Oil-pressure-controlling device for big inertial load
阅读：609发布：2022-03-09
专利汇可以提供Oil-pressure-controlling device for big inertial load专利检索，专利查询，专利分析的服务。并且Cavitation and stalling of a hydraulic motor coupled to a large inertial load is prevented by a self-operating valve sensitive to applied oil pressure and the pressure of oil returned to the sump for controlling the pressurized fluid operating on the hydraulic motor.，下面是Oil-pressure-controlling device for big inertial load专利的具体信息内容。
1. An oil-pressure-controlling device for a hydraulic motor coupled to a large inertial load comprising: a valve body including first and second independent bores formed therein, a first pair of inlet and outlet ports hydraulically coupled to said first bore and hydraulically connected respectively to a source of pressurized oil and a tank through a directional control valve, a pair of annular chambers hydraulically coupled to said second bore and connected to intake and exhaust passages to said hydraulic motor, a slidable valve seat cylinder carried by said second bore between said pair of annular chambers and axially slidable between limits and defining a common bypass passage between said intake and exhaust passages of said hydraulic motor, plungers carried by said second bore on opposite sides of said valve seat cylinder, springs biasing each plunger in pressure contact with the respective ends of said slidable valve seat cylinder, the oil pressure of either said intake or exhaust passage of said hydraulic motor upon reaching a predetermined value causes the valve seat cylinder to slide to a predetermined limit position to open the bypass passage between the exhaust and intake passages of said hydraulic motor, a high-pressure crossover relief valve means for each plunger, a slidable valve spool carried by said first bore, poppet valves operatively associated with the slidable valve spool and said intake and exhaust passages to said hydraulic motor to insure that regardless of the position of the directional control valve, the exhaust oil passage is automatically opened or closed, depending upon the pressure of the oil in the hydraulic motor exhaust passage.
2. The oil-pressure-controlling device as claimed in claim 1, further comprising: slidable spring seats carried by said second bore at the end of each spring opposite that of said plunger, oil pressure passage means extending between said plunger and said slidable spring seat, whereby: upon an increase in oil pressure, the spring seat is moved to further compress the spring and to thereby effect spring pressure biasing of said plunger in two steps to prevent abrupt pressure increase due to the presence of said large inertial load.
3. The oil-pressure-controlling device as claimed in claim 1, further comprising a nozzle centrally disposed within each of said annular chambers and operatively coupled to the common bypass passage for inducting pressurized oil from said oil supply passage by discharge of the bypass oil through said nozzle from said bypass passage.
4. The oil-pressure-controlling device as claimed in claim 2, further including an annular chamber positioned in the oil supply passage and a nozzle centrally disposed within said annular chamber and operatively coupled to said common bypass passage for inducting pressurized oil from said oil supply passage by nozzle discharge of bypass oil.
5. The oil-pressure-controlling device as claimed in claim 1, wherein said relief valve comprises a valve seat, a poppet valve disposed against the open end of a small shaft hole within said valve seat, said poppet valve having a sharply pointed head portion formed at an obtuse angle at one end thereof and abutting said valve seat on one end thereof and having a plurality of passages extending axially on the outer surface thereof with said plungers disposed at opposite ends of the bypass passage.
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