Slide Valve Channel Layout for Lower Pressure Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing slide valves for motor vehicle automatic transmissions face high production costs due to complex injection molding tools and suffer from high pressure losses due to small flow cross-sections, limiting their efficiency and range of use.
Innovation Solution
The channel in the slide valve is delimited radially by the outer wall of the guide element and the inner wall of the valve housing, allowing for simpler production and increasing the flow cross-section, reducing pressure drops and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the guide element is completely encapsulated by the plastic of the valve housing, then the production of the slide valve becomes more expensive due to complex injection molding tools, but the structural integrity is improved
Solution Approach 1:
The invention extracts the guide element from the plastic material of the valve housing, creating a hybrid construction where the metal guide element is not completely encapsulated. This allows the use of simpler injection molding tools that do not require complex moving slides, thereby reducing production costs while maintaining structural integrity through the combination of materials.
2Reliability
If the guide element is completely encapsulated by the plastic of the valve housing, then the structural integrity is improved, but the flow cross section becomes smaller leading to higher pressure losses
Solution Approach 1:
By extracting the guide element from complete encapsulation, the invention creates space for a larger flow cross-section in the channel. The metal guide element's outer wall serves as one boundary of the channel, allowing the channel to extend further into the valve housing without requiring additional wall thickness, thus reducing pressure losses while maintaining structural integrity.
3Ease of manufacture
If less injection molding material is used, then the manufacturing costs are reduced, but the structural support may be compromised
Solution Approach 1:
The invention employs composite materials by combining metal (guide element) and plastic (valve housing) in a hybrid construction. This allows the plastic material to be used more efficiently without compromising structural support, as the metal guide element provides additional structural strength where needed while the plastic provides support in other areas, reducing overall material usage and manufacturing costs.
Data Source
Figure 1a~1c
AI summary
Slider valve, in particular for an automatic transmission of a motor vehicle, having a valve housing (2) which accommodates a guide element (3) in which an axially movable valve slide (4) is arranged, and the valve housing (2) has at least one pressure connection (20) and one tank connection (21) spaced axially from this and a working connection (22), with at least one pressure connection opening (30) connected to the pressure connection (20) on the guide element (3) and one pressure connection opening (30) being spaced axially from this and connected to the tank connection (21). Tank connection opening (31) and a working connection opening (32) arranged axially between the pressure connection opening (30) and the tank connection opening (31) and connected to the working connection (22), there being a channel (5) running axially in certain areas in the valve housing (2). is present, which connects the working port opening (32) to the working port (22), and wherein the channel (5) radially inside of the outer wall (39) of the guide element (3) and radially on the outside by an inner wall (29) of the valve housing (2).