KR20040100496A - Power transmission gear for clutchless compressor - Google Patents

Abstract

PURPOSE: A power transmitting device is provided to cut off power transmission from a driving source in abnormal torque, to keep the combination of a pulley and a damper firm, and to prevent a wrong operation caused by overload of a compressor. CONSTITUTION: A pulley(20) is connected to a driving source to receive rotary power. A cover plate(40) combined to a rotary shaft(23) of a driven machine to transmit the rotary power supplied from the pulley to the rotary shaft has at least one damper(44) having at least one projection(45a,45b) protruded oppositely to the rotational direction of the pulley along the edge. A deformable member(30) installed on the upside of the pulley to place the damper has deformable units(31a,31b) supporting the projection of the damper and transmits the rotary power of the pulley to the damper. The deformable unit is strained oppositely to the rotational direction of the pulley not to support the projection of the damper for over load formed as the rotary power of the pulley rises over a predetermined value.

Description

Power transmission gear for clutchless compressor

The present invention relates to a power transmission device, and more particularly, to be used in a vehicle compressor, to mitigate starting torque generated during initial startup, and to drive a driven device such as the compressor and the driven device when the limit torque occurs. It relates to a power transmission device that can prevent damage to the drive source.

Background Art [0002] A driven device that receives rotational force from a drive source such as an engine of a vehicle or other motors has often been used as a power transmission means by which power is transmitted by attaching and detaching the clutch using the drive source and the clutch. In particular, compressors used in air conditioners of automobiles are often supplied with engine power by attaching and detaching such clutches. However, in recent years, a method of not using a clutch as the power transmission means has been proposed in recent years, which is gradually applied to an air conditioner of an automobile.

Unlike conventional clutch compressors, clutchless compressors used in vehicles do not have a clutch detachable from a drive pulley that receives the driving force of the engine, and thus the compressor shaft is always rotated by the power of the engine. It is widely used in variable capacity compressors.

The clutchless compressor always transmits power through the belt while the driving motor or the engine is being driven, and the pulley of the driving motor is rotatably supported on the outer circumferential surface of the nose part of the compressor via a bearing. The driving shaft of the compressor may be rotated by receiving the driving force of the driving motor or the engine, and receiving the rotational force of the pulley by the power transmission device from the hub connected to the driving shaft of the compressor.

In this way, the clutchless compressor receives the driving force of the engine and rotates at all times, so even when abnormal torque occurs in the engine, the abnormal torque is directly transmitted to the compressor. In this case, there is a risk that the compressor is broken. On the contrary, even when an abnormality occurs in the compressor, the abnormality is transmitted to a driving source such as the engine as it is, and there is a fear that the engine may be excessively damaged or damaged.

Therefore, in such a clutchless power transmission device, it is necessary to ensure that the driving force from the driving source is not transmitted to the driven device when the driving force of the driving source is abnormally operated or the abnormality occurs in the driven device. In the art, methods for blocking the driving source have been proposed.

1 shows a power transmission device 10 disclosed in Japanese Patent Laid-Open No. 10-299855. Referring to the drawings, the power transmission device 10 receives a rotational force from an engine and rotates a pulley 11. And a first and second hubs 12 and 13 connected to the rotating shaft of the compressor, and elastically deformable elastic members 14 coupled to connect the pulleys 11 and the first and second hubs 12 and 13. ) And a connecting mechanism comprising first and second support members 15 and 16 for supporting the elastic member 14.

In the power transmission device, when an overload such as abnormal torque is applied, the outer circumferential surface of the elastic member 14 slides with respect to the first support member 15 to block power transmission.

In addition, many designs have been developed to cut off the connection with the driving source in the power transmission device, the structure has been too complicated, and the manufacturing cost is too expensive in these previously developed power transmission device. In addition, the power transmission device does not adopt a structure that relieves this force against the starting torque generated during the initial start-up, which increases fatigue and gradually reduces the torque value that is interrupted after a long time of use. In particular, it causes a problem of shortening the life of the compressor in the vehicle air conditioner.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a power transmission device that can improve the service life by relieving starting torque generated during initial start-up.

Another object of the present invention is to provide a power transmission device that is easy to release from a driving source and has a simple structure when an abnormal torque occurs.

1 is a front view showing a conventional power transmission device,

Figure 2 is an exploded perspective view showing a power transmission device according to an embodiment of the present invention,

3a to 3c are views showing different embodiments of the damper of the present invention,

Figure 4 is a partially separated perspective view showing another embodiment of the pulley of the present invention,

Figure 5 is a front view showing a pulley of the power transmission device according to an embodiment of the present invention,

6 is a cross-sectional view of a power transmission device according to an embodiment of the present invention;

Figure 7 is an exploded perspective view showing a state after the power transmission device is modified according to an embodiment of the present invention,

8 is a cross-sectional view after deformation of the power train according to FIG. 7;

<Brief description of symbols for the main parts of the drawings>

20: pulley 22: bearing

23: rotating shaft 30: deformation member

31a and 31b: first and second deformation parts 32: slit

40: cover plate 41: hub

42: fixing plate 43: rivet

44: dampers 45a, 45b: first and second projections

46: auxiliary protrusion

In order to achieve the above object, the present invention is coupled to a drive source is supplied with a rotational force and a rotational force coupled to the rotary shaft of the driven device to transfer the rotational force supplied from the pulley to the rotary shaft, the rotation of the pulley along the edge A cover plate having at least one damper having at least one protrusion protruding in a direction opposite to the direction, a deformable portion installed on an upper surface of the pulley to seat the damper, and supporting at least the protrusion of the damper; And a deforming member for transmitting the rotational force of the pulley to the damper, and when the overload in which the rotational force of the pulley rises above a predetermined value, the deformable portion is deformed in a direction opposite to the rotational direction of the pulley, so It provides a power transmission device characterized in that it does not support.

According to another feature of the present invention, the protrusions formed on the damper may include a first protrusion and a second protrusion protruding from both side edges of the damper in a direction opposite to the rotation direction of the pulley.

According to another feature of the invention, the deformation member is formed with at least one slit can induce deformation of the deformation portion.

According to another feature of the invention, the damper may include at least one auxiliary protrusion protruding in a direction perpendicular to the rotation direction of the pulley.

According to another feature of the invention, the deformable portion is provided with a first deformable portion for supporting the protrusion and a second deformable portion for supporting the auxiliary protrusion, wherein the first deformable portion and the second deformable portion are partitioned by slits. Can be.

According to another feature of the invention, the damper may be made of an elastic body capable of elastic deformation.

According to another feature of the invention, the deforming member may be formed integrally with the pulley.

Hereinafter, a power transmission device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The power transmission device according to the present invention may be preferably used for a clutchless compressor of a vehicle air conditioner. In a preferred embodiment of the present invention to be described below, a power transmission device for a vehicle clutchless compressor may be described. Explain.

Figure 2 shows a power transmission device for a vehicle cleansing compressor according to an embodiment of the present invention.

Referring to the drawings, the power transmission device is coupled to the pulley 20 receives the rotational force from the vehicle engine, and the rotary shaft 23 of the compressor to transmit the rotational force supplied from the pulley 20 to the rotary shaft 23 And a cover plate 40 having at least one damper 44 along an edge thereof, and installed on an upper surface of the pulley 20 to allow the damper 44 to be seated so that the rotational force of the pulley 20 is increased. It includes a deforming member 30 for transmitting to the damper (44).

The pulley 20 has a bearing insertion bore 21 formed at the center thereof, and a bearing 22 is installed inside the bore 21. Then, the rotating shaft 23 of the compressor is inserted into the bearing 22 is coupled to the cover plate 40.

The pulley 20 may be provided with a plastic material or a metal material such as resin, and the bore 21 in which the bearing 22 is installed is preferably formed of a metal material such as steel.

At least one deforming member 30 is installed on the upper surface of the pulley 20 to transmit the rotational force of the pulley 20 to the cover plate 40, which will be described later.

A cover plate 40 is fixedly coupled to a distal end of the rotating shaft 23 installed through the pulley 20, and the cover plate 40 is connected to the hub 41 coaxially with the rotating shaft 23. It may be provided with a fixing plate 42 coupled to the upper surface of the hub (41). These hubs 41 and the fixing plate 42 are coupled to each other by a plurality of rivets 43.

The fixing plate 42 coupled to the upper surface of the hub 41 has a shape corresponding to that of the hub 41, and at least one damper 44 is formed along the outer circumference thereof. That is, the damper 44 is provided in plurality independently of the outer circumference of the fixing plate 42, which may be formed integrally with the fixing plate 42, or may be combined separately.

The hub 41 and the fixing plate 42 may be made of a plastic material or a metal material such as a resin, but the hub 41 and the fixing plate 42 may be formed in one body instead of being separated and riveted as described above. Of course.

On the other hand, the damper 44 is at least the outer surface is formed of an elastic material, according to a preferred embodiment of the present invention three may be installed along the edge of the fixing plate 42. Of course, the number of the damper 44 is not limited to this, it is possible to increase or decrease. In addition, the damper 44 does not necessarily need to be installed on the fixed plate 42, but may be installed on the hub 41, or may be separately provided to be coupled to a portion between the hub 41 and the fixed plate 42. Alternatively, the hub 41 and the fixed plate 42 may be integrally formed.

On the other hand, the damper 44 may be formed with at least one protrusion (45a, 45b) protruding in the direction opposite to the rotation direction (V) of the pulley 20, the rotation direction (V) of the pulley 20 At least one auxiliary protrusion 46 may be formed to protrude in a direction perpendicular to each other.

The shape of the protrusions formed on the damper 44 can be seen in more detail by FIGS. 3A to 3C.

First, as can be seen in Figure 3a, the protrusions formed on the damper 44, the first and second protrusions 45a and 45b protruding in a direction opposite to the rotational direction V of the pulley and the rotation of the pulleys. The auxiliary protrusions 46 protruding in a direction perpendicular to the direction V may be provided, and the first and second protrusions 45a and 45b protrude from both side edges of the damper 44. As described below, the first and second protrusions 45a and 45b reduce the starting torque applied when the engine is initially started, and deform the deforming member 30 of the pulley 20 when excessive torque is generated. It is a function to block the connection of the cover plate 40 and the pulley 20 connected to the compressor, as shown in Figure 3b, one projection protruding in a direction opposite to the rotational direction (V) of the pulley ( 45 '), and as shown in FIG. 3C, the first protrusion 45a "and the second protrusion 45b" protruding from both side edges, and the third protrusion 45c "protruding therebetween. Of course, the dampers 44 ′ and 44 ″ may also allow the auxiliary protrusions 46 to protrude in a direction perpendicular to the rotation direction of the pulley.

The auxiliary protrusion 46 is formed to protrude in a direction perpendicular to the rotational direction of the pulley to support a function of assisting inducing deformation generated in the deforming member of the pulley when excessive torque is generated, as shown in FIGS. 3A to 3C. As can be, according to the preferred embodiments of the present invention can be installed one by one to the outside with respect to the rotational direction of the pulley, but is not necessarily limited to this, it can be further installed in the center of rotation, that is, the inner side, the upper surface It may also be installed toward.

The protrusions of the damper 44 are supported by the deformable portion of the deforming member 30, as will be described later. As can be seen in FIGS. 3A to 3C, the deforming member in the rotational direction V of the pulley ( When 30 is rotated, the deformable portion of the deforming member 30 is pushed while supporting the protrusion of the damper 44, so that the damper also rotates in accordance with the rotational direction of the pulley. Then, the reaction force against the rotation is transmitted to the deformation part of the deformable member through the projection of the damper 44 to reduce the starting torque as described above and to connect the cover plate 40 and the pulley 20 when excessive torque occurs. Enable the blocking function.

Although not shown in the drawings, the damper 44 has a support part formed integrally with the fixing plate 42 therein, and may be formed by covering the outside of the support part with an elastic resin material. The support part may be provided to have the same shape as that of the damper 44. That is, the support portion has a structure in which protrusions are formed corresponding to the shape of the damper 44, and the support portion further increases the strength of the protrusions without forming protrusions only by the elastic resin material covering the outer surface of the support portion. To do that. Thus, by forming the support portion in the same shape as the damper 44, it is possible to more quickly and accurately shut off power when abnormal torque is generated.

Although not shown in the drawings, the structure of the damper may be manufactured in another manner. That is, as described above, the pulley and the damper without protrusions are integrally injection-molded with synthetic resin material, and the protrusions are molded, that is, secondary injection, with an elastic resin material.

As shown in FIG. 2, the deformable member 30 to which the damper 44 is seated is installed on the upper surface of the pulley 20 and at least in a direction opposite to the rotational direction of the pulley 20. Deformation portions 31a and 31b are formed to cover the side surfaces.

The deformable member 30 may be formed of a plastic or metal material such as a resin material, as shown in FIG. 2, may be integrally formed with the pulley 20, and as shown in FIG. 4, A rivet 34 may be formed on the bottom surface 33 of the deforming member 30 to be riveted to the rivet hole 23 of the pulley 20. In addition, the rivet 34 may be welded to the top surface of the pulley 20. It may be.

The deformation member 30 supports the damper 44 installed in the cover plate 40 as described above to transmit the rotational force of the pulley 20 to the cover plate 40, and at least the pulley rotation direction V of the damper 44. The first deformable portion 31a is provided to support the protrusions 45a and 45b protruding in a direction opposite to the cross-section. As shown in FIG. 5, the first deformable portion 31a is formed in a shape corresponding to the shape of the protrusions 45a and 45b formed at one end of the damper 44. The second deformable portion 31b is formed on the side of the deformable member 30 in a shape corresponding to the shape of the auxiliary protrusion 46 formed on the side surface of the damper 44 so that the auxiliary protrusion 46 of the damper 44 is formed. To support it.

The first deformable portion 31a and the second deformable portion 31b are deformed when the rotational force of the pulley 20 rises above a predetermined value, that is, when an abnormal torque is generated, so that each of the protrusions of the damper 44 may be deformed. Allow support to be released.

According to the present invention, FIGS. 2 and 5 between the first deformable portion 31a and the second deformable portion 31b to induce deformation of the first and second deformable portions 31a and 31b. As can be seen in the slits 32 were formed. When abnormal torque is generated by the slit 32, the first deformable portion 31a and the second deformable portion 31b are formed by the force of the projections 45a, 45b and the auxiliary projections 46, respectively. It is deformed in a direction opposite to the rotation direction V and in a direction perpendicular to the rotation direction V. As shown in FIG. In addition, the slit 32 can be added to an appropriate number in addition to the position where the deformation due to the force is to be induced.

The deformable member 30 as described above is installed in a number corresponding to the number of dampers 44 formed on the cover plate 40, and the deformable portions 31a, 31b and the slit 32 also have the shape of the damper 44. It can be modified in various ways.

Next, with reference to the accompanying drawings looks at the operation of the power transmission device having a structure as described above.

First, as described above, as shown in FIG. 6, the damper 44 formed on the cover plate 40 is coupled to be seated on the deforming member 30 of the pulley 20. At this time, the deformable portions 31a and 31b of the deforming member 30 may be formed to correspond to the shape of the damper 44, so that the coupling of the cover plate 40 and the pulley 20 may be more firm.

When the compressor is normally driven, the rotational force of the pulley 20 is transmitted to the damper 44 supported by the deformable portions 31a and 31b of the deformable member 30 through the deformable member 30 to cover it. The plate 40 is rotated, and eventually the rotation shaft 23 connected to the cover plate 40 is rotated. As such, the rotational force of the pulley 20 is transmitted to the rotary shaft 23 of the compressor to operate the compressor.

At this time, the starting torque of the engine, that is, when the stopped pulley 20 starts to rotate, the starting torque of the pulley 20 is transmitted to the deforming member 30 in the rotational direction V thereof, and the deforming member 30 ) Pressurizes the damper 44. This starting torque is generated when a force is applied to a stationary member and can act as an initial shock.

Reaction force is generated in the damper 44 against the pressing force of the deforming member 30 according to the starting torque in a direction opposite to the rotational direction V of the pulley 20, and this reaction force supports the damper 44 to support the compressor. The deformable member 30 for driving the deformable member 30, in particular, acts as a large force on the first deformable portion 31a. This starting torque thus increases the fatigue of the deforming member 30, in particular the first deforming section 31a, resulting in a faster deformation of the first deforming section 31a. Therefore, in order to solve the starting torque problem generated during the initial startup, at least one protrusion 45a and 45b is formed in the damper 44 in a direction opposite to the rotation direction of the pulley 20. The first deformation part 31a of the deformation member 30 supports the protrusions 45a and 45b. That is, according to the preferred embodiment of the present invention, the first deformable portion 31a of the deforming member 30 supports the first protrusion 45a and the second protrusion 45b of the damper 44 during initial startup. The reaction force with respect to the generated starting torque can be alleviated by being distributed to the first protrusion 45a and the second protrusion 45b. That is, since the damper 44 is made of an elastic member, the pressing force according to the starting torque as described above can be sufficiently relaxed by the damper 44.

Of course, the relaxation of the starting torque may also be performed by the side projections of the damper 44, that is, the auxiliary projections 46 protruding at right angles to the rotational direction of the pulley 20. In this way, the starting torque is distributed during the initial start-up by the protrusions formed in the direction opposite to the rotational direction of the pulley or the auxiliary protrusions formed in the direction perpendicular to the rotational direction of the pulley, so that the service life of the clutchless compressor can be further improved. Will be.

Next, in the case of an abnormal torque in which the rotational force of the pulley rises above a predetermined value, the rotational force of the pulley 20 should be blocked so as not to be transmitted to the rotating shaft 23 of the compressor. This is achieved by the deforming member 30 of the pulley 20 and the damper 44 of the cover plate 40, that is, the rotational speed of the pulley 20 is excessively increased, or an abnormality is generated in the compressor and the rotation shaft ( If overload 23), the compressor and the pulley 20 should be separated to prevent damage to the compressor.

First, when abnormal torque is generated, a difference in rotational force occurs between the rotational force on the pulley 20 side and the compressor rotation shaft 23. This difference in rotational force is in the circumferential direction of the pulley 20 between the deformable member 44 of the pulley 20 and the damper 44 of the cover plate 40 seated on the upper part of the deformable member 44. It acts as a deformation force of.

Accordingly, as shown in FIG. 8, the first deformable portion 31a and the second deformable portion 31b are opened around the slit 32 formed in the deforming member 30, as shown in FIG. 9. As you can see, it twists outward.

Therefore, the deforming member 30 surrounding the outer circumferential surface of the damper 44 is released from the coupling relationship with the damper 44, so that the cover plate 40 is freed in the engaged state with the deforming member 30. The connection state between the cover plate 40 and the deformable member 30 is blocked.

As a result, the rotational force transmitted from the pulley 20 is transmitted only to the deformable member 30 positioned on the upper surface of the pulley 20, and the force does not reach the damper 44 which is in contact with it. Therefore, power transmission is completely blocked by the cover plate 40 to which the damper 44 is coupled and the rotating shaft 23 of the compressor connected thereto, thereby preventing the compressor from operating anymore.

According to the present invention as described above, the following effects can be obtained.

First, the protrusions formed in the damper can alleviate the starting torque during initial start-up, thereby extending the life of driven equipment such as clutchless compressors.

Second, the power transmission can be cut off from the driving source at the time of abnormal torque with a simple structure.

Third, the number of parts can be reduced, and the production can be made more simple, thereby improving productivity.

Fourth, the combination of the pulley and the damper can be more firmly maintained.

Fifth, the power transmission of the pulley to the compressor shaft can be cut off at the set value, thereby preventing the malfunction due to the overload of the compressor in advance.

Sixth, when an abnormality occurs in the compressor, it is possible to protect the driving source by cutting off the connection with the driving source.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

A pulley connected to a driving source to receive rotational force; A cover plate having at least one damper coupled to a rotating shaft of a driven device to transmit the rotating force supplied from the pulley to the rotating shaft, and having at least one protrusion protruding along an edge in a direction opposite to the rotating direction of the pulley; ; And And a deforming member installed on an upper surface of the pulley and having a deformable portion on which the damper is seated, at least a protrusion of the damper is supported, and transmitting rotational force of the pulley to the damper. And the deformable portion is deformed in a direction opposite to the rotational direction of the pulley when the rotational force of the pulley rises above a predetermined value so as not to support the protrusion of the damper. The method of claim 1, The projection formed on the damper is a power transmission device characterized in that it comprises a first projection and a second projection protruding from both side edges of the damper in a direction opposite to the rotation direction of the pulley. The method of claim 1, At least one slit is formed in the deforming member, the power transmission device, characterized in that to induce the deformation of the deformable portion. The method of claim 1, The damper is a power transmission device characterized in that it comprises at least one auxiliary protrusion protruding in a direction perpendicular to the rotation direction of the pulley. The method of claim 4, wherein The deformable portion is provided with a first deformable portion for supporting the protrusion and a second deformable portion for supporting the auxiliary protrusion, wherein the first deformable portion and the second deformable portion are divided by a slit. . The method according to any one of claims 1 to 5, The damper is a power transmission device, characterized in that made of an elastic body capable of elastic deformation. The method according to any one of claims 1 to 5, And the deforming member is formed integrally with the pulley.