Air pump and vehicle with same

Abstract

The utility model discloses an air pump and a vehicle with the same. The air pump comprises an air cylinder, a piston assembly, a planetary speed reduction assembly and a motor, an air cylinder cavity is formed in the air cylinder, the piston assembly comprises a piston frame and a piston, the piston is arranged at at least one end of the piston frame and movably arranged in the air cylinder cavity, and the planetary speed reduction assembly is connected with the piston frame through a crankshaft. The motor is provided with a motor shaft, and the motor shaft is connected with the planetary speed reduction assembly so as to drive the piston to move in the air cylinder cavity through the planetary speed reduction assembly and the crankshaft. The vehicle comprises a pneumatic device and the air pump, and the air pump is connected with the pneumatic device and used for supplying compressed air to the pneumatic device. According to the air pump, the motor is connected with the piston assembly through the planetary speed reduction assembly and the crankshaft, and therefore the air pump is compact in structure, small in size, light in weight, small in size and high in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compression technical field, specifically, relate to a kind of air pump and vehicle with it. BACKGROUND

[0002] Air pump is air compression equipment, for example, widely used in such as off-road vehicle, sport utility vehicle (SUV) etc. with air suspension system in vehicle, for the air spring of air suspension system Supply compressed air. In the related art, due to the limited installation space in vehicle, air pump usually adopts for example the low-speed DC motor with rated speed lower than 4000rpm to drive piston through crank connecting rod, and the low-speed DC motor has low speed, large moment of inertia, large volume, slow start-stop response, which leads to large overall size of air pump. In addition, in the related art, the compressor with motor driving piston through speed reducer and crank connecting rod mechanism is not suitable for vehicle air pump, and the structure and arrangement of speed reducer and motor lead to large size and volume of compressor, in addition, the connecting rod of crank connecting rod mechanism has large size, and large space is required for operation, which is not suitable for vehicle use. SUMMARY

[0003] The utility model aims at at least one of the technical problems in the related art to some extent.

[0004] Therefore, the embodiment of the utility model provides a compact structure, small volume and small-sized air pump.

[0005] The air pump of the utility model embodiment comprises cylinder, piston assembly, planetary speed reducer assembly and motor, the cylinder has cylinder cavity in it, the piston assembly comprises piston frame and piston, the piston is arranged at least one end of the piston frame and is movably arranged in the cylinder cavity, the planetary speed reducer assembly is connected with the piston frame through crankshaft, the motor has motor shaft, the motor shaft is connected with the planetary speed reducer assembly, to drive the piston to move in the cylinder cavity through the planetary speed reducer assembly and the crankshaft.

[0006] The air pump of the utility model embodiment, motor is connected with piston assembly through planetary speed reducer assembly and crankshaft, so that the air pump has compact structure, small volume, light weight, miniaturization and high applicability.

[0007] In some embodiments, the planetary reduction assembly comprises an inner ring, a planet carrier, a sun gear and a plurality of planet gears, the planet gears are rotatably mounted on the planet carrier through planet gear shafts, the sun gear is mounted on the motor shaft, the inner ring is connected with the motor housing of the motor, the planet gears are respectively engaged with the sun gear and the inner ring, the crankshaft comprises a main shaft portion and an eccentric shaft portion, the main shaft portion is connected with the planet carrier, the central axis of the main shaft portion is coaxial with the central axis of the planet carrier, the central axis of the inner ring and the central axis of the motor shaft, the eccentric shaft portion is connected with the main shaft portion, the central axis of the eccentric shaft portion is eccentric relative to the central axis of the main shaft portion, and the eccentric shaft portion is connected with the piston carrier.

[0008] In some embodiments, the main shaft portion is provided with a balance block, the planet carrier is integrally formed with the main shaft portion, the main shaft portion is provided with an assembly hole, and the eccentric shaft portion is fitted in the assembly hole and one end of the eccentric shaft portion extends out of the assembly hole.

[0009] In some embodiments, the inner ring comprises a cylinder body and an annular boss, the annular boss is arranged on the inner circumferential wall of the cylinder body, the annular boss defines a fitting hole at one end of the cylinder body, the inner circumferential wall surface of the annular boss is formed with inner teeth, the end portion of the motor housing is provided with a reduced-diameter fitting portion, the fitting portion is fitted in the fitting hole, the one end of the cylinder body is butted with one end of the motor housing, and the outer circumferential surface of the cylinder body is flush with the outer circumferential surface of the motor housing.

[0010] In some embodiments, the piston carrier is provided with a mounting groove, a piston bearing is mounted in the mounting groove, and one end of the eccentric shaft portion is fitted with the piston bearing.

[0011] In some embodiments, the cylinder cavity is one, the piston is one and is arranged at the first end of the piston carrier, and the planetary reduction assembly is connected with the second end of the piston carrier through the crankshaft.

[0012] In some embodiments, the cylinder cavity includes a first cylinder cavity and a second cylinder cavity, the piston assembly includes a first piston and a second piston, the first piston is arranged at a first end of the piston frame, the first piston is movably fitted in the first cylinder cavity and defines a first compression chamber in the first cylinder cavity, the second piston is arranged at a second end of the piston frame, the second piston is movably fitted in the second cylinder cavity and defines a second compression chamber in the second cylinder cavity, the first compression chamber and the second compression chamber are communicated through a communication passage, the planetary reduction assembly is connected to the middle part of the piston frame through the crankshaft, wherein the first piston is larger than the second piston, the pressure in the first compression chamber is lower than the pressure in the second compression chamber, and the communication passage is formed in the cylinder or in the piston assembly or by a separate bypass pipe.

[0013] In some embodiments, the motor is a direct current motor, and the rotation speed of the motor is greater than 4000 revolutions per minute.

[0014] In some embodiments, the rotation speed of the motor is greater than 8000 revolutions per minute.

[0015] The embodiment of the utility model also proposes a vehicle.

[0016] The vehicle of the embodiment of the utility model includes a pneumatic device and the air pump according to any one of the above embodiments, the air pump is connected with the pneumatic device, and is used for supplying compressed air to the pneumatic device. ACCOUT OF DRAWINGS

[0017] Figure 1 It is the explosion schematic diagram of the single-stage compression air pump of the embodiment of the utility model.

[0018] Figure 2 It is the schematic diagram of the piston assembly of the single-stage compression air pump of the embodiment of the utility model.

[0019] Figure 3 It is the explosion schematic diagram of the two-stage compression air pump of the embodiment of the utility model.

[0020] Figure 4 It is the sectional view schematic diagram of the two-stage compression air pump of the embodiment of the utility model.

[0021] Figure 5 It is the sectional view schematic diagram of the planetary reduction assembly and the motor of the air pump of the embodiment of the utility model after assembly.

[0022] Figure 6 It is the explosion schematic diagram of the planetary reduction assembly and the motor of the air pump of the embodiment of the utility model.

[0023] Figure 7It is the three-dimensional schematic view of the crankshaft of the planetary reduction assembly of the air pump of the embodiment of the utility model.

[0024] Figure 8 It is the schematic view of the vehicle of the embodiment of the utility model.

[0025] Reference signs:

[0026] 100, vehicle; 1001, air pump; 10011, single-stage compression air pump; 10012, two-stage compression air pump; 1002, pneumatic device;

[0027] 1, cylinder; 101, cylinder cavity; 1011, first cylinder cavity; 1012, second cylinder cavity; 1021, first compression chamber; 1022, second compression chamber; 11, cylinder body; 111, intake passage; 112, front bearing; 113, intake port; 114, exhaust port; 12, cylinder sleeve; 13, cylinder cover; 14, intake cover; 141, intake hole; 15, exhaust valve;

[0028] 2, piston assembly; 201, communication air channel; 21, piston frame; 211, mounting groove; 212, piston bearing; 22, piston; 221, first piston; 222, second piston;

[0029] 3, planetary reduction assembly; 301, matching hole; 31, inner gear ring; 311, barrel; 312, annular boss; 32, planet carrier; 321, assembly groove; 322, rear bearing; 33, sun gear; 34, planet gear; 35, planet gear shaft;

[0030] 4, motor; 401, matching part; 41, motor shaft; 42, motor shell; 43, motor rear end cover; 44, rotor; 45, stator; 46, rotor front bearing; 47, rotor rear bearing; 48, sealing ring;

[0031] 5, crankshaft; 51, main shaft part; 511, assembly hole; 52, eccentric shaft part; 53, balance block;

[0032] 6, air reservoir;

[0033] 7, dryer; 71, air outlet;

[0034] 8, valve piece. DETAILED DESCRIPTION

[0035] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0036] The air pump of the embodiment of the utility model is described below in combination with the drawings.

[0037] As Figures 1-8 shown, the air pump 1001 of the embodiment of the utility model includes a cylinder 1, a piston assembly 2, a planetary reduction assembly 3 and a motor 4.

[0038] The cylinder 1 has a cylinder cavity 101 inside, the piston assembly 2 includes a piston holder 21 and a piston 22, the piston holder 21 can also be commonly called a piston rod, the piston 22 is arranged at least one end of the piston holder 21, the piston 22 is commonly rigidly connected with the piston holder 21, for example, the piston 22 can be integrally formed with the piston holder 21. The piston 22 is movably arranged inside the cylinder cavity 101 to define a compression chamber inside the cylinder cavity 101, and the piston 22 reciprocates inside the cylinder cavity 101 to complete the compression and discharge of gas.

[0039] The piston assembly 2 can include one piston 22 arranged at one end of the piston holder 21, and the cylinder cavity 101 and the compression chamber are both one, and the air pump 1001 is called a single-stage compression air pump 10011. The piston assembly 2 can include two pistons 22 arranged at both ends of the piston holder 21 respectively, and the cylinder cavity 101 and the compression chamber are both two, the sizes of the two pistons 22 are usually different, the gas compressed in one compression chamber enters another compression chamber for re-compression, the one compression chamber can be called a first-stage or low-pressure compression chamber, and the other compression chamber can be called a second-stage or high-pressure compression chamber, and the air pump 1001 is called a two-stage compression air pump 10012. The single-stage compression air pump 10011 and the two-stage compression air pump 10012 will be described in the following specific embodiments.

[0040] The piston 22 and the wall of the cylinder cavity 101 maintain good sealing to prevent gas leakage. For example, a sealing ring or other sealing element is arranged on the piston 22 to ensure that gas does not escape from the gap between the piston 22 and the inner wall of the cylinder 1.

[0041] The planetary reduction assembly 3 is connected with the piston holder 21 through a crankshaft 5, the motor 4 has a motor shaft 41 connected with the planetary reduction assembly 3, and the motor 4 drives the piston 22 to move inside the cylinder cavity 101 through the planetary reduction assembly 3 and the crankshaft 5. In other words, the motor 4 drives the crankshaft 5 to rotate through the planetary reduction assembly 3, and the crankshaft 5 drives the piston 22 to reciprocate inside the cylinder cavity 101 through the piston holder 21, thereby completing the compression and discharge of gas in the compression chamber.

[0042] The air pump 1001 of the embodiment of the utility model, the motor 4 drives the piston 22 through the planetary reduction assembly 3 and the crankshaft 5, the reduction ratio of the planetary reduction assembly 3 is large, a high-speed motor can be used, the required space is small, and the overall volume and weight of the air pump 1001 are reduced.

[0043] And, compared with the ordinary speed reducer, the transmission efficiency of the planetary reduction assembly 3 is high, which can not only reduce the power consumption required by the motor 4, thereby reducing the energy consumption of the air pump 1001, but also improve the working efficiency of the air pump 1001, and is especially suitable for being used in the air pump 1001 for vehicles.

[0044] The air pump of some specific embodiments of the present application will be described below in combination with the drawings.

[0045] As shown in Figures 1-2 and Figures 5-7 , the air pump 1001 of some specific embodiments of the present application comprises a cylinder 1, a piston assembly 2, a planetary reduction assembly 3, a motor 4 and an air reservoir 6.

[0046] As shown in Figure 1 , the cylinder 1 comprises a cylinder body 11, a cylinder sleeve 12, a cylinder cover 13, an air inlet cover 14 and an exhaust valve 15. The cylinder cover 13 is installed at the upper end of the cylinder body 11, for example, is detachably connected with the cylinder body 11 through bolts. The cylinder sleeve 12 is installed in the cylinder body 11, and the cylinder sleeve 12 defines an air cylinder cavity 101. The air inlet cover 14 can be detachably installed on one side of the cylinder body 11, for example, the left side in Figure 1 . The air inlet cover 14 has an air inlet hole 141, and the cylinder body 11 has an air inlet passage 111 communicating with the air inlet hole 141. The exhaust valve 15 is installed between the cylinder cover 13 and the cylinder body 11 and above the air cylinder cavity 101, and is used for discharging compressed gas. The cylinder cover 13 is connected with the air reservoir 6, and the cylinder cover 13 has an air outlet passage (not shown in the figure).

[0047] The piston assembly 2 comprises a piston holder 21 and a piston 22, the piston 22 is arranged at the upper end of the piston holder 21, and the piston 22 is movably arranged in the air cylinder cavity 101 in the cylinder sleeve 12 to define a compression chamber in the air cylinder cavity 101, and the compression chamber is communicated with the air inlet hole 141 through the air inlet passage 111.

[0048] The air pump 1001 of the embodiment of the present application is a single-piston air pump, which can also be called a single-stage compression air pump 10011, and the single-stage compression air pump 10011 can provide simpler control and adjustment. The air reservoir 6 is arranged at the exhaust side of the cylinder 1, and the air reservoir 6 can smooth the air flow and improve the operation quality and reliability of the air pump 1001.

[0049] The planetary reduction assembly 3 is arranged at the other side of the cylinder body 11 opposite to the air inlet cover 14, and the planetary reduction assembly 3 is connected with the lower end of the piston holder 21 through the crankshaft 5. The motor 4 has a motor shaft 41 connected with the planetary reduction assembly 3, and the motor 4 drives the piston 22 to move in the air cylinder cavity 101 through the planetary reduction assembly 3 and the crankshaft 5.

[0050] In some examples, as Figures 5-6As shown, the motor 4 includes a motor shaft 41, a motor housing 42, a motor rear end cover 43, a rotor 44, and a stator 45. The rear end of the motor housing 42 has an opening, and the other end of the motor housing 42 has a hole for the motor shaft 41 to pass through, in which a rotor front bearing 46 is installed. The motor rear end cover 43 is detachably mounted to the opening of the motor housing 42 by bolts. The motor rear end cover 43 has a groove in which a rotor rear bearing 47 is installed. The motor shaft 41 is connected to the rotor 44. The portion of the motor shaft 41 that passes through the motor housing 42 mates with the rotor front bearing 46, and the end of the motor shaft 41 located inside the motor housing 42 mates with the rotor rear bearing 47.

[0051] Specifically, such as Figure 5 and Figure 6 As shown, the planetary reduction assembly 3 includes an internal gear ring 31, a planet carrier 32, a sun gear 33, and multiple planet gears 34. The planet gears 34 are rotatably mounted on the planet carrier 32 via planet gear shafts 35. The sun gear 33 is mounted on the motor shaft 41 of the motor 4. The internal gear ring 31 is connected to the motor housing 42 of the motor 4. The planet gears 34 mesh with the sun gear 33 and the internal gear ring 31 respectively. The crankshaft 5 is connected to the planet carrier 32.

[0052] The internal gear ring 31 is constructed as the fixed gear of the planetary reduction assembly 3. The internal gear ring 31 includes a cylindrical body 311 and an annular boss 312. The annular boss 312 is provided on the inner peripheral wall of the cylindrical body 311, and internal teeth are formed on the inner peripheral wall surface of the annular boss 312. The annular boss 312 defines a mating hole 301 in the cylindrical body 311. The mating hole 301 is located at the end of the cylindrical body 311 near the motor 4. The end of the motor housing 42 is provided with a mating part 401 with a reduced diameter. The mating part 401 fits into the mating hole 301. One end of the cylindrical body 311 is connected to one end of the motor housing 42, and the outer peripheral surface of the cylindrical body 311 is flush with the outer peripheral surface of the motor housing 42.

[0053] The tight fit between the mating hole 301 and the mating part 401 reduces the distance between the planetary reduction gear assembly 3 and the motor 4, improving structural compactness, reducing volume and space occupation, thereby further reducing the volume of the air pump 1001. Furthermore, the outer circumferential surface of the cylinder 311 is flush with the outer circumferential surface of the motor housing 42, improving the overall visual effect. Moreover, a sealing ring 48 or other sealing elements can be provided between the mating hole 301 and the mating part 401 to improve the sealing performance between the planetary reduction gear assembly 3 and the motor 4.

[0054] like Figure 6 As shown, the end face of the planetary carrier 32 furthest from the crankshaft 5 ( Figure 6 The right end face of the motor shaft 41 is provided with an assembly groove 321, and a rear bearing 322 is installed in the assembly groove 321. One end of the motor shaft 41 that extends out of the motor housing 42 is engaged with the rear bearing 322.

[0055] The motor shaft 41 drives the sun gear 33 to rotate around the center axis X1 which is the center axis of the motor shaft 41, the sun gear 33 and the planet carrier 32, and the planet gear 34 rotates around the center axis X1 while revolving around the center axis of the planet gear shaft 35, so that the planet carrier 32 rotates around the center axis X1.

[0056] Preferably, the inner ring gear 31 and the planet gear 34 are provided with helical teeth, and the tooth profile of the helical teeth is designed to gradually enter and exit the engagement when the gears are engaged, so as to reduce the impact and noise and improve the stability of the engagement. In addition, the engagement area of the helical teeth is uniformly distributed on the tooth surface, reducing the wear of the tooth surface and prolonging the service life of the gear.

[0057] As shown in Figures 5-7 The crankshaft 5 includes a main shaft part 51 and an eccentric shaft part 52, one end of the main shaft part 51 is connected to the planet carrier 32, and the center axis of the main shaft part 51 is coaxial with the center axis X1 of the planet carrier 32, the inner ring gear 31 and the motor shaft 41, which is referred to as the center axis X1 in the following description. The cylinder block 11 is provided with a front bearing 112, and the main shaft part 51 cooperates with the front bearing 112.

[0058] Preferably, the main shaft part 51 and the planet carrier 32 can be formed integrally, thereby improving the overall strength and durability of the crankshaft 5, reducing the workload of assembling and maintaining the crankshaft 5, improving the structural compactness, reducing the volume and occupied space, and further reducing the volume of the air pump 1001.

[0059] The main shaft part 51 is provided with an assembly hole 511, one end of the eccentric shaft part 52 is fitted in the assembly hole 511, the other end of the eccentric shaft part 52 extends out of the assembly hole 511, and the center axis X2 of the eccentric shaft part 52 is eccentric relative to the center axis X1 of the main shaft part 51. The piston carrier 21 is provided with a mounting groove 211 at the lower end of the piston carrier 21, and a piston bearing 212 is mounted in the mounting groove 211, and the other end of the eccentric shaft part 52 cooperates with the piston bearing 212.

[0060] Since the piston assembly 2 and the eccentric shaft part 52 are arranged eccentrically relative to the main shaft part 51, the crankshaft 5 will generate unbalanced force when rotating, therefore, the main shaft part 51 is provided with a balance weight 53 for reducing or eliminating the vibration caused by the unbalance of the crankshaft 5, improving the stability and reliability of the operation of the crankshaft 5, and reducing the noise generated by the vibration of the crankshaft 5.

[0061] The single-stage compression air pump 10011 of the embodiment of the utility model, the motor 4 drives the sun gear 33 to rotate around the central axis X1, the planet wheel 34 engaged with the sun gear 33 and the inner gear ring 31 revolves around the central axis X1 while rotating around the central axis of the planet wheel shaft 35, thereby driving the planet carrier 32 and the main shaft part 51 of the crankshaft 5 to rotate around the central axis X1, the eccentric shaft part 52 revolves around the central axis X1, thereby driving the piston 22 to reciprocate in the cylinder cavity 101 to compress the gas entering the compression chamber through the intake hole 141 and the intake passage 111, and the compressed gas is discharged through the exhaust valve 15, for example, through the exhaust passage in the cylinder cover 13 to the air reservoir 6.

[0062] The single-stage compression air pump 10011 of the embodiment of the utility model, the motor 4 drives the piston 22 through the planetary reduction assembly 3 and the crankshaft 5, the inner gear ring 31 of the planetary reduction assembly 3 and the motor shell 42 can be connected as a whole, and the crankshaft 5 and the planet carrier 32 can be connected as a whole, therefore, the air pump 1001 is more compact in structure, small in size, small in required space, high in transmission efficiency, the motor 4 can use a high-speed motor, and the air pump 1001 is particularly suitable for occasions with small installation space, for example, used in a vehicle air pump.

[0063] The air pump of other specific embodiments of the utility model will be described below in combination with the drawings.

[0064] As shown in Figures 3-7 , the air pump 1001 of other specific embodiments of the utility model comprises a cylinder 1, a piston assembly 2, a planetary reduction assembly 3, a motor 4 and a dryer 7.

[0065] As shown in Figure 3 and Figure 4 , the cylinder 1 comprises a cylinder body 11, a cylinder cover 13 and an exhaust valve 15. The cylinder cover 13 is installed at the lower end of the cylinder body 11 and is detachably connected with the cylinder body 11, for example, through bolts. The cylinder body 11 has a cylinder cavity 101 therein, the cylinder cavity 101 comprises a first cylinder cavity 1011 and a second cylinder cavity 1012, the side wall of the cylinder body 11 has an air inlet 113 and an air outlet 114, the cylinder body 11 has an intake passage 111 communicating with the air inlet 113, and the exhaust valve 15 is arranged at the air outlet 114.

[0066] The piston assembly 2 comprises a piston frame 21 and two pistons 22, i.e., a first piston 221 and a second piston 222, the first piston 221 being arranged at the lower end of the piston frame 21, the first piston 221 being movably fitted in the first cylinder cavity 1011 and defining a first compression chamber 1021 in the first cylinder cavity 1011, the second piston 222 being arranged at the upper end of the piston frame 21, the second piston 222 being movably fitted in the second cylinder cavity 1012 and defining a second compression chamber 1022 in the second cylinder cavity 1012, the first compression chamber 1021 and the second compression chamber 1022 being communicated through a communication passage 201.

[0067] The first piston 221 is larger than the second piston 222, the pressure in the first compression chamber 1021 is lower than the pressure in the second compression chamber 1022, and the communication passage 201 can be formed in the cylinder 1 or in the piston assembly 2 or by a separate bypass pipe. Figure 4 The communication passage 201 is formed in the piston assembly 2, i.e., through the first piston 221, the piston frame 21 and the second piston 222, avoiding the problem of complex structure of the cylinder 1 caused by forming the communication passage 201 in the cylinder 1, and the problem of increase in the overall volume of the cylinder 1 caused by separately arranging the bypass pipe.

[0068] The air pump 1001 of the embodiment of the utility model is a double-piston air pump, which can also be referred to as a two-stage compression air pump 10012, and the two-stage compression air pump 10012 has higher compression efficiency and better applicability than the single-stage compression air pump 10011.

[0069] The first piston 221 reciprocates in the first cylinder cavity 1011, and the second piston 222 reciprocates in the second cylinder cavity 1012, so as to alternately compress air through the two pistons 22, thereby improving the compression efficiency.

[0070] In addition, the two-stage compression air pump 10012 has a large compression ratio and a high temperature, and a large amount of water is separated out during cooling, and therefore, a dryer 7 can be arranged at the exhaust side of the cylinder body 11, water is removed by the dryer 7, and then the compressed air after drying is discharged through the air outlet 71.

[0071] The planetary reduction gear 3 is connected to the middle of the piston holder 21 via the crankshaft 5. The motor 4 has a motor shaft 41, which is connected to the planetary reduction gear 3 to drive the piston 22 to move within the cylinder chamber 101 via the planetary reduction gear 3 and the crankshaft 5. The structure and connection of the planetary reduction gear 3, crankshaft 5, and motor 4 of the two-stage compression pump 10012 are the same as those of the single-stage compression pump 10011 described above, and will not be repeated here.

[0072] The motor 4 of the secondary compressed air pump 10012 can be a DC motor with a speed greater than 4000 rpm. During startup, the motor 4 rapidly accelerates to its operating speed, reducing the time it takes for the air pump 1001 to reach its operating state from a standstill. Similarly, the motor 4 can rapidly decelerate to a stop after a stop command is issued, reducing the transition time from the operating state to a standstill. Preferably, the motor 4 has a speed greater than 8000 rpm.

[0073] Therefore, by using a combination of a high-speed motor 4 and a planetary reduction gear 3, the high-speed motor 4 enables the air pump 1001 to respond quickly to load changes, while the planetary reduction gear 3 ensures the stability and accuracy of this response.

[0074] When the two-stage compressed air pump 10012 of this utility model is running, for example, the motor 4 drives the first piston 221 and the second piston 222 to reciprocate in the corresponding first cylinder chamber 1011 and second cylinder chamber 1012 via the piston assembly 2 and the crankshaft 5. For example, the first piston 221 and the second piston 222 reciprocate in... Figure 4 Moving downwards, the first piston 221 compresses the gas entering the first compression chamber 1021 through the air inlet 113 and the air inlet passage 111. The compressed gas in the first compression chamber 1021 enters the second compression chamber 1022 through the connecting air passage 201. Then, the first piston 221 and the second piston 222 move downwards. Figure 4 As the valve moves upward, the valve plate 8 closes the air passage 201, disconnecting the first compression chamber 1021 and the second compression chamber 1022. The second piston 222 compresses the gas entering the second compression chamber 1022 from the first compression chamber 1021. The gas compressed in the second compression chamber 1022 is discharged into the dryer 7 through the exhaust valve 15 in the exhaust port 114, and after drying, it is discharged from the air pump 1001 through the air outlet 71.

[0075] The vehicle of this utility model embodiment is described below with reference to the accompanying drawings.

[0076] like Figure 8As shown, the vehicle 100 of the embodiment of the present application comprises the pneumatic device 1002 and the air pump, the air pump is connected with the pneumatic device 1002, and is used for supplying compressed air to the pneumatic device 1002; the air pump can be the air pump 1001 of the above embodiment.

[0077] Therefore, the vehicle 100 of the embodiment of the present application has the compact structure, small volume, light weight, miniaturization and high applicability, thereby effectively solving the problems of large volume and slow starting response of the air pump for vehicle in the related art, and the air pump 1001 of the embodiment of the present application can provide a more efficient, compact and reliable air supply scheme for the air suspension system of the vehicle 100.

[0078] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0079] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0080] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0082] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0083] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An air pump, characterized in that, include: A cylinder, wherein the cylinder has a cylinder chamber; A piston assembly, the piston assembly including a piston holder and a piston, the piston being disposed at at least one end of the piston holder and movably disposed within the cylinder chamber; A planetary reduction gear assembly, wherein the planetary reduction gear assembly is connected to the piston carrier via a crankshaft; An electric motor having a motor shaft connected to the planetary reduction gear assembly to drive the piston to move within the cylinder chamber via the planetary reduction gear assembly and the crankshaft.

2. The air pump according to claim 1, characterized in that, The planetary reduction gear assembly includes an internal gear ring, a planet carrier, a sun gear, and multiple planet gears. The planet gears are rotatably mounted on the planet carrier via planet gear shafts. The sun gear is mounted on the motor shaft. The internal gear ring is connected to the motor housing of the motor. The planet gears mesh with the sun gear and the internal gear ring, respectively. The crankshaft includes a main shaft portion and an eccentric shaft portion. The main shaft portion is connected to the planet carrier. The central axis of the main shaft portion is coaxial with the central axis of the planet carrier, the central axis of the internal gear ring, and the central axis of the motor shaft. The eccentric shaft portion is connected to the main shaft portion. The central axis of the eccentric shaft portion is eccentric relative to the central axis of the main shaft portion. The eccentric shaft portion is connected to the piston carrier.

3. The air pump according to claim 2, characterized in that, The main spindle is provided with a balance block, the planetary carrier is integrally formed with the main spindle, the main spindle is provided with an assembly hole, the eccentric shaft is fitted into the assembly hole and one end of the eccentric shaft extends out of the assembly hole.

4. The air pump according to claim 2, characterized in that, The internal gear ring includes a cylindrical body and an annular boss. The annular boss is disposed on the inner peripheral wall of the cylindrical body and defines a mating hole at one end of the cylindrical body. Internal teeth are formed on the inner peripheral wall surface of the annular boss. The end of the motor housing is provided with a mating part with a reduced diameter. The mating part fits into the mating hole. One end of the cylindrical body is connected to one end of the motor housing, and the outer peripheral surface of the cylindrical body is flush with the outer peripheral surface of the motor housing.

5. The air pump according to claim 2, characterized in that, The piston holder is provided with a mounting groove, and a piston bearing is installed in the mounting groove. One end of the eccentric shaft is engaged with the piston bearing.

6. The air pump according to claim 1, characterized in that, The cylinder chamber is a single cylinder, the piston is a single piston located at the first end of the piston holder, and the planetary reduction gear assembly is connected to the second end of the piston holder via the crankshaft.

7. The air pump according to claim 1, characterized in that, The cylinder chamber includes a first cylinder chamber and a second cylinder chamber. The piston assembly includes a first piston and a second piston. The first piston is disposed at a first end of the piston holder. The first piston is movably fitted within the first cylinder chamber and defines a first compression chamber within the first cylinder chamber. The second piston is located at the second end of the piston holder. The second piston is movably fitted within the second cylinder chamber and defines a second compression chamber within the second cylinder chamber. The first compression chamber and the second compression chamber are connected through a connecting air passage. The planetary reduction gear assembly is connected to the middle of the piston holder via the crankshaft. The first piston is larger than the second piston, the pressure in the first compression chamber is lower than the pressure in the second compression chamber, and the connecting air passage is formed in the cylinder, or in the piston assembly, or by a separate bypass pipe.

8. The air pump according to claim 7, characterized in that, The motor is a DC motor, and the motor speed is greater than 4000 rpm.

9. The air pump according to claim 8, characterized in that, The motor has a speed greater than 8000 rpm.

10. A vehicle, characterized in that, include: A pneumatic device and an air pump according to any one of claims 1-9, wherein the air pump is connected to the pneumatic device for supplying compressed air to the pneumatic device.

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