An electrically driven gearbox integrated valve block

Abstract

The application discloses an electric drive gearbox integrated valve block, which comprises a system valve block and an integral end cover assembly. The system valve block is provided with a P oil port and an SP oil port on a valve body, and oil flows into the P oil port and flows out of the SP oil port. The integral end cover assembly is provided with an SP' oil port on an end face, and a C1 electromagnetic valve, a C2 electromagnetic valve and a C3 electromagnetic valve are arranged on one side of the end face. The end face back is respectively provided with an ST3 oil port, an ST4 oil port and an ST5 oil port. The front of the end cover body is further provided with an LP oil port. The back of the end cover body is respectively provided with an H1 shaft groove, an H2 shaft groove and an H3 shaft groove, and the top surfaces of the H1 shaft groove, the H2 shaft groove and the H3 shaft groove are respectively provided with an LA1 oil port, an LA2 oil port and an LA3 oil port. The back of the end cover body is further provided with an HT oil return cavity, and the ST3 oil port, the ST4 oil port and the ST5 oil port are arranged in the HT oil return cavity. The application meets the hydraulic system control, saves a large amount of external pipelines, and has the advantages of simple structure, low cost and easy installation.

Description

Technical Field

[0001] This invention relates to an integrated valve block for an electric drive gearbox, belonging to the field of hydraulic valve technology. Background Technology

[0002] Integrated hydraulic shift control valves are widely used in the gearboxes of construction machinery such as loaders and graders due to their concentrated functions and compact structure.

[0003] Existing integrated hydraulic shift control valve groups are mainly composed of a main valve body, an upper partition, an oil supply plate, and a lower partition stacked from top to bottom. The main valve body includes a main pressure valve, a proportional pressure reducing valve, and a valve body. For parallel shaft gearboxes, if existing integrated valve block technology is used, a large number of external oil pipes and shaft end caps need to be designed. The oil from the integrated valve block passes through the oil pipes and then enters the shaft through the shaft end caps to work.

[0004] For newly developed electric drive multi-speed gearboxes for construction machinery, existing technologies cannot meet the requirements in terms of either functionality or space utilization, given the characteristics of the shaft system structure and the need for lightweighting.

[0005] Therefore, those skilled in the art urgently need to improve existing integrated hydraulic shift control valves to meet the requirements of electric drive transmissions. Summary of the Invention

[0006] Objective: In order to overcome the shortcomings of the existing technology, the present invention provides an integrated valve block for electric drive gearbox. The valve block integrates an integral end cap and a system valve block, which can meet the control of hydraulic system while saving a lot of external pipelines. It is also simple in structure, low in cost and easy to install.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] An integrated valve block for an electric drive gearbox, characterized in that it comprises: a system valve block and an integral end cap assembly.

[0009] The system valve block includes a valve body, which is provided with a P oil port and an SP oil port. When oil flows into the P oil port, it flows out from the SP oil port.

[0010] The integral end cap assembly includes: an end cap body, an end face of which is connected to the system valve block, and an SP' oil port on the end face; a C1 solenoid valve, a C2 solenoid valve, and a C3 solenoid valve are provided on one side of the end face.

[0011] The back of the end face is provided with ST3 oil port, ST4 oil port and ST5 oil port respectively.

[0012] The end cap body also has an LP oil port on its front side.

[0013] The back of the end cap is provided with H1 shaft groove, H2 shaft groove and H3 shaft groove respectively, and the top surface of H1 shaft groove, H2 shaft groove and H3 shaft groove is provided with LA1 oil port, LA2 oil port and LA3 oil port respectively.

[0014] The back of the end cap is also provided with an HT oil return chamber, and the ST3 oil port, ST4 oil port and ST5 oil port are located in the HT oil return chamber.

[0015] The SP' oil port is connected to the SP oil port. The C1, C2, and C3 solenoid valves are all equipped with P, A, and T ports. The oil flowing into the SP' oil port is connected to the P ports of the C1, C2, and C3 solenoid valves respectively through the first oil circuit. When the solenoid valve is working, the P port is opened, and the oil pressure regulated by the solenoid valve flows out through the A port of the solenoid valve.

[0016] The second, third, and fourth oil passages are respectively connected to the A ports of solenoid valves C1, C2, and C3. One end of the second, third, and fourth oil passages is set on the end face surface and is equipped with a plug. The other end of the second, third, and fourth oil passages is respectively connected to one end of the fifth, sixth, and seventh oil passages. The other end of the fifth oil passage is connected to the H1 shaft groove through the SA1 oil port, the other end of the sixth oil passage is connected to the H2 shaft groove through the SA2 oil port, and the other end of the seventh oil passage is connected to the H3 shaft groove through the SA3 oil port.

[0017] When the solenoid valve is not working, port P is closed, and ports T of solenoid valves C1, C2, and C3 are connected to port A respectively. Ports T of solenoid valves C1, C2, and C3 are connected to ports ST3, ST4, and ST5 in the HT return oil chamber respectively through the oil circuit.

[0018] The LP oil port is connected to one end of the eighth oil circuit, the eighth oil circuit is connected to the first common oil circuit, the other end of the eighth oil circuit is provided with the LA1 oil port, the other end of the first common oil circuit is connected to one end of the second common oil circuit through the ninth oil circuit, the other end of the ninth oil circuit is provided with the LA2 oil port, the other end of the second common oil circuit is connected to the tenth oil circuit, the other end of the tenth oil circuit is provided with the LA3 oil port.

[0019] Furthermore, it also includes a sealing gasket, wherein the system valve block, the integral end cap assembly, and the sealing gasket are connected in sequence by bolts.

[0020] Furthermore, the valve body is also provided with a T1 oil port, a first valve core is provided inside the valve body, a second valve core is movably connected to one end of the first valve core, and a spring is sleeved on the free end of the second valve core.

[0021] Furthermore, the system valve block is also equipped with a T2 oil port.

[0022] Furthermore, when the oil pressure flowing into the system valve block P port exceeds a certain value, the first valve core pushes the second valve core to compress the spring, and the P port connects with the T1 port, allowing the oil to overflow and flow out through the T1 port.

[0023] Furthermore, when the oil pressure flowing into the system valve block P port exceeds a certain value, the first valve core pushes the second valve core to compress the spring, and a small amount of oil leaking into the spring cavity is discharged through the T2 port.

[0024] Furthermore, a T2' oil port is provided on the end face, and a T2'' oil port is also provided on the back side of the end face. The T2'' oil port is located in the HT oil return chamber. The T2'' oil port is connected to the T2'' oil port through an oil passage.

[0025] Furthermore, a pressure sensor is provided on the valve body.

[0026] Furthermore, a temperature sensor is installed on the valve body.

[0027] Furthermore, it also includes a filter bypass valve, which includes: an SPP' oil port, a spring cavity port, and an overflow port. The end cap body is also provided with an SPP oil port. The oil flowing into the SPP oil port flows into the SPP' oil port of the filter bypass valve. The spring cavity port is connected to the first oil circuit through an eleventh oil circuit. The overflow port is connected to the first open oil circuit through a twelfth oil circuit.

[0028] Beneficial effects: The integrated valve block for an electric drive gearbox provided by this invention has the following advantages compared with the prior art:

[0029] (1) The present invention provides an integrated valve block for electric drive fully automatic transmission that directly delivers working pressure oil and lubricating oil to a designated shaft end.

[0030] (2) It integrates the functions of gearbox gear control, integrated end cover, filter safety valve and lubricant distribution.

[0031] (3) The integral end cover is equipped with high pressure oil circuit, lubricating oil circuit and filter safety valve oil circuit. High pressure oil and lubricating oil directly enter the shaft core oil passage through the integral end cover.

[0032] (4) The integrated valve block has a simple structure and low cost. It reduces external piping and optimizes installation space. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the integrated valve block assembly structure of an electric drive gearbox.

[0034] Figure 2 This is a schematic diagram of an integrated valve block assembly.

[0035] Figure 3 This is a schematic diagram of the front structure of the system valve block.

[0036] Figure 4 This is a schematic diagram of the cross-sectional structure of the system valve block.

[0037] Figure 5 This is a front view of the integral end cap assembly.

[0038] Figure 6 This is a schematic diagram of the back of the integral end cap assembly.

[0039] Figure 7 This is a side sectional view of the integral end cap assembly.

[0040] Figure 8 This is a schematic diagram of the FF cross-section of the C1 solenoid valve.

[0041] Figure 9 This is a schematic diagram of the BB cross-section of the end cap.

[0042] Figure 10 This is a schematic diagram of the CC section of the end cap.

[0043] Figure 11 This is a schematic diagram of the filter bypass valve.

[0044] Figure 12 is a schematic diagram of the fit between a certain shaft groove and the gearbox shaft. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0046] The present invention will be further described below with reference to specific embodiments.

[0047] like Figure 1-2 As shown, an integrated valve block for an electric drive gearbox includes: a system valve block 1, an integral end cover assembly 2, and a sealing gasket 3. The system valve block 1, the integral end cover assembly 2, and the sealing gasket 3 are connected sequentially by bolts.

[0048] like Figure 3 , 4As shown, the system valve block 1 includes a valve body 101, on which are provided a P port 102, a T1 port 103, an SP port 104, and a T2 port 105. A first valve core 106 is disposed within the valve body 101, and a second valve core 107 is movably connected to one end of the first valve core 106. A spring 108 is sleeved on the free end of the second valve core 107. When oil flows into the P port 102, the oil flows out through the SP port 104.

[0049] Furthermore, in one embodiment, when the oil pressure flowing into port P 102 exceeds a certain value, the first valve core 106 pushes the second valve core 107 to compress the spring. Port P 102 is connected to port T1 103, and most of the oil overflows and flows out through port T1 103. A small amount of oil leaking into the spring cavity is discharged through port T2 105.

[0050] A pressure sensor 109 is provided on the valve body 101 to measure the pressure in the oil passage between the P port 102 and the SP port 104.

[0051] A temperature sensor 110 is provided on the valve body 101 for measuring the temperature inside the valve body 101.

[0052] like Figure 5 As shown, the integral end cap assembly 2 includes: an end cap body 201, on which an end face 202 is provided that is connected to the system valve block 1; the end face 202 is provided with an SP' oil port 203 and a T2' oil port 204. A C1 solenoid valve 205, a C2 solenoid valve 206, and a C3 solenoid valve 207 are provided on one side of the end face 202. Figure 6 As shown, the back side of the end face 202 is provided with oil port ST3 208, oil port ST4 209, oil port ST5 210 and oil port T2'' 211 respectively.

[0053] The end cap 201 is also provided with an LP oil port 212 on its front side.

[0054] The back of the end cap 201 is provided with H1 shaft groove 213, H2 shaft groove 214 and H3 shaft groove 215 respectively, and the top surfaces of H1 shaft groove 213, H2 shaft groove 214 and H3 shaft groove 215 are provided with LA1 oil port 216, LA2 oil port 217 and LA3 oil port 218 respectively.

[0055] The back of the end cap 201 is also provided with an HT oil return chamber 219, and the ST3 oil port 208, ST4 oil port 209, ST5 oil port 210 and T2'' oil port 211 are located in the HT oil return chamber 219.

[0056] like Figure 5 , 7As shown, taking the C1 solenoid valve 205 as an example, a cross-section of the SP' oil port 203 is obtained, resulting in cross-sectional view FF. Cross-sections are then taken of the top and bottom surfaces of the end cap 201, resulting in cross-sectional views BB and CC of the end cap 201.

[0057] like Figure 9 As shown, the SP' oil port 203 is connected to the SP' oil port 104. The oil flowing into the SP' oil port 203 is connected to the P port of the C1 solenoid valve 205, C2 solenoid valve 206, and C3 solenoid valve 207 respectively via the first oil passage 220. The C1 solenoid valve 205, C2 solenoid valve 206, and C3 solenoid valve 207 are all provided with a P port, an A port, and a T port. When the solenoid valve is working, the P port is open, and the oil pressure regulated by the solenoid valve flows out through the A port of the solenoid valve.

[0058] like Figure 10 As shown, the second oil passage 221, the third oil passage 222, and the fourth oil passage 223 are respectively connected to the A ports of solenoid valves C1 205, C2 206, and C3 207. One end of the second oil passage 221, the third oil passage 222, and the fourth oil passage 223 is disposed on the surface of end face 202 and is provided with a plug. The other end of the second oil passage 221, the third oil passage 222, and the fourth oil passage 223 is respectively connected to one end of the fifth oil passage 224, the sixth oil passage 225, and the seventh oil passage 226. The other end of the fifth oil passage 224 is connected to the H1 shaft groove 213 through oil port SA1 227; the other end of the sixth oil passage 225 is connected to the H2 shaft groove 214 through oil port SA2 228; and the other end of the seventh oil passage 226 is connected to the H3 shaft groove 215 through oil port SA3 229.

[0059] When the solenoid valve is not working, port P is closed. The T ports of solenoid valves C1 205, C2 206, and C3 207 are connected to port A respectively. The T ports of solenoid valves C1 205, C2 206, and C3 207 are connected to ports ST3 208, ST4 209, and ST5 210 in the HT return oil chamber 219 respectively through the oil circuit.

[0060] like Figure 8 As shown, the P port of solenoid valve C1 205 is connected to the first oil passage 220, through which liquid oil flows. When solenoid valve C1 205 is working, the liquid oil at port P flows into the fifth oil passage 224 via port A. When solenoid valve C1 205 is not working, the liquid oil in the fifth oil passage 224 flows from port A to port T and from port ST3 208 into the HT return oil chamber 219.

[0061] The LP port 212 is connected to one end of the eighth oil passage 230, which is connected to the first common oil passage 231. The other end of the eighth oil passage 230 is provided with the LA1 port 216. The other end of the first common oil passage 231 is connected to one end of the second common oil passage 233 through the ninth oil passage 232. The other end of the ninth oil passage 232 is provided with the LA2 port 217. The other end of the second common oil passage 233 is connected to the tenth oil passage 234, and the other end of the tenth oil passage 234 is provided with the LA3 port 218.

[0062] In another embodiment, the T2' oil port 204 is connected to the T2'' oil port 211 via an oil passage.

[0063] like Figure 11 As shown, in a further embodiment, a filter bypass valve 235 is also included. The filter bypass valve 235 includes: an SPP' oil port 2351, a spring cavity port 2352, and an overflow port 2353. An SPP oil port 236 is also provided on the front side of the end cap 201. The oil flowing into the SPP oil port 236 flows into the SPP' oil port 2351 of the filter bypass valve 235. The spring cavity port 2352 is connected to the first oil passage 220 through the eleventh oil passage 237. The overflow port 2353 is connected to the first open oil passage 231 through the twelfth oil passage 238. Example

[0064] like Figure 12 As shown, before using the integrated valve block of the electric drive gearbox, the integral end cover assembly is fitted with the gearbox housing and sealed with a gasket, and the edges are fixed with bolts. The three shafts 4 of the gearbox housing extend out of the housing and into the H1 shaft groove, H2 shaft groove, and H3 shaft groove of the integral end cover assembly. The three shafts 4 are C1 shaft, C2 shaft, and C3 shaft, respectively. The three high-pressure oil inlets on the sides of the C1 shaft, C2 shaft, and C3 shaft are connected to the SA1 oil port 227, SA2 oil port 228, and SA3 oil port 229 on the sides of the H1 shaft groove, H2 shaft groove, and H3 shaft groove, respectively. The three lubricating oil inlets on the top of the C1 shaft, C2 shaft, and C3 shaft are connected to the LA1 oil port 216, LA2 oil port 217, and LA3 oil port 218 on the top of the H1 shaft groove, H2 shaft groove, and H3 shaft groove, respectively.

[0065] During operation, the high-pressure oil from the transmission pump is filtered by the filter and then enters through the P port of the system valve block and flows out through the SP port. The high-pressure oil flowing in from the SP port enters the first oil passage 220 of the integral end cover assembly. The first oil passage 220 is connected to the P ports of solenoid valves C1 205, C2 206, and C3 207 respectively.

[0066] When the solenoid valve is working, port P opens, and the oil pressure regulated by the solenoid valve flows out through port A of the solenoid valve and flows into the second oil passage 221, the third oil passage 222 and the fourth oil passage 223 respectively, and then into the fifth oil passage 224, the sixth oil passage 225 and the seventh oil passage 226 respectively. Then, through the end oil port SA1 227, oil port SA2 228 and oil port SA3 respectively, they flow into the high-pressure oil inlet on the side of the C1 shaft, C2 shaft and C3 shaft respectively, and flow into the high-pressure oil passage to enter the clutch housing, driving the clutch to work.

[0067] When the solenoid valve stops working, port P is closed, and no high-pressure oil enters the solenoid valve. The oil in the clutch chamber returns to port A of the solenoid valve through the oil circuit. Port A of the solenoid valve is connected to port T. The oil flows into the HT return oil chamber through ports T of solenoid valves C1 205, C2 206, and C3 207, through oil circuits, and through ports ST3 208, ST4 209, and ST5 210. The HT return oil chamber is closed on the gearbox housing. There are oil ports on the gearbox housing, and the return oil flows back to the housing through the oil ports.

[0068] The oil returning from the cooler enters the internal lubrication circuit of the integral end cover assembly through the LP port. The oil flows into the lubrication channels of the C1, C2, and C3 shafts through the LA1 port 216, LA2 port 217, and LA3 port 218, respectively, and enters the shaft lubrication circuit to lubricate the components on the shaft.

[0069] When the pressure of the high-pressure oil flowing into the P port of the system valve block exceeds a certain value, most of the oil overflows and flows out through the T1 port. After that, it flows into the radiator through the external pipeline for heat dissipation and then enters the integral end cover assembly through the LP port via the external oil pipe.

[0070] A small amount of oil leaking into the system valve block spring chamber is discharged through the T2 port, and flows into the HT return oil chamber through the T2' port on the integral end cover assembly.

[0071] The filter bypass valve is a differential pressure valve. Oil flowing from the SPP port of the end cover into the SPP' port of the filter bypass valve originates from the oil path before the filter. Oil flowing from the SP' port through the first and eleventh oil paths into the spring chamber comes from the oil path after the filter. When the internal resistance of the filter is less than 4.5 bar, the oil in the oil paths connecting the SPP' port and the spring chamber is static. When the internal resistance of the filter reaches 4.5 bar, the oil pressure at the SPP' port is 4.5 bar higher than the oil pressure at the spring chamber, causing the valve core to compress the spring. The SPP' port then connects to the overflow port, allowing oil to enter the lubrication system through the twelfth and first open oil paths.

[0072] When the internal resistance of the filter exceeds 4.5 bar, the filter's filtration capacity decreases. To ensure the cleanliness of the hydraulic system oil and protect solenoid valves C1, C2, and C3, a filter bypass is designed.

[0073] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An integrated valve block for an electric drive gearbox, characterized in that: include: System valve block (1), integral end cap assembly (2); The system valve block (1) includes: a valve body (101), which is provided with a P oil port (102) and an SP oil port (104). When oil flows into the P oil port (102), it flows out from the SP oil port (104). The integral end cap assembly (2) includes: an end cap body (201), an end face (202) of the end cap body (201) and the system valve block (1) are provided, and an SP' oil port (203) is provided on the end face (202); a C1 solenoid valve (205), a C2 solenoid valve (206) and a C3 solenoid valve (207) are provided on one side of the end face (202); The back of the end face (202) is provided with ST3 oil port (208), ST4 oil port (209) and ST5 oil port (210); The end cap body (201) is also provided with an LP oil port (212) on the front side. The back of the end cap (201) is provided with H1 shaft groove (213), H2 shaft groove (214) and H3 shaft groove (215), and the top surfaces of H1 shaft groove (213), H2 shaft groove (214) and H3 shaft groove (215) are respectively provided with LA1 oil port (216), LA2 oil port (217) and LA3 oil port (218); The end cap body (201) is also provided with an HT oil return chamber (219) on the back side, and the ST3 oil port (208), ST4 oil port (209), and ST5 oil port (210) are located in the HT oil return chamber (219); The SP' oil port (203) is connected to the SP oil port (104). The C1 solenoid valve (205), C2 solenoid valve (206), and C3 solenoid valve (207) are all provided with P port, A port, and T port. The oil flowing into the SP' oil port (203) is connected to the P port of the C1 solenoid valve (205), C2 solenoid valve (206), and C3 solenoid valve (207) respectively through the first oil circuit (220). When the solenoid valve is working, the P port is opened, and the oil after pressure regulation by the solenoid valve flows out through the A port of the solenoid valve. The second oil passage (221), the third oil passage (222), and the fourth oil passage (223) are respectively connected to the A ports of solenoid valves C1 (205), C2 (206), and C3 (207). One end of the second oil passage (221), the third oil passage (222), and the fourth oil passage (223) is set on the end face (202) and is provided with a plug; the other end of the second oil passage (221), the third oil passage (222), and the fourth oil passage (223) are respectively connected to the A ports of solenoid valves C1 (205), C2 (206), and C3 (207). It is not connected to one end of the fifth oil passage (224), the sixth oil passage (225), or the seventh oil passage (226); the other end of the fifth oil passage (224) is connected to the H1 shaft groove (213) through the SA1 oil port (227), the other end of the sixth oil passage (225) is connected to the H2 shaft groove (214) through the SA2 oil port (228), and the other end of the seventh oil passage (226) is connected to the H3 shaft groove (215) through the SA3 oil port (229); When the solenoid valve is not working, port P is closed, and ports T of solenoid valves C1 (205), C2 (206), and C3 (207) are connected to port A respectively. Ports T of solenoid valves C1 (205), C2 (206), and C3 (207) are connected to ports ST3 (208), ST4 (209), and ST5 (210) in the HT return oil chamber (219) through oil circuits respectively. The LP oil port (212) is connected to one end of the eighth oil line (230), the eighth oil line (230) is connected to the first common oil line (231), the other end of the eighth oil line (230) is provided with the LA1 oil port (216), the other end of the first common oil line (231) is connected to one end of the second common oil line (233) through the ninth oil line (232), the other end of the ninth oil line (232) is provided with the LA2 oil port (217), the other end of the second common oil line (233) is connected to the tenth oil line (234), the other end of the tenth oil line (234) is provided with the LA3 oil port (218); The valve body (101) is also provided with a T1 oil port (103), and a first valve core (106) is provided inside the valve body (101). A second valve core (107) is movably connected to one end of the first valve core (106), and a spring (108) is sleeved on the free end of the second valve core (107). The system valve block (1) is also provided with a T2 oil port (105); When the oil pressure flowing into the P port (102) of the system valve block (1) exceeds a certain value, the first valve core (106) pushes the second valve core (107) to move and compress the spring, the P port (102) is connected to the T1 port (103), and the oil overflows and flows out through the T1 port (103); When the oil pressure flowing into the oil through the P port (102) of the system valve block (1) exceeds a certain value, the first valve core (106) pushes the second valve core (107) to compress the spring, and a small amount of oil leaking into the spring cavity is discharged through the T2 port (105). The end face (202) is also provided with a T2' oil port (204), and the back side of the end face (202) is also provided with a T2'' oil port (211). The T2'' oil port (211) is located in the HT return oil chamber (219). The T2'' oil port (204) is connected to the T2'' oil port (211) through an oil passage. It also includes a filter bypass valve (235), which includes: an SPP' oil port (2351), a spring cavity port (2352), and an overflow port (2353). The end cap body (201) is also provided with an SPP oil port (236) on the front side. The oil flowing into the SPP oil port (236) flows into the SPP' oil port (2351) of the filter bypass valve (235). The spring cavity port (2352) is connected to the first oil circuit (220) through the eleventh oil circuit (237). The overflow port (2353) is connected to the first common oil circuit (231) through the twelfth oil circuit (238).

2. The integrated valve block for an electric drive gearbox according to claim 1, characterized in that: Also includes: The sealing gasket (3), the system valve block (1), the integral end cap assembly (2), and the sealing gasket (3) are connected in sequence by bolts.

3. The integrated valve block for an electric drive gearbox according to claim 1, characterized in that: A pressure sensor (109) is provided on the valve body (101).

4. The integrated valve block for an electric drive gearbox according to claim 1, characterized in that: A temperature sensor (110) is provided on the valve body (101).

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