Traveling Pump Hydraulic Layout for Faster Normal Rotation Response
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Solution Overview
Problem
Existing hydraulic systems in working machines, such as skid steer loaders and compact track loaders, lack improved responsiveness in the normal rotation of left and right traveling pumps during actuation of the actuation valve.
Innovation Solution
Incorporating a hydraulic system with left and right traveling pumps that include pressure-receiving portions for normal and reverse rotations, actuation valves, drainage fluid passages, and check valves to control operation fluid flow, along with restrictors on fluid passages to enhance responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a third fluid passage is added to connect the second fluid passage to the first fluid passage between the operation valve and actuation valve, then the responsiveness of hydraulic equipment in changing the opening degree of the actuation valve is improved, but the device complexity increases
Solution Approach 1:
The hydraulic system is divided into multiple fluid passages (first, second, third, fourth, fifth) with distinct functions. The third fluid passage specifically connects the second fluid passage to a section of the first fluid passage between the operation valve and actuation valve, allowing operation fluid to flow independently to improve responsiveness without interfering with other system functions.
Solution Approach 2:
A check valve is introduced as an intermediary component on the third fluid passage to control the direction of operation fluid flow. This check valve allows operation fluid to flow from the second fluid passage to the first fluid passage while preventing reverse flow, enabling improved responsiveness without causing unwanted fluid circulation.
2Measurement precision
If check valves are added to control operation fluid flow direction in the fourth and fifth fluid passages, then the control precision of the traveling pumps is improved, but the device complexity increases
Solution Approach 1:
Check valves are positioned on the fourth and fifth fluid passages to act as intermediaries that automatically control the direction of operation fluid flow. These check valves ensure that operation fluid flows only in the intended direction to the pressure-receiving portions of the traveling pumps, improving control precision while requiring minimal additional components.
Solution Approach 2:
The system utilizes hydraulic pressure and check valve mechanics to achieve automatic flow direction control without requiring external actuators or complex control systems. The check valves leverage the inherent hydraulic pressure to open and close, providing precise control of operation fluid distribution to the traveling pumps.
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 system improves the responsiveness of left and right traveling pumps during normal rotation, allowing for more precise control and efficient operation of the working machine.
Implementation Method 1
a check valve disposed on the third fluid passage to allow operation fluid to flow from the second fluid passage to the first fluid passage and to prevent the operation fluid flowing from the first fluid passage to the second fluid passage
Implementation Method 2
a third restrictor provided on the first traveling fluid passage and on an opposite side of a third joint between the first traveling fluid passage and the fourth fluid passage from the left traveling pump
Implementation Method 3
a left traveling pump, including a first pressure-receiving portion and a second pressure-receiving portion, configured to normally rotate the left traveling motor when operation fluid is applied to the first pressure-receiving portion
Data Source
AI summary
A working machine includes: a left traveling motor; a right traveling motor; a left traveling pump including a first pressure-receiving portion and a second pressure-receiving portion; a right traveling pump including a third pressure-receiving portion and a fourth pressure-receiving portion; a traveling operation device configured to apply operation fluid to at least any one of the first, second, third and fourth pressure-receiving portions according to operation of a traveling operation member; an actuation valve configured to supply operation fluid to the traveling operation device, and change a pressure of the operation fluid supplied therefrom to the traveling operation device; a fourth fluid passage fluidly connecting the drainage to the second traveling fluid passage; and a fifth fluid passage fluidly connecting the drainage to the fourth traveling fluid passage.