Air compressor, air suspension system and vehicle

Abstract

The utility model discloses an air compressor, an air suspension system and a vehicle, the air compressor comprises a driving part, the driving part comprises a motor, and a motor shaft of the motor is provided with an eccentric part which is eccentrically arranged with the motor shaft; the air cylinder assembly comprises a first-stage compression cavity and a second-stage compression cavity; the eccentric part drives the first piston assembly to reciprocate in the second-stage compression cavity, and the first piston assembly is provided with a connecting hole; the piston pin is partially located in the connecting hole so as to be in running fit with the first piston assembly, a rolling bearing is arranged in the connecting hole, the piston pin is sleeved with the rolling bearing, and the rolling bearing is in interference fit with the piston pin; and the piston pin drives the second piston assembly to do reciprocating motion in the first-stage compression cavity. According to the air compressor provided by the utility model, the rolling bearing is in interference fit with the piston pin, so that noise generated by collision between the piston pin and the rolling bearing is avoided, and the noise problem during operation of the air compressor is effectively improved.

Description

Technical Field

[0001] This application relates to the field of compressors, and more particularly to an air compressor, an air suspension system, and a vehicle. Background Technology

[0002] In related technologies, the compressor of an air suspension system typically includes a drive assembly, a high-pressure piston assembly, a low-pressure piston assembly, and a cylinder. The cylinder includes a primary compression chamber and a secondary compression chamber. When the compressor is working, the drive assembly drives the low-pressure piston assembly to reciprocate in the primary compression chamber to compress the gas, and drives the high-pressure piston assembly to reciprocate in the secondary compression chamber to compress the gas, thereby achieving two compressions of the gas.

[0003] The compressor in the above technical solution has the problem of high operating noise. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an air compressor in which the rolling bearing and piston pin are interference-fitted, avoiding noise caused by collision between the piston pin and the rolling bearing, and effectively improving the noise problem during air compressor operation.

[0005] This application also proposes an air suspension system that includes the aforementioned air compressor.

[0006] This application also proposes a vehicle that includes the aforementioned air suspension system.

[0007] An air compressor according to an embodiment of the present invention includes: a drive unit, the drive unit including a housing and a motor disposed within the housing, the motor shaft of the motor having an eccentric portion disposed eccentrically thereto; a cylinder assembly, the cylinder being disposed on a connecting rod of the housing, the cylinder assembly including a primary compression chamber and a secondary compression chamber; a first piston assembly, the first piston assembly being connected to the eccentric portion to reciprocate within the secondary compression chamber, the first piston assembly having a connecting hole; a piston pin, a portion of the piston pin being located within the connecting hole to rotatably engage with the first piston assembly, a rolling bearing being disposed within the connecting hole, the rolling bearing being sleeved on the piston pin, the rolling bearing being interference-fitted with the piston pin; and a second piston assembly, the second piston assembly including a first connecting rod and a second connecting rod spaced apart, at least a portion of the first piston assembly being located between the first connecting rod and the second connecting rod, the piston pin passing through the first connecting rod, the first piston assembly, and the second connecting rod, the second piston assembly reciprocating within the primary compression chamber under the drive of the piston pin.

[0008] According to the embodiment of the present invention, the air compressor reduces the friction coefficient between the piston pin and the first piston assembly by setting a rolling bearing between the piston pin and the first piston assembly, thereby improving the smoothness of the rotation of the first piston assembly relative to the piston pin and reducing frictional losses during the operation of the air compressor. In addition, the interference fit between the rolling bearing and the piston pin avoids noise caused by collision between the piston pin and the rolling bearing, effectively improving the noise problem during the operation of the air compressor.

[0009] In some embodiments, the engagement force between the rolling bearing and the piston pin is F, and the piston assembly satisfies: 5N≤F≤300N, wherein the engagement force is the maximum force that the piston pin needs to overcome to move relative to the rolling bearing in the axial direction of the piston pin.

[0010] In some embodiments, the piston pin is interference-fitted with the first connecting rod and the second connecting rod, respectively.

[0011] In some embodiments, the interference fit between the piston pin and the first connecting rod is Y1, the interference fit between the piston pin and the second connecting rod is Y2, and the piston assembly satisfies: Y1 < Y2.

[0012] In some embodiments, the piston assembly further satisfies: 1 < Y2 / Y1 ≤ 3.

[0013] In some embodiments, in the axial direction of the piston pin, the first piston assembly has a gap between itself and the first connecting rod and the second connecting rod, respectively.

[0014] In some embodiments, a spacer is provided in the gap on at least one side, the spacer contacting the first piston assembly and the second piston assembly respectively, the spacer including at least one of a lubricating layer and a mating bearing.

[0015] In some embodiments, the spacer is configured as an annular structure that fits over the piston pin; or, the spacer is configured as an arcuate structure disposed around the piston pin.

[0016] An air suspension system according to an embodiment of the present invention includes: the air compressor described in the above technical solution.

[0017] The vehicle according to an embodiment of the present invention includes: the air suspension system described in the above technical solution; and / or the air compressor described in the above technical solution.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram showing the cooperation of the first piston assembly, piston pin, and second piston assembly according to an embodiment of the present utility model;

[0021] Figure 2 The explosion of the first piston assembly, piston pin, and second piston assembly according to an embodiment of the present invention. Figure 1 ;

[0022] Figure 3 This is a cross-sectional view of the first piston assembly, piston pin, and second piston assembly according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of a piston pin;

[0024] Figure 5 The explosion of the first piston assembly, piston pin, and second piston assembly according to an embodiment of the present invention. Figure 2 ;

[0025] Figure 6 The explosion of the first piston assembly, piston pin, and second piston assembly according to an embodiment of the present invention. Figure 3 ;

[0026] Figure 7 This is a schematic diagram of the first piston assembly;

[0027] Figure 8 This is a schematic diagram of the mating bearing;

[0028] Figure 9 This is a schematic diagram of an air compressor according to an embodiment of the present utility model;

[0029] Figure 10 This is a comparison diagram of the noise levels of the air compressor in this application embodiment and air compressors in related technologies.

[0030] Reference numerals: 100, air compressor; 1, first piston assembly; 11, connecting hole; 12, rolling bearing; 13, mating part; 14, limiting member; 2, second piston assembly; 21, first connecting rod; 22, second connecting rod; 3, piston pin; 31, guide surface; 4, spacer; 41, lubricating layer; 42, mating bearing; 5, cylinder assembly; 51, secondary compression chamber; 6, drive unit; 61, eccentric part. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following is for reference. Figures 1-10 An air compressor 100 according to an embodiment of the present invention is described.

[0035] Reference Figure 1 , Figure 2 and Figure 9 An air compressor 100 according to an embodiment of the present invention includes: a drive unit 6, a cylinder assembly 5, a first piston assembly 1, and a second piston assembly 2; the drive unit 6 is used to drive the first piston assembly 1 and the second piston assembly 2 to move relative to the cylinder assembly 5 to compress the gas entering the cylinder assembly 5.

[0036] The drive unit 6 includes a housing and a motor disposed within the housing. The motor shaft of the motor has an eccentric part 61 that is eccentrically disposed therewith. The drive unit 6 can drive the motor shaft to rotate via the motor. When the motor shaft rotates, it causes the eccentric part 61 to rotate eccentrically relative to the axis of the motor shaft.

[0037] The cylinder assembly 5 is located at one end of the housing. The cylinder assembly 5 includes a primary compression chamber and a secondary compression chamber 51. The mating part 13 of the first piston assembly 1 is connected to the eccentric part 61 so that the first piston assembly 1 reciprocates in the secondary compression chamber 51. The first piston assembly 1 and the second piston assembly 2 cooperate to drive the second piston assembly 2 to reciprocate in the primary compression chamber.

[0038] When the second piston assembly 2 reciprocates within the primary compression chamber, it compresses the gas within the primary compression chamber. The primary compression chamber is provided with an air passage communicating with the secondary compression chamber 51, allowing the compressed gas in the primary compression chamber to enter the secondary compression chamber 51 through the air passage. When the first piston assembly 1 reciprocates within the secondary compression chamber 51, it compresses the gas within the secondary compression chamber 51, thereby enabling the air compressor 100 in this embodiment of the invention to compress the gas at least twice, improving the compression effect of the air compressor 100.

[0039] Specifically, refer to Figure 1 , Figure 2 and Figure 3 The first piston assembly 1 and the second piston assembly 2 are connected by a piston pin 3. The first piston assembly 1 is provided with a connecting hole 11. Part of the piston pin 3 is located in the connecting hole 11 to rotate with the first piston assembly 1. A rolling bearing 12 is provided in the connecting hole 11. The rolling bearing 12 is sleeved on the piston pin 3 and is interference-fitted with the piston pin 3.

[0040] The second piston assembly 2 includes a first connecting rod 21 and a second connecting rod 22 spaced apart. At least a portion of the first piston assembly 1 is located between the first connecting rod 21 and the second connecting rod 22. The piston pin 3 passes through the first connecting rod 21, the first piston assembly 1, and the second connecting rod 22, thereby causing the second piston assembly 2 to reciprocate within the primary compression chamber under the drive of the piston pin 3.

[0041] Through the above technical solution, the second piston assembly 2 is connected to the piston pin 3 through the first connecting rod 21 and the second connecting rod 22, and the first connecting rod 21 and the second connecting rod 22 are located on both sides of the first piston assembly 1, which effectively improves the reliability of the connection between the first piston assembly 1 and the second piston assembly 2.

[0042] According to the embodiment of the present invention, the air compressor 100 reduces the friction coefficient between the piston pin 3 and the first piston assembly 1 by providing a rolling bearing 12 between the piston pin 3 and the first piston assembly 1, thereby improving the smoothness of the rotation of the first piston assembly 1 relative to the piston pin 3 and reducing the friction loss during the operation of the air compressor 100. In addition, the rolling bearing 12 is interference-fitted with the piston pin 3, which avoids noise caused by collision between the piston pin 3 and the rolling bearing 12, effectively improving the noise problem during the operation of the air compressor 100.

[0043] In some further embodiments, the engagement force between the rolling bearing 12 and the piston pin 3 is F, and the air compressor 100 satisfies: 5N≤F≤300N, where the engagement force F is the maximum force that the piston pin 3 needs to overcome to move relative to the rolling bearing 12 in the axial direction of the piston pin 3.

[0044] If the fitting force F between the rolling bearing 12 and the piston pin 3 is greater than 300N, it will result in an excessive interference fit between the piston pin 3 and the rolling bearing 12, affecting the rotation of the rolling bearing 12, easily increasing the friction between the piston pin 3 and the first piston assembly 1, increasing the friction loss of the air compressor 100, and affecting the service life of the air compressor 100. If the fitting force F between the rolling bearing 12 and the piston pin 3 is less than 5N, it will cause the first piston assembly 1 to easily move relative to the piston pin 3 when the air compressor 100 is running, colliding with the first connecting rod 21 or the second connecting rod 22, resulting in friction and noise.

[0045] In this embodiment, the range of the engagement force F between the rolling bearing 12 and the piston pin 3 is limited. This not only prevents collisions between the piston pin 3 and the rolling bearing 12, but also prevents excessive interference between the piston pin 3 and the rolling bearing 12, which would affect the rotation of the rolling bearing 12. This ensures the smooth movement of the first piston assembly 1 and reduces the possibility of collisions between the first piston assembly 1 and the first connecting rod 21 and the second connecting rod 22, further reducing the noise during the operation of the air compressor 100.

[0046] Reference Figure 10 It is known that the noise level of the air compressor 100 in the related technology is poor. In this embodiment, after the piston pin 3 and the rolling bearing 12 are interference-fitted, the noise level of the air compressor 100 is effectively improved, so that the noise level of the air compressor 100 during operation can meet the requirements. Moreover, after testing, the technical solution of "interference fit between piston pin 3 and rolling bearing 12" can be applied to different samples of air compressor 100, and the noise level of the air compressor 100 of each sample can be improved.

[0047] Method for testing the fit force F between rolling bearing 12 and piston pin 3: Place the first piston assembly 1, which is equipped with rolling bearing 12 and piston pin 3, on a pressure testing machine, fix one of piston pin 3 and the first piston assembly 1, and apply an axial force to the other of piston pin 3 and the first piston assembly 1. The force increases continuously from 0. When piston pin 3 and the first piston assembly 1 move relative to each other, the force value on the pressure testing machine is the value of the fit force F between rolling bearing 12 and piston pin 3.

[0048] In some specific embodiments, the engagement force F between the rolling bearing 12 and the piston pin 3 is any one of 5N, 10N, 30N, 100N, or 300N, or a range between any two.

[0049] In some further embodiments, the rolling bearing 12 is constructed as a needle roller bearing, which reduces the radial dimension of the rolling bearing 12 in the piston pin 3, thus facilitating the overall miniaturization of the air compressor 100.

[0050] In some further embodiments, the piston pin 3 is interference-fitted with the first connecting rod 21 and the second connecting rod 22, respectively.

[0051] The above technical solution restricts the relative movement between the piston pin 3 and the first connecting rod 21, and also restricts the relative movement between the piston pin 3 and the second connecting rod 22. That is, it restricts the relative movement between the first piston assembly 1, the first connecting rod 21, and the second connecting rod 22, thereby avoiding the possibility of collision and friction between the first piston assembly 1 and the first connecting rod 21, reducing the frictional loss of the air compressor 100, and improving the noise level of the air compressor 100.

[0052] In some specific embodiments, the interference fit between the piston pin 3 and the first connecting rod 21 is Y1, and the interference fit between the piston pin 3 and the second connecting rod 22 is Y2. The air compressor 100 satisfies the condition that Y1 < Y2.

[0053] During the assembly of the air compressor 100, the piston pin 3 first passes through the first connecting rod 21, then through the rolling bearing 12, and finally through the second connecting rod 22. In this embodiment, the interference fit Y1 between the piston pin 3 and the first connecting rod 21 is less than the interference fit Y2 between the piston pin 3 and the second connecting rod 22. This effectively improves the ease of assembly of the air compressor 100, reduces the risk of wear when the piston pin 3 moves relative to the first connecting rod 21 after passing through it, reduces the possibility of particulate contamination of the rolling bearing 12 due to friction between the piston pin 3 and the first connecting rod 21, and also reduces the risk of deformation of the first connecting rod 21.

[0054] In some further embodiments, the air compressor 100 further satisfies: 1 < Y2 / Y1 ≤ 3.

[0055] If Y2 / Y1 is greater than 3, the interference fit Y1 between the piston pin 3 and the first connecting rod 21 will be too small, making it easy for relative movement to occur between the piston pin 3 and the first connecting rod 21, affecting the relative movement between the first piston assembly 1 and the second piston assembly 2. In this embodiment, Y2 / Y1 is limited to no more than 3, ensuring the reliability of the rotational fit between the first piston assembly 1 and the second piston assembly 2.

[0056] In some embodiments, in the axial direction of the piston pin 3, the first piston assembly 1 is provided with a gap between the first connecting rod 21 and the second connecting rod 22 respectively.

[0057] The above technical solution further reduces the possibility of collision and friction between the first piston assembly 1 and the first connecting rod 21, as well as between the first piston assembly 1 and the second connecting rod 22, thereby reducing the frictional loss of the air compressor 100 and improving the noise level of the air compressor 100.

[0058] In some further embodiments, the distance between the first piston assembly 1 and the first connecting rod 21 is equal to the distance between the first piston assembly 1 and the second connecting rod 22. This further reduces the possibility of the first piston assembly 1 colliding or rubbing against the first connecting rod 21 or the second connecting rod 22.

[0059] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, at least one of the two ends of the piston pin 3 is provided with a guide surface 31 in the axial direction of the piston pin 3. The guide surface 31 is adapted to cooperate with the through hole on the first connecting rod 21, the rolling bearing 12 and the through hole on the second connecting rod 22, so that the piston pin 3 can pass through the first connecting rod 21, the rolling bearing 12 and the second connecting rod 22.

[0060] Reference Figure 5 and Figure 6 In some embodiments, a gap is provided between the first piston assembly 1 and the first connecting rod 21 and the second connecting rod 22 in the axial direction of the piston pin 3. A spacer 4 is provided on at least one side of the gap, and the spacer 4 contacts the first piston assembly 1 and the second piston assembly 2 respectively. The spacer 4 includes at least one of a lubricating layer 41 and a mating bearing 42.

[0061] The first piston assembly 1 and the second piston assembly 2 are separated by the spacer 4 to avoid direct contact between the first piston assembly 1 and the second piston assembly 2, thereby avoiding friction between the first piston assembly 1 and the second piston assembly 2 and preventing the generation of particles due to friction between the first piston assembly 1 and the second piston assembly 2, which helps to extend the product life of the air compressor 100.

[0062] For example, refer to Figure 5 The spacer 4 includes a lubricating layer 41, which is configured to have good lubricity. By providing the lubricating layer 41 between the first piston assembly 1 and the second piston assembly 2, the coefficient of friction between the first piston assembly 1 and the second piston assembly 2 is reduced, frictional losses during compressor operation are reduced, the possibility of particles being generated by friction between the first piston assembly 1 and the second piston assembly 2 is avoided, the reliability of the compressor is improved, and the product life of the compressor is extended.

[0063] For example, refer to Figure 6 The spacer 4 includes a mating bearing 42. By setting the mating bearing 42 between the first piston assembly 1 and the second piston assembly 2, the sliding friction between the first piston assembly 1 and the second piston assembly 2 can be converted into rolling friction, effectively reducing the friction coefficient between the first piston assembly 1 and the second piston assembly 2, reducing friction loss during compressor operation, avoiding the possibility of generating particles due to friction between the first piston assembly 1 and the second piston assembly 2, improving the reliability of compressor use, and helping to extend the product life of the compressor.

[0064] In some embodiments, the spacer 4 includes a lubricating layer 41, which is a coating applied to the first piston assembly 1.

[0065] In this embodiment of the present invention, the lubrication layer 41 is constructed as a coating, which occupies little space, making the overall structure of the air compressor 100 more compact, which is conducive to the miniaturization of the compressor as a whole. Furthermore, the coating only needs to be applied to the first piston assembly 1, making installation convenient and reducing the cost of the air compressor 100.

[0066] In other embodiments, the spacer 4 includes a lubricating layer 41, which is a coating applied to the second piston assembly 2.

[0067] In this embodiment of the present invention, the lubrication layer 41 is constructed as a coating, which occupies little space, making the overall structure of the air compressor 100 more compact, which is conducive to the miniaturization of the compressor as a whole. Furthermore, the coating only needs to be applied to the second piston assembly 2, making installation convenient and reducing the cost of the air compressor 100.

[0068] In some other embodiments, a lubricating coating is provided on the side of the first piston assembly 1 facing the second piston assembly 2, and a lubricating coating is also provided on the side of the second piston assembly 2 facing the first piston assembly 1.

[0069] In some embodiments, the lubricating layer 41 is a PTFE (Polytetrafluoroethylene) coating.

[0070] In this embodiment of the present invention, a PTFE coating is provided between the first piston assembly 1 and the second piston assembly 2. The PTFE coating has an extremely smooth surface and a very low coefficient of friction, and has good lubricity, which helps to reduce friction and wear, effectively reducing frictional losses during compressor operation, avoiding the possibility of particles being generated by friction between the first piston assembly 1 and the second piston assembly 2, and improving the reliability of the compressor.

[0071] In some embodiments, the lubricating layer 41 is a graphite coating.

[0072] In this embodiment of the invention, a graphite coating is provided between the first piston assembly 1 and the second piston assembly 2. The graphite coating has high-temperature stability and lubricity. The graphite coating maintains stable physical and chemical properties at high temperatures, and its layered structure provides excellent lubricity, helping to reduce friction and wear. This effectively reduces frictional losses during compressor operation, avoids the possibility of particle generation due to friction between the first piston assembly 1 and the second piston assembly 2, and improves the reliability of the compressor.

[0073] The PTFE coating and graphite coating in the above technical solution are both solid lubricants. It should be understood that the lubrication layer 41 can also be a coating of other lubricant materials, and this utility model does not limit this.

[0074] Reference Figure 6 and Figure 7 In some embodiments, the spacer 4 includes a mating bearing 42, which is a ball bearing for rolling contact with the first piston assembly 1 and the second piston assembly 2, respectively.

[0075] In this embodiment of the invention, the sliding friction between the first piston assembly 1 and the second piston assembly 2 can be transformed into rolling friction through the balls of the ball bearing. This effectively reduces the coefficient of friction between the first piston assembly 1 and the second piston assembly 2, reduces frictional losses during compressor operation, avoids the possibility of particles being generated by friction between the first piston assembly 1 and the second piston assembly 2, improves the reliability of the compressor, and helps extend the product life of the compressor.

[0076] Reference Figure 8 In some embodiments, the spacer 4 is configured as an annular structure that fits over the piston pin 3.

[0077] In this embodiment of the present invention, the spacer 4 is a ring-shaped structure that can be directly fitted onto the protruding structure of the first piston assembly 1 or the second piston assembly 2, which facilitates the installation of the spacer 4.

[0078] In some embodiments, the spacer 4 is constructed as an annular ball bearing; in other embodiments, the spacer 4 is an annular coating surrounding the piston pin 3.

[0079] Reference Figure 6 and Figure 7 In some embodiments, the spacer 4 is constructed as an arc-shaped structure disposed on the periphery of the piston pin 3. The arc-shaped spacer 4 not only satisfies the effect of reducing the friction coefficient between the first piston assembly 1 and the second piston assembly 2, but also saves the material of the spacer 4, which is beneficial to reducing the cost of the air compressor 100.

[0080] In some embodiments, the spacer 4 is constructed as an arc-shaped ball bearing; in other embodiments, the spacer 4 is an arc-shaped coating disposed on the piston pin 3 and the bearing 42.

[0081] Reference Figure 6 and Figure 7 In some embodiments, the spacer 4 is configured as an elongated structure disposed on the periphery of the piston pin 3, and the first piston assembly 1 and / or the second piston assembly 2 are provided with a limiting member 14, which abuts against the spacer 4 to restrict the movement of the spacer 4.

[0082] In this embodiment of the utility model, the movement of the spacer 4 is restricted by the limiting member 14, thereby improving the reliability of the use of the spacer 4.

[0083] In some specific embodiments, the first piston assembly 1 is provided with a limiting member 14, and the spacer 4 is disposed on the first piston assembly 1, and the spacer 4 abuts against the limiting member 14 on the first piston assembly 1, thereby stably installing the spacer 4 on the first piston assembly 1 and ensuring the reliability of the use of the spacer 4.

[0084] In some further embodiments, at least two limiting members 14 are provided, and each end of the spacer 4 abuts against at least one limiting member 14.

[0085] The above technical solution further improves the stability of the installation of spacer 4.

[0086] Reference Figure 6 and Figure 7 In some embodiments, the second piston assembly 2 includes a first connecting rod 21 and a second connecting rod 22 spaced apart, the first piston assembly 1 is at least partially located between the first connecting rod 21 and the second connecting rod 22, and the piston pin 3 passes through the first connecting rod 21, the first piston assembly 1 and the second connecting rod 22.

[0087] The spacer 4 is disposed between the first connecting rod 21 and the first piston assembly 1.

[0088] In this embodiment of the present invention, the spacer 4 is disposed between the first connecting rod 21 and the first piston assembly 1 to avoid direct contact between the first piston assembly 1 and the first connecting rod 21, thereby avoiding friction between the first piston assembly 1 and the first connecting rod 21, reducing the coefficient of friction between the first piston assembly 1 and the first connecting rod 21, and preventing the generation of particles due to friction between the first piston assembly 1 and the first connecting rod 21, which is beneficial to extending the product life of the compressor.

[0089] In other embodiments, the spacer 4 is disposed between the second link 22 and the first piston assembly 1.

[0090] In this embodiment of the present invention, the spacer 4 is disposed between the second connecting rod 22 and the first piston assembly 1 to avoid direct contact between the first piston assembly 1 and the second connecting rod 22, thereby avoiding friction between the first piston assembly 1 and the second connecting rod 22, reducing the coefficient of friction between the first piston assembly 1 and the second connecting rod 22, and preventing the generation of particles due to friction between the first piston assembly 1 and the second connecting rod 22, which is beneficial to extending the product life of the compressor.

[0091] In some other embodiments, a spacer 4 is provided between the first connecting rod 21 and the first piston assembly 1, and a spacer 4 is also provided between the second connecting rod 22 and the first piston assembly 1.

[0092] By employing the above technical solution, direct contact between the first piston assembly 1 and the first connecting rod 21 is avoided, thereby preventing friction between the first piston assembly 1 and the first connecting rod 21. Furthermore, direct contact between the first piston assembly 1 and the second connecting rod 22 is also avoided, thus preventing friction between the first piston assembly 1 and the second connecting rod 22. This prevents the generation of particles due to friction between the first piston assembly 1 and the second piston assembly 2, ensuring the reliability of the fit between the first piston assembly 1 and the secondary compression chamber 51, and the reliability of the fit between the second piston assembly 2 and the primary compression chamber, which is beneficial for extending the product life of the compressor.

[0093] Other configurations of the air compressor 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0094] An air suspension system according to an embodiment of the present invention includes: the air compressor 100 described in the above technical solution.

[0095] According to the air suspension system of this utility model embodiment, the air compressor 100 reduces the friction coefficient between the piston pin 3 and the first piston assembly 1 by providing a rolling bearing 12 between the piston pin 3 and the first piston assembly 1, thereby improving the smoothness of the rotation of the first piston assembly 1 relative to the piston pin 3 and reducing the friction loss during the operation of the air compressor 100. In addition, the rolling bearing 12 is interference-fitted with the piston pin 3, avoiding noise generated by the collision between the piston pin 3 and the rolling bearing 12, and effectively improving the noise problem during the operation of the air compressor 100.

[0096] The vehicle according to an embodiment of the present invention includes: the air suspension system described in the above technical solution; and / or the air compressor 100 described in the above technical solution.

[0097] According to the vehicle of the present invention, the air compressor 100 reduces the coefficient of friction between the piston pin 3 and the first piston assembly 1 by providing a rolling bearing 12 between the piston pin 3 and the first piston assembly 1, thereby improving the smoothness of the rotation of the first piston assembly 1 relative to the piston pin 3 and reducing the frictional loss during the operation of the air compressor 100. In addition, the rolling bearing 12 is interference-fitted with the piston pin 3, avoiding noise caused by collision between the piston pin 3 and the rolling bearing 12, and effectively improving the noise problem during the operation of the air compressor 100.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air compressor, characterized in that, include: The drive unit includes a housing and a motor disposed within the housing, wherein the motor shaft of the motor is provided with an eccentric portion that is eccentrically disposed therewith; A cylinder assembly, wherein the cylinder is disposed at one end of the housing, and the cylinder assembly includes a primary compression chamber and a secondary compression chamber; A first piston assembly is connected to the eccentric portion to allow the first piston assembly to reciprocate within the secondary compression chamber, and the first piston assembly is provided with a connection hole. A piston pin, a portion of which is located within the connecting hole to rotatably engage with the first piston assembly, and a rolling bearing is provided within the connecting hole, the rolling bearing being sleeved on the piston pin, the rolling bearing and the piston pin being interference-fitted; The second piston assembly includes a first connecting rod and a second connecting rod spaced apart from each other. At least a portion of the first piston assembly is located between the first connecting rod and the second connecting rod. The piston pin passes through the first connecting rod, the first piston assembly, and the second connecting rod. The second piston assembly reciprocates within the primary compression chamber under the drive of the piston pin.

2. The air compressor according to claim 1, characterized in that, The engagement force between the rolling bearing and the piston pin is F, and the air compressor satisfies: 5N≤F≤300N, wherein the engagement force is the maximum force that the piston pin needs to overcome to move relative to the rolling bearing in the axial direction of the piston pin.

3. The air compressor according to claim 1, characterized in that, The piston pin is interference-fitted with the first connecting rod and the second connecting rod, respectively.

4. The air compressor according to claim 3, characterized in that, The interference fit between the piston pin and the first connecting rod is Y1, and the interference fit between the piston pin and the second connecting rod is Y2. The air compressor satisfies the condition that Y1 < Y2.

5. The air compressor according to claim 4, characterized in that, The air compressor further satisfies: 1 < Y2 / Y1 ≤ 3.

6. The air compressor according to claim 3, characterized in that, In the axial direction of the piston pin, the first piston assembly has gaps between itself and the first connecting rod and the second connecting rod, respectively.

7. The air compressor according to claim 6, characterized in that, A spacer is provided in the gap on at least one side, the spacer contacting the first piston assembly and the second piston assembly respectively, the spacer including at least one of a lubricating layer and a mating bearing.

8. The air compressor according to claim 7, characterized in that, The spacer is constructed as a ring-shaped structure that fits over the piston pin; Alternatively, the spacer may be constructed as an arc-shaped structure disposed on the periphery of the piston pin.

9. An air suspension system, characterized in that, include: The air compressor according to any one of claims 1-8.

10. A vehicle, characterized in that, include: The air suspension system according to claim 9; And / or, the air compressor according to any one of claims 1-8.

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