Surface Cam Pump Drive With Collinear Rotary-Reciprocating Conversion
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Solution Overview
Problem
Existing assemblies for converting rotary motion to linear reciprocating motion often suffer from inefficiencies and excessive friction due to transverse orientation, leading to wear and inefficiencies.
Innovation Solution
A surface cam planetary mechanism with a cam having an undulating surface and a support plate configured to engage this surface, allowing for direct conversion of rotational motion to linear reciprocating motion while maintaining compact size and constant output reduction ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transverse orientation is used for converting rotary motion to linear reciprocating motion, then the conversion function is achieved, but friction and wear between components increase excessively
Solution Approach 1:
The patent inverts the conventional transverse orientation by aligning the cam axis collinearly with the motor shaft axis. This inversion of the spatial relationship between components eliminates excessive friction and wear while maintaining the motion conversion function, directly resolving the technical contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the spatial parameter of component orientation from transverse to collinear alignment. By modifying the angular parameter (from 90 degrees to 0 degrees between cam axis and motor shaft axis), the system achieves reduced friction and wear while maintaining efficient motion conversion.
2Productivity
If conventional motion conversion assemblies are used, then rotary motion is converted to linear reciprocating motion, but the assembly size becomes excessive
Solution Approach 1:
The patent merges the cam mechanism with the motor shaft by aligning their axes collinearly, eliminating the need for separate transverse mounting structures. This consolidation reduces the overall assembly volume while maintaining full motion conversion capability, resolving the contradiction between productivity and compactness.
Solution Approach 2:
The cam is positioned within the motor housing structure, nesting the motion conversion mechanism inside the existing motor envelope. This nesting approach minimizes additional volume requirements while preserving the rotary-to-linear motion conversion function.
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 mechanism efficiently converts rotary motion to linear reciprocating motion with reduced friction and wear, achieving a compact and efficient design suitable for applications like pump drives.
Implementation Method 1
a planetary gear-reduction mechanism rotatably driven about a longitudinal axis by a motor or other drive mechanism
Implementation Method 2
The cam has a second side located opposite the first side. The second side includes a grooved depression defining an undulating surface along the circumference of the peripheral edge portion. Rotation of the support plate about the longitudinal axis relative to the cam results in reciprocating motion of the support plate along the longitudinal axis.
Data Source
AI summary
Various surface cam planetary mechanisms are described that convert rotational motion to linear reciprocating motion. Also described are assemblies using such mechanisms such as pump drives. A surface cam component used in the mechanisms includes a cam race that exhibits an undulating surface.