on the upper part of the radiator are prone to being subjected to unnatural loads.
On the other hand, in the case of a perpendicular plug structure, such as the pin structure, there is no rattling in the horizontal direction, namely in the front to rear direction of the vehicle, unlike the wedge shaped plug. However, in order to ensure operability at the time of assembly, it is necessary to reduce the size of the fan shroud in the vertical direction (the vertical direction of the vehicle) by the extent of an insertion stroke for insertion perpendicular to the plug. As a result, the surface area of the radiator core that is covered by the fan shroud becomes small, and there is a problem that the cooling efficiency of the radiator is deteriorated.
The object of the present invention is to provide a motor fan unit attachment structure and radiator assembly having a motor fan unit that can prevent rattling of the motor fan unit without having a detrimental effect on the ease of assembly or cooling efficiency.
A motor fan unit attachment structure according to the present invention comprises upper attachment sections provided on respective upper parts of a radiator and a motor fan unit which is attached to the radiator at a downstream side of air flow through the radiator, and fastened together using fastening members, and lower attachment sections that include an inserted section provided on a lower part of the radiator and an insertion section provided on a lower part of the motor fan unit for inserting into the inserted section, furthermore, upstream side contact sections for bringing the inserted section and the insertion section into contact with each other, are provided respectively at upstream sides of air flows of the inserted section and the insertion section, and downstream side contact sections for bringing the inserted section and the insertion section into contact with each other, are provided respectively at downstream sides of air flows of the inserted section and the insertion section, so as to regulate movement of the insertion section and the inserted section to the down stream side and the upstream side of the air flow through the radiator, and so as to enable movement of the insertion section and the inserted section in a vertical direction.
A motor fan unit attachment structure according to the prevent invention comprises upper attachment sections provided on respective upper parts of a radiator and a motor fan unit attached to the radiator at a downstream side of air flow through the radiator, and fastened together using fastening members, and lower attachment sections that include an inserted section provided on a lower part of the radiator and an insertion section provided on a lower part of the motor fan unit for inserting into the inserted section, furthermore, the inserted section is a wedge shaped hole or indentation that narrows towards a lower end of the inserted section and is provided with an inclined surface formed at a downstream side of air flow through the radiator and a perpendicular surface formed at a position opposite to the inclined surface, and the insertion section is provided with a first contact section formed so as to extend in a perpendicular direction, that contacts the perpendicular surface, a second contact section that contacts a lower end of the inclined surface and extends by a specified length in the perpendicular direction beyond said lower end of the inclined surface and a third contact section formed opposite to the first contact section, capable of contacting the inclined surface of the inserted section.
A motor fan unit attachment structure according to the present invention comprises upper attachment sections provided on respective upper parts of a radiator and a motor fan unit attached to the radiator at a downstream side of air flow through the radiator and fastened together using fastening members, and lower attachment sections that includes an inserted section provided on a lower part of the radiator and insertion section provided on a lower part of the motor fan unit for inserting into the inserted section, furthermore, the inserted section is a wedge shaped hole or indentation that narrows towards a lower end of the inserted section and is provided with an inclined surface formed at a downstream side of air flow through the radiator and a perpendicular surface formed at a position opposite to the inclined surface, and the insertion section is provided with a first contact section formed so as to extend in a perpendicular direction, that contacts the perpendicular surface, a second contact section that contacts a lower end of the inclined surface and extends by a specified length in the perpendicular direction beyond the lower end of the inclined surface, a third contact section formed opposite to the first contact section and enabling contact with the inclined surface, and a sliding surface formed between a lower end of the first contact section and a lower end of the second contact section so that the insertion section moves along the perpendicular surface of the inserted section when the insertion section is inserted into the inserted section.
In a radiator assembly fitted with a motor fan unit according to the present invention, the radiator and the motor fan unit are integrated using a motor fan unit attachment structure of any one of claim 1 to claim 8.
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patent: 42 44 037 (1994-06-01), None
patent: 2 713 754 (1995-06-01), None
patent: 2 785 379 (2000-05-01), None
patent: 7-61246 (1995-03-01), None
McDermott & Will & Emery
Nissan Motor Co,. Ltd.
Rodriguez William H.
Yu Justine R.
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