Inflation and deflation device capable of automatically maintaining tire pressure

Abstract

The invention provides an inflating and deflating device capable of automatically maintaining tire pressure. The inflating and deflating device comprises an inflating and deflating mechanism, a tire pressure monitoring mechanism and a control mechanism, the inflation and deflation mechanism comprises an air source, an inflation pipeline and a deflation pipeline, the inflation pipeline and the deflation pipeline are communicated with the tires respectively, the inflation end of the air source is connected with the inflation pipeline, an inflation valve is arranged on the inflation pipeline, and a deflation valve is arranged on the deflation pipeline. The tire pressure monitoring mechanism comprises a tire pressure monitoring air channel and a bourdon tube, the tire pressure monitoring air channel communicates with the tire and the bourdon tube, and the bourdon tube can deform along with the tire pressure change of the tire; tire pressure changes are detected through the Bourdon tube, and opening and closing of the inflation and deflation valve are controlled through the control mechanism. In this way, the air source can enter the tire through the valve, air in the tire can be exhausted through the valve, it is guaranteed that the tire pressure of the tire is kept within the optimal range, potential safety hazards caused by too low or too high tire pressure are avoided, and meanwhile the service life of the tire is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and particularly relates to an automatic tire pressure maintaining inflation and deflation device. Background Art

[0002] The existing automatic inflation and deflation system adjusts the tire pressure through electrical control and sensors, mainly relying on electronic valves, pressure sensors, and electronic control devices to monitor and adjust the tire pressure. Although this system can effectively maintain the tire pressure to a certain extent, there are still some problems. First, the electrical control system is vulnerable to electrical failures, especially in hilly operating environments, resulting in lower system stability than mechanical systems. Second, the inflation and deflation efficiency of the existing system is low, the energy consumption is high, and under extreme driving conditions in hilly areas, such as long downhill slopes or sharp accelerations, it may not be able to respond to tire pressure changes in real time. In addition, the durability of electrical components is poor, especially in high-temperature and high-load environments, they are easily damaged. Moreover, due to relying on electronic control, the existing system is difficult to cope with the complex and variable hilly terrain of the road surface. Especially when the tire pressure fluctuation is small, it cannot accurately adjust the tire pressure. Therefore, there is still room for improvement in the efficiency, energy consumption control, durability, and precise tire pressure adjustment of the existing automatic inflation and deflation system. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides an automatic tire pressure maintaining inflation and deflation device, which can automatically adjust the tire pressure through inflation and deflation, ensure that according to the current tire pressure during the working process, the tire pressure is automatically adjusted to the normal level to achieve the best inflation and deflation effect. It can automatically inflate and deflate when the tire pressure changes slightly, and realize better stability of the tire pressure of the vehicle under extreme driving conditions such as going up and down slopes in hilly areas.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides an automatic tire pressure maintaining inflation and deflation device, including an inflation and deflation mechanism, a tire pressure monitoring mechanism, and a control mechanism; the inflation and deflation mechanism includes a gas source and an inflation pipeline and a deflation pipeline respectively communicated with the tire, the inflation end of the gas source is connected to the inflation pipeline, an inflation valve is arranged on the inflation pipeline, and a deflation valve is arranged on the deflation pipeline; the tire pressure monitoring mechanism includes a tire pressure monitoring air duct and a Bourdon tube, the tire pressure monitoring air duct is respectively communicated with the tire and the Bourdon tube, and the Bourdon tube can deform with the change of the tire pressure; when the tire pressure decreases, the end of the Bourdon tube deforms forward and drives the inflation valve to open and the deflation valve to close through the control mechanism; when the tire pressure increases, the end of the Bourdon tube deforms reversely and drives the inflation valve to close and the deflation valve to open through the control mechanism.

[0006] Further, the control mechanism includes a lever structure, an inflating hydraulic rod, a deflating hydraulic rod, and a hydraulic oil circuit housing; one end of the Bourdon tube is connected to one end of the lever structure; a first vertical oil circuit, a horizontal oil circuit, and a second vertical oil circuit are sequentially communicated within the hydraulic oil circuit housing; the deflating hydraulic rod is movably arranged within the first vertical oil circuit, and its upper end is connected to a deflating valve; the inflating hydraulic rod is movably arranged within the second vertical oil circuit, and its upper end is connected to an inflating valve, and its lower end is movably connected to the other end of the lever structure; a pressure oil piece is arranged on the inflating hydraulic rod, and hydraulic oil is distributed between the lower end of the deflating hydraulic rod and the pressure oil piece.

[0007] Further, the inflating valve and the deflating valve have the same structure, and both include a valve seat, a valve housing, a spring, and a moving block; the valve housing is communicated with the inflating pipeline / the deflating pipeline, one end of the valve housing is fixed to the valve seat / the upper base, and the other end is fixedly connected to the inflating pipeline / the deflating pipeline; the moving block is slidably installed within the valve housing, two ends of the spring are respectively connected to the valve seat and one end of the moving block, and the other end of the moving block is connected to the inflating hydraulic rod / the deflating hydraulic rod; a stop block is respectively arranged within the inflating pipeline and the deflating pipeline. When the inflating pipeline / the deflating pipeline contacts the stop block, the inflating valve / the deflating valve is closed. When the inflating pipeline / the deflating pipeline is separated from the stop block, the inflating valve / the deflating valve is opened.

[0008] Further, the lever structure includes an adjusting rod, a fixing rod, and a connecting rod; the adjusting rod is parallel to the fixing rod; the upper end of the connecting rod is hinged to the adjusting rod, and the lower end is fixedly connected to the fixing rod; one end of the adjusting rod is connected to the Bourdon tube, and the other end is connected to the lower end of the inflating hydraulic rod.

[0009] Further, lever adjusting structures are respectively arranged on the adjusting rod and the fixing rod; the lever adjusting structure includes a slide rail, an iron block, a magnet, and an electromagnet; the slide rail is slidably connected to the adjusting rod / the fixing rod, and the iron block is fixed on the slide rail; the magnet and the electromagnet are respectively arranged on both sides of the slide rail, and both the magnet and the electromagnet are fixed to the adjusting rod / the fixing rod. The electromagnet is distributed on the side far from the Bourdon tube, and the magnet is distributed on the side close to the Bourdon tube; the upper end of the connecting rod is hinged to the slide rail of the adjusting rod, and the lower end is fixedly connected to the slide rail of the fixing rod; when the electromagnet is powered on, the iron block moves along with the slide rail to the electromagnet and adsorbs and fixes to the electromagnet. When the electromagnet is powered off, the iron block moves along with the slide rail to the magnet and adsorbs and fixes to the magnet.

[0010] Furthermore, an electromagnet energization adjustment mechanism is also provided; the electromagnet energization adjustment mechanism includes a housing and a hydraulic rod. The housing is connected to the fixed rod. The interior of the housing is hollow and includes a vertical section and upper and lower horizontal sections at both ends. An upper vertical tube communicating with it is provided above the upper horizontal section, and a lower vertical tube communicating with it is provided above the lower horizontal section. The lower end of the hydraulic rod is movably arranged in the vertical section of the housing, and the upper end extends outside the housing and is connected to an adjustment rod. The hydraulic rod is equipped with an upper pressure plate and a lower pressure plate distributed up and down. The cavity above the upper pressure plate is filled with electrolyte, and the cavity below the lower pressure plate is filled with electrolyte. The upper vertical tube is provided with two electrical interfaces distributed up and down, externally connected to a first power source, and forms a first parallel circuit with the upper and lower electromagnets. The lower vertical tube is provided with two electrical interfaces distributed up and down, externally connected to a second power source, and forms a second parallel circuit with the upper and lower electromagnets.

[0011] Furthermore, an upper extension section communicating with it is provided below the upper horizontal section. A spring and an upper stop block are arranged in the upper extension section. The upper stop block is movably arranged in the upper extension section. The upper end of the spring is connected to the upper stop block, and the lower end is connected to the inner wall of the end of the upper extension section. The electrolyte is filled in the cavity between the upper pressure plate and the upper stop block. A lower extension section communicating with it is provided below the lower horizontal section. A spring and a lower stop block are arranged in the lower extension section. The lower stop block is movably arranged in the lower extension section. The lower end of the spring is connected to the lower stop block, and the upper end is connected to the inner wall of the end of the lower extension section. The electrolyte is filled in the cavity between the lower pressure plate and the lower stop block.

[0012] Furthermore, a first one-way valve is provided on the inflation pipeline, and a second one-way valve is provided on the deflation pipeline.

[0013] Furthermore, the inflation / deflation mechanism, the tire pressure monitoring mechanism, and the control mechanism are integrated inside the housing. One end of the housing is provided with an air inlet / outlet pipe. A rolling bearing is provided on the outer edge of the opening of the air inlet / outlet pipe. The rolling bearing is fixedly connected to one end of the air delivery pipeline, and the other end of the air delivery pipeline is connected to the tire. A first partition is arranged in the air inlet / outlet pipe. The first partition divides the air inlet / outlet pipe into a tire pressure monitoring air passage and an inflation / deflation air passage. A second partition is arranged in the inflation / deflation air passage. The second partition divides the inflation / deflation air passage into an inflation pipeline and a deflation pipeline.

[0014] Furthermore, an upper base and a lower base are arranged inside the housing. The inflation pipeline and the deflation pipeline are arranged in the upper base. The hydraulic oil circuit housing is fixedly connected to the upper base. The tire pressure monitoring air passage is arranged in the lower base. The air inlet end of the Bourdon tube is fixedly connected to the lower base.

[0015] The beneficial effects of the present invention are:

[0016] (1) The present invention is connected with a pipe through which gas can flow at the tire. This pipe is connected to the air charging and discharging system and is provided with rolling bearings to ensure that the tire and the pipe can rotate independently, and the air charging and discharging system will not rotate therewith. The tire pressure is detected by a Bourdon tube, and a force feedback signal is generated according to the change of the tire pressure. The feedback signal controls the opening and closing of the air charging and discharging valve through a lever mechanism. In this way, the gas source can enter the tire through the valve, and the gas in the tire can be discharged through the valve.

[0017] (2) The system of the present invention can automatically adjust the length of the force arm according to the change of the tire pressure, so as to ensure that when the change of the tire pressure is small, the air charging and discharging operation can still be carried out accurately, and the tire pressure can be adjusted in real time. Through this adjustment method, it is ensured that the tire pressure is maintained within the optimal range, avoiding potential safety hazards caused by too low or too high tire pressure, and at the same time improving the service life of the tire and the handling performance of the vehicle. In addition, the system avoids the negative impact of air pressure fluctuation on the tire performance by accurately adjusting the air charging and discharging volume, so that the tire can always maintain the best performance under different driving conditions, thereby improving the stability and fuel efficiency of the vehicle. Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is Figure 1 an enlarged view of part A in

[0020] Figure 3 is Figure 1 an enlarged view of part B in

[0021] Figure 4 is another connection structure diagram of the adjusting rod, the hydraulic rod and the inflating hydraulic rod;

[0022] Figure 5 is Figure 2 an enlarged view of part C in

[0023] The reference numerals in the drawings are:

[0024] 1. Tire; 2. Air delivery pipeline; 3. Wheel hub; 4. Rolling bearing; 5. First partition; 6. Second partition; 7. Bourdon tube; 8. Air release pipeline; 9. Inflation pipeline; 10. Housing; 11. Upper base; 12. Air outlet; 13. Lower base; 14. Tire pressure monitoring air duct; 15. Inlet and outlet air pipe; 16. Lower electrolyte; 17. Fixed rod; 18. Lower vertical pipe; 19. Upper electrolyte; 20. Hydraulic rod; 21. Upper stop block; 22. Upper vertical pipe; 23. Magnet; 24. Electromagnet; 25. Inflation hydraulic rod; 26. Connecting rod; 27. Power supply line; 28. Second power supply; 29. Adjusting rod; 30. Iron block; 31. Slide rail; 32. Outer shell; 33. Lower stop block; 34. Air source; 35. Inflation valve; 36. Valve seat; 37. First one-way valve; 38. Second one-way valve; 39. Air release valve; 40. First power supply; 41. Air release hydraulic rod; 42. Hydraulic oil circuit housing; 43. Hydraulic oil; 44. Air source air inlet; 45. Second slide rail; 46. Valve outer shell; 47. Spring; 48. Moving block; 49. Stop block; 50. First slide rail; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod; 54. Fourth connecting rod. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] An automatic tire pressure maintaining inflation and deflation device provided by an embodiment of the present invention includes an inflation and deflation mechanism, a tire pressure monitoring mechanism and a control mechanism.

[0027] As Figure 1 shown, the tire assembly includes an air delivery pipeline 2, a tire 1 and a wheel hub 3. The air delivery pipeline 2 is connected to the tire 1 by means of threaded connection. The air delivery pipeline 2 serves as a passage inside the wheel hub 3 and extends from the wheel hub 3 to be connected to the automatic tire pressure maintaining inflation and deflation device of the present invention.

[0028] As Figure 2 and Figure 5As shown in the figure, the inflation and deflation mechanism includes a gas source 34, an inflation pipeline 9 and a deflation pipeline 8 which are respectively connected to the tire 1. The gas source 34 contains gas at normal tire pressure. The inflation end of the gas source 34 is threadedly connected to one end of the inflation pipeline 9. The other end of the inflation pipeline 9 is connected to the tire 1, and an inflation valve 35 is provided on the inflation pipeline 9. One end of the deflation pipeline 8 is connected to the tire 1, and the other end is an air outlet 12 (the air outlet 12 is responsible for discharging the gas inside the tire that exceeds the specified tire pressure), and a deflation valve 39 is provided on the deflation pipeline 8. The tire pressure monitoring mechanism includes a tire pressure monitoring air duct 14 and a Bourdon tube 7. One end of the tire pressure monitoring air duct 14 is connected to the tire 1, and the other end is connected to the Bourdon tube 7. The gas in the tire 1 can enter the Bourdon tube 7, that is, the air pressure in the Bourdon tube 7 is the same as the air pressure in the tire 1. The Bourdon tube 7 can deform with the change of the tire pressure of the tire 1 and generate a force feedback signal.

[0029] When the tire pressure decreases (less than the specified value), the end of the Bourdon tube 7 deforms forward and drives the inflation valve 35 to open and the deflation valve 39 to close through the control mechanism. The gas in the gas source 34 is filled into the tire 1 through the inflation pipeline 9 to increase the tire pressure of the tire 1. When the tire pressure increases (greater than the specified value), the end of the Bourdon tube 7 deforms reversely and drives the inflation valve 35 to close and the deflation valve 39 to open through the control mechanism. The inflation stops, and the excess gas in the tire 1 is discharged through the deflation pipeline 8.

[0030] Specifically, such as Figures 2 to 4As shown, the control mechanism includes a lever structure, an inflating hydraulic rod 25, a deflating hydraulic rod 41, and a hydraulic oil circuit housing 42. The end of the Bourdon tube 7 is connected (hinged) to one end of the lever structure. Inside the hydraulic oil circuit housing 42, a first vertical oil circuit, a horizontal oil circuit, and a second vertical oil circuit are arranged in sequence and connected. The deflating hydraulic rod 41 is movably arranged inside the first vertical oil circuit (the deflating hydraulic rod 41 is sealingly connected to the hydraulic oil circuit housing 42), and the upper end of the deflating hydraulic rod 41 is connected (or not connected) to the deflating valve 39. The inflating hydraulic rod 25 is movably arranged inside the second vertical oil circuit (the inflating hydraulic rod 25 is sealingly connected to the hydraulic oil circuit housing 42), the upper end of the inflating hydraulic rod 25 is connected (or not connected) to the inflating valve 35, and the lower end is movably connected to the other end of the lever structure. A pressure oil plate is arranged on the inflating hydraulic rod 25 (the pressure oil plate is sealingly connected to the hydraulic oil circuit housing 42), and the hydraulic oil is distributed between the lower end of the deflating hydraulic rod 41 and the pressure oil plate. When the tire pressure decreases (less than the specified value), the end of the Bourdon tube 7 drives one end of the lever structure to move downward, and the other end of the lever structure moves upward, thereby driving the inflating hydraulic rod 25 to move upward. The inflating hydraulic rod 25 generates pressure on the inflating valve 35 to open it, achieving the function of inflation. When the tire pressure increases (greater than the specified value), the end of the Bourdon tube 7 drives one end of the lever structure to move upward, and the other end of the lever structure moves downward, thereby driving the inflating hydraulic rod 25 to move downward. The inflating valve 35 closes, the pressure oil plate generates pressure on the hydraulic oil, causing the deflating hydraulic rod 41 to move upward. The deflating hydraulic rod 41 generates pressure on the deflating valve 39 to open it, achieving the function of deflation. The function of automatic inflation and deflation is achieved according to the above operations.

[0031] As a further preferred embodiment of the present invention, as Figure 5 shown, the inflating valve 35 and the deflating valve 39 have the same structure, and both include a valve seat 36, a valve housing 46, a spring 47, and a moving block 48.

[0032] Among them, the valve housing 46 is communicated with the inflating pipeline 9 / deflating pipeline 8. One end of the valve housing 46 is fixed to the valve seat 36 / upper base 11, and the other end is fixedly connected to the inflating pipeline 9 / deflating pipeline 8. The moving block 48 is slidably installed inside the valve housing 46, and the moving block 48 is sealingly connected to the inner wall of the valve housing 46. Both ends of the spring 47 are respectively connected to the valve seat 36 and one end of the moving block 48, and the other end of the moving block 48 is connected to the inflating hydraulic rod 25 / deflating hydraulic rod 41. A stop block 49 is respectively arranged inside the inflating pipeline 9 and the deflating pipeline 8. When the inflating pipeline 9 / deflating pipeline 8 contacts the stop block 49, the inflating valve 35 / deflating valve 39 closes, and when the inflating pipeline 9 / deflating pipeline 8 is separated from the stop block 49, the inflating valve 35 / deflating valve 39 opens.

[0033] During application, when the moving block 48 of the inflation valve 35 receives an upward thrust from the inflation hydraulic rod 25, the moving block 48 moves upward relative to the valve housing 46, compressing the spring 47 and deforming it. After the moving block 48 separates from the stop block 49, the inflation valve 35 opens, and the gas in the gas source 34 enters the inflation pipeline 9 and flows through the gap between the moving block 48 and the stop block 49 into the tire 1. The moving block 48 of the deflation valve 39 is always in sealed connection with the stop block 49 under the action of the spring 47, keeping the deflation valve 39 in a closed state. When the moving block 48 of the inflation valve 35 receives a downward force, the moving block 48 moves downward relative to the valve housing 46 and is in sealed connection with the stop block 49, keeping the inflation valve 35 in a closed state. During the downward movement of the inflation hydraulic rod 25, its oil pressing piece generates pressure on the hydraulic oil, causing the deflation hydraulic rod 41 to move upward. The moving block 48 of the deflation valve 39 receives a thrust from the deflation hydraulic rod 41 and moves upward, compressing the spring 47 and deforming it. The moving block 48 of the deflation valve 39 separates from the stop block 49, and the deflation valve 39 opens to achieve the deflation function.

[0034] As a further preference of the present invention, as Figure 3 shown, the lever structure includes an adjusting rod 29, a fixed rod 17, and a connecting rod 26. The adjusting rod 29 and the fixed rod 17 are parallel up and down and are both in a horizontal state. The upper end of the connecting rod 26 is hinged to the adjusting rod 29, and the lower end is fixedly connected to the fixed rod 17. The adjusting rod 29 can rotate around the hinge point. When one end of the adjusting rod 29 rises or falls, the other end rises or falls accordingly. One end of the adjusting rod 29 is connected to the Bourdon tube 7, and the other end is movably connected to the lower end of the inflation hydraulic rod 25.

[0035] As Figure 3 shown, a first slide rail 50 is provided at the end of the adjusting rod 29 connected to the inflation hydraulic rod 25. A first slide seat is slidably installed on the first slide rail 50, and a first hinge seat is provided (fixedly installed or hingedly installed) on the first slide seat. The lower end of the inflation hydraulic rod 25 is hinged to the first hinge seat.

[0036] In other embodiments of the present invention, another connection method between the adjusting rod 29 and the inflation hydraulic rod 25 is provided. As Figure 4 shown, a first connecting rod 51 and a second connecting rod 52 are provided at the end of the adjusting rod 29 connected to the inflation hydraulic rod 25. One end of the first connecting rod 51 is fixedly connected to the adjusting rod 29, one end of the second connecting rod 52 is hinged to the other end of the first connecting rod 51, and the other end of the second connecting rod 52 is hinged to the lower end of the inflation hydraulic rod 25.

[0037] Both of the above connection methods can achieve that when both ends of the adjusting rod 29 rise or fall, the inflation hydraulic rod 25 is driven to vertically rise or fall.

[0038] As a further preference of the present invention, asFigure 3 As shown, lever adjustment structures are respectively provided on the adjusting rod 29 and the fixed rod 17. The lever adjustment structure includes a slide rail 31, an iron block 30, a magnet 23, and an electromagnet 24.

[0039] Among them, the slide rail 31 is slidably connected to the adjusting rod 29 / fixed rod 17. The iron block 30 is fixed on the slide rail 31. The magnet 23 and the electromagnet 24 are respectively arranged on both sides of the slide rail 31, and both the magnet 23 and the electromagnet 24 are fixed on the adjusting rod 29 / fixed rod 17. The electromagnet 24 is distributed on the side far from the Bourdon tube 7, and the magnet 23 is distributed on the side close to the Bourdon tube 7. The upper end of the connecting rod 26 is hinged to the slide rail 31 of the adjusting rod 29, and the lower end is fixedly connected to the slide rail 31 of the fixed rod 17. When the electromagnet 24 is energized, the iron block 30 moves along with the slide rail 31 to the electromagnet 24 and is adsorbed and fixed to the electromagnet 24. When the electromagnet 24 is de-energized, the iron block 30 moves along with the slide rail 31 to the magnet 23 and is adsorbed and fixed to the magnet 23. By setting the lever adjustment structure, the length of the force arm of this device can be adjusted.

[0040] As a further preference of the present invention, as Figure 3 shown, this device is also provided with an electromagnet energization adjustment mechanism. The electromagnet energization adjustment mechanism includes a housing 32 and a hydraulic rod 20.

[0041] Among them, the bottom of the housing 32 is connected to the fixed rod 17 (fixed connection or hinged connection). The interior of the housing 32 is hollow, including a vertical section and upper and lower horizontal sections at both ends. An upper vertical tube 22 communicating therewith is arranged above the upper horizontal section, and a lower vertical tube 18 communicating therewith is arranged above the lower horizontal section. The lower end of the hydraulic rod 20 is movably arranged in the vertical section of the housing 32, and the upper end extends outside the housing 32 and is movably connected to the adjusting rod 29. The hydraulic rod 20 is hermetically connected to the housing 32. The hydraulic rod 20 is equipped with an upper pressure plate and a lower pressure plate distributed up and down. Both the upper pressure plate and the lower pressure plate are hermetically and movably connected to the housing 32. The cavity above the upper pressure plate is filled with electrolyte, and the cavity below the lower pressure plate is filled with electrolyte. The upper vertical tube 22 is provided with two electrical interfaces distributed up and down, externally connected to a first power source 40, and forms a first parallel circuit with the upper and lower electromagnets 24; the lower vertical tube 18 is provided with two electrical interfaces distributed up and down, externally connected to a second power source 28, and forms a second parallel circuit with the upper and lower electromagnets 24.

[0042] As Figure 3 shown, one end of the adjusting rod 29 connected to the hydraulic rod 20 is provided with a second slide rail 45. A second sliding seat is slidably installed on the second slide rail 45, and a second hinge seat is arranged (fixedly installed or hingedly installed) on the second sliding seat. The upper end of the hydraulic rod 20 is hinged to the second hinge seat.

[0043] In other embodiments of the present invention, another connection method of the adjusting rod 29 and the hydraulic rod 20 is provided, as Figure 4As shown in the figure, at one end of the adjusting rod 29 connected to the hydraulic rod 20, a third connecting rod 53 and a fourth connecting rod 54 are provided. One end of the third connecting rod 53 is fixedly connected to the adjusting rod 29. The other end of the fourth connecting rod 54 is hinged to the other end of the third connecting rod 53, and the other end of the fourth connecting rod 54 is hinged to the upper end of the hydraulic rod 20.

[0044] Both of the above two connection methods can drive the hydraulic rod 20 to vertically rise or fall when the two ends of the adjusting rod 29 rise or fall.

[0045] When the tire pressure increases (greater than the specified value), the end of the Bourdon tube 7 drives the end of the adjusting rod 29 to move upward, and the hydraulic rod 20 also moves upward accordingly. The upper pressing plate of the hydraulic rod 20 generates pressure on the electrolyte above it, causing the electrolyte to flow into the upper vertical tube 22. At this time, the first parallel circuit is in a closed state, and the upper and lower electromagnets 24 are energized. The upper and lower iron blocks 30 respectively move along the slide rails 31 to the electromagnets 24 and are adsorbed and fixed to the electromagnets 24. When the tire pressure decreases (less than the specified value), the end of the Bourdon tube 7 drives the end of the adjusting rod 29 to move downward, and the hydraulic rod 20 also moves downward accordingly. The lower pressing plate of the hydraulic rod 20 generates pressure on the electrolyte below it, causing the electrolyte to flow into the lower vertical tube 18. At this time, the second parallel circuit is in a closed state, and the upper and lower electromagnets 24 are energized. The upper and lower iron blocks 30 respectively move along the slide rails 31 to the electromagnets 24 and are adsorbed and fixed to the electromagnets 24. That is to say, the up and down movement of the hydraulic rod 20 can make the electrolyte flow into the upper vertical tube 22 or the lower vertical tube 18. The height change of the electrolyte can control the on and off of the power line, so that the electromagnet 24 is energized or de-energized. When the tire pressure is too high or too low, the force can be adjusted by adjusting the length of the force arm, so as to ensure that the inflation and deflation operations can be accurately performed even when the tire pressure changes slightly, and the tire pressure can be adjusted in real time.

[0046] As a further preference of the present invention, as Figure 3 shown, an upper extension section communicating with the upper horizontal section is provided below the upper horizontal section. A spring and an upper stopper 21 are arranged in the upper extension section. The upper stopper 21 is movably and hermetically arranged in the upper extension section. The upper end of the spring is connected to the upper stopper 21, and the lower end of the spring is connected to the inner wall of the end of the upper extension section. The electrolyte is filled in the cavity between the upper pressing plate and the upper stopper 21. A lower extension section communicating with the lower horizontal section is provided below the lower horizontal section. A spring and a lower stopper 33 are arranged in the lower extension section. The lower stopper 33 is movably and hermetically arranged in the lower extension section. The lower end of the spring is connected to the lower stopper 33, and the upper end of the spring is connected to the inner wall of the end of the lower extension section. The electrolyte is filled in the cavity between the lower pressing plate and the lower stopper 33. If the force is large enough, the electrolyte will squeeze the upper stopper 21 / lower stopper 33 to move downward or upward.

[0047] As a further preference of the present invention, as Figure 5As shown, a first one-way valve 37 is provided on the inflation pipeline 9, and a second one-way valve 38 is provided on the deflation pipeline 8 to ensure the one-way flow of gas in the inflation pipeline 9 and the deflation pipeline 8.

[0048] As a further preference of the present invention, as Figures 1 to 2 shown, the inflation and deflation mechanism, the tire pressure monitoring mechanism and the control mechanism are integrated inside the housing 10. The housing 10 is a cuboid outer shell structure with an internal cavity. An upper base 11 and a lower base 13 are provided inside the housing 10, and the upper base 11 and the lower base 13 are fixedly welded to the housing 10.

[0049] One end of the housing 10 is provided with an air inlet and outlet pipe 15. A rolling bearing 4 is provided at the opening outer edge of the air inlet and outlet pipe 15. The rolling bearing 4 is connected to one end of the air delivery pipeline 2 (the air delivery pipeline 2 is connected to the inner ring of the rolling bearing 4, while the air inlet and outlet pipe 15 is connected to the outer ring of the rolling bearing 4, so that gas can freely enter and exit between the tire 1 and the inflation and deflation system. Through the rolling bearing 4, it is ensured that the inflation and deflation system does not rotate along with the air delivery pipeline 2). The other end of the air delivery pipeline 2 is communicated with the tire 1. A first partition 5 is provided inside the air inlet and outlet pipe 15. The first partition 5 divides the air inlet and outlet pipe 15 into an independent tire pressure monitoring air passage 14 and an inflation and deflation air passage. A second partition 6 is provided inside the inflation and deflation air passage. The second partition 6 divides the inflation and deflation air passage into an independent inflation pipeline 9 and a deflation pipeline 8. The inflation pipeline 9 and the deflation pipeline 8 are opened in the upper base 11, and the hydraulic oil circuit housing 42 is fixedly connected to the upper base 11. The tire pressure monitoring air passage 14 is opened in the lower base 13. The air inlet end of the Bourdon tube 7 is fixedly connected to the lower base 13. The fixing rod 17 is fixedly connected to the lower base 13 by bolts, and the housing 10 is connected to the fixing rod 17 by bolts.

[0050] An automatic tire pressure maintaining inflation and deflation device provided by the present invention can be used for agricultural machinery operations facing hilly operations. The working principle is as follows:

[0051] During the driving process of the vehicle, the device of the present invention automatically inflates and deflates the tire in real time according to the tire pressure to ensure the effect of stable tire pressure under different conditions.

[0052] In the initial state, since under normal tire pressure, the adjusting rod 29 stays in the horizontal position, the height of the electrolyte does not contact the power supply line 27, the circuit is disconnected, the electromagnet 24 is not powered on. Initially, the magnet 23 is attracted to the iron block 30 on the slide rail 31. The magnetic force of the electromagnet 24 is higher than that of the magnet 23. In the case where the electromagnet 24 is not powered on, the iron block 30 on the slide rail 31 is not attracted to the electromagnet 24.

[0053] When the tire pressure change is relatively low, the inflation hydraulic rod 25 cannot push the inflation valve 35, and the deflation hydraulic rod 41 cannot push the deflation valve 39. Therefore, a force arm automatic adjustment device is designed to change the magnitude of the force by changing the force arm, so that the inflation hydraulic rod 25 can push the inflation valve 35 and the deflation hydraulic rod 41 can push the deflation valve 39 to achieve inflation and deflation.

[0054] The second partition 6, the first one-way valve 37, and the second one-way valve 38 are designed in this solution to prevent the gas from the gas source from entering the deflation valve 39, so that inflation cannot be carried out.

[0055] When the tire pressure increases:

[0056] The Bourdon tube 7 expands, and then the Bourdon tube 7 deforms and generates an upward force. The adjusting rod 29 acts, causing the hydraulic rod 20 and the inflation hydraulic rod 25 to act, moving upward and downward respectively. When the hydraulic rod 20 moves upward, it will squeeze the upper electrolyte 19, so that the upper electrolyte 19 squeezes the upper stop block 21. If the force cannot reach the previously designed standard, that is, after being converted by the lever principle, the deflation hydraulic rod 41 generates a large enough force to push the deflation valve 39, then the upper electrolyte 19 will not push open the upper stop block 21, so that the electrolyte will not enter the space below the upper stop block 21, resulting in the electrolyte rising to the highest point where the upper vertical tube 22 is joined to the power supply line 27. The electromagnet 24 is energized, and the electromagnet 24 attracts the slide rail 31, so that the force of the deflation hydraulic rod 41 increases, and then the deflation hydraulic rod 41 generates a large enough force to push the deflation valve 39 to achieve deflation. When the inflation hydraulic rod 25 moves downward, it makes the deflation hydraulic rod 41 move upward through the hydraulic oil 43, and then pushes open the deflation valve 39, so that the gas enters the pipeline where the second one-way valve 38 is located from the tire 1 until the air outlet 12. When the tire pressure returns to the normal value, the Bourdon tube 7 contracts to its original position, causing the hydraulic rod 20 and the inflation hydraulic rod 25 to act, moving downward and upward respectively. When the hydraulic rod 20 moves downward, the electrolyte in the upper vertical tube 22 drops to its original position, the electromagnet 24 is de-energized, and the magnet 23 attracts the slide rail 31, so that the slide rail 31 returns to its original position. After the inflation hydraulic rod 25 moves upward, since the action of the inflation hydraulic rod 25 on the hydraulic oil 43 disappears, the deflation valve 39 closes under the action of the spring, and the hydraulic oil 43 returns to its initial position under the action of the spring.

[0057] When the tire pressure decreases:

[0058] The Bourdon tube 7 contracts, and then the Bourdon tube 7 deforms and generates a downward force, causing the adjusting rod 29 to act, which in turn causes the hydraulic rod 20 and the pneumatic hydraulic rod 25 to act, moving downward and upward respectively. The pneumatic hydraulic rod 25 moves upward, thereby pushing open the pneumatic valve 35, so that gas enters the pipeline where the first one-way valve 37 is located from the gas source 34 and finally returns to the tire 1. When the hydraulic rod 20 moves downward, it will squeeze the lower electrolyte 16, causing the electrolyte to move in the direction of the lower stopper 33. If the force cannot reach the previously designed standard, that is, after conversion by the lever principle, the pneumatic hydraulic rod 25 generates a large enough force to push open the pneumatic valve 35, then the lower electrolyte 16 will not push open the lower stopper 33, so that the lower electrolyte 16 will not enter the space above the lower stopper 33, resulting in the electrolyte rising to the highest point where the lower vertical tube 18 is joined to the power line 27. The electromagnet 24 is energized, and the electromagnet 24 attracts the slide rail 31, thereby increasing the force of the pneumatic hydraulic rod 25, and then the pneumatic hydraulic rod 25 generates a large enough force to push open the pneumatic valve 35 to achieve inflation. When the tire pressure returns to the normal value, the Bourdon tube 7 expands to its original position, causing the hydraulic rod 20 and the pneumatic hydraulic rod 25 to act, moving upward and downward respectively. After the pneumatic hydraulic rod 25 moves downward, since the acting force of the pneumatic hydraulic rod 25 on the pneumatic valve 35 disappears, the pneumatic valve 35 closes under the action of the spring 47. When the hydraulic rod 20 moves upward, the lower electrolyte 16 in the lower vertical tube 18 drops to its original position, the electromagnet 24 is de-energized, and the magnet 23 attracts the slide rail 31, thereby restoring the slide rail 31 to its original position.

[0059] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A device for automatically maintaining tire pressure inflation and deflation, characterized in that: Including inflation and deflation mechanism, tire pressure monitoring mechanism and control mechanism; The inflation and deflation mechanism comprises an air source (34) and an inflation pipe (9) and a deflation pipe (8) respectively connected to the tire (1); the inflation end of the air source (34) is connected to the inflation pipe (9); an inflation valve (35) is provided on the inflation pipe (9); and a deflation valve (39) is provided on the deflation pipe (8); The tire pressure monitoring mechanism comprises a tire pressure monitoring airway (14) and a Bourdon tube (7), wherein the tire pressure monitoring airway (14) is connected to the tire (1) and the Bourdon tube (7) respectively, and the Bourdon tube (7) can deform as the tire pressure of the tire (1) changes; when the tire pressure decreases, the end of the Bourdon tube (7) deforms in a positive direction and drives the inflation valve (35) to open and the deflation valve (39) to close through the control mechanism; when the tire pressure increases, the end of the Bourdon tube (7) deforms in a negative direction and drives the inflation valve (35) to close and the deflation valve (39) to open through the control mechanism.

2. The automatic tire pressure maintaining inflation and deflation device according to claim 1, characterized in that: The control mechanism comprises a lever structure, an inflation hydraulic rod (25), an deflation hydraulic rod (41) and a hydraulic oil circuit housing (42); the end of the Bourdon tube (7) is connected to one end of the lever structure; The hydraulic oil circuit housing (42) is provided with a first vertical oil circuit, a horizontal oil circuit and a second vertical oil circuit which are connected in sequence; the deflation hydraulic rod (41) is movably arranged in the first vertical oil circuit, and its upper end is connected to the deflation valve (39); the inflation hydraulic rod (25) is movably arranged in the second vertical oil circuit, its upper end is connected to the inflation valve (35), and its lower end is movably connected to the other end of the lever structure; an oil pressure plate is provided on the inflation hydraulic rod (25), and hydraulic oil is distributed between the lower end of the deflation hydraulic rod (41) and the oil pressure plate.

3. The automatic tire pressure maintaining inflation and deflation device according to claim 2, characterized in that: The inflation valve (35) and the deflation valve (39) have the same structure, and both include a valve seat (36), a valve housing (46), a spring (47) and a moving block (48); The valve housing is connected to the inflation pipe (9) / deflation pipe (8), one end of the valve housing is fixed to the valve seat (36), and the other end is fixedly connected to the inflation pipe (9) / deflation pipe (8); the moving block is slidably mounted inside the valve housing, the two ends of the spring are respectively connected to the valve seat (36) and one end of the moving block, and the other end of the moving block is connected to the inflation hydraulic rod (25) / deflation hydraulic rod (41); The inflation pipe (9) and the deflation pipe (8) are respectively provided with a block (49); when the inflation pipe (9) / deflation pipe (8) contacts the block (49), the inflation valve (35) / deflation valve (39) is closed; when the inflation pipe (9) / deflation pipe (8) is separated from the block (49), the inflation valve (35) / deflation valve (39) is opened.

4. The automatic tire pressure maintaining inflation and deflation device according to claim 2, characterized in that: The lever structure comprises an adjusting rod (29), a fixing rod (17) and a connecting rod (26); The adjusting rod (29) is parallel to the fixing rod (17); the upper end of the connecting rod (26) is hinged to the adjusting rod (29), and the lower end is fixedly connected to the fixing rod (17); one end of the adjusting rod (29) is connected to the Bourdon tube (7), and the other end is connected to the lower end of the inflation hydraulic rod (25).

5. The automatic tire pressure maintaining inflation and deflation device according to claim 4, characterized in that: The adjusting rod (29) and the fixing rod (17) are respectively provided with a lever adjusting structure; The lever adjustment structure comprises a slide rail (31), an iron block (30), a magnet (23) and an electromagnet (24); The slide rail (31) is slidably connected to the adjusting rod (29) / fixing rod (17), and the iron block (30) is fixed on the slide rail (31); the magnet (23) and the electromagnet (24) are respectively arranged on both sides of the slide rail (31), and the magnet (23) and the electromagnet (24) are both fixed on the adjusting rod (29) / fixing rod (17), the electromagnet (24) is distributed on a side away from the Bourdon tube (7), and the magnet (23) is distributed on a side close to the Bourdon tube (7); The upper end of the connecting rod (26) is hinged to the slide rail (31) of the adjusting rod (29), and the lower end is fixedly connected to the slide rail (31) of the fixing rod (17); When the electromagnet (24) is powered on, the iron block (30) moves to the electromagnet (24) along the slide rail (31) and is fixedly attracted to the electromagnet (24). When the electromagnet (24) is powered off, the iron block (30) moves to the magnet (23) along the slide rail (31) and is fixedly attracted to the magnet (23).

6. The automatic tire pressure maintaining inflation and deflation device according to claim 5, characterized in that: An electromagnet power-on adjustment mechanism is also provided; The electromagnet energizing adjustment mechanism comprises a housing (32) and a hydraulic rod (20). The shell (32) is connected to the fixing rod (17); the shell (32) is hollow inside and includes a vertical section and an upper horizontal section and a lower horizontal section at both ends; an upper vertical tube (22) is arranged above the upper horizontal section and is in communication with the upper horizontal section; and a lower vertical tube (18) is arranged above the lower horizontal section and is in communication with the lower horizontal section; The lower end of the hydraulic rod (20) is movably arranged in the vertical section of the housing (32), and the upper end extends outside the housing (32) and is connected to the adjustment rod (29); the hydraulic rod (20) is equipped with an upper pressing plate and a lower pressing plate distributed up and down, the cavity above the upper pressing plate is filled with electrolyte, and the cavity below the lower pressing plate is filled with electrolyte; The upper vertical tube (22) is provided with two electrical interfaces distributed up and down, connected to a first power source (40) externally, and forms a first parallel circuit with the upper and lower electromagnets (24); the lower vertical tube (18) is provided with two electrical interfaces distributed up and down, connected to a second power source (28) externally, and forms a second parallel circuit with the upper and lower electromagnets (24).

7. The automatic tire pressure maintaining inflation and deflation device according to claim 6, characterized in that: An upper extension section connected to the upper horizontal section is provided below the upper horizontal section, a spring and an upper stopper (21) are provided in the upper extension section, the upper stopper (21) is movably provided in the upper extension section, the upper end of the spring is connected to the upper stopper (21), and the lower end is connected to the inner wall of the end of the upper extension section, and the electrolyte is filled in the cavity between the upper pressure plate and the upper stopper (21); A lower extension section connected to the lower horizontal section is provided below the lower horizontal section, a spring and a lower stopper (33) are provided in the lower extension section, the lower stopper (33) is movably provided in the lower extension section, the lower end of the spring is connected to the lower stopper (33), and the upper end is connected to the inner wall of the end of the lower extension section, and the electrolyte is filled in the cavity between the lower pressure plate and the lower stopper (33).

8. The automatic tire pressure maintaining inflation and deflation device according to claim 1, characterized in that: The inflation pipe (9) is provided with a first one-way valve (37), and the deflation pipe (8) is provided with a second one-way valve (38).

9. The automatic tire pressure maintaining inflation and deflation device according to claim 2, characterized in that: The inflation and deflation mechanism, tire pressure monitoring mechanism and control mechanism are integrated inside the housing (10); One end of the housing (10) is provided with an air inlet and outlet pipe (15), the outer edge of the opening of the air inlet and outlet pipe (15) is provided with a rolling bearing (4), the rolling bearing (4) is fixedly connected to one end of the air delivery pipeline (2), and the other end of the air delivery pipeline (2) is connected to the tire (1); A first partition (5) is arranged in the air inlet and outlet pipes (15), and the first partition (5) divides the air inlet and outlet pipes (15) into a tire pressure monitoring airway (14) and an inflation and deflation airway; a second partition (6) is arranged in the inflation and deflation airway, and the second partition (6) divides the inflation and deflation airway into an inflation pipe (9) and an deflation pipe (8).

10. The automatic tire pressure maintaining inflation and deflation device according to claim 9, characterized in that: An upper base (11) and a lower base (13) are arranged in the housing (10); The inflation pipe (9) and the deflation pipe (8) are provided in the upper base (11), and the hydraulic oil circuit housing (42) is fixedly connected to the upper base (11); The tire pressure monitoring airway (14) is opened in the lower base (13), and the air inlet end of the Bourdon tube (7) is fixedly connected to the lower base (13).

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