Electric hydraulic lifting control system for spare wheel carrier

Abstract

The invention discloses an electric hydraulic lifting control system for a spare wheel carrier. The electric hydraulic lifting control system comprises a hydraulic lifting module and a control circuit module, the hydraulic lifting module comprises an oil tank, a motor, an oil pump, an electromagnetic valve and a hydraulic oil cylinder. The hydraulic lifting module comprises an oil pumping low-pressure oil way, an oil pumping high-pressure oil way, an oil return oil way and a working oil way. The motor is in transmission connection with the oil pump and used for controlling the oil pump to operate, and the oil pump is provided with an oil inlet and an oil outlet; the electromagnetic valve is provided with an oil inlet P, an oil return port T and a working port; the oil pumping low-pressure oil way is communicated with the oil tank and the oil inlet, the oil pumping high-pressure oil way is communicated with the oil outlet and the oil inlet P, the oil return oil way is communicated with the oil tank and the oil return T port, and the working oil way is communicated with the working port and the hydraulic oil cylinder. The electromagnetic valve and the motor are both connected with a whole vehicle power source through the control circuit module, the control circuit module is used for controlling power-on and power-off of the motor and the electromagnetic valve, and lifting of the spare wheel carrier can be achieved only by connecting the whole vehicle power source without depending on a power mechanism on the whole vehicle.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control system technology, and in particular to an electric hydraulic lifting control system for a spare tire carrier. Background Technology

[0002] With the increasing prevalence of heavy-duty vehicles such as commercial vehicles and engineering vehicles, the weight of spare tires has increased from tens of kilograms in traditional passenger cars to over a hundred kilograms. This change has significantly increased the difficulty of storing and retrieving spare tires. As the core device for storing spare tires in heavy-duty vehicles, the ease of raising and lowering the spare tire rack directly affects the efficiency of emergency handling of vehicle malfunctions. Existing electric hydraulic raising and lowering control systems for automotive spare tire racks include an oil pump, a hydraulic cylinder, a solenoid valve, an oil tank, and a control circuit. The oil pump, hydraulic cylinder, and oil tank are respectively connected to the corresponding oil ports of the solenoid valve. The control circuit is connected to the solenoid valve, and the hydraulic cylinder is connected to the vehicle's spare tire rack. The control circuit controls the operation of the solenoid valve, allowing the hydraulic cylinder to selectively connect to either the oil pump or the oil tank, thereby controlling the raising or lowering of the spare tire rack.

[0003] However, the existing electric hydraulic lifting control system for car spare tire racks usually uses the vehicle steering pump as the power source, which means that the lifting operation must be performed while the engine or electric motor is running. This makes it unusable in special scenarios such as vehicle malfunction and engine shutdown, thus limiting emergency support capabilities. Therefore, it is necessary to improve it. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing an electric hydraulic lifting control system for a spare tire carrier. This system has a simple and reasonable structure, is easy to operate, and does not rely on the power mechanism of the vehicle. It only needs to be connected to the vehicle's power supply to realize the lifting and lowering of the spare tire carrier.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention discloses an electric hydraulic lifting control system for a spare tire rack. Includes a hydraulic lifting module and a control circuit module; The hydraulic lifting module includes an oil tank, a motor, an oil pump, a solenoid valve, and a hydraulic cylinder. The hydraulic lifting module includes a low-pressure oil circuit for pumping oil, a high-pressure oil circuit for pumping oil, a return oil circuit, and a working oil circuit. The motor is connected to the oil pump for transmission, and the motor is used to control the operation of the oil pump. The oil pump has an oil inlet and an oil outlet. The solenoid valve has an oil inlet P port, an oil return T port, and a working port; The low-pressure oil circuit of the pump connects to the oil tank and the oil inlet; the high-pressure oil circuit of the pump connects to the oil outlet and the oil inlet P; the return oil circuit connects to the oil tank and the return oil T; and the working oil circuit connects to the working port and the hydraulic cylinder. Both the solenoid valve and the motor are connected to the vehicle power supply through the control circuit module, which is used to control the power supply to and from the motor and the solenoid valve.

[0006] Furthermore, the control circuit module includes a first switch, a second switch, an electromagnetic relay, and a diode, wherein the first switch and the second switch are both normally open switches; The electromagnetic relay includes a relay coil and a contact switch that cooperates with the relay coil. When the relay coil is energized, the contact switch is closed, and when the relay coil is de-energized, the contact switch is open. The first terminal of the first switch, the first terminal of the second switch, and the first terminal of the contact switch are connected in parallel to the positive terminal of the vehicle power supply. The second terminal of the first switch, the electrical output terminal of the diode, and the electrical input terminal of the relay coil are connected in parallel. The electrical input terminal of the diode and the electrical input terminal of the solenoid valve are connected in parallel to the second terminal of the second switch. The second terminal of the contact switch is connected in series with the electrical input terminal of the motor; The electrical output terminals of the solenoid valve, the motor, and the relay coil are connected in parallel to the negative terminal of the vehicle power supply.

[0007] Furthermore, the control circuit module includes a third switch, which is a normally open switch. The first end of the first switch, the first end of the second switch, and the first end of the contact switch are connected in parallel to the positive terminal of the vehicle power supply through the third switch.

[0008] Furthermore, the working port includes a working port A and a working port B, the working oil circuit includes a first working oil circuit and a second working oil circuit, the hydraulic cylinder has a rod chamber and a rodless chamber, the first working oil circuit connects the working port A and the rodless chamber, and the second working oil circuit connects the working port B and the rod chamber.

[0009] Furthermore, the solenoid valve is a two-position four-way solenoid directional valve. The solenoid valve includes a valve chamber and a solenoid valve core. The solenoid valve core is slidably disposed in the valve chamber. The valve chamber has a first position and a second position in which the solenoid valve core can be located. The solenoid valve core can slide between the first position and the second position. When the solenoid valve core is in the first position, the oil inlet P port is connected to the working A port, and the oil return T port is connected to the working B port; when the solenoid valve core is in the second position, the oil inlet P port is connected to the working B port, and the oil return T port is connected to the working A port.

[0010] Furthermore, the hydraulic lifting module also includes a two-way hydraulic lock, which is connected in conjunction with the first working oil circuit and the second working oil circuit. The two-way hydraulic lock is used to control the on / off state of the first working oil circuit and the second working oil circuit and to maintain the oil pressure.

[0011] Furthermore, the bidirectional hydraulic lock includes a first check valve and a second check valve. The first check valve is connected in series to the first working oil circuit. The first check valve has a first input port, a first output port, and a first control port. The first input port is connected to the working port A, and the first output port is connected to the rodless chamber. The second check valve has a second input port, a second output port, and a second control port. The second input port is connected to the working port B, and the second output port is connected to the rod chamber. The bidirectional hydraulic lock further includes a first control oil circuit and a second control oil circuit. The first control oil circuit connects the first control port and the working port B, and is used to control the first input port and the first output port to be connected. The second control oil circuit connects the second control port and the working port A, and is used to control the second input port and the second output port to be connected.

[0012] Furthermore, the hydraulic lifting module also includes an overflow oil circuit, one end of which is connected to the oil outlet, and the other end of which is connected to the oil tank. An overflow valve is provided in the overflow oil circuit.

[0013] Furthermore, a filter screen is installed in the low-pressure oil circuit of the pump.

[0014] Furthermore, the hydraulic lifting module also includes a base, and the motor, oil pump, oil tank, and solenoid valve are all integrated into the base.

[0015] The beneficial effects of the present invention are as follows: The electric hydraulic lifting control system for spare tire rack described in the present invention does not rely on the power mechanism (engine or generator) of the vehicle. It only needs to be connected to the vehicle's power supply to realize the lifting of the spare tire rack. The solenoid valve is controlled by the first switch and the second switch to switch the direction, replacing the traditional mechanical handle, which makes the operation convenient.

[0016] Both the solenoid valve and the motor are connected to the vehicle power supply through the control circuit module. The control circuit module is used to control the on and off of the motor and the solenoid valve. When the motor is powered on, the motor drives the oil pump to run. The oil pump draws low-pressure oil filtered by the filter screen from the oil tank through the low-pressure oil pumping circuit. After being pressurized, it forms high-pressure oil, which is then delivered to the solenoid valve through the high-pressure oil pumping circuit.

[0017] When the solenoid valve is de-energized, high-pressure oil enters the rod chamber of the hydraulic cylinder, pushing the piston of the hydraulic cylinder to retract the piston rod, causing the spare tire carrier to rise; simultaneously, the oil in the rodless chamber of the hydraulic cylinder can flow back into the oil tank.

[0018] When the solenoid valve is energized, high-pressure oil enters the rodless chamber of the hydraulic cylinder, pushing the piston of the hydraulic cylinder to extend the piston rod and lower the spare tire carrier; simultaneously, the oil in the rod chamber of the hydraulic cylinder can flow back into the oil tank. Attached Figure Description

[0019] Figure 1 It is a structural diagram of the motor, oil tank, solenoid valve and base; Figure 2 It is a structural diagram of the motor, oil pump, solenoid valve and base; Figure 3 This is a structural schematic diagram of a two-way hydraulic lock and a hydraulic cylinder from a first-view perspective. Figure 4 This is a structural schematic diagram of a two-way hydraulic lock and a hydraulic cylinder from a second-view perspective. Figure 5 This is the hydraulic schematic diagram and circuit control diagram of the present invention; Figure 6 This is the circuit control diagram of the present invention; Figure 7 This is a hydraulic schematic diagram of the present invention; Figure 8 This is a cross-sectional structural diagram of the base; Figure 9 This is a cross-sectional structural diagram of the relief valve.

[0020] Figures 1-9 In the middle: 1. Motor; 2. Oil pump; 3. Oil tank; 4. Solenoid valve; 41. Working port A; 42. Working port B; 43. Oil inlet port P; 44. Oil return port T; 5. Base; 6. Two-way hydraulic lock; 61. First check valve; 62. Second check valve; 63. First control oil circuit; 64. Second control oil circuit; 7. Hydraulic cylinder; 71. Rodless chamber; 72. Rod chamber; 8. Spare tire holder; 9. Relief valve; 91. Steel ball; 92. Third spring ; 93. Stepped hole; 10. Filter screen; 101. Low-pressure oil circuit for pumping oil; 102. High-pressure oil circuit for pumping oil; 103. Return oil circuit; 104. First working oil circuit; 105. Second working oil circuit; 106. Overflow oil circuit; 201. First switch; 202. Second switch; 203. Electromagnetic relay; 2031. Relay coil; 2032. Contact switch; 204. Diode; 205. Vehicle power supply; 206. Third switch. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] like Figures 1-9 The diagram shows an electric hydraulic lifting control system for a spare tire rack. Includes a hydraulic lifting module and a control circuit module; The hydraulic lifting module includes an oil tank 3, a motor 1, an oil pump 2, a solenoid valve 4, and a hydraulic cylinder 7. The hydraulic lifting module includes a low-pressure oil circuit 101, a high-pressure oil circuit 102, a return oil circuit 103, and a working oil circuit. The motor 1 is connected to the oil pump 2 in a transmission manner. The motor 1 is used to control the operation of the oil pump 2. The oil pump 2 has an oil inlet and an oil outlet. The motor 1 is equipped with several motor terminals. When the motor 1 is a DC motor 1, it has two motor terminals; when the motor 1 is a single-phase AC motor 1, it has three or four motor terminals. The number of motor terminals matches the type of motor 1 selected. This invention is illustrated using a DC motor 1 as an example.

[0023] The solenoid valve 4 has an oil inlet P port 43, an oil return T port 44, and a working port; The low-pressure oil circuit 101 of the pump connects to the oil tank 3 and the oil inlet, the high-pressure oil circuit 102 of the pump connects to the oil outlet and the oil inlet P port 43, the return oil circuit 103 connects to the oil tank 3 and the return oil T port 44, and the working oil circuit connects to the working port and the hydraulic cylinder 7. The hydraulic cylinder 7 has an inner cavity, in which a piston and a piston rod are movably disposed. The piston and piston rod are fixedly connected. The piston divides the inner cavity of the cylinder into a rod chamber 72 and a rodless chamber 71. The piston rod is connected to the spare tire carrier 8. The extension and retraction of the piston rod drives the spare tire carrier 8 to achieve lifting and lowering movements. In this embodiment, the extension of the piston rod controls the lowering of the spare tire carrier 8, and the retraction of the piston rod controls the lifting of the spare tire carrier 8.

[0024] Both the solenoid valve 4 and the motor 1 are connected to the vehicle power supply 205 through the control circuit module, which is used to control the power supply to and from the motor 1 and the solenoid valve 4.

[0025] See Figure 5 The electric hydraulic lifting control system for a spare tire rack described in this invention does not rely on the power mechanism (engine or generator) on the vehicle. It can achieve the lifting and lowering of the spare tire rack simply by connecting to the vehicle's power supply 205.

[0026] See Figure 6 Preferably, in this embodiment, the control circuit module includes a first switch 201, a second switch 202, an electromagnetic relay 203, and a diode 204, wherein the first switch 201 and the second switch 202 are both normally open switches; The electromagnetic relay 203 includes a relay coil 2031 and a contact switch 2032 that cooperates with the relay coil 2031. When the relay coil 2031 is energized, the contact switch 2032 is closed, and when the relay coil 2031 is de-energized, the contact switch 2032 is open. The first terminal of the first switch 201, the first terminal of the second switch 202, and the first terminal of the contact switch 2032 are connected in parallel to the positive terminal of the vehicle power supply 205; The second terminal of the first switch 201, the electrical output terminal of the diode 204, and the electrical input terminal of the relay coil 2031 are connected in parallel. The electrical input terminal of the diode 204 and the electrical input terminal of the solenoid valve 4 are connected in parallel to the second terminal of the second switch 202. The second terminal of the contact switch 2032 is connected in series with the electrical input terminal of the motor 1; The electrical output terminals of the solenoid valve 4, the motor 1, and the relay coil 2031 are connected in parallel to the negative terminal of the vehicle power supply 205.

[0027] When the first switch 201 is closed, the relay coil 2031 of the electromagnetic relay 203 is energized, the contact switch 2032 closes to start the motor 1, and at the same time, the solenoid valve 4 is not energized and remains in its current state. When the second switch 202 is closed, the current splits into two paths: one path powers the relay coil 2031 through the diode 204, and the contact switch 2032 closes to start the motor 1; at the same time, the other path powers the solenoid valve 4, controlling the solenoid valve 4 to switch direction, so as to realize the coordinated action of the motor 1 and the solenoid valve 4.

[0028] Diode 204 can prevent current from flowing into solenoid valve 4 when the first switch 201 is closed, thus avoiding malfunction of solenoid valve 4.

[0029] Specifically, when the first switch 201 is closed, the current flows out from the second end of the first switch 201 and will preferentially pass through the relay coil 2031 to form a circuit. At this time, the diode 204 is in the reverse cut-off state, preventing the current from flowing to the solenoid valve 4, ensuring that the solenoid valve 4 will only be energized and reversed when the second switch 202 is closed.

[0030] The solenoid valve 4 is switched by the first switch 201 and the second switch 202, which replaces the traditional mechanical handle for switching, making it easy to operate.

[0031] See Figure 6 To improve the safety of system operation, preferably, in this embodiment, the control circuit module further includes a third switch 206, which is a normally open switch. The first end of the first switch 201, the first end of the second switch 202, and the first end of the contact switch 2032 are connected in parallel to the positive terminal of the vehicle power supply 205 through the third switch 206.

[0032] Specifically, the positive terminal of the vehicle power supply 205 is connected in series with the first terminal of the third switch 206, and the first terminal of the first switch 201, the first terminal of the second switch 202, and the first terminal of the contact switch 2032 are connected in parallel with the second terminal of the third switch 206.

[0033] The third switch 206 is designed so that the operator must close the third switch 206 before performing the spare tire raising and lowering operation to prevent accidental operation caused by accidentally touching the first switch 201 or the second switch 202. At the same time, after the operation is completed, the third switch 206 is turned off to disconnect the entire control circuit module from the vehicle power supply 205.

[0034] See Figure 5 Preferably, in this embodiment, the working port includes a working port A 41 and a working port B 42, the working oil circuit includes a first working oil circuit 104 and a second working oil circuit 105, the hydraulic cylinder 7 has a rod chamber 72 and a rodless chamber 71, the first working oil circuit 104 connects the working port A 41 and the rodless chamber 71, and the second working oil circuit 105 connects the working port B 42 and the rod chamber 72.

[0035] The solenoid valve 4 has an electromagnetic coil, which is connected in series with the output terminal of the second switch 202. When the electromagnetic coil is energized, it controls the solenoid valve 4 to switch. Preferably, in this embodiment, the solenoid valve 4 is a two-position four-way solenoid valve. The solenoid valve 4 includes a valve cavity and a solenoid valve core. The solenoid valve core is slidably disposed in the valve cavity. The valve cavity has a first position and a second position in which the solenoid valve core can be located. The solenoid valve core can slide between the first position and the second position. When the solenoid valve core is in the first position, the oil inlet P port 43 is connected to the working A port 41, and the oil return T port 44 is connected to the working B port 42; when the solenoid valve core is in the second position, the oil inlet P port 43 is connected to the working B port 42, and the oil return T port 44 is connected to the working A port 41.

[0036] In this embodiment, when the electromagnetic coil is not energized, the electromagnetic valve core is in the second position; when the electromagnetic coil is energized, the electromagnetic valve core is in the first position, and the oil circuit switching is achieved by the sliding of the electromagnetic valve core in the valve cavity.

[0037] To ensure that the hydraulic cylinder 7 can stably hold the spare tire carrier in its current position and prevent accidental descent due to oil circuit leaks, preferably, in this embodiment, the hydraulic lifting module further includes a two-way hydraulic lock 6. The two-way hydraulic lock 6 is connected in cooperation with the first working oil circuit 104 and the second working oil circuit 105. The two-way hydraulic lock 6 is used to control the opening and closing of the first working oil circuit 104 and the second working oil circuit 105 and to maintain oil pressure. As a safety protection device, the two-way hydraulic lock 6 can prevent the spare tire carrier 8 from sliding down unintentionally. For example, during vehicle operation, due to road bumps, the piston rod may accidentally slide. In this embodiment, the two-way hydraulic lock 6 can block the backflow of oil in the rodless chamber 71 and the rod chamber 72, keeping the spare tire carrier 8 in its current position. Similarly, if internal leakage occurs inside the hydraulic cylinder 7, or if there is leakage in the oil pipe, the piston rod may accidentally slide. In this embodiment, the two-way hydraulic lock 6 can block the backflow of oil in the rodless chamber 71 and the rod chamber 72, keeping the spare tire carrier 8 in its current position.

[0038] See 3 and Figure 4 Preferably, the bidirectional hydraulic lock 6 and the hydraulic cylinder 7 are integrated into one unit, resulting in a compact structure and saving installation space. The bidirectional hydraulic lock 6 integrates two pipe fittings for connecting oil pipes. By integrating the pipe fittings onto the bidirectional hydraulic lock 6, additional connecting components are reduced, making the entire hydraulic system layout more compact and also reducing potential leakage points.

[0039] Preferably, in this embodiment, the bidirectional hydraulic lock 6 includes a first check valve 61 and a second check valve 62. The first check valve 61 is connected in series to the first working oil circuit 104. The first check valve 61 has a first input port, a first output port and a first control port. The first input port is connected to the working A port 41 and the first output port is connected to the rodless chamber 71. The second check valve 62 has a second input port, a second output port and a second control port. The second input port is connected to the working B port 42 and the second output port is connected to the rod chamber 72. See Figure 7 The bidirectional hydraulic lock 6 further includes a first control oil circuit 63 and a second control oil circuit 64. The first control oil circuit 63 connects the first control port and the working B port 42. The first control oil circuit 63 is used to control the first input port and the first output port to be connected. The second control oil circuit 64 connects the second control port and the working A port 41. The second control oil circuit 64 is used to control the second input port and the second output port to be connected.

[0040] Preferably, in this embodiment, the first one-way valve 61 includes a first valve core and a first spring, the first spring always having a tendency to cause the first valve core to seal the first input port, and the second one-way valve 62 includes a second valve core and a second spring, the second spring always having a tendency to cause the second valve core to seal the second input port.

[0041] When high-pressure oil is input to working port B 42, the high-pressure oil acts on the first control port of the first check valve 61 through the first control oil circuit 63, overcoming the spring force in the first check valve 61, making the first input port and the first output port connected, allowing the oil in the rodless chamber 71 to flow back.

[0042] When high-pressure oil is input into working port A 41, the high-pressure oil acts on the second control port of the second check valve 62 through the second control oil circuit 64, overcoming the spring force in the second check valve 62, so that the second input port and the second output port are connected, allowing the oil in the rod chamber 72 to flow back.

[0043] When motor 1 stops working and there is no high-pressure oil in either working port A 41 or working port B 42, the first valve core automatically seals the first input port under the action of the first spring, and the second valve core automatically seals the second input port under the action of the second spring, blocking the backflow of oil in the rodless chamber 71 and the rod chamber 72. This achieves the bidirectional locking and pressure-holding function of the hydraulic cylinder 7, keeping the spare tire carrier 8 in its current position. This prevents the spare tire carrier 8 from sliding down due to vehicle bumps, internal leakage in the cylinder, or oil pipe leakage, protecting the safety of surrounding personnel and equipment.

[0044] See Figure 7 Preferably, in this embodiment, the hydraulic lifting module further includes an overflow oil passage 106, one end of which is connected to the oil outlet, and the other end of which is connected to the oil tank 3. An overflow valve 9 is provided in the overflow oil passage 106.

[0045] See Figure 9 In this embodiment, the overflow valve 9 includes a steel ball 91 and a third spring 92; the overflow valve 9 has a stepped hole 93 that seals with the steel ball 91, and the third spring 92 always has a tendency to make the steel ball 91 seal the stepped hole 93. The overflow valve 9 is prior art, so it will not be described in detail here.

[0046] When the system pressure exceeds the set value, the high-pressure oil overcomes the elastic force of the third spring 92, pushes open the steel ball 91, and the overflow valve 9 opens. The high-pressure oil flows back to the oil tank 3 through the overflow oil passage 106 to prevent the system from overloading.

[0047] Preferably, in this embodiment, a filter screen 10 is provided in the low-pressure oil circuit 101 of the pump oil to filter oil impurities and protect the oil pump 2 and hydraulic components.

[0048] See Figure 8 Preferably, in this embodiment, the hydraulic lifting module further includes a base 5, and the motor 1, oil pump 2, oil tank 3, and solenoid valve 4 are all integrated into the base 5. Preferably, in this embodiment, the overflow valve 9 and filter screen 10 are integrated inside the base 5, resulting in a compact structure and saving installation space.

[0049] See Figure 1 and Figure 2 , Figure 2 The oil tank 3 is concealed. Preferably, in this embodiment, the oil pump 2 is located inside the oil tank 3. The oil pump 2 can only be seen by disassembling the oil tank 3, which saves space and avoids exposing the oil pump 2 to the outside, reducing the interference of the external environment on the oil pump 2.

[0050] The working principle of this invention is as follows: When the third switch 206 and the first switch 201 are closed, the relay coil 2031 of the electromagnetic relay 203 is energized, the contact switch 2032 is closed, the motor 1 starts, the motor 1 drives the oil pump 2 to run, the oil pump 2 draws low-pressure oil filtered by the filter screen 10 from the oil tank 3 through the low-pressure oil circuit 101, and after being pressurized, it forms high-pressure oil, which is delivered to the oil inlet P port 43 of the solenoid valve 4 through the high-pressure oil circuit 102; at the same time, the solenoid valve 4 is not energized (in the second position), the oil inlet P port 43 is connected to the working B port 42, and the oil return T port 44 is connected to the working A port 41.

[0051] High-pressure oil enters the rod chamber 72 of the hydraulic cylinder 7 through the working port B 42 and the second working oil circuit 105, opening the second check valve 62. This pushes the piston, causing the piston rod to retract and raising the spare tire carrier. Simultaneously, some high-pressure oil flows out from the working port B 42 and flows through the first control oil circuit 63, opening the first check valve 61. This allows the oil in the rodless chamber 71 to flow back to the oil tank 3 through the first working oil circuit 104, the working port A 41, the return oil port T 44, and the return oil circuit 103.

[0052] When the third switch 206 and the second switch 202 are closed, the relay coil 2031 of the electromagnetic relay 203 is energized through the diode 204, the contact switch 2032 is closed, the motor 1 starts, the motor 1 drives the oil pump 2 to run, the oil pump 2 draws low-pressure oil filtered by the filter screen 10 from the oil tank 3 through the low-pressure oil circuit 101, and after being pressurized, it forms high-pressure oil, which is delivered to the oil inlet P port 43 of the solenoid valve 4 through the high-pressure oil circuit 102; at the same time, the solenoid valve 4 is energized (in the first position), the oil inlet P port 43 is connected to the working A port 41, and the oil return T port 44 is connected to the working B port 42.

[0053] After the high-pressure oil flows out from the working port A 41, it flows through the first working oil circuit 104. The high-pressure oil opens the first check valve 61 and enters the rodless chamber 71 of the hydraulic cylinder 7, pushing the piston and causing the piston rod to extend, thus lowering the spare tire carrier. Simultaneously, some high-pressure oil flows out from the working port A 41 and flows through the second control oil circuit 64, opening the second check valve 62, so that the oil in the rod chamber 72 can flow back to the oil tank 3 through the second working oil circuit 105, the working port B 42, the return oil port T 44, and the return oil circuit 103.

[0054] By setting a two-way hydraulic lock 6, when the motor 1 stops working and there is no high-pressure oil in both working port A 41 and working port B 42, the first check valve 61 and the second check valve 62 close under the action of their respective spring forces, sealing the oil in the rodless chamber 71 and the rod chamber 72, thereby realizing the two-way locking and pressure holding functions of the hydraulic cylinder 7.

[0055] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A spare tire rack electric hydraulic lifting control system, characterized in that: Includes a hydraulic lifting module and a control circuit module; The hydraulic lifting module includes an oil tank (3), a motor (1), an oil pump (2), a solenoid valve (4), and a hydraulic cylinder (7). The hydraulic lifting module includes a low-pressure oil circuit (101), a high-pressure oil circuit (102), a return oil circuit (103), and a working oil circuit; The motor (1) is connected to the oil pump (2) for transmission. The motor (1) is used to control the operation of the oil pump (2). The oil pump (2) has an oil inlet and an oil outlet. The solenoid valve (4) has an oil inlet P port (43), an oil return T port (44), and a working port; The low-pressure oil circuit (101) of the pump connects the oil tank (3) and the oil inlet, the high-pressure oil circuit (102) of the pump connects the oil outlet and the oil inlet P port (43), the return oil circuit (103) connects the oil tank (3) and the return oil T port (44), and the working oil circuit connects the working port and the hydraulic cylinder (7). The solenoid valve (4) and the motor (1) are both connected to the vehicle power supply (205) through the control circuit module. The control circuit module is used to control the power supply of the motor (1) and the solenoid valve (4).

2. The electric hydraulic lifting control system for a spare tire rack according to claim 1, characterized in that: The control circuit module includes a first switch (201), a second switch (202), an electromagnetic relay (203), and a diode (204). The first switch (201) and the second switch (202) are both normally open switches. The electromagnetic relay (203) includes a relay coil (2031) and a contact switch (2032) that cooperates with the relay coil (2031). When the relay coil (2031) is energized, the contact switch (2032) is closed, and when the relay coil (2031) is de-energized, the contact switch (2032) is open. The first end of the first switch (201), the first end of the second switch (202), and the first end of the contact switch (2032) are connected in parallel to the positive terminal of the vehicle power supply (205); The second end of the first switch (201), the electrical output end of the diode (204) and the electrical input end of the relay coil (2031) are connected in parallel, and the electrical input end of the diode (204) and the electrical input end of the solenoid valve (4) are connected in parallel to the second end of the second switch (202); The second terminal of the contact switch (2032) is connected in series with the electrical input terminal of the motor (1); The electrical output terminals of the solenoid valve (4), the motor (1), and the relay coil (2031) are connected in parallel to the negative terminal of the vehicle power supply (205).

3. The electric hydraulic lifting control system for a spare tire rack according to claim 2, characterized in that: The control circuit module includes a third switch (206), which is a normally open switch. The first end of the first switch (201), the first end of the second switch (202), and the first end of the contact switch (2032) are connected in parallel to the positive terminal of the vehicle power supply (205) through the third switch (206).

4. The electric hydraulic lifting control system for a spare tire rack according to claim 1, characterized in that: The working port includes a working port A (41) and a working port B (42). The working oil circuit includes a first working oil circuit (104) and a second working oil circuit (105). The hydraulic cylinder (7) has a rod chamber (72) and a rodless chamber (71). The first working oil circuit (104) connects the working port A (41) and the rodless chamber (71). The second working oil circuit (105) connects the working port B (42) and the rod chamber (72).

5. The electric hydraulic lifting control system for a spare tire rack according to claim 4, characterized in that: The solenoid valve (4) is a two-position four-way solenoid directional valve. The solenoid valve (4) includes a valve chamber and a solenoid valve core. The solenoid valve core is slidably disposed in the valve chamber. The valve chamber has a first position and a second position in which the solenoid valve core can be located. The solenoid valve core can slide between the first position and the second position. When the solenoid valve core is in the first position, the oil inlet P port (43) is connected to the working A port (41), and the oil return T port (44) is connected to the working B port (42); when the solenoid valve core is in the second position, the oil inlet P port (43) is connected to the working B port (42), and the oil return T port (44) is connected to the working A port (41).

6. The electric hydraulic lifting control system for a spare tire rack according to claim 4, characterized in that: The hydraulic lifting module also includes a two-way hydraulic lock (6), which is connected to the first working oil circuit (104) and the second working oil circuit (105). The two-way hydraulic lock (6) is used to control the opening and closing of the first working oil circuit (104) and the second working oil circuit (105) and to maintain the oil pressure.

7. The electric hydraulic lifting control system for a spare tire rack according to claim 6, characterized in that: The bidirectional hydraulic lock (6) includes a first check valve (61) and a second check valve (62). The first check valve (61) is connected in series to the first working oil circuit (104). The first check valve (61) has a first input port, a first output port and a first control port. The first input port is connected to the working port A (41) and the first output port is connected to the rodless chamber (71). The second check valve (62) has a second input port, a second output port and a second control port. The second input port is connected to the working port B (42) and the second output port is connected to the rod chamber (72). The bidirectional hydraulic lock (6) further includes a first control oil circuit (63) and a second control oil circuit (64). The first control oil circuit (63) connects the first control port and the working B port (42). The first control oil circuit (63) is used to control the first input port and the first output port to be connected. The second control oil circuit (64) connects the second control port and the working A port (41). The second control oil circuit (64) is used to control the second input port and the second output port to be connected.

8. The electric hydraulic lifting control system for a spare tire rack according to claim 1, characterized in that: The hydraulic lifting module also includes an overflow oil circuit (106), one end of which is connected to the oil outlet, and the other end of which is connected to the oil tank (3). An overflow valve (9) is provided in the overflow oil circuit (106).

9. The electric hydraulic lifting control system for a spare tire rack according to claim 1, characterized in that: A filter screen (10) is installed in the low-pressure oil circuit (101) of the pump.

10. The electric hydraulic lifting control system for a spare tire rack according to claim 1, characterized in that: The hydraulic lifting module also includes a base (5), and the motor (1), oil pump (2), oil tank (3), and solenoid valve (4) are all integrated on the base (5).

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