Self-Aligning Driveshaft Coupler for Tractor PTO
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Solution Overview
Problem
Coupling a tractor power take off (PTO) to the driveline of a rear-mounted implement is time-consuming, difficult, and requires manual alignment, posing safety concerns and alignment challenges without external energy sources like electricity, hydraulics, or pneumatics.
Innovation Solution
A self-aligning driveshaft coupler with a receiving clutch featuring a spiral channel and locking clutch assembly, which uses drive pins and a locking pin to automatically align and secure the PTO to the implement shaft without external energy, ensuring ease of use and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual alignment and coupling methods are used, then the coupling process can be completed without external energy sources, but the operation becomes time-consuming and difficult
Solution Approach 1:
The spiral channel is pre-formed in the receiving clutch, and the locking pin is pre-positioned in the locking clutch assembly. When the locking clutch assembly is engaged with the receiving clutch, the locking pin automatically follows the spiral channel path, achieving self-alignment and engagement without requiring manual positioning or external energy sources.
Solution Approach 2:
The coupling mechanism is designed to be self-aligning and self-securing. The locking pin automatically follows the spiral channel and engages the locking feature when the locking clutch assembly is brought into engagement with the receiving clutch, eliminating the need for manual alignment operations or external power sources.
2Reliability
If traditional splines and keepers are used, then rotational power can be transmitted, but correct alignment between the PTO and implement shaft is difficult to achieve
Solution Approach 1:
The spiral channel provides a curved, guiding path for the locking pin. This spiral geometry allows the locking pin to be drawn into proper alignment with the receiving clutch features as the locking clutch assembly engages, automatically achieving correct orientation without manual intervention.
Solution Approach 2:
The locking pin acts as an intermediary element between the locking clutch assembly and the receiving clutch. It follows the spiral channel path and engages the locking feature, mediating the alignment process and ensuring proper engagement between the two clutch components.
3Reliability
If manual manipulation of locking features is required, then the coupling can be secured, but the operator must hold back the locking feature while positioning the driveline
Solution Approach 1:
The locking mechanism is designed to secure itself automatically. When the locking clutch assembly engages with the receiving clutch, the locking pin is drawn along the spiral channel and automatically engages the locking feature, eliminating the need for the operator to manually hold back or manipulate locking components during positioning.
Solution Approach 2:
The spiral channel is pre-configured to guide the locking pin into the correct position. As the locking clutch assembly approaches the receiving clutch, the locking pin automatically follows the predetermined spiral path and engages the locking feature in advance, securing the coupling without requiring ongoing manual manipulation.
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
The self-aligning driveshaft coupler simplifies and enhances the coupling process, ensuring operator safety and compatibility with standard PTO driveshafts and implements, eliminating the need for external energy sources.
Implementation Method 1
An inwardly extending locking pin enters and follows the spiral channel and pulls the locking clutch assembly axially toward the base as the receiving clutch rotates
Implementation Method 2
a plurality of drive pins that enter the receiving holes to rotatably engage the locking clutch assembly to the receiving clutch
Data Source
AI summary
A self-aligning driveshaft coupler includes a receiving clutch mounted to a driveshaft and a locking clutch assembly mounted to an implement. The locking clutch assembly includes a collar and a yoke that rotate together, and a spring between the collar and the yoke. A locking pin may be pivotably attached to the yoke to move a projection on the locking pin in and out of the retaining groove. A plurality of drive pins extend axially from the collar. The spring biases the drive pins into engagement with the receiving clutch when the locking pin projection is in the retaining groove and the output shaft and receiving clutch are rotated less than 180 degrees.