Transmission Casing Assembly With Self-Activating Output Shaft Retention
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Solution Overview
Problem
Existing transmission boxes require the output shaft to be mounted in the open state, leading to increased space requirements during storage, and existing solutions for mounting the shaft in the closed state necessitate additional parts to prevent axial displacement, complicating the process and increasing the risk of errors.
Innovation Solution
A transmission box design with a device that can be activated in the closed state to limit axial displacement of the output shaft, using a mechanism that switches from an inactive to an active state based on the shaft's position, allowing simplified mounting without additional parts and reducing the risk of errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the output shaft is mounted in the open state of the box, then the mounting process is simple, but the space requirement during storage increases
Solution Approach 1:
The device for limiting axial displacement is pre-configured inside the closed box before the output shaft is inserted. The protrusion element is already positioned within the box, ready to engage with the output shaft upon insertion, eliminating the need for additional mounting steps after shaft installation.
Solution Approach 2:
The device for limiting axial displacement is nested inside the box structure itself. The protrusion element is housed within the box and engages with the output shaft during insertion, allowing the limiting function to be integrated into the box rather than requiring separate external components.
2Reliability
If additional parts are used to limit axial displacement of the output shaft, then the shaft position is controlled, but the device complexity increases
Solution Approach 1:
The function of limiting axial displacement is merged with the box structure itself. The protrusion element is an integral part of the box or its internal components, combining the positioning function with the existing box structure rather than requiring separate dedicated limiting devices.
Solution Approach 2:
The protrusion element serves multiple functions: it guides the output shaft during insertion, limits axial displacement in both directions, and maintains proper shaft positioning during operation. This single element performs what would traditionally require multiple separate components.
3Reliability
If additional parts are used to limit axial displacement, then the shaft position is controlled, but the risk of mounting errors increases
Solution Approach 1:
The device for limiting axial displacement activates automatically through the insertion motion itself. As the output shaft is inserted into the box, the protrusion element naturally engages with the shaft, self-activating the limiting function without requiring the operator to perform additional actions or install separate components.
Solution Approach 2:
The limiting mechanism is pre-positioned inside the box before the output shaft is inserted. The protrusion element is already in place, ready to engage with the shaft during insertion, eliminating the need for post-installation adjustments or additional mounting steps that could introduce errors.
4Volume of stationary object
If the device for limiting axial displacement is activated in the closed state, then the space requirement is reduced, but the activation mechanism becomes more complex
Solution Approach 1:
The activation of the limiting device is achieved through the self-service mechanism of the insertion motion itself. As the output shaft is pushed into the box, the relative motion between the shaft and the protrusion element automatically activates the limiting function, requiring no separate activation mechanism.
Solution Approach 2:
Instead of activating the limiting device through a separate mechanism or additional components, the invention inverts the approach by using the insertion motion itself as the activation mechanism. The limiting function is triggered by the natural movement of installing the shaft, rather than requiring a dedicated activation system.
Data Source
AI summary
Transmission box (1) comprising an output shaft (5) made of a single piece or at least two shaft sections (5A, 5B), said shaft being insertable into the box (2) in the closed state of the box (2) through at least one (3) of the openings (3, 4) referred to as the insertion opening (3) in the box (2), the box (1) further comprising at least one device (8) for limiting the axial displacement of the output shaft (5) or the output shaft section (5A; 5B), this axial displacement limitation device (8) can be activated to pass from an inactive state to an active state in which any axial displacement of the output shaft (5) or of the output shaft section (5A; 5B) inside the box (1) according to at least one direction opposite to the direction of insertion of the output shaft (5) or the output shaft section into the box (1) is limited or prevented is a device (8) that can be activated in the closed state of the box (1) and is configured to, in the closed state of the box (1), to pass from an inactive state to an active state depending on the position occupied by the output shaft (5) or the output shaft section (5A; 5B) in said box (1) by simple displacement of the output shaft (5) or the output shaft section (5A; 5B) from the or at least one of the insertion openings (3) in the box (1) in the direction of the inside of the box (1).