Title of Invention

AN OIL PUMP AND CAM CHAIN MOUNTING ARRANGEMENT FOR FOUR STROKE ENGINE OF A SCOOTER TYPE MOTOR VEHICLE

Abstract

An oil pump and cam chain mounting arrangement for four stroke engine of a scooter type motor vehicle comprising an oil pump driven by a gear mounted on the crankshaft; a cam chain for driving the cam shaft of the engine; a sprocket mounted on the crankshaft for driving the cam chain, characterized in that the cam chain I sprocket and the gear are mounted one after the other on one and the same side of the crankshaft; a cavity is provided on the crankcase for mounting the oil pump therein~ a detachable lid for covering the cavity, said lid being provided with an inspection window for viewing the cam chain and oil pump trom outside the crankcase, said lid being fastened to the crankcase and also provided with an oil seal tor preventing leakage of oil from the cavity .

Full Text

This invention relates to an oil pump and cam chain mounting arrangement for four stroke engine of a scooter type motor vehicle. In the lubrication system for a stepless transmission scooter type four stroke engine the oil pump is driven by a gear mounted on the crankshaft. .In the known arrangement the oil pump is fitted on any one of the crankcases above the oil sump. The camshaft of the engine is driven by a chain, the sprocket of which is mounted on crankshaft on one side or the other of the engine crankshaft. The main disadvantage of the above mentioned known assembly of the oil pump and the cam chain is that the engine crankcases have to be dismantled separately for inspecting the cam chain and the oil pump to keep a check on wear, abnormality or damage. This invention proposes a caecilian and oil pump mounting arrangement, which eliminates the above drawback of the known arrangement. A novel arrangement of oil pump and cam chain mounting arrangement is provided, ensuring easy inspection of the oil pump and cam chain, from outside, without dismantling . the crankcases. Consequently, the new arrangement saves time and labour tor service personnel. The oil pump and cam chain mounting arrangement, for the four stroke engine of a scooter type motor vehicle, according to this invention, comprises an oil pump driven by a gear mounted on the crankshaft; a cam chain for driving the cam shaft of the engine; a sprocket mounted on the crankshaft for driving the cam chain, characterized in that the cam chain sprocket and the gear are mounted one after the other on one and the same side of the crankshaft; a cavity" is provided on the crankcase for mounting the oil pump therein; a detachable lid for covering the cavity, said lid being provided with an inspection window for viewing the cam chain and oil pump from outside the crankcase, said lid being fastened to the crankcase and also provided with an oil seal for preventing leakage of oil from the cavity. This invention will now be described with reference to the accompanying drawings which illustrate, by way of example, and not by way of limitation, one of possible embodiments of this invention. Fig.l illustrating a sectional view of the engine assembly from top Fig.2 illustrating another view of the engine assembly. Fig 3 illustrating an exploded view of the engine assembly. The embodiment illustrated will be seen to comprise an oil pump P driven by a gear G mounted on the crankshaft D. A cam chain C drives the camshaft T of the engine. A sprocket S (cam chain sprocket) is mounted on the crankshaft D for driving the cam chain C. What is noteworthy is that The cam chain sprocket S and the gear G are mounted, one after the other, on one and the same side of the crankshaft A cavity E is provided on the crankcase for mounting the oil pump P therein and a detachable lid L covers the E, said lid being provided with an inspection window for viewing the cam chain and oil pump from outside the crankcase. The lid is fastened to the crankcase and is provided with an oil seal K for preventing leakage of oil from the cavity E. The window W will be made of a thick transparent glass pane or a transparent durable sheet of plastic for easy viewing of the interior/crankcase where the oil pump and cam chain are located. The need for dismantling the crankcase during maintenance operations is thus obviated. The terms and expressions in the specification are of description and not of limitation, as these do not exclude any equivalents of the features illustrated and described, but it is understood the various other embodiments of the invention proposed herein are possible without departing from its scope and ambit We Claim: 1. All oil pump and cam chain mounting arrangement for four stroke engine of a scooter motor vehicle comprising an oil pump driven by a gear mounted on the crankshaft; a cam chain torn driving the cam shaft of the engine; a sprocket mounted on the crankshaft for driving the cam chain, characterized in that the cam chain sprocket and the gear are mounted one after the other on one and the same side of the crankshaft; a cavity is provided on the crankcase for mounting the oil pump ligroin; a detachable lid for covering the cavity, said lid being provided with an inspection window for viewing the cam chain and oil pump from outside the crankcase, said lid being fastened to the crankcase and also provided with an oil seal for preventing leakage of oil from the cavity. 2. An oil pump and cam chain mounting arrangement as claimed in Claim 1 wherein the window is made of a durable transparent material, such as, thick glass or plastic. 3. An oil pump and cam chain mounting arrangement for the four stroke engine of a scooter type motor vehicle substantially as herein described and illustrated with reference to the accompanying drawings.

Documents:

0382-mas-2003 abstract duplicate.pdf

0382-mas-2003 abstract.pdf

0382-mas-2003 claims duplicate.pdf

0382-mas-2003 claims.pdf

0382-mas-2003 correspondence others.pdf

0382-mas-2003 correspondence po.pdf

0382-mas-2003 description (complete) duplicate.pdf

0382-mas-2003 description (complete).pdf

0382-mas-2003 drawings.pdf

0382-mas-2003 form-1.pdf

0382-mas-2003 form-19.pdf

0382-mas-2003 form-26.pdf