Hydraulic Pressure Supply Assembly With Eccentric Piston Drive

The patent replaces the traditional rack-and-pinion mechanical transmission system with a motor-driven piston system. The motor directly drives the piston through a drive shaft, eliminating the need for large rack gears and pinion gears. This substitution of mechanical transmission with a more compact actuation mechanism resolves the contradiction by maintaining braking pressure generation capability while significantly reducing the weight and size of the driving portion.

The patent segments the hydraulic supply device into distinct functional modules: a motor unit, a piston unit, and a valve unit. This segmentation allows each component to be optimized independently, with the piston directly coupled to the motor output shaft, eliminating the need for intermediate transmission components like rack and pinion. The modular design reduces overall weight while maintaining the required power output for braking pressure generation.

The patent employs asymmetric features on the piston and drive shaft to prevent rotation. Specifically, the piston includes an asymmetric keyway or flat surface that mates with a corresponding feature on the drive shaft, creating a non-circular interface that mechanically prevents rotational movement. This asymmetric design simplifies the overall structure compared to traditional ball-screw mechanisms while reliably preventing piston rotation during operation.

The patent introduces a keyed connection or splined interface as an intermediary element between the drive shaft and piston. This intermediary component transfers rotational motion from the motor to the piston's linear motion while preventing the piston from rotating. The keyed connection acts as a mediator that couples the rotational and linear motion functions while eliminating the reliability issue of piston rotation.

The patent merges multiple valve functions into a single integrated valve assembly or electronic control system. Instead of using separate physical valves for different braking functions (modulation, holding, releasing), the invention integrates these functions into one compact valve unit controlled by an electronic control unit (ECU). This merging of functions maintains full braking control capability while significantly reducing the number of discrete parts, thereby improving assembly productivity and reducing assembly time.

The patent replaces traditional mechanical valve systems with an electronic control system that uses an ECU to manage braking operations. The ECU receives signals from sensors and controls the hydraulic supply device and valve operations electronically, eliminating the need for complex mechanical linkages and multiple manually-adjusted valves. This substitution reduces the number of physical parts that require assembly while maintaining precise braking control capability.

The patent incorporates overload protection mechanisms that activate before excessive loads can cause damage to the compact hydraulic components. This includes pressure relief valves set to open at predetermined pressure thresholds, and torsion limits on the drive shaft that prevent transmission of excessive forces to the piston and valve assembly. These beforehand cushioning measures protect the compact design from damage while maintaining efficient space utilization.

The patent uses parameter changes in the form of pressure-sensitive control and variable stiffness elements to protect against excessive loads. The system includes pressure relief mechanisms that automatically adjust operating parameters when load thresholds are exceeded, and compliant mounting structures that can flex under excessive force. These parameter changes allow the compact apparatus to withstand extreme loads without permanent damage while maintaining its compact volume for efficient packaging.