Movable-Stator Pump Drive for Independent Hydraulic Flow Control
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Solution Overview
Problem
Existing remote controlled drive assemblies with solenoids are large, heavy, and complex, compromising safety and user comfort in portable tools by increasing size and weight, while prior art valveless hydraulic systems fail to address independent flow direction control and separate lubrication circuits.
Innovation Solution
A drive assembly with a movable stator and control valve that allows a single control signal to control multiple drive modes, directing hydraulic flow independently of driving direction through a control valve, eliminating the need for solenoids and enabling a compact, lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solenoids are used to control valve position in remote controlled drive assemblies, then the valve position can be controlled, but the assembly becomes large, heavy, and complex
Solution Approach 1:
The invention removes the solenoid from the drive assembly, extracting the complex electromagnetic control component while maintaining valve position control capability through alternative means. This directly addresses the contradiction by eliminating the source of complexity while preserving the essential control function.
Solution Approach 2:
The drive motor is designed to perform multiple functions: it both drives the pump and controls the valve position through its control modes. This multi-functionality eliminates the need for separate solenoid components, reducing overall assembly complexity while maintaining full control capability.
2Ease of operation
If solenoids are used to control valve position, then the valve position can be controlled, but the assembly size and weight increase
Solution Approach 1:
By removing the solenoid from the system, the invention directly reduces assembly weight while maintaining valve position control through the drive motor's control modes, thus resolving the contradiction between control capability and weight.
3Device complexity
If a valveless hydraulic system with direct motor-pump coupling is used, then the system is simplified, but the hydraulic flow direction cannot be independently controlled
Solution Approach 1:
The drive motor is designed with multi-functionality: it both drives the pump and controls valve position through different control modes. This allows the system to maintain simplicity while gaining independent flow direction control capability, resolving the contradiction between simplicity and versatility.
Solution Approach 2:
The invention introduces dynamic control capability where the drive motor can operate in different control modes to dynamically adjust valve position and flow direction. This transforms the static valveless system into a dynamically controllable system, enabling independent flow direction control while maintaining relative simplicity.
4Reliability
If remote operation capability is implemented, then safety is improved, but the assembly size and weight increase due to solenoids
Solution Approach 1:
By removing the heavy solenoid components while maintaining remote control capability through alternative mechanisms, the invention achieves safe remote operation without the weight penalty, thus resolving the contradiction between safety and weight.
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 solution provides a reliable, robust, and compact drive assembly suitable for remotely controlled portable tools, ensuring safe operation and improved user comfort by allowing independent flow direction control and reducing the assembly's size and weight.
Implementation Method 1
an electric motor that comprises a rotor and a stator, wherein the stator is configured to be set in one of a plurality of stator positions that are each associated with one of the plurality of drive modes
Implementation Method 2
a pump that is drivable by the drive and configured to produce an hydraulic flow
Implementation Method 3
a control valve that is configured to be set in a valve position associated with the selected drive mode and configured to thereby direct the hydraulic flow produced by the pump
Data Source
AI summary
A drive assembly and system include a drive, controllable to exhibit a selected one of a plurality of drive modes that include driving the drive in one of a first driving direction and a second driving direction, the second driving direction being directed opposite relative to the first driving direction, a pump that is drivable by the drive and configured to produce a hydraulic flow to flow in a flow direction independent of the first or second driving direction of the selected drive mode, and a control valve that is configured to be set in a valve position associated with the selected drive mode and configured to thereby direct the hydraulic flow produced by the pump depending on the selected drive mode of the drive along a selected one or more of a plurality of flow paths that are arranged downstream of the pump.