Motorcycle engine

Abstract

The invention discloses a motorcycle engine, which comprises an engine box body arranged below an inclined beam of a frame, wherein the front end of the engine box body is obliquely provided with a gas cylinder body upward; the front end of the gas cylinder body is provided with a gas cylinder head; an arrangement space of a gas inlet system is respectively formed between the gas cylinder body and the inclined beam of the frame, as well as between the gas cylinder head and the inclined beam of the frame; the relative positions of the gas cylinder body, the gas cylinder head and the inclined beam of the frame are unchanged; the inclined angle of a center line of a cylinder sleeve in the gas cylinder body relative to the horizontal face is unchanged; the engine box body moves upward as a whole; that is, the center of a crank bearing hole in the engine box body is offset upward to the upper side of the center line of the cylinder sleeve in the gas cylinder body, so that the arrangement spaces of the gas inlet system formed between the gas cylinder body and the inclined beam of the frame, as well as between the gas cylinder head and the inclined beam of the frame, are unchanged; when the arrangement requirements of a gas inlet pipeline system are met, the ground clearance of the engine box body is increased; and therefore, the contradiction between the arrangement space of the gas inlet system in the prior art and the terrain clearance of the engine is solved, and various performance requirements on the driving of vehicles on non-paved roads such as roads in mountainous areas can be met well.

Description

technical field [0001] The invention relates to a motorcycle engine. Background technique [0002] With the acceleration of the country's urbanization process, the number of urban vehicles has expanded rapidly, and the number of cities that restrict motorcycles and prohibit motorcycles from passing through the country is also increasing. The main sales area of ​​motorcycles has shifted to the vast mountainous and rural areas. Most of the roads in these areas are non-paved roads, and there are rough mountain roads and poor country roads with potholes. Therefore, motorcycle engines are required to have a higher ground clearance to ensure good passing performance. Meet the use of various harsh road conditions. [0003] At the same time, for motorcycles used in mountainous areas and rural areas, users also require the engine to have the important characteristics of high torque output at medium and low speeds and low fuel consumption. In order to meet this requirement, it is nec...

AI Technical Summary

Problems solved by technology

In order to meet the above-mentioned layout requirements of the intake system pipeline, the engine must be moved downward relative to the vehicle frame to ensure that the intake system has enough space for layout, which will reduce the height of the engine from the ground and improve the trafficability of the vehicle. Reduced, cannot well meet the passability requirements in mountainous areas and rural areas

[0004] The center line of the cylinder liner in the cylinder body of a traditional engine passes through the center of the crankshaft bearing hole of the engine case. The above two layout requirements for the traditional engine have obvious contradictions, and it is difficult to ensure

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