Axial Pump Assembly With Common-Axis Direct Drive
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Solution Overview
Problem
Existing hydraulic tools are complex, heavy, and bulky, particularly in high-force applications, leading to increased manufacturing costs and user inconvenience.
Innovation Solution
The axial pump assembly integrates mechanisms for reciprocation and speed reduction into a compact system, eliminating the need for external gear reducers by using components arranged about a common axis, including a reciprocating element, drive element, and ball or bearing elements, which generate reciprocating motion efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a motor, hydraulic pump, and gear assembly are used in hydraulic tools for high force applications, then high force capability is achieved, but the tool becomes complex, heavy, and bulky
Solution Approach 1:
The patent combines the motor shaft and pump drive shaft into a single common axis, merging previously separate components (motor, pump, and gear assembly) into an integrated unit. This eliminates the need for external gear reducers and transmission mechanisms, directly resolving the technical contradiction by maintaining force capability while reducing device complexity
Solution Approach 2:
The motor shaft serves multiple functions simultaneously: it acts as both the motor's rotating component and the pump's drive shaft. This multi-functionality eliminates the need for separate transmission components, reducing overall system complexity while maintaining the required force output for high-force applications
2Force
If a motor, hydraulic pump, and gear assembly are used in hydraulic tools for high force applications, then high force capability is achieved, but the tool becomes heavy and bulky
Solution Approach 1:
By merging the motor shaft and pump drive shaft into one component, the patent eliminates redundant parts such as gear reducers and separate transmission shafts. This consolidation directly reduces the overall weight of the hydraulic tool while preserving its high-force capability
Solution Approach 2:
The invention extracts and eliminates the gear assembly from the system by designing a direct-drive configuration where the motor shaft directly drives the pump. This removal of unnecessary components reduces both weight and complexity while maintaining force output
3Force
If a motor, hydraulic pump, and gear assembly are used in hydraulic tools for high force applications, then high force capability is achieved, but manufacturing cost increases
Solution Approach 1:
The integration of motor shaft and pump drive shaft into a single component reduces the total number of parts that need to be manufactured, assembled, and quality-checked. This simplification directly lowers manufacturing costs while maintaining the required force capability for high-force applications
Solution Approach 2:
By extracting and eliminating the gear assembly from the design, the patent reduces manufacturing complexity and material requirements. This removal of unnecessary components directly decreases manufacturing cost while preserving force output
4Force
If a motor, hydraulic pump, and gear assembly are used in hydraulic tools for high force applications, then high force capability is achieved, but the tool becomes cumbersome for operator use
Solution Approach 1:
The consolidated design with a common axis for motor and pump shafts creates a more compact and balanced tool configuration. This reduces the tool's footprint and improves handling characteristics, making it easier for operators to use while maintaining high-force capability
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
This design reduces the size and complexity of the transmission end of hydraulic tools, providing stable motion and user-friendly operation while maintaining high force capabilities.
Implementation Method 1
A first ball element or first bearing element can be positioned within the first ramped radial channel and can be configured to convert rotational motion into reciprocating motion of the reciprocating element in the axial direction
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 1F
AI summary
Embodiments of the invention provide a pump assembly for a hydraulic tool. The pump assembly can include a reciprocating element (102) that is configured to move between a retracted position and an extended position, a cam surface (114) in the reciprocating element that can engage cam followers, a rotating element (104) that can receive rotational input, and a base (110) that can at least partially surround the rotating element (104). Movement of the cam followers (108) along the cam surface (114) can move the reciprocating element (102) from the retracted position to the extended position.