Electrohydraulic valve with filter
The electrohydraulic valve addresses the challenge of securely and economically mounting plastic filter bands in plastic valve sleeves by using axial and circumferential webs for support and controlled welding, ensuring durability and automatability.
Patent Information
- Application Number
- DE102018115913
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2018-07-02
- Publication Date
- 2025-07-31
- Estimated Expiration
- 2038-07-02
AI Technical Summary
Existing electrohydraulic valves with plastic valve sleeves face challenges in securely and cost-effectively mounting plastic filter bands in grooves without deforming the valve sleeve during assembly, particularly when using welding methods that require low heat input.
The electrohydraulic valve features a plastic filter band captively mounted in an outer groove of the valve sleeve, with predefined welding energy direction and intensity, utilizing axial and circumferential webs for support and alignment, and a sonotrode to ensure minimal heat input, allowing for robust and automatable assembly.
This solution ensures a durable and cost-effective mounting of plastic filter bands without deforming the valve sleeve, maintaining the valve's integrity and enabling automated assembly.
Smart Images
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Abstract
Claims
[1] Electrohydraulic valve (1) with at least one filter band (2) which is arranged captively in an outer groove (3) of a valve sleeve (4) of the switching or proportional valve (1) characterized by , that the filter band (2) and the valve sleeve (4) are made of plastic, wherein the filter band (2) is arranged overlapping at its ends in the groove (3) and the overlapping ends of the filter band (2) are welded together, and wherein at least one web (5) is arranged in the groove (3), which serves to align and / or support the filter belt (2), and wherein at least two circumferential webs (7, 7') and at least one axially extending web (5) are present in the groove (3), and wherein the circumferential webs (7, 7') ensure a sufficient distance between the filter band (2) and the groove base (6) of the valve sleeve (4) and wherein the at least one axially extending web (5) offers the filter band (2) a flat support surface. [2] Electrohydraulic valve (1) according to claim 1, characterized by that the filter belt (2) directs the direction and local intensity of the introduced welding energy through the structure of its fabric. [3] Method for the captive fastening of a filter band (2) made of plastic in an outer groove (3) in a valve sleeve (4) made of plastic of the electro-hydraulic valve (1) according to claim 1 characterized by , that at least one axial web (5) made of plastic is located in the groove (3) and the filter band (2) is aligned with the axial web (5) and placed on the web (5), and the filter band (2) is inserted into the groove (3) with overlapping ends, and then the overlapping ends of the filter band (2) are welded. [4] Method according to claim 3, characterized by that the overlapping ends of the filter band (2) are welded together by sound, wherein the direction and the local intensity of the introduced welding energy is determined by the shape of the sonotrode (8) of the sonic welding device. [5] Method according to claim 3, characterized by that the overlapping ends of the filter belt (2) are welded together by sound, wherein the direction and the local intensity of the introduced welding energy is determined by the structure of the fabric of the filter belt (2).
Citation Information
Patent Citations
Bushing for hydraulic piston valve of camshaft adjuster, has wall with inner side and outer side, opening arranged in wall, and filter element arranged on inner side of wall, where inner ring channel is assigned to opening
DE102012110570A1