Planetary Transmission Backup Drive for HST Abnormality
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Solution Overview
Problem
When abnormality occurs in the hydrostatic transmission (HST) of a transmission apparatus, the work vehicle becomes unable to travel, requiring significant effort to move, and changing the basic configuration to allow power transmission is costly and difficult.
Innovation Solution
A transmission apparatus incorporating a hydrostatic transmission, planetary gear mechanism, input-side power transmission mechanism, and a controller to transmit power to drive wheels even when the HST is abnormal, maintaining the basic configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the basic configuration of the transmission apparatus is significantly changed to allow power transmission when HST is abnormal, then power transmission capability is improved, but cost and difficulty of mounting increase
Solution Approach 1:
The planetary gear mechanism is designed to serve dual functions: normally combining power from both the engine and HST for optimal performance, and alternatively transmitting power directly from the engine to the drive wheels when the HST is abnormal. This multi-functionality allows the same hardware to handle both operational modes without requiring separate dedicated systems for each function.
Solution Approach 2:
The clutch mechanism acts as an intermediary component that mediates between the engine and the planetary gear mechanism. By controlling the engagement and disengagement of the clutch, the system can selectively route power flow to achieve either normal combined power transmission or abnormality-mode direct power transmission, enabling flexible response to different operational conditions without permanent configuration changes.
2Reliability
If the basic configuration is changed to transmit power when HST is abnormal, then vehicle mobility is improved, but cost increases
Solution Approach 1:
The existing planetary gear mechanism and clutch assembly are utilized for dual purposes: normal power combination and emergency power transmission. This eliminates the need to manufacture separate dedicated emergency power transmission components, thereby avoiding additional manufacturing costs while ensuring vehicle mobility during HST abnormality.
Solution Approach 2:
The transmission apparatus uses its own existing components (planetary gear mechanism, clutch, input-side power transmission mechanism) to provide the emergency power transmission function. Rather than requiring external or additional specialized components, the system leverages its inherent structure to maintain mobility, thereby avoiding extra manufacturing expenses.
3Reliability
If the basic configuration is changed to transmit power when HST is abnormal, then vehicle mobility is improved, but difficulty of mounting increases
Solution Approach 1:
The planetary gear mechanism is designed to serve dual functions: normally combining power from both the engine and HST for optimal performance, and alternatively transmitting power directly from the engine to the drive wheels when the HST is abnormal. This multi-functionality allows the same hardware to handle both operational modes without requiring separate dedicated systems for each function.
Solution Approach 2:
The clutch mechanism acts as an intermediary component that mediates between the engine and the planetary gear mechanism. By controlling the engagement and disengagement of the clutch, the system can selectively route power flow to achieve either normal combined power transmission or abnormality-mode direct power transmission, enabling flexible response to different operational conditions without permanent configuration changes.
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 power transmission to drive wheels during HST abnormalities without altering the basic configuration, ensuring vehicle mobility.
Implementation Method 1
a hydrostatic transmission that changes rotary power of an engine steplessly and output the changed power
Implementation Method 2
a planetary gear mechanism that combines the rotary power of the engine and rotary power output from the hydrostatic transmission and outputs resultant power to a drive wheel
Data Source
AI summary
[Problem] The present invention provides a transmission apparatus capable of transmitting power even when a hydrostatic transmission becomes abnormal, while keeping a basic configuration of the transmission apparatus. [Solution] The transmission apparatus includes: a hydrostatic transmission that changes rotary power of an engine steplessly to output; a planetary gear mechanism that combines the rotary power of the engine and rotary power output from the hydrostatic transmission and outputs resultant power to a drive wheel; an input-side power transmission mechanism capable of transmitting the rotary power of the engine to the hydrostatic transmission and the planetary gear mechanism; and a controller configured to transmit the power from the engine to the drive wheel via the input-side power transmission mechanism and the planetary gear mechanism when the hydrostatic transmission is abnormal.