KR20210106135A - Clutch and compressor including the same - Google Patents

Abstract

The present invention relates to a clutch and a compressor including the same. The compressor of the present invention comprises: a shaft having a first friction unit formed on the mating surface into which a clutch bolt is inserted; a pulley which receives a power from an external driving source and is axially rotationally coupled to the shaft; a disk positioned to face each other in the axial direction with the pulley and coupled to a hub which rotates together with the shaft; a spacer inserted into the clutch bolt, fixed by the clutch bolt while in surface contact with a first friction unit, and formed with a second friction unit; and a field coil assembly positioned inside the pulley and capable of relatively moving the disk toward the pulley by an electromagnetic force generated depending on whether or not the power is applied. The present embodiment is an improvement of an assembly structure of the shaft provided in the compressor.

Description

CLUTCH AND COMPRESSOR INCLUDING THE SAME

The present invention relates to a clutch and a compressor including the same, and more particularly, to a clutch and a compressor including the same for preventing a clutch bolt from loosening in a disengagement direction according to repeated ON and OFF operation of the compressor.

BACKGROUND ART In general, an air conditioning device (A/C) for heating and cooling an interior is installed in a vehicle. Such an air conditioner includes a compressor that compresses a low-temperature, low-pressure refrigerant supplied from an evaporator into a high-temperature and high-pressure refrigerant and sends it to a condenser.

There are two types of compressors: a reciprocating type for compressing a refrigerant according to a reciprocating motion of a piston, and a rotary type for performing compression while rotating. The reciprocating type includes a crank type that transmits to a plurality of pistons using a crank depending on the transmission method of the drive source, and a swash plate type that transmits to a rotating shaft with a swash plate installed. There is a scroll type using orbiting scroll and fixed scroll.

The compressor typically includes a rotation shaft that transmits rotational force to a compression mechanism for compressing a refrigerant, and includes a clutch selectively connecting and disconnecting a driving source (eg, engine) of the compressor and a rotation shaft, and receiving power from the driving source It is configured to be selectively delivered and operated.

The compressor includes a casing, a compression mechanism provided inside the casing for compressing a refrigerant, a rotary shaft for transmitting rotational force from a drive source (eg, an engine) provided outside the casing to the compression mechanism, and the drive source and the rotary shaft and a clutch for selectively connecting and disconnecting the

Referring to Korean Patent No. 10-1339809, the clutch includes a hub fastened to a rotating shaft and rotatable together with the rotating shaft, a disk fastened to the hub and rotatable together with the hub, and receiving power from a driving source to rotate. A pulley is provided.

And an elastic member for fastening the hub and the disk and applying an elastic force in a direction in which the disk moves away from the pulley while fastening the hub and the disk so that the disk is movable in a direction closer to or away from the pulley with respect to the hub. is provided

It also includes a field coil assembly that is magnetized when power is applied to move the disk toward the pulley to bring the disk into contact with the pulley.

Here, the hub, the elastic member, and the disk form a disk hub assembly, and the compressor according to this configuration operates as follows.

The pulley is rotated by receiving a driving force from the driving source, and when power is applied to the field coil assembly, the disk is moved toward the pulley by a magnetic induction force of the field coil assembly to make contact with the pulley.

As the disk and the pulley are bound, the power of the driving source is transmitted to the rotating shaft through the pulley, the disk, the elastic member and the hub.

The rotating shaft operates the compression mechanism with the received power to compress the refrigerant, and is coupled to the disk hub assembly in the axial direction.

For example, when the application of power to the field coil assembly is stopped, the suction force due to the magnetic induction of the field coil assembly is no longer generated, and the disk is moved away from the pulley by the elastic member to be spaced apart from the pulley. do.

That is, the power transmission from the driving source to the rotating shaft is stopped, the operation of the compression mechanism is stopped, and the compression of the refrigerant is stopped.

1, the rotary shaft (S) provided in the conventional compressor has a spacer (Sp) inserted in the axial direction inside the front end extending toward the hub (H), the front end of the rotary shaft (S), The inner side of the hub (H) is assembled in a state coupled to each other made of serration (serration) processing, respectively.

Since the shaft (S) and the hub (H) are coupled to each other by tooth coupling, the shaft (S) is not in a completely close coupling state, but as the shaft (S) rotates in the upward or downward direction as shown by the arrow. There was a problem with movement.

In this case, when the compressor is driven for a long time or the on or off operation is repeated, the clutch bolt (B) is loosened, and countermeasures are required.

Republic of Korea Patent Publication No. 10-1339809

The present embodiment is an improvement of the assembly structure of the shaft provided in the compressor, and an object of the present embodiment is to provide a clutch in which a friction part is formed to maximally suppress loosening of a clutch bolt fixing the shaft, and a compressor including the same.

The compressor according to the first embodiment of the present invention includes a shaft 10 having a first friction part 11 formed on a mating surface facing a clutch bolt (B); a pulley 20 that receives power from an external driving source and is axially rotatably coupled to the shaft 10; a disk 40 positioned to face each other in the axial direction with the pulley 20 and coupled to a hub 30 that rotates together with the shaft 10; a spacer (50) inserted into the clutch bolt (B), fixed by the clutch bolt (B) while in surface contact with the first friction part (11), and provided with a second friction part (51); and a field coil assembly 60 located inside the pulley 20 and allowing the disk 40 to relatively move toward the pulley 20 by electromagnetic force generated depending on whether or not power is applied. .

In the spacer 50 , the second friction part 51 is formed on a front surface and a rear surface, respectively.

The hub 30 further includes a third friction part 31 formed on a surface facing the spacer 50 .

An insertion groove 12 into which the spacer 50 is partially inserted is formed in the shaft 10 , and the first friction portion 11 is formed in the insertion groove 12 .

The shaft 10 further includes a first auxiliary friction portion 12a formed on the circumferential inner circumferential surface of the insertion groove 12 .

The spacer 50 further includes a second auxiliary friction portion 52 formed in the circumferential direction, and the second auxiliary friction portion 52 is maintained in surface contact with the first auxiliary friction portion 12a. .

The compressor according to the second embodiment of the present invention includes a shaft 100 having a first inclined portion 105 inclined at a predetermined angle on a mating surface facing the clutch bolt B; a pulley 200 that receives power from an external driving source and is axially rotatably coupled to the shaft 100; a spacer (500) inserted into the clutch bolt (B) and having a second inclined portion (504) inclined so as to be in close contact with the first inclined portion (105) and fixed by the clutch bolt (B); a disk 400 that rotates together with the shaft 100 and is coupled to a hub 300 having a third inclined portion 305 formed therein so as to be in close contact with the second inclined portion 504; and a field coil assembly 600 located inside the pulley 200 and allowing the disk 400 to relatively move toward the pulley 200 by electromagnetic force generated depending on whether or not power is applied. .

The first to third inclined portions are inclined at the same inclination angle.

A first friction part 105a is formed on the front surface of the first inclined part 105 .

In the spacer 500 , second friction parts 501 are formed on the front and rear surfaces of the second inclined part 504 , respectively.

The hub 300 further includes a third friction part 310 formed on a surface facing the spacer 500 .

A compressor according to an embodiment of the present invention includes a casing (1); a compression mechanism (2) provided inside the casing (1) and compressing the refrigerant; a shaft 10 for transmitting rotational force from a driving source provided outside the casing 1 to the compression mechanism 2; and a power transmission mechanism for selectively connecting and disconnecting the shaft (10), wherein the power transmission mechanism includes a clutch (4).

In embodiments of the present invention, a phenomenon in which the shaft provided in the compressor is loosened from the fixing bolt is prevented, so that safety according to long-term use is improved, and frictional force is maximized to improve power transmission efficiency.

According to the embodiments of the present invention, unnecessary noise generated during shaft rotation can be prevented, thereby promoting a quiet compressor operation.

1 is a view showing a coupling state of a clutch bolt, a shaft, and a spacer in a conventional compressor.
2 is a cross-sectional view illustrating a compressor according to a first embodiment of the present invention.
3 is a view illustrating a mutual coupling relationship between a shaft, a clutch bolt, and a spacer in the compressor according to the first embodiment of the present invention.
4 is an enlarged view of a shaft and a spacer in the compressor according to the first embodiment of the present invention.
5 is a view showing a modified embodiment of the shaft in the compressor according to the first embodiment of the present invention.
6 to 7 are views showing a second embodiment of the present invention.

Hereinafter, a clutch according to the present invention and a compressor including the same will be described in detail with reference to the accompanying drawings. For reference, in order to fully understand the present invention, the operational advantages of the present invention, and the object achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are only exemplified for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention are It may be implemented in various forms and is not limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention may have various changes and may have various forms, the embodiments will be illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

A clutch according to a first embodiment of the present invention will be described with reference to the drawings.

For reference, FIG. 2 is a cross-sectional view illustrating a compressor according to a first embodiment of the present invention, and FIG. 3 is a diagram illustrating a mutual coupling relationship between a shaft, a clutch bolt, and a spacer in the compressor according to the first embodiment of the present invention. 4 is an enlarged view of a shaft and a spacer in the compressor according to the first embodiment of the present invention.

2 to 4, the clutch 4 according to an embodiment of the present invention is limited to the clutch 4 that receives the power of the compressor used for compression of the refrigerant in the vehicle. The clutch 4 is coupled to the left end with respect to the compressor. For reference, in FIG. 2 , the clutch 4 is described as being located inside the pulley 20 .

To this end, the compressor according to this embodiment includes a casing 1 having an external shape, a compression mechanism 2 provided inside the casing 1 and compressing a refrigerant, and a driving source provided outside the casing 1 . It includes a shaft 10 for transmitting rotational force from (for example, an engine) to the compression mechanism 2 and a power transmission mechanism for selectively connecting and separating the drive source (not shown) and the shaft 10 .

The compression mechanism 2 includes a piston 2a provided reciprocally in the axial direction within the bore of the casing 1, and a swash plate rotating together with the shaft 10 to reciprocate the piston 2a. (2b).

The compression mechanism 2 includes an orbiting scroll (not shown) configured to include the piston 2a and the swash plate 2b, and rotated by receiving the rotational force of the shaft 10, and meshing with the orbiting scroll. It may also be possible to be configured in various ways, such as a scroll method including a fixed scroll (not shown).

One end of the shaft 10 is connected to the compression mechanism 2 , the other end extends to the left of the drawing, passes through the casing 1 and protrudes to the outside, and is coupled to the power transmission mechanism.

When power is applied, the power transmission mechanism is magnetized to connect the drive source (not shown) and the shaft 10, and when power is cut off, the power transmission mechanism is demagnetized to separate the drive source (not shown) and the shaft 10. (hereinafter referred to as a clutch) (4).

2 to 4, the clutch 4 according to the present embodiment includes a shaft 10 having a first friction part 11 formed on a mating surface facing the clutch bolt B, and an external drive source. A pulley 20 that receives power and is axially rotatably coupled to the shaft 10, and a hub 30 that is positioned to face each other in the axial direction with the pulley 20 and rotates together with the shaft 10 ), is inserted into the clutch bolt (B), is fixed by the clutch bolt (B) while in surface contact with the first friction part (11), and the second friction part (51) ) formed inside the spacer 50 and the pulley 20 , and a field coil that enables the disk 40 to move relative to the pulley 20 by electromagnetic force generated depending on whether power is applied or not. assembly 60 .

The pulley 20 is formed in an annular shape, and a driving belt (not shown) that transmits a driving force from the driving source (not shown) to the pulley 20 is wound around an outer circumferential surface of the pulley 20 , and the inner circumferential surface of the pulley 20 and the casing A bearing for rotatably supporting the pulley 20 may be interposed between the outer surfaces of (1).

The pulley 20 has a friction surface (not shown) in contact with the disk 40 formed on one side (upper surface based on the drawing), and the field coil assembly 60 on the other side (lower surface) of the pulley 20 . ) into which a receiving groove (not shown) is formed.

The disk 40 is formed as an annular disk that faces the hub 30 and is in close contact with the hub 30 and has a hole in the center of a predetermined size so that the hub 30 is located in the center.

In this embodiment, the first friction part 11 is formed on the outer end surface extending toward the disk 40 so that the shaft 10 is not loosened in the disengagement direction after the shaft 10 is assembled in the coupling direction.

The first friction part 11 is manufactured by, for example, shot blasting, but may be manufactured in another method. Since the friction surface of the first friction part 11 is formed through a predetermined roughness process, when assembled with the clutch bolt B, the friction force is increased, and the clutch bolt B is loosened by repeated operation according to the on-off operation of the compressor. can prevent

The spacer 50 is in surface contact with the first friction part 11 and is in close contact with the opposite surface of the shaft 10 by the clutch bolt B. The spacer 50 also has a second friction part 51 . The frictional force is increased when assembled by the clutch bolt (B) in a state in which it is closely fixed to the first friction part (11).

In this case, even when a rotational repulsive force is applied to the clutch bolt B in the disengagement direction (refer to FIG. 5 ), the rotational repulsive force of the shaft 10 is reduced by the frictional force with the spacer 50 to minimize the loosening phenomenon.

The spacer 50 may have a second friction part 51 formed on the front and rear surfaces, respectively, and friction is generated with the inner surface of the shaft 10 and the hub 30, so that stability and fixed state according to the coupling remains unchanged.

The hub 30 has a third friction part 31 formed on its opposite surface to improve frictional force with the spacer 50 , so that it is strong when in surface contact with the second friction part 51 formed on the spacer 50 . Frictional force is maintained so that even when a strong rotational repulsive force is applied to the clutch bolt (B) in the direction of disengagement, the initially assembled state is stably maintained.

Accordingly, the frictional force between the shaft 10 and the spacer 50 and the frictional force between the spacer 50 and the hub 30 are stably maintained, thereby preventing the clutch bolt B from loosening in the disengagement direction.

5, in this embodiment, an insertion groove 12 is formed at the distal end of the shaft 10 extended to form a disk 40, and a spacer 50 is partially inserted into the insertion groove 12. do. The insertion groove 12 has a depth shorter than the thickness of the spacer 50 and is assembled by the clutch bolt B with the spacer 50 partially inserted at the axial end of the shaft 10 . .

The spacer 50 may be assembled in a state of surface contact with the front end of the shaft 10 as described above, but in this embodiment, it is inserted into the insertion groove 12 in order to increase the surface contact area and further improve the coupling stability. The spacer 50 is partially inserted.

In the insertion groove 12 , a first friction portion 11 is formed on a mating surface facing the spacer 50 in the axial direction, and a first auxiliary friction portion 12a is formed on an inner circumferential surface in the circumferential direction.

The first auxiliary friction portion 12a is formed to generate additional frictional force together with the first friction portion 11, and is formed in the circumferential direction of the insertion groove 12 to prevent stable rotational force of the shaft 10 and unnecessary noise generation. can be prevented

In addition, in this embodiment, the axial end of the shaft 10 is a friction force generated by surface contact between the first friction part 11 and the spacer 50, and the circumferential direction of the shaft 10 is the first auxiliary friction part ( 12a) and the friction force generated by the surface contact between the spacer 50, shaking and loosening of the clutch bolt B can be prevented at the same time.

When the spacer 50 according to this embodiment is inserted into the insertion groove 12 in a state in which the second auxiliary friction portion 52 is formed in the circumferential direction and in surface contact with the first auxiliary friction portion 12a described above, It is possible to prevent loosening of the clutch bolt (B) even when a rotational repulsive force is applied in the disengagement direction.

Accordingly, the clutch bolt (B) is stably maintained in the initially coupled state, and by preventing the occurrence of malfunction of the compressor due to loosening, it is possible to maintain constant operation stability even during long-term use.

The field coil assembly 60 improves the performance of the magnetic field under the condition that the diameter of the pulley 20 is not increased to improve the transmission torque transmitted to the compressor, so that the magnetic field in the radial direction is not weakened. It can increase suction power.

The field coil assembly 60 is magnetized when power is applied to bring the disk 40 and the hub 30 into contact with the pulley 20 .

Since the magnetic field generated by the field coil assembly 60 is uniformly distributed in the radial direction, the suction force with respect to the disk 40 is improved. Accordingly, even when the same current is applied in the field coil assembly 60, a uniform magnetic field distribution in the inner radial direction is maintained.

A compressor according to a second embodiment of the present invention will be described with reference to the drawings.

2 to 3 or 6 to 7, in this embodiment, the shaft 100 is formed with the first inclined portion 105 inclined at a predetermined angle to the opposite surface facing the clutch bolt (B). ) and a pulley 200 that receives power from an external driving source and is axially rotatably coupled to the shaft 100 , is inserted into the clutch bolt B, and is in close contact with the first inclined portion 105 . A spacer 500 (see FIG. 3 ) in which a second inclined portion 504 is formed and fixed by the clutch bolt B, and the second inclined portion 504 rotated together with the shaft 100 The disk 400 is coupled to the hub 300 having a third inclined portion 305 formed therein so as to be in close contact with the disk 400 and the pulley 200 is located inside the disk, and the disk is located inside the disk by electromagnetic force generated depending on whether power is applied or not. and a field coil assembly 600 that enables relative movement of 400 toward the pulley 200 .

In this embodiment, unlike the first embodiment described above, the first inclined portion 105 is formed to be inclined at a predetermined angle on the outer surface of the distal end so that the clutch bolt B is not loosened in the disengagement direction. In addition, the spacer 500 coupled to each other with the clutch bolt B, and the inside of the hub 300 are also inclined together, so that the shaft 100 and the shaft 100 according to the coupling of the teeth formed on the hub 300, respectively. Unnecessary movement in the upper and lower directions of the axial direction is not generated, and the coupled state is stably maintained.

Since the first to third inclined portions 105 , 504 and 305 are inclined at the same inclination angle, the shaft 100 , the spacer 500 , and the hub 300 are in close contact when assembled with each other by the disk bolt B. The state is stably maintained, and it is assembled so that unnecessary movement itself cannot be generated in the upper and lower axial directions of the shaft 100 .

Since the first to third inclined portions 105 , 504 , and 305 are inclined at a predetermined angle with respect to the fastening direction of the clutch bolt B, when the clutch bolt B is coupled in the axial direction of the shaft 100 , The movement in the axial direction of the shaft 100 is stably maintained, and unnecessary movement in the vertical direction is also regulated at the same time.

A first friction part 105a is formed on the front surface of the first inclined part 105 according to the present embodiment, and the spacer 500 in close contact with the first inclined part 105 is also attached to the second inclined part 500 . When the second friction parts 501 are formed and assembled in close contact with each other, the axial rotational force of the shaft 100 is stably maintained, and the rotational repulsive force according to the on or off operation of the compressor is applied to the first and second friction parts 105a. , 501) to prevent loosening and unnecessary movement in the disengagement direction at the same time.

In the spacer 500 , a second friction part 501 may be formed on a front surface and a rear surface of the second inclined part 504 , respectively. In this case, when the spacer 500 is closely assembled to the inside of the hub 300 by the clutch bolt B, frictional force is improved, thereby preventing loosening of the clutch bolt B and stably operating the compressor.

In the hub 300 according to the present embodiment, a third friction part 310 is formed on a surface facing the spacer 500 , and the third friction part 310 is formed on the second friction part 501 with each other. When assembled in a state in which the two are in surface contact, the frictional force is improved to prevent loosening of the clutch bolt (B) and to promote the stable operation of the compressor.

The first to third friction parts 105a , 501 , and 310 are manufactured by, for example, shot blast processing, but may be manufactured in another method.

The compressor can reduce the amplitude due to the vibration transmitted in the axial direction to the maximum when the clutch 4 is combined in the above-described configuration, so that the amplitude reduction effect is improved, and it can be used in combination with a compressor provided in the vehicle.

In the above, an embodiment of the present invention has been described, but those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. The present invention may be variously modified and changed by, etc., and this will also be included within the scope of the present invention.

1: casing
2: Compression mechanism
3: axis of rotation
4: Clutch
B: Clutch bolt
10, 100: shaft
11, 105a: first friction part
20, 200: pulley
30, 300: Hub
31, 310: third friction part
40, 400 : disk
50, 500: spacer
51, 501: second friction part
60, 600: field coil assembly

Claims (12)

a shaft having a first friction part formed on a surface facing the clutch bolt;
a pulley that receives power from an external driving source and is axially rotatably coupled to the shaft;
a disk positioned to face each other in an axial direction with the pulley and coupled to a hub that rotates together with the shaft;
a spacer inserted into the clutch bolt, fixed by the clutch bolt while in surface contact with the first friction part, and formed with a second friction part; and
and a field coil assembly positioned inside the pulley and configured to relatively move the disk toward the pulley by electromagnetic force generated depending on whether or not power is applied. According to claim 1,
The spacer is a compressor in which the second friction portion is formed on a front surface and a rear surface, respectively. According to claim 1,
The hub further includes a third friction part formed on a surface facing the spacer. According to claim 1,
An insertion groove into which the spacer is partially inserted is formed in the shaft, and the first friction portion is formed in the insertion groove. 5. The method of claim 4,
The shaft further includes a first auxiliary friction portion formed on the inner circumferential surface of the insertion groove. 6. The method of claim 5,
The spacer further includes a second auxiliary friction portion formed in a circumferential direction, and the second auxiliary friction portion is maintained in surface contact with the first auxiliary friction portion. a shaft having a first inclined portion inclined at a predetermined angle on a mating surface facing the clutch bolt;
a pulley that receives power from an external driving source and is axially rotatably coupled to the shaft;
a spacer inserted into the clutch bolt and formed with a second inclined portion inclined to be in close contact with the first inclined portion and fixed by the clutch bolt;
a disk rotating together with the shaft and coupled to a hub having a third inclined portion formed therein so as to be in close contact with the second inclined portion; and
and a field coil assembly positioned inside the pulley and configured to relatively move the disk toward the pulley by electromagnetic force generated depending on whether or not power is applied. 8. The method of claim 7,
The first to third inclined portions are inclined at the same inclination angle. 8. The method of claim 7,
A compressor in which a first friction part is formed on a front surface of the first inclined part. 10. The method of claim 9,
The spacer is a compressor in which a second friction portion is formed on a front surface and a rear surface of the second inclined portion, respectively. 10. The method of claim 9,
The hub further includes a third friction part formed on a surface facing the spacer. casing;
a compression mechanism provided in the casing and compressing the refrigerant;
a rotation shaft for transmitting rotational force from a driving source provided outside the casing to the compression mechanism; and
and a power transmission mechanism for selectively connecting and disconnecting the rotation shaft, wherein the power transmission mechanism includes the clutch according to any one of claims 1 to 11.

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