Hydraulic Valve Stroke Stop Adjustment Mechanism
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Solution Overview
Problem
Existing hydraulic valve devices face challenges in precisely and conveniently adjusting stroke stops due to the need for access on both sides of the housing, leading to imprecise settings caused by play, friction, and mechanical deformations when adjusting end stops indirectly through a hand lever mechanism.
Innovation Solution
The hydraulic valve device allows for direct and precise adjustment of counter-stops on the same axial end region of the slide piston, with accessible adjusting screws that apply loads directly to the control slide, eliminating intermediate mechanical elements and deformations, enabling easy and accurate adjustment from one side of the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If end stops are adjusted from both sides of the valve housing, then the adjustment mechanism is symmetric and stable, but both sides of the housing must be accessible which is not always possible in installation situations
Solution Approach 1:
The patent combines both stop adjustment functions into a single accessible location. The first stop (13) and second stop (14) are both adjusted from the same side of the housing (1, 2), eliminating the need for access to both sides. This is achieved by having the first adjusting screw (29) and second adjusting screw (49) both accessible from the same side, allowing installation in spaces where only one side is accessible.
2Ease of operation
If the second end stop acts on the hand lever to limit movement, then adjustment is possible from one side, but the stop mechanism operates inaccurately due to play, friction, and deformation of the adjustment mechanism
Solution Approach 1:
The patent extracts the hand lever from the stop adjustment mechanism. The first stop (13) and second stop (14) act directly on the control slide (5) without involving the hand lever (18). This separation eliminates the inaccuracies caused by play, friction, and deformation in the hand lever mechanism, while the adjusting screws (29, 49) remain accessible from the same side for convenient adjustment.
Solution Approach 2:
The patent introduces direct mechanical contact between the stops and control slide as an intermediary mechanism. The first stop (13) with stop surface (13a) and second stop (14) with stop surface (14a) provide direct positioning of the control slide (5) through adjusting screws (29, 49), eliminating the need for the hand lever (18) as an intermediary and thus removing sources of adjustment inaccuracy.
3Ease of operation
If adjusting mechanisms are used to act indirectly on the control slide via hand lever mechanics, then adjustment is possible from one side, but unfavorable actuation forces result in deformation of the mechanism and further impairment of adjustment accuracy
Solution Approach 1:
The patent removes the hand lever (18) from the stop adjustment path. The adjusting screws (29, 49) now act directly on the control slide (5) through the stops (13, 14), eliminating the complex hand lever mechanism that caused deformation under actuation forces. This direct action path maintains mechanical stability while preserving single-side accessibility.
Data Source
Figure 1
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AI summary
The invention relates to a hydraulic valve device, in particular an LS directional valve, comprising fluid connections provided on a housing arrangement (1), such as at least one pressure supply connection (P), at least one utility connection (A, B), and preferably a load-reporting connection, and comprising a controller (5) which can be moved in one movement direction or another movement direction in order to at least partly actuate fluid connections of the housing arrangement (1). An adjustable stop device (25, 31, 47, 59) is provided which restricts the stroke length of the travel movements of the controller (5) or parts of the stroke length in the one direction or in the other direction. The invention is characterized in that the stop device (25, 31, 47, 59) has a stop surface (25) facing in one movement direction and a second stop surface (47) facing in the other movement direction on the same axial end region (19) of a slider piston (5), and a counter stop (31, 59) is provided for each stop surface (25, 47), both counter stops being arranged on the respective same end region (11) of the housing arrangement (1) in a positionally adjustable manner.