阅读说明：本技术 用于传递烘干机驱动力的皮带轮组件 (Pulley assembly for transmitting driving force of dryer ) 是由 张贞喆 朱成仲 金永哲 金玟成 于 2020-04-10 设计创作，主要内容包括：根据本发明的用于传递烘干机驱动力的皮带轮组件包括：旋转轴(41),用于驱动所述烘干机的滚筒(20)的驱动电机(40)；皮带轮(50),与所述旋转轴(41)的一端相耦合,其上运行的驱动力传递带(30)用于将所述驱动电机(40)的驱动力传递到所述滚筒(20)；以及皮带轮导向器(60),其耦合到所述旋转轴(41)并被安装在所述皮带轮(50)的一侧,其中,所述皮带轮(50)包括皮带轮主体(51),所述皮带轮主体(51)包括轮毂(52)及形成在所述轮毂(52)两端的第一锁定环(53)和第二锁定环(54),所述轮毂(52)上运行有皮带(30)并且所述旋转轴(41)贯穿所述轮毂(52)。(The pulley assembly for transmitting a driving force of a dryer according to the present invention comprises: a rotary shaft (41) for driving a driving motor (40) of a drum (20) of the dryer; a pulley (50) coupled to one end of the rotary shaft (41), and having a driving force transmission belt (30) running thereon for transmitting the driving force of the driving motor (40) to the drum (20); and a pulley guide (60) coupled to the rotation shaft (41) and installed at one side of the pulley (50), wherein the pulley (50) includes a pulley body (51), the pulley body (51) includes a hub (52) and first and second locking rings (53, 54) formed at both ends of the hub (52), a belt (30) runs on the hub (52) and the rotation shaft (41) penetrates the hub (52).)

1. A pulley assembly for transmitting a driving force of a dryer,

the method comprises the following steps:

a rotary shaft (41) for driving a driving motor (40) of a drum (20) of the dryer;

a pulley (50) coupled to one end of the rotary shaft (41), and having a driving force transmission belt (30) running thereon for transmitting the driving force of the driving motor (40) to the drum (20); and

a pulley guide (60) coupled to the rotation shaft (41) and installed at one side of the pulley (50),

wherein the pulley (50) comprises a pulley body (51), the pulley body (51) comprises a hub (52) and a first locking ring (53) and a second locking ring (54) formed at both ends of the hub (52), a belt (30) runs on the hub (52) and the rotating shaft (41) penetrates through the hub (52).

2. The pulley assembly of claim 1,

the pulley guide (60) includes:

a rotating shaft fitting hole (61A) formed at the center penetrating the inner sleeve (61);

reinforcements (62) formed at regular intervals along the outer circumference of the inner sleeve (61);

a cover (63) formed integrally with the reinforcement (62);

contact protrusions (64) protrudingly formed at regular intervals along an inner circumference of the inner sleeve (61); and

a flat surface (65) formed at one side of an inner circumference of the inner sleeve (61) such that the rotation shaft fitting hole (61A) is cut in a D-shape,

wherein the flat surface (65) of the pulley guide (60) and the cutting surface (41B) of the rotating shaft (41) are coupled in surface contact with each other.

3. The pulley assembly of claim 2 wherein,

the housing (63) of the pulley guide (60) is formed to have an inclined surface (63A) gradually lowered toward the first locking ring (53) of the pulley body (51),

the curved inclined surface (53A) formed on the first locking ring (53) forms a continuous inclined surface with the inclined surface (63A).

4. The pulley assembly of claim 2 wherein,

a convex fitting surface (66) in a circular arc shape is formed on one side of the inner circumference of the inner sleeve (61) of the pulley guide (60),

the male-type mating surface (66) of the pulley guide (60) and the cutting surface (41B) of the rotary shaft (41) are coupled in surface contact with each other.

5. Pulley assembly according to claim 4, wherein magnets (M) are formed by injection moulding on the inside of the male mating surface (66) of the pulley guide (60).

6. A pulley assembly according to claim 3, wherein a magnet (M) is formed by injection moulding inside the flat surface (65) of the pulley guide (60).

Technical Field

The present invention relates to a pulley assembly for transmitting a driving force of a dryer for drying laundry. More particularly, the present invention relates to a pulley assembly which couples a pulley and a pulley guide fixed to a rotating shaft of a driving motor (driving motor) to be firmly coupled to the rotating shaft, to prevent a driving force transmitting belt (driving force transmitting belt) running on a hub of the pulley from derailing when the rotating shaft rotates, thereby improving the performance of the dryer.

Background

Generally, a dryer for drying laundry dries the laundry by causing hot air generated from a heater to form a forced circulation in a drum and evaporating moisture contained in the laundry put into the drum.

As disclosed in korean patent laid-open publication No. 10-2013-0083670, such a dryer is provided with a safety cover at the top of a main body to form the outside of the dryer, and a door at one side surface of the inside of the main body to put laundry into and take laundry out of the dryer. In addition, the dryer is provided with a rotatable drum inside the main body so as to dry laundry to be dried, and the drum is rotatably supported inside the main body by front and rear supporters. The drum having a cylindrical shape is connected to a driving motor provided at the bottom of the dryer through a driving force transmission belt to receive a driving force. A pulley is provided at one side of the driving motor, and the driving force transmission belt is engaged with the pulley to surround the drum and rotate the drum by the driving force transmission belt.

This configuration allows the pulley engaged with the driving force transmission belt for rotating the drum to have a hub at the center of the pulley body and to form locking edges higher than the hubs at both ends of the hubs, while the driving force transmission belt runs on the hubs of the pulley on the rotating shaft of the driving motor, wherein a thread formed along the circumferential surface of the inside of the pulley body is coupled with a thread formed on the rotating shaft.

The hub of the conventional pulley engaged with the driving force transmission belt rotates the drum through the driving force transmission belt, and the pulley rotates together with the rotating shaft when the driving motor is operated. When the number of rotations per minute of the driving motor becomes larger or smaller according to the control program for rotating the drum, since the driving force transmission belt engaged with the hub of the rotating pulley runs on the hub, the driving force transmission belt may be moved leftward or rightward by the vibration of the drum when the drum is rotated. The driving force transmission belt may be separated from the hub of the pulley by such movement, resulting in uneven rotation of the drum, thereby causing a reduction in reliability of the dryer.

Disclosure of Invention

Technical problem

The present invention is directed to prevent a driving force transmission belt engaged with a hub of a pulley from derailing when a rotation shaft of a driving motor is rotated by installing a pulley guide coupled with the rotation shaft at one side of the pulley coupled with the rotation shaft.

It is still another object of the present invention to transmit a driving force while safely operating a driving force transmission belt in a hub of a pulley by firmly coupling a rotating shaft and a pulley guide together.

Another object of the present invention is to manufacture a pulley guide as a separate member from a pulley so as to manufacture the pulley guide as a molded plastic product, thereby reducing manufacturing costs.

The above objects and others that will be derived therefrom are readily achieved by the present invention as explained below.

Technical scheme

The pulley assembly for transmitting a driving force of a dryer according to the present invention comprises: a rotary shaft 41 for driving a driving motor 40 of the drum 20 of the dryer; a pulley 50 coupled to one end of the rotary shaft 41, and having a driving force transmission belt 30 running thereon for transmitting the driving force of the driving motor 40 to the drum 20; and a pulley guide 60 coupled to the rotation shaft 41 and installed at one side of the pulley 50, wherein the pulley 50 includes a pulley body 51, the pulley body 51 includes a hub 52, and a first locking ring 53 and a second locking ring 54 formed at both ends of the hub 52, the hub 52 has the belt 30 running thereon and the rotation shaft 41 penetrates the hub 52.

In the present invention, preferably, the pulley guide 60 includes: a rotation shaft fitting hole 61A formed centrally through the inner sleeve 61; reinforcements 62 formed at regular intervals along the outer circumference of the inner sleeve 61; a cover 63 formed integrally with the reinforcement 62; contact protrusions 64 protrudingly formed at regular intervals along the inner circumference of the inner sleeve 61; and a flat surface 65 formed at one side of the inner circumference of the inner sleeve 61 such that the rotation shaft fitting hole 61A is cut in a D-shape, wherein the flat surface 65 of the pulley guide 60 and the cut surface 41B of the rotation shaft 41 are coupled in surface contact with each other.

In the present invention, it is preferable that the housing 63 of the pulley guide 60 is formed to have an inclined surface 63A gradually becoming lower toward the first locking ring 53 of the pulley body 51, and the curved inclined surface 53A formed on the first locking ring 53 forms a continuous inclined surface with the inclined surface 63A.

In the present invention, a convex fitting surface 66 of a circular arc shape is formed at one side of the inner circumference of the inner sleeve 61 of the pulley guide 60, and the convex fitting surface 66 of the pulley guide 60 and the cutting surface 41B of the rotary shaft 41 may be coupled in surface contact with each other.

In the present invention, the magnet M may be formed inside the male mating surface 66 of the pulley guide 60 by injection molding.

In the present invention, the magnet M may be formed inside the flat surface 65 of the pulley guide 60 by injection molding.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention mounts a pulley guide coupled with a rotating shaft on an outer surface of a locking ring at one side of a pulley coupled with a rotating shaft of a driving motor to prevent a driving force transmission belt engaged with a hub of the pulley from derailing when the rotating shaft rotates. Therefore, the present invention has the following effects: the reliability of the dryer is improved by preventing a problem of the drum caused by derailment of the driving force transmission belt when the dryer is operated, and the performance of the dryer is improved by preventing a slip of a pulley guide coupled with the rotation shaft when the rotation shaft is rotated, thereby allowing the driving force transmission belt to safely perform transmission of the driving force in the hub of the pulley.

Drawings

Fig. 1 is a perspective view illustrating a dryer mounted with a pulley assembly for transmitting driving force according to the present invention.

Fig. 2 is a perspective view illustrating a state in which a pulley assembly for transmitting driving force according to the present invention is installed in a dryer.

Fig. 3 is a side view illustrating a dryer mounted with a pulley assembly for transmitting a driving force according to the present invention.

Fig. 4 is an exploded perspective view illustrating a pulley assembly for transmitting driving force according to the present invention.

Fig. 5 is a cross-sectional view taken along a direction of a rotation axis showing a pulley assembly for transmitting driving force according to the present invention.

Fig. 6 is a cross-sectional view illustrating a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

Fig. 7 is a cross-sectional view taken along a direction of a rotation axis showing still another embodiment of a second lock ring of a pulley assembly for transmitting driving force according to the present invention.

Fig. 8 is a perspective view showing still another embodiment of a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

Fig. 9 is an exploded perspective view illustrating still another embodiment of a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

Fig. 10 is a cross-sectional view showing still another embodiment of a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

Fig. 11 is a cross-sectional view showing another embodiment of a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

Fig. 12 is a cross-sectional view showing still another embodiment of a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

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

Detailed Description

Fig. 1 illustrates a perspective view of a dryer in which a pulley assembly for transmitting driving force according to the present invention is installed. Fig. 2 is a perspective view illustrating a state in which a pulley assembly for transmitting driving force according to the present invention is installed in a dryer. Fig. 3 is a side view illustrating a dryer mounted with a pulley assembly for transmitting a driving force according to the present invention.

Referring to fig. 1 to 3, a safety cover 11 is provided on a top of a main body 10 of the dryer, thereby forming an exterior of the dryer. A door is provided at one side of the main body 10 of the dryer for putting laundry into the dryer. A rotatable drum 20 is provided within the main body 10 of the dryer to receive wet laundry and dry it.

The drum 20 is rotatably supported inside the main body 10 of the dryer. The drum 20 having a cylindrical shape is connected to a driving motor 40 provided at the bottom of the dryer by a driving force transmission belt 30 to receive a driving force by the rotation of the driving motor 40 to rotate. The pulley 50 is screw-coupled to the rotary shaft 41 of the driving motor 40; the drum 20 is rotated by the operation of a driving force transmission belt 30, the driving force transmission belt 30 surrounds the drum 20 via an idle pulley (idle pulley)50A selectively installed, and the driving force transmission belt 30 is engaged with the pulley 50.

Fig. 4 is an exploded perspective view illustrating a pulley assembly for transmitting driving force according to the present invention. Fig. 5 is a cross-sectional view taken along a direction of a rotation axis showing a pulley assembly for transmitting driving force according to the present invention. Fig. 6 is a cross-sectional view illustrating a pulley guide in a pulley assembly for transmitting driving force according to the present invention.

As shown in fig. 4 to 6, the pulley 50, which is engaged with the driving force transmission belt 30 for rotating the drum 20, includes: pulley body 51, hub 52, first locking ring 53 and second locking ring 54. The hub 52 is disposed at the center of the pulley body 51, and is coupled to the rotary shaft 41 of the drive motor 40 so as to be clamped by the drive force transmission belt 30. The first locking ring 53 and the second locking ring 54 are formed at both ends of the hub 52, respectively, and are formed to have a diameter larger than that of the hub 52. A curved inclined surface 53A is formed on an inner side surface of the first locking ring 53. An inclined surface 54A is formed on an inner side surface of the second lock ring 54. The circumference of the second locking ring 54 is formed in a nut shape to facilitate working using a tool such as a power wrench (spanner) when coupling the pulley 50 to the rotating shaft 41.

The screw 55 is formed along a circumferential surface of a hole penetrating a rotation shaft passing through the center of the pulley body 51, and the screw 41A is formed at one end of the rotation shaft 41. Accordingly, the pulley 50 is coupled to the rotation shaft 41. A pulley guide 60 coupled to the rotating shaft 41 is installed at one side of the first locking ring 53 of the pulley 50 adjacent to the pulley 50.

The pulley guide 60 includes: an inner sleeve 61, a reinforcement 62, an outer cover 63, a contact protrusion 64, and a flat surface 65. An inner sleeve 61 is formed at the center of the pulley guide 60 in the direction of the rotation shaft 41 to surround the rotation shaft 41, and a rotation shaft fitting hole 61A coupled with the rotation shaft 41 is formed in the inner sleeve 61.

The reinforcements 62 are formed at regular intervals along the outer circumference of the inner sleeve 61. The reinforcing member 62 has a structure capable of reducing the amount of material used to form the pulley guide 60 and reinforcing the strength of the cover 63 integrally formed with the reinforcing member 62. The contact protrusions 64 are formed to protrude at a predetermined interval along the inner circumference of the inner sleeve 61. The flat surface 65 causes the fitting hole 61A of the inner sleeve 61 to be cut into a D shape. Pulley guide 60 is coupled with rotating shaft 41 such that flat surface 65 of pulley guide 60 and cutting surface 41B of rotating shaft 41 are in surface contact with each other.

The housing 63 has an inclined surface 63A which becomes gradually lower toward the pulley 50. The curved inclined surface 53A of the pulley 50 is in contact with the inclined surface 63A of the housing 63 to form a continuous inclined surface. The curved inclined surface 53A and the inclined surface 63A become higher gradually from the first locking ring 5 of the pulley body 51 toward the driving motor 40. Therefore, the curved inclined surface 53A of the first locking ring 53 and the inclined surface 63A of the housing 63 are connected to have a continuous circumferential surface as a whole, thereby preventing the driving force transmission belt 30 from moving toward the driving motor 40.

In other words, when the driving motor 40 is operated, the rotating shaft 41, which is correspondingly rotated, is rotated together with the pulley 50 and the pulley guide 60. When the driving force is transmitted to the drum 20 by the driving force transmission belt 30 running on the hub 52 at the center of the pulley body 51, the driving force transmission belt 30 may be moved toward the first locking ring 53 of the pulley 50 by the vibration driven by the drum 20. In this case, the driving force transmission belt 30 can continuously maintain its correct position in the hub 52 at the center of the pulley main body 51 while sliding along the curved inclined surface 53A of the first locking ring 53 and the inclined surface 63A of the outer cover 63 of the pulley guide 60. Accordingly, derailment of the driving force transmission belt 30 is prevented, and accordingly, the driving force transmission belt 30 can safely transmit the driving force to the drum 20, thereby preventing a safety accident that may occur when the drum 20 is stopped due to derailment of the driving force transmission belt 30.

Fig. 7 is a cross-sectional view taken along the direction of the rotation axis showing still another embodiment of the second lock ring 54 of the pulley assembly for transmitting driving force according to the present invention. As shown in fig. 7, the circumferential diameter of the second locking ring 54 may be equal to or greater than the circumferential diameter of the first locking ring 53. This structure can positively prevent the drive force transmission belt 30 from moving in the outer direction of the second lock ring 54 when the drum 20 is operated.

Fig. 8 is a perspective view showing still another embodiment of a pulley guide 60 in a pulley assembly for transmitting driving force according to the present invention. Fig. 9 is an exploded perspective view and fig. 10 is a cross-sectional view thereof. The pulley assembly for transmitting driving force according to the present invention forms a firm mutual coupling between the screw thread 55 and the screw thread 41A, the screw thread 55 being formed along the circumferential surface of the rotation shaft fitting hole formed through the pulley body 51, the screw thread 41A being formed on the rotation shaft 41.

Referring to fig. 8 to 10, the contact protrusions 64 may be protruded along the inner circumference of the inner sleeve 61 of the pulley guide 60 at regular intervals. The contact protrusion 64 and the rotation shaft 41 are fitted to each other while the contact protrusion 64 is in surface contact with the circumferential surface of the rotation shaft 41 to form firm coupling.

Also, in the case where the pulley guide 60 is provided by injection molding using a synthetic resin material, since the rotation shaft 41 made of metal and the pulley guide 60 made of a synthetic resin material have different hardness, coupling force is increased by press-fitting the pulley guide along the circumferential surface of the rotation shaft 41 via the contact protrusion 64, so that the present invention can prevent the rotation shaft 41 and the pulley guide 60 from idling (running idle).

In addition, since the flat surface 65 of the pulley guide 60 and the cut surface 41B of the rotary shaft 41 are kept in surface contact with each other, as shown in fig. 6, when the rotary shaft 41 rotates, sliding is prevented by the flat surface 65 and the angular portions at both ends of the cut surface 41B of the rotary shaft 41, thereby forming a more firm coupling. Therefore, it is possible to prevent the idle running of the pulley guide 60 when the driving force transmission belt 30 running on the hub 52 at the center of the pulley body 51 rotates.

Meanwhile, as shown in fig. 8 to 10, the cutting surface 65 in fig. 6 may be formed as a convex mating surface 66 in a circular arc shape. That is, the male-type fitting surface 66 may be formed along one side of the inner circumference of the inner sleeve 61 of the pulley guide 60, and the male-type fitting surface 66 of the pulley guide 60 and the cutting surface 41B of the rotational shaft 41 may be coupled by means of press-fitting, thereby allowing the pulley guide 60 to be more firmly coupled to the rotational shaft 41.

Fig. 11 is a cross-sectional view showing another embodiment of a pulley guide 60 in a pulley assembly for transmitting driving force according to the present invention. FIG. 12 is a cross-sectional view showing yet another embodiment of a pulley guide 60.

The pulley guide 60 shown in fig. 11 is another embodiment in which the magnet M is formed by injection molding inside the flat surface 65 formed along one side of the inner circumference of the inner sleeve 61, and the pulley guide 60 shown in fig. 12 is yet another embodiment in which the magnet M is formed by injection molding inside the convex-shaped mating surface 66 along one side of the inner circumference of the inner sleeve 61. According to other embodiments of the present invention shown in fig. 11 and 12, the magnet M in the flat surface 65 or the magnet M in the convex-shaped fitting surface 66 is attached to the rotary shaft 41 as a metal magnet by a magnetic force with the pulley guide 60 and the rotary shaft 41 fitted to each other, thereby increasing the coupling force between the pulley guide 60 and the rotary shaft 41.

The detailed description of the present invention as described above illustrates some examples only for the understanding of the present invention, and is not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Further, simple modifications or variations of the present invention should be construed as also falling within the scope of the present invention.