Variable Volume Compensation Tank for Hydraulic Motor
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Solution Overview
Problem
Hydraulic motors in work devices with pressure circulation systems face premature breakdown due to counterpressure from overflow oil, which shortens their service life.
Innovation Solution
A hydraulic apparatus with a tank section and drainage section, featuring a movable wall and non-return valves, manages overflow oil by reducing volume in one stage and increasing it in another, allowing controlled return and receipt of oil, thereby reducing counterpressure on the hydraulic motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overflow oil is led into a pressure accumulator, then the overflow oil can be stored and returned to the hydraulic system, but the counterpressure from the pressure accumulator shortens the service life of the hydraulic motor or even breaks it
Solution Approach 1:
The patent applies a movable wall (piston) that dynamically adjusts the volume of the liquid space in the tank section. During motor operation, the wall moves to increase liquid space volume, reducing counterpressure on the motor. During non-operation, the wall returns to its initial position to enable oil return to the hydraulic system. This dynamic adjustment resolves the contradiction by making the system adaptable to different operational states.
Solution Approach 2:
The hydraulic apparatus operates in periodic cycles: during the motor operation phase, overflow oil is received and stored with reduced counterpressure; during the non-operation phase, the liquid space volume is reduced to return oil to the hydraulic system. This periodic action pattern allows the system to alternate between receiving overflow oil and returning it, resolving the contradiction between storage and pressure management.
2Productivity
If the volume of the liquid space is reduced by moving the wall, then overflow oil can be returned to the hydraulic circulation, but the counterpressure increases during motor operation
Solution Approach 1:
The movable wall dynamically adjusts the liquid space volume based on operational requirements. During motor operation, the wall position maximizes liquid space volume to minimize counterpressure. During non-operation, the wall returns to reduce liquid space volume, enabling efficient oil return. This dynamic behavior resolves the contradiction by optimizing volume at different operational stages.
3Device complexity
If a fixed volume tank is used, then the structure is simple, but the counterpressure cannot be reduced to extend motor service life
Solution Approach 1:
The patent introduces a movable wall (piston) that can be actuated to change the liquid space volume. This dynamic element allows the system to reduce counterpressure during motor operation by increasing liquid space volume, thereby extending motor service life. The added complexity of the movable wall is justified by the significant improvement in motor reliability and service life.
Solution Approach 2:
The hydraulic apparatus is designed to automatically adjust the liquid space volume based on motor operational status. The movable wall can be actuated by hydraulic pressure differentials or external actuators to increase volume during motor operation and decrease it during non-operation, enabling the system to self-regulate counterpressure without complex external control systems.
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 extends the service life of hydraulic motors by minimizing strain from counterpressure, allowing the work device to operate efficiently without additional pressure lines, and preventing motor breakdowns, especially in high-speed applications like chain saws.
Implementation Method 1
a drainage section, which has been configured in a first operating stage to accomplish a reduction in the volume of the liquid space by moving the wall
Implementation Method 2
when in addition to this the hydraulic apparatus has in the first operating stage been arranged to return overflow oil to the hydraulic circulation through a non-return valve and in the second operating stage to receive overflow oil from the hydraulic motor through a second non-return valve
Data Source
Figure 1
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AI summary
A hydraulic apparatus (1) for the receiving and returning to pressure circulation of overflow oil of a hydraulic motor comprises: a tank section (26), which comprises an air-tight liquid space (23) that is in connection with at least one connector (21), the volume of which liquid space (23) is restricted by at least one movable wall (19), and a drainage section (25), which has been configured in the first operating stage (I) to accomplish a reduction in the volume of the liquid space (23) by moving the wall (19) and in the second operating stage (II) to release the wall (19) to enable an increase in the volume of the liquid space (23). Moreover, the hydraulic apparatus (1) has been arranged in the first operating stage (I) to return overflow oil to the hydraulic circulation (55) through a non-return valve (45) and in the second operating stage (II) to receive overflow oil from the hydraulic motor (49) through a second non-return valve (46). Also includes a parallel independent claim concerning a work device usable with pressure circulation and equipped with a hydraulic motor.