Hydraulic Motor Brake Valve Layout for Fewer Pipes and Stable Response
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Solution Overview
Problem
The existing brake systems for fluid pressure motors have increased manufacturing costs due to the complexity of the switching valve configuration, which includes multiple passages and components, leading to higher processing and assembly times.
Innovation Solution
A brake system with a simplified valve device configuration that uses a spool valve or poppet valve to control the supply passages, eliminating the need for separate pilot pressure lines by directly opening with pressurized working fluid, and incorporating a discharge passage with a restrictor to manage fluid flow and air discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switching valve with separate supply passage and introduction passage for pilot pressure is provided, then the brake system can control brake force generation and cancellation, but the number of pipes and parts increases, leading to increased manufacturing cost and assembly time
Solution Approach 1:
The patent combines the supply passage and introduction passage for pilot pressure into a single integrated passage structure within the switching valve. The valve body includes a first passage for supplying working fluid from the pressurizing source and a second passage for introducing pilot pressure, both passages being formed within the same valve structure rather than requiring separate external piping. This merging reduces the number of pipes and connection parts while maintaining the functional separation needed for reliable brake control.
2Reliability
If a switching valve with multiple passages is provided to control brake force, then brake function is achieved, but the processing time and assembly time increase
Solution Approach 1:
The switching valve is designed with segmented functional zones within a single integrated body. The valve includes a valve element that can move between positions to selectively open or close different passage segments (first passage for working fluid supply, second passage for pilot pressure introduction). This segmentation allows complex multi-passage functionality to be achieved through internal valve geometry rather than external piping, significantly reducing assembly time and processing complexity while maintaining reliable brake force control.
3Reliability
If the number of pipes connecting the pressurizing source to the switching valve is increased, then the brake system can function properly, but the manufacturing cost increases
Solution Approach 1:
The switching valve is designed as a multi-functional component that performs multiple functions: it serves as both a working fluid supply control valve and a pilot pressure introduction valve. The integrated valve body with multiple internal passages eliminates the need for separate dedicated valves or extensive external piping for different functions. This multi-functionality reduces the total number of components and piping requirements, thereby reducing manufacturing cost while ensuring proper brake system function.
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
This configuration reduces manufacturing costs by simplifying the valve device and minimizing the number of pipes required, while stabilizing the activation responsiveness of the brake system and allowing for easier adjustment of brake force generation timing.
Implementation Method 1
the valve element permits communication between the first connection port and the second connection port when pressure of the working fluid led to the first connection port reaches predetermined pressure, and shuts off the communication between the first connection port and the second connection port when the pressure of the working fluid led to the first connection port becomes less than the predetermined pressure
Implementation Method 2
a restrictor configured to apply resistance to the working fluid flowing through the discharge passage
Data Source
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AI summary
A brake system (100) configured to brake a hydraulic motor (1) includes a valve device (40) configured to open and close supply passages (53, 54) through which working oil pressurized in a hydraulic pump (51) is supplied to a brake device (20), the valve device (40) has a first connection port (55a) to which the working oil is led from the hydraulic pump (51), a second connection port (55b) from which the working oil is led to the brake device (20), and a valve element (41) provided with a pressure receiving surface (41a) facing the first connection port (55a), and the valve element (41) permits communication between the first connection port (55a) and the second connection port (55b) when pressure of the working oil led to the first connection port (55a) reaches predetermined pressure, and shuts off the communication between the first connection port (55a) and the second connection port (55b) when the pressure of the working oil led to the first connection port (55a) becomes less than the predetermined pressure.