Compression Spring Stop Bolt Tilt Mechanism
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Solution Overview
Problem
Existing compression springs with overload protection require excessive space, weight, and production costs due to complex shapes and large material usage, limiting adaptability to different applications.
Innovation Solution
A compression spring design featuring a hemispherically convex stop bolt on the base plate and a correspondingly concave receiving trough, allowing the stop bolt to tilt under shear load, eliminating the need for complex counter-support surfaces and enabling efficient overload protection with adjustable cone angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stop webs are formed on the edges of base plate and pressure plate to provide overload protection, then overload protection function is achieved, but the compression spring takes up excessive space, requires complex shapes, and increases weight and production costs
Solution Approach 1:
The stop function is extracted from the edge regions and concentrated into a single stop bolt element positioned centrally within the elastomer body. This removes the need for extensive stop webs at the edges, thereby reducing the overall space occupied by the compression spring while maintaining the overload protection function.
Solution Approach 2:
The stop bolt combines multiple functions into a single element: it serves as both the overload protection mechanism and the structural connector between base plate and pressure plate. This merging eliminates the need for separate stop webs and complex edge formations, reducing both space requirements and manufacturing complexity.
2Reliability
If stop webs are formed on the edges of base plate and pressure plate to provide overload protection, then overload protection function is achieved, but production costs and weight increase due to complex shapes and large material usage
Solution Approach 1:
The stop function is extracted from the edge regions and concentrated into a single stop bolt element positioned centrally within the elastomer body. This removes the need for extensive stop webs at the edges, thereby reducing the overall space occupied by the compression spring while maintaining the overload protection function.
Solution Approach 2:
The stop bolt is designed as a simple, standardized component that can be easily manufactured and replaced if needed. This approach uses less material than complex stop webs while achieving the same protective function, thereby reducing both weight and production costs.
3Reliability
If stop webs are formed on the edges of base plate and pressure plate to provide overload protection, then overload protection function is achieved, but adaptations to different applications are difficult and require significant effort
Solution Approach 1:
The stop bolt is designed as a universal component that can be applied to various compression spring configurations. By positioning the stop bolt centrally within the elastomer body rather than forming it into specific edge shapes, the same basic design can be adapted to different applications by simply adjusting parameters like bolt length or elastomer dimensions, rather than redesigning complex stop web geometries.
Solution Approach 2:
The invention allows for easy adaptation to different applications by changing parameters such as the stop bolt length, diameter, or the distance between base plate and pressure plate, rather than requiring fundamental redesigns of complex stop web structures. This makes the design highly adaptable to various load requirements and space constraints.
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 reduces space, weight, and production costs while providing effective overload protection, allowing for simple adaptations to various applications by varying the cone angle and ensuring reliable frictional engagement between the stop bolt and elastomer body.
Implementation Method 1
An elastomer body is vulcanized in as a rubber body with intermediate sheets between the base plate and the pressure plate
Implementation Method 2
the pressure plate can have a stable plate part with an elastomer coating, preferably as a vulcanized rubber layer, as a damping measure
Implementation Method 3
the stop bolt in the hemisphere area can tilt under shear stress until it rests against a cone wall of the cone area for overload protection
Data Source
AI summary
The invention relates to a compression spring with overload protection, in particular between a leaf spring end (7) and an axle body (4) of a truck, comprising a stable base plate (2) and a stable pressure plate (8) spaced apart therefrom, with an elastomer body (6) firmly attached between them, and with at least one stop element which limits the free spring travel as overload protection. According to the invention, the stop element is a stop bolt (18) integrated into the elastomer body (6). The stop bolt (18) rests with a bolt end (19) on the base plate side in a receiving recess (15) of the base plate (2). Furthermore, the stop bolt (18) is received in an elastomer body receiving space (13) and runs approximately perpendicularly between the base plate (2) and the pressure plate (8).The elastomer body receiving chamber (13) is connected to a pressure plate through-bore (12) into which the stop bolt (18) with a free stop bolt end (21) already projects in the unloaded compression spring state and/or after a predetermined free compression spring travel and further supports itself as overload protection on a component resting on the pressure plate (8) with pressure (arrow 22), in particular on a leaf spring end (7), when subjected to a predetermined pressure load.