Rotary Swash Plate Pump Ring Inlet Layout for Compact Flow Paths
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Solution Overview
Problem
Existing rotary swash plate piston pumps have a large cylinder block size due to the connection of inlet ports to cylinder chambers via multiple inlet chambers, leading to an enlarged pump design.
Innovation Solution
The inlet passage is formed in the casing on the other side of the cylinder block in the axial direction, overlapping the cylinder bores, and is shaped as a ring, allowing for a compact design with a secured channel area and reduced power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inlet passage is formed on the same side as the cylinder bores, then the connection to cylinder chambers is simplified, but the pump size increases due to the need for multiple inlet chambers in the cylinder block
Solution Approach 1:
The inlet passage is moved from the radial direction to the axial direction, forming a ring-shaped passage on the other side of the cylinder block in the axial direction. This dimensional repositioning allows the inlet passage to overlap the cylinder bores axially, eliminating the need for multiple inlet chambers in the cylinder block while maintaining functional connectivity.
Solution Approach 2:
The inlet passage is merged into the casing structure as a ring-shaped passage that surrounds the cylinder bores axially. This integration combines the inlet function with the casing structure, eliminating separate inlet chambers and reducing overall pump volume.
2Volume of moving object
If the inlet passage channel area is reduced to make the pump compact, then the pump size decreases, but power loss increases due to restricted fluid flow
Solution Approach 1:
By positioning the inlet passage in the axial direction to overlap the cylinder bores, the passage utilizes the axial space efficiently. This allows the pump to be compact radially while maintaining adequate passage cross-sectional area for fluid flow, as the passage extends axially rather than radially.
Solution Approach 2:
The ring-shaped inlet passage is designed to overlap all cylinder bores axially, creating multiple flow paths simultaneously. This effectively increases the total channel area available for fluid distribution to multiple cylinders without increasing the radial footprint of the pump.
3Productivity
If the discharge passage is formed to connect multiple cylinder bores, then the discharge function is achieved, but the passage structure becomes complex and large in size
Solution Approach 1:
The discharge passage is formed as a ring-shaped structure in the axial direction that surrounds the cylinder bores. This axial positioning allows a single discharge passage to collect fluid from multiple cylinder bores simultaneously, simplifying the structure compared to individual discharge passages for each bore.
Solution Approach 2:
The ring-shaped discharge passage serves multiple functions: it collects discharge fluid from multiple cylinder bores, provides a common discharge chamber for all cylinders, and enables compact arrangement of the discharge system. This multi-functional design eliminates the need for separate discharge passages for each cylinder bore.
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 compact design reduces power loss and enables efficient fluid flow, while the discharge passage surrounds the cylinder bores for cooling and pulsation cancellation, resulting in a more compact and efficient hydraulic pump.
Implementation Method 1
a rotary swash plate that is housed in the casing so as to be rotatable about an axis and reciprocates each of the plurality of pistons
Implementation Method 2
the discharge passage exteriorly surrounds the plurality of cylinder bores. Therefore, the cylinder bores can be cooled from the outside using the working fluid flowing in the discharge passage
Data Source
AI summary
This rotary swash plate hydraulic pump includes: a casing; a cylinder block that is disposed in the casing so as to prevent relative rotation of the cylinder block and including a plurality of cylinder bores; a plurality of pistons each of which is inserted into a corresponding one of the plurality of cylinder bores; and a rotary swash plate that is housed in the casing so as to be rotatable about an axis and reciprocates the plurality of pistons. The casing includes an inlet passage that is in the shape of a ring and to which each of the plurality of cylinder bores is connected. The inlet passage is formed on the other side of the cylinder block in an axial direction in the casing and positioned so as to overlap the plurality of cylinder bores.