Motorcycle engine crankcase and engine

Abstract

The invention discloses a motorcycle engine crankcase. The motorcycle engine crankcase comprises a crankcase body, a lubricating oil return opening is formed in the position, close to a cylinder body, of the inner lateral wall of the crankcase body, and a lubricating oil pump oil inlet is formed in the side, close to the cylinder body, of the bottom of the crankcase body. The motorcycle engine crankcase is characterized in that a box body strengthening transverse bar is arranged in the crankcase body and is located below the lubricating oil return opening, the interior of the crankcase body is divided through the box body strengthening transverse bar into upper space and lower space, and an oil via opening is formed in the side, far away form the lubricating oil return opening, of the box body strengthening transverse bar. In the engine running process, the engine oil backflow speed is decreased, heat of the cylinder body and a cylinder head is effectively brought away, and the overall engine performance is improved; as the engine oil backflow speed is decreased, impurities deposited at the bottom of a box body cannot be brought away, abrasion of parts of an engine is reduced, and the reliability of the engine is improved. The lubricating oil pump oil inlet of the box body is optimized, the oil pumping capacity cannot be reduced after the oil level is inclined, the overall engine cooling effect is improved, and the reliability of the engine is further improved.

Description

technical field [0001] The invention relates to a motorcycle engine crankcase and an engine, belonging to the field of motorcycle engines. Background technique [0002] The engine crankcase of the existing three-wheeled motorcycle with a large oil pan is a structure without an oil sump (see the applicant's prior application, its authorized announcement number is CN 203175700 U, and the name is "engine crankcase and its engine" ). The disadvantages of the existing technology are as follows: (1) During the operation of the engine, the oil recirculation speed is fast, which cannot effectively remove the heat from the cylinder block and cylinder head, resulting in a high heat load of the whole machine and a decrease in performance. (2) The oil backflow speed is fast, taking away the impurities deposited at the bottom of the tank, aggravating the wear of engine parts and reducing the reliability of the engine. (3) The oil inlet of the oil pump of the original box body is rela...

AI Technical Summary

Problems solved by technology

The disadvantages of the existing technology are as follows: (1) During the operation of the engine, the oil backflow speed is fast, which cannot effectively take away the heat of the cylinder block and cylinder head, resulting in a high heat load of the whole machine and a decline in performance

(2) The oil backflow speed is fast, taking away the impurities deposited at the bottom of the tank, aggravating the wear of engine parts and reducing the reliability of the engine

(3) The oil inlet of the original box oil pump is relatively high, because the oil pumping capacity decreases after the oil surface tilts, the whole machine cannot be effectively cooled, and the reliability of the engine is reduced

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