Variable speed control valve

Abstract

The utility model discloses a variable speed control valve, and belongs to the technical field of engineering machinery. The speed change valve sealing gasket overcomes the defects that in the prior art, due to the fact that a traditional speed change valve sealing gasket is prone to aging, two oil cavities are communicated abnormally, and then gear engaging is abnormal or gears are missed or two gears interfere with each other. The main structure of the hydraulic proportional valve comprises a valve body, a first-gear proportional valve and a second-gear proportional valve are installed on the valve body, a pressure regulating valve is arranged in the valve body, a main oil inlet for oil to enter the valve body is formed in the upper end of the valve body, and a first oil inlet channel communicated with the main oil inlet and a second oil inlet channel communicated with the first oil inlet channel are arranged in the valve body. The first oil inlet channel is communicated with a first-gear proportional valve oil inlet in the first-gear proportional valve, and the second oil inlet channel is communicated with a second-gear proportional valve oil inlet in the second-gear proportional valve. The utility model is mainly applied to engineering machinery.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a speed-changing control valve. Background Art

[0002] With the increasing development of engineering machinery related technologies, people have higher and higher requirements for the shifting quality of engineering machinery, that is, the shifting process must be completed smoothly and quickly. At present, the power shifting in engineering machinery is usually carried out by the gearbox, that is, the hydraulic shift pressure control valve is relied on to adjust the oil pressure change during the shifting process and then control the operation of the shift clutch to achieve the shifting.

[0003] The Chinese utility model patent with the authorization announcement number CN 217152938 U discloses an electronically controlled speed change valve, wherein, taking the first gear shift as an example, the shifting process is as follows: move the first gear shift handle, at this time, the first gear shift handle sends an electrical signal to the ECU, and the ECU outputs a current signal to the first gear proportional solenoid valve 1, at this time, the first gear proportional solenoid valve 1 starts to act, the P1 port and the first gear clutch port F1 are connected, and at the same time, the first gear clutch port F1 and the return oil port T1 are closed, and the oil enters the transmission clutch through the first gear clutch port F1, thereby pushing the piston to move and completing the first gear shifting action. The pressure rise curve of the first gear depends on the output pressure of the first gear proportional solenoid valve 1. By controlling the ECU electronic control program, the pressure curve can be controlled, thereby effectively reducing the shifting shock, and the reverse gear and the second gear shifting process are the same gear. However, its disadvantages are:

[0004] The oil passes through the main oil channel route P-P2, P-P3, P-P1. The oil channel is between the oil tank of the speed change valve and the joint surface of the gearbox. Rubber pads are mostly used between the speed change valve and the gearbox. The structure of the speed change valve sealing pad is as follows: Figure 5 As shown, during assembly, the speed change valve assembly of CN217152938U and Figure 5 After the speed change valve gasket is aligned, it is fixed to the Figure 6 The transmission shown in the figure. The sealing principle is to compress the gasket between the speed change valve assembly and the transmission and deform the gasket to achieve sealing. However, due to the frequent pulses of high-pressure oil and the aging of the gasket, it is easy to damage the gasket, resulting in abnormal communication between the two oil chambers, which causes abnormal gear shifting or missing gears, or interference between the two gears. This problem is prone to oil leakage and even causes transmission failure, causing customer complaints. In addition, to solve the sealing problem between the speed change valve and the transmission, composite steel pads are generally used instead of rubber sheets. Because the strength of the composite steel pad is very good, it will not be damaged. However, the price of the composite steel pad is relatively high, and its production must be mass-produced by mold stamping, and the production cost is relatively high. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a speed-changing control valve.

[0006] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0007] A speed control valve comprises a valve body, on which a first-gear proportional valve and a second-gear proportional valve are mounted, a pressure regulating valve is arranged inside the valve body, a total oil inlet for oil to enter the interior of the valve body is arranged at the upper end of the valve body, an oil inlet passage 1 connected to the total oil inlet and an oil inlet passage 2 connected to the oil inlet passage 1 are arranged inside the valve body, and the oil inlet passage 1 is connected to the first-gear proportional valve oil inlet on the first-gear proportional valve, and the oil inlet passage 2 is connected to the second-gear proportional valve oil inlet on the second-gear proportional valve.

[0008] Preferably, the pressure regulating valve comprises a pressure regulating valve stem arranged inside the valve body, and a spring is arranged on one side of the pressure regulating valve stem.

[0009] Preferably, the valve body is also provided with a lubricating oil port for lubrication, an oil unloading return port for oil unloading, an oil return chamber connected to the oil unloading return port, a spring chamber return port for returning oil to the spring chamber, and a control chamber for controlling the pressure regulating valve stem. After oil comes into the main oil inlet, when the pressure regulating valve stem is pushed to the right, the oil inlet channel is first connected with the lubricating oil port.

[0010] Preferably, the end face of the valve body is provided with a first-gear proportional valve oil return port for connecting the first-gear proportional valve with the oil tank, a working oil port 1 for connecting the first-gear proportional valve with the first-gear clutch, a second-gear proportional valve oil return port for connecting the second-gear proportional valve with the oil tank, and a working oil port 2 for connecting the second-gear proportional valve with the second-gear clutch.

[0011] Preferably, the valve body is further provided with a spring chamber oil return port, which is communicated with a spring chamber for installing a spring.

[0012] Preferably, a first screw plug is installed on the outer end surface of the valve body corresponding to the pressure regulating valve stem, and a second screw plug is installed on the outer end surface of the valve body corresponding to the spring.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The oil inlet channel 1 and the oil inlet channel 2 are set inside the valve body by casting or machining, rather than outside the valve body (at the joint surface between the valve body and the gearbox). This design greatly improves the reliability of the sealing gasket between the speed change valve and the gearbox, and greatly reduces the possibility of leakage;

[0015] 2. The oil inlet channel 1 and the oil inlet channel 2 are inside the valve body, and the proportional valve is directly inserted into the valve body. The valve body can reduce the processing volume and improve the economy; at the same time, it can also reduce the pressure loss from the oil inlet to the solenoid valve, and the energy saving is better;

[0016] 3. When the oil from the main oil inlet pushes the pressure regulating valve stem to the right, the oil inlet channel 1 is connected with the lubricating oil port, and the oil in the lubricating oil port directly enters the bearings or gears in the gearbox through the holes on the valve body for lubrication; if the pressure continues to rise, the oil from the main oil inlet continues to push the pressure regulating valve stem to the right, then the UV oil channel on the oil inlet channel 1 is connected with the oil unloading return port, achieving the purpose of oil unloading, and the oil returns to the gearbox oil pan;

[0017] In summary, the utility model designs the oil inlet channel into the speed change valve body, so that the oil can directly reach the first-gear proportional valve and the second-gear proportional valve at the clutch port of the transmission, and reach the clutch port of the transmission through the reversing of the proportional valve, thereby realizing the transmission clutch shifting. It not only realizes the comfort of proportional valve shifting, but also improves the sealing reliability between the speed change valve and the transmission. By means of casting, the external oil channel is introduced into the speed change valve body. After the speed change valve and the transmission are connected, the oil path of the joint surface is greatly reduced, thereby greatly reducing the risk of the sealing gasket being damaged, and greatly improving the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the second-gear proportional valve in the utility model;

[0021] Figure 4 It is the principle diagram of the speed change hydraulic system;

[0022] Figure 5 It is a structural schematic diagram of a speed change valve sealing gasket in the prior art;

[0023] Figure 6 It is a partial structural schematic diagram of a gearbox in the prior art.

[0024] In the figure: 1. Spring chamber oil return port; 2. Spring chamber; 3. Lubricating oil port; 4. Oil unloading return port; 5. First gear proportional valve oil return port; 6. First gear proportional valve; 7. Working oil port 1; 8. Second gear proportional valve oil inlet port; 9. Working oil port 2; 10. Second gear proportional valve oil return port; 11. Second gear proportional valve; 12. Screw plug 1; 14. Pressure regulating valve stem; 15. Main oil inlet port; 16. Oil inlet channel 1; 17. Spring; 18. Screw plug 2; 20. Oil inlet channel 2; 21. Valve body; 22. Oil tank; 23. Speed ​​change pump; 25. First gear clutch; 26. Second gear clutch; 27. Pressure regulating valve; 29. ​​Control chamber; 30. First gear proportional valve oil inlet port; 40. Oil return chamber; 41. Lubricating oil chamber. DETAILED DESCRIPTION

[0025] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0026] Embodiment 1:

[0027] like Figure 1-3 As shown, a speed control valve includes a valve body 21, on which a first-gear proportional valve 6 and a second-gear proportional valve 11 are installed, a pressure regulating valve 27 is arranged inside the valve body 21, and a total oil inlet 15 for oil to enter the valve body 21 is arranged at the upper end of the valve body 21, and an oil inlet passage 16 connected to the total oil inlet 15 and an oil inlet passage 20 connected to the oil inlet passage 16 are arranged inside the valve body 21, and the oil inlet passage 16 is connected to the first-gear proportional valve oil inlet 30 on the first-gear proportional valve 6, and the oil inlet passage 20 is connected to the second-gear proportional valve oil inlet 8 on the second-gear proportional valve 11.

[0028] In this embodiment, the main oil inlet 15 is set at the uppermost end of the valve body 21 and is provided with a thread; the oil from the speed change pump 23 can be directly connected to the main oil inlet 15 through a hose, so that the oil enters the interior of the speed change control valve. Its internal oil passages are the oil inlet passage 1 16 and the oil inlet passage 2 20, namely the uvw oil passage, which are opened inside the valve body 21 by casting or machining means, so that all the oil from the speed change pump 23 reaches the interior of the valve body 21; after the speed change control valve, the sealing gasket and the gearbox are connected, the oil no longer passes through the joint surface of the gearbox and the valve body, but directly reaches the first gear proportional valve 6 and the second gear proportional valve 11 through the uvw oil passage, which reduces the risk of the sealing gasket being damaged, thereby greatly improving the working reliability of the speed change hydraulic system.

[0029] Embodiment 2:

[0030] A speed control valve is provided. The difference from the first embodiment is that the pressure regulating valve 27 includes a pressure regulating valve stem 14 arranged inside the valve body 21 , and a spring 17 is arranged on one side of the pressure regulating valve stem 14 .

[0031] Furthermore, the valve body 21 is also provided with a lubricating oil port 3 for lubrication, an oil unloading return port 4 for oil unloading, an oil return chamber 40 connected to the oil unloading return port 4, a spring chamber return port 1 for returning oil to the spring chamber 2, and a control chamber 29 for controlling the pressure regulating valve stem 14. After oil comes into the main oil inlet 15, when the pressure regulating valve stem 14 is pushed to the right, the oil inlet channel 16 is first connected with the lubricating oil port 3.

[0032] In this embodiment, when oil from the main oil inlet 15 pushes the pressure regulating valve stem 14 to the right, the oil inlet channel 16 is connected with the lubricating oil port 3, and the oil in the lubricating oil port 3 directly enters the bearings or gears in the gearbox for lubrication; but due to some reasons, the viscosity of the hydraulic oil increases abnormally or the oil inlet flow rate increases abnormally, the oil inlet pressure will continue to increase, and the oil from the main oil inlet 15 will continue to push the pressure regulating valve stem 14 to the right, then the UV oil channel on the oil inlet channel 16 is connected with the oil return port 4 through the oil return chamber 40, thereby achieving the purpose of unloading oil, and the oil returns to the gearbox oil pan.

[0033] Furthermore, the end surface of the valve body 21 is provided with a first gear proportional valve oil return port 5 for connecting the first gear proportional valve 6 with the oil tank 22, a working oil port 7 for connecting the first gear proportional valve 6 with the first gear clutch 25, a second gear proportional valve oil return port 10 for connecting the second gear proportional valve 11 with the oil tank 22, and a working oil port 9 for connecting the second gear proportional valve 11 with the second gear clutch 26.

[0034] Furthermore, the valve body 21 is provided with a spring chamber oil return port 1, which is connected to a spring chamber 2 for installing a spring 17. The oil enters the valve body 21 after entering from the main oil inlet 15, and the spring chamber oil return port 1 is the leaked oil, which enters the gearbox oil pan.

[0035] Furthermore, a screw plug 12 is installed on the outer end surface of the valve body 21 corresponding to the pressure regulating valve stem 14, and a screw plug 2 18 is installed on the outer end surface of the valve body 21 corresponding to the spring 17, and a sealing effect is achieved through the screw plug 12 and the screw plug 2 18.

[0036] The working principle of the utility model is:

[0037] The principle of the speed change hydraulic system is as follows Figure 4 As shown, the variable speed pump 23 enters the valve body 21 after oil is taken in through the main oil inlet 15, and passes through uvw. As the pressure rises, the oil passes through the leftmost cavity of the pressure regulating valve stem 14, pushing the pressure regulating valve stem 14 to move right. First, the oil inlet channel 16 is connected with the lubricating oil port 3, and the bearings or gears in the gearbox are lubricated through the lubricating oil port 3. At the same time, the set pressure of uvw is guaranteed, and the excess oil is lubricated. When the pressure regulating valve stem 14 is continuously pushed to move right, the uv oil channel on the oil inlet channel 16 is connected with the oil unloading return port 4 to achieve the purpose of oil unloading, and the oil returns to the gearbox oil pan. When the pressure regulating valve stem 14 is continuously pushed to move right, the control cavity 29 will be opened to return to the oil tank 22, thereby protecting the gearbox system from impact and ensuring that the system pressure is within the set range.

[0038] When the first gear proportional valve 6 is not energized, the first gear proportional valve oil return port 5 is connected with the working oil port 1 7 . When the first gear proportional valve 6 is energized, the first gear proportional valve oil inlet port 30 is connected with the working oil port 1 7 , and the oil enters the first gear clutch 25 .

[0039] When the second-gear proportional valve 11 is not energized, the second-gear proportional valve oil return port 10 is connected to the working oil port 2 9 . When the second-gear proportional valve 11 is energized, the second-gear proportional valve oil inlet port 8 is connected to the working oil port 2 9 , and the oil enters the second-gear clutch 26 .

Claims

1. A variable speed control valve, comprising a valve body (21), a first-gear proportional valve (6) and a second-gear proportional valve (11) being mounted on the valve body (21), a pressure regulating valve (27) being arranged inside the valve body (21), and characterized in that: The upper end of the valve body (21) is provided with a main oil inlet (15) for oil to enter the interior of the valve body (21), and the interior of the valve body (21) is provided with an oil inlet passage 1 (16) connected to the main oil inlet (15) and an oil inlet passage 2 (20) connected to the oil inlet passage 1 (16), and the oil inlet passage 1 (16) is connected to a first-gear proportional valve oil inlet (30) on a first-gear proportional valve (6), and the oil inlet passage 2 (20) is connected to a second-gear proportional valve oil inlet (8) on a second-gear proportional valve (11).

2. The speed control valve according to claim 1, characterized in that: The pressure regulating valve (27) comprises a pressure regulating valve stem (14) arranged inside a valve body (21), and a spring (17) is arranged on one side of the pressure regulating valve stem (14).

3. The speed control valve according to claim 2, characterized in that: The valve body (21) is also provided with a lubricating oil port (3) for lubrication, an oil unloading return port (4) for unloading oil, an oil return chamber (40) connected to the oil unloading return port (4), a spring chamber oil return port (1) for returning oil from the spring chamber (2), and a control chamber (29) for controlling the pressure regulating valve stem (14). When oil is supplied from the main oil inlet (15) and the pressure regulating valve stem (14) is pushed rightward, the oil inlet passage 1 (16) is first connected to the lubricating oil port (3).

4. The speed control valve according to claim 3, characterized in that: The end surface of the valve body (21) is provided with a first-gear proportional valve oil return port (5) for communicating the first-gear proportional valve (6) with the oil tank (22), a first working oil port (7) for communicating the first-gear proportional valve (6) with the first-gear clutch (25), a second-gear proportional valve oil return port (10) for communicating the second-gear proportional valve (11) with the oil tank (22), and a second working oil port (9) for communicating the second-gear proportional valve (11) with the second-gear clutch (26).

5. The speed control valve according to claim 2, characterized in that: The valve body (21) is also provided with a spring chamber oil return port (1), and the spring chamber oil return port (1) is communicated with a spring chamber (2) for installing a spring (17).

6. The speed control valve according to any one of claims 2 to 5, characterized in that: A screw plug 1 (12) is installed on the outer end surface of the valve body (21) corresponding to the pressure regulating valve stem (14), and a screw plug 2 (18) is installed on the outer end surface of the valve body (21) corresponding to the spring (17).

Images