An electromagnetic clutch for automotive air conditioning with a dust cover

Abstract

This utility model provides an automotive air conditioning electromagnetic clutch with a dust cover, including a pulley. A monitoring dust cover assembly is fixedly installed on the outer surface of the pulley. The shaft cover and the clutch magnetic chuck are located inside the monitoring dust cover assembly. The shaft cover and the clutch magnetic chuck are elastically connected by a leaf spring. One end of the compressor input shaft slides through the clutch magnetic chuck and is fixedly connected to the shaft cover. The compressor input shaft is rotatably connected to the inner ring of the electromagnetic coil assembly, and the outer ring of the electromagnetic coil assembly is rotatably connected to the pulley. This utility model features a reverse coupling monitoring block in the dust cover, which uses a magnetic field to cause the sealing cylinder to expand and contract, facilitating the judgment of the electromagnetic coil status and improving fault diagnosis efficiency. Spring washers and magnetic rings are included to enhance sealing and dustproof performance, reduce maintenance costs, and improve maintenance convenience.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning electromagnetic clutch technology, and particularly relates to an automotive air conditioning electromagnetic clutch with a dust cover. Background Technology

[0002] In automotive air conditioning systems, the swashplate compressor is a key component, and its stable operation is crucial. The swashplate compressor mainly consists of a rear end cover, valve cover, housing, piston, swashplate, and electromagnetic clutch. The electromagnetic clutch, primarily composed of a suction cup, pulley, and electromagnetic coil, plays a vital role in driving the compressor. During normal operation, the electromagnetic clutch precisely controls the compressor's working state: when the compressor needs to operate, the electromagnetic coil is energized, rapidly generating a strong magnetic field that tightly attracts the suction cup and pulley, causing the pulley to drive the suction cup to rotate synchronously, thus driving the compressor shaft; when the electromagnetic coil is de-energized, the suction cup separates from the pulley using its self-designed leaf spring, and the compressor immediately stops working.

[0003] To ensure the efficient operation of electromagnetic clutches and prevent dust or impurities from accumulating on the suction cup and pulley surfaces and affecting engagement, existing technologies typically incorporate a dust cover structure on the clutch. Currently, most widely used dust covers are made of polymer materials and are opaque. While these dust covers play a crucial role in preventing external impurities or dust from entering and effectively protecting the internal components of the clutch, their opacity introduces new problems. During automotive repair and maintenance, mechanics cannot directly observe the internal workings of the clutch, making it difficult to quickly and accurately determine if a malfunction in the electromagnetic coil assembly is causing the suction cup to fail to engage with the pulley. This not only increases the difficulty and time cost of troubleshooting but may also disrupt the normal operation of the automotive air conditioning system due to delayed repairs, reducing the user experience. Furthermore, existing dust covers are mostly designed solely for dust prevention, lacking effective means of monitoring the electromagnetic clutch's operating status. This fails to provide timely and accurate fault diagnosis information to repair personnel, hindering the intelligent maintenance and management of automotive air conditioning systems.

[0004] Therefore, it is essential to invent an electromagnetic clutch for automotive air conditioning with a dust cover. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an automotive air conditioning electromagnetic clutch with a dust cover, including a pulley, a monitoring dust cover assembly, a shaft cover, a clutch magnetic chuck, a leaf spring, a compressor input shaft, and an electromagnetic coil assembly. The monitoring dust cover assembly is fixedly installed on the outer surface of the pulley. The shaft cover and the clutch magnetic chuck are located inside the monitoring dust cover assembly. The shaft cover and the clutch magnetic chuck are elastically connected by the leaf spring. One end of the compressor input shaft slides through the clutch magnetic chuck and is fixedly connected to the shaft cover. The compressor input shaft is rotatably connected to the inner ring of the electromagnetic coil assembly, and the outer ring of the electromagnetic coil assembly is rotatably connected to the pulley.

[0006] Preferably, the monitoring dust cover assembly includes a dust cover shell, a magnetic ring, a top rod, a monitoring block, a sealing cylinder, and a return spring. The dust cover shell is fixedly installed on the outer surface of the pulley, and the shaft cover and clutch magnetic chuck are located inside the dust cover shell. Magnetic rings are provided on the inner wall of the dust cover shell. One end of the top rod, which is slidably installed on the dust cover shell, is fitted with a monitoring block, and the other end is fixed to the inner wall of one end of the sealing cylinder. The other end of the sealing cylinder is fixedly connected to the end face of the dust cover shell, and the inside of the sealing cylinder is elastically connected to the end face of the dust cover shell through a return spring.

[0007] Preferably, a spring washer is provided between the dust cover and the outer surface of the pulley, the clutch magnetic chuck provided inside the dust cover can be magnetically attracted to the outer surface of the pulley, and the magnetic rings are arranged horizontally at equal intervals on the inner wall of the dust cover.

[0008] Preferably, a through hole is provided on the dust cover for slidingly mounting the top rod. A monitoring block is embedded at one end of the top rod that extends into the dust cover. The monitoring block is a flat disk-shaped structure made of high-performance permanent magnet, and its axial magnetic field direction is coupled 180 degrees in opposite direction to the main magnetic field generated by the electromagnetic coil assembly.

[0009] Preferably, the end of the top rod extending out of the dust cover is fixedly connected to the end inside the sealing cylinder, and the sealing cylinder is a corrugated telescopic sealing cover structure.

[0010] Preferably, the sealing cylinder encloses the protruding part of the top rod and the return spring inside, with one end of the return spring connected to the inner end face of the sealing cylinder and the other end connected to the outer surface of the dust cover.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention incorporates a monitoring block within the dust cover assembly. Utilizing the reverse coupling of the monitoring block and the electromagnetic coil assembly's magnetic field, when the electromagnetic coil assembly generates a magnetic field during normal operation, the monitoring block displaces due to the magnetic field interaction, causing the sealing cylinder to extend or retract via a push rod. Maintenance personnel can directly observe the extension or retraction of the sealing cylinder to quickly determine whether the electromagnetic coil assembly is functioning correctly and whether the magnetic force generated by the magnetic field is within normal limits, significantly improving troubleshooting efficiency.

[0013] This utility model features a dust cover that is fixedly installed on the outer surface of the pulley, with a spring washer between them to further enhance the tightness of the connection and effectively prevent dust from entering the clutch from the connection point. Simultaneously, the inner wall of the dust cover is horizontally and equidistantly arranged with magnetic rings, which not only optimizes the magnetic field coupling effect between the monitoring block and the electromagnetic coil assembly but also plays a certain role in adsorbing and intercepting tiny magnetic impurities that may enter the dust cover, thus improving the overall dustproof performance.

[0014] The design of this novel monitoring dust cover assembly allows maintenance personnel to preliminarily determine the working status of the electromagnetic clutch simply by observing the state of the sealing cylinder outside the dust cover, without disassembling complex clutch components. This provides a clear direction for maintenance work, greatly reduces maintenance time and labor costs, and improves the convenience of maintaining the automotive air conditioning system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a half-sectional structural diagram of the present invention.

[0017] Figure 3 This is a half-sectional structural diagram of the monitoring dust cover assembly of this utility model.

[0018] In the picture:

[0019] 1. Belt pulley, 2. Monitoring dust cover assembly, 21. Dust cover housing, 22. Magnetic ring, 23. Top rod, 24. Monitoring block, 25. Sealing cylinder, 26. Return spring, 3. Shaft cover, 4. Clutch magnetic chuck, 5. Steel leaf spring, 6. Compressor input shaft, 7. Electromagnetic coil assembly. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 3 As shown:

[0023] This utility model provides an automotive air conditioning electromagnetic clutch with a dust cover, comprising a pulley 1, a monitoring dust cover assembly 2, a shaft cover 3, a clutch magnetic chuck 4, a leaf spring 5, a compressor input shaft 6, and an electromagnetic coil assembly 7. The monitoring dust cover assembly 2 is fixedly installed on the outer surface of the pulley 1. The shaft cover 3 and the clutch magnetic chuck 4 are located inside the monitoring dust cover assembly 2. The shaft cover 3 and the clutch magnetic chuck 4 are elastically connected by the leaf spring 5. One end of the compressor input shaft 6 slides through the clutch magnetic chuck 4 and is fixedly connected to the shaft cover 3. The compressor input shaft 6 is rotatably connected to the inner ring of the electromagnetic coil assembly 7, and the outer ring of the electromagnetic coil assembly 7 is rotatably connected to the pulley 1.

[0024] Furthermore, the monitoring dust cover assembly 2 includes a dust cover shell 21, a magnetic ring 22, a push rod 23, a monitoring block 24, a sealing cylinder 25, and a return spring 26. The dust cover shell 21 is injection molded from high-strength fiberglass composite material and is fixedly connected to the annular flange on the outer surface of the pulley 1 by multiple hexagonal bolts. A nitrile rubber sealing gasket is installed between the contact surfaces to prevent mud and water seepage. The shaft cover 3 and the clutch magnetic chuck 4 are completely within the closed cavity formed by the dust cover shell 21. The inner wall of the dust cover shell 21 maintains a reasonable radial clearance with the shaft cover 3. The magnetic ring 22, made of DT4 electrical pure iron, is bonded to the inner wall of the dust cover shell 21 with epoxy resin. The push rod 23 is a heat-treated stepped shaft structure that slides through a pre-set through hole in the dust cover shell 21. One end of the push rod 23, located inside the dust cover 21, is fitted with a monitoring block 24 via an interference fit. The other end is fixedly connected to a metal flange fitted at one end of the sealing cylinder 25 via argon arc welding. The sealing cylinder 25 is made using a rubber bellows molding process. The return spring 26 is a cylindrical helical spring, with one end hooked onto a spring seat inside the sealing cylinder 25, and the other end elastically connected to a boss on the end face of the dust cover 21 via a snap-fit ​​structure.

[0025] Furthermore, a circumferentially evenly distributed spring washer is added between the dust cover 21 and the outer surface of the pulley 1. This washer is made of 65Mn spring steel and can compensate for assembly errors through elastic deformation, ensuring that the contact surfaces of the two are always in close contact. The clutch magnetic chuck 4 inside the dust cover 21 is made of No. 20 steel and has undergone carburizing and quenching treatment. Its friction surface is precision ground. When the electromagnetic coil assembly 7 is energized, it can form an effective magnetic attraction with the hardened friction surface of the outer surface of the pulley 1, and the contact area of ​​the magnetic attraction surface is not less than 85%. Magnetic guide rings 22 are arranged axially at intervals on the inner wall of the dust cover 21. The inner ring of the magnetic guide ring 22 maintains good coaxiality with the inner wall of the dust cover 21, forming a continuous magnetic conduction path and enhancing the magnetic field coupling efficiency between the monitoring block 24 and the electromagnetic coil assembly 7.

[0026] Furthermore, the through hole in the dust cover 21 is precision bored, ensuring good perpendicularity between the hole axis and the end face of the dust cover 21. A solid lubricant is sprayed onto the inner wall of the through hole to reduce sliding friction of the push rod 23. One end of the push rod 23 extending into the dust cover 21 has a mounting step. The monitoring block 24 is made of N52 neodymium iron boron permanent magnets, forming a flat, disc-shaped structure. It is fixed to the mounting step with epoxy resin adhesive. Its axial magnetic field direction is precisely 180° opposite to the main magnetic field generated by the electromagnetic coil assembly 7, with the magnetic field strength deviation controlled within a reasonable range. The outer surface of the monitoring block 24 maintains an appropriate radial clearance from the inner wall of the dust cover 21 to avoid magnetic interference during rotation.

[0027] Furthermore, one end of the top rod 23 extending outside the dust cover 21 is securely connected to a metal flange embedded inside the sealing cylinder 25. The weld between the flange and the sealing cylinder 25 has undergone leak testing to ensure reliable sealing. The sealing cylinder 25 is a corrugated telescopic sealing cover structure with effective telescopic stroke. Its inner wall is lined with a fluororubber layer, which ensures both telescopic flexibility and good oil and temperature resistance.

[0028] Furthermore, the sealing cylinder 25 completely encloses the protruding part of the push rod 23 and the return spring 26, forming an independent sealed cavity. The two ends of the return spring 26 are connected to the outer surfaces of the sealing cylinder 25 and the dust cover 21, respectively. The spring force during operation is reasonably designed to ensure that the push rod 23 can be quickly reset after the electromagnetic coil assembly 7 is de-energized.

[0029] The working principle is as follows: First, when the electromagnetic coil assembly 7 is not energized, the clutch magnetic chuck 4 is separated from the pulley 1 under the elastic force of the steel plate spring 5, and the compressor input shaft 6 does not rotate with the pulley 1. At this time, the monitoring block 24 in the monitoring dust cover assembly 2 is not affected by the magnetic field force, the reset spring 26 is in a natural extension and contraction state, and the push rod 23 drives the sealing cylinder 25 to remain in a contracted state under the pulling force of the reset spring 26.

[0030] Secondly, when the electromagnetic coil assembly 7 is energized, the axial magnetic field it generates will form a reinforced magnetic circuit through the magnetic ring 22. Under the attraction of the magnetic field, the clutch magnetic chuck 4 overcomes the elastic force of the steel leaf spring 5 and tightly engages with the hardened friction surface on the outer surface of the pulley 1. At this time, the rotational power of the pulley 1 is transmitted to the compressor input shaft 6 through the clutch magnetic chuck 4 and the shaft cover 3, driving the compressor to run.

[0031] Furthermore, while the electromagnetic coil assembly 7 generates a magnetic field, the monitoring block 24 is made of N52 neodymium iron boron permanent magnet and its axial magnetic field direction is 180° opposite to that of the main magnetic field. A radial repulsive force is generated between the two. This repulsive force pushes the push rod 23 to slide along the through hole of the dust cover 21, simultaneously stretching the reset spring 26 and causing the sealing cylinder 25 to extend outward. Maintenance personnel can visually judge whether the magnetic field strength of the electromagnetic coil assembly 7 is normal by observing the extension state of the sealing cylinder 25.

[0032] Finally, when the electromagnetic coil assembly 7 is de-energized, the main magnetic field disappears, the clutch magnetic chuck 4 separates from the pulley 1 under the elastic force of the steel leaf spring 5, and the compressor stops working; at the same time, the monitoring block 24 loses the magnetic field repulsion force, the reset spring 26 releases elastic potential energy, pulls the top rod 23 to reset and drives the sealing cylinder 25 to contract, so that the monitoring dust cover assembly 2 returns to its initial state.

[0033] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. An electromagnetic clutch for automotive air conditioning with a dust cover, characterized in that, The assembly includes a pulley (1), a monitoring dust cover assembly (2), a shaft cover (3), a clutch magnetic chuck (4), a leaf spring (5), a compressor input shaft (6), and an electromagnetic coil assembly (7). The monitoring dust cover assembly (2) is fixedly installed on the outer surface of the pulley (1). The shaft cover (3) and the clutch magnetic chuck (4) are located inside the monitoring dust cover assembly (2). The shaft cover (3) and the clutch magnetic chuck (4) are elastically connected by the leaf spring (5). One end of the compressor input shaft (6) slides through the clutch magnetic chuck (4) and is fixedly connected to the shaft cover (3). The compressor input shaft (6) is rotatably connected to the inner ring of the electromagnetic coil assembly (7). The outer ring of the electromagnetic coil assembly (7) is rotatably connected to the pulley (1).

2. The electromagnetic clutch of claim 1, wherein: The monitoring dust cover assembly (2) includes a dust cover shell (21), a magnetic ring (22), a top rod (23), a monitoring block (24), a sealing cylinder (25), and a return spring (26). The dust cover shell (21) is fixedly installed on the outer surface of the pulley (1). The shaft cover (3) and the clutch magnetic chuck (4) are located inside the dust cover shell (21). The inner wall of the dust cover shell (21) is provided with a magnetic ring (22). One end of the top rod (23) slidably installed on the dust cover shell (21) is fitted with a monitoring block (24), and the other end is fixed to the inner wall of one end of the sealing cylinder (25). The other end of the sealing cylinder (25) is fixedly connected to the end face of the dust cover shell (21). The inside of the sealing cylinder (25) is elastically connected to the end face of the dust cover shell (21) through the return spring (26).

3. The electromagnetic clutch of claim 2, wherein: the dust cover is formed of a material having a coefficient of friction of 0.1 to 0.

3. A spring washer is provided between the dust cover (21) and the outer surface of the pulley (1). The clutch magnetic chuck (4) provided inside the dust cover (21) can be magnetically attracted to the outer surface of the pulley (1). The magnetic rings (22) are arranged horizontally and equidistantly on the inner wall of the dust cover (21). ​ 4. The electromagnetic clutch of claim 3, wherein: the dust cover is formed of a material having a coefficient of friction of 0.1 to 0.

3. The dust cover (21) has a through hole through which the top rod (23) is slidably installed. The top rod (23) is inserted into the dust cover (21) at one end and a monitoring block (24) is embedded therein. The monitoring block (24) is a flat disk-shaped structure made of high-performance permanent magnets, and its axial magnetic field direction is 180 degrees opposite to the main magnetic field generated by the electromagnetic coil assembly (7). ​ 5. The automotive air conditioning electromagnetic clutch with a dust cover as described in claim 4, characterized in that: The top rod (23) extends out of the dust cover (21) and is fixedly connected to one end inside the sealing cylinder (25). The sealing cylinder (25) is a corrugated telescopic sealing cover structure.

6. A dust cover-equipped electromagnetic clutch for an automobile air conditioner according to claim 5, characterized in that: The sealing cylinder (25) encloses the protruding part of the top rod (23) and the return spring (26). One end of the return spring (26) is connected to the inner end face of the sealing cylinder (25), and the other end is connected to the outer surface of the dust cover (21).

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