KR20040005282A - Power transmission apparatus for clutchless compressor - Google Patents

Abstract

PURPOSE: A power transmission apparatus for a clutchless compressor is provided to continuously rotate a pulley by breaking down some parts of a coupling damper and cutting off a power transmitting path when abnormal torque is generated at a compressor and accordingly to protect a driving source and expand the life span of the compressor. CONSTITUTION: A power transmission apparatus for a clutchless compressor(10) is composed of a pulley(30), a hub(60), a supporting plate(70), and a plurality of coupling dampers(40). The pulley is formed with a plurality of through-holes(31) at the side and rotatively combined to a compressor housing(20). The hub is combined with a driving shaft(11) withdrew through the compressor housing and arranged with a plurality of projections at the circumference. The supporting plate includes a plurality of through-holes(71) corresponding to through-holes of the pulley at the front and a combining hole in which the projection of the hub is inserted, and the supporting plate is closely contacted and combined to the front side of the pulley with the hub. The plurality of coupling dampers are combined through through-holes of the supporting plate and the pulley to connect the supporting plate to the pulley.

Description

Power transmission device for clutchless compressors {POWER TRANSMISSION APPARATUS FOR CLUTCHLESS COMPRESSOR}

The present invention relates to a power transmission device for a clutchless compressor. More particularly, the present invention relates to a power transmission device for a clutchless compressor, and more particularly, a function of cushioning during power transmission from a driving source to a compressor in a vehicle, as well as cutting off power between the driving source and the compressor when abnormal torque occurs in the compressor. It relates to a power transmission device for a clutchless compressor having a.

In general, the cooling system is to maintain a low temperature inside the vehicle by the cycle of refrigerant evaporation, compression, condensation, expansion, evaporator, compressor, condenser, expansion valve is essential to the vehicle to enable such a cooling system. And the compressor is driven by the power transmitted by the belt from the drive source of the vehicle (drive motor in the case of electric vehicles).

As an example of the said compressor, what is disclosed by Unexamined-Japanese-Patent No. 2000-161383 is known.

This compressor is a clutchless compressor, as shown in FIGS. 1 and 2, a housing (H) in which a cylindrical protrusion (A) protrudes to one side so as to penetrate the drive shaft (B) of the compressor, and, for example, a driving motor. It is provided with a power transmission device for transmitting the power from the drive source such as to the drive shaft (B) to rotate the drive shaft (B).

The power transmission device has an inner cylindrical portion (1a) rotatably coupled to the cylindrical projection (A) via a bearing (2) and an outer cylindrical portion (1b) having a pulley groove formed on an outer circumferential surface thereof. The pulley 1 receives power from a drive source through a belt (not shown) installed in the portion 1b, and is fitted to the end of the drive shaft B to be coupled to the outside, and the outer flange 4a is supported by the support member 5. And a hub 4 connected to the rivet.

The front surface of the pulley 1 is integrally formed with a plurality of locking portions 1f vertically projected outward at equal intervals in the circumferential direction.

The support member 5 is joined to the front of the outer flange 4a of the hub 4 by a plurality of rivets and fixed to the rotary shaft B of the compressor together with the hub 4 by means of connecting bolts passing through the center of rotation. It is fixed. Therefore, when this rotating shaft B rotates, the hub 4 and the supporting member 5 connected thereto rotate together.

In addition, an elastic member 6 is coupled to the rear side of the support member 5, and for this purpose, a coupling protrusion 6a radially formed on the front surface of the elastic member 6 is pressed into the support member 5. A plurality of fastening holes 5a that can be fastened are radially penetrated. In addition, in the circumferential direction in which the fastening hole 5a is formed, a relief portion 5b formed of “U” shaped notch grooves is formed between the fastening hole 5a and the fastening hole 5a at equal intervals. The elastic member 6 is deformed into the relief portion 5b.

The elastic member 6 is an annular member made of a synthetic resin material, and a contact surface 6b is formed on the rear surface thereof in contact with the protrusion 1f of the pulley 1. A plurality of elastic support portions 6c protruding perpendicular to the contact surface 6b are formed, and the elastic support portions 6c are elastically deformed so that they can be elastically deformed by the engaging portion 1f of the pulley 1. It is preferable to arrange in 5b).

Looking at the operating state of the clutchless compressor assembled in such a configuration as follows.

When the torque within the set value acts on the compressor side, the rotational force of the pulley 1 transmitted from the driving source is the engaging portion 1f, the contact surface 6b of the elastic member 6, the elastic support portion 6c, and the supporting member 5 And, it is transmitted to the power shaft (B) of the compressor through the hub (4) to rotate the drive shaft (B).

When the drive shaft B rotates, the elastic support portion 6c of the elastic member 6 connected to the hub 4 by the torque on the compressor side pushes against the locking portion 1f of the pulley 1, and the relief portion 5b. The shock on the compressor side is alleviated because it deforms elastically into the inside of the fan) to act as a buffer.

On the other hand, when a torque greater than or equal to the set value is applied to the compressor, the elastic support 6c comes into contact with the engaging portion 1f of the rotating pulley 1, and the elastic support 6c receives a torque exceeding the elastic limit. Since it is broken, the power transmission path from the pulley 1 to the power shaft B is broken, thereby preventing damage to the drive source and the compressor.

However, in the above-described conventional power transmission device, the elastic member 6 which rotates at a high speed is not sufficiently adhered to the support member 5 by centrifugal force or is not completely adhered to the support member 5 in the mounting process, thereby rotating Excessive contact between the engaging portion 1f of the pulley 1 and the contact surface 6b of the elastic member 6 may cause collision noise or prevent smooth rotation of the pulley 1. In addition, the elastic member 6 may be lifted from the contact surface with the support member 5 while being deformed by contact with heat or oil for a long time, or the state of the contact surface 6b may be uneven. . Accordingly, during operation, collision noise between the protrusion 1f of the pulley 1 and the elastic member 6 is generated or the pulley 1 does not rotate smoothly. In addition, if this phenomenon persists, the rotation of the pulley 1 is disturbed and the belt slips or the rotational force is not smoothly transmitted to the compressor, thereby shortening the life of the driving source and the compressor, and reducing cooling performance. It will cause serious problems.

In addition, when replacing the damaged elastic member 6, the hassle to separate the support member 5 from the drive shaft (B) is followed, the elastic member 6 in the process of reassembling the support member 5 ) Is not sufficiently press-fitted, which causes the above-mentioned problem.

The present invention has been made to solve the above problems, to mitigate the impact from the pulley to the compressor and to prevent damage to the drive source and the compressor, of course, the pulley rotates smoothly without interference with the peripheral member, maintenance It is to provide a power transmission device for a simple clutchless compressor.

1 is a plan view of a portion of a conventional power transmission device for a clutchless compressor broken;

2 is a cross-sectional view taken along the line II-II of FIG.

Figure 3 is an exploded perspective view of the power transmission device for a clutchless compressor according to the present invention.

Figure 4 is a cross-sectional view showing a state in which the power transmission device for a clutchless compressor according to the present invention coupled to the compressor.

Figure 5 is a detailed view showing a coupling damper of the power transmission device for a clutchless compressor according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10 ... Compressor 11 ... Drive Shaft

Compressor housing 21, 32 Boss part

30 ... pulley 31, 71 ... through

40 ... Coupling damper 41 ... Horizontal

42.Protrusion 50.Bearing

60.Hub 61.Turning

70 ... support plate 72 ... fastener

As a technical configuration for achieving the above object, a power transmission device for a clutchless compressor according to the present invention, having a plurality of through holes on one side rotatably coupled to the compressor housing; A hub coupled to the drive shaft drawn out through the compressor housing and having a plurality of protrusions formed on an outer circumference thereof; A support plate having a plurality of through holes corresponding to the through holes of the pulleys on the front surface thereof, wherein the protrusions of the hubs are fitted into the inner fastening holes to be tightly coupled to the front of the pulleys together with the hubs; And a plurality of coupling dampers coupled through the through hole of the support plate and the through hole of the pulley to connect the support plate to the pulley.

In addition, the coupling damper has at least one protrusion formed on a rear surface thereof and inserted into a through hole of the support plate and a through hole of the pulley. Therefore, when a torque exceeding a predetermined value occurs in the compressor, the protrusion of the coupling damper is broken, so that power transmission from the pulley to the compressor is blocked, thereby protecting the driving source and the compressor.

In addition, the hub and the support plate may be integrally molded.

In addition, the hub, coupling damper, and support plate may all be integrally molded.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted to mean meanings and concepts.

3 and 4, the power transmission device for a clutchless compressor according to the present invention has a plurality of through-holes 31 on one side rotatably installed in the compressor housing 20 rotatably (30) And a hub 60 coupled with the compressor drive shaft 11 drawn out through the compressor housing 20, and a plurality of through holes 71 corresponding to the through holes 31 of the pulley 30 are formed on the front surface thereof. Meanwhile, the support plate 70 is tightly coupled to the front surface of the pulley 31 while the hub 60 is fitted in the inner fastening hole 72, and the through hole is connected to the pulley 30. It consists of a plurality of coupling dampers 40 having at least one protrusion 42 inserted into 72, 31.

The pulley 30 has a boss portion 32 rotatably coupled to the boss portion 21 of the compressor housing 20 via a bearing 50 to transmit power from a driving source through a belt (not shown). By having a receiving structure, it can be seen that the structure is the same except that a plurality of through-holes 31 are formed uniformly radially along the same circumference along the same circumference in the pulley in comparison with the prior art pulley described above. have. The through holes 31 may be formed in two rows inward and outward and disposed radially.

At one end of the drive shaft 11 drawn out from the boss portion 21 of the compressor housing 20, a hub 60 having a plurality of protrusions 61 formed on an outer circumferential surface is splined to the outside of the hub 60. The support plate 70 is formed in the center is a fastening hole 72 is coupled to the protrusions 61 of the hub 60 on the inner circumferential surface is coupled.

The support plate 70 is formed with a plurality of through holes 71 corresponding to the through holes 31 of the pulley 30 along a predetermined concentric circle. When the through holes 31 of the pulley 30 are formed in two rows of inner / outer sides, the through holes 71 of the support plate 70 may also be formed in two rows.

In order to transfer the rotational force of the pulley 30 to the compressor 10, the support plate 70 and the pulley 30 are connected to each other by a plurality of coupling dampers 40.

As illustrated in FIG. 5, the coupling damper 40 has a horizontal portion 41 and a protrusion 42 formed perpendicular to one surface of the horizontal portion 41. When the through holes 31 and 71 are formed in two rows, the protrusions 42 are formed in pairs. That is, the protrusion 42 is inserted into the through hole 71 of the support plate and the through hole 31 of the pulley 30 so that the support plate 70 may be connected to the pulley 30, and in this state, the horizontal portion ( 41 is supported while contacting the front surface of the support plate 70. Therefore, in normal times, the impact of the torque transmitted from the pulley 30 functions to relax the protrusion 42 of the coupling damper 40 while elastically deforming and then transfer the shock to the hub 60. In addition, the coupling damper 40 is not only connected to the pulley 30 and the support plate 70 at the same time, it is preferably made of a rubber which is an elastic body to play a buffer role.

On the other hand, during the manufacture of the support plate 70, the coupling damper 40 is composed of a material such as, for example, NRB, EPDM, THERMOPLASTIC RUBBR, and then inserts the hub 60 to the support plate 70 by a method of double injection. ) And the hub 60 and the coupling damper 40 are preferably manufactured to be integrally molded. Alternatively, the support plate 70 and the hub 60 may be manufactured to be integrally molded. When the support plate 70 and the hub 60 and the coupling damper 40 or the support plate 70 and the hub 60 are integrally formed as described above, the hub 60 and the coupler are connected to the pulley 30. Since the ring damper 40 can be more easily coupled, the assembly can be simplified and the productivity can be improved.

In addition, the pulley 30 is preferably manufactured by aluminum die casting. When configured as described above, the light weight of the pulley 30 can be achieved and can be recycled and the life of the pulley 30 can be improved according to the improvement of corrosion resistance.

On the other hand, when a torque greater than the set value occurs in the compressor 10 and the compressor 10 is fixed, stress is concentrated on the protrusion 42 of the coupling damper 40 coupled with the through hole 31 of the pulley 30. It is broken immediately. Therefore, the driving force and the compressor 10 may be protected by blocking the rotational force of the pulley 30 from being transmitted to the drive shaft 11 of the compressor 10.

Referring to the operation of the power transmission device for a clutchless compressor according to the present invention having such a configuration as follows.

First, referring to the process in which the compressor is operated, when the driver turns on the vehicle, the driving source is operated, and the pulley 30 connected to the driving source by the belt is rotated accordingly. The coupling damper 40 coupled to the pulley 30 is also rotated together, and the support plate 70 connected to the coupling damper 40 is also rotated together. Accordingly, as the hub 60 coupled to the support plate 70 rotates and the drive shaft 11 of the compressor 10 coupled to the hub 60 rotates, cooling of the vehicle is performed by circulation of the refrigerant cycle.

In the above case, the torque applied to the compressor 10 shows a normal operating state which is lower than or equal to a set value. When the driver turns on the engine, the pulley 30 receives a sudden torque from the driving source in a stopped state and rotates. In addition, the protrusion 42 of the coupling damper 40 coupled to the pulley 30 is pushed in the rotational direction, and the protrusion 42 is elastically deformed instantaneously by this force. This series of operations causes a sudden loss of power from the drive source to the compressor 10 and at the same time delays the operating time to prevent sudden interlocking rotation of the hub 60, thereby reducing the compressor (from the pulley 30). 10) Rapid power transfer to the front is prevented. Thereafter, while the normal torque is transmitted from the driving source, the coupling damper 40 is restored to its original state by its own elastic force and starts to rotate together with the pulley 30.

In this way, the sudden impact from the pulley 30 to the compressor 10 can be alleviated, thereby preventing damage to the compressor 10 due to a rapid change in rotation from the driving source, thereby extending the life of the compressor 10.

However, when the torque applied to the compressor 10 is greater than or equal to the set value, the coupling dampers 40 are broken due to the load being concentrated on the protrusion 42 while leaving the elastic limit value. Therefore, since the rotational force of the pulley 30 is not transmitted to the drive shaft 11 of the compressor 10 while the connection between the pulley 30 and the support plate 70 is disconnected, the driving source and the compressor 10 are protected and the compressor 10 Its life is extended.

According to the present invention, since the coupling damper 40 couples the support plate 70 to the pulley 30 only by the protrusion 42, the contact area with the pulley 30 can be minimized. Therefore, as in the case of the conventional power transmission device, the belt may slip or crash noise due to abnormal rotation of the pulley 30 due to uneven contact caused by deformation of the contacting member due to changes in the surrounding environment. Can be.

In addition, when maintenance for remounting the coupling damper 40 is necessary for the same reason as described above, the through-hole of the coupling damper 40 passes through the protrusion 42 of the coupling damper 40 without disassembling the related component. Refitting of the coupling damper 40 is completed only by inserting it into (31, 71), so it is very easy to maintain.

According to the power transmission structure for the clutchless compressor of the present invention configured as described above, when a torque higher than the set value occurs on the compressor side, a portion of the coupling damper is broken to block the power transmission path, thereby transmitting the rotational force of the pulley to the compressor drive shaft. As a result, the driving source and the compressor are protected and the life of the compressor is long.

In addition, since the coupling damper connects the pulley and the support plate with only the minimum contact portion by the protrusion, the belt slip phenomenon caused by abnormal contact with the pulley due to the change of the surrounding environment, the collision noise, the shortening of the driving source and the compressor, etc. Serious quality problems are solved at once.

In addition, in the case of replacing the coupling damper, it is very easy to maintain because it only needs to be inserted and fastened from the outside front of the support plate without disassembling the related parts.

While the invention has been shown and described with respect to specific embodiments thereof, it will be understood that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It should be included in the scope of the invention.

Claims (4)

A pulley 30 rotatably coupled to the compressor housing 20 having a plurality of through holes 31 on one side thereof; A hub 60 coupled with the drive shaft 11 drawn out through the compressor housing and having a plurality of protrusions 61 formed on an outer circumference thereof; A support plate 70 having a plurality of through holes 71 corresponding to the through holes of the pulley on the front surface thereof, while the protrusions of the hub are fitted into the inner fastening holes 72 to be tightly coupled to the front of the pulley together with the hub; And, And a plurality of coupling dampers (40) coupled through the through holes of the support plate and the through holes of the pulleys to connect the support plates to the pulleys. The method of claim 1, The coupling damper 40 has at least one protrusion 42 formed on the rear surface thereof and inserted into the through hole 71 of the support plate 70 and the through hole 31 of the pulley 30. The projecting portion is a power transmission device for a clutchless compressor, characterized in that the torque is broken when a torque higher than the set value occurs in the compressor (10). The method according to claim 1 or 2, The hub (60), the coupling damper (40) and the support plate 70 is a power transmission device for a clutchless compressor, characterized in that integrally molded. The method according to claim 1 or 2, The hub (60) and the support plate (70) is a power transmission device for a clutchless compressor, characterized in that integrally molded.