Hydraulic Cylinder Check Valve Throttle for Smooth Retraction
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Solution Overview
Problem
Existing hydraulic cylinder devices experience jerky motion when the outboard motor is tilted down due to pressure fluctuations, which are difficult to stabilize with existing throttling mechanisms that require additional components or variable flow channel shapes.
Innovation Solution
A hydraulic cylinder device with a pump, a valve body, and non-return valves featuring a movable member, elastic member, and support member with a through hole acting as a throttle, maintaining a fixed flow channel shape to stabilize the throttle effect without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a throttle is formed in the flow channel to suppress jerky motion, then the jerky motion is suppressed, but the shape of the flow channel at the throttled portion must be unchanged to stabilize the throttle effect, which increases device complexity when provided separately
Solution Approach 1:
The support member with the through hole is merged into the existing non-return valve structure, combining the throttle function with the valve body rather than being a separate component. This integration maintains the stable throttle effect while avoiding increased device complexity
Solution Approach 2:
The support member serves multiple functions: it supports the elastic member, provides the through hole as a throttle, and maintains structural integrity of the non-return valve. This multi-functionality eliminates the need for separate throttle components
2Reliability
If the outboard motor is heavier than expected or air is mixed into the flow channel, then pressure in the flow channel becomes too low, but this causes the upper chamber-side activation valve to not remain displaced, resulting in repeated opening/closing of the non-return valve and jerky motion
Solution Approach 1:
The throttle formed by the through hole acts as an intermediary that regulates pressure distribution in the flow channel, maintaining sufficient pressure to keep the activation valve displaced even when overall system pressure decreases due to heavy load or air mixing
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 solution effectively suppresses jerky motion during retraction by maintaining consistent pressure and flow control, ensuring accurate operation without adding components, thus stabilizing the throttle effect.
Implementation Method 1
an elastic member that gives force to the movable member in a direction to close the one opening portion
Implementation Method 2
the support member that has a through hole that serves as a throttle of the flow channel from the one chamber toward the exterior
Data Source
AI summary
A hydraulic cylinder device includes: a pump; a valve body disposed so as to partition an inside of a chamber into chambers; and a non-return valve including a movable member, an elastic member and a support member. The movable member moves to open/close one opening portion that is an opening portion on the one chamber side in a case that forms a flow channel from the one chamber toward an exterior. The elastic member gives force to the movable member in a direction to close the one opening portion, and has one end portion supported by the movable member. The support member is disposed to close an opening portion on the exterior side in the case to support the other end portion of the elastic member, and has a through hole that serves as a throttle of the flow channel from the one chamber toward the exterior.