Swash Plate Support Attachment Structure for Hydraulic Pumps
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Solution Overview
Problem
Existing hydraulic apparatuses face issues with the unstably fixed state of swash plate supports, leading to potential damage from vibrations and displacement, and require complex attachment and detachment processes with additional components like bolts and seals.
Innovation Solution
An attachment structure for the swash plate support that allows rotation between attachment positions, using a pin member and spring force to prevent axial displacement and rotation, eliminating the need for bolts and seals, and simplifying attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pin is used to prevent rotation of the swash plate support, then rotational stability is improved, but axial displacement may still occur leading to unstable fixation
Solution Approach 1:
The attachment structure is divided into two independent functional elements: a pin for preventing rotation and a protrusion-with- groove mechanism for preventing axial displacement. This segmentation allows each element to specialize in its specific function, ensuring both rotational and axial stability without interference between the two constraint systems.
Solution Approach 2:
The groove structure acts as an intermediary element between the protrusion and the casing. It provides a controlled interface that prevents axial displacement while allowing the pin to independently handle rotational constraints. The groove mediates the axial constraint function, separating it from the rotational constraint function handled by the pin.
2Reliability
If bolts are used to fasten the swash plate support to the casing, then both rotation and axial displacement are prevented, but the attachment and detachment process becomes complex and requires additional components like seals
Solution Approach 1:
The invention extracts the sealing function from the attachment structure. By using a through-hole for the pin rather than bolts requiring sealing, the design eliminates the need for seals and other complex fastening components. The pin-and-groove mechanism provides comprehensive fixation without requiring sealing elements, significantly simplifying the overall structure.
Solution Approach 2:
Instead of using multiple fastening elements (bolts, nuts, seals) to achieve comprehensive fixation, the invention inverts the approach by using a minimalistic pin-with-groove system. The groove structure, rather than requiring multiple separate components, provides the axial constraint function that would otherwise require additional fastening elements, thereby reducing overall complexity.
3Ease of operation
If a through-hole is made for the pin in the casing, then the swash plate support can be attached, but oil leakage may occur without additional sealing components
Solution Approach 1:
The invention converts the potential harm of oil leakage through the pin hole into a benefit by designing the groove structure to fit precisely within the hole. The groove acts as a mechanical seal that prevents oil leakage while maintaining the simplicity of the through-hole design. This transforms a potential leakage point into a sealed interface without requiring additional sealing components.
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 solution effectively suppresses the unstably fixed state of swash plate supports, preventing damage and facilitating easy attachment and detachment without oil leakage, reducing component complexity and operational hassle.
Implementation Method 1
a spring force generating means for elastically pressing the pin member in an engagement direction
Data Source
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AI summary
[Object] To provide an attachment structure of a swash plate support, that is, an attachment structure which suppresses an unstably fixed state of the swash plate support and realizes easy attachment and detachment of the swash plate support to and from a casing. [Solution] A casing 26 of a piston pump 20 and a swash plate support 60 which is attachable to the casing 26 include a displacement preventing means 77 and a rotation preventing means 78. In the swash plate support 60 and the casing 26, since an engaging pawl portion 72 of the displacement preventing means 77 engages with an engaging portion 63, relative displacements in a first direction X1 and a second direction X2 along the rotational axis L20 are prevented, and since a pin member 67 of the rotation preventing means 78 fits in the pin fit hole 73, relative rotations around the rotational axis L20 are prevented.