Drain Bolt Mounting Structure

a technology of mounting structure and bolt, which is applied in the direction of lubricant filling/draining, shaft and bearing, lubrication element, etc., can solve the problems of bolt (b>12/b>) not being easily and efficiently mounted, and having a very low standard electrode potential and high electrical corrosion risk, so as to achieve a highly sealed state and facilitate and efficiently moun

US20110155507A1Inactive Publication Date: 2011-06-30KAWASAKI HEAVY IND LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2011-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

A drain bolt mounting structure comprises a bottomed hole formed on an outer surface of an oil pan to extend continuously with a drain hole of the oil pan, a female thread formed on an inner peripheral surface of the drain hole; a drain bolt including a shaft portion having a male thread threadingly engageable with the female thread of the drain hole and a head portion formed at one end portion of the shaft portion; a press-in member formed of a second metal containing aluminum which has a higher standard electrode potential than a first metal forming the oil pan, the press-in member being configured to be pressed into the bottomed hole; and a crushing member configured to be crushed between the press-in member and the head portion of the drain bolt.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONThe present application claims priority to Japanese Patent Application No. 2009-297894 filed on Dec. 28, 2009 which is hereby incorporated by reference in its entirety for all purposes.BACKGROUND ART1. Field of the InventionThe present invention relates to a drain bolt mounting structure for sealably closing a drain hole provided in an oil pan formed of metal containing magnesium, in a fluid-tight state.2. Description of the Related ArtAn engine mounted in a vehicle such as a motorcycle includes a cylinder head, a cylinder block, a crankcase, an oil pan, etc. The crankcase accommodates a crankshaft and an oil pump. The oil pan is provided with a drain hole at a bottom portion thereof. The drain hole is sealably closed by a drain bolt or the like in a fluid-tight state. Upon the engine running, the oil pump is actuated by the rotation of the crankshaft, and oil reserved in the oil pan is pumped by the oil pump to be fed to driving members and com...

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Embodiment Construction

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The stated directions are referenced from the perspective of a driver straddling a motorcycle, unless otherwise explicitly noted.

[Construction of Motorcycle]

FIG. 1 is a left side view showing a construction of an entire motorcycle 14 including an oil pan 12 having a drain bolt mounting structure 10 according to the embodiment.

Referring now to FIG. 1, the motorcycle 14 includes a main frame member 16, a head pipe 18 provided at the front portion of the main frame member 16 and a pair of right and left pivot frame members 20 provided at the rear portion of the main frame member 16. A steering shaft (not shown) is rotatably inserted into the head pipe 18. A front fork 22 and a steering handle 24 are attached to the steering shaft. A pair of right and left swing arms 26 is attached to the pivot frame members 20, respectively. A front wheel 28 is mounted to the lower end portion of the f...