Hydraulic Pump Protection via Bypass Pressure Limiter
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Solution Overview
Problem
Hydraulic transmission systems for vehicles face challenges in maintaining safety and efficiency, particularly at high speeds, due to the risk of main pump damage from insufficient pressure and high power consumption from continuous auxiliary pump operation, along with compactness and maintenance issues related to clutch systems.
Innovation Solution
A hydraulic transmission system with a main pump and auxiliary pump actuated jointly by drive means, featuring a bypass connection with pump protection pressure maintained by first constriction means, eliminating the need for clutches and optimizing power consumption by using a low pump protection pressure, allowing continuous operation with minimal power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch system is provided to protect the main pump, then the main pump safety is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The harmful element (clutch system) is completely removed from the apparatus. Instead of using a clutch to protect the main pump, the invention uses a bypass connection with a pressure limiter that automatically maintains minimum pressure without any mechanical switching components, thereby eliminating complexity and maintenance needs while preserving pump safety
Solution Approach 2:
A bypass connection acts as an intermediary pathway between the auxiliary pump and the main pump inlet. This bypass, equipped with a pressure limiter, mediates pressure regulation without requiring direct interaction between the auxiliary pump and main pump, avoiding the need for complex clutch mechanisms while ensuring pump protection
2Reliability
If the auxiliary pump operates continuously to maintain minimum pressure, then the main pump protection is improved, but the power consumption increases
Solution Approach 1:
The pressure limiter parameter is set to a low value (minimum pressure sufficient for pump protection, e.g., 1-5 bar). By changing the pressure parameter to this optimized low level, the auxiliary pump consumes minimal power while still providing adequate protection to the main pump, resolving the contradiction between protection and energy consumption
Solution Approach 2:
The auxiliary pump performs only the partial action necessary for pump protection rather than full operational duty. By providing just enough pressure (minimum required pressure) through the bypass connection, the system achieves adequate protection with reduced energy consumption compared to continuous full-power operation
3Adaptability or versatility
If the main pump is actuated without delivering fluid, then the system flexibility is improved, but the risk of pump damage increases without sufficient pressure
Solution Approach 1:
The bypass connection with pressure limiter performs preliminary pressure establishment before the main pump operates. By pre-maintaining minimum pressure in the hydraulic circuit through the auxiliary pump and bypass, the system prepares the necessary pressure conditions in advance, allowing the main pump to start and operate flexibly without damage risk
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 ensures the main pump's safety without clutches, reduces power consumption, and simplifies maintenance, enabling efficient operation in both assisted and unassisted modes while maintaining the hydraulic motors in a positively declutched state.
Implementation Method 1
an auxiliary pump (25) serving to maintain some minimum fluid pressure in at least one auxiliary duct (41) of the apparatus
Implementation Method 2
first constriction means (62) arranged on said bypass connection and suitable for maintaining a pump protection pressure
Data Source
AI summary
A hydraulic transmission system for a vehicle is provided. The system includes a main pump serving to feed with fluid at least one hydraulic motor for driving a vehicle mover member; an auxiliary pump, the main pump and the auxiliary pump being suitable for being actuated jointly; and a “bypass” connection between a delivery orifice of the auxiliary pump and an unpressurized reservoir. In addition, a first constriction is arranged on the bypass connection, and configured to maintain a pump protection pressure in a pump protection portion of the bypass connection. This pressure is applied to the main orifices of the main pump when said pump is actuated but is not delivering, thereby ensuring that the pump is protected.