KR20090115302A - Auto-pulley for Generator of Automobile - Google Patents

Abstract

PURPOSE: An auto-pulley for a generator of a vehicle is provided to prevent a reverse current due to reverse rotation of a rotor by rotating a fixing unit with the pulley body as one when a crank shaft rotates forward. CONSTITUTION: A fixing body(10) is installed in an end of a rotor(100) of a generator for a vehicle. A central bearing(20) is elastically installed in a bearing mounting unit of the fixing body. A bearing holder(30) is installed in the bearing mounting unit to rotate in one direction. Upper and lower bearings(40a,40b) are installed in the upper and lower sides of the fixing body. A mounting hole(51) is formed in the center of a pulley body(50). The bearing holder and the upper and lower bearings are installed in the mounting hole of the pulley body.

Description

Auto-pulley for Generator of Automobile

The present invention relates to an auto pulley for an automobile generator, and more particularly, to an auto pulley for an automobile generator which can effectively prevent the crankshaft from rotating in reverse by the inertial force of the generator when the engine is stopped.

In general, a motor vehicle is provided with a generator for power supply and a charger required for a power system or a light system.

The generator is connected to the drive shaft, that is, the crankshaft and the belt of the engine together with the starting motor, the compressor and the like. At this time, the generator is mounted on the end of the rotor so that it can be interlocked by the belt. The pulley thus mounted rotates the rotor as the belt rotates due to the rotation of the crankshaft, thereby eventually obtaining power from the generator.

However, conventional pulleys for generators have the following problems.

1) Since the pulley is fixed to the rotor with bolts or the like, the crankshaft rotates in the opposite direction due to inertia when the engine is stopped. The rotor also rotates in reverse to generate reverse current. This reverse current causes damage to the generator.

2) In addition, since the inertia of the crankshaft causes the belt with a constant tension to be repeatedly pushed, it acts as a cause of shortening the life of the belt.

3) Various components connected by a belt, for example, a generator, as well as a starter or a pulley of the compressor simultaneously move in the opposite direction, which causes the noise of the entire vehicle to increase.

The present invention has been devised in view of the above, and is configured to separate the fixture fixed to the rotor of the generator from the pulley body, in particular, the fixture is rotated integrally with the pulley body only when the crankshaft forward rotation, the crankshaft reverse rotation In this case, only the pulley body is idling to prevent the occurrence of reverse current caused by the reverse rotation of the rotor, as well as to prolong the life of the belt and to provide an auto pulley for automobile generators that can be used stably. have.

As a means for realizing this, an auto pulley for an automobile generator according to the present invention,

Fixture body (10) fixed to the rotor 100 of the generator for the vehicle end;

A central bearing 20 elastically installed at each bearing mounting portion 12 formed at equal intervals in the center of the outer peripheral surface of the fixture body 10;

A bearing holder 30 installed in the bearing mounting portion 12 so as to be rotatable only in one direction with the support of the central bearing 20;

Upper and lower bearings 40a and 40b respectively installed at upper and lower portions of the fixture body 10 so as to be positioned at upper and lower portions of the bearing mounting portion 12; And

The bearing holder 30, the upper and lower bearings (40a, 40b) is provided with a mounting hole 51 in which the pressure reducing installation is formed in the center; pulley body 50; characterized in that it comprises a.

In addition, the fastener body 10 may be screwed to the gear portion 11a and the rotor 100 to be engaged with the rotor 100 inside the fixing hole 11 into which the rotor 100 is inserted. The female screw part 11b is formed. In particular, the fastener body 10 is formed with washer grooves (13a, 13b) on the outer peripheral surface so as to be located on the upper and lower portions of the bearing mounting portion (12).

In addition, each bearing mounting portion 12 is formed in the groove shape along the longitudinal direction of the fixture body 10, the depth is formed larger than the radius (r) of the central bearing 20 and smaller than the diameter (D). In particular, each bearing mounting portion 12 has a bottom surface perpendicular to the radial direction. In addition, each bearing mounting portion 12 has different curvatures at both ends of the bottom surface, and one end of the second curvature portion R2 on which the central bearing 20 is mounted is the first of the other end on which the elastic spring 21 is mounted. It is formed larger than the curvature R1. At this time, the radius of curvature R2 is equal to the radius of the center bearing 20.

In addition, the center bearing 20 may use a needle bearing.

In addition, each center bearing 20 is installed in the longitudinal direction of the fixture body 10 is installed to receive the support of the elastic spring 21.

In addition, the bearing holder 30 is installed to rotate in the clockwise direction in the state mounted on the generator. In particular, the bearing holder 30 includes upper and lower washers 31a and 31b mounted to upper and lower portions of the bearing mounting portion 12, respectively. In addition, the bearing holder 30 has a cylindrical shape having the same outer diameter as the outer diameter of the upper and lower bearings 40a and 40b.

In addition, the upper and lower bearings (40a, 40b) is characterized in that each is a sliding bearing.

According to the present invention has the following effects.

1) Since the pulley rotates only in the forward rotation, it is possible to prevent the rotor from rotating in reverse even if the crankshaft reverses due to inertia. Accordingly, damage to the generator due to reverse current generated by reverse rotation of the rotor can be prevented.

2) In addition, even if the crankshaft rotates in reverse, the pulley is separated from the fixture and rotates together with the belt, so that the belt can be prevented from being damaged and the life of the belt can be extended.

3) In particular, it is possible to reduce the noise generated from these components because the reaction force applied to the generator, the compressor or the starting motor can be reduced by the reaction during the reverse rotation of the crankshaft.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings.

(Configuration)

1 is an exploded perspective view showing the configuration of an auto pulley for an automobile generator according to the present invention. Here, reference numeral 100 denotes the rotor of the generator.

The auto pulley according to the present invention includes a fixture body 10 mounted on the rotor 100 and a pulley body 50 installed to be rotatable only in one direction on the fixture body 10. In particular, the fastener body 10 is mounted on the outer circumferential surface with a central bearing 20 and upper and lower bearings 40a and 40b, respectively. If this is explained in more detail as follows.

Figure 2 is a perspective view showing a fixture body according to the present invention. As shown in FIG. 2, the fixture body 10 has a cylindrical shape in which a fixing hole 11 stepped in the longitudinal direction is formed. In particular, a gear portion 11a is formed in the large diameter portion in the fixing hole 11, and a female screw portion 11b is formed in the small diameter portion. Moreover, the bearing mounting part 12 protrudes and is formed in the center part of the length in the outer peripheral surface, and washer grooves 13a and 13b are formed in the upper and lower parts of this bearing mounting part 12, respectively.

3A is a plan view of the fixture body 10 for explaining the bearing mounting portion 12 according to the present invention. As shown in FIG. 3A, the center bearing 30 is mounted on the bearing mounting portion 12, and the bearing holder 40 is mounted to the outside thereof. The bearing mounting portions 12 are formed at equal intervals on the outer circumferential surface of the fixture body 10. 2 shows an example in which eight bearing mounting parts 12 are formed. Each bearing mounting portion 12 is cut in a groove shape over the entire length of the fixture body (10). In particular, the bearing mounting portion 12 is formed with the bottom surface perpendicular to the circumferential direction. In addition, the bearing mounting portion 12 is machined into different first and second curvature portions R1 and R2 at both ends of the bottom surface, respectively. In this case, the first and second curvature parts R1 and R2 are determined according to the mounting positions of the central bearing 20 and the elastic spring 21 to be described later. That is, the first curvature R1 supports the end of the elastic spring 21 and the second curvature R2 supports the center bearing 20. Accordingly, it is preferable that the first curvature portion R1 has a smaller radius of curvature than the second curvature portion R2. In addition, the sidewall of the first curvature portion (R1) is formed to be inclined inward as it goes up to be formed to prevent the support and the spring to be thrown out of the elastic spring (21). In addition, the second curvature portion R2 may increase the contact force by forming a radius of curvature equal to the radius of the central bearing 20.

In a preferred embodiment of the present invention, the bearing mounting portion 12 is preferably formed in the height of the groove shape is larger than the radius (r) of the central bearing 20 and smaller than the diameter (D). This is to allow the fastener body 10 and the pulley body 50 to rotate together by the central bearing 20 accommodated in the bearing mounting portion 12 through interference with the bearing holder 30 which will be described later. An operation description thereof will be described later.

In addition, a needle bearing may be used as the central bearing 20 mounted on the bearing mounting portion 12 formed as described above.

On the other hand, the fixture body 10 is further provided with a bearing holder 30 in the bearing mounting portion 12. Bearing holder 30 is made of a thin cylinder shape surrounding the bearing mounting portion 12 from the outside. In particular, the bearing holder 30, as shown in Figure 3b, the inner diameter of the length or slightly larger than the outer diameter (Dc) of the fastener body 10 plus twice the diameter (D) of the central bearing (20) To form. This allows the bearing holder 30 to slide freely when the center bearing 20 is in the center of the bottom surface of the bearing mounting portion 12, and the center bearing 20 at the center of the bottom surface of the bearing mounting portion 12. It is to cause interference when it is out of order.

In addition, the bearing holder 30 includes upper and lower washers 31a and 31b for supporting the central bearing 20. The upper and lower washers 31a and 31b are mounted in the washer grooves 13a and 13b of the fixture body 10, respectively. Accordingly, each of the central bearings 20 and the elastic springs 21 are enclosed in the space formed by the bearing holder 30 and the upper and lower washers 31a and 31b.

In addition, the fastener body 10 is provided with upper and lower bearings 40a and 40b on the outer circumferential surface, respectively, above and below the barely mounting portion 12. In a preferred embodiment of the invention, the upper and lower bearings 40a and 40b preferably employ sliding bearings. This is to maximize the contact area. In particular, the upper and lower bearings (40a, 40b) is to use the outer diameter having the same outer diameter as the bearing holder (30).

Fixture body 10 made in this way is inserted and mounted to the pulley body (50). Pulley body 50 has a belt groove 52 is formed to be coupled to the belt on the outer peripheral surface. In addition, a mounting hole 51 for depressurizing the fastener body 10 is formed in the center of one surface. In particular, the mounting hole 51 has an inner diameter that is equal to or slightly smaller than the outer diameter of the bearing holder 30. This is for forcibly depressurizing the fixture body 10 to the mounting hole 51. In addition, the fixture body 10 is coupled to the pulley body 50, is engaged with the rotor 100 is fastened and fixed with a bolt (60).

(work)

Figure 4a is a plan view for explaining the rotation state when rotating in the forward direction of the motor vehicle auto pulley according to the present invention. Here, reference numeral 100 denotes a rotor of the generator, and reference numeral 200 denotes a belt.

As shown in FIG. 4A, when the vehicle is started, the belt 200 connected to the crankshaft rotates. Here, it is assumed that the belt 200 rotates in the counterclockwise direction. When the belt rotates, the pulley body 50 rotates counterclockwise. Accordingly, the pulley body 50 and the bearing holder 30 in surface contact rotate together. At this time, the center bearing 20 also moves along the bottom surface of the bearing mounting portion 12 by line contact, as indicated by the arrow in FIG. 4A. The center bearing 20 causes interference with the bearing holder 30 as it moves to one side of the bearing mounting portion 12, and the center bearing 20 is interposed between the bearing mounting portion 12 and the bearing holder 30 due to such interference. It becomes stuck. Therefore, the bearing holder 30 and the fixture body 10 are rotated at the same time. When the fixture body 10 rotates, the rotor 100 of the generator (not shown) mounted at the center rotates to generate power. In this case, the upper and lower bearings 40a and 40b are brought into close contact with each other between the fixture body 10 and the pulley body 50 and rotate together.

Figure 4b is a plan view for explaining the rotation state when the motor vehicle auto pulley according to the present invention rotates in the reverse direction. Here, reference numeral 100 denotes a rotor of the generator, and reference numeral 200 denotes a belt.

When the car is off, the crankshaft will rotate left and right by inertia. 4b shows a state of rotating in the reverse direction during the stirring rotation. When the belt 200 is rotated clockwise by the stirring rotation of the crankshaft, the pulley body 50 also rotates clockwise.

Accordingly, the bearing holder 30, which is installed at a reduced pressure on the pulley body 50, also moves in a clockwise direction. At this time, the central bearing 20 in the state sandwiched between the bearing holder 30 and the bearing mounting portion 12 is moved to the bottom surface center portion of the bearing mounting portion 12 by a rolling action. When the central bearing 20 is moved to the bottom center of the bearing mounting portion 12, since the contact between the bearing mounting portion 12 and the bearing holder 30 is not made or the contact force is weakened, the fixture body 10 is No more rotation Accordingly, the rotor 100 of the generator (not shown) does not rotate, thereby preventing the generation of reverse current. In this case, the upper and lower bearings 40a and 40b are supported to rotate only the pulley body 50 while being supported by the fixture body 10.

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.

1 is an exploded perspective view showing the configuration of an auto pulley for an automobile generator according to the present invention.

Figure 2 is a perspective view showing a fixture body according to the present invention.

Figure 3a and Figure 3b is a plan view of the fixture body for explaining the bearing mounting portion according to the present invention.

Figure 4a is a plan view for explaining the rotation state when rotating in the forward direction of the motor vehicle auto pulley according to the present invention.

Figure 4b is a plan view for explaining the rotation state when the motor vehicle auto pulley according to the present invention rotates in the reverse direction.

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

10: fixture body

11: fixing hole

11a: gear part

11b: female thread

12: bearing mounting part

13a, 13b: Washer groove

20: center bearing

21: elastic spring

30: bearing holder

31a: Top washer

31b: Lower washer

40a: Upper bearing

40b: Lower bearing

50: pulley body

51: mounting hole

52: belt groove

100: rotor

200: belt

R1: first curvature portion

R2: second curvature

Claims (14)

Fixture body (10) fixed to the rotor 100 of the generator for the vehicle end; A central bearing 20 elastically installed at each bearing mounting portion 12 formed at equal intervals in the center of the outer circumferential surface of the fixture body 10; A bearing holder (30) installed at the bearing mounting portion (12) to be supported by the center bearing (20) so as to be rotatable only in one direction; Upper and lower bearings 40a and 40b respectively installed on upper and lower portions of the fixture body 10 so as to be positioned above and below the bearing mounting part 12; And And a pulley body (50) having a mounting hole (51) at the center of which the bearing holder (30), the upper and lower bearings (40a, 40b) are installed at a reduced pressure. The method of claim 1, The fastener body 10 has a gear part 11a meshed with the rotor 100 in the fixing hole 11 into which the rotor 100 is inserted, and screwing the rotor 100 with the rotor 100. Auto pulley for an automobile generator, characterized in that the female screw portion (11b) is formed to be possible. The method according to claim 1 or 2, The fastener body (10) is an auto pulley for an automobile generator, characterized in that washer grooves (13a, 13b) are formed on the outer circumferential surface so as to be located at the upper and lower portions of the bearing mounting portion (12). The method of claim 1, Each bearing mounting portion 12 is formed in a groove shape along the longitudinal direction of the fixture body 10, the depth of the groove is greater than the radius (r) of the central bearing 20, the diameter of the central bearing 20 Auto pulley for an automobile generator, characterized in that formed smaller than (D). The method according to claim 1 or 4, Each of the bearing mounting portion 12 is a motor generator auto pulley, characterized in that the bottom surface is formed perpendicular to the radial direction. The method of claim 5, wherein Each of the bearing mounting portions 12 has a radius of curvature of the first curvature R1 and the second curvature R2 formed at both ends of the bottom surface, and are different from each other. The method of claim 6, The bearing mounting portion 12 is characterized in that the second curvature portion (R2) of one end of the central bearing 20 is mounted is larger than the first curvature portion (R1) of the other end on which the elastic spring 21 is mounted. Auto pulley for car generator. The method of claim 7, wherein The second curvature portion (R2) is a radius of the auto generator pulley, characterized in that the radius of the same as the radius of the central bearing (20). The method of claim 1, The central bearing 20 is an auto pulley for an automobile generator, characterized in that the needle bearing. The method according to claim 1 or 9, Each of the central bearings 20 is installed in the longitudinal direction of the fastener body 10 is an auto-pulley for an automobile generator, characterized in that supported by the elastic spring 21. The method of claim 1, The bearing holder 30 is an auto pulley for an automobile generator, which is installed to rotate in a clockwise direction in a state in which the generator is mounted. The method according to claim 1 or 11, wherein The bearing holder 30 comprises an upper washer 31a and a lower washer 31b mounted on the upper and lower portions of the bearing mounting part 12, respectively. The method of claim 12, The bearing holder 30 is an auto pulley for an automobile generator, characterized in that the cylindrical shape having the same outer diameter as the outer diameter of the upper and lower bearings (40a, 40b). The method of claim 1, The upper and lower bearings (40a, 40b) are auto pulleys for automobile generators, characterized in that each is a sliding bearing.

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