Forestry Winch Planetary Gear Coaxial Integration
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Solution Overview
Problem
Existing forestry winches face inefficiencies in power transmission from a tractor's cardan joint shaft to the winding drum, leading to increased dynamic stresses, vibrations, and reduced efficiency due to the offset position of the cardan joint shaft in two planes, which affects the stability and tensioning of towing cables.
Innovation Solution
A two-step planetary gear system is integrated within the winding drum, allowing coaxial arrangement of the transmission gear and winding drum, with a clutch and brake mechanism for efficient torque transmission, reducing mechanical stresses and vibrations by enabling the input shaft to be centered in a single plane, and allowing independent operation of a hydraulic pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-step reduction gear with cylindrical gears is used with the cardan joint shaft offset in two planes, then the winding drum can be positioned outside the casing, but the dynamic stresses and vibrations increase and power transmission efficiency decreases
Solution Approach 1:
The transmission gear is nested within the winding drum, with the planetary gear system housed inside the drum structure. This integration eliminates the need for offset positioning and allows coaxial arrangement of the input shaft and winding drum axis, reducing dynamic stresses and vibrations while maintaining manufacturing feasibility
Solution Approach 2:
The invention transitions from a two-plane offset configuration to a single-plane coaxial configuration by using planetary gearing. This dimensional reorganization of the power transmission path eliminates the harmful offset positions while maintaining the two-step reduction function
2Length of moving object
If a two-step reduction gear with cylindrical gears is used, then the winding drum diameter can be reduced, but the power transmission efficiency decreases due to offset shaft positioning
Solution Approach 1:
By nesting the planetary transmission gear within the winding drum, the design achieves both compact diameter and efficient power transmission. The coaxial arrangement eliminates energy losses associated with offset shafts while maintaining reduced drum dimensions
Solution Approach 2:
The invention replaces the traditional cylindrical gear system with a planetary gear mechanism. This substitution provides superior power transmission efficiency through direct coaxial coupling while achieving compact dimensions through the inherent space efficiency of planetary gearing
3Object-generated harmful factors
If the transmission gear is embedded within the winding drum, then the cardan joint shaft can be centered in a single plane, but the device complexity increases
Solution Approach 1:
The planetary transmission gear is nested within the winding drum structure, integrating two components into one. This nesting eliminates the offset cardan joint shaft issue while managing complexity through compact, space-efficient design
Solution Approach 2:
The invention merges the transmission gear housing with the winding drum structure, creating an integrated assembly. This combination eliminates the need for separate offset shaft arrangements while managing complexity through functional integration
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 configuration enhances power transmission efficiency, reduces mechanical stresses and vibrations, and ensures uniform towing force by centering the cardan joint shaft, while allowing for easier maintenance and assembly of the transmission gearbox as a separate assembly.
Implementation Method 1
a sun gear (811) mounted on a primary shaft (80') and by means of the last via said clutch (5) connectable with said input shaft (2) and moreover adapted to mesh with corresponding planet gears (812)
Implementation Method 2
said clutch (5) comprises at least a primary friction disc (5'), with which the input shaft (2) of the transmission gear is connected, and a secondary friction disc (5''), which is connected with said planetary gear (8)
Implementation Method 3
by activated brake the clutch is deactivated, by which rotation of the winding drum is blocked and at the same time the transmission of torque from the input shaft onto the winding drum is interrupted
Data Source
Figure 1
AI summary
The invention refers to a forestry winch, which is suitable for attachment to a tractor and by which a transmission of power from a tractor cardan joint shaft to a winding drum is arranged in such manner, that the efficiency is improved and machine parts are exposed to lower stresses, while the transmission gear (1) is integrated within said winding drum (3) as such. The winch according to the invention is further characterized in that said transmission gear (1) is a two-step planetary gear consisting of a first planetary assembly (81) and a secondary planetary assembly (82), which are. both- mounted within the- same easing (9). The planetary gearing (8) is on the one hand via a clutch (5) connected with an input shaft (2), which is connectable with said tractor cardan shaft, and on the other hand with the possibility of transmission of torque also with said winding drum (3), by which said casing (9) is at least partially surrounded, so that said casing (9) of the transmission gear (1) and the winding drum are arranged co-axially to each other, and simultaneously the winding drum (3) is allowed to rotate relative to the casing (9)·