KR100813916B1 - Power transmission and refrigerator having the same - Google Patents

Abstract

A power transmission unit and a refrigerator having the same are provided to change forward and backward power transmission rates simply by the transitional motion of a driving shaft and several driving and driven gears when transmitting power from a driving source. A power transmission unit includes a motor part for generating power, a driving shaft(110) connected to the motor part to carry out transitional motion in the longitudinal direction, first and second driving gears(112,114) formed on an outer peripheral surface of the driving shaft at a uniform interval, a driven shaft(120) adjacent to the driving shaft, and first and second driven gears(122,124) formed on an outer peripheral surface of the driven shaft to be engaged with the first and second driving gears respectively.

Description

Power transmission and refrigerator having the same

1 and 2 are perspective views showing one embodiment of a power transmission device according to the prior art.

Figure 3 is a perspective view showing another embodiment of the power transmission device according to the prior art.

4 is a cross-sectional view showing the power transmission device of FIG.

5 and 6 are perspective views showing the operation of the power transmission device according to an aspect of the present invention.

7 is a perspective view showing a power transmission device according to an aspect of the present invention.

8 is a side view showing the power transmission device of FIG.

9 to 11 are side views showing the operation of the power train of FIG.

12 is a perspective view showing the operation of the power train of FIG.

13 is a perspective view showing a refrigerator according to another aspect of the present invention.

FIG. 14 is a perspective view illustrating the groove bar door of FIG. 13; FIG.

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

100: power transmission device 110: drive shaft

112, 114: drive gear 120: driven shaft

122 and 124: driven gear 130: motor portion

131: motor body 132: cap

133: thread 134: gearbox

135: output shaft 140: friction

150: dummy member 200: refrigerator

210: main door 215: opening

220: home bar door 225: handle

The present invention relates to a power transmission device and a refrigerator having the same.

In recent years, competition among producers of products such as home appliances, IT devices, and video equipments is intensifying, and consumers prefer products with better performance and functions at the same price. As a result, product producers are demanding more performance and additional functions than their competitors, and consumers are increasingly interested in the automatic switching structure of home appliances and video devices in the background of preference for products with various functions. Has been.

1 and 2 are perspective views showing one embodiment of a power transmission device according to the prior art. 1 and 2, a servo motor was used as a driving source for automatic implementation of a home bar, and a rack and pinion type gear body and link structure were used as a structure for lifting a hinge by transmitting power. In this manner, the manual operation of the user may be difficult because the driving source motor, the rack, the pinion gear, and the link structure do not include a clutch structure capable of disconnecting power.

In addition, the application of expensive servomotors can be a barrier to the realization of actual product production.

Figure 3 is a perspective view showing another embodiment of the power transmission device according to the prior art, Figure 4 is a cross-sectional view showing the power transmission device of FIG. Referring to FIGS. 3 and 4, an LCD automatic opening and closing device of a note PC capable of simultaneously opening and closing at the same time using a friction hinge and a motor is shown.

In this case, automatic and manual can be implemented together.However, if the speed control of the motor is excluded, the operating speed difference may occur due to the difference in load during the up / down operation and the down operation. There is a problem.

The present invention provides a power transmission apparatus and a refrigerator having the same, which can easily change the forward and reverse power transmission ratios during power transmission from a driving source through a mechanical structure.

According to an aspect of the invention, the motor unit for providing power; A drive shaft connected to the motor unit to receive power and capable of translating in the longitudinal direction; First and second drive gears formed on the outer circumferential surface of the drive shaft at predetermined intervals; A driven shaft disposed adjacent to the drive shaft; A first driven gear formed on an outer circumferential surface of the driven shaft to engage with the first drive gear; And a second driven gear formed on an outer circumferential surface of the driven shaft so as to be engaged with the second drive gear.

In addition, according to another aspect of the invention, the main door is formed with an opening; A groove bar door coupled to the main door to open and close the opening; A motor unit supported by the main door to provide power; A drive shaft connected to the motor unit to receive power and capable of translating in the longitudinal direction; First and second drive gears formed on the outer circumferential surface of the drive shaft at predetermined intervals; A driven shaft disposed adjacent to the drive shaft and connected to the home bar door to transmit power; A first driven gear formed on an outer circumferential surface of the driven shaft to engage with the first drive gear; And a second driven gear formed on an outer circumferential surface of the driven shaft to be engaged with the second drive gear.

The distance between the first drive gear and the second drive gear may be smaller than the distance between the first driven gear and the second driven gear, wherein the inner distance between the first driven gear and the second driven gear is the first. It may correspond to the outer distance between the drive gear and the second drive gear.

In addition, a first threaded portion may be formed on one side of the motor portion, a groove may be formed on the drive shaft to insert one side of the motor portion, and a second threaded portion corresponding to the first threaded portion may be formed on the inner wall of the drive shaft.

In this case, the length of the second threaded portion may correspond to a difference between the distance between the first driven gear and the second driven gear and the distance between the first drive gear and the second drive gear.

On the other hand, the output shaft is formed on the other side of the motor portion, the friction hinge may be coupled to the output shaft. At this time, the friction member may be coupled to the dummy member.

The size of the first drive gear and the second drive gear may be different.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

Hereinafter, a preferred embodiment of a power transmission device and a refrigerator having the same according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals. And duplicate description thereof will be omitted.

5 and 6 are perspective views showing the operation of the power transmission device according to an aspect of the present invention, Figure 7 is a perspective view showing a power transmission device according to an aspect of the present invention, Figure 8 is a power transmission device of Figure 7 It is a side view which shows. 5 to 8, the power transmission device 100, the drive shaft 110, the drive gear 112, the driven shaft 120, the driven gear, the motor unit 130, the motor body 131, and the cap ( 132, a thread, a gearbox 134, an output shaft 135, a friction hinge 140, a dummy member 150, a groove bar door 220, and a handle 225 are illustrated.

The power transmission device 100 according to the present embodiment is a means for automatic opening and closing of a large household appliance, a notebook computer or an image device. In such automatic opening and closing, the object is lowered in the direction of gravity when the downward motion (reverse direction) is performed as shown in FIG. 5, but gravity is decreased when the upward motion (forward direction) is performed as shown in FIG. 6. The object should be lifted in the direction that it goes against.

At this time, since the power transmission device 100 for rotating the object is located at the end of the object, the load applied to the power transmission device 100 during the upward motion is quite large. Such a large load causes a speed difference between the downward motion and the upward motion, and this speed difference may cause a deterioration of the merchandise.

In addition, when the power transmission device is composed of only a motor and a gear, the structure of the designed power transmission device must be specialized for a specific product, and if the model is changed and the weight of the object changes, the power transmission device needs to be redesigned. You can also

The structure of the power train 100 for solving these problems is shown in FIG.

The drive shaft 110 may receive a power from the motor unit 130 as a power source and transmit the power to the driven shaft 120. To this end, drive gears 112 and 114 may be formed on the outer circumferential surface of the drive shaft 110. The driving gears may have a plurality of different sizes, and the driving gears 112 and 114 may be spaced apart from each other by a predetermined interval. In this embodiment, the drive shaft 110 having two drive gears 112 and 114 having different sizes is presented. By varying the size of the drive gear (112, 114), it is possible to change the size and speed of the power transmitted by the drive gear in accordance with the engagement state.

The driven shaft 120 may be disposed in parallel with the driving shaft 110 adjacent to the driving shaft 110. The driven shaft 120 is a means for transmitting the power received from the drive shaft 110 to an object such as the home bar door 220 so that the object can rotate. On the outer circumferential surface of the driven shaft 120, driven gears 122 and 124 that can be engaged with the drive gears 112 and 114 may be formed, and a plurality of driven gears may also be formed. Each driven gear 122 and 124 may be spaced apart from each other by a predetermined interval. In this embodiment, two driven gears 122 and 124 are provided to present the driven shaft 120.

In this case, the distance between the drive gears 112 and 114 may be smaller than the distance between the driven gears 122 and 124, and the drive shaft 110 may translate in the longitudinal direction. As described above, the drive shaft 110 translates in the state where the plurality of drive gears 112 and 114 and the driven gears 122 and 124 are formed on the drive shaft 110 and the driven shaft 120, respectively. It is possible to change the engagement state between the drive gear and the driven gear by reciprocating between the left and right side driven gear (122,124). This may change the size and speed of the power transmitted.

In addition, the inner distance d1 between the driven gears 122 and 124 may correspond to the outer distance d2 'between the drive gears 112 and 114. That is, the distance between the surfaces of the driven gears 122 and 124 facing each other and the distance between the drive gears 112 and 114 including the thickness may be substantially the same. Through this structure, it is possible to prevent the situation where the engagement between the drive gear and the driven gear is released. Substantially the same here means taking into account the tolerances.

The motor unit 130 is a means for generating power and transmitting it to the drive shaft 110 described above. In the present embodiment, as the motor unit 130, the motor body 131, the cap 132 on which the threaded portion 133 is formed, the gear box 134, and the output shaft 135 are presented.

The motor body 131 may be connected to the drive shaft 110 to transmit power to the drive shaft 110. In this embodiment, a method of forming a groove (not shown) in the drive shaft 110 and inserting the motor body 131 into the groove (not shown) by the method.

On the other hand, as described above, the drive shaft 110 may perform a translational movement, the cap 132 having a threaded portion 133 formed on the outer circumferential surface may be coupled to the motor body 131. As the motor body 131 is inserted into the groove (not shown), the cap 132 may also be inserted into the groove (not shown). In this case, the cap 132 may also be inserted into the inner wall of the drive shaft 110 formed by the groove (not shown). A threaded portion (not shown) is formed so that the cap 132 and the drive shaft 110 may be screwed.

In this embodiment, the cap 132 is coupled to the motor body 131, but the motor body 131 and the cap 132 may be integrally formed, and the threaded portion may be provided on the motor body 131 itself. Of course, 133 may be formed directly.

When the motor unit 130 is operated while the output shaft 135 of the motor unit 130 is supported, the motor body 131 and the cap 132 are rotated so that the drive shaft 110 has a length. Translation can be done in the direction. The movement direction of the drive shaft 110 may vary depending on the rotation direction of the motor unit 130.

At this time, the threaded portion (not shown) formed on the inner wall of the drive shaft 110 may be formed by a length corresponding to the difference between the distance (d1) between the driven gear and the distance (d2) between the drive gear. That is, the linear length of the threaded portion (not shown) formed on the inner wall of the drive shaft 110 may be substantially the same as the difference between the distance d1 between the driven gear and the distance d2 between the drive gear. Substantially the same here means taking into account the tolerances.

Since the drive shaft 110 can perform a translational movement by the length of the threaded portion (not shown) formed on the inner wall of the drive shaft 110, the length of the threaded portion (not shown) between the distance (d1) between the driven gear and the drive gear By designing substantially the same as the difference of the distance (d2) of the drive gear 110, the drive gear and the driven gear can be engaged when the translational motion of the drive shaft 110 reaches the limit. A more detailed description thereof will be made later while explaining the operation of the power transmission device 100 according to the present embodiment.

Meanwhile, the gear box 134 is coupled to the motor body 131 according to the present embodiment, and the output shaft 135 may be exposed through the gear box 134. When the motor unit 130 is operated, the output shaft 135 and the motor body 131 makes a relative rotational motion. In this embodiment, the output shaft 135 is supported and fixed to rotate the motor body 131. Show how to use exercise.

In this case, the friction hinge 140 may be coupled to the output shaft 135. When an external force or the like of the user is provided to the power transmission device 100 according to the present embodiment, for example, when the user manually opens or closes the home bar door 220 using the handle 225, the motor may fail. There is concern. In order to solve this problem, the friction hinge 140 is coupled to the output shaft 135 to prepare for manual operation.

That is, during the automatic operation, the friction does not occur in the friction hinge 140 so that the smooth operation can be performed, and during the manual operation, the slip occurs in the friction hinge 140 to prevent the external force from being applied to the motor to protect the motor. You can do it.

Meanwhile, the dummy member 150 may be coupled to the friction hinge 140. The dummy member 150 may allow the output shaft 135 and the friction hinge 140 to be efficiently coupled to a product to which the power transmission device 100 according to the present embodiment (for example, the refrigerator 200) is applied. It is a means to improve the assembly.

The structure of the power transmission device 100 according to an aspect of the present invention has been described above. Hereinafter, the operation of the power transmission device 100 described above with reference to FIGS. 9 to 14 will be described.

9 to 11 are side views illustrating the operation of the power transmission apparatus 100 of FIG. 7, and FIG. 12 is a perspective view illustrating the operation of the power transmission apparatus 100 of FIG. 7. 9 to 12, the power transmission device 100, the drive shaft 110, the drive gears 112 and 114, the driven shaft 120, the driven gears 122 and 124, the motor unit 130, and the motor body 131. The cap 132, the thread 133, the gear box 134, the output shaft 135, the friction hinge 140, the dummy member 150, the groove bar door 220, and the handle 225 are illustrated.

As shown in FIG. 9, when the motor unit 130 rotates forward (clockwise), the drive shaft 110 moves to the right by a screw coupling between the cap 132 and the drive shaft 110. The right drive gear 114 and the right driven gear 124 are engaged. At this time, since the drive shaft 110 can be moved by the length of the threaded portion (not shown) formed on the drive shaft 110, the length of the threaded portion (not shown) is the distance between the driven gear (d1 in Fig. 8) By substantially equal to the difference between the distance between the drive gear and the driving gear (d2 in FIG. 8), it is possible to easily implement the engagement between the right drive gear 114 and the right driven gear 124.

When the motor 130 continues to rotate forward in the engaged state, the friction force between the drive shaft 110 and the cap 132 becomes infinity so that the drive shaft 110 can no longer be translated, so that the drive shaft ( 110 is a normal rotational movement. The rotational movement of the drive shaft 110 is transmitted to the driven shaft 120 through the right drive gear 114 and the right driven gear 124.

In this state, when the motor 130 rotates in the reverse direction (counterclockwise), the drive shaft 110 moves to the left side by a screw coupling between the cap 132 and the drive shaft 110. At this time, the drive shaft 110 may be rotated to some extent, but the normal rotational movement is not performed by the resistance due to the load of the object such as the groove bar door 220, and the like.

10 shows a state in which the translational movement, and FIG. 11 shows a state in which the translational movement has been completed. As shown in FIG. 10, the inner distance of the driven gear (d1 of FIG. 8) and the outer distance of the driving gear (d2 ′ of FIG. 8) are designed to be substantially the same, whereby the engagement between the drive gear and the driven gear is released. The problem can be solved.

As the drive shaft 110 performs the translational movement to the left side by the reverse rotation of the motor unit 130, the left drive gear 112 and the left driven gear 122 may be engaged as shown in FIG. 11. When such a coupling is made, it is necessary to prevent the drive shaft 110 from further translating in the left direction. Therefore, a stopper (not shown) is formed in the threaded portion (not shown) formed on the inner wall of the drive shaft 110. Can be.

When the drive shaft 110 is no longer translated in the left direction by the stopper (not shown), the friction force between the drive shaft 110 and the cap 132 becomes infinity, so that the drive shaft 110 rotates normally. Will be The rotational movement of the drive shaft 110 is transmitted to the driven shaft 120 through the left drive gear 112 and the left driven gear 122.

In this way, it is possible to change the engagement state of the gears by using the rotation of the motor unit 130, it is also possible to optimize the size and speed of the power transmitted by adjusting the number of teeth of the gear to be engaged. .

The operation described above is illustrated in FIG. 12. When the motor unit 130 rotates, the engagement state of the gear may be changed, and power is transmitted to the driven shaft 120 so that an object such as the home bar door 220 may rotate.

The power transmission device 100 described above may be used to open or close a door of a large household appliance, or to open or close a top plate of a notebook. As an example, with reference to FIGS. 13 and 14, the refrigerator 200 to which the power transmission device 100 described above is applied will be described.

FIG. 13 is a perspective view illustrating a refrigerator 200 according to another aspect of the present invention, and FIG. 14 is a perspective view illustrating the home bar door 220 of FIG. 13. 13 and 14, a power transmission device 100, a refrigerator 200, a main door 210, an opening 215, a home bar door 220, and a handle 225 are illustrated.

In the refrigerator 200 provided with the home bar system, when the home bar door 220 is to be opened and closed automatically, the driven shaft 120 is coupled to one side of the home bar door 220, and the motor is connected to one side of the main door 210. The unit 130 may be combined.

Through this, the home bar door 220 can be divided into a case of opening (downward operation) and a case of closing (upward operation), and thus, the size and speed of the power provided in each case can be adjusted, thereby achieving stable operation. In addition, it is possible to increase the commerciality.

Detailed description of the power transmission device applied to the present embodiment will be replaced with the description of the power transmission device according to an aspect of the present invention described above.

Many embodiments other than the above-described embodiments are within the scope of the claims of the present invention.

According to a preferred embodiment of the present invention as described above, by using the translational motion of a plurality of drive gears, driven gears and drive shafts, it is possible to easily change the forward and reverse power transfer ratio during power transmission from the drive source.

Claims (14)

A motor unit for providing power; A drive shaft connected to the motor unit to receive the power and capable of translating in the longitudinal direction; First and second drive gears formed on the outer circumferential surface of the drive shaft at predetermined intervals; A driven shaft disposed adjacent to the drive shaft; A first driven gear formed on an outer circumferential surface of the driven shaft to be engaged with the first drive gear; And And a second driven gear formed on an outer circumferential surface of the driven shaft to engage with the second drive gear. The method of claim 1, And a distance between the first drive gear and the second drive gear is smaller than a distance between the first driven gear and the second driven gear. The method of claim 2, And an inner distance between the first driven gear and the second driven gear corresponds to an outer distance between the first drive gear and the second drive gear. The method of claim 2, One side of the motor is formed with a first threaded portion, The drive shaft is formed with a groove so that one side of the motor unit is inserted, And a second threaded portion corresponding to the first threaded portion is formed on an inner wall of the drive shaft. The method of claim 4, wherein The length of the second threaded portion, And a difference between a distance between the first driven gear and the second driven gear and a distance between the first drive gear and the second drive gear. The method of claim 4, wherein The output shaft is formed on the other side of the motor unit, And a friction hinge coupled to the output shaft. The method of claim 1, And a size of the first drive gear and the second drive gear is different. A main door formed with an opening; A groove bar door coupled to the main door to open and close the opening; A motor unit supported by the main door to provide power; A drive shaft connected to the motor unit to receive the power and capable of translating in the longitudinal direction; First and second drive gears formed on the outer circumferential surface of the drive shaft at predetermined intervals; A driven shaft disposed adjacent to the drive shaft and connected to the home bar door to transmit power; A first driven gear formed on an outer circumferential surface of the driven shaft to be engaged with the first drive gear; And And a second driven gear formed on an outer circumferential surface of the driven shaft to engage with the second drive gear. The method of claim 8, And a distance between the first drive gear and the second drive gear is smaller than a distance between the first driven gear and the second driven gear. The method of claim 9, And an inner distance between the first driven gear and the second driven gear corresponds to an outer distance between the first drive gear and the second drive gear. The method of claim 9, One side of the motor is formed with a first threaded portion, The drive shaft is formed with a groove so that one side of the motor unit is inserted, And a second threaded portion corresponding to the first threaded portion is formed on an inner wall of the drive shaft. The method of claim 11, The length of the second threaded portion, And a difference between a distance between the first driven gear and the second driven gear and a distance between the first drive gear and the second drive gear. The method of claim 8, The output shaft is formed on the other side of the motor unit, And a friction hinge coupled to the output shaft. The method of claim 8, And a size of the first drive gear and the second drive gear is different.

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