Piston Pump Eccentric Sliding Bush for Wear and Noise Reduction
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Solution Overview
Problem
Existing piston type pumps require close manufacturing tolerances, leading to increased assembly time and cost, and suffer from non-rectilinear piston movements causing wear and noise issues.
Innovation Solution
A piston type pump design featuring a first sliding bush between a first eccentric and a first sliding block guide, allowing translational movement along a main axis and restricted movement along a minor axis, with a tapered surface contact to minimize friction and wear, and a biasing member to maintain constant contact and compensate for manufacturing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If close manufacturing tolerances are required for the drive assembly, then the pump performance and reliability are improved, but the assembly time and manufacturing cost increase
Solution Approach 1:
A sliding bush is introduced as an intermediary component between the eccentric and the sliding block guide. This sliding bush acts as a mediator that absorbs manufacturing tolerances and misalignments, allowing the connection to function properly without requiring extremely precise manufacturing of the eccentric and guide components directly against each other.
Solution Approach 2:
The design changes the geometric parameters of the sliding bush to accommodate tolerance variations. By optimizing the bush dimensions, material properties, and clearance specifications, the system can operate reliably within broader manufacturing tolerance ranges, reducing the need for tight tolerances on mating surfaces.
2Reliability
If close manufacturing tolerances are required for the drive assembly, then the pump performance and reliability are improved, but the manufacturing cost increases
Solution Approach 1:
The sliding bush serves as a cost-effective intermediary that replaces the need for expensive precision machining of the eccentric and guide. By using a standardized bush component with moderate tolerances, the overall manufacturing cost is reduced while maintaining reliable operation.
Solution Approach 2:
The sliding bush is designed as a simpler, more economical component that can be manufactured with standard tolerances. While it may have a limited service life compared to precision-machined direct connections, its lower manufacturing cost and ease of replacement make it an economically favorable solution.
3Device complexity
If non-rectilinear movement is allowed in the piston, then the drive mechanism complexity is reduced, but wear on piston and cylinder increases
Solution Approach 1:
The sliding bush acts as a mediator between the eccentric motion and the piston rod, providing a low-friction interface that accommodates the non-rectilinear movement. This intermediary component is specifically designed to handle the lateral and angular loads, protecting the piston and cylinder from excessive wear while allowing the simplified drive mechanism to function.
Solution Approach 2:
The design optimizes parameters such as the sliding bush material composition, surface finish, lubrication characteristics, and geometric dimensions to minimize wear. By carefully selecting these parameters, the system tolerates non-rectilinear piston movement while maintaining acceptable wear rates and service life.
4Device complexity
If non-rectilinear movement is allowed in the piston, then the drive mechanism complexity is reduced, but noise emissions increase
Solution Approach 1:
The sliding bush serves as a noise-damping intermediary between the eccentric and piston rod. This component absorbs vibrations and dampens the noise generated by non-rectilinear piston movement, allowing the simplified drive mechanism to operate with acceptable noise levels.
Solution Approach 2:
The design optimizes parameters including the sliding bush material damping properties, surface finish, clearance tolerances, and lubrication to minimize vibration and noise. By carefully controlling these parameters, the system achieves low noise emissions despite the non-rectilinear motion inherent in the simplified drive mechanism.
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
Reduces manufacturing costs, improves wear characteristics, and lowers noise emissions while ensuring stable operation and compact design.
Implementation Method 1
A first sliding bush is arranged between a first eccentric and a first sliding block guide, wherein an outer surface of the first sliding bush corresponds to an inner surface of the first sliding block guide and wherein translational movement of the first sliding bush relative to the first sliding block guide is allowed along a main axis and restricted along a minor axis
Data Source
AI summary
A piston type pump includes a pump housing having a pump inlet, a pump outlet, and a piston arrangement connected to a drive shaft. The drive shaft is configured to drive the piston arrangement, and the drive shaft includes a first eccentric. The piston arrangement has a first primary stage piston connected to a first sliding block guide slidably seated on the first eccentric. The first sliding block guide has a main axis, a minor axis, and an inner surface. A first sliding bush is arranged between the first eccentric and the first sliding block guide. The outer surface of the first sliding bush corresponds to the inner surface of the first sliding block guide. Translational movement of the first sliding bush relative to the first sliding block guide is allowed along the main axis and restricted along the minor axis.