Hydrostatic Drive Braking via Closed-Circuit Energy Dissipation
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Solution Overview
Problem
Current hydrostatic drive systems require an additional hydraulic pump and complex valve regulation for braking, involving both the travel drive and working hydraulics, which is inefficient and limits braking power.
Innovation Solution
A hydrostatic drive system where the hydraulic pump and motor in a closed circuit are adjusted to manage braking through a brake actuation device, using pressure-limiting valves to convert kinetic energy into heat without an additional hydraulic pump, allowing braking to occur solely within the closed circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an additional hydraulic pump and complex valve regulation are used for braking, then braking power can be increased, but device complexity increases and braking efficiency decreases
Solution Approach 1:
The braking function is merged with the existing closed-circuit hydrostatic drive components. The hydraulic motor serves dual purposes: as a drive motor during operation and as a pump during braking. The pressure-limiting valve, originally intended to protect the closed circuit, is repurposed to dissipate braking energy. This eliminates the need for separate braking components while achieving effective braking power.
Solution Approach 2:
Existing components are given multiple functions. The hydraulic motor functions as both a drive motor and a pump. The pressure-limiting valve serves both circuit protection and braking energy dissipation. This multi-functionality reduces system complexity while maintaining braking capability.
2Power
If an additional hydraulic pump is connected in open circuit for braking, then braking effect can be generated, but the braking process involves both travel drive and working hydraulics increasing operational complexity
Solution Approach 1:
The braking operation is merged entirely within the closed circuit of the travel drive. By adjusting the hydraulic motor's absorption volume and using the pressure-limiting valve, braking is achieved without involving the working hydraulics open circuit. This simplifies operation to a single integrated system rather than coordinating multiple independent systems.
3Power
If the hydraulic motor is adjusted to larger absorption volume during braking, then kinetic energy can be dissipated more effectively, but energy is converted to heat
Solution Approach 1:
The harmful effect of heat generation during energy dissipation is accepted as an unavoidable consequence of converting kinetic energy. However, the system efficiently manages this by using the existing pressure-limiting valve, which is already designed to handle high pressures and heat generation for circuit protection. The braking function leverages this existing capability rather than creating new heat management challenges.
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
This solution enables efficient braking within the closed hydraulic circuit, utilizing the drive motor's power and minimizing heat generation, providing a proportional and calculable braking effect without the need for an additional hydraulic pump, thus optimizing braking performance and simplifying the system.
Implementation Method 1
Kinetic energy, which needs to be dissipated, is converted into heat
Data Source
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AI summary
The invention relates to a hydrostatic drive (1) and a method for braking a hydrostatic drive (1). In the hydrostatic drive (1), a hydraulic pump (3) is connected to a hydraulic motor (4) by means of a first and a second working line (11, 12). The hydrostatic drive (1) comprises a brake actuating device (37) on at least one pressure relief valve (26, 30) which is connected to the working line arranged downstream of the hydraulic motor (4). The brake pump volume of the hydraulic pump (3) can be regulated upon detection of an actuation of the brake actuation device (37). The hydraulic motor (4) is regulated according to the actuation intensity of the brake actuation device (37) in order to achieve larger absorption volumes, when the actuation intensity of the brake actuation device (37) increases.