The clutch master pump includes a cylinder body. A pressure-building piston is provided inside the cylinder body. A booster piston connected to the pressure-building piston is provided on the right side of the pressure-building piston. The first end of the pressure-building piston is provided with a first connecting rod hole In the middle of the left end face of the boosting piston, there is a second connecting rod hole. The boosting piston and the pressure-building piston are movably connected by a connecting rod. The connecting rod is provided in the first connecting rod hole and the second connecting rod hole. When the clutch pedal is depressed, the rotation of the pedal rocker arm drives the push rod to make an arc motion, and the pedal force acts on the boost piston through the push rod. At this time, the push rod and the boost piston are not coaxial, so the boost piston exists A separating force in the direction of motion and a lateral separating force perpendicular to the direction of motion; the separating force in the direction of motion is transmitted to the pressure-building piston through the connecting rod, which is connected between the boosting piston and the pressure-building piston due to the movable movement of the connecting rod , A vertical lateral separation force is offset by pushing the right end of the connecting rod downward to adjust the position. At this time, the pressure-building piston is only affected by the force of the movement direction, and it will not cause partial wear due to the lateral separation force. The lateral separation force causes friction between the pressure build-up piston and the cylinder, reducing the service life of the pressure build-up piston and the seal.
Preferably, the left end of the connecting rod is provided in the first connecting rod hole and is in contact with the pressure-building piston, and the right end of the connecting rod is provided in the second connecting rod hole and in contact with the booster piston. The diameter of the second connecting rod hole and the diameter of the second connecting rod hole are equal to the diameter of the connecting rod. The booster piston clamps the right end of the connecting rod through the second connecting rod hole to improve the stability of the connecting rod during the movement of the boosting piston. When the boosting piston moves, the vertical side is offset by driving the connecting rod in the first connecting rod hole To the separating force, the separating force in the moving direction is transmitted to the pressure-building piston through the connecting rod, so the pressure-building piston will not be subjected to the vertical lateral separating force to tilt the pressure-building piston, reducing the failure rate of the clutch master cylinder.