Multistage noise reduction double-piston air compressor for automobile air source

Abstract

The application belongs to the technical field of air compressors, and particularly relates to a double-piston air compressor with multistage noise reduction for automobile air source, which comprises an air compressor cylinder body, a motor protective cover connected to one side of the air compressor cylinder body, an inner cavity of the air compressor cylinder body and an inner part of the motor protective cover being mutually penetrated, a flexible bearing seat being fixedly arranged at one end of the motor, a radial bearing being inlaid in the flexible bearing seat, the motor shaft being in interference fit with the inner ring of the radial bearing, the end of the motor shaft being fixedly connected with an eccentric shaft, the back of a small piston being fixedly connected with a first connecting rod, the back of a large piston being fixedly connected with a second connecting rod, the end of the eccentric shaft being rotatably connected with the first connecting rod, and the first connecting rod and the second connecting rod being rotatably connected through a cross rod arranged along the X axis. The double-piston air compressor is provided with a multistage noise reduction structure, and through the multistage noise reduction structure, the noise of the double-piston air compressor can be reduced from 60-65 dB to 50-55 dB.

Description

Technical Field

[0001] This invention belongs to the field of air compressor technology, specifically relating to a multi-stage noise-reducing dual-piston air compressor for automotive air supply. Background Technology

[0002] Compressed air is now widely used in passenger vehicles to achieve various functions, such as air suspension, seat massage, seat side support, in-vehicle air mattresses, tires, and in-vehicle oxygen generation. Commercial vehicles also use compressed air as a driving force for braking and buses for opening doors. In these diverse applications, dual-piston air compressors account for the vast majority.

[0003] The basic structural types of existing dual-piston air compressors on the market, such as Figure 1 As shown, this structure includes a cylinder and a motor protective shell integrally connected to one side of the cylinder. One end of the motor protective shell has a mounting hole that penetrates the cylinder, and a bearing is embedded in the mounting hole. A motor is installed inside the motor protective shell. The output shaft of the motor is interference-fitted with the small ring of the bearing and enters the inner cavity of the cylinder. An eccentric shaft is fixedly connected to the end of the output shaft, and a connecting rod is rotatably connected to the end of the eccentric shaft. The inner cavity of the cylinder has a chamber space 1 for cooperating with a small piston and a chamber space 2 for cooperating with a large piston at both ends along the Z-axis. The large piston and the small piston are rigidly connected by a connecting rod, and the other end of the connecting rod is rotatably connected to the connecting rod. The chamber space 1 and the chamber space 2 have the same axis, and the connecting rod is connected along this axis between the midpoint of the back of the large piston and the midpoint of the back of the small piston.

[0004] As described above, when the dual-piston air compressor is working, the eccentric shaft rotates and drives the connecting rod to reciprocate. The connecting rod drives the large piston and the small piston to reciprocate vertically along the Z-axis through the connecting rod. During this process, the reaction force of the compressed air in the cylinder cavity and the force of the reciprocating motion of the large and small pistons will impact the rotational connection point between the connecting rod and the connecting rod, i.e., point B. This impact will then be transmitted through the connecting rod to the rotational connection point between the connecting rod and the eccentric shaft, i.e., point A. This impact will then be transmitted through the eccentric shaft to the output shaft, and through the output shaft to the bearing. The bearing will then impact the cylinder, generating vibration and noise. This noise is extremely difficult to eliminate, generally around 60~65dB or even higher, resulting in poor comfort in passenger cars. Summary of the Invention

[0005] This invention discloses a multi-stage noise reduction dual-piston air compressor for automotive air supply, with the aim of improving the comfort of passenger vehicles by reducing the noise of the dual-piston air compressor.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A multi-stage noise-reducing dual-piston air compressor for automotive air supply includes an air compressor cylinder and a motor protective cover connected to one side of the air compressor cylinder. The inner cavity of the air compressor cylinder and the interior of the motor protective cover are interconnected. At both ends of the air compressor cylinder's inner cavity along the Z-axis, there are a first chamber space that mates with a small piston and a second chamber space that mates with a large piston. A motor is fixedly installed inside the motor protective cover. A flexible bearing seat is fixedly installed at the end of the motor facing the motor shaft. A radial bearing is embedded in the flexible bearing seat. The motor shaft and the inner ring of the radial bearing are interference-fitted. An eccentric shaft is fixedly connected to the end of the motor shaft. A first connecting rod is fixedly connected to the back of the small piston, and a second connecting rod is fixedly connected to the back of the large piston. The end of the eccentric shaft is rotatably connected to the first connecting rod. The first and second connecting rods are rotatably connected by a crossbar arranged along the X-axis.

[0007] Preferably, the first chamber space and the second chamber space are staggered along the X-axis or the first chamber space and the second chamber space are coaxial.

[0008] Preferably, the outer wall of the flexible bearing housing is detached from the air compressor cylinder.

[0009] Preferably, when the first chamber space and the second chamber space are staggered along the X-axis, a first connecting rod M is fixedly connected to the center of the back of the small piston along the axial direction of the small piston; a second connecting rod M is fixedly connected to the center of the back of the large piston along the axial direction of the large piston; one end of the crossbar is fixedly connected to the second connecting rod M, and the other end is rotatably connected to the first connecting rod M.

[0010] Preferably, when the first chamber space and the second chamber space are coaxially arranged, a first connecting rod N is fixedly connected to the center of the back of the small piston along the axial direction of the small piston, and two second connecting rods N are symmetrically installed on both sides of the axis of the back of the large piston. The crossbar passes through the first connecting rod N and is rotatably connected to the first connecting rod N. The two ends of the crossbar are respectively fixedly connected to the corresponding second connecting rod N. The second connecting rod N is a plate-shaped structure, and a through hole is opened on the side facing the eccentric shaft for the eccentric shaft to pass through.

[0011] Preferably, the calculation formula based on the air force acting on the large and small pistons is: air pressure = pressure × area of ​​force application, and the air pressure received by the front of the large and small pistons is equal within a certain error range.

[0012] Preferably, the flexible bearing housing is a stepped shell formed by high-pressure die casting of a thin-walled aluminum alloy structure. The large-diameter end of the stepped shell is fixedly connected to the inner wall of the motor protective cover, and the small-diameter end has a through hole two through which the motor shaft passes. A radial bearing is embedded inside the through hole two.

[0013] Preferably, the aluminum alloy material is a die-cast aluminum alloy of AlSi10Mg with a wall thickness of 2.5mm.

[0014] The beneficial effects of this invention, a multi-stage noise-reducing dual-piston air compressor for automotive air supply, are as follows: The dual-piston air compressor of the present invention is equipped with a multi-stage noise reduction structure. Through the multi-stage noise reduction structure, the noise of the dual-piston air compressor can be reduced from 60~65dB to 50~55dB. The compressor with this noise level does not require additional acoustic covering when installed in a vehicle, which greatly reduces costs and also effectively improves the comfort of passenger vehicles. Attached Figure Description

[0015] Figure 1 A cross-sectional structural schematic diagram of an existing dual-piston air compressor along the ZX axis. Figure 2 A cross-sectional view of a dual-piston air compressor according to an embodiment of the present invention along the plane containing the ZX axis; Figure 3 A cross-sectional view of a dual-piston air compressor according to another embodiment of the present invention along the plane containing the ZX axis; Figure 4 Schematic diagram of the invention showing the small-amplitude oscillation of the large and small pistons in the plane containing the ZY axis (a. Schematic diagram of the oscillation principle; b. Force decomposition diagram of the small piston; c. Force decomposition diagram of the large piston). Figure 5 1. Deformation data diagram of the flexible bearing housing of the present invention; Figure 6 Strength data diagram of the flexible bearing housing of the present invention; Figure 7 The noise curve of this invention; Figure 8 Side view of the second connecting rod N.

[0016] The markings in the diagram are: 1. Eccentric shaft one; 2. Connecting rod; 3. Large piston one; 4. Small piston one; 5. Cylinder; 6. Bearing; 7. Motor one and motor protective housing; 8. Chamber space two; 9. Connecting rod; 10. Chamber space one. 50. Eccentric shaft; 51. Large piston; 52. Motor protective cover; 53. Small piston; 54. Crossbar; 55. Air compressor cylinder body; 56. Radial bearing; 57. Flexible bearing housing; 58. Counterweight; 59. Motor stator; 60. Motor rotor; 61. Motor; 62. Rear radial bearing; 63. Second connecting rod M; 64. First connecting rod M; 65. First connecting rod N; 66. Second connecting rod N; 67. Second chamber space; 68. First chamber space. Detailed Implementation

[0017] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they should not be construed as limitations on the present invention.

[0021] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0022] Example 1: A multi-stage noise-reducing dual-piston air compressor for automotive air supply, such as... Figure 1-6As shown, the compressor includes an air compressor cylinder 55 and a motor protective cover 52 connected to one side of the air compressor cylinder 55. The inner cavity of the air compressor cylinder 55 and the interior of the motor protective cover 52 are interconnected. At both ends of the inner cavity of the air compressor cylinder 55 along the Z-axis, there are a first chamber space 68 that cooperates with a small piston 53 and a second chamber space 67 that cooperates with a large piston 51. A motor 61 is fixedly installed inside the motor protective cover 52. A flexible bearing seat 57 is fixedly installed at one end of the motor 61 facing the motor shaft. A radial bearing 56 is embedded in the flexible bearing seat 57. The inner ring of the motor shaft and the radial bearing 56 are interference-fitted. An eccentric shaft 50 is fixedly connected to the end of the motor shaft. A first connecting rod is fixedly connected to the back of the small piston 53, and a second connecting rod is fixedly connected to the back of the large piston 51. The end of the eccentric shaft 50 is rotatably connected to the first connecting rod. The first connecting rod and the second connecting rod are rotatably connected by a crossbar 54 arranged along the X-axis.

[0023] The system incorporates a flexible bearing housing 57, which dissipates the vibration energy transmitted by the radial bearing, achieving a primary noise reduction effect. The eccentric shaft 50 is rotatably connected to the first connecting rod, which in turn is rotatably connected to the second connecting rod via a crossbar. During the rotation of the eccentric shaft, the small and large pistons deflect slightly along the Z and Y axes, allowing the gas pressure received by them to be transmitted to the air compressor cylinder via the deflected portion along the Y axis. On one hand, because the edges of the pistons are elastic, this small-angle deflection prevents noise from the air compressor cylinder. On the other hand, the Y axis decomposes the air pressure acting on the pistons, reducing the force transmitted further to the radial bearing, thus achieving a secondary noise reduction effect.

[0024] Example 2: like Figure 2 As shown, the first chamber space 68 and the second chamber space 67 are staggered along the X-axis or as shown in the figure. Figure 3 As shown, the first chamber space 68 and the second chamber space 67 are coaxially arranged.

[0025] As the best solution, such as Figure 2 As shown, the outer wall of the flexible bearing seat 57 is detached from the air compressor cylinder 55, thereby completely avoiding noise generated by the air compressor cylinder due to vibration and impact, achieving a three-level noise reduction effect.

[0026] Example 3: like Figure 2As shown, when the first chamber space 68 and the second chamber space 67 are staggered along the X-axis, a first connecting rod M64 is fixedly connected to the center of the back of the small piston 53 along the axial direction of the small piston 53; a second connecting rod M63 is fixedly connected to the center of the back of the large piston 51 along the axial direction of the large piston 51; one end of the crossbar 54 is fixedly connected to the second connecting rod M63, and the other end is rotatably connected to the first connecting rod M64.

[0027] Example 4: like Figure 3 As shown, when the first chamber space 68 and the second chamber space 67 are coaxially arranged, a first connecting rod N65 is fixedly connected to the center of the back of the small piston 53 along the axial direction of the small piston 53. Two second connecting rods N66 are symmetrically installed on both sides of the axis of the back of the large piston 51. The crossbar 54 passes through the first connecting rod N and is rotatably connected to the first connecting rod N. The two ends of the crossbar 54 are fixedly connected to the corresponding second connecting rods N66. The second connecting rod N66 is a plate-shaped structure, and a through hole (not marked in the figure) is opened on the side facing the eccentric shaft 50 for the eccentric shaft 50 to pass through.

[0028] In this embodiment, the second connecting rod is improved to a second connecting rod N set on both sides of the central shaft of the large piston. The second connecting rod N is further improved to a plate structure. The plate structure near the eccentric shaft is provided with a through hole 1. The eccentric shaft 50 can enter between the two second connecting rods N66 through the through hole 1 and is rotatably connected to the lower end of the first connecting rod N65. The crossbar 54 is rotatably connected to the upper part of the first connecting rod N65. When the eccentric shaft 50 pulls the first connecting rod N downward, the small piston and the large piston move down synchronously, and vice versa. During the upward and downward movement, the air compressor cylinder body realizes the actions of air intake, compression and air discharge.

[0029] like Figure 4 As shown, since the first connecting rod and the second connecting rod are rotatably connected by a crossbar, a certain degree of deflection will occur during the process of the small piston moving down and the large piston moving up. The direction of the air pressure on the large and small pistons is changed by the deflection, so that the force transmitted to the radial bearing is relatively reduced.

[0030] It should be noted that the eccentric shaft should be installed on the end of the first connecting rod N65 as far away from the small piston as possible, and the crossbar should be connected to the side of the second connecting rod N66 as far away from the large piston as possible. The purpose of this arrangement is to maximize the distance between the eccentric shaft and the small piston, thus improving the flexibility of the swing. Similarly, maximizing the distance between the crossbar and the large piston also ensures good swing flexibility for the large piston and prevents abrupt force transmission.

[0031] Example 5: like Figure 2-4As shown, based on the calculation formula of the air force acting on the large piston 51 and the small piston 53: air pressure = pressure × force area, the air pressure received by the front of the large piston and the small piston is equal within a certain error range.

[0032] In this embodiment, the air pressure received by the large piston and the small piston is set to be equal within a certain error range. The balanced force between the large and small pistons further reduces the noise of the air compressor, achieving a four-level noise reduction effect.

[0033] Example 6: like Figure 2-6 As shown, the flexible bearing housing 57 is a stepped shell formed by high-pressure die casting of aluminum alloy thin-walled structure. The large-diameter end of the stepped shell is fixedly connected to the inner wall of the motor protective cover 52, and the small-diameter end is provided with a through hole 2 through which the motor shaft passes. A radial bearing 56 is embedded in the inner side of the through hole 2.

[0034] Specifically, the aluminum alloy material has a wall thickness between 1.5mm and 4.5mm; as a preferred embodiment, the aluminum alloy material is a die-cast AlSi10Mg aluminum alloy with a wall thickness of 2.5mm. This material ensures that the vibration transmitted by the radial bearing does not damage the aluminum alloy during the operation of the air compressor, while also controlling the deformation of the aluminum alloy to approximately 0.03mm. This deformation effectively absorbs and filters the impact force of the pistons of different sizes and reduces noise.

[0035] Example 7: The motor is a dual-output-shaft motor, located within a motor protective cover. Air compressor cylinders are located at both ends of the motor protective cover. Both output shafts are equipped with flexible bearing seats and radial bearings, and eccentric shafts are connected to the ends of the output shafts. The two air compressor cylinders have identical structures, each including a large piston, a small piston, a first connecting rod, a second connecting rod, and a crossbar, thus forming two sets of dual-piston air compressors driven by the same motor. Two sets of dual-piston air compressors driven by the same motor can meet the needs of more application scenarios. This four-piston air compressor can be used in parallel with two cylinders to provide sufficient displacement. Through the coordinated use of two sets of large and small pistons, higher pressure input can be provided; the pressure input value has been verified to reach ≤21 bar.

[0036] Working principle of the invention: The large piston 51 and the small piston 53 are connected and driven together by an eccentric shaft. When the large piston 51 draws in air, the small piston 53 compresses it; when the large piston 51 exhausts air, the small piston 53 draws in air. Since gas pressure equals gas intensity multiplied by the area of ​​force application, the small piston 51 has higher pressure and a smaller area, while the large piston 53 has lower pressure and a larger area. By rationally designing the areas of force application of the large and small pistons, the gas pressure on both pistons can be made similar. This balanced force application reduces the noise of the air compressor.

[0037] like Figure 2 As shown, while the small piston 53 moves up and down, point D will also undergo circular motion in the YZ-axis plane under the influence of the eccentric shaft, causing the small piston 53 to have a certain swing angle. This small-amplitude swing of the small piston 53 will cause the large piston 51 to swing freely accordingly. The small-amplitude swings of the small piston 53 and the large piston 51 will decompose the force on the pistons, with some of the force acting on the cylinder wall, thus reducing the impact force of the small piston 53 and the large piston 51 in the up-down direction. Consequently, the force transmitted to the eccentric shaft 50 will also be reduced. This structure will greatly reduce noise generation.

[0038] like Figure 4 As shown, taking the plane containing the Y and Z axes, the gas pressure on the small piston is Fp_small, and the gas pressure on the large piston is Fp_large. Outside of the operating positions of the large and small pistons when they are fully inhaled or compressed to the bottom, the directions of the gas pressures Fp_small and Fp_large are inclined. The characteristic of this structure is that it can decompose and transfer a portion of the force along the Y-axis to the cylinder block, namely Fp_small and Fp_large. s1 and F b1 Since the main forces causing noise are the reciprocating inertia of the piston and the air pressure acting on the piston, this design can transfer some of the piston's reciprocating inertia and the gas force.

[0039] like Figure 2 As shown, the gas pressure on the large piston 51 is transmitted to the small piston 53 via the horizontal shaft 54 ​​through point E (rotational connection). The gas pressure on the small piston 53 is then transmitted to point D, the rotational connection point between the eccentric shaft 50 and the first connecting rod. The eccentric shaft 50 is connected to the motor shaft, which is connected to the flexible bearing seat 57 via the radial bearing 56. By adopting a high-pressure die-cast aluminum alloy thin-walled stepped structure design, when the bearing seat is subjected to an impact force of 1500N, the flexible bearing seat made of AlSi10Mg die-cast aluminum alloy with a wall thickness of 2.5mm can achieve a flexible deformation of approximately 0.03mm without damaging the aluminum alloy. This deformation can effectively absorb and filter the impact force of the piston and reduce noise.

[0040] Deformation data of flexible bearing housing as follows Figure 5As shown, the maximum stress on the structure is approximately 63 MPa, and the material strength can reach around 180 MPa; this nearly three-fold margin ensures the long-term use of the structure.

[0041] Strength data for flexible bearing housings are as follows: Figure 6 As shown, by using the above piston connecting rod structure and a flexible bearing housing with a stepped structure of AlSi10Mg+ and a wall thickness of 2.5mm, the noise of the piston connecting rod compressor can be reduced to 50~55dB.

[0042] As described above, the flexible bearing housing 57 of this invention is designed to have a certain degree of elasticity when subjected to forces transmitted from the radial bearing. This elasticity can offset part of the gas force and reciprocating inertial force transmitted from the piston. Thin-walled metal is used as the material, and several horn-shaped steps are further used to enhance toughness. Typically, a thin-walled aluminum alloy component of about 2-3 mm thickness can be selected, and about 2-3 steps can be made. This allows it to withstand 1-3 kN of motion impact, an impact force applicable to automotive piston compressors with a displacement of 10-200 L / min. Resistance to motion impact can be further improved by increasing the thickness.

[0043] like Figure 7 The noise curve of the present invention is shown in the figure, and the relevant data are shown in the table below: .

[0044] As described above, the dual-piston air compressor of the present invention is equipped with a multi-stage noise reduction structure. Through the multi-stage noise reduction structure, the noise of the dual-piston air compressor can be reduced from 60~65dB to 50~55dB. The compressor with this noise level does not require additional acoustic covering when installed in a vehicle, which greatly reduces costs and also effectively improves the comfort of the passenger car.

Claims

1. A multi-stage noise-reducing dual-piston air compressor for automotive air supply, characterized in that: The device includes an air compressor cylinder and a motor protective cover connected to one side of the air compressor cylinder. The inner cavity of the air compressor cylinder and the interior of the motor protective cover are interconnected. At both ends of the air compressor cylinder's inner cavity along the Z-axis, there are a first chamber space that cooperates with a small piston and a second chamber space that cooperates with a large piston. A motor is fixedly installed inside the motor protective cover. A flexible bearing seat is fixedly installed at the end of the motor facing the motor shaft. A radial bearing is embedded in the flexible bearing seat. The motor shaft and the inner ring of the radial bearing are interference-fitted. An eccentric shaft is fixedly connected to the end of the motor shaft. A first connecting rod is fixedly connected to the back of the small piston, and a second connecting rod is fixedly connected to the back of the large piston. The end of the eccentric shaft is rotatably connected to the first connecting rod. The first connecting rod and the second connecting rod are rotatably connected by a crossbar set along the X-axis.

2. The multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 1, characterized in that: The first chamber space and the second chamber space are arranged alternately along the X-axis or the first chamber space and the second chamber space are arranged coaxially.

3. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 2, characterized in that: The outer wall of the flexible bearing housing is detached from the air compressor cylinder.

4. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 3, characterized in that: When the first chamber space and the second chamber space are staggered along the X-axis, a first connecting rod M is fixedly connected to the center of the back of the small piston along the axis of the small piston; a second connecting rod M is fixedly connected to the center of the back of the large piston along the axis of the large piston, one end of the crossbar is fixedly connected to the second connecting rod M, and the other end is rotatably connected to the first connecting rod M.

5. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 3, characterized in that: When the first chamber space and the second chamber space are coaxially arranged, a first connecting rod N is fixedly connected to the center of the back of the small piston along the axial direction of the small piston. Two second connecting rods N are symmetrically installed on both sides of the axis of the back of the large piston. The crossbar passes through the first connecting rod N and is rotatably connected to the first connecting rod N. The two ends of the crossbar are respectively fixedly connected to the corresponding second connecting rod N. The second connecting rod N is a plate-shaped structure with a through hole for the eccentric shaft to pass through on the side facing the eccentric shaft.

6. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 5, characterized in that: Based on the calculation formula of the air force acting on the large and small pistons: air pressure = pressure × area, the air pressure received by the large and small pistons on their front surfaces is equal within a certain error range.

7. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 6, characterized in that: The flexible bearing housing is a stepped shell formed by high-pressure die casting of a thin-walled aluminum alloy structure. The large-diameter end of the stepped shell is fixedly connected to the inner wall of the motor protective cover, and the small-diameter end has a through hole two through which the motor shaft passes. A radial bearing is embedded inside the through hole two.

8. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 7, characterized in that: The aluminum alloy material has a wall thickness between 1.5 mm and 4.5 mm.

9. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in claim 8, characterized in that: The aluminum alloy material is a die-cast aluminum alloy of AlSi10Mg with a wall thickness of 2.5mm.

10. A multi-stage noise-reducing dual-piston air compressor for automotive air supply as described in any one of claims 1-9, characterized in that: The motor is a dual-output shaft motor, which is located inside a motor protective cover. Air compressor cylinders are respectively provided at both ends of the motor protective cover. Both output shafts are equipped with flexible bearing seats and radial bearings, and eccentric shafts are connected to the ends of the output shafts. The two sets of air compressor cylinders have the same structure, including a large piston, a small piston, a first connecting rod, a second connecting rod, and a crossbar, and are thus configured as two sets of dual-piston air compressors driven by the same motor.

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