Balanced Axial Piston Pump Layout for Compact High-Force Tools
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Solution Overview
Problem
Existing hydraulic tools are complex, heavy, and bulky, particularly for high force applications, leading to increased manufacturing costs and user discomfort.
Innovation Solution
A balanced pump-axial piston pump design featuring a motor with a gearbox, camshaft, ball followers, lift block, and spring, which provides hydraulic power through a compact and efficient reciprocating mechanism with reduced radial movement and side loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a motor with gear reducer or gear assembly is used to drive the hydraulic pump, then the tool can provide high force output, but the tool becomes complex, heavy, and bulky
Solution Approach 1:
The patent extracts and eliminates the gear reducer and gear assembly from the hydraulic tool design. By using a cam-driven piston mechanism directly connected to the motor shaft, the complex transmission components are removed entirely, simplifying the overall device structure while maintaining force output capability through the cam-lift block-piston mechanism.
Solution Approach 2:
Instead of using a motor-gear-pump traditional sequence, the patent inverts the approach by using a motor-cam-lift block-piston direct drive sequence. The cam converts rotational motion to reciprocating linear motion of the lift block, which directly drives the piston, eliminating the need for intermediate gear reductions.
2Force
If a motor with gear reducer or gear assembly is used to drive the hydraulic pump, then the tool can provide high force output, but the tool becomes heavy and bulky
Solution Approach 1:
The patent extracts and eliminates the heavy gear reducer and gear assembly components. The simplified cam-driven mechanism uses lighter materials and fewer components, significantly reducing the overall weight of the hydraulic tool while maintaining the ability to generate high force through the piston.
Solution Approach 2:
By inverting the traditional drive sequence to use direct motor-cam-lift block-piston connection, the patent eliminates intermediate transmission components that add weight. The cam mechanism efficiently transmits force with minimal component mass, reducing overall tool weight.
3Force
If a motor with gear reducer or gear assembly is used to drive the hydraulic pump, then the tool can provide high force output, but the tool becomes cumbersome for operator use
Solution Approach 1:
The patent extracts the bulky gear assembly and gear reducer, resulting in a more compact and maneuverable tool. The simplified cam-driven mechanism reduces the tool's overall size and improves balance, making it easier for operators to handle and position during use.
Solution Approach 2:
By inverting the traditional drive architecture to use direct cam-lift block-piston connection, the patent creates a more compact mechanism with better weight distribution. This improved geometry and reduced component count enhance operator comfort and ease of operation.
4Power
If traditional hydraulic pump design is used, then the tool can provide hydraulic power, but the tool diameter increases
Solution Approach 1:
The patent inverts the traditional pump architecture by using a cam-driven lift block that directly actuates the piston axially. This configuration allows the pump components to be arranged in a more compact radial space, reducing the overall tool diameter while maintaining hydraulic power output capability.
Solution Approach 2:
The patent utilizes the axial dimension more effectively by employing a lift block that moves axially to drive the piston, rather than using traditional radial piston arrangements. This dimensional reorganization allows for a more compact radial footprint, reducing tool diameter.
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 design results in a lighter, more user-friendly hydraulic tool with reduced size and improved efficiency, enabling high force applications while minimizing piston wear and tool diameter.
Implementation Method 1
a motor having a gearbox rotating a camshaft. The balanced pump-axial pump also comprises ball followers configured to move radially outwards when the camshaft rotates
Implementation Method 2
The balanced pump-axial piston pump also comprises a spring, wherein the spring pushes the piston
Implementation Method 3
the piston moves linearly in a piston chamber pumping oil and providing hydraulic power
Data Source
AI summary
A balanced pump-axial piston pump for a hydraulic tool. The balanced pump-axial piston pump includes a camshaft, cam followers, a lift block, a spring, a pump piston, a piston chamber, and a manifold. Rotation of the camshaft drives radial movement of the cam followers at the same time. The radial movement of the cam followers make the lift block move linearly along the axis of the hydraulic tool. The spring pushes the piston against the lift block so that the piston is kept in contact with the lift block. The linear movement of the lift block moves the piston linearly in the piston chamber, thereby pumping oil and providing hydraulic power.