KR20110024347A - Power transmitting apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device, wherein when a rotational force is applied to an input shaft, a rotational force is transmitted to the output shaft, but, on the contrary, when a rotational force is applied to the output shaft, the present invention relates to a power transmission device having a mechanism that blocks the rotational force from being transmitted to the input shaft.

Power transmission, case, stopper

Description

Power transmitting apparatus

The present invention relates to a power transmission device.

The power transmission device transmits a rotational force generated by an electric motor or a user's attraction to an object.

The rotational force is provided in one direction, for example, clockwise or counterclockwise, and the subject makes a linear or rotational motion by the provided rotational force, while the subject moves in a reverse direction due to the reaction force generated from the object's own weight or other causes. There is an active research into the device to block the.

In other words, in a structure in which one end of the power transmission shaft is connected to a drive motor and the object is connected to the other end, the power transmission shaft rotates only in the rotational direction of the drive motor, and the power shaft is caused by reaction force generated from the object. Power units in the form of blocking reverse rotation are widely used in various fields. Examples thereof include a power transmission device used for opening and closing a cover of a vinyl house, a means for opening and closing a window, and the like.

However, the power transmission device widely used in the above fields is mainly applied worm gear, Geneva mechanism. Such a conventional mechanism requires a minimum rotation ratio and has a disadvantage in that the input shaft and the output shaft are hardly arranged on the same line.

In addition, although a mechanism using a ratchet mechanism using a friction force and a coil through ring is applied, there are disadvantages such as deterioration in reliability of operation and occurrence of backlash. That is, there is a disadvantage in that a deviation occurs between a setting position to stop the object and the actual stop position.

An object of the present invention is to provide a power transmission device that has improved the above disadvantages.

In detail, an object of the present invention is to provide a power transmission device for removing a phenomenon in which an object stops after reverse rotation by a backlash at a time when power transmission is stopped, thereby maintaining the object in a stopped state at a position at which power transmission is stopped. do.

In addition, an object of the present invention is to provide a power transmission device for preventing the power transmission shaft from rotating in reverse due to the reaction force generated by the object's own weight or other causes after the power transmission is stopped.

Power transmission device according to an embodiment of the present invention for achieving the above object is coupled to a fixed surface, the case including a cylindrical sleeve; An output disk rotatably received in the sleeve and having an output portion penetrating the case on one side thereof; An input disk rotatably seated on the other side of the output disk and having an input portion formed on an opposite side of the surface facing the output disk; A cover covering the input disk and fixedly coupled to the case; A plurality of stoppers intervening in the space between the output disk and the sleeve to prevent the output disk from rotating in a direction opposite to the rotational direction of the input disk; And an elastic member which is maintained at both ends in contact with the stopper and provides a restoring force to the stopper.

By the power transmission device according to the embodiment of the present invention constituting the configuration as described above, the planetary gear parts generally provided for power transmission is removed to reduce the volume of the product, there is an effect that the assembly process is simplified. Furthermore, there is an advantage that the manufacturing cost of the product is reduced, and the manufacturing period is shortened.

In addition, by removing the planetary gear parts, there is an advantage that the backlash phenomenon appearing in the gear coupling structure is removed. Therefore, since the movement or rotation of the object is stopped at the same time as the power transmission is stopped, there is an advantage that the object is accurately positioned in the set position.

In addition, the movement of the object in the reverse direction is blocked by the reaction force caused by the weight or other causes of the object at the time when the power transmission is stopped, there is an advantage that the stability is secured.

Hereinafter, a power transmission apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front perspective view of a power transmission device according to an embodiment of the present invention, Figure 2 is a rear perspective view of the power transmission device, Figure 3 is an exploded perspective view of the power transmission device.

1 to 3, the power transmission apparatus 10 according to the embodiment of the present invention includes a case 11, an output disk 12 rotatably provided inside the case 11, and An input disk 15 rotatably seated on an upper surface of the output disk 12 and a cover 16 fastened to an upper surface of the case 11 to cover the output disk 12 and the input disk 15. And a stopper 14 and the output disk placed on an outer circumferential surface of the output disk 12 to block reverse rotation of the output disk 12 (rotation in a direction opposite to the rotation direction of the input disk 14). It includes an elastic member 13 provided on the outer circumferential surface of 12) to provide an elastic force to the stopper 14.

In detail, a plurality of brackets 111 protrude from the bottom edge of the case 11 so that the case 11 is fixed at an arbitrary position, and a fastening hole 112 is formed in the bracket 111. In addition, a cylindrical sleeve 114 extends from the bottom surface of the case 11, and the output disk 12 is accommodated in the sleeve 114. In addition, a plurality of fastening holes 116 are formed on an upper surface of the sleeve 114 and communicate with fastening holes 162 formed at edge portions of the cover 16. A shaft through hole 115 is formed in the center of the bottom surface of the case 11, and an output shaft 125 (see FIG. 4) protruding from the bottom surface of the output disk 12 passes therethrough. And, in order to adjust the rotation torque and the rotation ratio transmitted to the target object connected to the output shaft, the end of the output shaft may be composed of a gear.

In addition, the output disk 12 has a bottom portion 121 having the same diameter as the inner diameter of the sleeve 114, and a ridge portion 122 raised to a predetermined height from the inside of the bottom portion 121. The ridge 122 has a form in which at least four places are gently curved at a predetermined curvature. The bottom 121 of the output disk 12 is circular, and the ridge 122 has a rectangular shape having four or more corners that are smoothly curved, and thus have the following characteristics. That is, the distance between the edge of the bottom 121 and the ridge 122 of the output disk 12 is shortened toward the edge of the ridge 122. Here, the ridge 122 is not necessarily limited to a quadrangle, and a polygonal shape having at least two corners is sufficient.

Meanwhile, the stopper 14 is seated in a space between the side surface of the ridge 122 and the bottom 121. In detail, two stoppers 14 are disposed at corner portions of the ridge 122. In addition, the stopping jaw 126 is extended at a point between adjacent edges of the ridge 122. Therefore, contact of stoppers in adjacent positions does not occur. In addition, the stopper 126 is formed with a guide groove 124 on which the elastic member 13 is seated. In addition, the stoppers 14 disposed at both ends of the elastic member 13 receive a force in a direction away from each other by the elastic force of the elastic member 13. The guide groove 124 may be removed or deformed when other types of elastic members 23 (see FIG. 11) are used.

In addition, an input shaft 151 protrudes from a center of an upper surface of the input disk 15, and a release rib 152 is bent and extended at an edge thereof.

In detail, the input shaft is a portion to which the lever 50 (see FIG. 8), which will be described later, is connected, and becomes an input end providing rotational force. The release rib 152 is a means for releasing the stop state of the stopper 14 sandwiched between the ridge 122 and the inner surface of the sleeve 114 of the case 11. That is, the release rib 152 lies between the ridge 122 side of the output disk 12 and the sleeve 114 of the case 11. In addition, the distance between the edge end of the ridge 122 and the inner circumferential surface of the sleeve 114 is at least equal to the thickness of the release rib, so that the release rib 152 can pass therethrough. The function of the release rib 152 will be described in more detail below with reference to the drawings.

Meanwhile, a plurality of fastening holes 162 are formed at the edge of the cover 16, and the fastening member penetrating the fastening holes 162 is formed on the upper surface of the sleeve 114 of the disk 11. 116). Thus, the cover 16 is fixed to the upper surface of the sleeve 114. A shaft through hole 161 is formed in the center of the cover 16, and the input shaft 151 protruding from the input disk 15 penetrates through the shaft 16.

4 is a rear perspective view of an output disk constituting the power transmission device according to the embodiment of the present invention.

Referring to FIG. 4, an output shaft 125 protrudes from the center of the rear surface of the output disk 12. The output shaft 125 penetrates through the shaft through hole 115 of the case 11 and is exposed to the outside. In addition, the object is directly or indirectly connected to the output shaft 125 so that the rotation force provided through the input shaft 151 is transmitted to the object. The end of the output shaft 125 may be formed in a gear shape for smooth power transmission.

Figure 5 is a perspective view showing a state in which the cover is removed, the power transmission device according to an embodiment of the present invention, Figure 6 is a perspective view showing a state in which the cover and the case is removed, Figure 7 is removed the cover Top view of the power transmission device in a closed state.

5 and 6, as described above, the stopper 14 is located between the ridge 122 side of the output disk 12 and the inner circumferential surface of the sleeve 114 of the case 11. In the state where the rotation force is not provided to the input shaft 151, the stopper 14 is strongly sandwiched between the ridge 122 and the inner circumferential surface of the sleeve 114 by the elastic force of the elastic member 13. maintain. In this state, when the input disk 15 rotates, the stopper 14 is pushed by the release rib 152 to release the contact state between the ridge 122 and the sleeve 114. In addition, the input disk 15 and the output disk 12 is rotated in one body, the rotational force is transmitted to the output shaft 125.

Referring to FIG. 7, the release rib 152 may swing in the free section a without power transmission. That is, in the free period a, power transmitted through the input shaft 151 is not transmitted to the output disk 12, and only the input disk 15 may move.

8 is a view schematically showing an application example of a power unit according to an embodiment of the present invention.

Referring to FIG. 8, the lever 50 is connected to the input shaft 151 of the power unit 10, and the target object M may be directly or indirectly connected to the output shaft 152.

In this embodiment, a separate power transmission shaft is connected to the output shaft 152, a rope is wound around the outer circumferential surface of the power transmission shaft, and the target object M is connected to the end of the rope. The target object M may be a door for opening and closing, a window, a shutter, a curtain, a screen, or a vinyl house cover.

As shown in the drawing, when the lever 50 is grasped and turned clockwise or counterclockwise, the target object M moves up or down. In addition, an electric motor may be connected to the input shaft 151.

9 is a view showing the operation of the power transmission device according to an embodiment of the present invention, it shows a state when the input shaft is rotated forward.

Here, the rotation in the forward direction is defined as meaning to rotate in the clockwise direction on the drawing.

Referring to FIG. 9, as mentioned above, since the ridge of the output disk 12 has a rectangular shape in which the edge is smoothly curved, the sleeve of the case 11 toward the edge of the ridge 122 is formed. 114, the space b between the ridge 122 becomes narrow. If the bottom portion of the output disk 12 on which the stopper is placed is defined as the stopper receiver 127, the stopper receiver 127 may be divided into two regions. That is, the left side of the drawing is an extension part based on a line connecting a point at which the stopper 14 is in contact with the sleeve 114 and a point at which the side of the stopper 14 is in contact with the ridge 122. (E), the right side may be defined by the reduction unit (N).

In detail, when the stopper 14 moves toward the expansion part E, the frictional force acting on the outer circumferential surface of the stopper 14 is removed, and when the stopper 14 moves toward the reduction part N, the frictional force increases. The elastic member 13 may be a spring having a restoring force F1 acting outward. In addition, in a state in which no external force is applied to the power transmission device 10, two adjacent stoppers 14 remain in a state of receiving a force toward the reduction portion N by the restoring force of the elastic member 13. do. That is, the stopper 14 is held between the sleeve 114 and the ridge 122 to remain in a non-moving state.

In this state, when the rotational force is supplied through the input shaft 151, the release rib 152 of the input disk 15 is independently by a predetermined distance (L1) until contact with the left stopper 14 in the drawing. Rotate Then, from the moment the release rib 152 contacts the stopper 14, the stopper 14 further rotates by a predetermined distance L2 until the stopper 14 contacts the stopper 126. Then, the center of the left stopper 14 is moved from C1 to C2. The compression force acts on the elastic member 13 while the stopper 14 on the left side moves from C1 to C2, and the compression force is transmitted to the stopper 14 on the right side. And, such a force acts as a frictional force on the outer peripheral surface of the stopper 14 on the right side.

In this state, as the rotational force provided to the input shaft 15 increases, the release rib 152 pushes the stopper 14 on the left side, and the stopper 14 on the left side lifts the stopper 126. Pushed. As a result, the output disk 12 rotates clockwise by the force transmitted to the input shaft 152. Then, as the output disk 12 rotates in the clockwise direction, the expansion part E region moves in the clockwise direction. Then, the stopper 14 on the right side may reduce the frictional force between the side of the sleeve 114 and the ridge 122 or release the contact state. That is, the center of the right stopper 14 is moved finely (C3-> C4). In addition, a compressive force is accumulated in the elastic member 13. Thus, the input disk 15 and the output disk 12 is rotated in one body, the rotational force is transmitted to the output shaft 125.

On the other hand, when the rotational force provided to the input shaft 151 is removed, the restoring force against the compressive force accumulated in the elastic member 13 is transmitted to the stopper 14 in contact with both ends of the elastic member. Then, the pair of stoppers 14 are moved away from each other, that is, toward the reduction portion N. Then, the stoppers 14 are strongly sandwiched between the inner circumferential surface of the sleeve 114 of the case 11 and the side surface of the ridge 122 of the output disk 12. As a result, the output disk 12 is prevented from rotating in the reverse direction, that is, counterclockwise, so that no backlash occurs.

Here, consider the case where the following phenomenon occurs. For example, it corresponds to a process of lifting a shutter that shields an entrance.

(i) When the output disk 12 tries to rotate in the reverse direction (counterclockwise) because the moment due to the weight of the target object M is greater than the rotational force provided to the input disk 15.

(ii) At the moment when the rotational force acting on the input disk 15 is removed, the phenomenon that the output disk 12 tries to rotate in the reverse direction (counterclockwise) due to the moment due to the weight of the target object M If it happens.

In the above two cases, if only the output disk 12 is rotated counterclockwise while the case 11 is fixed, the stopper 14 on the right side moves to the narrowing portion N which becomes narrower. Results. That is, as soon as the output disk 12 rotates in reverse, the stopper 127 contacts the inner circumferential surface of the sleeve 11 of the case 11 and the side surface of the ridge 122 of the output disk 12 so that friction force is increased. Will occur. As the reverse rotational force acting on the output disk 12 increases, the frictional force generated on the outer circumferential surface of the stopper 14 increases, so that the reverse rotation of the output disk 12 becomes impossible. As a result, the output disk 12 rotates only in the rotational direction of the input disk 15, and the backlash phenomenon of the output disk 12 is essentially blocked.

FIG. 10 is a view illustrating a situation opposite to the example of FIG. 9, and illustrates an example in which the input shaft rotates in the reverse direction. For example, if the door is closed by lowering the shutter.

In detail, the operation of the stopper 14 and the output disk 12 according to the rotation of the input disk 15 is applied the same principle as described in Figure 9, except that the direction of action of the force is reversed.

On the other hand, suppose that the moment due to the weight of the target object M acts on the output disk 12 while the input disk 15 is rotated counterclockwise at _a speed of Va.

First, if the rotational force of the input disk 15 is greater than the moment due to the weight of the target object (M), it will comply with the principle described in Figure 9 will not need a separate description.

Second, when the moment due to the weight of the target object (M) is greater than the rotational force of the input disk 15, that is, the rotational speed of the output disk 12 than the rotational speed (V _a ) of the input disk 15 Consider the case where (V _b ) is greater.

If the rotational speed V _b of the output disk 12 is greater than the rotational speed V _a of the input disk 15, the stopper 15 on the right side is based on the principle of relative movement and the restoring force of the elastic member 13. Will move clockwise. Then, the stopper 15 on the right side is moved toward the reduction portion N, and is caught on the side of the sleeve 114 and the ridge 122. Then, counterclockwise movement of the output disk 12 will be blocked by the frictional force. Therefore, during the rotational force acting on the input disk 15, the phenomenon that the target object falls rapidly due to the weight of the target object M is prevented, and as a result, stability in use is secured.

11 is a view showing the components of the power transmission device according to another embodiment of the present invention.

Referring to Fig. 11, in addition to the spring-shaped elastic member shown in the previous embodiment, a V-type or W-type torsion spring 23 as shown may be provided.

In detail, a groove sized to insert the end of the torsion spring 23 is formed in the upper surface of the stopper (14). Then, elastic force acts in the direction in which both ends of the torsion spring 23 are opened. That is, when a force is applied to both ends of the torsion spring 23 closer to each other, a restoring force is accumulated in the torsion spring 23, and such restoring force is transmitted to the stopper 14.

1 is a front perspective view of a power transmission device according to an embodiment of the present invention.

2 is a rear perspective view of the power transmission device;

3 is an exploded perspective view of the power transmission device;

4 is a rear perspective view of an output disk constituting the power transmission device according to the embodiment of the present invention.

5 is a perspective view showing a state in which the cover is removed in the power transmission device according to an embodiment of the present invention.

Figure 6 is a perspective view showing a state in which the cover and the case is removed.

7 is a plan view of the power transmission device with the cover removed;

8 is a view schematically showing an application example of a power unit according to an embodiment of the present invention.

9 is a view showing the operation of the power transmission device according to an embodiment of the present invention, an operating state diagram showing the state when the input shaft rotates forward.

FIG. 10 is a view for explaining a situation opposite to the example of FIG. 9, and showing an operation state when the input shaft rotates in the reverse direction. FIG.

11 illustrates components of a power transmission device according to another embodiment of the present invention.

Claims (11)

A case coupled to the fixed surface, the case including a cylindrical sleeve; An output disk rotatably received in the sleeve and having an output portion penetrating the case on one side thereof; An input disk rotatably seated on the other side of the output disk and having an input portion formed on an opposite side of the surface facing the output disk; A cover covering the input disk and fixedly coupled to the case; A plurality of stoppers intervening in the space between the output disk and the sleeve to prevent the output disk from rotating in a direction opposite to the rotational direction of the input disk; And And an elastic member, wherein both ends remain in contact with the stopper and provide a restoring force to the stopper. The method of claim 1, And a release rib formed on an outer circumferential surface of the input disk and extending into a space in which the stopper is accommodated. The method of claim 2, And the contact between the side surface of the sleeve and the output disk and the stopper is released by the movement of the release rib according to the rotation of the input disk. The method of claim 2, The other side of the output disk protrudes a polygonal ridge having at least two corners, And the distance between the end of the corner and the inner circumferential surface of the sleeve is at least the thickness of the release rib. The method of claim 4, wherein The stopper lies in a space between the ridge and the sleeve, Power stop device extending radially from the side of said ridge to bisect an area between adjacent corners. The method of claim 5, And the stopper lies in a space between the corner and the stop. The method of claim 4, wherein The distance between the ridge side and the inner peripheral surface of the sleeve is shorter toward the corner, characterized in that the power transmission device. The method of claim 5, The elastic member, A power transmission device, characterized in that placed on the recessed portion from the upper surface of the stop, the two stoppers adjacent to each other with the stop in between exert an elastic force in a direction away from each other. The method of claim 5, The elastic member, Both ends are fitted to the upper surfaces of two stoppers adjacent to each other with the stopper therebetween, And the two stoppers are torsion springs having a V or W shape in which elastic force acts in a direction away from each other. The method of claim 5, And the input disc and the output disc rotate in one body from the moment when some of the stoppers come into contact with the stop by the movement of the release rib according to the rotation of the input disc. . The method of claim 4, wherein The moment the rotational speed of the output disk by the rotational force acting on the output disk exceeds the rotational speed of the input disk, The stopper moves toward an edge of the ridge, And a frictional force generated by contacting the side surface of the ridge and the inner circumferential surface of the sleeve.

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