Switchable Pressure Relief in Lubricating Piston Pump
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Solution Overview
Problem
Existing lubricating devices require complex and costly mechanisms for switching lubricant delivery on and off and initiating pressure relief, such as electrically controlled directional control valves or complicated rocker arm mechanisms, which are inefficient and expensive, especially when using fluid greases.
Innovation Solution
A switchable eccentric drive with two identical eccentric sections, where one section drives the pump piston and the other controls pressure relief, allowing for simple mechanical control by reversing the direction of rotation, utilizing easily manufactured and durable metal components like cylinders or discs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically controlled directional control valves are used for pressure relief, then pressure relief function is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces electrically controlled directional control valves with a mechanically controlled system. An eccentric shaft with two eccentric sections mechanically actuates pump elements through rotating arms, eliminating the need for complex electrical control systems while achieving both lubricant delivery and pressure relief functions through pure mechanical means.
Solution Approach 2:
The eccentric shaft serves multiple functions: it simultaneously controls both lubricant delivery and pressure relief through its two eccentric sections. The same mechanical component (eccentric shaft) performs what would traditionally require separate control systems, reducing overall device complexity while maintaining reliability.
2Reliability
If rocker arm mechanism with control disc is used for pressure relief, then pressure relief is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The eccentric shaft is divided into two distinct eccentric sections, each with its own rotating arm and pump element. This segmentation allows independent control of delivery and pressure relief functions while using identical, simple manufacturing processes for each section, reducing overall manufacturing complexity compared to a single complex control mechanism.
Solution Approach 2:
The patent uses two identical eccentric sections with the same structural design and manufacturing process. Each section consists of an eccentric section on the shaft, a rotating arm, and a pump element. This copying approach simplifies manufacturing by repeating a proven, simple design rather than creating a complex unique mechanism.
3Productivity
If single eccentric section is used for lubricant delivery, then delivery function is achieved, but pressure relief function is missing
Solution Approach 1:
The eccentric shaft is designed with two eccentric sections that enable the system to perform multiple functions: lubricant delivery during one rotation phase and pressure relief during another phase. This multi-functionality is achieved within the same mechanical structure without requiring additional components or systems.
Solution Approach 2:
The system uses periodic action through the rotating eccentric shaft to alternately perform delivery and pressure relief functions. During one half of the rotation cycle, the first eccentric section drives the delivery pump while the second section remains inactive. During the other half, the roles reverse, enabling pressure relief. This periodic switching achieves functional versatility through temporal separation.
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
Enables efficient and cost-effective switching of lubricant delivery and pressure relief, ensuring that pressure relief is active only when delivery is switched off, effectively managing lubricant flow and reducing operational costs.
Implementation Method 1
The eccentric shaft has a first eccentric section arranged eccentrically to an axis of rotation of the eccentric shaft, which forms an eccentric drive that is dependent on the direction of rotation and with the aid of which the pump piston is set in an oscillating motion
Implementation Method 2
The eccentric shaft has a second eccentric section arranged eccentrically to an axis of rotation of the eccentric shaft, which forms a second eccentric drive that is dependent on the direction of rotation and with the aid of which the directional control valves for pressure relief are actuated
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The switchable pressure-relief device has lubricant pump having cam drive (18). A drive shaft connected to drive motor of pump has eccentric shaft (20) having eccentric cam portions (24,24') arranged at an axis of rotation (22). The eccentric sleeves (28,28') are rotatably mounted on eccentric cam portions, and operate eccentric cam drive. USE : Switchable pressure-relief device of lubricating device. ADVANTAGE : The pressure in the supply line when switching off can be efficiently released by simple mechanical control. DESCRIPTION OF DRAWINGS : The drawing shows a cross-sectional view of the switchable pressure-relief device. 18 : Eccentric cam drive 20 : Eccentric shaft 22 : Axis of rotation 24,24' : Eccentric cam portions 28,28' : Eccentric sleeves.