KR100970707B1 - apparatus for preventing backlashing - Google Patents

Abstract

The present invention relates to a device for preventing the reverse rotation of the rotating shaft by an external force, etc. when the rotational force is not applied to the rotating shaft, in particular, to prevent the reverse rotation automatically without the user's intervention, the contact portion at high speed rotation It relates to a reverse rotation prevention device that prevents at all.

To this end, the present invention is a rotating shaft coupled to the drive shaft, the drive shaft is rotated, the coupling body including a cylindrical portion provided with a sliding pin moving in the direction of gravity at the stop or low speed rotation toward the rotation axis of the drive shaft and does not rotate It is fixed so that the present invention provides an anti-rotation device, characterized in that the inner fixing body including a stopper portion is formed on the outer circumferential surface of the locking groove is inserted into the sliding pin to limit the rotation direction according to the rotation direction of the drive shaft.

Reverse rotation, axial, prevent

Description

Reverse rotation prevention device {apparatus for preventing backlashing}

The present invention relates to a device for preventing the reverse rotation of the rotating shaft by an external force, etc. when the rotational force is not applied to the rotating shaft, in particular, to prevent the reverse rotation automatically without the user's intervention, the contact portion at high speed rotation It relates to a reverse rotation prevention device that prevents at all.

Rotational force by electric motor or actuator motor is widely used as a means of transmitting power in various mechanical fields, and due to the mechanical properties used, the direction opposite to the intended rotational direction (hereinafter referred to as forward rotation) by the user (hereinafter referred to as "rotational rotation") (Reverse rotation, etc.) is often rendered inoperable or serious damage to the durability of the machine.

As an example, Fig. 1 shows an exhaust device by a blower.

At this time, the exhaust device is to rotate the impeller with the rotational force obtained from the motor to discharge the gas containing toxic gas, hot air, cold air, etc. in a specific space to the outside through the duct. In a device, a factory, etc., in which the exhaust of the gas is important, an extra spare blower is provided in the same duct in preparation for a blower failure, and FIG. 1 shows a main blower composed of a main motor 11 and a main impeller 12 connected thereto. 10) and a preliminary blower 20 composed of a preliminary motor 21 and a preliminary impeller 22 connected thereto is briefly shown in a configuration in which the preliminary blower 20 is connected to the same duct D.

Each of the motors 11 and 21 and the impellers 12 and 22 are connected to each drive shaft, and the main blower 10 is normally operated to discharge the indoor gas to the outside O. At this time, as the gas moved by the main blower 10 flows back toward the preliminary blower 20, the preliminary impeller 22 in a state where the power is cut off is reversed.

At this time, if the main blower 10 suddenly stops operation due to a failure or the like, the spare motor 21 is operated by the system 30 or a user's operation to have a continuous exhaust.

In this case, since the auxiliary impeller 22 which is reversely rotated by the main blower is reversely rotated for a predetermined time due to the rotational inertia even when the operation of the main blower is stopped, the drive shaft 23 when the sudden forward rotation is added to the spare motor. Torsional shock is applied to the This torsional shock is very large in the case of a large blower, which causes the vibration of the drive shaft 23 to damage the bearings, couplings, and the like wrapped around the drive shaft, thereby shortening the life of the preliminary blower 20.

In order to prevent this, the driving shaft of the preliminary blower is provided with a preventing device 40 for preventing the reverse rotation of the preliminary impeller. For example, Korean Utility Model Registration No. 224972 is provided with a regenerative stopper and a ratchet gear operated by a solenoid. A device is described in which the engagement and brake linings hold the shaft and prevent reverse rotation.

This conventional technique has a problem that the installation cost is very expensive and difficult to be widely utilized as the device uses a separate external power and has a complicated configuration.

The present invention has been made to solve the above-described problem, the embodiment of the present invention has an object to automatically prevent the reverse rotation of the drive shaft while having a simple structure without a separate power supply.

Specifically, it has the purpose of preventing the reverse rotation of the drive shaft by using the centrifugal force obtained by the gravity and the rotation of the drive shaft.

It also has the purpose of making it possible to minimize the loss of the driving force during forward rotation.

In addition, the high-speed forward rotation of the drive shaft has a purpose to minimize the loss of rotation force by being spaced apart so as not to cause friction.

It also has the purpose of making it possible to easily set minute spacing of the reverse rotation prevention device.

In addition, it is possible not only to prevent reverse rotation at the end of the drive shaft, but also to prevent the reverse rotation by being coupled to the middle of the drive shaft by a simple structure change, so that it can be used universally in a device having an installed drive shaft. Have

In order to solve the above problems, the present invention is a coupler including a cylindrical portion provided with a driving shaft that rotates in combination with the driving shaft, the sliding pin is rotated in the direction of gravity during stop or low-speed rotation toward the rotation axis of the drive shaft in an embodiment It is fixed so as not to rotate the ring body, and the inner rotation body is provided with a stopper portion is formed on the outer circumferential surface of the locking groove is inserted into the sliding pin to limit the rotation direction in accordance with the rotation direction of the drive shaft is provided Present prevention measures.

In addition, the locking groove is characterized in that the vertical surface is formed vertically toward the center of the circle formed by the cross section of the cylindrical stopper portion, and the vertical surface is provided with a smooth bottom surface gradually increasing the slope to the outer peripheral surface of the stopper portion Present reverse rotation prevention device.

In addition, the inner fixing body, the support plate extending from one end of the stopper portion, and one end is firmly coupled to the structure to prevent rotation, the other end is fixed to the side of the support plate is further provided with a fixing bracket Present a reverse rotation prevention device.

In addition, the cylindrical part has a plurality of through holes provided in a direction toward the rotating shaft so that the sliding pins shorter than the thickness of the cylindrical part are freely lifted and the sliding holes are separated from the through holes in contact with the outer circumferential surface of the cylindrical part. It proposes a reverse rotation prevention device characterized in that the closing member is prevented.

In addition, a horizontal hole is formed in the cylindrical portion along the direction of the rotation axis, and one end of the length member is inserted into the support plate so as to adjust an installation interval of the inner fixing body by a length member inserted into the horizontal hole. It proposes a reverse rotation prevention device characterized in that the depth groove is formed.

In addition, the center of the inner fixing body provides a reverse rotation prevention device characterized in that the through-hole through which the drive shaft rotatably passes is further formed.

According to the reverse rotation prevention apparatus according to an embodiment of the present invention as described above, as the sliding pin is moved by gravity, and is configured to be caught during reverse rotation by the shape of the locking groove, a separate driving force is required to prevent the reverse rotation. There is no effect, the user does not need to be involved in order to release the drive automatically.

In addition, the bottom surface of the engaging groove has an effect that can be smoothly rotated by preventing the degradation of the rotational force by the sliding pin during the forward rotation, as having a gently increasing slope.

In addition, when the forward rotation is made at a high speed, since the sliding pin is located inside the coupling body and is not in contact with the inner fixing body, there is no waste of rotational force of the rotating drive shaft, and noise and vibration are not caused by contact. .

On the other hand, by using the horizontal hole, the depth groove and the length member has an effect that can easily set the axial spacing between the coupling body and the inner fixing body and the installation spacing between the cylindrical portion and the stopper portion for the sliding pin to operate.

In addition, when the through hole is further formed in the inner fixing body, the reverse rotation prevention device can be installed in the middle of the drive shaft, so that it can be used in addition to an existing facility, thereby increasing the versatility.

Hereinafter, the function, configuration and operation of the reverse rotation prevention device of the present invention through the preferred embodiment of the accompanying drawings will be described in detail.

2 is an exploded perspective view of the reverse rotation prevention device according to an embodiment of the present invention.

In the reverse rotation prevention device 1 according to the preferred embodiment of the present invention, the driving shaft 100 rotates, the coupling body 200 which is coupled to the driving shaft and is fixed so as not to rotate, and is spaced apart from the coupling body. The inner fixing body 300 is provided.

3A and 3B, the coupling body 200 is provided with a sliding pin 211 that moves in the direction of gravity when stopped or rotates at low speed toward the rotation axis A of the drive shaft 100. Cylindrical portion 210 is included.

One end of the coupling body 200 is coupled to the drive shaft 100 and a conventional key groove and a key, so that the coupling body also rotates when the drive shaft is rotated. At this time, the cylindrical portion 210 constituting part of the coupling body has a hollow cylindrical shape, the center of which is the same as the rotation axis (A) of the drive shaft.

On the other hand, the sliding pin 211 is a substantially long cylindrical member is provided in the cylindrical portion 210 so that the longitudinal direction toward the rotation axis. In addition, the sliding pin 211 is freely slidable along its longitudinal direction, such that the cylindrical portion 210 is slid in the direction of gravity by gravity when stationary or at low speed rotation.

That is, if the centrifugal force acting on the sliding pin 211 is smaller than gravity as the cylindrical portion 210 is stopped or rotates slowly, when the sliding pin 211 is positioned on the upper portion of the cylindrical portion, It is moved toward.

That is, as the sliding pin 211 located above the cylindrical portion is moved downward by gravity, the sliding pin protrudes to the inner circumferential surface 210a of the cylindrical portion 210. One end of the protruding sliding pin comes into contact with the stopper portion of the inner fixing body described next.

On the other hand, Figure 4a is a side cross-sectional view of the inner fixing body employed in the reverse rotation prevention device shown in Figure 2, Figure 4b is a front view of the inner fixing body employed in the reverse rotation prevention device shown in FIG.

The inner fixing body 300 includes a stopper part 310 having a locking groove 311 formed on an outer circumferential surface of the sliding pin 211 in which the sliding pin 211 is fitted according to the rotational direction of the drive shaft 100.

At this time, the stopper portion 310 has a cylindrical shape spaced apart from the inner circumferential surface of the cylindrical portion, the center of the stopper portion 310 is located on the rotation axis (A) of the cylindrical portion.

In addition, the outer circumferential surface of the stopper portion 310 is formed with a latching groove-shaped locking groove 311, so that the sliding pin moved to the inside of the cylindrical portion as described above can be located in the lower portion of the ratchet gear.

At this time, one side of the thread of the ratchet gear is formed smoothly, the neighboring surface is formed in a steep inclination in accordance with the direction of rotation of the cylindrical portion, when the forward rotation, the gentle surface is the sliding pin back to the inside of the cylindrical portion Forward rotation is made while pushing, in the case of reverse rotation, the sliding pin is in contact with the ratchet gear in a steep slope is configured to prevent the cylindrical portion from rotating.

At this time, the sliding pin 211 and the locking groove 311 in accordance with the rotation direction to ensure that the action is made precisely, the locking groove 311 is formed vertically toward the center of the circle formed by the cross section of the stopper portion 310 having a cylindrical shape It is preferable that the vertical surface 311a and the bottom surface 311b gently connected to the outer circumferential surface of the stopper portion in the vertical surface.

That is, the vertical surface 311a, which would have been moved to the lower end of the locking groove 311, is in contact with the side surface of the sliding pin, and there is no force acting in the direction of moving the sliding pin upward, thereby inverting the cylindrical portion. Suppression of rotation is made accurately.

On the other hand, the bottom surface (311b) extending from the inside of the vertical surface (311a) is formed to be gently connected to the outer peripheral surface of the stopper 310, the sliding pin can be moved into the cylindrical portion.

At this time, the bottom surface 311b is a portion immediately following the vertical surface 311a, and a parallel bottom surface 311c parallel to the outer circumferential surface of the virtual cylinder having the same center as the center of the stopper portion 310, and the parallel bottom surface ( 311c), the inclination is gradually increased to form the inclined bottom surface 311d reaching the outer circumferential surface of the stopper portion 310 having a cylindrical shape.

In this case, when the forward rotation is made in a situation that the side of the sliding pin in contact with the vertical surface 311a, there is no force applied to the side except for the frictional force at the end of the sliding pin in contact with the parallel bottom 311c. By the sliding of the sliding pin is made smoothly.

Then, the sliding pin is moved along the inclined bottom surface 311d gradually increasing inclined, so that the forward rotation of the cylindrical portion proceeds naturally.

In addition, the inclined bottom surface 311d reaches the outer circumferential surface of the cylindrical portion to reduce the inclination again, thereby forming a more gentle curve.

In this case, as the inclination decreases again at the end of the inclined bottom surface 311d, a sudden impact is not applied to the release of the sliding pin, so that the sliding pin is smoothly moved to further improve noise and durability.

On the other hand, the inner fixing body 300, the support plate 320 extending from one end of the stopper portion 310, and one end is firmly coupled to the structure (B) to prevent rotation, the other end is the support plate 320 Fixing bracket 330 is fixed to the side of the may be further provided.

At this time, the support plate 320 is a substantially disk-shaped extending from one end of the stopper portion 310, the diameter is formed larger than the diameter of the stopper portion.

In addition, the fixed bracket 330 is fixed to the structure (B) of the mechanical device, building, etc., the reverse rotation preventing device is installed according to an embodiment of the present invention, the other end is coupled to the side of the support plate 320 stopper The part 310 and the support plate 320 are fixed so as not to rotate.

The fixing bracket 330 is coupled through a support plate and welding, and may be a bent plate shape that is firmly fixed to the structure by bolts or the like, and may be various coupling means for binding the structure and the support plate to each other. .

On the other hand, as shown in Figure 2, the cylindrical portion 210, a plurality of through-holes 212 in the direction toward the rotation axis (A) so that the sliding pin 211 shorter than the thickness of the cylindrical portion is freely lifted up and down. ) Is provided, and a closing member 213 may be coupled to the through hole 212 in contact with the outer circumferential surface 210b of the cylindrical portion 210 to prevent the sliding pin 211 from being separated.

That is, the sliding pin 211 coupled to the cylindrical portion and freely lifting in the direction of gravity may have a configuration that is inserted into the plurality of through holes 212 formed toward the rotation axis of the cylindrical portion, for example.

In this case, the sliding pin 211 has a shorter length than the thickness t from the inner circumferential surface 210a to the outer circumferential surface 210b of the cylindrical portion, and has a sliding pin 211 in the through hole 212 in contact with the outer circumferential surface 210b of the cylindrical portion. ) Is a closing member 213 to prevent the departure from the outside.

As a result, when the through hole is positioned at the lower end of the gravity direction by the rotation of the cylindrical part, the through hole is blocked by the closing member so as not to be separated out.

The finishing member 213 may be made of a band-shaped band (not shown) surrounding the outer circumferential surface of the cylindrical portion, or may be inserted into each through hole and formed as a key for blocking the through hole. At this time, by forming a screw thread on the outer circumferential surface portion of the through hole, it is possible to more tightly block the through hole by combining a conventional bolt.

In addition, as the through hole 212 is provided in plural, any one of the sliding pins positioned at the upper portion of the rotating shaft when the cylindrical portion 210 is stopped is configured to move to the lower side to be caught by the locking groove of the stopper portion, thereby operating. It will be able to increase the reliability of.

On the other hand, Figure 5 is a side cross-sectional view showing a state of use of the reverse rotation prevention device shown in FIG.

The cylindrical portion 210 has a horizontal hole 214 is formed in accordance with the direction of the rotation axis (A), it is possible to adjust the installation interval of the inner fixing body 300 by the length member 214a inserted into the horizontal hole. As such, the support plate 320 may have a depth groove 321 into which one end of the length member 214a is inserted.

That is, the cylindrical portion 210 and the stopper portion 310 are installed in a state in which they are spaced apart from each other. For accurate operation, the spaced intervals, that is, the installation intervals, must be precisely maintained. To this end, the cylindrical portion 210 is provided with a horizontal hole 214 formed along the rotation axis direction, and a depth groove 321 having a constant depth is formed in the support plate 320 on an imaginary extension line of the horizontal hole 214 and is spaced apart. The length member 214a serving as a reference for the interval is fitted.

That is, the length member 214a is inserted into the horizontal hole 214 and the depth groove 321, the length is the length of the horizontal hole 214 of the cylindrical portion 210, and the depth groove formed in the support plate 320 ( The depth of 321 and the coupling body 200 and the inner fixing body 300 have a length in which the axial intervals to be spaced apart are added together.

The length member 214a is first inserted into the horizontal hole 214 of the cylindrical portion coupled with the drive shaft, and in positioning the inner fixing body 300 in the coupling body 200, one end of the length member 214a is deep. By moving the inner fixing body 300 until the bottom of the groove 321 is reached, the axial gap between the coupling body 200 and the inner fixing body 300 is secured.

In addition, at least two or more horizontal holes 214 and depth grooves 321 are formed, and as the plurality of length members 214a are used, the center and the cylindrical portion of the stopper portion 310 provided in the inner fixing body ( Since the center (rotation axis of the drive shaft) of the 210 is naturally matched, the interval between the inner circumferential surface 210a of the cylindrical portion 210 and the outer circumferential surface of the stopper portion 310 is constantly provided.

In this case, by using the horizontal hole, the depth groove, and the length member, the distance between the axis of the coupling body and the inner fixing body and the inner circumferential surface of the cylindrical portion in which the sliding pin moves and the outer circumferential surface of the stopper portion are ensured uniformly. It is done easily.

Of course, the length member is removed after the coupling member and the inner fixing body are installed at precise intervals using the length member.

On the other hand, Figure 6 is a side cross-sectional view showing a state of use of the reverse rotation prevention device according to another embodiment of the present invention.

The reverse rotation prevention device 1 ′ according to another embodiment of the present invention passes through which the drive shaft 100 rotatably passes in the center of the inner fixing body 300 so as to be installed in the middle of the drive shaft 100. The hole 301 may be further formed.

That is, in the middle of the drive shaft 100, the coupling body 200 is fixed to the drive shaft by using the key groove and the key as described above with the inner peripheral surface 210a of the cylindrical portion spaced apart from the drive shaft 100.

In addition, the inner fixing body 300 has a passage hole 301 having a diameter larger than the diameter of the driving shaft 100 is formed in the stopper portion 310 and the support plate 320 to allow the driving shaft to pass.

At this time, the part in which the locking groove 311 of the stopper part 310 is formed is positioned between the driving shaft 100 and the cylindrical portion 210 while maintaining the installation interval by using the above-described length member 214a, the driving shaft The reverse rotation prevention device 1 'is provided in the middle of the 100.

Hereinafter, the configuration, function and action of the other components, such as the sliding pin and the locking groove and the fixing bracket is the same as the reverse rotation prevention device according to the above-described embodiment and the duplicated description is omitted.

Hereinafter will be described the operation of the reverse rotation prevention device according to an embodiment of the present invention.

As the sliding pin 211 slides toward the gravity direction in the through hole 212 while the rotation of the driving shaft 100 is stopped, a part of the sliding pin 211 protrudes from the inner circumferential surface of the cylindrical portion 210.

At this time, when a plurality of through-hole 212 and the sliding pin 211 is provided, when any one of the sliding pin protrudes to the inner peripheral surface of the cylindrical portion in the direction of gravity, the sliding pin on the opposite side is moved to the inside of the cylindrical portion It becomes a state.

Left and right, the end of the sliding pin 211 protruding into the inner circumferential surface of the cylindrical portion 210 is in contact with the outer circumferential surface of the stopper portion 310, when the drive shaft 100 starts to rotate slowly, naturally engaging groove 311 by gravity Will move to the bottom.

At this time, if the drive shaft 100 is reverse rotation, the rotation of the cylindrical portion 210 is stopped by the side surface of the sliding pin 211 is caught on the vertical surface 311a. That is, reverse rotation of the coupling body 200 and the driving shaft 100 including the cylindrical portion 210 is prevented.

If the drive shaft 100 rotates forward, the sliding pin 211 starts to slide on the starting point of the bottom surface 311b having the same center as the rotation shaft, and as the rotation angle increases, the stopper portion 310 increases. It is pushed up against the direction of gravity to the outer peripheral surface of the, and the forward rotation is made.

Thereafter, the sliding pin 211 is moved to the recessed through-hole 212 by gravity according to the rotation of the cylindrical portion 210, the next sliding pin is riding the bottom surface of the locking groove as described above again the stopper portion Moving to the outer circumferential surface is a continuous forward rotation is made.

In addition, when the rotational speed increases as the driving shaft 100 is gradually increased by the motor or the like, the sliding pin 211 located in the cylindrical portion 210 overcomes gravity by centrifugal force, the outer peripheral surface of the cylindrical portion 210 It is moved toward 210b.

That is, as the moving pin is moved in the direction toward the finishing member 213 in the through hole 212, the sliding pin 211 does not come into contact with the inner fixing body 300 when the driving shaft rotates at high speed. .

In this case, since the sliding pin 211 is not in direct contact with the inner fixing body 300 during high speed rotation, there is no consumption of the rotational force of the motor, and in addition, there is no problem of noise and vibration.

Subsequently, if the rotation speed of the drive shaft 100 is lowered after the operation of the motor is stopped, the centrifugal force of the sliding pin 211 is also reduced, and the sliding pin 211 is lifted from the through-hole 212 by gravity again, thereby performing tactical. It will be possible to prevent the reverse rotation.

1 is a schematic diagram briefly showing a state of use of the reverse rotation prevention device according to an embodiment of the present invention.

2 is an exploded perspective view of a reverse rotation prevention device according to an embodiment of the present invention.]

3A is a side cross-sectional view of the coupling body employed in the reverse rotation prevention device shown in FIG. 2.

3B is a front view of the coupling body employed in the reverse rotation prevention device shown in FIG. 2.

Figure 4a is a side cross-sectional view of the inner fixing body employed in the reverse rotation prevention device shown in FIG.

Figure 4b is a front view of the inner fixing body employed in the reverse rotation prevention device shown in FIG.

Figure 4c is an enlarged view of the locking groove of the inner fixing body employed in the reverse rotation prevention device shown in FIG.

Figure 5 is a side cross-sectional view showing a state of use of the reverse rotation prevention device shown in FIG.

Figure 6 is a side cross-sectional view showing a state of use of the anti-rotation device according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1, 1 ′: Prevention device

100: drive shaft A: rotation axis B: structure

200: coupling body

210: cylindrical portion 210a: inner peripheral surface 210b: outer peripheral surface

                        t: thickness

211: sliding pin 212: through hole 213: finishing member

214: horizontal hole 214a: length member

300: inner fixing body 301: through hole

310: stopper portion 311: locking hole 311a: vertical surface

311b: bottom surface

311c: Parallel floor 311d: Inclined floor

320: support plate 321: depth groove

330: fixed bracket

10 main blower 11 main motor 12 main impeller

20: spare blower 21: spare motor 22: spare impeller

23 drive shaft 30 system 40 prevention device

D: Duct O: Outside

Claims (6)

Rotating drive shaft 100; Coupling body including a cylindrical portion 210 is coupled to the drive shaft 100 and rotates, the sliding pin 211 moving in the direction of gravity when the stop or low speed rotation is directed toward the rotation axis (A) of the drive shaft 100 200; And It is fixed not to rotate, the inner side including the stopper portion 310 is formed on the outer circumferential surface of the engaging groove 311 is inserted into the sliding pin 211 to limit the rotation direction in accordance with the rotation direction of the drive shaft 100 Fixed body 300; reverse rotation prevention device characterized in that it is provided. The method of claim 1, wherein the locking groove 311 is A vertical surface 311a vertically formed toward a center of a circle formed by a cross section of the stopper portion 310 having a cylindrical shape, The vertical surface (311a) is a reverse rotation prevention device, characterized in that provided with a gentle bottom surface 311b gradually increasing the slope to the outer peripheral surface of the stopper portion (310). The method of claim 2, wherein the inner fixing body 300, A support plate 320 extending from one end of the stopper part 310; To prevent rotation, one end is firmly coupled to the structure (B), the other end of the reverse rotation prevention device characterized in that the fixing bracket 330 is further provided fixed to the support plate (320). In claim 1, The cylindrical portion 210 is provided with a plurality of through holes 212 in a direction toward the rotation axis A so that the sliding pin 211 shorter than the thickness t of the cylindrical portion 210 is freely elevated. Become, The through-hole 212 is in contact with the outer circumferential surface (210b) of the cylindrical portion 210, the reverse rotation prevention device, characterized in that the closing member (213) for preventing the separation of the sliding pin (211) is coupled. 4. The method of claim 3, The cylindrical portion 210 is formed with a horizontal hole 214 according to the rotation axis (A) direction, A depth groove into which one end of the length member 214a is inserted into the support plate 320 to adjust the installation interval of the inner fixing body 300 by the length member 214a inserted into the horizontal hole 214. Reverse rotation prevention device, characterized in that 321 is formed. The method according to any one of claims 1 to 5, In the center of the inner fixing body 300, the reverse rotation prevention device, characterized in that the through-hole through which the drive shaft rotatably passes (301) is further formed.

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