KR100303270B1 - Swinging plate compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking plate compressor, in which a driving force transmitting member is fixed to a drive shaft to rotate integrally with the drive shaft. A rocking plate is provided to the drive transmission member via the radial bearing and the thrust bearing, and the drive transmission member rotates as the drive transmission member rotates. Axial force is applied to the inner ring of the radial bearing to generate a preload on the thrust bearing.

Description

Oscillating plate compressor

The present invention relates to a rocking plate compressor.

The swing plate-type compressor includes a thrust flange fixed to the drive shaft, a drive hub provided via a hinge ball so as to be slidable to the drive shaft, and a swing plate that swings according to the rotation of the drive hub.

The swinging plate is swingably installed on the driving hub via the radial bearing and the thrust bearing to perform the swinging motion.

The thrust bearing is arranged between the swinging plate and the drive hub.

The radial bearing is assembled with the swing plate and the drive hub by press-fitting from the axial direction.

One ball part of the connecting rod is rotatably connected to the rocking plate, and the other ball part of the connecting rod is connected to the piston.

By the way, a radial clearance and an axial clearance exist in a radial bearing, and when a radial clearance and an axial clearance become large, a vibration and a noise generate | occur | produce at the time of operation of a compressor.

In order to prevent this, it is necessary to strictly manage the radial clearance of the radial bearing and the radial clearance of the prior art, and the use of high-quality radial bearing has to be used, resulting in an increase in the manufacturing cost of the swinging plate compressor. .

In addition, if the thrust bearing does not apply an initial preload to some extent, a gap is generated between the rotor and the race, so that the axial stability between the swing plate and the driving hub becomes poor, and thus acts in the axial direction during operation. The oscillating plate vibrates due to the force that causes the noise, and the compressor may be damaged.

An object of the present invention was made in view of the above circumstances, and it is possible to suppress vibration and noise generated by a bearing provided between a swing plate and a driving hub during operation, and furthermore, a swing that can increase the reliability of the bearing. It is to provide a plate compressor.

In order to solve the above-mentioned object, the rocking plate type compressor is fixed to the drive shaft, and is provided with a driving force transmitting member which rotates integrally with the two driving shafts, and through the radial bearing and the thrust bearing on the driving force transmitting member. A rocking plate type compressor having a rocking plate that oscillates with rotation of a transmission member, characterized by comprising an axial force applying means for applying a axial force to an inner race of the radial bearing to apply a preload to the thrust bearing. do.

Since preload is applied to the inner ring of the radial bearing according to the swinging plate compressor of the present invention, radial and axial clearances are maintained in the radial bearing at each small value (preferably " 0 ") or In addition to being able to control, clearance between the roller and the raceway of the thrust bearing can be prevented. Therefore, it is possible to prevent rattling between the swing plate and the driving force transmitting member due to the relaxation of the thrust bearing, and at the same time, it is possible to prevent the displacement of the press-fitting portion of the radial bearing during the operation of the compressor.

Preferably, the axial force exerted on the inner ring of the radial bearing by the axial force applying means acts on the thrust bearing via the swing plate so that preload is generated in the thrust bearing.

More preferably, the axial force applying means has a lock nut.

Since a predetermined axial force is applied to the inner ring of the radial bearing by fastening the lock nut according to the preferred embodiment, the fastening force of the lock nut can be used to control or adjust the preload on the thrust bearing.

More preferably, the axial force is greater than the pushing force applied to the radial bearing when the radial bearing is pressed between the swing plate and the driving force transmitting member.

More preferably, the drive force transmitting member has a drive hub installed on the drive shaft, the drive hub having a boss having an open end having an external male thread formed on the outer circumferential surface of the open end, and the swinging plate is provided with a boss via a radial bearing. The lock nut is screwed onto the external male thread of the open end of the boss to apply axial force to the inner ring of the radial bearing, Preload occurs in the bearing.

More preferably, the axial force applying means has a balance weight interposed between the lock nut and the inner ring of the radial bearing, wherein the lock nut exerts an axial force on the inner ring of the radial bearing via the balance weight.

For example, radial bearings are radial ball bearings.

In general, radial bearings are radial roller bearings.

For example, radial roller bearings are cylindrical roller bearings with double ribs.

For example, a radial roller bearing is a double row, four row tapered roller bearing.

For example, radial roller bearings are self-aligning roller bearings.

More preferably, the axial force applying means has a spring.

According to a preferred embodiment, since a constant axial force is always applied to the inner ring of the radial bearing, displacement of the indentation of the radial bearing is prevented from occurring during operation of the rocking plate compressor.

More preferably, the drive force transmitting member has a drive hub provided on the drive shaft, the drive hub has a boss, and the swinging plate is installed on the boss via the radial bearing, and is driven by the drive hub through the thrust bearing. Supported. The axial force applying means has a supporting means for holding a spring between the inner ring of the radial bearing and itself, which spring exerts an axial force on the inner ring of the radial bearing by spring force to generate a preload on the thrust bearing by the swing plate. Let's do it.

Very preferably, the spring is a conical disk spring.

The objects and features of the present invention will become apparent from the following description with reference to the accompanying drawings.

1 is a longitudinal sectional view showing the entire rocking plate compressor according to an embodiment of the present invention.

Figure 2 is a longitudinal sectional view showing the whole of the rocking plate compressor according to a modification of the embodiment of the present invention.

Figure 3 is a longitudinal sectional view showing the whole of the rocking plate compressor according to another variant of the embodiment of the present invention.

4A to 4C are partial sectional views showing various types of radial bearings.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described according to drawing.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing the whole of a rocking plate compressor according to an embodiment of the present invention.

The rear head 3 is fixed to one end surface of the cylinder block 1 of this rocking plate compressor via a valve plate 2, and the front head 4 is fixed to the other end surface.

In the cylinder block 1, a plurality of cylinder bores 6 are arranged in a circumferential direction around the drive shaft 5 through a predetermined circumferential direction. In each cylinder bore 6, the piston 7 is freely received with sliding.

The crank chamber 8 is formed in the front head 4, and the crank chamber 8 swings around the hinge ball 9 in association with the rotation of the shaft 5. Is housed.

In the rear head 3, a discharge chamber 12 and a suction chamber 13 positioned around the discharge chamber 12 are formed. In the discharge chamber 12, the first discharge space 12a and the second discharge space 12b are partitioned by the partition 14, and both discharge spaces 12a and 12b are limited to the partition 14. It communicates through the hole 14a.

The valve plate 2 has a refrigerant discharge port 16 for communicating between the cylinder bore 6 and the discharge space 12a and a refrigerant suction port 15 for communicating between the cylinder bore 6 and the suction chamber 13. Are formed at intervals of the number of cylinder portions, respectively.

The refrigerant discharge port 16 is opened and closed by the discharge valve 17, and the discharge valve 17 is fixed by the rivet 19 at the same time as the valve stopper 18 by the rear head side end surface of the valve plate 2. It is formed of a single member.

In addition, the refrigerant suction port 15 is opened and closed by the suction valve 21, the suction valve 21 is formed of a single member disposed between the valve plate 2 and the cylinder block (1).

In addition, the small diameter hole 22 and the large diameter hole 23 are provided in the center part of the cylinder block 1 along the center line of the cylinder block 1. The radial bearing 24 is accommodated in the small diameter hole 22, and the thrust bearing 25 is accommodated in the large diameter hole 23, respectively.

The radial bearing 24 and the thrust bearing 25 support the rear end of the drive shaft 5, and the front end of the drive shaft 5 is supported by the radial bearing 26 in the front head 4. .

Moreover, the communication block 31 which communicates the suction chamber 13 and the crank chamber 8 is set in the cylinder block 1. The pressure regulating valve 32 is provided in the middle of this communication path 31, and the pressure in the suction chamber 13 and the pressure in the crank chamber 8 are adjusted according to this pressure regulating valve 32. As shown in FIG.

The thrust flange 40 is fixed to the drive shaft 5. The drive hub 41 is provided at the inner position in the axial direction of the thrust flange 40 at the drive shaft 5 via the hinge ball 9. The thrust flange 40 and the driving hub 41 form a driving force transmission member.

The thrust flange 40 and the drive hub 41 are connected to each other by a link arm 42, and the rotation of the drive shaft 5 is driven from the thrust flange 40 through the link arm 42. 41).

A thrust bearing 33 is arranged between the thrust flange 40 and the front head 4.

The ball portion 11a of the connecting rod 11 is rotatably connected to the swinging plate 10, and the piston 7 is connected to the other side of the connecting rod 11. The piston 7 reciprocates in the cylinder bore 6 by the rocking of the rocking plate 10. The inclination angle of this rocking plate 10 changes according to the pressure of the crank chamber 8. In addition, a ball bearing (radial bearing) 27 is provided between the swinging plate 10 and the boss portion 43 of the driving hub 41 according to the press-fit. In this case, the press-fitting allowance difference between the boss portion 43 and the inner ring 27A of the ball bearing 27 (when the outer diameter of the boss portion 43 is larger than the inner diameter of the inner ring 27A, the difference between the former and the latter) And the press-fitting allowance between the outer ring 27B of the ball bearing 27 and the inner circumferential wall of the swinging plate 10 (when the inner diameter of the swinging plate 10 is slightly larger than the outer diameter of the outer ring 27B, between the former and the latter) The proper radial clearance is obtained by changing the dimensions of the inner and outer rings 27A and 27B of the ball bearing 27 generated when the ball bearing 27 is press-fitted so that the difference) is provided.

In addition, a thrust bearing 28 is provided between the swinging plate 10 and the driving hub 41.

By press-fitting the inner ring 27A of the ball bearing 27, the press-fitting condition is set so that initial thrust pressure (for example, about 70 kg / m <2>) may be made to the thrust bearing 28 via the swinging plate 10. FIG. Examples of press-fit conditions include press-in input and press-in speed holding time.

The preload of the thrust bearing 28 can be managed by measuring the rotational torque of the swinging plate 10 after the ball bearing 27 is press-fitted. That is, if there is an axial clearance (important) in the ball bearing (radial bearing) 27, the thrust bearing 28 and the oscillation plate 10 do not contact each other based on this, and the thrust bearing ( Even a very small amount of rotational torque for transmitting from the driving hub 41 to the swinging plate 10 via 28 is not obtained at all after the press-fitting.

By the way, there exists a correlation between a radial clearance gap and an axial clearance that radial clearance also becomes "0" when an axial clearance is "0". Therefore, when the rotational torque can be obtained, the radial clearance and the axial clearance of the ball bearing 27 become "0" at the same time.

Further, an external male thread 43a is provided on the outer circumferential surface of the distal end of the boss portion 43, and a lock nut 34 as an axial force-applying mean is screwed on the external male thread 43a. The balance weight 30 is attached between the lock nut 34 and the inner ring 27A of the ball bearing 27.

In addition, the lock washer 35 is interposed between the lock nut 34 and the balance weight 30 to prevent the lock nut 34 from loosening.

Further, the axial force exceeding the pressing force (preload applied to the thrust bearing 28, etc.) of the inner ring 27A of the ball bearing 27 of the drive hub 41 is greater than the tightening force of the lock nut 34 (for example, 150 kg / m 2). Degree). By adjusting the tightening force of the lock nut 34, the axial force (preload applied to the thrust bearing 28) applied to the inner ring 27A of the radial bearing 27 is controlled to control the inner axial direction and radial clearance of the ball bearing 27. Can be adjusted.

According to the said embodiment, the following effects can be exhibited.

Since the radial clearance and the axial clearance of the ball bearing 27 can be kept at "0" by the axial force exerted by the lock nut 34, the wear of the ball bearing 27 and the thrust bearing 28 can be reduced.

Since the axial force acting on the inner ring 27A can be adjusted beyond the initial preload applied to the thrust bearing 28, the preload management is performed by the fastening force of the lock nut 34, and the ball bearing ( The state where the press-fitting portion of 27 is displaced can be avoided, and occurrence of rattling of the ball bearing 27 and the thrust bearing 28 can be prevented.

In addition, since the ball bearing 27 uses a standard product, it is possible to provide a compressor at low cost.

Fig. 2 is a longitudinal sectional view showing the whole of a rocking plate compressor according to a modification of the first embodiment of the present invention, and the same parts as in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

This modification is a lock nut screwed to an external male screw formed on the outer periphery of the open end of the tip of the boss portion 43 without mounting the balance weight 30 on the boss portion 43 of the drive hub 41. 34 differs from the above embodiment in that it contacts the inner ring 27A of the ball bearing 27 via the lock washer 35.

According to this modification, the same effects as in the above embodiment can be obtained. In addition, since this modification does not attach the balance weight 30, the structure of a compressor is simplified and manufacturing cost is low.

Fig. 3 is a longitudinal sectional view showing an entire swinging plate compressor according to another modification of the first embodiment of the present invention. The same parts and elements as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted.

In this modified example, the disc spring 36 is attached to the outer circumferential surface of the tip portion of the boss portion 43 of the drive hub 41, and the inner rim of the disc spring 36 is moved to the inner ring of the ball bearing 27. The outer peripheral rim of the disc spring 36 is supported by the clip ring 38 via the ring-shaped plate 37 in contact with 27A, and is different from the above embodiment. The clip ring 38 is fixed to the outer circumferential surface of the tip portion of the boss portion 43.

According to this modification, the same effects as in the modification of FIG. 2 can be obtained.

4A to 4C are partial cross-sectional views showing specific examples of various radial bearings other than ball bearings that can be used in the present invention.

As the radial bearing, a radial roller bearing other than a radial ball bearing such as the above-described ball bearing 27 can be used.

As the radial roller bearing, a cylindrical roller bearing 50 having both ribs shown in Fig. 4A, a double roller and four rows of tapered roller bearings 60 shown in Fig. 4B, and a display shown in Fig. 4C. Automatic centering roller bearing 70 can be used.

When the rollers 51, 61, 71 are used, the contact between the inner ring 52, 62, 72 and the outer ring 53, 63, 73 is not a point like the ball bearing 27, but a line, that is, a tangent line. Withstand load In addition, it is possible to withstand a larger load by using a plurality of rows.

As described above, according to the rocking plate compressor of the present invention, the radial clearance and the axial clearance of the radial bearing can be maintained at approximately " 0 ", so that the wear of the radial bearing and the thrust bearing can be reduced, and the durability life, etc. Reliability is improved. In addition, the occurrence of vibration or noise due to the rattling of the bearing is suppressed, and the situation that the compressor is broken can be prevented.

In addition, according to the rocking plate compressor of the present invention, the axial force to the inner groove can be adjusted beyond the initial preload to the thrust bearing, so that the preload management can be performed by the tightening force of the lock nut, and thus the radial bearing and the thrust bearing. The occurrence of rattling can be prevented. Therefore, it is possible to suppress the occurrence of vibrations and noises caused by the rattling of the bearings beyond the rocking plate compressor, and to prevent damage to the compressor.

Claims (15)

A driving shaft, a driving force transmitting member fixed to the driving shaft and integrally rotating with the driving shaft, and installed on the driving force transmitting member via a radial bearing and a thrust bearing, and a swinging plate swinging as the driving force transmitting member rotates. In the rocking plate type compressor provided with: And a axial force imparting means for applying preload to the thrust bearing by applying an axial force to an inner ring of the radial bearing. The swinging force according to claim 1, wherein the axial force applied to the inner ring of the radial bearing by the axial force applying means acts on the thrust bearing via a swinging plate to give a preload to the thrust bearing. Plate compressor. The rocking plate compressor according to claim 2, wherein the axial force applying means is a lock nut. 4. The rocking plate compressor according to claim 3, wherein the axial force is greater than a pushing force applied to the radial bearing when the radial bearing is press-fitted between the rocking plate and the driving force transmitting member. The driving force transmission member of claim 4, wherein the driving force transmitting member includes a driving hub installed on the driving shaft, and the driving hub has a boss having an open end having an internal male thread formed on an outer circumferential surface of the open end, and the oscillating plate is radial. The lock nut is installed in the boss via a bearing, and the lock nut applies the axial force to the inner ring of the radial bearing so as to impart the preload to the thrust bearing by the swing plate. A swinging plate compressor characterized by being screwed into an internal male thread. The bearing force according to claim 5, wherein the axial force applying means has a balance weight inserted between the lock nut and the inner ring of the radial bearing, and the lock nut has the axial force interposed between the radial weight of the radial bearing. A rocking plate compressor, which is applied to an inner ring. The swing plate type compressor according to claim 1, wherein the radial bearing is a radial ball bearing. The swing plate type compressor of claim 1, wherein the radial bearing is a radial roller bearing. 9. A rocking plate type compressor according to claim 8, wherein the radial roller bearing is a cylindrical roller bearing having a double lip. 9. The rocking plate compressor according to claim 8, wherein the radial bearing is a double row-four row tapered roller bearing. 9. The swing plate-type compressor according to claim 8, wherein the radial roller bearing is a self-centering roller bearing. The rocking plate compressor according to claim 2, wherein the axial force applying means includes a spring. The rocking plate type compressor of claim 12, wherein the axial force is greater than a pressing force applied to the radial bearing when the radial bearing is press-fitted between the rocking plate and the driving force transmitting member. The driving force transmitting member according to claim 13, wherein the driving force transmitting member has a driving hub provided on the driving shaft, the driving hub has a boss, and the swinging plate is provided on the boss via the radial bearing. It is supported by the drive hub via the bearing, the axial force imparting means has a support means for the radial bearing to support the spring between the inner ring and itself, the spring is by the swing plate And the axial force is applied to the inner ring of the radial bearing in accordance with the spring force so that a preload is generated in the thrust bearing. 15. A rocking plate compressor according to claim 14, wherein the spring is a conical disk spring.