Pneumatic starting system protection device of diesel engine for automobile

Abstract

The invention discloses a pneumatic starting system protection device of a diesel engine for an automobile. The pneumatic starting system protection device comprises an air storage tank, a filter, a mechanical valve, a two-position three-way hydraulic reversing valve, a pneumatic starting motor, a main starting valve, a diesel engine, a hydraulic pump and a one-way throttle valve , wherein the air outlet of the air storage tank is connected with the air inlet of the filter via a pipeline; the air outlet of the filter is divided into two paths through pipelines, wherein one path is connected with the gear pre-engaged air inlet of the pneumatic starting motor through the mechanical valve and the two-position three-way hydraulic reversing valve in sequence, and the other path is connected with the air inlet of the pneumatic starting motor through the main starting valve; the gear pre-engaged air inlet of the pneumatic starting motor is connected with the control hole of the main starting valve through the pipeline; the flywheel of the diesel engine is connected with the power input end of the hydraulic pump through a transmission mechanism; the liquid inlet of the hydraulic pump is connected with an tar tank; the liquid outlet of the hydraulic pump is connected with the control hole of the two-position three-way hydraulic reversing valve through the pipeline and the one-way throttle valve. According to the pneumatic starting system protection device, after an engine is started, a starting motor control air path can be cut off when the revolving speed is within 300rpm.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a protective device for a pneumatic starting system of a vehicle diesel engine. Background technique [0002] In the prior art, diesel engines are usually provided with a pneumatic starting system. After the diesel engine is started, if the pinion of the air starter motor collides with the high-speed rotating flywheel ring gear again, it will cause damage to the air motor and diesel engine. [0003] Chinese invention patent (Patent No. 201220616469.4) provides a "air motor safety start protection device", which is divided into three air circuits; The other end of the one-way valve is connected with the metal tee with the rubber hose assembly, and connected with the air filter, rubber hose assembly and air storage tank through the joint, and the other end of the tee is connected with the starting valve through the joint, and through the live joint, stainless steel The tu...

AI Technical Summary

Problems solved by technology

However, in the prior art, because the air compression pump builds up pressure slowly after running, the engine is ignited and started, and the air compression pump can generate enough air pressure to cut off the starter motor control air circuit after reaching the idle speed (800rpm) or even a higher speed. At this time, the starter motor pinion and the engine flywheel ring gear have worn out

Some people are used to start the gas while starting, so that once the engine is ignited, the speed will immediately rise above 1000rpm, which will also cause damage to the motor and engine

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