Hydrodynamic Tool Two-Speed Pump and Friction Reduction Mechanism
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Solution Overview
Problem
Hydrodynamic tools used for compression and cutting operations in tight spaces and outdoors require reduced energy consumption, smaller size, and faster work cycles, but existing two-speed systems are complex, bulky, and suffer from energy losses due to sliding friction in transformation mechanisms.
Innovation Solution
A hydrodynamic tool with a two-speed hydraulic pump featuring an auxiliary piston and elastic coupling, allowing for high flow rate at low pressure for quick jaw movement and low flow rate at high pressure for pressing/cutting, along with a transformation mechanism that reduces sliding friction using a thrusting group with rolling members and a cam track to transmit motion without rotation, minimizing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-speed hydrodynamic group is used to achieve high flow rate for quick jaw movement and low flow rate for high pressure operations, then the work cycle speed is improved, but the device complexity and bulk increase due to requiring multiple ducts, valves, and cylinder-piston groups
Solution Approach 1:
The patent merges the high-flow and low-flow pumping functions into a single hydrodynamic group with one cylinder-piston assembly. The single pump achieves two-speed operation by varying the pumping speed according to the reaction force detected during the operation cycle, eliminating the need for separate ducts, valves, and piston groups for each speed mode.
Solution Approach 2:
The patent implements dynamic speed adjustment within the single hydrodynamic group. The pumping speed is automatically varied during operation based on the detected reaction force - operating at high speed during approach and at reduced speed during the high-pressure compression or cutting phase, allowing one component to perform multiple speed functions.
2Ease of operation
If a transformation mechanism with sliding friction is used to transform rotary motion into oscillating translation motion, then the motion transformation is achieved, but energy losses increase due to sliding friction and component wearing
Solution Approach 1:
The patent replaces the traditional mechanical transformation mechanism with direct hydraulic actuation. The hydrodynamic group generates oscillating translation motion of the jaw through hydraulic pressure changes in the fluid, eliminating the need for separate mechanical transformation components that would involve sliding friction and wear.
Solution Approach 2:
The patent uses hydraulic principles to directly produce the oscillating translation motion. The single-acting piston in the hydrodynamic group moves the jaw back and forth through fluid pressure changes, converting the rotary motion of the drive shaft into linear oscillating motion hydraulically rather than through mechanical linkages with sliding contacts.
3Volume of moving object
If the tool is designed with small bulk and elongated shape for access to tight spaces, then the ease of access is improved, but the integration of battery and hydrodynamic components becomes more difficult
Solution Approach 1:
The patent merges multiple functions into compact integrated assemblies. The hydrodynamic group combines the pump, piston, and jaw actuation mechanisms in a single compact unit. The battery is integrated directly into the tool housing with optimized placement to minimize overall volume while maintaining all necessary functions.
Solution Approach 2:
The patent employs nested arrangement of components to reduce overall tool volume. The hydrodynamic group components are arranged concentrically and in nested configurations - the piston moves within the pump chamber, and the jaw mechanism is integrated within the same housing space, maximizing space utilization in the elongated tool form factor.
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 solution enables faster work cycles, reduced energy consumption, and a more compact design with lower energy losses, achieving the goals of speed, efficiency, and reduced bulk while maintaining high pressure for effective operations.
Implementation Method 1
an auxiliary piston (25) received in the pumping cylinder (18) and fixedly connected to the translatable body (10) through the interposition of a switching spring (26) with elastic preload
Implementation Method 2
a hydraulic pump connected to the transformation mechanism and suitable for carrying out an increase in pressure of a hydraulic liquid acting on an actuation piston (12) in response to the oscillating translation movement
Implementation Method 3
a return spring arranged between the actuation piston and the fixed jaw and acting elastically on the mobile jaw so as to return it, at the end of a stroke, to an initial position
Data Source
Figure 1
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Figure 4
AI summary
A hydrodynamic compression and/or cutting tool (1 ) comprises an electric motor (6), a transformation mechanism (8) suitable for transforming the rotary motion of the motor (6) into an oscillating translation motion, a two-speed hydraulic pump (1 1 ) suitable for carrying out an increase in pressure of a pressure fluid acting on an actuation piston (12) in response to the oscillating translation movement so as to move the actuation piston (12).