Gerotor Motor Friction Brake for Smooth Release on Slopes
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Solution Overview
Problem
Existing parking brake systems for low-speed, high-torque gerotor motors are prone to improper vehicle positioning and difficulty in releasing the brake, especially on steep slopes, and can cause mechanical shock when released.
Innovation Solution
A hydraulic drive device with a mechanical friction brake system that includes a brake arrangement and a brake release mechanism, allowing for precise braking and release control through orbital and rotational movements of the gerotor star and brake hub, utilizing spring-biased brake pads and hydraulic actuation for engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin brake is used with predetermined braking points, then the brake can be applied at specific positions, but the vehicle positioning becomes improper and the brake release becomes difficult on steep slopes
Solution Approach 1:
The patent replaces the mechanical pin brake system with a hydraulic brake system. The hydraulic brake uses fluid pressure to apply braking force through a brake piston and brake pads, eliminating the need for mechanical pins and predetermined braking points. This substitution allows the brake to be applied and released smoothly at any position, including steep slopes, by controlling hydraulic pressure rather than mechanical alignment.
Solution Approach 2:
The patent implements a hydraulic braking system where hydraulic fluid is used to transmit force to the brake piston. The brake piston converts hydraulic pressure into mechanical force to press the brake pads against the brake drum. This hydraulic mechanism enables smooth brake application and release without the positioning constraints of mechanical pin systems, particularly improving performance on steep slopes.
2Device complexity
If a pin brake is used, then the brake structure is simple, but mechanical shock occurs when the pin brake is released
Solution Approach 1:
The hydraulic brake system replaces the mechanical pin release mechanism with a hydraulic pressure control system. The brake is released by reducing hydraulic pressure, allowing the brake spring to smoothly retract the brake piston and brake pads from the brake drum. This gradual pressure reduction eliminates the sudden mechanical shock that occurs when a pin brake is rapidly released.
Solution Approach 2:
The hydraulic system provides cushioning during brake release by gradually reducing pressure rather than abruptly removing the braking force. The hydraulic fluid acts as a cushion, allowing controlled dissipation of energy as the brake pads separate from the drum, preventing the shock and vibration associated with sudden mechanical pin release.
3Adaptability or versatility
If the brake is incorporated into the motor, then the braking function is integrated, but the device complexity increases
Solution Approach 1:
The patent merges the brake system with the gerotor motor by positioning the brake drum concentric with the motor's central axis and integrating the brake piston and release mechanism within the motor housing. The brake drum is mounted on the central shaft, and the brake pads are positioned to engage the drum's outer surface. This integration allows the brake to be incorporated into the motor without requiring separate external brake components, achieving space-efficient design while maintaining functional independence.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides reliable braking and safe release of the brake at any point in the motor's revolution, ensuring proper vehicle positioning and reducing mechanical shock, particularly on slopes, by integrating the brake within the hydraulic drive device's footprint.
Implementation Method 1
The brake piston is spring biased axially toward the first and second brake pads by a brake spring
Implementation Method 2
A brake piston is configured to press the first and second brake pads axially together to provide braking of the gerotor hydraulic motor arrangement
Data Source
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AI summary
A hydraulic drive device (100), wherein a mechanical friction brake (124, 132, 134) is implemented within a gerotor hydraulic motor (113). Orbital movement of a gerotor star (118) is transformed into rotational movement of a set of brake pads (132) via a brake hub (124). Rotational movement of a gerotor outer ring (114) is transferred to another set of brake pads (134). The two sets of brake pads (132, 134) are axially pressed together to brake the gerotor motor (113). Braking force to compress the brake pads is applied via a spring force (138) and removed by transferring the motor's operating pressure to a brake piston (136) via a release member (139, 201) extending through a central shaft (130) and the brake hub (124).