Split Transmission Housing With Elastic Web Preload for Bore Stability
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Solution Overview
Problem
Existing transmission housing designs face challenges in maintaining tightness and simplicity of production while allowing for a divided housing configuration that supports small axle spacing and high torque transmission.
Innovation Solution
A transmission housing design featuring a lower and upper housing part with elastic deformation, where a first web projects beyond a planar separating surface to ensure tightness without inelastic deformation, allowing for easy machining and assembly with bearing bores that remain unchanged during connection and disconnection, enabling high contact pressure and small axis clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is divided into upper and lower parts with webs pressed against each other for tightness, then the tightness is improved, but the production complexity increases due to the need for elastic deformation and precise geometry control
Solution Approach 1:
The housing parts are pre-deformed during production to create the necessary elastic distortion before final assembly. This preliminary action ensures that when the housing parts are connected, the webs are already in the correct deformed state to provide tightness without requiring additional deformation steps during assembly
Solution Approach 2:
The invention utilizes elastic deformation parameters by designing the housing geometry to allow controlled elastic distortion of the webs. By changing the physical state of the material through elastic deformation and then utilizing stress relaxation, the patent achieves tight connection without permanent deformation or complex fastening mechanisms
2Reliability
If the first web is pressed against the corresponding web by screws to ensure tightness, then the tightness is improved, but the device complexity increases due to additional fastening components
Solution Approach 1:
The invention extracts and eliminates the screws from the connection mechanism. Instead of using screw fasteners to press the webs against each other, the patent relies solely on the elastic deformation and stress relaxation of the housing parts themselves to provide the necessary contact pressure and tightness
Solution Approach 2:
The housing parts perform the tightening function themselves through their own elastic deformation. The first web of one housing part projects beyond the separating surface and presses against the corresponding web of the other housing part automatically when the parts are connected, without requiring external fastening components
3Ease of manufacture
If bearing bores are introduced before connecting the housing parts, then the production process is simplified, but the bearing bore geometry becomes distorted due to elastic deformation during connection
Solution Approach 1:
The bearing bores are introduced into the housing parts while they are in the deformed state, before final connection. This preliminary action ensures that the bores are created with the correct geometry taking into account the elastic distortion that will be present during operation, preventing distortion after assembly
Solution Approach 2:
Instead of introducing bearing bores into the connected housing and then deforming it, the invention inverts the sequence by introducing the bores into the separated, deformed housing parts first. This reversal of the normal sequence allows the bores to be created with precise geometry that accounts for the elastic deformation
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 design achieves high tightness and simplicity in production with minimal deformation of bearing bores, allowing for efficient assembly and disassembly without altering the geometry, enabling high torque transmission with small axle spacing.
Implementation Method 1
The housing parts have an elastic distortion or deformation such that when the two housing parts are separated and/or pulled apart, that is to say, in an elastic stress relaxation
Data Source
AI summary
A transmission includes a housing, having lower and upper housing parts, and having bearing seats. A web is formed on the lower housing part between two bearing seats in each case, which is pressed against a web provided on the upper housing part and between the respective bearing seats. The housing parts have an elastic distortion or deformation such that when the two housing parts are separated or pulled apart, or in other words, in an elastic relaxation, in particular, a first web of the webs of a first of the two housing parts projects beyond a planar surface, in particular beyond a separating surface, which restricts the other webs of the first housing part, or the webs of one of the housing parts is restricted by a planar separating surface, and with the exception of a first web, the webs of the other housing part are also restricted by the planar separating surface and the first web projects beyond the separating surface when the housing parts are separated from each other so that in order to form the housing of interconnected housing parts, at least one of the housing parts is elastically deformed and/or preloaded.