At present, the clutch master cylinder is also called the clutch master pump. Its main function is to build up the pressure of the liquid in the clutch pipeline and transmit it to each clutch cylinder. The clutch cylinder generates thrust, pushing the separation fork to separate the clutch master and slave discs. When the clutch is engaged, as the pedal retracts, the pressure of the master cylinder of the clutch decreases, the force on the disengagement fork decreases, and the clutch gradually engages, but at the moment of engagement, the clutch contact speed is too fast, it is easy to produce shock, and the engine is stalled during the start phase .
The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, and to provide a clutch master cylinder which can adjust the output pressure in stages when the clutch is engaged, thereby making the clutch master-slave disc engaged at a slow speed at other stages The clutch engagement is unchanged.
A cylinder body, the cylinder body is provided with a main cylinder cavity, an upper cavity, a lower cavity and a medium delivery port, the upper cavity is in communication with the medium delivery port, and the lower cavity is in communication with the main cylinder cavity;
A valve core assembly, wherein the valve core assembly is slidingly fitted in the cylinder body, an elastic recovery assembly is provided between the valve core assembly and the cylinder body, and the upper cavity and the lower cavity act on the valve core assembly , The valve core assembly is provided with a medium inlet channel, a medium return channel, and is located between the medium inlet channel and the medium return channel and is used to disconnect the main cylinder cavity and the medium delivery port during the movement of the valve core assembly Isolation part of the passage between; when the pressure of the main cylinder cavity is greater than the pressure of the medium delivery port, and the spool assembly is upward in the cylinder body under the combined effect of the pressure of the upper cavity, the pressure of the lower cavity and the elastic recovery component When the cavity side moves, the master cylinder cavity communicates with the media delivery port through at least a portion of the media inlet channel; when the pressure of the master cylinder cavity is less than the pressure of the media delivery port and the spool assembly pressure in the upper cavity, the lower cavity Under the joint action of the pressure and the elastic recovery component, the main cylinder cavity communicates with the medium delivery port through at least a part of the medium return channel when moving to the lower cavity side in the cylinder body.