Axial Piston Machine Housing Centering Without Assembly Stress
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Solution Overview
Problem
Existing centering and positioning methods for housing parts in axial piston machines with a swashplate design lead to stresses during assembly due to tolerance positions and pin bore drilling, requiring precise alignment that complicates manufacturing and assembly.
Innovation Solution
The use of fitting pins with precise recesses, including slotted holes and grooves, allows independent manufacturing of housing parts without stress, enabling easier assembly and cost savings by enlarging the housing opening and avoiding circular shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precise circular cylindrical centering collar and pin bores are used for centering housing parts, then alignment precision is improved, but manufacturing complexity and assembly stress increase
Solution Approach 1:
The centering function is segmented into two independent components: the first fitting pin provides radial centering, while the second fitting pin with slotted hole provides both centering and rotational adjustment. This segmentation allows each component to have a simplified structure while collectively achieving precise alignment without requiring complex circular cylindrical collars.
Solution Approach 2:
The second fitting recess is designed as a slotted hole that is adjustable in the radial direction, transforming a static precise fit into a dynamic adjustable connection. This allows the housing parts to be assembled without pre-aligned precision bores, reducing manufacturing complexity while maintaining alignment precision through post-assembly adjustment.
2Measurement precision
If precise pin bores are drilled in both housing parts for centering, then alignment accuracy is improved, but assembly stress and manufacturing difficulty increase
Solution Approach 1:
Instead of drilling precise pin bores in both housing parts and then forcing pins through them (which creates stress), the invention inverts the approach: the first pin fits precisely into precise recesses in both parts, while the second pin's recess in one housing part is a slotted hole that receives the pin without requiring precise pre-drilling. This inversion eliminates assembly stress while maintaining alignment accuracy.
Solution Approach 2:
The geometry of the second fitting recess is changed from a precise circular bore to a slotted hole with radial adjustability. This parameter change allows the connection to accommodate tolerance variations without stress, while the precise circumferential dimension maintains alignment accuracy. The slotted design enables easy assembly without forcing components together.
3Stability of the object's composition
If two-part housing design with centering collar is used, then concentricity is improved, but sealing complexity and manufacturing cost increase
Solution Approach 1:
The centering function is segmented between two simple fitting pins rather than using a single complex centering collar. This segmentation simplifies the sealing requirement because each pin creates a simple linear sealing interface rather than requiring a complex circular collar seal. The concentricity is achieved through the combined action of both pins without requiring complex sealing structures.
Data Source
AI summary
A hydrostatic axial piston machine is disclosed, in the housing of which a drive shaft is rotatably mounted about an axis of rotation. The housing comprises a pot-like housing part having a first abutment and a cover-like housing part having a second abutment. The two abutments are clamped against one another in a sealing manner. A first fitting pin is inserted precisely into a first fitting recess of the first abutment on the one hand and into a second fitting recess of the second abutment on the other hand. A second fitting pin is provided on a side opposite the axis of rotation, which is inserted precisely into a third fitting recess of the first abutment on the one hand and into a fourth fitting recess of the second abutment on the other hand. The second fitting recess has a radial widening relative to the axis of rotation, whereby the second fitting recess is a slotted hole and/or a fitting groove.