Hydraulic Steering Gear Unloading Valve
A technology of hydraulic steering gear and unloading valve, which is applied in the direction of fluid steering mechanism, etc. It can solve the problems of high difficulty in component processing, small size of unloading valve, complex processing technology, etc., so as to increase work stability, reduce production cost, and structure well-designed effects
Active Publication Date: 2017-07-21
LINHAI JIAMEI MACHINERY MFG
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
The unloading valve with this structure is small in size, and has high requirements on the material and machining accuracy of the thimble B, pilot valve core C and positioning sleeve D, the parts are difficult to process, and the processing technology is complicated, which increases the production cost of this unloading valve
Method used
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Embodiment Construction
[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0021] Hydraulic steering gear unloading valve, including valve seat 1, constant pressure spring 3, pilot valve seat 4, spring seat 5, steel ball 6, valve core 7, main valve spring 8 and valve core sleeve 9.
[0022] The inside of the pilot valve seat 4 is provided with an adjustment chamber for accommodating the constant pressure spring 3, the spring seat 5 and the steel ball 6, and the pilot valve seat 4 is provided with small oil outlet holes 4a and Adjust chamber oil inlet hole 4b. One end of the constant pressure spring 3 touches the valve seat 1 , and the other end touches the spring seat 5 . The steel ball 6 is clamped in the groove on the spring seat 5; the steel ball 6 touches the inner wall of the pilot valve seat 4 to close the oil inlet hole 4b of the regulating chamber.
[0023] Furthermore, the regulating cavity of the pilot valve seat 4 inclu...
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The invention relates to an unloading valve of a hydraulic steering gear and belongs to a fluid pressure executing mechanism. The unloading valve comprises a valve seat, a level pressure spring, a pilot valve seat, a spring seat, a steel ball, a valve spool, a main valve spring and a valve spool barrel. The pilot valve seat is provided with a small oilway outlet hole and an adjusting cavity oil inlet hole which are communicated with an adjusting cavity, one end of the level pressure spring contacts with the valve seat, and the other end of the level pressure spring contacts with the spring seat. The steel ball contacts with the inner wall of the pilot valve seat so as to close the adjusting cavity oil inlet hole, the main valve spring is arranged in the valve spool, one end of the main valve spring contacts with the pilot valve seat, and the other end of the main valve spring contacts with the inner wall of the valve spool. The valve spool is sleeved in the valve spool barrel and is slidably matched with the same. The valve spool is provided with a damping hole, and the valve spool barrel is provided with a large oilway outlet hole and a main oil inlet. Compared with a conventional unloading valve, the unloading valve of the hydraulic steering gear has the advantage that production cost is reduced since the steel ball and the level pressure spring are standard parts and the spring seat is easy to machine.
Description
technical field [0001] The invention belongs to a fluid pressure actuator, in particular to an unloading valve for a hydraulic steering gear. Background technique [0002] When the axle load mass of the steering axle of a motor vehicle is greater than 4000kg, a power steering device must be used. When the power steering device fails, the motor vehicle turns through the unloading valve on the steering gear, so that the steering wheel can still control the motor vehicle. [0003] The function of the unloading valve is to control the pressure of the hydraulic steering system from increasing, for example, the unloading pressure of the ZLD7276 series steering gear is 16.5MPa. However, due to the limited flow capacity of the products currently on the market, the pressure continues to rise after the system is unloaded, up to 19MPa. Due to the high pressure, there are certain hidden dangers in the quality of the steering pump and hydraulic steering gear. The specific failure modes...
Claims
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IPC IPC(8): B62D5/08
CPCB62D5/08
Inventor 李宏跃黄敬志方永奇张海龙陈光涛
Owner LINHAI JIAMEI MACHINERY MFG