Forestry Winch Cable Ejection via Hydraulic Differential Piston
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Solution Overview
Problem
Existing forestry cable winches require significant effort to extract the cable and often necessitate additional hydraulic or electric motors for mechanical ejection, increasing complexity and energy consumption.
Innovation Solution
A cable winch design incorporating a hydraulically actuated drum clutch, drum brake, and a rope ejection device with a friction clutch, eliminating the need for an additional drive unit by utilizing a hydraulic cylinder with differently sized piston surfaces to manage pressure distribution, allowing for efficient cable extraction without additional energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an additional hydraulic or electric motor is used for cable ejection, then mechanical cable extraction is enabled, but device complexity and energy consumption increase
Solution Approach 1:
The drive shaft is designed to serve dual functions: it drives the cable drum during normal operation and drives the cable pulley during cable ejection. By coupling the cable pulley directly to the drive shaft through a clutch mechanism, the system eliminates the need for a separate drive unit, reducing device complexity while maintaining cable extraction capability
Solution Approach 2:
The drive train merges the cable drum drive and cable pulley drive into a single integrated system. The clutch mechanism allows the drive shaft to selectively engage either the cable drum or the cable pulley, combining two functions into one drive unit and reducing overall system complexity
2Ease of operation
If a hydraulically actuated clutch is used for the rope ejection device, then cable extraction is simplified, but hydraulic system complexity increases
Solution Approach 1:
A single hydraulic cylinder with differently sized piston surfaces controls three distinct functions: the rope ejection clutch, the drum brake, and the drum clutch. By using differential piston areas, different hydraulic pressures are generated from the same hydraulic line, enabling multiple functions to be controlled by one hydraulic actuator, thus simplifying the hydraulic system
Solution Approach 2:
The hydraulic cylinder merges the control of the rope ejection clutch, drum brake, and drum clutch into a single actuator. The differential piston design allows one hydraulic pressure source to control multiple components, reducing the number of hydraulic valves and actuators needed
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
Enables effortless cable extraction over long lengths with reduced component count and energy requirements, providing a simpler and cost-effective solution for mechanical ejection while serving as an overload protection mechanism.
Implementation Method 1
a hydraulic cylinder (624) is provided to actuate the cable ejector clutch (62), which has two hydraulic connections (B, K), with the hydraulic connection (B) being connected to the drum brake (5) via a pressure line (10) and the hydraulic connection (K) being connected to the drum clutch (4) via a pressure line (9)
Implementation Method 2
The rope pulley of the rope ejection device is preferably designed as a friction wheel and interacts with at least one, preferably several, pressure rollers in such a way that the at least one pressure roller presses the rope onto the drivable rope pulley
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The winch according to the invention essentially comprises the following components: a. a drive shaft (1), b. a cable drum (2) for winding a cable (3), c. a drum clutch (4) for transmitting the rotary motion of the drive shaft to the cable drum, d. a drum brake (5) for braking the cable drum, and e. a cable payout device (6) with at least one driven cable pulley (60) for unwinding the cable, which is connected to the drive shaft via a drive train comprising a cable payout clutch (62). This drive train eliminates the need for an additional drive unit to control the cable pulley.