Find the detailed data of 1994 Beijing Jeep Cherokee 202 1 four-wheel drive carburetor.

Among various functional devices of carburetor, the main oil supply device

This device is the fuel supply device required by the engine under various working conditions except idle speed, and it is the basic fuel supply structure of carburetor. Idling device is a device that provides a small but rich mixture at idle speed to maintain the stable minimum speed of the engine. The enrichment device is an additional fuel supply device when the engine is under heavy load to make up for the shortage of main fuel supply.

Throttle is a device that provides extra fuel when the throttle opening suddenly increases when the car accelerates, which makes the engine speed and power increase rapidly. The starting device is a device that provides extremely rich mixture when the engine is cold started. The common method is to install a choke valve in front of the throat to control the air intake.

Idle speed should be mentioned here in particular. Idle speed is the most commonly used engine working condition, which is used in the engine warm-up process without stopping. It is of great significance to the driving performance of automobiles, especially when driving in cities. Idle speed often determines the fuel consumption and pollution discharge of a car.

Generally, the idle speed of the engine is only 600-800 rpm, and the throttle valve is close to closing. The throat vacuum generated by this speed cannot smoothly suck gasoline out of the float chamber, but the vacuum behind the throttle valve is very high. Therefore, it is only necessary to set an idle oil circuit on the basis of a simple carburetor, and its spray hole is set behind the throttle valve, and the problem is solved.

Because the mixture required for idling is small and thick, it is sensitive to the running condition of the engine. In order to realize the idle state with stability and minimum speed, it is necessary to adjust the fuel quantity control and the minimum throttle opening.

The existing carburetor idling device has two adjusting screws to adjust the fuel quantity and throttle opening respectively. At the same time, in order to prevent the car from turning off the ignition switch when the engine is still running, there is also an idle solenoid valve in the idle oil circuit of the carburetor, which is specially responsible for opening and closing the idle oil circuit to ensure that the engine can be quickly turned off.