KR100988042B1 - The Structure of Pulley for Automobile - Google Patents

Abstract

Pulley structure for automobiles according to the present invention is a pulley for automobile coupled to the V-belt for transmitting the driving force of the engine, including a pulley body formed in the circular hollow portion concentric with the rotating shaft and a disc coupled to the hollow portion The pulley body is composed of a plurality of fan-shaped pieces, each of the pieces is characterized in that the outer diameter of the pulley body can be moved in the direction of increasing the outer surface of the disc.

Pulley structure for automobile according to the present invention comprises a pulley body composed of a plurality of pieces and a disk coupled to the plurality of pieces constitute a pulley, each piece of the pulley by the centrifugal force generated by the rotation of the pulley By allowing the outer diameter to be moved in an increasing direction, the tension reduction of the V-belt can be compensated for without installing an expensive device additionally.

Pulley, V-belt, tension

Description

Structure of Pulley for Automobile}

The present invention relates to a pulley structure for an automobile, and more particularly, when the tension of the V-belt coupled to the automotive pulley is reduced, the outer diameter of the pulley is increased by centrifugal force due to the rotation of the pulley, thereby reducing the tension of the V-belt. The present invention relates to a vehicle pulley structure that can be compensated for.

In general, the driving force generated from the engine of a vehicle is used as a power source for driving various auxiliary devices in addition to driving forward or backward driving by rotating the wheels. As an auxiliary device using the driving power of the engine as a power source, an alternator , Water pump, air conditioner compressor and oil pump.

Such auxiliary devices are usually operated by receiving the driving force of the engine via a V-belt. For this purpose, the auxiliary devices are provided with a driven pulley interlocked with the crankshaft pulley of the engine and the V-belt, respectively.

However, the V-belt gradually decreases in tension as the engine operation time increases, and the decrease in the tension of the V-belt causes the V-belt to slip from the contact surface with the pulley, thereby inhibiting the smooth operation of the auxiliary devices. Of course, the vehicle generates noise and vibration.

In order to prevent this, in recent years, the development of a vehicle applying an auto tensioner for automatically compensating for the tension reduction of the V-belt has been actively progressed, and the automobile to which the auto tensioner is applied is described in detail in the following [Document 1].

However, since the auto tensioner itself is an expensive device, there is a problem that the production cost of the vehicle is significantly increased when it is applied, and when the length of the V-belt increases as the type of auxiliary device increases, the number of auto This problem is exacerbated by the need to install a tensioner.

In addition, in recent years, as the configuration of the engine room gradually becomes compact, additional installation of the auto tensioner further increases the assembly time of the vehicle due to the limitation of the installation space, and as a result, the yield of the production line is significantly reduced. It also causes problems.

[Document 1] Republic of Korea Patent Publication No. 2004-33879 (published April 28, 2004)

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to use an expensive auto-tensioner as in the prior art to compensate for the decrease in the tension of the V-belt transmitting the driving force of the engine. Instead, by using the centrifugal force generated by the rotation of the pulley to increase the outer diameter of the pulley, it is possible to reduce the manufacturing cost of the vehicle compared to the prior art equipped with an auto tensioner for automobiles that can improve the yield of the production line To provide a pulley structure.

In order to achieve the above object, the pulley structure for automobiles according to the present invention is a pulley for automobiles coupled to a V-belt for transmitting a driving force of an engine. It includes a combined disk, wherein the pulley body is composed of a plurality of fan-shaped pieces, each of the pieces is characterized in that the outer diameter of the pulley body can be moved in the direction of increasing the outer surface of the disk.

In addition, an opening in which the disc is inserted is formed in the hollow part formed in each piece, and a plurality of grooves spaced in the circumferential direction are formed in the inner face of the hollow part, and each piece is provided in the outer face of the disc. A plurality of projections are formed to fit with the plurality of grooves, each piece is characterized in that the movement along the grooves and projections.

In addition, in order to prevent the respective pieces from moving in a direction in which the outer diameter of the pulley body is reduced, the grooves and the projections are characterized in that they are formed in a sawtooth shape.

In addition, the number of grooves formed in each of the pieces is characterized in that more than the number of protrusions formed in the corresponding position.

Further, in order to prevent the respective pieces from being separated from the discs, the opening side of the hollow portion formed in each of the pieces is characterized in that a straight portion having a thickness smaller than the disc thickness of the protruding portion is formed.

Pulley structure for automobile according to the present invention comprises a pulley body composed of a plurality of pieces and a disk coupled to the plurality of pieces constitute a pulley, each piece of the pulley by the centrifugal force generated by the rotation of the pulley By allowing the outer diameter to be moved in an increasing direction, the tension reduction of the V-belt can be compensated for without installing an expensive device additionally.

Therefore, the pulley structure for automobiles according to the present invention does not require a separate installation work and installation space, so that the yield of the production line can be improved as compared with the prior art to which the auto tensioner is applied, and the compact engine room can be designed. There is also an advantage.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a schematic diagram showing a connection state of a vehicle pulley and a V-belt according to an embodiment of the present invention, showing an example in which an auxiliary device using a driving force of an automobile engine as a power source is a compressor and a generator.

As shown in FIG. 1, the crankshaft 12 of the automobile engine 10 and the output shafts of the compressor 14 and the generator 16 respectively have a crank pulley 13, a compressor pulley 15, and a generator pulley 17. Are connected, and these pulleys 13, 15, and 17 are rotated by power transmission by the V-belts 20 and 21.

Therefore, when the crankshaft 12 rotates, the compressor 14 and the generator 16, which receive the rotational force through the respective V-belts 20 and 21, are driven, and the pulleys 13 and 15 according to the present invention. When the tension of the V-belts 20 and 21 decreases as the automobile engine 10 is operated for a long time, the outer diameter of the pulleys 13, 15 and 17 is increased by centrifugal force, thereby increasing the outer diameter of the V-belt. By compensating for the decrease in tension of the 20 and 21, the compressor 14 and the generator 16 can be operated smoothly.

Figure 2 is a perspective view showing the pulley (13, 15, 17) according to an embodiment of the present invention, Figure 3a and Figure 3b is a case in which the tension of the v-belts (20, 21) is normal and the tension is lowered, respectively 2 is a cross-sectional view taken along AA of the operation of the pulleys 13, 15 and 17. FIG.

The pulleys 13, 15 and 17 according to the present invention are composed of four pieces 30a, 30b, 30c and 30d having a fan shape (specifically a quarter circle shape) and a rotating shaft 31 therein. ) Includes a pulley body 30 having a circular hollow portion 32 forming a concentric circle, and a disc 40 coupled to the hollow portion 32, wherein the pieces 30a, 30b, 30c, 30d Each can move in the direction in which the outer diameter of the pulley body 30 increases along the outer surface of the disc 40.

At this time, the hollow portion 32 formed in each of the pieces (30a, 30b, 30c, 30d) is formed with an opening 33 into which the disc 40 is inserted, and on both inner surfaces of the hollow portion 32 A plurality of grooves 34 spaced apart in the direction are formed.

In addition, the outer surface of the disc 40 is formed with a plurality of projections 44 to be fitted with a plurality of grooves 34 provided in each piece (30a, 30b, 30c, 30d), each piece 30a, 30b, 30c, and 30d move along the groove 34 and the protrusion 44 in the direction in which the outer diameter of the pulley body 30 increases.

Referring to the operation of the pulley (13, 15, 17) according to the present invention having such a structure in detail, when the pulley (13, 15, 17) is rotated, each piece (30a, 30b, 30c, 30d) Is subjected to centrifugal force (F) in a direction perpendicular to the circumference as shown in Equation 1 below by its weight.

F = mrω ² ........................... [Formula 1]

At this time, if the tension of the V-belts 20 and 21 is normal, since the tension of the V-belts 20 and 21 is greater than the centrifugal force, the four pieces 30a, 30b, 30c, and 30d are shown in FIG. In spite of the centrifugal force, they are collected on the rotating shaft 31 by the tension of the V-belts 20 and 21 to maintain a minimum outer diameter. As a result, the pulleys 13, 15, 17 and the V-belt 20 21) makes stable surface contact.

However, if the tension of the V-belts 20 and 21 gradually decreases as the operating time of the engine 10 increases, the centrifugal force is greater than the tension of the V-belts 20 and 21, as shown in FIG. 3B. Likewise, the four pieces 30a, 30b, 30c, and 30d each have a direction in which the outer diameters of the pulleys 13, 15 and 17 increase along the outer surface of the disc 40 despite the tension of the V-belts 20 and 21 ( That is, in the direction of the arrow).

Due to this, the tension of the V-belts 20, 21 is gradually increased, and the four pieces 30a, 30b, 30c, 30d have a centrifugal force equal to or less than the tension of the increased V-belts 20, 21. The movement stops at the losing position. As a result, the pulleys 13, 15, and 17 according to the present invention have the pulleys 13, 15 and 17 and the V-belt even when the tension of the V-belts 20 and 21 is not installed. 20, 21) has the advantage of allowing a stable surface contact.

In this case, the grooves 34 and the protrusions 44 formed in the hollow portion 32 and the disc 40 of the pulley body 30 according to the present invention are configured in a sawtooth shape, so that the operation of the engine 10 is stopped. In this case, it is preferable that the outer diameters of the increased pulleys 13, 15, and 17 are maintained so that the tension of the V-belts 20 and 21 can be maintained. That is, when the groove 34 of the pulley body 30 passes over the protrusion 44 of the disc 40 by centrifugal force as described above, the protrusion 44 of the disc is elastically deformed, and the pulley body 30 After the groove 34 of the disc 40 completely passes over the projection 44, the projection 44 is restored to its original state, so that the pulley body 30 cannot return to its initial position. .

In addition, the pulley (13, 15, 17) structure according to the present invention, as shown in Figures 3a and 3b, the number (6) of the grooves 34 formed in the hollow portion 32, respectively, of the disc 40 It is configured to be larger than the number (3) of the projections 44 formed in the corresponding position, each of the four pieces (30a, 30b, 30c, 30d) can be moved by a distance corresponding to the difference of the number.

In addition, the pulleys 13, 15, and 17 according to the present invention have a thickness of the disc 40 of the portion where the protrusion 44 is formed on the opening 33 side of the hollow portion 32 into which the disc 40 is inserted. The four pieces 30a, 30b, 30c, and 30d each have a straight line 35 having a small thickness, and are configured to be no longer moved after a predetermined distance. This is to prevent the 30c and 30d from being separated from the disc 40.

As described in detail above, the pulley (13, 15, 17) structure according to the present invention is configured so that the outer diameter of the pulley (13, 15, 17) by the centrifugal force due to rotation, it is not easy to install and expensive Even if the auto-tensioner is not separately installed, the auxiliary devices 14 and 16 using the driving force of the engine 10 can be smoothly operated by compensating for the case where the tension of the V-belts 20 and 21 is reduced. There is an advantage to this.

In addition, in this embodiment, the pulley main body 30 has been described as an example of the four pieces (30a, 30b, 30c, 30d), but is not limited to this, such as three, five, six, etc. It can be composed of pieces. However, in order to smoothly rotate the V-belts 20 and 21 even when the outer diameters of the pulleys 13, 15 and 17 are increased, the shape of the pulleys 13, 15 and 17 may be maintained in a circular shape. It is desirable to increase the number.

At this time, the appropriate number of pieces is preferably selected in consideration of the cost required for the manufacture of the pulleys (13, 15, 17) and the shape of the pulleys (13, 15, 17) when the outer diameter increases.

1 is a schematic view showing a connection state of a pulley for automobile and a V-belt according to an embodiment of the present invention;

2 is a perspective view showing a pulley according to an embodiment of the present invention, and

3A and 3B are cross-sectional views taken along line A-A of FIG. 2 showing the operation of the pulley when the tension of the v-belt is normal and when the tension is lowered, respectively.

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

13,15,17 Pulley 30 Pulley body

30a, 30b, 30c, 30d: piece 31: rotating shaft

32: hollow part 34: groove

40: disc 44: protrusion

Claims (5)

In the vehicle pulley coupled to the V-belt for transmitting the driving force of the engine, A pulley body having a circular hollow portion concentric with a rotating shaft therein; and Including a disk coupled to the hollow portion, The pulley body is composed of a plurality of fan-shaped pieces, each of the pieces are movable in the direction of increasing the outer diameter of the pulley body along the outer surface of the disc, The hollow portion is formed with an opening into which a disc is inserted, and a plurality of grooves spaced in the circumferential direction are formed in the inner surface of the hollow portion, and the outer surface of the disc is fitted with a plurality of grooves provided in each piece. A plurality of protrusions are formed, The opening side disc of the hollow part is a pulley structure for automobiles, characterized in that a straight portion having a thickness smaller than the disc thickness of the portion where the projection is formed. delete The method of claim 1, In order to prevent the respective pieces from moving in a direction in which the outer diameter of the pulley body is reduced, the groove and the projection is a car pulley structure, characterized in that formed in the sawtooth shape. delete delete

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