Piston Pump Assembly for Hydraulic Brake Systems

The piston pump assembly employs a dynamically adjustable return stroke mechanism where the piston can be selectively connected or disconnected from the helical gear output element. During return stroke, the piston is disconnected to free-move, eliminating friction resistance. During working stroke, the piston is connected via force-locking to the output element to enable controlled bidirectional fluid displacement. This dynamic state change resolves the contradiction by minimizing energy loss during return stroke while maintaining adaptability for bidirectional operation.

The retainer mechanism is designed as a separate, extractable component that can be independently installed and removed from the cylinder assembly. The retainer engages with the piston through a simple geometric interface, allowing the piston to be retained in rotatably fixed manner without integrating complex retention features into the piston or cylinder themselves. This extraction approach maintains positioning stability while minimizing overall device complexity.

The disconnection control mechanism utilizes the natural direction of forces during return stroke to automatically disconnect the piston from the output element. The helical gear geometry and piston positioning are designed such that during return stroke, the natural movement tendency causes the piston to disengage from the force-locking connection without requiring active control inputs. This self-service approach reduces friction loss during return stroke while avoiding complex control mechanisms.