Axial Pump Assembly With Cam-Driven Internal Speed Reduction
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Solution Overview
Problem
Existing hydraulic power tools are complex, heavy, and bulky, making them cumbersome and costly, particularly for high force applications, and not user-friendly.
Innovation Solution
The axial pump assembly features a reciprocating element with ramped radial channels and ball elements that drive a pump piston, eliminating the need for a gear reducer and allowing for compact design with internal speed reduction, enabling stable and efficient motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gear reducer or gear assembly is used to drive the hydraulic pump, then the motor can effectively drive the pump, but the tool becomes complex, heavy, and bulky
Solution Approach 1:
The patent extracts and eliminates the gear reducer/gear assembly from the hydraulic tool design. By using a cam-driven reciprocating pump mechanism instead of a motor-gear-pump arrangement, the complex gear transmission system is removed entirely, simplifying the overall device while maintaining hydraulic force generation capability
Solution Approach 2:
Instead of using a rotating motor with gear reduction to drive a pump, the invention inverts the approach by using a reciprocating cam mechanism that directly generates hydraulic pressure through alternating compression and expansion of a spring-loaded piston, eliminating the need for traditional rotational-to-rotational gear transmission
2Power
If a gear reducer or gear assembly is used to drive the hydraulic pump, then the motor can effectively drive the pump, but the tool becomes heavy and bulky
Solution Approach 1:
The patent removes the heavy gear reducer and gear assembly from the tool design. The cam-driven reciprocating pump mechanism uses lightweight components including a spring-loaded piston, cam follower, and cam lobe, significantly reducing the overall weight while maintaining sufficient hydraulic force for cutting and crimping applications
Solution Approach 2:
The invention replaces the heavy motor-gear-pump rotational system with a lightweight reciprocating spring-cam mechanism that generates hydraulic pressure through elastic energy storage and release, dramatically reducing the weight of moving parts while maintaining power output
3Power
If a gear reducer or gear assembly is used to drive the hydraulic pump, then the motor can effectively drive the pump, but the tool becomes cumbersome and less user-friendly
Solution Approach 1:
By removing the complex gear reducer and gear assembly, the patent creates a more compact and maneuverable tool that is easier for operators to handle and position. The simplified cam-driven mechanism reduces the tool's overall size and improves accessibility in tight work spaces
Solution Approach 2:
The reciprocating spring-cam mechanism creates a more compact tool form factor compared to the extended motor-gear-pump arrangement, improving ease of operation and user-friendliness while maintaining sufficient hydraulic force for high-force cutting and crimping applications
4Power
If a gear reducer or gear assembly is used to drive the hydraulic pump, then the motor can effectively drive the pump, but the manufacturing cost increases
Solution Approach 1:
The patent eliminates the expensive gear reducer and gear assembly from the design, reducing the number of precision-machined components and assembly steps. The cam-driven reciprocating pump uses simpler, more cost-effective components that are easier to manufacture and assemble
Solution Approach 2:
By inverting the traditional motor-gear-pump architecture to a spring-cam-reciprocating pump system, the invention reduces manufacturing complexity and cost through fewer parts, simpler assembly procedures, and the use of standard elastic components rather than custom precision gear trains
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 axial pump assembly reduces the size and complexity of hydraulic tools, providing stable motion and efficient force transmission while being more user-friendly and cost-effective.
Implementation Method 1
ball elements configured to roll on a race portion
Implementation Method 2
ramped radial channels extending radially outward from an inner circumferential surface of the reciprocating block
Data Source
AI summary
Embodiments of the invention provide a pump assembly for a hydraulic tool. The pump assembly can include a reciprocating element that is configured to move between a retracted position and an extended position, a cam surface in the reciprocating element that can engage cam followers, a rotating element that can receive rotational input, and a base that can at least partially surrounds the rotating element. Movement of the cam followers along the cam surface can move the reciprocating element from the retracted position to the extended position.