Dual PTO Transmission Layout for Compact Work Vehicles
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Solution Overview
Problem
Existing work vehicles lack a mechanism to change the rotation speeds of rear and mid PTO shafts independently without altering the engine speed, leading to potential fluctuations in vehicle speed and torque, which can affect performance, especially in small-sized vehicles where space constraints limit the installation of transmissions.
Innovation Solution
Incorporating an output transmission system positioned closer to the prime mover than the branch point between the rear and mid PTO shafts, allowing for independent speed changes of the rear and mid PTO shafts, along with a control unit and display units to manage and indicate the rotation speeds, ensuring safe operation and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmission is installed in the rear portion of the traveling vehicle body to change rotation speeds of PTO shafts, then the rotation speeds can be changed, but the space utilization is poor and the device complexity increases
Solution Approach 1:
The patent relocates the transmission from the traditional rear portion of the vehicle body to the engine room, utilizing unused spatial resources in a different dimension (engine compartment space). This allows the transmission to be integrated into the existing engine room layout, sharing space with other components, thereby achieving rotation speed change capability without increasing overall device complexity or requiring additional rear space.
2Speed
If the engine rotation speed is changed to adjust PTO shaft rotation speeds, then the PTO shaft speeds can be adjusted, but the vehicle speed fluctuates and the torque becomes insufficient
Solution Approach 1:
The patent separates the control of PTO shaft rotation speed from the control of vehicle traveling speed by introducing an independent transmission system. This transmission is specifically dedicated to adjusting PTO shaft speeds through gear changes, while the engine speed remains constant, thereby maintaining stable vehicle traveling performance. The segmentation allows independent optimization of both functions without mutual interference.
Solution Approach 2:
The transmission acts as an intermediary mechanism between the engine and the PTO shafts. Instead of directly changing engine speed to adjust PTO shaft speeds, the transmission provides a mechanical intermediary that can change output speeds through gear ratios while keeping the engine speed constant. This intermediary function protects the stability of vehicle traveling performance while achieving the desired PTO shaft speed adjustment.
3Device complexity
If no transmission is provided for PTO shafts, then the device complexity is reduced, but the rotation speeds of PTO shafts cannot be changed
Solution Approach 1:
The transmission installed in the engine room serves multiple functions: it changes the rotation speeds of both the rear PTO shaft and the mid PTO shaft, and can be integrated with the existing vehicle power transmission system. By making the transmission multi-functional, the patent achieves rotation speed adjustment capability for multiple PTO shafts without proportionally increasing device complexity, as a single transmission unit handles multiple speed change requirements.
Data Source
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AI summary
The invention is to make it possible to effectively utilize a space and change a rotation speed of an output shaft. A work vehicle (1) includes a first output shaft (141) configured to output power of an engine (E), a second output shaft (146) configured to output the power of the engine (E) to a position different from that of the first output shaft (141), and an output transmission (132) disposed closer to the engine (E) than a branch position (142) between the first output shaft (141) and the second output shaft (146). As compared with a case in which the output transmission (132) is disposed in a rear portion of a traveling vehicle body (1a) having many space limitations, a space can be effectively utilized and a rotation speed of an output shaft can be changed.