Electrically-controlled pneumatic gear shifting device of transfer case, vehicle transfer case and vehicle

Abstract

The utility model provides a transfer case electric control pneumatic gear shifting device, a vehicle transfer case and a vehicle, which comprises three gear shifting cylinders respectively corresponding to three different gears of the vehicle transfer case; a high-gear electromagnetic valve, a neutral-gear electromagnetic valve and a low-gear electromagnetic valve are installed on the valve body in an inserted mode, a main air inlet is formed in the valve body, and the high-gear electromagnetic valve, the neutral-gear electromagnetic valve and the low-gear electromagnetic valve are each provided with an air inlet, an air outlet, an air exchange opening and three electromagnetic valve connectors. The three electromagnetic valve plug-in connectors are electrically connected with the high-gear electromagnetic valve, the neutral-gear electromagnetic valve and the low-gear electromagnetic valve in a one-to-one correspondence mode. According to the vehicle transfer case gear shifting device, switching and maintaining of the gears of the vehicle transfer case can be directly achieved only through opening and closing control and mutual cooperation of the three electromagnetic valves, and compared with a vehicle transfer case gear shifting device in the prior art, the vehicle transfer case gear shifting device is simpler in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to an electric-controlled pneumatic shifting device for a transfer case, a vehicle transfer case and a vehicle. Background Art

[0002] The automobile transfer case is an assembly component that can realize functions such as high-speed and low-speed gear switching and front and rear axle differential. The transfer case shifting structure can generally be divided into mechanical manual type, electronically controlled hydraulic type, etc.

[0003] However, the mechanical manual transfer case and the electronically controlled hydraulic shift device in the prior art have complex structures. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide a transfer case electronically controlled pneumatic shifting device and a vehicle transfer case vehicle, so as to solve the problem of complex structure of the vehicle transfer case shifting device.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides an electric-controlled pneumatic shifting device, comprising:

[0006] Three shift cylinders, the three shift cylinders respectively corresponding to different gears of the vehicle transfer case;

[0007] A valve body, wherein a high-speed solenoid valve, a neutral-speed solenoid valve and a low-speed solenoid valve are inserted on the valve body, and a main air inlet is provided on the valve body. The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve all have an air inlet, an exhaust port and a ventilation port. The air inlets of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are respectively connected with the main air inlet; three ventilation pipes are respectively provided on the three shift cylinders, and the ventilation ports of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are connected with the three shift cylinders one by one through the three ventilation pipes;

[0008] Three solenoid valve connectors, the three solenoid valve connectors are electrically connected to the high-gear solenoid valve, the neutral-gear solenoid valve 108 and the low-gear solenoid valve in a one-to-one correspondence.

[0009] The embodiment of the utility model further provides a vehicle transfer case, characterized in that the vehicle transfer case comprises the transfer case electronically controlled pneumatic shifting device provided by the embodiment of the utility model.

[0010] An embodiment of the utility model further provides a vehicle, characterized in that the vehicle comprises the vehicle transfer case provided by the embodiment of the utility model.

[0011] One of the above technical solutions has the following advantages or beneficial effects:

[0012] In the embodiment of the utility model, the electric-controlled pneumatic shift device includes:

[0013] Three shift cylinders, the three shift cylinders respectively corresponding to different gears of the vehicle transfer case;

[0014] A valve body, wherein a high-speed solenoid valve, a neutral-speed solenoid valve and a low-speed solenoid valve are inserted on the valve body, and a main air inlet is provided on the valve body. The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve all have an air inlet, an exhaust port and a ventilation port. The air inlets of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are respectively connected with the main air inlet; three ventilation pipes are respectively provided on the three shift cylinders, and the ventilation ports of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are connected with the three shift cylinders one by one through the three ventilation pipes;

[0015] Three solenoid valve connectors are respectively and electrically connected to the high-gear solenoid valve, the neutral-gear solenoid valve and the low-gear solenoid valve in a one-to-one correspondence.

[0016] According to the customer's shifting wishes, the opening and closing of the three solenoid valves can be controlled electrically to cooperate with each other, so that the three shift cylinders can perform corresponding intake or exhaust operations, thereby directly realizing the switching and maintenance of the vehicle transfer case gear. Compared with the shifting device of the vehicle transfer case in the prior art, the actuator of the embodiment of the utility model is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an electric-controlled pneumatic shifting device provided by an embodiment of the utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of an electric-controlled pneumatic shifting device provided by an embodiment of the utility model. Figure 2 ;

[0019] Figure 3 It is a working principle diagram of the electric-controlled pneumatic shifting device provided in the embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1 and Figure 2 As shown, the utility model embodiment provides a schematic structural diagram of an electric-controlled pneumatic shift device for a transfer case, including:

[0022] Three shift cylinders 105, the three shift cylinders 105 respectively corresponding to different gears of the vehicle transfer case;

[0023] A valve body 113, on which a high-speed solenoid valve 107, a neutral-speed solenoid valve 108 and a low-speed solenoid valve 109 are inserted, and a main air inlet 117 is provided on the valve body, and the high-speed solenoid valve 107, the neutral-speed solenoid valve 108 and the low-speed solenoid valve 109 all have an air inlet, an air outlet and a ventilation outlet, and the air inlets of the high-speed solenoid valve 107, the neutral-speed solenoid valve 108 and the low-speed solenoid valve 109 are respectively connected to the main air inlet 117;

[0024] The three shift cylinders 105 are respectively provided with three ventilation pipes, and the ventilation ports of the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are connected to the three shift cylinders 105 in a one-to-one correspondence through the three ventilation pipes;

[0025] Three solenoid valve connectors 104 are electrically connected to the high-gear solenoid valve 107 , the neutral-gear solenoid valve 108 , and the low-gear solenoid valve 109 in a one-to-one correspondence.

[0026] The three shift cylinders 105 correspond to the high gear, low gear and neutral gear of the vehicle transfer case, respectively. When any one of the three shift cylinders 105 is filled with high-pressure gas, the vehicle transfer case can be kept in the corresponding gear. If the user intends to keep the vehicle transfer case in the neutral gear, the neutral gear shift cylinder 105 (2) is filled with high-pressure gas, and the other two shift cylinders are empty or in an exhaust state.

[0027] in, Figure 1 In the example, the main air inlet 117 is arranged on the lower side of the valve body 113. Of course, the main air inlet 117 can also be located on any side of the valve body 113. The utility model does not limit the specific location of the main air inlet 117 on the valve body 113. In addition, in the embodiment of the utility model, the shape of the valve body is not limited.

[0028] The high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are installed on the above-mentioned valve body 113. It can be understood that the air inlets inside the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are connected to the valve body 113, and the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 share a main air inlet 117 through the valve body 113.

[0029] The high-speed solenoid valve 107 , the neutral-speed solenoid valve 108 and the low-speed solenoid valve 109 may be understood as a combined solenoid valve connected in parallel.

[0030] In addition, in the embodiment of the utility model, there is no limitation on the material and pipe shape of the ventilation pipe.

[0031] The high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 may have a first valve position and a second valve position. The high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are in the first valve position when the transfer case needs to be shifted to the corresponding gear, so that the corresponding air inlets of the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are connected to the corresponding ventilation ports; the high-gear solenoid valve, the neutral-gear solenoid valve and the low-gear solenoid valve are in the second valve position when the transfer case does not need to be shifted to the corresponding gear, so that the corresponding ventilation ports of the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are connected to the corresponding exhaust ports, so that the gas in the corresponding shift cylinder is discharged.

[0032] In addition, in the embodiment of the utility model, the three solenoid valve connectors 104 are electrically connected to the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 respectively, and are used to control the power on and off of each solenoid valve respectively. The switching of the first valve position and the second valve position can be achieved by controlling the power on and off according to the user's intention.

[0033] In the embodiment of the utility model, the vehicle transfer case gear position can be directly switched and maintained only through the opening and closing control and mutual cooperation of three solenoid valves, which is simpler in structure than the vehicle transfer case shifting device in the prior art.

[0034] As an optional implementation, the high-speed solenoid valve 107, the neutral-speed solenoid valve 108 and the low-speed solenoid valve 109 are two-position three-way solenoid valves, and the electrical information of the solenoid valves is shown in Table 1.

[0035] Table 1 Solenoid valve electrical information

[0036] Rated voltage DC24 Operating voltage range 18-32V Working current 0.5A Peak current 0.95A Working resistance 48Ω Is there self-protection none Load Type Inductive load Wire type and wire diameter requirements <![CDATA[0.75mm 2 PVC insulated wire]]> Insurance size 5A Power Type Changdian power 12W Connector Model DIN72585-A1-2.1-Sn / K2 Connector IP rating IP67 Working air pressure 0.1-1.1MPa

[0037] In this embodiment, the two-position three-way solenoid valve is more compact than other solenoid valves and can provide the required functions within a limited space, which is conducive to the miniaturization of the entire device.

[0038] In other embodiments, the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 may also be electric two-way valves, Peter-Paul solenoid valves and other solenoid valves, and may also realize the function of the transfer case's electrically controlled pneumatic shifting device.

[0039] As an optional implementation, the neutral position solenoid valve 108 and the low-position solenoid valve 109 are normally closed solenoid valves, and the high-position solenoid valve 107 is a normally open solenoid valve.

[0040] In this embodiment, in the initial state of the vehicle, the high-gear solenoid valve 107 is in the first valve position, and the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 are in the second valve position. This can ensure that when the vehicle is powered on and ventilated for the first time, high-pressure gas will only enter the shift cylinder 105 (1) corresponding to the high gear through the high-gear solenoid valve 107, so that the transfer case is maintained in the high gear by default, ensuring that the transfer case's electronically controlled pneumatic shift device operates normally after being powered on for the first time, making the transfer case's shift logic clearer.

[0041] An example of executing a transfer case shift operation according to a user's intention is as follows:

[0042] When the vehicle is powered on for the first time, the working principle of the combined solenoid valve is as follows: Figure 3 As shown, the high-pressure gas in the air pump enters the valve body 113 through the main air inlet 117. At this time, the three solenoid valves are not energized, and the valve positions of the solenoid valves remain in the original state, that is, the high-speed solenoid valve 107 is in the first valve position, the neutral-speed solenoid valve 108 is in the second valve position, and the low-speed solenoid valve 109 is in the second valve position. Therefore, the high-pressure gas in the air pump will pass through the high-speed solenoid valve 107 and enter the high-speed cylinder 105 (1) of the transfer case from the air outlet of the high-speed solenoid valve through the corresponding air exchange pipe 110, thereby keeping the vehicle transfer case in the high speed.

[0043] When the vehicle transfer case switches from high gear to neutral gear, the high gear solenoid valve connector 104 (3) switches from the power-on mode to the power-off mode, even if the high gear solenoid valve 107 switches from the first valve position to the second valve position; the neutral gear solenoid valve connector 104 (2) switches from the power-off mode to the power-on mode, even if the neutral gear solenoid valve 108 switches from the second valve position to the first valve position; the low gear solenoid valve connector 104 (1) maintains the original power-off state unchanged. Therefore, the high-pressure gas in the air pump will pass through the neutral gear solenoid valve 108 and enter the neutral gear cylinder 105 (2) of the transfer case from the gas outlet of the neutral gear solenoid valve through the corresponding gas exchange pipe 111, and at the same time, the gas in the high gear cylinder 105 (1) of the transfer case will be discharged through the exhaust port 101 of the high gear solenoid valve, thereby realizing the conversion of the vehicle transfer case from high gear to neutral gear and keeping the vehicle transfer case in neutral gear.

[0044] When the vehicle transfer case switches from neutral to low gear, the high gear solenoid valve connector 104 (3) maintains the power-on mode, that is, the high gear solenoid valve 107 is in the second valve position; the neutral gear solenoid valve connector 104 (2) changes from the power-on mode to the power-off mode, even if the neutral gear solenoid valve 108 switches from the first valve position to the second valve position; the low gear solenoid valve connector 104 (1) changes from the power-off mode to the power-on mode, even if the low gear solenoid valve 109 switches from the second valve position to the first valve position. Therefore, the high-pressure gas in the air pump will pass through the low gear solenoid valve 109 and enter the low gear cylinder 105 (3) of the transfer case from the gas outlet of the low gear solenoid valve through the corresponding gas exchange pipe 112, and at the same time, the gas in the neutral gear cylinder 105 (2) will be discharged through the exhaust port 102 of the neutral gear solenoid valve, thereby realizing the conversion of the vehicle transfer case from neutral to low gear and keeping the vehicle transfer case in low gear.

[0045] When the vehicle transfer case switches from low gear to neutral gear, the high gear solenoid valve connector 104 (3) maintains the power-on mode, that is, the high gear solenoid valve 107 is in the second valve position; the neutral gear solenoid valve connector 104 (2) switches from the power-off mode to the power-on mode, even if the neutral gear solenoid valve 108 switches from the second valve position to the first valve position; the low gear solenoid valve connector 104 (1) switches from the power-on mode to the power-off mode, even if the low gear solenoid valve 109 switches from the first valve position to the second valve position. Therefore, the high-pressure gas in the air pump will pass through the neutral gear solenoid valve and enter the neutral gear cylinder 105 (2) of the transfer case from the gas outlet of the neutral gear solenoid valve through the corresponding gas exchange pipe 111, and the gas in the low gear cylinder 105 (3) of the transfer case will be discharged through the exhaust port 103 of the low gear solenoid valve, thereby realizing the conversion of the vehicle transfer case from low gear to neutral gear and keeping the vehicle transfer case in neutral gear.

[0046] When the vehicle transfer case switches from neutral to high gear, the high gear solenoid valve connector 104 (3) switches from the power-off mode to the power-on mode, even if the high gear solenoid valve 109 switches from the second valve position to the first valve position; the neutral gear solenoid valve connector 104 (2) switches from the power-on mode to the power-off mode, even if the high gear solenoid valve 108 switches from the first valve position to the second valve position; the low gear solenoid valve connector 104 (1) maintains the original power-off state unchanged. Therefore, the high-pressure gas in the air pump will pass through the high gear solenoid valve 109 and enter the high gear cylinder 105 (1) of the transfer case from the outlet of the high gear solenoid valve through the corresponding ventilation pipe 112, and at the same time, the gas in the neutral gear cylinder 105 (2) of the transfer case will be discharged through the exhaust port 102 of the neutral gear solenoid valve, thereby realizing the conversion of the vehicle transfer case from high gear to neutral gear and keeping the vehicle transfer case in high gear.

[0047] In addition, in order to conform to the vehicle's shifting logic, in this implementation, the transfer case cannot be directly switched from high gear to low gear, nor can it be directly switched from low gear to high gear. When switching between high gear and low gear, it must first be switched to neutral gear before proceeding, that is, the shifting must be performed from high gear to neutral gear to low gear, or from low gear to neutral gear to high gear. When the vehicle is turned off and powered off in a certain gear of the transfer case and then powered on again, the transfer case gear should maintain the original gear.

[0048] In this embodiment, by using normally open and normally closed solenoid valves separately, the default gear is maintained directly when the power is first turned on, avoiding the complicated process of secondary switching after power is turned on, making the subsequent gear shifting operation logic clearer and the switching between gears smoother.

[0049] In other embodiments, other combination modes of normally-open solenoid valves and normally-closed solenoid valves may also be included, for example: the above-mentioned neutral gear solenoid valve 108 and the above-mentioned high gear solenoid valve 107 are normally closed solenoid valves, and the above-mentioned low gear solenoid valve 109 is a normally-open solenoid valve; or the above-mentioned low gear solenoid valve 109 and the above-mentioned high gear solenoid valve 107 are normally closed solenoid valves, and the above-mentioned neutral gear solenoid valve 108 is a normally-open solenoid valve, etc. Any other arbitrary combination modes will not affect the realization of the basic functions of the transfer case's electronically controlled pneumatic shifting device.

[0050] As an optional implementation, the high-speed solenoid valve 107, the neutral-speed solenoid valve 108 and the low-speed solenoid valve 109 are arranged side by side along the length direction of the valve body. Figure 1 The present embodiment does not limit the order of the high-speed solenoid valve 107 , the neutral-speed solenoid valve 108 , and the low-speed solenoid valve 109 .

[0051] In this embodiment, the side-by-side arrangement enables the three solenoid valves to be placed more compactly, thereby maximizing space utilization, facilitating the miniaturization of the transfer case's electric-controlled pneumatic shift device, and enhancing the overall aesthetics and coordination of the device.

[0052] Of course, in other embodiments, the three solenoid valves are arranged in a triangle on the valve body, or are arranged on both sides, etc., which does not affect the realization of the basic functions of the device.

[0053] As an optional implementation, for example: Figure 1 As shown, the valve body 113 is provided with three through holes for the three ventilation pipes to pass through, and the three ventilation pipes are connected to the ventilation ports of the high-gear solenoid valve 107, the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 through the through holes.

[0054] In this embodiment, the connection between the three ventilation pipes and the high-gear solenoid valve 107 , the neutral-gear solenoid valve 108 and the low-gear solenoid valve 109 can be made more stable, while saving space in the overall structure.

[0055] In other embodiments of the utility model, the three ventilation pipes may not be connected to the solenoid valve through the valve body, and may be located above the solenoid valve or at other locations, as long as they are connected to the internal gas of the ventilation port of the solenoid valve.

[0056] As an optional embodiment, mounting brackets are fixedly arranged at both ends of the valve body 113, and the mounting brackets include a first mounting bracket 114 and a second mounting bracket 115. The valve body 113 is located between the first mounting bracket 114 and the second mounting bracket 115. At least one fastener 116 is arranged on the valve body 113, and the first mounting bracket 114 and the second mounting bracket 115 are connected to the valve body 113 through the at least one fastener 116. This facilitates the installation and placement of the transfer case electric-controlled pneumatic shift device.

[0057] in, Figure 1 For example, at least one fastener 116 is a group of long bolts and nuts that cross the valve body 113 and the mounting bracket located on both sides of the valve body 113, but the at least one fastener 116 can also be a stud, a screw, a pin, etc., as long as the mounting bracket can be fixed to both sides of the valve body 113, the embodiment of the utility model is not limited to this.

[0058] In this embodiment, by providing the mounting bracket, the shift device can be flexibly installed and placed, stably connected to the vehicle transfer case, and provide support and protection for the device.

[0059] Of course, other embodiments of the present invention also include other components for fixing or placing, such as an integrated support frame or an additional fixed base.

[0060] As an optional implementation, for example: Figure 1 As shown, the central axis of the three ventilation pipes and the central axis of the valve body form an angle of 20 to 30 degrees in the length direction of the valve body 113. This makes the pipeline routing of the three ventilation pipes occupy a smaller space, saving space in the overall structure.

[0061] Of course, in other embodiments of the present invention, the pipe direction of the ventilation pipe can also be other angles, and the layout and specific shape of the ventilation pipe are not specifically limited in the embodiments of the present invention.

[0062] As an optional implementation, for example: Figure 3As shown, a bidirectional transient diode 118 is connected between the positive electrode and the negative electrode of each of the three solenoid valve connectors 104 .

[0063] In this implementation, the bidirectional transient diode 118 may be of type P6KE43CA. Of course, other types of bidirectional transient diodes may also be used.

[0064] In this embodiment, the bidirectional transient diode protects the circuit from damage caused by instantaneous overvoltage or overcurrent, thereby ensuring safety and stability when switching gears.

[0065] Of course, in other embodiments of the present invention, other components that play a protective role in the circuit, such as transient voltage suppressors and metal oxide varistors, are also included. Of course, in this embodiment, the device can also be implemented without the above auxiliary parts.

[0066] In the embodiment of the utility model, the electric-controlled pneumatic shift device includes:

[0067] Three shift cylinders, the three shift cylinders respectively corresponding to different gears of the vehicle transfer case;

[0068] A valve body, wherein a high-speed solenoid valve, a neutral-speed solenoid valve and a low-speed solenoid valve are inserted on the valve body, and a main air inlet is provided on the valve body. The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve all have an air inlet, an exhaust port and a ventilation port. The air inlets of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are respectively connected to the main air inlet;

[0069] The three shift cylinders are respectively provided with three ventilation pipes, and the ventilation ports of the high-gear solenoid valve, the neutral-gear solenoid valve and the low-gear solenoid valve are connected to the three shift cylinders one by one through the three ventilation pipes;

[0070] Three solenoid valve connectors are respectively and electrically connected to the high-gear solenoid valve, the neutral-gear solenoid valve and the low-gear solenoid valve in a one-to-one correspondence.

[0071] According to the customer's shifting wishes, the opening and closing of the three solenoid valves can be controlled electrically to cooperate with each other, so that the three shift cylinders can perform corresponding intake or exhaust operations, thereby directly realizing the switching and maintenance of the vehicle transfer case gear. Compared with the shifting device of the vehicle transfer case in the prior art, the actuator of the embodiment of the utility model is simple.

[0072] In addition, in the embodiment of the utility model, a vehicle transfer case is also provided, including a transfer case electronically controlled pneumatic shift device of any implementation manner provided in the embodiment of the utility model.

[0073] In addition, in an embodiment of the present invention, a vehicle is also provided, including a vehicle transfer case of any embodiment provided in the embodiment of the present invention.

[0074] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electronically controlled pneumatic shifting device for a transfer case, characterized in that: include: Three shift cylinders, the three shift cylinders corresponding to three different gears of the vehicle transfer case respectively; A valve body, wherein a high-speed solenoid valve, a neutral-speed solenoid valve and a low-speed solenoid valve are inserted on the valve body, and a main air inlet is provided on the valve body. The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve all have an air inlet, an exhaust port and a ventilation port. The air inlets of the high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are respectively connected to the main air inlet; The three shift cylinders are respectively provided with three ventilation pipes, and the ventilation ports of the high-gear solenoid valve, the neutral-gear solenoid valve and the low-gear solenoid valve are connected to the three shift cylinders one by one through the three ventilation pipes; Three solenoid valve connectors are respectively and electrically connected to the high-gear solenoid valve, the neutral-gear solenoid valve, and the low-gear solenoid valve.

2. The transfer case electronically controlled pneumatic shift device according to claim 1, characterized in that: The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are two-position three-way solenoid valves.

3. The transfer case electronically controlled pneumatic shift device according to claim 2, characterized in that: The neutral position solenoid valve and the low position solenoid valve are normally closed solenoid valves, and the high position solenoid valve is a normally open solenoid valve.

4. The transfer case electronically controlled pneumatic shift device according to claim 3, characterized in that: The high-speed solenoid valve, the neutral-speed solenoid valve and the low-speed solenoid valve are arranged side by side along the length direction of the valve body.

5. The transfer case electronically controlled pneumatic shift device according to claim 4, characterized in that: The valve body is provided with three through holes for the three ventilation pipes to pass through, and the three ventilation pipes are respectively connected with the ventilation ports of the high-gear solenoid valve, the neutral-gear solenoid valve, and the low-gear solenoid valve through the through holes.

6. The transfer case electronically controlled pneumatic shift device according to claim 5, characterized in that: Mounting brackets are fixedly arranged at both ends of the valve body, and the mounting brackets include a first mounting bracket and a second mounting bracket. The valve body is located between the first mounting bracket and the second mounting bracket. At least one fastener is arranged on the valve body, and the first mounting bracket and the second mounting bracket are connected to the valve body through the at least one fastener.

7. The transfer case electronically controlled pneumatic shift device according to claim 5, characterized in that: There is an angle of 20 to 30 degrees between the central axis of the three ventilation pipes and the central axis of the valve body in the length direction of the valve body.

8. The transfer case electronically controlled pneumatic shift device according to claim 3, characterized in that: A bidirectional transient diode is connected between the positive pole and the negative pole of each of the three solenoid valve connectors.

9. A vehicle transfer case, characterized in that: The vehicle transfer case has a transfer case electro-pneumatic shifting device as claimed in any one of claims 1 to 7.

10. A vehicle, characterized in that: The vehicle has a vehicle transfer case as claimed in claim 8.

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