Hydraulic Actuating Device with Reversible Pump and Detenting Mechanism
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Solution Overview
Problem
Existing hydraulic actuating devices for motor vehicle gearboxes require high energy to maintain pressure and suffer from inefficiencies due to the need for frequent recharging of pressure stores and leakage issues with slide valves, leading to increased costs and reduced performance.
Innovation Solution
A hydraulic actuating device with a reversible pump and a detenting device that allows for controlled movement of the clutch setting cylinder piston, eliminating the need for a pressure store and slide valves, and ensuring power is only used when actuating the friction clutch, thereby reducing energy consumption and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure store is used to maintain hydraulic pressure, then the system can provide continuous pressure, but energy consumption increases significantly and frequent recharging is required
Solution Approach 1:
The pump is operated periodically only when pressure is needed for clutch actuation, rather than continuously maintaining pressure in a store. The control unit activates the pump based on detected clutch actuation requirements, eliminating energy-wasting continuous operation while ensuring pressure availability when needed.
Solution Approach 2:
The invention eliminates the pressure store component entirely from the system. By removing the pressure store, the patent avoids the energy inefficiencies and recharging issues associated with maintaining pressurized fluid reserves, while still achieving reliable pressure delivery through on-demand pump operation.
2Ease of operation
If slide valves are used for pressure control, then pressure distribution is achieved, but leakage occurs and high oil purity is required
Solution Approach 1:
The invention removes slide valves from the hydraulic system entirely. Pressure control and distribution are achieved through alternative means that do not rely on slide valves, thereby eliminating leakage problems and the requirement for high oil purity that slide valves impose.
Solution Approach 2:
The patent replaces the mechanical slide valve system with an alternative pressure control mechanism that is less susceptible to leakage. This substitution maintains pressure distribution functionality while improving reliability and reducing maintenance requirements.
3Stress or pressure
If a pressure store is charged to high pressure, then sufficient working pressure is available after pressure removal, but energy consumption increases and actuation is delayed
Solution Approach 1:
The system performs preliminary preparation by pre-positioning the clutch components and pre-charging the pump system when clutch actuation is anticipated. This allows rapid response when actual actuation is required, eliminating delays associated with charging pressure stores from scratch.
Solution Approach 2:
The pump system maintains readiness for continuous operation by operating in a sustained manner during periods of anticipated clutch activity, rather than intermittently charging a pressure store. This ensures pressure availability without the time loss associated with periodic recharging cycles.
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 significantly improves energy efficiency and reduces costs by minimizing power usage and eliminating the need for frequent recharging, while enhancing security against faulty actuations through the coordinated operation of the pump drive and actuator.
Implementation Method 1
a power unit for generating a hydraulic pressure via a pump, which is drivable by way of an electric pump drive, in order to displace hydraulic fluid in a pumping direction
Implementation Method 2
a blocking element which is resiliently biased into a blocking setting preventing movement of the piston
Data Source
AI summary
A hydraulic actuating device for a friction clutch and a gear setting element has a power unit for pressure generation by use of an electrically driven pump. Gear setting and clutch actuating sections are hydraulically connected to the power unit. A detenting device with a blocking element is associated with a piston of the clutch setting cylinder, which is operatively connected with the friction clutch and can be hydraulically loaded on opposite sides. The blocking element is resiliently biased into a blocking setting preventing piston movement and is movable by an actuator from the blocking setting into a release setting permitting piston movement. The pump is reversible in order to load the piston on one or the other side for an actuating movement. The control unit coordinates activation of the pump and actuator in order to disengage or engage the friction clutch.