PTO Shaft Detection Sensor for Work Vehicle Gear Shifting
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Solution Overview
Problem
Conventional work vehicles with PTO gear shift devices are prone to unreliable gear-shifting due to mechanical components being affected by mud and debris, leading to incorrect rotational speed settings.
Innovation Solution
A work vehicle equipped with two types of PTO shafts, a gear shift mechanism, a storage unit, a PTO shaft detection sensor, and a control device that ensures reliable gear-shifting by detecting the type and state of the PTO shafts, preventing incorrect rotational speeds through electrical detection and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical cam is used to lock the PTO gear-shifting, then the gear-shifting can be mechanically locked on a high-speed position, but the cam is likely not to be pivoted if mud and debris are accumulated on the vicinity of the cam
Solution Approach 1:
The patent replaces the mechanical cam-based locking system with an electrical control system. A detection sensor detects whether a low-speed rotation PTO shaft is stored in the storage unit, and this detection signal electrically controls the PTO gear-shifting lock mechanism, eliminating the need for mechanical cam pivoting that was susceptible to mud and debris accumulation.
2Reliability
If a detection sensor is added to detect PTO shaft type, then the control device can reliably determine the correct gear-shifting position, but the device complexity increases
Solution Approach 1:
The patent introduces a detection sensor and control device that use electrical signals to identify PTO shaft types and control gear-shifting positions, replacing complex mechanical detection and locking mechanisms with simpler electrical control systems.
Data Source
AI summary
A work vehicle includes two types of PTO shafts, a PTO drive unit, a storage unit, a PTO gear shift operation unit, a PTO shaft detection sensor, a PTO gear shift sensor and a control device. The storage unit stores a PTO shaft, which is not connected to the driven portion, of the two types of PTO shafts. The PTO gear shift operation unit performs gear-shifting of the gear shift mechanism. The PTO shaft detection sensor detects a type of the PTO shaft stored in the storage unit. The PTO gear shift sensor detects an operation state of the PTO gear shift operation unit. The control device decides a propriety of a combination of a detection value of the PTO shaft detection sensor and a detection value of the PTO gear shift sensor.