External Pinion Pump Drive for Reciprocating Motion Conversion
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Solution Overview
Problem
Existing fluid displacement systems, such as those used in fluid dispensing systems for paint, face inefficiencies in converting rotational motor output to linear reciprocating motion for fluid pumping, often requiring complex mechanisms that extend through the motor and overlap with electromagnetics, leading to structural limitations and maintenance challenges.
Innovation Solution
A drive system for reciprocating fluid displacement pumps utilizing an electric motor with an eccentric driver, where the rotor rotates outside the stator and a pinion drive extends axially from the rotor, supported by dual bearings, converting rotational output to linear motion through a gear interface, allowing modular assembly and high torque, low-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex mechanisms are used to convert rotational motor output to linear reciprocating motion, then the conversion can be achieved, but the device complexity increases and structural limitations occur
Solution Approach 1:
The patent extracts the pinion drive from the motor interior and positions it externally, allowing the motor to rotate freely without internal mechanical obstructions. This separation eliminates the need for complex internal mechanisms while achieving the desired motion conversion through the external pinion-gear interface.
Solution Approach 2:
The pinion drive acts as an intermediary component that converts the motor's rotational output to linear reciprocating motion through its engagement with the gear teeth. This intermediate mechanism simplifies the overall system by providing a straightforward rotational-to-linear conversion without requiring complex internal motor modifications.
2Power
If mechanisms extend through the motor, then rotational output can be transmitted, but the electromagnetics are overlapped and structural limitations occur
Solution Approach 1:
The pinion drive is extracted from the motor's internal structure and positioned externally, eliminating any overlap with the electromagnetic components. This allows the motor to operate without mechanical obstructions in its magnetic field path, preventing electromagnetic interference while still achieving effective power transmission through the external gear interface.
3Volume of moving object
If integrated motor-pump design is used, then structural compactness is achieved, but maintenance complexity increases
Solution Approach 1:
The patent segments the pump drive system into distinct modular components: the motor assembly, the pinion drive, and the pump mechanism. This segmentation maintains structural compactness while enabling independent maintenance of each module, as components can be accessed and replaced without disassembling the entire integrated system.
4Stress or pressure
If high torque low-speed operation is required, then pumping pressure is increased, but the mechanism becomes more complex
Solution Approach 1:
The patent replaces complex mechanical torque multiplication mechanisms with a direct electric motor design optimized for high torque low-speed operation. The motor's electromagnetic design inherently provides the required torque characteristics without additional mechanical complexity, while the simple pinion-gear interface maintains the straightforward structural approach.
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 conversion of rotational to linear motion with high pumping pressures, facilitating modular assembly and reducing maintenance complexity, suitable for applications requiring high fluid pressures for atomization and application on surfaces.
Implementation Method 1
an electric motor configured to generate a rotational output and having a stator and a rotor configured to rotate on a motor axis
Implementation Method 2
a pinion cap formed separate from and attached to the rotor, the pinion cap including a gear teeth section; a drive interfacing the pinion cap at a toothed interface to receive the rotational output from the electric motor via the pinion cap, the drive configured to convert the rotational output into reciprocating motion
Implementation Method 3
an eccentric that receives rotational motion from the drive gear; and a pump that receives reciprocating motion from the eccentric
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A rotational output assembly is configured to provide power to a drive assembly to cause pumping by a pump. The rotational output assembly includes an electric motor and a pinion drive projecting axially from the motor. The pinion drive interfaces with bearings supported on a pump frame. The pinion drive includes a gear teeth section between portions interfacing with the bearings supported on the pump frame. The gear teeth section interfaces with a drive gear of the drive assembly to cause rotation of the drive gear.