Pneumatic interlocking mechanism for transfer case

Abstract

The pneumatic interlocking mechanism comprises a transfer case body, a two-position five-way valve, a high-low gear air cylinder, a high gear air inlet pipe, a low gear air inlet pipe, a four-wheel-drive two-wheel-drive air cylinder, a two-wheel-drive air inlet pipe and a four-wheel-drive air inlet pipe. When no high-pressure gas exists in the control gas source gas inlet, the driving gas source gas inlet is communicated with the first output port, and the second output port is communicated with the second exhaust port, so that the high-low gear cylinder is switched to the high gear, and the four-drive and two-drive cylinder is switched to the two-drive. The two-position five-way valve can control the high-gear and low-gear air cylinder and the four-gear and two-gear air cylinder at the same time, it is guaranteed that the transfer case can only be in the high-gear and two-gear safety mode or the low-gear and four-gear safety mode according to the air path principle, and the situation that a gearbox and a rear axle of a vehicle are damaged due to the fact that a driver operates by mistake in unreasonable modes such as the high-gear and four-gear safety mode or the low-gear and two-gear safety mode is avoided; and the running safety of the vehicle and the reliability of a transmission system are improved.

Description

Technical Field

[0001] This invention belongs to the field of vehicle transfer case technology, and specifically relates to a pneumatic interlock mechanism for a transfer case. Background Technology

[0002] With the development of commercial vehicles in my country, especially in mountainous areas such as Yunnan, Guizhou and Sichuan, the demand for vehicle power performance is increasing. Four-wheel drive vehicles can significantly improve vehicle power without increasing engine power, and the transfer case is the core component for realizing the four-wheel drive or all-wheel drive function of the vehicle.

[0003] In practical applications, the target transfer case has the following problems: the high and low gear functions and the two-wheel drive and four-wheel drive functions of the transfer case lack an interlock mechanism, which makes it very easy for users to operate it incorrectly and damage the vehicle's transmission and rear axle. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pneumatic interlock mechanism for a transfer case. In this device, a two-position five-way valve can simultaneously control the high and low gear cylinders and the four-wheel drive and two-wheel drive cylinders. From the perspective of air circuit principle, it ensures that the transfer case can only be in the two safe modes of high-gear two-wheel drive or low-gear four-wheel drive. This prevents the driver from accidentally operating the vehicle in an unreasonable mode such as high-gear four-wheel drive or low-gear two-wheel drive, which could damage the vehicle's transmission and rear axle, thereby improving the safety of vehicle driving and the reliability of the transmission system.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pneumatic interlock mechanism for a transfer case includes a transfer case body, a two-position five-way valve, a high-speed and low-speed cylinder, a high-speed intake pipe, a low-speed intake pipe, a four-wheel drive and a two-wheel drive cylinder, a two-wheel drive intake pipe, and a four-wheel drive intake pipe. The high and low gear cylinders are mounted on the transfer case body, and are provided with a high gear air inlet and a low gear air inlet. The four-wheel drive and two-wheel drive cylinders are mounted on the transfer case body, which is provided with a two-wheel drive air intake and a four-wheel drive air intake. The two-position five-way valve has a drive air source inlet, a control air source inlet, a first output port, a second output port, a first exhaust port, and a second exhaust port; The drive air source inlet is connected to a high-pressure air source; The control air source inlet is connected to a switch in the cab and is used to control the on / off state of the high-pressure air source. The two ends of the high-speed intake pipe are respectively connected to the first output port of the two-position five-way valve and the high-speed intake port of the high-low speed cylinder; the two ends of the low-speed intake pipe are respectively connected to the second output port and the low-speed intake port of the high-low speed cylinder. The two ends of the two-wheel drive intake pipe are respectively connected to the two-wheel drive intake port on the four-wheel drive cylinder and the first output port on the two-position five-way valve; the two ends of the four-wheel drive intake pipe are respectively connected to the four-wheel drive intake port on the four-wheel drive cylinder and the second output port on the two-position five-way valve. When there is no high-pressure gas at the air source inlet, the air source inlet is connected to the first output and the second output is connected to the second exhaust port, so that the high and low gear cylinders switch to high gear and the four-wheel drive and two-wheel drive cylinders switch to two-wheel drive. When there is high-pressure gas at the air inlet of the control air source, the air inlet of the drive air source is connected to the second output port, and the first output port is connected to the first exhaust port, so that the high and low gear cylinders switch to low gear, and the four-wheel drive and two-wheel drive cylinders switch to four-wheel drive.

[0006] Preferably, it also includes a bracket, which is mounted on the transfer case body, and the two-position five-way valve is mounted on the bracket. The bracket provides a stable mounting base for the two-position five-way valve, effectively preventing the valve body from loosening or shifting due to vibration and impact during vehicle operation, ensuring accurate operation of its internal valve core, and extending its service life.

[0007] Preferably, a three-way connector is provided at both the first and second output ports of the two-position five-way valve. The three-way connector distributes the airflow from one output port to two actuators. For example, the first output port can supply both the high gear and the two drives at the same time. This eliminates the need for additional connecting parts and complex pipeline branch designs, simplifies the assembly process, and improves the assembly efficiency of the production line.

[0008] Preferably, the tee connector at the first output port is connected to the first output port, and the other two connection ports of the tee connector are respectively connected to the high-gear air intake pipe and the two-wheel drive air intake pipe. The tee connector distributes the airflow of one output port to two actuators. For example, the first output port supplies both high-gear and two-wheel drive at the same time, eliminating the need for additional connectors and complex pipeline branch designs, simplifying the assembly process, and improving the assembly efficiency of the production line. When there is high-pressure gas at the first output port, the high-pressure gas will simultaneously reach the high-gear air intake port of the high-gear cylinder and the two-wheel drive air intake port of the four-wheel drive and two-wheel drive cylinders, forcing the two cylinders to operate simultaneously, so that the transfer case will inevitably enter the high-gear two-wheel drive mode. Together with the connection of the second output port, it forms a complete and reliable start-up interlock structure.

[0009] Preferably, the T-connector at the second output port is connected to the second output port, and the other two connection ports of the T-connector are respectively connected to the low-gear air intake pipe and the four-wheel drive air intake pipe. When there is high-pressure gas at the second output port, the high-pressure gas will be supplied to the low-gear air intake port and the four-wheel drive air intake port at the same time, forcing the transfer case to enter the low-gear four-wheel drive mode. Together with the connection of the first output port, it forms a complete and reliable pneumatic interlock structure.

[0010] Preferably, a straight pipe connector is provided at one of the interfaces of the tee connector. The straight pipe connector on the tee connector is connected to the high-end air intake pipe or the low-end air intake pipe. By setting the straight pipe connector, the direction of the air pipe can be flexibly adjusted according to the actual space around the engine compartment or transfer case. This can effectively avoid friction, interference or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0011] Preferably, a bend pipe connector is provided at another interface on the tee connector. The bend pipe connector is connected to the two-wheel drive air intake pipe or the four-wheel drive air intake pipe respectively. By using the bend pipe connector, the direction of the air pipe can be flexibly adjusted according to the actual space around the engine compartment or transfer case, effectively avoiding friction, interference or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0012] Preferably, high-gear and low-gear intake pipe connectors are provided at the high-gear and low-gear intake ports of the high-gear and low-gear cylinders, respectively, and two-wheel drive and four-wheel drive intake pipe connectors are provided at the two-wheel drive and four-wheel drive intake ports of the four-wheel drive and two-wheel drive cylinders, respectively. The provision of these high-gear, low-gear, two-wheel drive, and four-wheel drive intake pipe connectors provides a standard and robust connection point, ensuring the sealing and vibration resistance of the connection between the high-gear and low-gear intake pipes and the high-gear and low-gear cylinders, and ensuring the sealing and vibration resistance of the connection between the two-wheel drive and four-wheel drive intake pipe connectors and the four-wheel drive and two-wheel drive cylinders, thus facilitating daily maintenance and pipe replacement.

[0013] Preferably, a drive air source inlet pipe connector is provided at the control air source inlet of the two-position five-way valve, which ensures that the control air source pipeline from the switch in the cab can be stably and reliably connected to the two-position five-way valve, and ensures that the entire interlock system can correctly receive the driver's commands.

[0014] Preferably, the pressure of the high-pressure air source connected to the air intake of the drive air source is 0.8 to 1 MPa, which ensures that the high and low gear cylinders and the four-wheel drive and two-wheel drive cylinders can obtain sufficient pressure to overcome internal resistance and quickly, accurately and reliably complete the gear and drive mode switching action, avoiding switching failure or incomplete switching due to insufficient pressure.

[0015] The beneficial effects of this invention are: 1) The two-position five-way valve in this device can simultaneously control the high and low gear cylinders and the four-wheel drive and two-wheel drive cylinders. From the perspective of air circuit principle, it ensures that the transfer case can only be in the two safe modes of high gear two-wheel drive or low gear four-wheel drive. This prevents the driver from accidentally operating the vehicle in an unreasonable mode such as high gear four-wheel drive or low gear two-wheel drive, which could damage the vehicle's gearbox and rear axle, thus improving the safety of vehicle driving and the reliability of the transmission system.

[0016] 2) The bracket of this device provides a stable installation base for the two-position five-way valve, effectively preventing the valve body from loosening or shifting due to vibration and impact during vehicle operation, ensuring accurate operation of its internal valve core, and extending its service life.

[0017] 3) The three-way connector of this device distributes the airflow from one output port to two actuators. For example, the first output port can supply both the high gear and the two drives at the same time, eliminating the need for additional connectors and complex pipeline branch designs, simplifying the assembly process and improving the assembly efficiency of the production line.

[0018] 4) This device, through the setting of the straight pipe joint, can flexibly adjust the direction of the air pipe according to the actual space around the engine compartment or transfer case, which can effectively avoid friction, interference or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0019] 5) By using elbow pipe joints, this device can flexibly adjust the direction of the air pipe according to the actual space around the engine compartment or transfer case, effectively avoiding friction, interference or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0020] 6) The high-gear intake pipe connector, low-gear intake pipe connector, two-wheel drive intake pipe connector, and four-wheel drive intake pipe connector of this device provide a standard and robust connection point, ensuring the sealing and vibration resistance of the connection between the high-gear and low-gear intake pipes and the high and low-gear cylinders, and ensuring the sealing and vibration resistance of the connection between the two-wheel drive intake pipe connector and the four-wheel drive intake pipe connector and the two-wheel drive cylinders, facilitating daily maintenance and pipe replacement.

[0021] 7) This device is equipped with high-gear air inlet pipe connectors and low-gear air inlet pipe connectors at the high-gear and low-gear air inlets of the high-gear and low-gear cylinders, providing a standard and robust connection point. This ensures the sealing and vibration resistance of the connection between the high-gear and low-gear air inlet pipes and the high-gear and low-gear cylinders, and facilitates daily maintenance and pipe replacement.

[0022] 8) This device is equipped with a drive air source inlet pipe connector at the control air source inlet of the two-position five-way valve, which ensures that the control air source pipeline from the switch in the cab can be stably and reliably connected to the two-position five-way valve, and ensures that the entire interlock system can correctly receive the driver's instructions.

[0023] 9) The high-pressure air source connected to the drive air source inlet of this device has a pressure of 0.8 to 1 MPa, which ensures that the high and low gear cylinders and the four-wheel drive and two-wheel drive cylinders can obtain sufficient pressure to overcome internal resistance and quickly, accurately and reliably complete the gear and drive mode switching action, avoiding switching failure or incomplete switching due to insufficient pressure. Attached Figure Description

[0024] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Appendix Figure 2 This is a schematic diagram of the working principle of the two-position five-way valve in this invention.

[0026] Appendix Figure 3 This is a schematic diagram of the installation structure of the present invention.

[0027] In the picture: 1. Transfer case body; 2. High-gear intake pipe connector; 3. High and low gear cylinders; 4. Low-gear intake pipe connector; 5. High-gear intake pipe; 6. Low-gear intake pipe; 7. Bracket; 8. Two-position five-way valve; 9. Straight pipe connector; 10. T-connector; 11. Elbow pipe connector; 12. Two-wheel drive intake pipe; 13. Four-wheel drive intake pipe; 14. Drive air source intake pipe connector; 15. Control air source intake pipe connector; 16. Two-wheel drive intake pipe connector; 17. Four-wheel drive intake pipe connector; 18. Four-wheel drive and two-wheel drive cylinders; 19. Control air source inlet; 20. Second output port; 21. First output port; 22. First exhaust port; 23. Drive air source inlet; 24. Second exhaust port. Detailed Implementation

[0028] The technical solutions in the embodiments 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 scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] like Figure 1As shown, a pneumatic interlock mechanism for a transfer case includes a transfer case body 1, a two-position five-way valve 8, a high-low gear cylinder 3, a high-gear intake pipe 5, a low-gear intake pipe 6, a four-wheel drive and two-wheel drive cylinder 18, a two-wheel drive intake pipe 12, and a four-wheel drive intake pipe 13. The high and low gear cylinders 3 are mounted on the transfer case body 1, and are provided with a high gear air inlet and a low gear air inlet.

[0031] The four-wheel drive and two-wheel drive cylinders 18 are mounted on the transfer case body 1, which is provided with a two-wheel drive air intake and a four-wheel drive air intake.

[0032] like Figure 2 As shown, the two-position five-way valve 8 has a drive air source inlet 23, a control air source inlet 19, a first output port 21, a second output port 20, a first exhaust port 22, and a second exhaust port 24.

[0033] The drive air source inlet 23 is connected to a high-pressure air source.

[0034] The control air source inlet 19 is connected to the cab switch and is used to control the on / off of the high-pressure air source.

[0035] The two ends of the high-speed intake pipe 5 are respectively connected to the first output port 21 on the two-position five-way valve 8 and the high-speed intake port on the high-low speed cylinder 3. The two ends of the low-speed intake pipe 6 are respectively connected to the second output port 20 and the low-speed intake port on the high-low speed cylinder 3.

[0036] The two ends of the two-wheel drive intake pipe 12 are respectively connected to the two-wheel drive intake port on the four-wheel drive cylinder 18 and the first output port 21 on the two-position five-way valve 8. The two ends of the four-wheel drive intake pipe 13 are respectively connected to the four-wheel drive intake port on the four-wheel drive cylinder 18 and the second output port 20 on the two-position five-way valve 8.

[0037] When there is no high-pressure gas at the control air source inlet 19, the drive air source inlet 23 is connected to the first output, and the second output 20 is connected to the second exhaust 24, so that the high and low gear cylinder 3 switches to high gear and the four-wheel drive and two-wheel drive cylinder 18 switches to two-wheel drive. When there is high-pressure gas at the air source inlet 19, the air source inlet 23 is connected to the second outlet 20, and the first outlet 21 is connected to the first exhaust outlet 22, so that the high and low gear cylinder 3 switches to low gear and the four-wheel drive and two-wheel drive cylinder 18 switches to four-wheel drive.

[0038] In this embodiment, as Figure 1 As shown, it also includes a bracket 7, which is mounted on the transfer case body 1, and the two-position five-way valve 8 is mounted on the bracket 7.

[0039] The bracket 7 provides a stable mounting base for the two-position five-way valve 8, effectively preventing the valve body from loosening or shifting due to vibration and impact during vehicle operation, ensuring accurate operation of its internal valve core, and extending its service life.

[0040] In this embodiment, as Figure 2 As shown, a three-way connector 10 is provided at both the first output port 21 and the second output port 20 of the two-position five-way valve 8.

[0041] The tee connector 10 distributes the airflow from one output port to two actuators, such as the first output port 21 which simultaneously supplies high gear and two drives, eliminating the need for additional connectors and complex pipeline branch designs, simplifying the assembly process and improving the assembly efficiency of the production line.

[0042] In this embodiment, as Figure 1 As shown, the three-way connector 10 at the first output port 21 is connected to the first output port 21, and the other two connection ports of the three-way connector 10 are respectively connected to the high-speed air intake pipe 5 and the two-drive air intake pipe 12. The three-way connector 10 distributes the airflow of one output port to two actuators. For example, the first output port 21 supplies both the high-speed and two-drive components at the same time, eliminating the need for additional connectors and complex pipeline branch designs, simplifying the assembly process, and improving the assembly efficiency of the production line.

[0043] When there is high-pressure gas at the first output port 21, the high-pressure gas will simultaneously reach the high-gear intake port of the high-low gear cylinder 3 and the two-wheel drive intake port of the four-wheel drive and two-wheel drive cylinder 18, forcing these two cylinders to operate simultaneously, so that the transfer case will inevitably enter the "high-gear two-wheel drive" mode. Together with the connection of the second output port 20, it forms a complete and reliable start-up interlock structure.

[0044] In this embodiment, as Figure 1 As shown, the three-way connector 10 at the second output port 20 is connected to the second output port 20, and the other two connection ports of the three-way connector 10 are connected to the low-gear air intake pipe 6 and the four-wheel drive air intake pipe 13, respectively.

[0045] When there is high-pressure gas at the second output port 20, the high-pressure gas will be supplied to the low-gear air intake and the four-wheel drive air intake at the same time, forcing the transfer case to enter the "low-gear four-wheel drive" mode. Together with the connection of the first output port 21, it forms a complete and reliable pneumatic interlock structure.

[0046] In this embodiment, as Figure 1 As shown, a straight pipe connector 9 is provided at one of the interfaces on the tee connector 10. The straight pipe connector 9 on the tee connector 10 is connected to the high-speed air intake pipe 5 or the low-speed air intake pipe 6.

[0047] By using the straight pipe connector 9, the direction of the air pipe can be flexibly adjusted according to the actual space around the engine compartment or transfer case. This effectively avoids friction, interference, or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0048] In this embodiment, as Figure 1 As shown, a bend pipe connector 11 is provided at another interface on the tee connector 10. The bend pipe connector 11 is connected to the two-wheel drive intake pipe 12 or the four-wheel drive intake pipe 13 respectively.

[0049] By using the elbow pipe connector 11, the direction of the air pipe can be flexibly adjusted according to the actual space around the engine compartment or transfer case, effectively avoiding friction, interference or excessive bending between the air pipe and surrounding components, ensuring the safety of the air pipe during operation and extending its service life.

[0050] In this embodiment, as Figure 1 As shown, a high-gear air inlet pipe connector 2 and a low-gear air inlet pipe connector 4 are provided at the high-gear air inlet and low-gear air inlet of the high-gear and low-gear cylinder 3, respectively. The high-gear air inlet pipe connector 2 and the low-gear air inlet pipe connector 4 provide a standard and firm connection point, ensuring the sealing and vibration resistance of the connection between the high-gear air inlet pipe, the low-gear air inlet pipe and the high-gear and low-gear cylinder 3.

[0051] Two-wheel drive air intake connector 16 and four-wheel drive air intake connector 17 are provided at the two-wheel drive air intake port and four-wheel drive air intake port of the four-wheel drive two-wheel drive cylinder 18. The two-wheel drive air intake connector 16 and four-wheel drive air intake connector 17 provide a standard and firm connection point, ensuring the sealing and vibration resistance of the connection between the two-wheel drive air intake connector 16, the four-wheel drive air intake connector 17 and the four-wheel drive two-wheel drive cylinder 18, and facilitating daily maintenance and air pipe replacement.

[0052] In this embodiment, as Figure 1 As shown, a drive air source inlet pipe connector 14 is provided at the control air source inlet 19 of the two-position five-way valve 8, which ensures that the control air source pipeline from the cab switch can be stably and reliably connected to the two-position five-way valve 8, and ensures that the entire interlock system can correctly receive the driver's commands.

[0053] In this embodiment, as Figure 1 As shown, the pressure of the high-pressure air source connected to the driving air source inlet 23 is 0.8 to 1 MPa.

[0054] This ensures that the high and low gear cylinder 3 and the four-wheel drive and two-wheel drive cylinder 18 can obtain sufficient pressure to overcome internal resistance and quickly, accurately and reliably complete the gear and drive mode switching action, avoiding switching failure or incomplete switching due to insufficient pressure.

[0055] When the two-wheel drive function is needed, the switch in the cab of the whole vehicle is turned off, there is no high-pressure gas in the control air source inlet 19 of the two-position five-way valve 8, and the high-pressure gas flows in from the drive air source inlet 23 of the two-position five-way valve 8 and flows out from the first output port 21 of the two-position five-way valve 8. At the same time, the second output port 20 of the two-position five-way valve 8 is connected to the second exhaust port 24 to complete the exhaust. The air flowing from the drive air source inlet 23 of the two-position five-way valve 8 is divided into two paths at the three-way connector 10 of the first output port 21 of the two-position five-way valve 8. One path flows through the high-gear air intake pipe 5 into the high-gear air intake pipe connector 2 of the high-low gear cylinder 3, so that the transfer case is in the high gear. Another airflow flows through the two-wheel drive intake pipe 12 into the two-wheel drive intake pipe connector 16 of the four-wheel drive two-wheel drive cylinder 18, putting the transfer case into two-wheel drive mode. At this time, the transfer case achieves interlocking between the high-gear function and the two-wheel drive function.

[0056] When the four-wheel drive function is needed, the switch in the driver's cab is turned on, and there is high-pressure gas in the control air source inlet 19 of the two-position five-way valve 8, which pushes the internal piston of the two-position five-way valve 8 to move to the left. The high-pressure gas flows in from the drive air source inlet 23 of the two-position five-way valve 8 and flows out from the second output port 20 of the two-position five-way valve 8. At the same time, the first output port 21 of the two-position five-way valve 8 is connected to the first exhaust port 22 to complete the exhaust. The high-pressure gas flowing in from the drive air source inlet 23 of the two-position five-way valve 8 is divided into two paths at the three-way connector 10 of the second output port 20 of the two-position five-way valve 8. One path flows through the low-gear intake pipe 6 and into the low-gear intake pipe connector 4 of the high-low gear cylinder 3, so that the transfer case is in the low gear. Another path flows through the four-wheel drive intake pipe 13 into the four-wheel drive intake pipe connector 17 of the four-wheel drive and two-wheel drive cylinders 18, putting the transfer case into four-wheel drive mode. At this time, the transfer case achieves interlocking between low-gear function and four-wheel drive function.

[0057] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A pneumatic interlock mechanism for a transfer case, comprising a transfer case body, a two-position five-way valve, a high-speed and low-speed cylinder, a high-speed intake pipe, a low-speed intake pipe, a four-wheel drive and a two-wheel drive cylinder, a two-wheel drive intake pipe, and a four-wheel drive intake pipe, characterized in that: The high and low gear cylinders are mounted on the transfer case body, and are provided with a high gear air inlet and a low gear air inlet. The four-wheel drive and two-wheel drive cylinders are mounted on the transfer case body, which is provided with a two-wheel drive air intake and a four-wheel drive air intake. The two-position five-way valve has a drive air source inlet, a control air source inlet, a first output port, a second output port, a first exhaust port, and a second exhaust port; The drive air source inlet is connected to a high-pressure air source; The control air source inlet is connected to a switch in the cab and is used to control the on / off state of the high-pressure air source. The two ends of the high-speed intake pipe are respectively connected to the first output port of the two-position five-way valve and the high-speed intake port of the high-low speed cylinder; the two ends of the low-speed intake pipe are respectively connected to the second output port and the low-speed intake port of the high-low speed cylinder. The two ends of the two-wheel drive intake pipe are respectively connected to the two-wheel drive intake port on the four-wheel drive cylinder and the first output port on the two-position five-way valve. The two ends of the four-wheel drive intake pipe are respectively connected to the four-wheel drive intake port on the four-wheel drive cylinder and the second output port on the two-position five-way valve. When there is no high-pressure gas at the air source inlet, the air source inlet is connected to the first output and the second output is connected to the second exhaust port, so that the high and low gear cylinders switch to high gear and the four-wheel drive and two-wheel drive cylinders switch to two-wheel drive. When there is high-pressure gas at the air inlet of the control air source, the air inlet of the drive air source is connected to the second output port, and the first output port is connected to the first exhaust port, so that the high and low gear cylinders switch to low gear, and the four-wheel drive and two-wheel drive cylinders switch to four-wheel drive.

2. The pneumatic interlock mechanism for a transfer case according to claim 1, characterized in that, It also includes a bracket, which is mounted on the transfer case body, and the two-position five-way valve is mounted on the bracket.

3. The pneumatic interlock mechanism for a transfer case according to claim 2, characterized in that, A three-way connector is provided at both the first and second output ports of the two-position five-way valve.

4. A pneumatic interlock mechanism for a transfer case according to claim 3, characterized in that, The three-way connector at the first output port is connected to the first output port, and the other two connection ports of the three-way connector are respectively connected to the high-speed air intake pipe and the two-wheel drive air intake pipe.

5. A pneumatic interlock mechanism for a transfer case according to claim 3, characterized in that, The tee connector at the second output port is connected to the second output port, and the other two connectors of the tee connector are connected to the low-speed intake pipe and the four-wheel drive intake pipe, respectively.

6. A pneumatic interlock mechanism for a transfer case according to claim 3 or 4, characterized in that, A straight pipe connector is provided at one of the interfaces of the tee connector, and the straight pipe connector on the tee connector is connected to the high-speed air intake pipe or the low-speed air intake pipe.

7. A pneumatic interlock mechanism for a transfer case according to claim 3 or 4, characterized in that, An elbow pipe connector is provided at another interface on the tee connector, which is connected to the intake pipe of the two-wheel drive or the intake pipe of the four-wheel drive.

8. A pneumatic interlock mechanism for a transfer case according to claim 1, characterized in that, High-gear air intake pipe connectors and low-gear air intake pipe connectors are provided at the high-gear air intake port and the low-gear air intake port of the high-gear and low-gear cylinders, respectively. Two-wheel drive air intake pipe connectors and four-wheel drive air intake pipe connectors are provided at the two-wheel drive air intake port and four-wheel drive air intake port of the four-wheel drive and two-wheel drive cylinders.

9. A pneumatic interlock mechanism for a transfer case according to claim 2, characterized in that, A drive air source inlet pipe connector is provided at the control air source inlet of the two-position five-way valve.

10. A pneumatic interlock mechanism for a transfer case according to claim 1, characterized in that, The pressure of the high-pressure air source connected to the air inlet of the driving air source is 0.8 to 1 MPa.

Images