RU217995U1 - Device for regulating the flow rate of the air-fuel mixture and scavenging air for a two-stroke internal combustion engine - Google Patents

Abstract

The utility model relates to the field of reciprocating two-stroke internal combustion engines, in particular to a device for supplying a fuel-air mixture and scavenging air in the engine intake duct. The essence of the utility model lies in the fact that the proposed device is additionally equipped with a damper in the inlet to control the flow rate of the air-fuel mixture and purge air, the damper is connected by a damper rod and a rocker arm with a hinged support with a rod connected to a return spring and a regulator washer, which is driven at an equal distance of weights of the centrifugal regulator from the shaft, depending on the frequency of its rotation. The use of such a device makes it possible to achieve the optimal speed and reduce hydraulic losses in the inlet of the inlet channel at various engine operating modes. 2 ill.

Description

The utility model relates to the field of reciprocating two-stroke internal combustion engines, in particular to a device for supplying a fuel-air mixture and scavenging air in the engine intake duct.

An air supply device for a two-stroke internal combustion engine is known, comprising an air cleaner having an air outlet and a baffle that divides the air outlet into a first hole and a second hole; and a carburetor comprising a passage and at least a throttle valve disposed in the passage, the throttle valve essentially separating the passage into an air portion and a mixture portion, the first opening being in a position corresponding to the air portion and the second opening being in the position corresponding to the mixture part, and the flow area of the first hole is different from the flow area of the second hole. (Patent RU 2545178 C2, IPC F02M 19/08, Published: 03/27/2015 Bull. No. 9). This device is taken as a prototype.

The disadvantage of the prototype is the inability to control the speed of the scavenging air in the inlet to improve the process of purging the cylinder in various engine operating modes. At low engine speeds, a small amount of air-fuel mixture enters the cylinder through the inlet at a low speed, which negatively affects the process of purge and removal of exhaust gases from the volume of the combustion chamber.

The objective of the utility model is to achieve optimal speed and reduce hydraulic losses in the inlet by installing a damper in it to control the flow of the air-fuel mixture and purge air. In the open state of the inlet damper, the throughput decreases and, as a result, the inlet flow speed increases, which, with a loop purge scheme, improves the process of cleaning the cylinder from exhaust gases.

The problem is solved due to the fact that in the device for regulating the flow rate of the air-fuel mixture and purge air for a two-stroke internal combustion engine, containing an inlet channel, according to the utility model, the inlet is additionally provided with a damper for controlling the flow of the air-fuel mixture and purge air, and the damper is connected by a damper rod and a rocker with a hinged support with a rod connected to a return spring and a regulator washer, which is set in motion with an equal distance between the weights of the centrifugal regulator from the shaft, depending on the frequency of its rotation.

The essence of the utility model is illustrated by drawings. In FIG. 1 shows a device for controlling the flow rate of the air-fuel mixture and scavenging air for a two-stroke internal combustion engine. In FIG. 2 shows the position of the damper in the intake port of the intake port.

A device for regulating the flow rate of the air-fuel mixture and scavenging air for a two-stroke internal combustion engine contains: 1 - damper; 2 - damper rod; 3 - inlet channel; 4 - damper guide; 5 - inlet; 6 - shaft; 7 - regulator washer; 8 - thrust; 9 - centrifugal regulator; 10 - rocker; 11 - hinged rocker support; 12 - return spring.

The operation of the device is as follows.

When the shaft 6 rotates, the weights of the centrifugal regulator 9 are equally removed from the shaft 6, setting in motion the regulator washer 7, which, overcoming the force of the return spring 12, moves the rod 8, which, through the rocker 10, fixed in the hinged support of the rocker arm 11, moves the damper rod 2, driving the damper 1 along the guide 4 (Fig. 1). The position of the damper 1 in the inlet 5 of the inlet channel 3 is regulated depending on the speed of the shaft 6 (Fig. 2), at the maximum speed of the shaft 6 the damper 1 is fully open.

Thus, the use of such a device makes it possible to achieve the optimum speed and reduce hydraulic losses in the inlet of the inlet channel in various engine operating modes.

Claims (1)

A device for regulating the flow rate of the air-fuel mixture and purge air for a two-stroke internal combustion engine, comprising an inlet channel, characterized in that the inlet is additionally equipped with a damper for regulating the flow rate of the air-fuel mixture and purge air, the damper being connected by a damper rod and a rocker arm with a hinged support with a rod, connected to the return spring and the washer of the regulator, which is set in motion with an equal distance between the weights of the centrifugal regulator from the shaft, depending on the frequency of its rotation.

Images