Transmission Device Pinion Retaining Element Design
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Solution Overview
Problem
The assembly of rack and pinion gear devices attached to drive shafts is complex and time-consuming due to the need for precise alignment and secure fixation of components.
Innovation Solution
A transmission device design featuring a base body with flexible legs and a holding element that allows easy assembly by snapping the pinion onto the base body, with a two-part pinion design and a ring-like holding member that encloses the drive shaft, simplifying the attachment process and ensuring secure positioning without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rack and pinion gear devices are assembled on drive shafts, then secure fixation and precise alignment are achieved, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The base body integrates multiple functions: it serves as the mounting structure for the pinion, provides the retaining element for axial fixation, and includes bearing surfaces for the drive shaft. This merging of functions into a single component eliminates the need for separate alignment and fixation operations, resolving the contradiction between secure fixation and assembly complexity
Solution Approach 2:
The base body is pre-configured with the retaining element and bearing surfaces during manufacturing. This preliminary preparation allows the pinion and drive shaft to be installed directly without requiring separate alignment or fixation steps during assembly, thereby reducing assembly complexity while maintaining secure fixation
2Stability of the object's composition
If multiple components are used to fix the pinion on the base body, then secure positioning is achieved, but the assembly process becomes more complex
Solution Approach 1:
The retaining element is integrated directly into the base body as a unified structure rather than being a separate component. This merging ensures stable pinion positioning through the retaining element's geometric constraint while eliminating additional parts, thus resolving the contradiction between positioning stability and component complexity
Solution Approach 2:
The retaining element is designed to automatically engage with the pinion upon assembly, providing self-positioning and self-fixation functionality. This self-service mechanism ensures stable positioning without requiring additional fasteners or adjustment operations, reducing component complexity while maintaining positioning stability
3Strength
If the base body is closed on all sides, then structural strength is improved, but assembly on existing drive shafts becomes difficult
Solution Approach 1:
The base body is designed with an opening in its structure, segmenting the otherwise closed form. This segmentation allows the base body to be slid onto existing drive shafts during assembly while the overall structure maintains sufficient strength through the configuration of legs and webs, resolving the contradiction between strength and assembly ease
Solution Approach 2:
The base body transitions from a closed rigid structure to an open structure with flexible legs that can bend during assembly. This dynamic characteristic allows the base body to adapt to the drive shaft during installation, facilitating easy assembly while the rigid legs and webs provide structural strength once assembled
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
This design significantly simplifies the assembly process by allowing easy alignment and secure fixation of the pinion on the base body, preventing the pinion from disassembly and enabling smooth rotation of the drive shaft, thus enhancing the overall assembly efficiency and stability of the transmission device.
Implementation Method 1
At least one leg of the base body is flexible enough to move towards or away from the adjacent second leg of the base body, e.g., to bend
Data Source
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AI summary
The invention relates to a transmission device for attaching to a driveshaft, comprising a main body at least partially surrounding the driveshaft, a pinion arranged on the driveshaft in the assembled state, and a rack which cooperates with the pinion in the assembled state on the main body and passes through the main body, wherein the main body is open on one side in such a way that it can be slid onto a driveshaft in the radial direction. The transmission device is characterised in that the main body comprises a retaining element, wherein the retaining element is configured such that the pinion, when arranged on the main body, is fixed in a position relative to the main body, without further components.