CN2729325Y - Four-stroke petrol engine - Google Patents

Abstract

The utility model discloses a four-stroke petrol engine which is to solve the problems that the existing four-stroke gasoline engine needs special fluid oil, lubricating components, lubricating passage ways for lubricating moving components, the complete engine has a complicate structure with great volume and weight, and consumes more lubricating oil, and the existing four-stroke gasoline engine is easy to get faults and is not applicable to the small-sized portable hand-held machines. For solving above problems, the petrol engine has the major technique that the utility model comprises a carburetor, a cylinder, a box body and a crankshaft chamber composed of the cylinder and the box body; a gas mixture by-pass channel for the carburetor is added to the carburetor; a by-pass channel is arranged between the gas mixture by-pass channel for the carburetor and the crankshaft chamber; the cylinder is provided with a cylinder oil return channel and a gas connection. The petrol engine does not need special lubricating components and lubricating passage ways to lubricate the moving components, thus, the petrol engine reduces the volume of the complete engine, simplifies the structure of the complete engine, lightens the mass of the complete engine, and reduces the fault rate of the complete engine. Specially, the petrol engine applicable to the small-sized portable hand-held machines in place where the engine is asked to work at any angle flexibly.

Description

A kind of four-stroke gasoline engine

Technical field the utility model relates to the petrol engine field, particularly a kind of four-stroke gasoline engine.

The existing four-stroke gasoline engine of background technique, what the process Carburetor entered the firing chamber is pure gas-air mixture body; Provide lubricant oil that moving element is lubricated by special lubricating component.Be characterized in: need be provided with lubricant oil container and lubricating oil path, complex structure, volume is big, weight is big; Petrol engine can not be realized arbitrarily angled rotation, because of weight is not suitable for particularly small portable hand-held machine of some small-sized machines greatly, needs the occasion of motor in arbitrarily angled flexible work as chain saw, brush cutter etc.; Lubricating oil path breaks down easily, lubricant oil is in use particularly apt to deteriorate under the high temperature, thereby greasy property descends and makes petrol engine moving element wearing and tearing aggravation, strengthen the consumption of lubricant oil, white cigarette appears emitting, influence the moving element life-span, in addition cause petrol engine catastrophe failure and scrap, to machinery and personal security cause danger.

The summary of the invention the technical problems to be solved in the utility model is, existing four-stroke gasoline engine needs by special lubricating component and lubricating oil path moving element to be lubricated, the complete machine structure complexity, volume is big, weight is big, can not realize arbitrarily angled rotation, break down easily, be not suitable for the small portable hand-held machine.

The technological scheme of the utility model technical solution problem is as follows:

The utility model comprises Carburetor, cylinder body, casing and the crankshaft room that is made up of cylinder body, casing etc., it is characterized in that: have additional Carburetor mixed gas bypass channel on the Carburetor, between Carburetor mixed gas bypass channel and crankshaft room, be provided with bypass channel, on cylinder body, be provided with the cylinder body drainback passage and be communicated with intake duct.

Cylinder body of the present utility model is provided with the bypass channel hole, and bypass channel is communicated with crankshaft room through the bypass channel hole.

Carburetor mixed gas passage of the present utility model is one.

The utility model is owing to have additional the Carburetor mixed gas passage on Carburetor, fuel oil is the miscella that gasoline and lubricant oil are formed in proportion, miscella and air form mixed gas in Carburetor, the bypass channel hole of mixed gas on bypass channel, cylinder body enters crankshaft room, enter gear chamber then, enter rocker arm chamber again, enter the firing chamber through cylinder body drainback passage, intake duct at last, thus moving elements such as lubricated bent axle, connecting rod, bearing, piston, wrist pin, gear, lower shake-changing arm, rocking arm combination, tappet.Need not be lubricated moving element, reduce the volume of crankshaft room effectively, simplify complete machine structure, alleviated the complete machine quality by special lubricating component and lubricating oil path; Because the mixed gas supply changes with the variation of petrol engine operating mode, under the condition of particularly operating at full capacity for a long time, guaranteed the good lubrication of each moving element, avoided emitting white cigarette phenomenon, alleviate the wearing and tearing of petrol engine moving element, improved the moving element life-span, reduced the generation of complete machine fault.Because of no excessive lubricant oil, complete machine light weight in the petrol engine body, the gasoline function realizes arbitrarily angled rotation, is specially adapted to the small portable hand-held machine, needs the occasion of motor in arbitrarily angled flexible work as chain saw, brush cutter etc.

Description of drawings

Fig. 1 is a schematic representation of the present utility model;

Fig. 2 is that the A of Fig. 1 is to view;

Among the figure: 1-Carburetor, 2-Carburetor mixed gas bypass channel, 3-bypass channel, 4-cylinder body, 5-casing, 6-crankshaft room, 7-bearing, 8-gear, 9-cam wheel, 10-lower shake-changing arm, 11-tappet, 12-rocker arm chamber, the combination of 13-rocking arm, 14-cylinder body drainback passage, 15-intake duct, 16-intake valve, 17-bypass channel hole.

Embodiment

With reference to Fig. 1, Fig. 2, during petrol engine work, fuel oil is the miscella that gasoline and lubricant oil are formed by a certain percentage, and miscella and air form mixed gas in Carburetor 1.Most of mixed gas enters the firing chamber through intake duct 15 when intake valve 16 is opened, the Carburetor mixed gas bypass channel 2 that the fraction mixed gas is set up on Carburetor 1, bypass channel 3 enters crankshaft room 6 through bypass channel hole 17, thereby lubricated crankshaft-link rod, bearing 7, moving elements such as piston, enter gear chamber through the gap of bearing 7 Internal and external cycles then, thereby the gear 8 of lubricated distribution device, cam wheel 9, lower shake-changing arm 10, tappet 11 lower end surfaces, enter rocker arm chamber 12 through the gap of cylinder body 4 and tappet 11 again, thereby lubricated rocking arm combination 13, tappet 11 upper-end surfaces, intake valve 16 and exhaust valve shaft, remaining mixed gas enters intake duct 15 through cylinder body drainback passage 14, enters the combustion chambers burn acting at last when intake valve 16 is opened.

Claims (3)

1 one kinds of four-stroke gasoline engines, comprise Carburetor (1), cylinder body (4), casing (5) and the crankshaft room (6) that forms by cylinder body (4), casing (5) etc., it is characterized in that: have additional Carburetor mixed gas bypass channel (2) on the Carburetor (1), between Carburetor mixed gas bypass channel (2) and crankshaft room (6), be provided with bypass channel (3), on cylinder body (4), be provided with cylinder body drainback passage (14) and be communicated with intake duct 15.

2 four-stroke gasoline engines according to claim 1 is characterized in that: described cylinder body (4) is provided with bypass channel hole (17), and bypass channel (3) is communicated with crankshaft room (6) through bypass channel hole (17).

3 four-stroke gasoline engines according to claim 1 and 2 is characterized in that: Carburetor mixed gas bypass channel (2) is one.

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