JPS6246871Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to swash plate type, rocking swash plate type, rotary type, scroll type compressors, etc., and particularly relates to improvements in compressors for vehicle air conditioning.

In a compressor for vehicle air conditioning, a rotary drive shaft extends from the front housing of the compressor, and driving force is obtained from the vehicle engine through an electromagnetic clutch device attached to the extension of the drive shaft. .

Conventionally, as shown in FIG. 3, the clutch mounting boss 3a protrudes from the front surface of the front housing 3 as an extension of the shaft sealing chamber 5 formed approximately at the center of the front housing 3, and is formed integrally with the front housing 3. It had been. Therefore, when assembling the rotating contact ring 6 and the fixed contact ring 20 that constitute the mechanical seal from the front side of the drive shaft 4, it is very time-consuming because of the large depth, and the fixed contact ring 20 has a small mass and is suspended by the O-ring 21, making it difficult for heat to be transferred to other parts, resulting in a significant temperature rise. This accelerated the deterioration of the carbon in the O-ring 21 and the rotating contact ring 6. Furthermore, since the front housing 3 itself has a complicated shape, the wall thickness is uneven, which can cause cavities, and the cutting allowance due to the draft angle becomes large, which not only makes machining troublesome, but also easily exposes cavities, which can lead to cavity leakage. It was the cause of

The purpose of this invention is to eliminate the above-mentioned drawbacks, and by making it possible to form the front housing and clutch mounting boss separately and then assemble them, it is easy to process the front housing and clutch mounting boss. It is an object of the present invention to provide a compressor for vehicle air conditioning, which can be easily installed with a mechanical seal, etc. The present invention will be explained in detail below based on the illustrated embodiments.

In FIG. 1, 1 is a cylinder body of, for example, a rotary swash plate compressor, 2 is a valve body, and 3 is a front housing having a suction chamber and a discharge chamber, which closes off the front end side of the cylinder body 1. 4 is the drive shaft, which is connected to the compressor cylinder body 1 on the front housing side.
and extends from the front housing. Reference numeral 5 denotes a shaft sealing chamber formed approximately in the center of the front housing 3. Reference numeral 7 denotes a clutch mounting boss, which is integrally formed with a disk-shaped base plate 7A having a drive shaft through hole 7C formed through the shaft center, and a cylindrical body 7B that protrudes from the front surface of the base plate 7A and holds the bearing 9. By bringing the back surface of the outer peripheral side of this board 7A into contact with the front surface of the annular protrusion 3A formed at the front of the front housing 3 and tightening with an appropriate number of screws 8, the clutch mounting boss 7 can be attached to the front. housing 3
At the same time, the back surface of the peripheral part of the drive shaft through hole 7C penetrated through the axial center of the substrate 7A serves to position the rotary contact ring 6 in the axial direction and to contact the front end surface of the rotary contact ring 6 to perform a sealing function. Forms a sealing surface that controls. The clutch device A is fitted with a pulley 10 rotatably attached to the outer peripheral portion of the cylindrical portion 7B of the clutch mounting boss through a bearing 9 and the annular protrusion 3A of the front housing 3. An annular stator 12 including an electromagnet 11 fixed to the front surface of the outer periphery, a rotor 13 fixed to the drive shaft 4 and located at the front side of the clutch device A, and an elastic member movable only in the axial direction. and a clutch plate 15 attached to the rotor 13 by 14.

With the above configuration, when assembling, the rotating contact ring 6
Since the shaft sealing chamber 5 housing the contact ring 6 is exposed on the front end surface of the annular protrusion 3A of the front housing 3,
can be easily assembled into the shaft sealing chamber 5, and the stator 12 of the clutch device A can be fixed at the same time when the outer peripheral side of the base plate 7A of the clutch mounting boss 7 is fastened to the annular protrusion 3A. I can do it. The material of the clutch mounting boss 7 is aluminum.
It is preferable that the sliding contact surface with carbon of the rotating contact ring 6 on the back side of the substrate 7A be coated with Cr, and as other materials, wear-resistant members such as FC and hardened SC materials may also be used. can.

Next, the substrate 7A that becomes the sliding contact portion with the rotating contact ring 6
By integrating the clutch mounting boss 7 with the clutch mounting boss 7, the heat generated on the sliding surface with the contact ring 6 is quickly transmitted to the entire clutch mounting boss 7, and the large surface area of the clutch mounting boss 7 increases the heat dissipation effect. In good condition. Therefore, it is possible to prevent the O-ring from being hardened by heat and the carbon of the rotating contact ring 6 from deteriorating due to temperature rise.

In addition, the shape of the front housing 3 is simplified, the wall thickness can be made uniform, and the occurrence of blowholes can be prevented. It also makes it possible to cast out holes, which reduces machining allowance and makes machining easier.

In addition, as another embodiment, as shown in FIG. 2, the stator 12 is fixed with screws 8, and the connection between the peripheral wall of the shaft sealing chamber 5 and the rotating contact ring 6 is provided on the back side of the base plate 7A of the clutch mounting boss 7. A second boss portion 7 that can be inserted between
It is also possible to protrude the boss portion 7D, provide a screw on the peripheral wall of the shaft sealing chamber, and screw the outer periphery of the boss portion 7D into the provided screw hole.

As described above, according to the present invention, since the front housing and the clutch mounting boss are made separate and can be assembled, it is easy to assemble the rotary contact ring, and the base plate that becomes the contact part with the contact ring can be easily assembled. This also serves as the mounting member for the clutch mounting boss to the front housing, and because the board is integrally molded from the same material as the cylinder that holds the pulley of the clutch device, this occurs on the sliding surface with the rotating contact ring. The generated heat is immediately transmitted to the entire clutch mounting boss, which has a large surface area, and unlike conventional fixed contact rings, the material is different from that of the front housing, the air layer that exists in the fitting gap with the housing, and the contact area with the housing are small. The heat transfer coefficient is high compared to the low heat transfer coefficient, and the heat dissipation is good, which prevents the O-ring from deteriorating due to heat, and the front housing and clutch mounting boss are separate. As a result, the wall thickness can be made uniform, preventing blowholes caused by uneven wall thickness and eliminating blowhole leakage.Furthermore, the annular protrusion 3A of the front housing can be used to attach the clutch mounting boss to the board. In addition to controlling the clutch device's stator, it can also be used as a fitting guide and positioning part, and by making the thickness of the annular protrusion match the thickness of the stator, it can be fixed at the same time as fixing the clutch mounting boss. This provides various effects such as making it possible to fix the child to the front housing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a schematic sectional view of a compressor, Fig. 2 is a schematic sectional view showing another embodiment, and Fig. 3 is a schematic sectional view showing a conventional embodiment. be. 3...Front housing, 5...Shaft sealing chamber, 6
...Shaft seal, 7...Clutch installation boss, 8...Screw, 12...Stator, A...Clutch device.

Claims (1)

[Scope of utility model registration request] A stator of a clutch device for driving force transmission is attached using a part of the front housing that closes the front end side of the cylinder body, and a shaft sealing chamber is formed at the shaft center of the front housing, and a shaft sealing chamber is formed in the shaft center of the front housing. In a compressor equipped with a contact ring, a clutch is formed integrally with a disk-shaped base plate having a drive shaft through hole in its shaft center and a cylindrical body that protrudes from the front surface of the base plate and holds a pulley of a clutch device. The back surface of the mounting boss on the outer peripheral side of the board is brought into contact with and fixed to the front end surface of the front housing, and the back surface of the board on the axis side is slidably contacted with the front end surface of the rotary contact ring to form a sealing surface. A compressor for vehicle air conditioning that is characterized by: