Quantitative oil return valve and braking system and wheeled vehicles

Abstract

The invention relates to a hydraulic part, and provides a quantitative oil return valve and a brake system and a wheeled vehicle. The problem that the brake distance is increased due to the wear of afriction plate in an existing brake is solved. The quantitative oil return valve includes an oil inlet, an oil outlet, an oil filling hole and a valve body, a piston and a one-way valve of a quantitative oil chamber. The piston is located in the quantitative oil chamber and the quantitative oil chamber is separated into a first oil chamber and a second oil chamber which do not communicate. The oilinlet communicates with the first oil chamber, the oil outlet communicates with the second oil chamber, and the one-way valve is arranged between the oil filling hole and the oil outlet, and single breakover is achieved from the oil filling hole to the oil outlet. When the piston is at the initial position of the oil return distance, the oil filling hole communicates with the first oil chamber, and when the piston leaves the initial position of oil return distance, the oil filling hole is cut off from the first oil chamber. The quantitative oil return valve is used in a wheeled vehicle braking system, the braking distance of a braking piston is related to a maximum value of the capacity change of the second oil chamber of the quantitative oil return valve, and the braking distance is constant and does not change with the clearance of the friction pair.

Description

technical field [0001] The invention relates to a hydraulic component, more specifically, to a quantitative oil return valve, a brake system and a wheeled vehicle. Background technique [0002] In the wet brake, there is a friction pair composed of friction plates and lining plates and a brake cylinder that pushes the friction pairs to engage or disengage. Plate contact, relative sliding friction or relative static between the friction plate and the liner to achieve the braking function, when the brake is canceled, the piston returns to the fixed position under the action of the return spring. With the increase of the use time of the friction pair, the wear and tear of the friction plate and the liner gradually increase, and the stroke required for the piston to push the friction plate to contact or engage with the liner increases, which makes the travel of the brake piston on the brake longer. More brake pressure oil is needed, the response time of the brake is longer (ful...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a quantitative oil return valve, a braking system and a wheeled vehicle to solve the problem of increasing the braking stroke caused by the wear of the friction lining in the existing brakes.

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