Front Drive Shaft Layout for CV Joint Assembly Error Absorption
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Solution Overview
Problem
Existing working vehicles face challenges in achieving space saving while effectively absorbing assembly errors of constant velocity joints, particularly in tractors with universal joints on the front wheel drive shaft.
Innovation Solution
A working vehicle design that includes a machine body frame, a front axle case, a suspension device, and a drive transmission shaft with a first, second, and third shaft connected by a constant velocity joint and a spline structure, allowing relative movement and assembly error absorption, and a cover to prevent foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two universal joints are provided on the front wheel drive shaft to absorb assembly errors, then assembly error absorption is improved, but space saving is worsened due to increased component count and complexity
Solution Approach 1:
The drive shaft is divided into multiple segments (first drive shaft, second drive shaft, third drive shaft) connected by constant velocity joints. This segmentation allows each segment to be positioned with tolerances while the constant velocity joints accommodate the cumulative assembly errors through their inherent flexibility, eliminating the need for additional universal joints.
Solution Approach 2:
The constant velocity joint serves multiple functions: it transmits power between shafts at different angles, accommodates assembly errors through its flexible connection, and maintains constant velocity transmission. This multi-functionality replaces the need for separate error-absorption mechanisms, achieving space saving while maintaining assembly error tolerance.
2Manufacturing precision
If two universal joints are provided on the front wheel drive shaft to absorb assembly errors, then assembly error absorption is improved, but device complexity is worsened
Solution Approach 1:
The power transmission function and assembly error absorption function are merged into the constant velocity joint connection system. The constant velocity joints inherently accommodate assembly errors while performing power transmission, eliminating the need for separate universal joints dedicated to error absorption, thus reducing overall device complexity.
Solution Approach 2:
The constant velocity joint is designed to simultaneously perform power transmission and accommodate assembly misalignments. This universal functionality reduces the total number of components needed compared to using multiple specialized joints, simplifying the overall drive shaft system.
Data Source
AI summary
A working vehicle includes a machine body frame, a front axle case, a suspension device, a first shaft that is disposed in a lower portion of a clutch housing and to which a driving force transmitted from an engine through a transmission shift device is transmitted, a second shaft to which a driving force from the first shaft is transmitted, a third shaft that transmits a driving force transmitted from the second shaft to an axle, a constant velocity joint that bendably connects a front end side of the second shaft and a rear end side of the third shaft at a position corresponding to a rocking shaft, and a connection portion (spline portion) that connects a rear end side of the second shaft and a front end side of the first shaft so as to allow relative movement of the second shaft and the first shaft in an axial direction.