Crank link mechanism for small two-stroke gasoline engine

Abstract

The invention relates to the technical field of engines, in particular to a crankshaft and connecting rod mechanism for a handheld small two-stroke gasoline engine. The crankshaft and connecting rod mechanism comprises a connecting rod and a crankshaft, wherein two crank arms are arranged on the crankshaft and are fixedly connected with each other through an eccentric middle spindle neck; the connecting rod is arranged on the middle spindle neck; a front spindle neck and a rear spindle neck are respectively arranged on outer side walls of the two crank arms; balancing weights are symmetrically arranged on the other sides, which are opposite to the middle spindle neck, of the two crank arms respectively; and counterweight and pressurization blocks are respectively arranged on the outer side walls of the two crank arms, and are fixedly connected with each other. The crankshaft and connecting rod mechanism for the handheld small two-stroke gasoline engine has the advantages that the power of the gasoline engine is increased, oil consumption is reduced, meanwhile, standard requirements of international safety regulation or emission certification are met, research and development costs of products are reduced, and comfort level is improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a crank connecting rod mechanism for a hand-held small two-stroke gasoline engine. Background technique [0002] In order to increase the engine power without increasing the weight and size of the two-stroke gasoline engine to meet the needs of customers in the professional tool market, most of the existing technical improvements in this industry are to increase the diameter of the cylinder and piston of the gasoline engine, so as to achieve an increase. The purpose of power displacement is to increase power. Such a technical solution is simple, requires low design technology and manufacturing process, and will not increase the weight, volume and cost of the gasoline engine, and is basically accepted by most markets at home and abroad. However, the disadvantages of this technical solution are also very obvious: 1. Increasing the power by increasing the engine displacement will i...

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Problems solved by technology

However, the disadvantages of this technical solution are also very obvious: 1. Increasing the power by increasing the engine displacement will inevitably increase the engine fuel consumption and exhaust emissions, making the product worse in terms of fuel economy and environmental protection ; 2. The cylinder displacement has been increased rashly, but the crank-link mechanism has not been optimized, which will lead to increased vibration when the engine is working, and poor product comfort; 3. Due to domestic and foreign regulations on gasoline engines, there are many Taking displacement as an important indicator, engines with increased displacement and increased power are likely to comply with the requirements of higher displacement standards. Most of the functions have to be re-verified, and many international safety regulations or emission certifications must be re-launched. The changing direction of the earth has increased the cost of product development

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