KR820002581Y1 - Refrigerant compressor units - Google Patents

Abstract

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Description

Freezer Compressor Unit

1 is a cross-sectional view of the refrigerator compressor of the embodiment according to the present invention.

2A-2C are cross-sectional views and front views of the wobble plate of FIG.

3A-3C are cross-sectional and front views, respectively, along the B-B line of FIG. 3A and the rear surface of the wobble plate of the first embodiment.

4 is an enlarged partial cross-sectional view of the bevel gear of FIGS. 3A-3C.

The present invention is a refrigerator compressor of the type in which a piston in a cylinder is driven by a cam rotor and reciprocated by a wobble plate driven by a nut, rather than a rotary type. It relates to the improvement of the wobble plate, in particular.

Such refrigerator compressors are well known and are useful as compressors used in automotive air conditioning systems because the device is simple and light.

In the refrigerator compressor system, since the wobble plate is connected to each piston by a piston rod, the wobble plate should be prevented from rotating in order to ensure smooth driving. Thus, the wobble plate has a bevel gear, which meshes with an opponent bevel gear that is not supported to rotate on the cylinder block. The wobble plate is supported on the inclined surface of the cam rotor through a needle thrust bearing and is supported by a ball bearing located in a ball seat formed in the bevel gear. The wobble plate thus drives around the center of the ball bearing when the cam rotor rotates and is prevented from rotating because it is engaged between the bevel gears.

In the well-known wobble plate, the wobble plate 1 is comprised by the plate 2 and the bevel gear 3 like FIG. 2a-2c. An annular flange 4 is provided on the circumferential side of the bevel gear 3, and a rectangular boss 5 in the axial direction is provided on the back side. The plate 2 has a recessed portion 6 for accommodating the bevel gear 3 and a rectangular hole 7 for accommodating the rectangular boss 5 at the bottom thereof. The wobble plate 1 inserts the bevel gear 3 into the recessed portion 6 of the plate 2 while inserting the boss 5 into the hole 7, and then the peripheral edge of the recessed portion 6. ) Is completed by allowing the annular flange 4 to fit tightly as shown in (8). Therefore, the bevel gear 3 is fixed to the plate 2 so as not to move in the axial direction, and the relative rotation between the plate 2 and the bevel gear 3 is prevented by inserting the boss 5 into the hole.

The plate 2 also has a number of ball sockets 9 arranged at an angle to receive the end balls of the piston rods.

In the known structure, the fabrication of the wobble plate is difficult because the center of the wobble deviates from the center axis of the wobble plate unless the hole 7 is formed exactly in the center of the plate 2.

Moreover, since relative rotation is prevented near the center of the wobble plate, the force for preventing relative rotation is not great. If the thickness and length of the boss 5 are increased together with the thickness of the bottom plate, the strength is increased but the weight of the wobble plate is also increased.

It is an object of the present invention to provide a refrigerator compressor in the form of a wobble plate having a simple structure and manufacturing.

Another object of the present invention is to provide a chiller compressor in the form of a wobble plate which is small in volume, low in cost, long in life, and light in operation.

A particular object of the present invention is to provide an improved wobble plate to achieve the above object.

In the refrigerator compressor according to the present invention, there is a cylinder block (cylinder block) having a cylinder arranged in a plurality of motions, a plurality of pistons are tightly fitted to slide in the cylinder, the drive shaft, the end surface is inclined cam The rotor is mounted at the end of the drive shaft. The wobble plate is located in close proximity to the inclined surface, with a first bevel gear in the center and a ball seat in the center of the bevel gear. The second bevel gear is supported on the cylinder block and has a ball seat at its center. Since the ball bearings are located in the ball seat to support the wobble plate, the wobble plate is driven around the center of the ball. The piston rod connects each piston to the wobble plate.

A feature of the present invention is that the wobble plate is composed of a ring component and a first bevel gear, the ring component having a corresponding hole and the first bevel gear being fitted into the corresponding hole and then caulking the edge around the corresponding hole It is secured to the component to prevent relative rotation or axial movement between the ring component and the bevel gears.

A plurality of axial grooves are provided on the circumferential side of the bevel gear, and these grooves are formed to be connected to the grooves between adjacent teeth of the bevel gear. The material of the ring component enters the grooves by the coking action and enters between the teeth to prevent relative rotation and axial movement between the plate and the bevel gear.

1 illustrates an embodiment of the present invention, the cylindrical housing 10 and the cylinder block 11 which is tightly fixed to the distal end of the housing 10 and the other distal end of the housing 10 Consisting of a front housing 12. Inside the housing 10, a crank chamber 13 is formed between the cylinder block 11 and the front housing 12. The cam rotor 14 disposed in the crank chamber 13 is fixedly mounted to the inner end of the drive shaft 16. The drive shaft 16 extends through the central portion of the front housing 12 and is rotatably supported by a bearing such as a needle bearing 15 in the front housing 12. The cam rotor 14 is also supported on the inner surface of the front housing 12 by a thrust needle bearing 17. In the crank chamber 13, a wobble plate 19 is located in close proximity to the inclined surface 14a of the cam rotor 14, with a thrust knit bearing 18 therebetween. The wobble plate 19 is supported on a ball bearing 21 located at the distal end of the support device 20 so that it can be driven but not rotated.

The support device 20 is composed of a body portion 20a having an axial hole 20b at one end thereof, and a bevel gear 20c at the end of the body portion, and at the center of the bevel gear 20c, a ball bearing ( There is a sheet for 21).

By inserting the body portion 20a into the central axial hole 22 of the cylinder block 11, the support device 20 is supported to slide in the axial direction in the cylinder block 11 but not to rotate. Rotation of the support device 20 is prevented by a key and a key groove (not shown). Since the coil spring 23 is disposed in the support device and the axial hole 20b and the outer end of the spring is in contact with the screw device 24 embedded in the central hole 22 of the cylinder block 11, the support device 20 is pushed toward the wobble plate 19. The bevel gear 20c portion of the support device 20 meshes with the bevel gear 25 mounted on the wobble plate 19, thereby preventing rotation of the wobble plate. Since the ball bearing 21 lies on the seat formed at the center of the bevel gear 20c and at the same time lies on the center of the bevel gear 25, the wobble plate 19 can be driven but not rotated. 21) is supported.

Several cylinders 26 are provided in the cylinder block 11, and the piston 27 is fitted so that the piston 27 can slide. Each piston 27 is connected to the wobble plate 19 by a piston rod 28. The piston rod and the piston and the piston rod and the wobble plate are connected by a ball joint.

At the outer end of the cylinder block 11, a cylinder head 31 is fixedly arranged by bolts 32, between which a gasket 29 and a valve plate assembly 30 are inserted.

The suction head 33 and the discharge chamber 34 are provided in the head 31 of the cylinder with the separating wall 311 interposed therebetween. The valve plate assembly 30 has a valve plate 35 having an inlet port 36 connecting the inlet chamber 33 and each cylinder 26 and an outlet port 37 connecting the outlet chamber 34 and the cylinder 26. ), A suction lead valve (38), a stopper plate (41) which prevents excessive deformation of the discharge lead valve (39) and the discharge lead valve (39), and a suction and discharge lead valve and a stopper. It consists of the bolt nut 40 etc. which are fixed to a board.

In the operation of the compressor described above, the drive shaft 16 is driven by a suitable drive such as an automobile engine. Since the cam rotor 14 rotates with the drive shaft, the wobble plate 19 is driven around the ball bearing 21 in accordance with the rotation of the inclined surface 14a of the cam rotor 14. When the wobble plate 19 is driven, the respective pistons 27 in the cylinder 26 are reciprocated.

Therefore, the discharge and compression of the refrigeration gas is repeatedly performed inside each cylinder. The refrigeration gas is provided on the cylinder head 31 to connect a cooling circuit connected between an inlet (not shown) and an outlet (not shown) respectively connected to the suction chamber 33 and the discharge chamber 34. Will cycle through.

The compressor shown is equipped with a lubrication system.

During the operation of the compressor, a portion of the refrigeration gas inside each cylinder passes through the crank chamber 13 as blow-by gas through a gap between the inner wall of the cylinder 26 and the piston 27. In order to return this blow-by gas to the suction chamber 33, a so-called balance hole (not shown) is formed in the cylinder block 11 to connect between the crank chamber 13 and the suction chamber 33. It penetrates through the valve plate assembly 30. Lubricant oil is contained in the crank chamber (13), and when the compressor is operated, it is agitated and brought into and out of the state to smooth the driving parts therein. Some of the presence or absence in the crank chamber flows into the suction chamber 33 with the freezing gas returning through the balance hole, and is sucked into each cylinder to smooth the gap between the piston 27 and the inner wall of the cylinder 26.

On the other hand, an oil drift plate 42 is formed on the inner wall of the housing 10, so that oil flows along the inner wall of the housing 10 toward the front housing 12, as in US Pat. No. 4,005,948 to Hiraga. The front housing 12 is provided with an oil passage 43 for connecting the crank chamber 13 at the front of the drift plate 42 and the shaft seal cavity 45 formed in the front housing 12. To allow oil to flow into the axial seal cavity (45). Inside the shaft seal cavity 45, a shaft seal assembly 44 is arranged around the drive shaft 16 penetrating therein. The drive shaft 16 is provided with an oil passage 46 connecting the cavity 45, which is the shaft seal, and the crank chamber 13. Therefore, the oil flowing along the inner surface of the housing 10 is directed into the oil passage 43 by the flow plate 42 and flows into the cavity 45 which is the shaft rod. Part of the oil is returned to the crank chamber 13 while smoothing the needle bearing 15 and the thrust needle bearing 17 supporting the drive shaft, and the other part of the oil smoothes the needle bearing 18 while the oil passage ( 46 enters the crank chamber (13).

3a-3c show a wobble plate 19 composed of, for example, a ring 19 'of aluminum alloy and a bevel gear 25' of chromium molybdenum steel. The ring is provided with a plurality of conformal ball sockets 191 'to receive the end balls of the piston rod 28 (FIG. 1), and the corresponding holes 192' in the same plane as the ball sortets. It is installed. In the bevel gear 25 ', the surface is spherically recessed so as to form a ball seat 251' at the center of the gear, and there are several axial grooves 252 'on the peripheral side of the gear. Each groove is formed so as to be connected to the grooves 255 'between adjacent teeth 253', as shown in FIG. The back of the bevel gear is flat (254 '). The hole 256 'is a hole for supplying lubricant to the ball seat 251'.

The bevel gear 25 'is fitted into the corresponding hole 192' such that the teeth 253 'are in the same direction of the ball socket 191'. The peripheral edge of the mating hole 192 'is caulked at various locations 193' corresponding to the axial groove 252 'of the bevel gear so that the material of the ring 19' is grooved 252 'like the 194'. Inside and between teeth. Thus, the bevel gear 25 'is fixed to the ring 19', and the relative axial movement and relative rotation between the bevel gear and the ring are simultaneously prevented due to the material movement by the coking operation.

If the transferred material adversely affects the engagement of the bevel gear 25 'and the bevel gear 20 (FIG. 1), the bottom surface of each groove 252' is inclined so as to make the grooves 255 like FIG. The depth of the groove 252 'is the deepest at the distal end connected to'). The transferred material is limited to the interior of the groove 252 'so that it does not extend onto the bottom surface of the groove 255'.

Thus, the bevel gear 25 'is fixed to the ring 19' without disturbing the engagement between the bevel gears. The bottom surface of the groove 252 'may be formed in a staircase structure rather than a slope.

According to the structure of the improved wobble plate, its weight is reduced as compared with the known wobble plate in which the boss of the bevel gear is fitted into the hole of the plate.

Furthermore, since the bevel gear can be simply manufactured without a boss and the ring can also be simply manufactured, the wobble plate can be simply manufactured precisely so that the center axis is aligned with the center of the ball bearing.

Since the relative rotation between the bevel gear and the ring is prevented in the circumferential portion of the bevel gear, the strength of the force to prevent the relative rotation is even greater.

The number of axial grooves formed on the circumferential surface of the bevel gear is not limited to the number measured. The greater the number, the greater the intensity. Each axial groove may be formed to extend over the entire axial length of the circumferential surface of the bevel gear or may be shortened only to the circumferential edge of the rear face.

Claims (1)

The cylinder block 11 has a plurality of cylinders 26 arranged at an equilateral angle, and in each cylinder 26, a piston 27 is fitted so as to be able to slide, and there is a drive shaft 16. The cam loader 14 mounted at one end has an inclined surface 14a at its distal end, and a first bevel gear 25 having a ball seat at its center is provided at the center of the wobble plate 19 disposed close to the inclined surface 14a. The ball seat also exists in the center of the second bevel gear 20c supported on the cylinder block 11, and the ball bearing 21 located on both ball seats has a wobble plate 19 with the ball 21. The wobble plate 19 supports a corresponding hole 192 'in a known manner, which is supported so as to be able to be driven around the center of the cylinder and the piston rod 28 connects each piston 27 to the wobble plate 19. An excitation ring 19 'and a first bevel gear 25', and the first bevel gear 25 'is a peripheral edge 193' of the corresponding hole 192 '. By modifying a mechanical refrigeration compressor unit adapted to be fixed to "(ring 19) is fitted screwing the corresponding holes 192 '.