Swash Plate Axial Positioning via Gap Adjuster
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Solution Overview
Problem
The swash plate type liquid-pressure rotating device faces challenges in assembly workability due to manufacturing errors causing variations in the gap size between the spherical bushing and the cylinder block, leading to complex assembly processes and potential shoe tilting issues.
Innovation Solution
The device incorporates a movement restricting mechanism with a gap adjusting member and stopper members to fix the axial position of the rotating shaft relative to the casing, preventing shoe tilting by maintaining constant contact between the spherical bushing, retainer plate, and swash plate, and allowing easier assembly by performing gap filling outside the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between the spherical bushing and the cylinder block is filled using shim plates or press-fit parts, then the shoe is prevented from tilting over, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The invention extracts the gap-filling function from the internal assembly (between spherical bushing and cylinder block) and relocates it to an external position (between bearing and casing). This allows the gap to be filled with a press-fit part that can be easily adjusted and installed without complex disassembly operations, thereby preventing shoe tilting while simplifying the assembly process
Solution Approach 2:
The invention introduces a press-fit part as an intermediary element between the bearing and the casing. This press-fit part serves as a mediator that absorbs manufacturing errors and gap variations, enabling simple assembly operations while effectively preventing shoe tilting through proper gap control
2Reliability
If the gap between the spherical bushing and the cylinder block is filled using shim plates or press-fit parts, then the shoe is prevented from tilting over, but the assembly time increases due to measurement and reassembly steps
Solution Approach 1:
The invention extracts the gap-filling operation from the internal assembly sequence and positions it externally between the bearing and casing. This extraction eliminates the need for time-consuming measurement and disassembly-reassembly cycles, reducing assembly time while maintaining effective shoe tilting prevention through the press-fit part
Solution Approach 2:
The invention performs the gap-filling action preliminarily by positioning the press-fit part between the bearing and casing before final assembly. This preliminary positioning allows for easy adjustment and eliminates subsequent time-consuming operations, thereby reducing total assembly time while ensuring proper gap control to prevent shoe tilting
3Ease of operation
If the axial position of the rotating shaft is not fixed, then the assembly is more flexible, but the shoe tilts over due to increased rotational speed forces
Solution Approach 1:
The invention introduces a press-fit part as an intermediary element between the bearing and casing that provides axial positioning of the rotating shaft. This intermediary component maintains assembly flexibility while ensuring the shoe remains stable during operation by preventing tilting through proper force balance at high rotational speeds
4Manufacturing precision
If the gap adjusting member is installed inside the casing, then the axial position is precisely controlled, but the assembly workability decreases
Solution Approach 1:
The invention extracts the gap-adjusting operation from the internal casing assembly and relocates it to an external position between the bearing and casing. This extraction maintains precise axial position control through the press-fit part while dramatically improving assembly workability by eliminating complex internal disassembly and reassembly operations
Data Source
AI summary
A swash plate type liquid-pressure rotating device includes a movement restricting mechanism configured to restrict a movement of a spherical bushing relative to a rotating shaft toward a first side in an axial direction. The movement restricting mechanism is a restricting member such that a portion of the spherical bushing which portion is located at the first side in the axial direction contacts the restricting member. The swash plate type liquid-pressure rotating device further includes: a stopper attached to the rotating shaft; and a gap adjusting member. The gap adjusting member is inserted into a gap G3 formed between the stopper and the bearing when the spherical bushing, the retainer plate, the shoe, and the swash plate tightly contact one another in the axial direction. The gap adjusting member restricts a movement of the rotating shaft relative to the casing toward the first side in the axial direction.