KR101451318B1

KR101451318B1 - Spring Type Clutch

Info

Publication number: KR101451318B1
Application number: KR1020140104300A
Authority: KR
Inventors: 윤무영; 윤자영; 구본탁; 장주호
Original assignee: (주)중우엠텍; 윤무영
Priority date: 2014-08-12
Filing date: 2014-08-12
Publication date: 2014-10-15
Also published as: WO2016024733A1

Abstract

The present invention relates to a power transfer clutch transferring rotary force which includes a first clutch body (100) receiving the rotary force from a driving shaft to be rotated; and a second clutch body (200) transferring the rotary force received from the first clutch body (100) to a driven shaft, wherein the rotary force of the first clutch body (100) is transferred to the second clutch body (200) as the first clutch body (100) is rotated while a roller (130) disposed at the first clutch body (100) is in contact with a cam protrusion (242) of a cam (240) disposed at the second clutch body (200), and a slip phenomenon, in which the roller (130) pushes the cam protrusion (242) of the cam (240) outside and climbs over the cam protrusion (242) of the cam (240), occurs if a predetermined amount of load is applied to a driven shaft connected to the second clutch body (200) while the rotary force is transferred.

Description

{Spring Type Clutch}

The present invention relates to a power transmitting clutch in which a spring transmits a rotational force by using a cam and a roller acting on an elastic force and a slip is generated between the cam and the roller when an excessive external force is applied in excess of a threshold value in the power transmission process will be.

The power transmission clutch disclosed in the present invention is a device that can prevent power transmission due to a slip in the power transmission process when an external force (load) of a predetermined magnitude or more is operated in the course of transmitting rotational force.

As a prior art related to such an apparatus, there is a power transmission structure of an automatic revolving door using a ball and a one-way clutch, as shown in Fig. 1, and the structure thereof will be described as follows .

The prior art is mounted on the main surface of a rotating shaft 2 in which a plurality of inner doors 1 and 1 'are vertically installed in order to generate a slip during a power transmission process when an overload occurs, And a transparent wall body 5 is formed on an outer peripheral surface of the inner door 1 or 1 'so as to be rotatable by a drive motor 4 mounted inside the rotary shaft 2, A plurality of recesses 12 and 12 'are formed on an outer circumferential surface thereof and a separate rotary ring 19 slipping with the spline shaft 11 is inserted into the spline shaft 11, And a supporting base 14 to which a driven gear 13 engaged with the driving gear 6 of the driving motor 4 is mounted is coupled to the outer peripheral surface of the rotating ring 19, A plurality of transverse insertion holes 18 and 18 'are formed and a ball-shaped ball 16 elastically biased by a spring 15 is inserted into the insertion holes 18 and 18' And a part of the elastic portion 16 is exposed to the insertion holes 18 and 18 'so as to be seated in the grooves 12 and 12' of the rotary ring 19, Way clutch 20 is inserted into the flange 10 of the shaft 11 so that the rotary ring 19 is engaged with the outer circumferential surface of the one-way clutch 20.

This prior art has a problem that frictional heat is excessively generated due to continuous friction between the ball 16 and the rotary ring 19 during the slip, and the parts are easily worn.

In addition, by using a screw (bolt) type finish (17), there is a risk of separation due to bolt loosening when applied to a high speed rotating body.

In order to solve the above-mentioned problems, the object of the present invention is as follows.

First, it is an object of the present invention to provide a power transmission clutch with a new structure that can minimize friction and abrasion during a slip caused by an excessive load in a torque transmission process.

Another object of the present invention is to provide a power transmission clutch with a new structure that eliminates the risk of separating parts by bolt loosening even when rotating at a high speed by adopting a pin coupling method by eliminating the bolt coupling method.

Third, it is another object of the present invention to provide a power transmission clutch having a new structure using a cam and a roller which are elastically supported.

Fourthly, another object of the present invention is to provide a power transmission clutch of a new structure which is simple in structure, low in manufacturing cost, and high in durability and reliability.

Technical features of the present invention are as follows.

The present invention relates to a power transmitting clutch for transmitting rotational force.

The present invention is characterized by comprising: a first clutch body (100) rotating by receiving a rotational force from a drive shaft; And a second clutch body (200) for transmitting the rotational force transmitted from the first clutch body (100) to a driven shaft.

The first clutch body (100) includes a roller mounting portion (110) formed to extend from a front end of a column projecting forward of the first clutch body (100); A plurality of roller engaging pins 120 mounted in a direction parallel to the central axis of the first clutch body 100 to the roller mounting portion 110 at a position spaced apart from the central axis of the first clutch body 100; And a roller 130 rotatably coupled to the space between the roller mounting portion 110 and the first clutch body 100 through the center of each of the roller engagement pins 120. [

The second clutch body 200 includes an internal space 210 through which the rollers 130 of the first clutch body 100 are inserted and received through the open rear surface of the second clutch body 200; A cam receiving cutout 220 in which a side wall of the second clutch body 200 is cut so that the side surface of the inner space 210 is opened; A plurality of cam engaging pins 230 mounted on the cut surface of the cam receiving cutout 220 in a direction parallel to the center axis of the second clutch body 200; A cam protrusion 240 protruded toward the inside of the second clutch body 200 is rotatably coupled to the cam receiving cutout 220 through each of the cam coupling pins 230 and has a spring support portion 241 at one side thereof, A cam (240) provided with a cam (242); And the cam protrusion 242 of the cam 240 comes into contact with the spring support portion 241 of the cam 240 and is mounted inside the cam accommodating cutout portion 220 so that the cam protrusion 242 faces the inside of the second clutch body 200 And a spring 250 for supporting the spring 250.

The rotational force of the first clutch body 100 is transmitted to the second clutch body 200 in a state in which the roller 130 is in contact with the cam protrusion 242 of the cam 240 as the first clutch body 100 of the present invention rotates, When a load of a predetermined magnitude or more is applied to the driven shaft during the transmission of the rotational force, the roller 130 repeatedly slips over the cam protrusion 242 while pushing the cam protrusion 242 outward .

Technical effects of the configuration of the present invention are as follows.

First, friction and abrasion can be minimized during slip due to excessive load in the torque transmission process.

In other words, when a load larger than a predetermined size is applied to the driven shaft connected to the second clutch body 200 during the torque transmission process, the rotation of the second clutch body 200 is stopped. However, the first clutch body 100 is rotated from the drive shaft And the rotational force is continuously transmitted. As a result, the slipping phenomenon occurs when the roller 130 rides over the cam protrusion 242. This slipping phenomenon occurs repeatedly when the external force (load) is larger than the rotational force transmitted to the second clutch body 200, The roller 130 is rotatably coupled to the roller 130 so that the roller 130 rotates while being engaged with the cam protrusion 242 during the slipping process so that the roller 130 rides over the cam protrusion 242 so that excessive frictional heat is not generated and wear of the contact surface is minimized .

Second, by eliminating the bolt connection method and adopting the pin connection method, there is no risk of separating parts by bolt loosening even at high speed rotation.

In other words, the roller 130 and the cam 240 are respectively coupled by pins and a ring is provided to prevent the pin from coming off. Therefore, even if high-speed rotation, vibration, or impact is repeatedly generated, The combined state can be stably maintained.

Thirdly, the present invention provides a power transmission clutch having a new structure using the cam 240 and the roller 130, which are supported elastically, so that the structure is simple, the manufacturing cost can be reduced, and the durability and reliability of the product can be increased.

Fourth, when the power transmission clutch is applied to the torque transmission device, the power is automatically shut off due to slip when an excessive load is generated in the power transmission process, thereby being able to serve as a safety device for preventing damage to the power unit and the mechanism.

1 shows a conventional slip type power transmitting clutch.
2 is an exploded perspective view showing the structure of the power transmission clutch of the present invention.
Fig. 3 shows the outline of the state in which the power transmission clutch of the present invention is assembled.
4 is a cross-sectional view showing a process in which a slip occurs.
Figure 5 shows another specific embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmitting clutch for transmitting a rotational force, and comprises a first clutch body 100 serving as a driving body and a second clutch body 200 serving as a follower.

The first clutch body 100 transmits rotational force to the second clutch body 200 while receiving a rotational force from the drive shaft.

The second clutch body 200 serves to transmit the rotational force transmitted from the first clutch body 100 to the driven shaft.

The first clutch body 100 is provided with a roller mounting portion 110, a roller coupling pin 120, a roller 130, and the like.

2, the roller mounting portion 110 is formed to extend from the front end of a column projecting forward of the first clutch body 100, and the roller mounting portion 110 is formed at a front portion of the roller engaging pin 120 And serves to support the end portions.

A plurality of roller coupling pins 120 are mounted in a direction parallel to the center axis of the first clutch body 100 in a roller mounting portion 110 at a position spaced from the center axis of the first clutch body 100 by a predetermined distance.

In the concrete embodiment of the present invention, the four roller engagement pins 120 are arranged at intervals of 90 degrees, but it is not necessarily limited to this arrangement, and the intervals and the number of the arrangements can be changed.

The roller 130 is pivotally inserted into each of the roller engagement pins 120 and is rotatably coupled to the space between the roller mount 110 and the first clutch body 100.

A first support ring coupling protrusion 140 protruding forward is provided at the center of the front end of the roller mount 110. A first support ring 150 is mounted on the first support ring coupling protrusion 140, (120) to the front.

The first support ring 150 may be a simple circular ring-shaped member or a bearing member of a suitable size.

The second clutch body 200 is provided with an inner space 210, a cam receiving cutout 220, a cam coupling pin 230, a cam 240 and a spring 250 as shown in FIG.

The inner space 210 provides a space through which the roller 130 of the first clutch body 100 is inserted and accommodated through the open rear face of the second clutch body 200. That is, a space formed in the interior of the second clutch body 200.

The cam receiving cutout portion 220 is formed by cutting a side wall of the second clutch body 200 to open the side surface of the inner space 210. The cam receiving cutout portion 220 includes a cam 240 and a spring 250 are mounted.

2, the cam accommodating cutouts 220 may be provided on side walls of the second clutch body 200 at intervals of 180 degrees so as to face each other, or may be provided at three positions at intervals of 120 degrees. Or only one, or three or more.

A plurality of cam engagement pins 230 are mounted in parallel to the central axis of the second clutch body 200 so as to cross the cut surfaces of the cam receiving cutouts 220.

The cam 240 penetrates each of the cam engagement pins 230 and is rotatably coupled to the inside of the cam receiving cutout 220 as shown in FIG. 3, and a spring support portion 241 is provided at one side of the cam 240 And a cam protrusion 242 protruding toward the inside of the second clutch body 200 is provided on the other side of the cam 240.

2, two cams 240 are coupled to each of the cam receiving cutouts 220 such that the other side of the cam 240 is partially overlapped so that the cam protrusions 242 are arranged side by side at the same position Make space efficient. In addition, the number of the cams 240 is not limited to two, and the cam accommodating cutout 220 may include only one cam 240.

The spring 250 is mounted inside the cam receiving cutout 220 and abuts against the spring support portion 241 of the cam 240 and the cam protrusion 242 of the cam 240 contacts the inside of the second clutch body 200 So as to be pivoted.

A second support ring coupling protrusion 260 protruded forward is provided at the front end of the second clutch body 200. A second support ring 270 is mounted on the second support ring coupling protrusion 260, 2 or 3, it is preferable that a diameter of the second support ring 270 is larger than that of the second support ring 270 between the second clutch body 200 and the second support ring 270, The large auxiliary ring 280 may be inserted to cover the front end portion of the cam engagement pin 230. [

4 shows the operation principle of the power transmitting clutch. When the first clutch body 100 rotates by receiving the rotational force from the drive shaft as shown in FIG. 4 (a), the roller of the first clutch body 100 130 are brought into contact with and engaged with the cam protrusion 242 of the cam 240 provided in the second clutch body 200 so that the rotational force of the first clutch body 100 is transmitted to the second clutch body 200 do.

When a load greater than a predetermined magnitude acts on the driven shaft connected to the second clutch body 200 during the transmission of the torque, the rotation of the second clutch body 200 is stopped. However, the first clutch body 100 is continuously rotated from the drive shaft The rotational force is transmitted.

4 (b) to 4 (d), the roller 130 pushes the cam protrusion 242 outward so that the spring 250 is compressed and the cam 240 rotates and the roller 130 Is caused to slip over the cam protrusion 242. When the roller 130 rides on the cam protrusion 242 as shown in FIG. 4 (d), as the first clutch body 100 rotates, the next roller 130 again moves to the cam protrusion 242) are repeated.

The slip phenomenon occurs repeatedly when the external force (load) is greater than the rotational force transmitted to the second clutch body 200. The roller 130 is rotatably coupled to itself so that the cam protrusion 242 So that excessive friction heat is not generated and wear of the contact surface can be minimized.

As shown in FIGS. 2 to 4, the cam 240 and the spring 250 are disposed symmetrically on the cam accommodating cutout 220 of the second clutch body 200, When the first clutch body 100 is in the stopped state when the clutch body 100 rotates in the clockwise direction or in the counterclockwise direction and the external force (load) A slip phenomenon occurs in which only the body 100 rotates intermittently.

5 shows another embodiment of the present invention in which two springs 250 are disposed on each of the spring supporting portions 241 of the cam 240. As shown in Fig. That is, only one spring 250 may be used as needed, or two of the springs 250 may be used. If the number of the springs 250 is changed, the threshold value (threshold torque value) Flexibility is provided by changes in the environment. Also, when the spring 250 having a different elastic modulus is used, the same effect can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken as limiting of the scope of the present invention. It will be clear that the present invention falls under the scope of protection of the present invention even in the case of adding or deleting known technology or simply limiting the numerical value.

100: first clutch body
110: roller mounting portion
120: roller coupling pin
130: roller
140: first supporting ring engaging projection
150: first supporting ring
200: Second clutch body
210: inner space
220: cam receiving incision part
230: cam engaging pin
240: cam
241: spring support portion 242: cam projection
250: spring
260: second supporting ring engaging projection
270: second support ring
280: auxiliary ring

Claims

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmitting clutch for transmitting a rotational force,
A first clutch body (100) that rotates by receiving a rotational force from a drive shaft; And
A second clutch body (200) for transmitting a rotational force transmitted from the first clutch body (100) to a slave axis;
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In the first clutch body 100,
A roller mounting portion 110 extended from a front end of a column projecting forward of the first clutch body 100;
A plurality of roller engaging pins 120 mounted to the roller mounting portion 110 at a position spaced apart from the central axis of the first clutch body 100 in a direction parallel to the center axis of the first clutch body 100, ; And
A roller 130 pierced through each of the roller engagement pins 120 and rotatably coupled to a space between the roller mounting portion 110 and the first clutch body 100;
Respectively,
In the second clutch body 200,
An inner space 210 through which the rollers 130 of the first clutch body 100 are inserted and received through the open rear face of the second clutch body 200;
A cam receiving cutout 220 in which a side wall of the second clutch body 200 is cut so that a side surface of the internal space 210 is opened;
A plurality of cam engaging pins 230 mounted on the cut surface of the cam receiving cutout 220 in a direction parallel to the center axis of the second clutch body 200;
The cam coupling pin 230 is rotatably coupled to the cam receiving cutout 220 and has a spring support portion 241 at one side and a protrusion 241 at the other side protruding toward the inside of the second clutch body 200 A cam 240 provided with a cam protrusion 242; And
The cam protrusion 242 of the cam 240 is inserted into the cam accommodating cutout 220 so as to abut on the spring support portion 241 of the cam 240 so that the cam protrusion 242 of the cam 240 rotates toward the inside of the second clutch body 200 A spring (250) for resiliently supporting the spring (250);
Respectively,
The rotational force of the first clutch body 100 is transmitted to the second clutch body 100 in a state in which the roller 130 is in contact with the cam protrusion 242 of the cam 240 as the first clutch body 100 rotates, 200, and when a load larger than a predetermined size is applied to the driven shaft during the transmission of the rotational force, the roller 130 pushes the cam protrusion 242 of the cam 240 outward, Wherein the clutch is a spring.

The method of claim 1,
The cam receiving cutout portion 220 is formed in a substantially U-
And are provided on side walls of the second clutch body (200) at intervals of 180 degrees so as to face each other,
The cam (240)
And the other of the cams 240 is partially overlapped such that the cam protrusions 242 are arranged side by side at the same position. .

3. The method of claim 2,
Wherein the spring (250) is disposed on each of the spring supporting portions (241) of the cam (240).

4. The method according to any one of claims 1 to 3,
In the roller mounting portion 110,
A first support ring engaging protrusion 140 protruding forward from the center of the front end of the roller mount portion 110; And
A first support ring 150 mounted on the first support ring engagement protrusion 140 to prevent the roller engagement pin 120 from being disengaged forward;
Wherein the clutch is further provided with a spring.

5. The method of claim 4,
In the second clutch body 200,
A second support ring coupling protrusion 260 protruding forward from the center of the front end;
A second support ring 270 mounted on the second support ring coupling protrusion 260 to prevent the cam coupling pin 230 from being released forward; And
An auxiliary ring 280 inserted between the second clutch body 200 and the second support ring 270 and covering the front end of the cam engagement pin 230;
Wherein the clutch is further provided with a spring.

The method of claim 5,
Wherein the first support ring (150) or the second support ring (270) is a bearing.