Adjustable pressure limiting valve and engine manufacturing method and technical realization elements

Technical realization elements:

4. In view of the aforementioned shortcomings, the first technical problem to be solved by the present utility model is to provide an adjustable pressure limiting valve which can quickly adjust the oil pressure with small fluctuations in the oil pressure. Based on the same inventive concept, the second technical problem to be solved by the present utility model is to provide an engine using the above-mentioned pressure limiting valve to keep the engine oil pressure stable and ensure the normal operation of the engine.

5. In order to solve the first technical problem, the technical solution of this utility model is:

6. An adjustable pressure limiting valve, comprising: a valve body and a valve core arranged in the valve body, the valve body is provided with an oil inlet and an oil outlet, and the valve body is also provided with a slide valve, so The inner cavity of the valve body located at a section between the slide valve and the valve core is a control cavity, the control cavity is in communication with the oil inlet, and a return spring is provided in the control cavity. The control chambers are respectively located on opposite sides of the valve core, the side of the slide valve opposite to the control chamber is provided with a pressure regulating spring, the oil outlet corresponds to the position of the valve core, and the valve The body is provided with an oil drain passage corresponding to the position of the slide valve, and the oil outlet is communicated with the oil drain passage.

7. Preferably, the valve core is provided with a balance hole connecting the control cavity and the oil inlet.

8. Preferably, the valve body includes a valve body body and a mounting housing fixed in the valve body body, the valve core slides in the valve body body, the control cavity, and the oil inlet The oil outlet and the oil outlet are respectively provided in the valve body, the slide valve is slid in the installation housing, and the oil drain is provided in the installation housing.

9. Preferably, a safety valve is provided in the slide valve, the safety valve includes a safety oil passage and a valve ball that controls the on-off of the safety oil passage, and a safety spring is provided on one side of the valve ball. One end of the safety oil passage communicates with the control chamber, the other end of the safety oil passage communicates with an annular oil chamber, the annular oil chamber communicates with the drain passage, and the annular oil chamber is provided in the slide valve Peripheral side.

10. Preferably, the mounting housing is fixedly provided with a cover plate, the cover plate is threadedly connected with an adjusting screw, the adjusting screw is threadedly connected with a lock nut, and the pressure adjusting spring is located between the adjusting screw and the adjusting screw. Between the slide valves.

11. Preferably, the cover plate is fixedly provided with a protective cover connected with it, and the head of the adjusting screw is located on the protective cover

Inside.

12. Preferably, the mounting housing, the cover plate and the slide valve jointly enclose a closed pressure regulating spring cavity, the pressure regulating spring is located in the pressure regulating spring cavity, the pressure regulating spring cavity It communicates with the oil drain.

13. In order to solve the second technical problem, the technical solution of this utility model is:

14. An engine, comprising: a body, an oil pan fixed to the body, and a main oil passage provided in the body, the body is equipped with the above-mentioned adjustable pressure limiting valve, and the valve body is fixed to In the body, the oil inlet is communicated with the main oil passage, and the oil outlet is communicated with the oil pan.

15. After adopting the technical scheme, the beneficial effects of this utility model are:

16. The adjustable pressure limiting valve of the present invention adjusts the communication volume between the control chamber and the oil drain through the left and right movement of the slide valve, and changes the oil discharge volume in the control chamber to adjust the pressure of the control chamber. The oil is incompressible, and a relatively large pressure change in the control chamber can be achieved through a small movement of the spool valve, so as to quickly adjust the pressure of the oil inlet.

17. Compared with the simple spring adjustment, the spool valve adjustment response is rapid, stable and fast, and the pressure fluctuation is small. When the engine speed or load changes repeatedly resulting in sudden changes in the oil pressure and flow, this solution can also better maintain the pressure in the oil inlet to be stable.

18. Due to the small movement of the spool valve and the small change in the setting pressure of the pressure regulating spring, even if the pressure and flow rate in the oil inlet vary greatly, the pressure of the oil inlet will basically remain at a fixed value after adjustment, which is beneficial to maintain The pressure state of the engine oil protects the safety of the engine.

19. The spool valve has a wide flow adjustment range and a wide applicable pressure range, which can meet the adjustment requirements of various power engines.

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