Magnetic transmission automobile air conditioner electromagnetic clutch

Abstract

A magnetic transmission automobile air conditioner electromagnetic clutch is structurally composed of a belt pulley, a driven disc, a compressor shaft, a compressor shell, a bearing and a coil. The internal combustion engine drives the belt pulley to rotate; when the air conditioner does not need to work, the coil is not electrified; no magnetic force exists between the belt pulley and the driven disc, and the compressor does not work. When the air conditioner needs to work, the coil is powered on; magnetic forces which attract each other are formed at air gaps among the pulley rim magnetic conductive teeth, the teeth of the driven disc outer magnetic conductive gear ring, the pulley spoke magnetic conductive teeth, the teeth of the driven disc inner magnetic conductive gear ring and the pulley hub magnetic conductive teeth, and the magnetic forces drive the driven disc and the pulley to rotate together, so that the compressor works.

Description

Technical Field

[0001] This utility model relates to an electromagnetic clutch for automotive air conditioning. Background Technology

[0002] Existing automotive air conditioning electromagnetic clutches mainly consist of a pulley, a drive assembly, a coil, and an iron core. One end of the pulley and the drive assembly forms the friction surface, and the coil is installed inside the pulley. The drive assembly is mounted on the compressor shaft via a spline, close to the pulley's friction surface. The compressor is driven by the friction between the pulley and the drive assembly's friction surface. During operation, this type of clutch suffers from reduced transmission capacity due to wear of the friction plates, resulting in low reliability and lifespan. When the air conditioning unit's main shaft seizes up, the belt connecting the engine, compressor, and alternator pulley systems can suffer severe damage or breakage, affecting the normal operation of the engine pulley system and potentially causing the engine to stop or malfunction, leading to traffic accidents and threatening personal safety. Utility Model Content

[0003] The purpose of this invention is to provide a magnetic drive electromagnetic clutch for automotive air conditioning. This clutch mainly consists of a pulley, a driven disc, a compressor shaft, and a coil. Magnetic teeth are formed on the pulley and driven disc. When the coil is energized, the magnetic force between the magnetic teeth on the pulley and the driven disc connects them, enabling the pulley to drive the driven disc to rotate synchronously, thereby driving the compressor. Compared to ordinary electromagnetic clutches, this clutch exhibits less friction between the pulley and driven disc, higher reliability, and a simpler structure.

[0004] The main components of this invention are a pulley, a driven disc, an inner magnetic toothed ring on the driven disc, an outer magnetic toothed ring on the driven disc, a compressor shaft, a compressor housing, a bearing, a coil housing, a coil support, a spring, and a coil. The pulley consists of a hub, spokes, and a rim; an annular cavity is formed between the hub and the rim. Two discontinuous grooves are formed on the spokes to provide magnetic shielding. The hub, spokes, and rim of the pulley each have a uniformly distributed set of magnetic teeth, referred to as the pulley hub magnetic teeth, pulley spoke magnetic teeth, and pulley rim magnetic teeth, respectively. The driven disc is disc-shaped and made of aluminum alloy. An inner magnetic toothed ring and an outer magnetic toothed ring are fixed at the ends opposite the pulley end face. Both rings are made of low-carbon steel, and the number of teeth on both rings is the same as the number of teeth on the pulley. The teeth of both rings have a convex cross-section to increase the magnetic field area, thereby reducing magnetic resistance and increasing magnetic force. During installation, the teeth of the inner magnetic toothed ring are positioned between the pulley hub magnetic teeth and the pulley spoke magnetic teeth, while the teeth of the outer magnetic toothed ring are positioned between the pulley rim magnetic teeth and the pulley spoke magnetic teeth. A spline is formed in the inner hole of the driven disc, and the driven disc is connected to the compressor shaft via the spline. The compressor shaft is stepped and has splines and threads. A spring is fitted on the compressor shaft, with one end pressing against the compressor shaft and the other end pressing against the driven plate. This spring is used to disengage the pulley end face from the driven plate when the compressor is not working, thereby reducing friction. The coil is placed inside the coil housing, which is fixed to the compressor housing by the coil bracket. The coil and coil housing are placed in the annular cavity of the pulley, with a certain gap between them and the pulley. The coil housing also serves as the coil core.

[0005] The positive effects of this invention are as follows: Compared with ordinary electromagnetic clutches, it transmits power by magnetic force during operation, with less friction between the pulley and the driven plate, resulting in higher reliability. Moreover, even if lubricating medium enters between the pulley and the driven plate, it does not affect the magnitude of the power transmission torque. Unlike existing automotive air conditioning electromagnetic clutches, it does not fail due to a sharp drop in friction caused by lubricating medium entering between the pulley and the driven plate. When the air conditioning is overloaded, it can generate relative rotation between the pulley and the driven plate and disengage, achieving overload protection. It also avoids serious damage or breakage of the belt connecting the engine, compressor, and generator pulley systems when the air conditioning compressor spindle seizes, which could affect the normal operation of the engine pulley system and lead to vehicle stoppage or malfunction, posing a threat to personal safety. Attached Figure Description

[0006] Appendix Figure 1This is a structural diagram of the present invention. In the diagram, (1) coil, (2) coil bracket, (3) bearing, (4) compressor shaft, (5) compressor housing, (6) coil housing, (7) pulley, (8) magnetic isolation groove, (9) magnetic guide teeth on the rim of the pulley, (10) magnetic guide teeth ring on the driven plate, (11) magnetic guide teeth on the spokes of the pulley, (12) magnetic guide teeth ring on the driven plate, (13) magnetic guide teeth on the hub of the pulley, (14) spring, (15) nut, (16) spline, (17) retaining ring, and (18) driven plate. Detailed Implementation

[0007] In the attached diagram, the pulley (7) is made of steel and is mounted on the compressor housing (5) via bearing (3); the driven plate (18) is made of aluminum alloy and is mounted on the compressor shaft (4) via spline (16); the inner magnetic toothed ring (12) and the outer magnetic toothed ring (10) of the driven plate are made of steel and are riveted to the driven plate (18); the spring (14) is a spiral or butterfly spring, which is fitted on the compressor shaft (4) and its two ends abut against the compressor shaft (4) and the driven plate (18) respectively; the coil (1) and the coil housing (6) are mounted on the compressor housing (5) via coil bracket (2) and are located in the annular cavity of the pulley (7).

[0008] Working Principle: The internal combustion engine drives the pulley to rotate. When the air conditioning is not needed, the coil is not energized; there is no magnetic force between the magnetic teeth of the pulley and the teeth of the driven disc magnetic ring, and the compressor does not work. When the air conditioning is needed, a large current is first applied to the coil. The magnetic lines of force generated by the coil form a closed loop through the coil housing, pulley, pulley rim magnetic teeth, driven disc outer magnetic ring teeth, pulley spoke magnetic teeth, driven disc inner magnetic ring teeth, pulley hub magnetic teeth, pulley, and coil housing. A magnetic force is formed at the air gap between the pulley rim magnetic teeth, driven disc outer magnetic ring teeth, pulley spoke magnetic teeth, driven disc inner magnetic ring teeth, and pulley hub magnetic teeth. This magnetic force drives the driven disc and pulley to rotate together, making the compressor work. Then, a large current is applied to the coil. The electromagnetic force overcomes the pushing force of the release spring on the driven disc, attracting the driven disc to slide to the left, causing the tooth end face of the driven disc magnetic ring to contact the pulley. The end faces of the magnetic guide teeth of the pulley are in contact; finally, a large current is passed through the coil to keep the clutch engaged; due to the formation of two pairs of air gaps, the torque generated by the magnetic force can be doubled; the transmission capacity is mentioned; when the air conditioner is overloaded or the air conditioner compressor spindle seizes up, relative rotation between the pulley and the driven plate can be generated, which reduces the contact area between the tooth end face of the driven plate magnetic guide tooth ring and the end face of the pulley magnetic guide teeth, thereby reducing the electromagnetic force, and the push force of the release spring on the driven plate pushes the driven plate away; to avoid serious damage or breakage of the belt connecting the engine, compressor and generator pulley system when the air conditioner compressor spindle seizes up, thereby affecting the normal operation of the engine pulley system, causing the vehicle to stop running and malfunction, which poses a threat to personal safety.

[0009] The above description of the preferred embodiments of this utility model is an illustrative example, and this utility model can also be extended to other mechanical fields that require clutches. Those skilled in the art to which this utility model pertains can make various modifications, additions, or similar substitutions to the described preferred embodiments without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A magnetically driven automotive air conditioning electromagnetic clutch, characterized in that: The electromagnetic clutch for a magnetically driven automotive air conditioner consists of a pulley, a driven disc, an inner magnetic toothed ring on the driven disc, an outer magnetic toothed ring on the driven disc, a compressor shaft, a compressor housing, bearings, a coil housing, a coil support, a spring, and a coil. The pulley is composed of a hub, spokes, and a rim. An annular cavity is formed between the hub and the rim. Two discontinuous grooves are formed at the spokes to provide magnetic shielding. The hub, spokes, and rim of the pulley each have a ring of equally distributed magnetic teeth, referred to as the hub magnetic teeth, spoke magnetic teeth, and rim magnetic teeth, respectively.

2. The magnetic drive automotive air conditioning electromagnetic clutch as described in claim 1, characterized in that: The driven disc is disc-shaped and made of aluminum alloy. At the end opposite to the pulley end face, there are inner and outer magnetic toothed rings of the driven disc. The inner and outer magnetic toothed rings of the driven disc are made of low carbon steel. The number of teeth of the inner and outer magnetic toothed rings of the driven disc is the same as the number of teeth of the magnetic toothed ring of the pulley. The tooth cross-section of the inner and outer magnetic toothed rings of the driven disc is convex to increase the magnetic field area, thereby reducing magnetic resistance and increasing magnetic force.

3. The magnetic drive automotive air conditioning electromagnetic clutch as described in claim 1, characterized in that: The compressor shaft is stepped and has splines and threads; the spring is fitted on the compressor shaft, with one end pressing against the compressor shaft and the other end pressing against the driven plate.

4. The magnetic drive automotive air conditioning electromagnetic clutch as described in claim 1, characterized in that: The coil is placed inside the coil housing, which is fixed to the compressor housing by the coil bracket. The coil and coil housing are placed in the annular cavity of the pulley, with a certain gap between them. The coil housing also serves as the coil core.

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