Planetary Transmission Speed Change Apparatus for Tractors
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Solution Overview
Problem
Existing speed change transmission apparatuses for tractors are economically disadvantageous due to the need for diversifying designs to accommodate various demand requirements, including the ability to switch between low and high speed modes, and often result in complex manufacturing models with interlocked components.
Innovation Solution
A speed change transmission apparatus featuring a planetary transmission device, a speed range setting device with hydraulic clutches, and a forward-reverse changeover device, where the planetary transmission device, speed range setting device, and forward-reverse changeover device are coaxially disposed, allowing for separate auxiliary speed change devices and compact hydraulic circuits, enabling efficient switching between speed modes and directions without interlocking all components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing speed change transmission apparatuses include interlocked components and complex manufacturing models to accommodate various demand requirements, then adaptability is improved, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The transmission apparatus is divided into independent functional modules: planetary transmission device, speed range setting device, and forward-reverse changeover device. Each module operates independently without requiring interlocking components, simplifying the overall structure while maintaining adaptability through modular combinations.
Solution Approach 2:
The planetary transmission device serves multiple functions by combining engine drive and stepless speed change device outputs through planetary mechanisms. The same device can operate in different speed ranges and modes without requiring separate dedicated components for each function.
2Adaptability or versatility
If existing speed change transmission apparatuses use interlocked components to achieve speed mode switching, then speed range setting is improved, but device complexity increases
Solution Approach 1:
Speed range switching is achieved through independent clutch mechanisms (first clutch and second clutch) that engage different planetary transmission paths without requiring complex interlocking. The forward-reverse changeover device similarly operates independently, simplifying the speed control system.
Solution Approach 2:
The control device acts as an intermediary that coordinates clutch engagement and planetary mechanism operation to achieve smooth speed range transitions. This centralized control simplifies the coordination that would otherwise require complex mechanical interlocks.
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 design allows for a more versatile and cost-effective speed change transmission system that can operate at high torque and speed, with smooth speed changes and reduced transmission loss, while enabling easy switching between forward and reverse travel.
Implementation Method 1
a planetary transmission device for, by a plurality of planetary transmission mechanisms, combining an output from a stepless speed change device and the engine drive not subject to a speed change by the stepless speed change device
Implementation Method 2
a speed range setting device for receiving the drive combined by the planetary transmission device and producing a first speed range and a second speed range, the speed range setting device including a first clutch and a second clutch
Data Source
AI summary
Disclosed is an apparatus including a stepless speed change device receiving an engine drive; a planetary transmission device for, by a plurality of planetary transmission mechanisms, combining an output from the stepless speed change device and the engine drive not subject to a speed change by the stepless speed change device; and a speed range setting device for outputting the drive combined by the planetary transmission device and divided into a plurality of speed ranges. The planetary transmission device, the speed range setting device and a forward-reverse changeover device are located forwardly of a rear end of an upstream transmission case portion. An electric motor may be used instead of the stepless speed change device.