CN201155534Y - an overrunning clutch - Google Patents

Abstract

The utility model discloses an overrunning clutch, which comprises an eccentric wheel installed coaxially, a disc-shaped driven sleeve and an intermediate ring fitted on the eccentric wheel, and a gap is formed between the intermediate ring and the driven sleeve. There is at least one wedge in the gap, and the wedge is installed on the eccentric through the bracket and the limit device, and has a certain moving stroke relative to the eccentric in the direction of rotation of the eccentric. The overrunning clutch has a large bearing capacity and is more suitable for high-power machines; moreover, the overrunning clutch has fewer components, a simple structure and is easier to process. In addition to being used in machine tools, it can also be used in engines or other machines that require overrunning clutches.

Description

an overrunning clutch

technical field

The utility model relates to a clutch, in particular to an overrunning clutch, which realizes combination and separation between a driven sleeve and an eccentric wheel by means of a wedge.

Background technique

Overrunning clutches or one-way clutches are widely used in various machine tools. It can be used to convert the reciprocating swing of the rocker of the pulse generating mechanism into an output mechanism of unidirectional pulsating rotary motion. Its working ability determines the efficiency of the whole machine, the size of the output torque and the length of the durable life.

In the currently applied pulsating continuously variable transmission, the roller type overrunning clutch has a sensitive response, the roller rotates freely in the raceway, wears evenly, and can still maintain a cylindrical shape after wear, and the short-term overload roller slip will not damage the clutch. It has been widely used for its features such as reduced torque and still able to work normally; however, its high contact stress and low load-carrying capacity make it unsuitable for high-power transmissions. Another CK series wedge type overrunning clutch on the market, its structure and performance are in the stage of perfection, its main principle still comes from the roller type overrunning clutch, which consists of outer ring, inner ring, roller, wedge, spring, retaining ring and other components, the inner ring needs to be processed into a number of concave circular groove shapes, and the wedge shape is mostly a special shape, such as fist shape, peach shape, shoe shape and other complex shapes, its bearing capacity and wear resistance are better than rolling Column type overrunning clutch, but its processing complexity is relatively high.

Utility model content

The purpose of the utility model is to provide an overrunning clutch, which has a simple structure and a larger carrying capacity.

The utility model adopts the following technical scheme: an overrunning clutch, including an eccentric wheel and a disc-shaped driven sleeve, the eccentric wheel is located in the concave cavity of the disc-shaped driven sleeve, and the eccentric wheel and the driven sleeve are coaxially installed , a gap with one side wide and one side narrow is formed between the outer edge of the eccentric wheel and the outer ring of the driven sleeve, and there is at least one arc-shaped wedge in the gap, and the size of the wedge in the gap width direction is larger than the smallest gap Width and less than the maximum width of the gap, the wedge is installed and positioned relative to the eccentric wheel through a limit device, and when the eccentric wheel rotates, there is a certain stroke in the limit device relative to the eccentric wheel; when the eccentric wheel rotates in the same direction as When the direction of the wedge is consistent from the small end to the large end, the wedge is at one end of its moving stroke and can be wedged between the eccentric wheel and the outer wall of the driven sleeve to clamp the eccentric wheel and the driven sleeve, and the wedge The outer edge of the opposing eccentric wheel and the two surfaces of the inner wall of the outer ring of the opposing driven sleeve form surface contact with the eccentric wheel and the driven sleeve respectively; When the wheel rotates, at least there is a gap between the wedge and the inner wall of the outer ring of the driven sleeve and the outer edge of the eccentric wheel.

Ideally, the utility model adopts the following technical solution: an overrunning clutch, which is characterized in that it includes an eccentric wheel and a disc-shaped driven sleeve coaxially installed, and a circular intermediate ring is set on the On the eccentric wheel and can rotate relative to the eccentric wheel, the intermediate ring and the eccentric wheel are located in the concave cavity of the disc-shaped driven sleeve, forming a side wide side between the outer edge of the intermediate ring and the outer ring of the driven sleeve. Narrow gap, there is at least one arc-shaped wedge in the gap, the size of the wedge in the width direction of the gap is greater than the minimum width of the gap and smaller than the maximum width of the gap, and the outer side of the eccentric wheel is connected to the direction of the driven sleeve For the extended bracket, the wedge is installed on the bracket and a limit device is used to limit the wedge to have a certain movement stroke in the rotation direction of the eccentric relative to the eccentric; when the rotation direction of the eccentric is the same as the small end to the wedge When the directions of the large ends are consistent, when the wedge is at one end of its moving stroke, it can wedge between the intermediate ring and the outer wall of the driven sleeve to clamp the intermediate ring, the eccentric wheel and the driven sleeve, and they are opposite to each other. The outer edge of the intermediate ring and the two surfaces of the inner wall of the outer ring of the opposing driven sleeve form surface contact with the intermediate ring and the driven sleeve respectively; When rotating, at least there is a gap between the wedge and the inner wall of the outer ring of the driven sleeve and the outer edge of the eccentric wheel.

In the overrunning clutch of the present utility model, by setting an arc-shaped wedge between the eccentric wheel and the driven sleeve, the displacement of the wedge relative to the eccentric wheel when the eccentric wheel rotates realizes the overrunning state of the working state of the clutch. The active wedge forms a surface contact with the corresponding driven sleeve and eccentric wheel or the intermediate ring, so that its load capacity is large enough. Compared with the existing overrunning clutch, it can transmit a larger torque and make its load capacity better Larger, more suitable for high-power machinery; and this overrunning clutch has fewer components, simple structure, and easier processing. In addition to being used in machine tools, it can also be used in engines or other machines that require overrunning clutches.

Description of drawings

Fig. 1 is a structural representation of the overrunning clutch of the present invention.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Fig. 3 is a schematic diagram of an overriding state.

Figure 4 is the end view of the wedge.

Fig. 5 is a schematic diagram of another embodiment of the overrunning clutch of the present invention.

In the figure: 1. Intermediate ring, 2. Disc, 3. Needle roller bearing, 4. Eccentric wheel, 5. Transmission pin, 6. Stop pin, 7. Needle roller bearing, 8. Driven sleeve, 8a, long hole , 9, sleeve, 10, output shaft, 11, key, 16, wedge, 16a, center hole, 17, spring, 18, connecting pin, 19, bump, 20, clearance.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, to help understand the content of the utility model.

Example 1

As shown in Figures 1 to 3, an overrunning clutch includes an eccentric wheel 4 coaxially installed on the output shaft 10 and a disc-shaped driven sleeve 8, and a circular intermediate ring 1 is sleeved on the eccentric wheel 4, and can rotate relative to the eccentric wheel 4, the intermediate ring 1 and the eccentric wheel 4 are located in the concave cavity of the disc-shaped driven sleeve 8, and there is a line between the outer edge of the intermediate ring 1 and the inner wall of the outer ring of the driven sleeve 8 A gap 20 with one side wide and one side narrow. An arc wedge 16 is installed in the gap 20. A disc 2 is integrally connected to the outside of the eccentric wheel 4. A wedge-shaped protrusion is installed on the disc 2 through a connecting pin 18. Block 19, the projection extends into the gap 20 and will keep a certain gap with the outer ring of the driven sleeve 8, and one end of a spring 17 is connected to the projection 19 and the other end is connected to the big end of the wedge 16. The cross-sectional shape of the wedge 16 is rectangular as shown in FIG. 4 , so as to maximize the contact area with the driven sleeve and the intermediate ring, and the central hole 16 a is used for installing the spring 17 . The effect of the disk 2 is equivalent to a support, so that the wedge 16 is fixedly installed relative to the eccentric wheel 4 through the limit device composed of the spring 17 and the protrusion 19, and can rotate with the eccentric wheel, and utilizes the stretching length of the spring 17 and The bump 19 then limits the position and movement range of the wedge 16 relative to the eccentric wheel.

Because the wedge 16 is a wedge-shaped structure with a large end and a small end, when the eccentric wheel 4 rotates clockwise according to the direction shown in Figure 2, its rotation direction is consistent with the direction from the small end to the large end of the wedge 16. , the intermediate ring 1 rotates together with the eccentric wheel 4, so that the gap 20 on the side where the wedge block 16 is located in the figure becomes narrower, while the gap on the other side becomes larger and larger. The wedge 16 located between the driven sleeve 8 and the intermediate ring 1 will overcome the action of the spring 17 due to inertia, and its movement lags behind the eccentric wheel 4 and the intermediate ring 1, so the wedge 16 moves in the opposite direction relative to the intermediate ring 1. And wedged between the driven sleeve 8 and the intermediate ring 1, the gap between the outer edge of the intermediate ring 1 where the wedge block 16 is located and the inner wall of the outer ring of the driven sleeve 8 is further changed to the minimum value, so that the driven sleeve 8, The intermediate ring 1 and the eccentric wheel 4 are quickly combined into a whole, and at the same time, the inner and outer sides of the wedge 16 form inter-surface contact with the outer edge of the intermediate ring 1 and the inner wall of the outer ring of the driven sleeve 8, because the intermediate ring 1 cannot continue to move relative to the driven sleeve. 8 moves, then the driven sleeve 8, the wedge 16, and the intermediate ring 1 rotate together with the eccentric wheel 4 to realize the transmission of torque between the eccentric wheel 4 and the driven sleeve 8. At this time, since the wedge 16 is in surface contact with the intermediate ring 1 and the driven sleeve 8, the force-receiving area is large, and greater torque can be transmitted.

As shown in Figure 2 and Figure 3, when the eccentric wheel 4 rotates counterclockwise, the intermediate ring 1 will also move counterclockwise, so that the gap 20 at the position of the wedge 16 changes from small to large, and the wedge 16 lags behind due to inertia. The intermediate ring 1 and the eccentric wheel 4 make the wedge move to the direction where the gap 20 is larger, and there is a gap between the wedge 16 and the driven sleeve 8 or the intermediate ring 1 on at least one side, so that the intermediate ring 1, the wedge 16 and The driven sleeve 8 separates rapidly. Simultaneously, under the action of the spring force, the wedge 16 moves toward the projection 19 direction, that is, the direction in which the gap 20 becomes larger. Since the projection 19 is fixed relative to the eccentric wheel 4 by the disk 2, the projection 19 limits the movement of the wedge 16 to the eccentric wheel 4. The position where the eccentric wheel 4 moves in the direction of rotation makes the eccentric wheel 4 rotate at any angle in the direction of rotation. The wedge block 16 is always kept at this position relative to the eccentric wheel 4 and rotates at the same angular velocity with the eccentric wheel 4. The wedge block 16 and the intermediate ring 1 There is always a gap between the outer edges of the outer ring or the inner wall of the outer ring of the driven sleeve 8, so that the intermediate ring 1 and the driven sleeve will not be wedged. This rotation process is the overrunning stroke.

Since the intermediate ring 1 is installed on the eccentric wheel 4 and the two rotate relatively, in order to reduce wear and tear, a needle bearing 7 is installed between the eccentric wheel 4 and the intermediate ring 1, and the needle bearing can withstand greater force.

It is also possible to set a radial long groove 8a on the driven sleeve 8 as shown in Figures 1 to 3, install a stop pin 6 on the intermediate ring 1 and insert it into the radial long groove 8a on the driven sleeve 8, and The width of the long groove 8a is slightly larger than the diameter of the stop pin 6. Using the guiding effect of the long groove 8a, the intermediate ring 1 is affected by the eccentric wheel 4 during the use of the bird coupler, and basically winds around the shaft in the inner cavity of the driven sleeve 8. The heart swings and revolves, and the angle at which it can rotate around the axis is limited by the width of the radial slot 8a. Since the rotation range of the intermediate ring is limited, the response is more sensitive, and in the working state, the torque is transmitted between the intermediate ring 1 and the driven sleeve 8 by the wedge 16 and the stop pin 6 at the same time, which further increases the bearing capacity. But in the overrunning state, since the intermediate ring 1 is movable, no torque will be transmitted between the intermediate ring 1 and the driven sleeve 8 .

The disc 2 is used to install and limit the wedge 16 so that it can rotate with the eccentric wheel 4, so the disc 2 acts as a mounting bracket for the wedge 16, so a rod can also be welded to the eccentric wheel instead of the disc Form a scaffold. However, the disc structure is adopted, and the balance is better, and the disc also acts as an end cover to cover the wedge 16 and the gap 20 .

Because the wedge 16 is installed on the eccentric wheel 4 so that it can rotate synchronously with the eccentric wheel in the normal state, the relative displacement occurs only at the moment of transition between the overrunning state and the working state due to inertia. The function of the projection 19 is to install the wedge 16 and realize the wedge Block 16 is limited when it is in an overridden state, so the bump 19 can be in any cross-sectional shape.

It can be understood that for the installation method of the wedge 16, a slide rail can also be used, for example, a slide groove is processed on the edge of the disc 2, and the wedge 16 is embedded in the slide groove. The length of the slide groove on the circumference of the eccentric wheel greater than the length of the wedge, so that the wedge 16 can move relative to the eccentric with a certain amount of displacement, forming a realization similar to that in which a chute 4b is processed on the eccentric 4 in FIG. 5 .

In this embodiment, the driven sleeve 8 is installed on the output shaft 10 through the key 11 , and the eccentric wheel 4 is installed on the shaft 10 through the needle bearing 3 . The output shaft 10 can also install the driven sleeve 10 and transmit torque through the spline structure. It can be understood that gears can also be installed on the driven sleeve 8 to output power without shaft output. If the eccentric wheel is installed on the shaft by key, spline or other means, then the shaft can be used as the power input device, and the driven sleeve 8 will be installed on the shaft by a bearing or be vacantly sleeved on the shaft. Also can make driven sleeve and eccentric wheel all be empty sleeve or be installed on the axle 10 by bearing, and drive gear is set on eccentric wheel for power output, and driven gear is installed on the driven sleeve. Or as shown in Figure 1, two discs are arranged on the eccentric wheel 4, and a transmission pin 5 is installed between the two discs. The effect of sleeve 9 is to prevent the driven sleeve from running outside.

There can also be more than one wedge 16, but this will complicate the structure.

Example 2

As shown in Figure 5, it is also possible to directly increase the diameter of the eccentric wheel 4 to the same position as the outer edge of the intermediate ring in Figures 1 to 3, and cancel the intermediate ring, and the eccentric wheel 4 is located in the disc-shaped driven sleeve 8 In the concave cavity, the eccentric wheel 4 and the driven sleeve 8 are coaxially installed, and a gap 20 with one side wide and one side narrow is formed between the outer edge of the eccentric wheel 4 and the outer ring of the driven sleeve 8, and there is An arc-shaped wedge 16 is provided with a limiting chute 4a on the edge of the eccentric, and the wedge 16 is installed in the chute and can have a certain stroke relative to the eccentric 4 in the direction of rotation of the eccentric. When the eccentric wheel rotates clockwise, its rotation direction is consistent with the direction from the small end to the large end of the wedge, and the wedge 16 moves to the left side of the chute 4a due to inertia, and can be wedged between the eccentric wheel 4 and the outer wall of the driven sleeve 8. The eccentric wheel 4 and the driven sleeve 8 are stuck, and the two surfaces of the outer edge of the opposing eccentric wheel 4 and the inner wall of the outer ring of the opposing driven sleeve 8 form surface contact with the eccentric wheel and the driven sleeve respectively, so that the driven sleeve 8 is combined with the eccentric wheel 4 and rotates synchronously together for torque transmission. When the eccentric wheel rotates counterclockwise, the wedge 16 moves toward the wider gap due to inertia, so that the eccentric wheel 4 and the driven sleeve 8 are quickly disengaged, and the wedge 16 slides to the right end of its moving stroke and rotates with the eccentric wheel 4. At least there is a gap between the wedge 16 and the inner wall of the outer ring of the driven sleeve 8 and the outer edge of the eccentric wheel 4, which is in the overrunning stroke. The method shown in Figures 1 to 3 can also be used, a disc is coaxially connected to the outside of the eccentric wheel 4, and the limit device consists of a protrusion extending from the disc to the gap between the eccentric wheel and the driven sleeve and One end of the spring is connected to the bump, and the other end is connected to the large end of the wedge 16, and there is a gap between the bump and the outer ring of the driven sleeve.

Compared with the method shown in Fig. 5, the method shown in Fig. 1 to Fig. 3 adds an intermediate ring 1. Since the intermediate ring 1 can rotate around the eccentric wheel 4, there is a buffering effect at the moment of wedge 16 wedging, so the eccentric wheel and the The combination and disengagement of the driven sleeve are more stable and the impact is small.

Claims (9)

1. An overrunning clutch, characterized in that it includes an eccentric wheel and a disc-shaped driven sleeve, the eccentric wheel is located in the concave cavity of the disc-shaped driven sleeve, and the eccentric wheel and the driven sleeve are coaxially installed. A gap with one side wide and one side narrow is formed between the outer edge of the eccentric wheel and the outer ring of the driven sleeve, and there is at least one arc-shaped wedge in the gap, and the size of the wedge in the gap width direction is greater than the minimum width of the gap and Smaller than the maximum width of the gap, the wedge is installed and positioned relative to the eccentric wheel through a limiting device, and when the eccentric wheel rotates, there is a certain stroke in the limiting device relative to the eccentric wheel; when the eccentric wheel rotates in the same direction as the wedge When the direction from the small end to the large end is consistent, the wedge is at one end of its moving stroke and can be wedged between the eccentric wheel and the outer wall of the driven sleeve to clamp the eccentric wheel and the driven sleeve, and the wedges face each other. The outer edge of the eccentric wheel and the two surfaces of the inner wall of the outer ring of the opposing driven sleeve form surface contact with the eccentric wheel and the driven sleeve respectively; when the eccentric wheel rotates in the opposite direction, the wedge is at the other end of its moving stroke and rotates with the eccentric wheel , at least there is a gap between the wedge and the inner wall of the outer ring of the driven sleeve and the outer edge of the eccentric wheel. 2. The overrunning clutch according to claim 1, characterized in that: said limiting device is a slide groove on the edge of the eccentric wheel. 3. The overrunning clutch according to claim 1, characterized in that: a disc is coaxially connected to the outer side of the eccentric wheel, and the limiting device extends from the disc to the space between the eccentric wheel and the driven sleeve. The protruding block and the spring extending in the gap between them are composed of one end of the spring connected to the protruding block and the other end connected to the large end of the wedge block, and there is a gap between the protruding block and the outer ring of the driven sleeve. gap. 4. An overrunning clutch, which is characterized in that it includes an eccentric wheel and a disc-shaped driven sleeve installed coaxially, and a circular intermediate ring is set on the eccentric wheel and can rotate relative to the eccentric wheel. The intermediate ring and the eccentric wheel are located in the cavity of the disc-shaped driven sleeve, and a gap with one side wide and one side narrow is formed between the outer edge of the intermediate ring and the outer ring of the driven sleeve, and there is at least one arc-shaped wedge, the size of the wedge in the width direction of the gap is greater than the minimum width of the gap and smaller than the maximum width of the gap, and a bracket extending toward the driven sleeve is connected to the outside of the eccentric wheel, and the wedge is installed On the support and through a limit device, the wedge block has a certain movement stroke relative to the eccentric wheel in the rotation direction of the eccentric wheel; when the rotation direction of the eccentric wheel is consistent with the direction from the small end to the large end of the wedge block, the wedge block When it is at one end of its moving stroke, it can be wedged between the intermediate ring and the outer wall of the driven sleeve to clamp the intermediate ring, the eccentric wheel and the driven sleeve, and it faces the outer edge of the intermediate ring and the outer wall of the driven sleeve. The two surfaces of the inner wall of the ring are respectively in surface contact with the intermediate ring and the driven sleeve; when the eccentric rotates in the opposite direction, and the wedge is at the other end of its moving stroke and rotates with the eccentric, at least the wedge and the driven sleeve There is a gap between the inner wall of the outer ring and one side of the outer edge of the eccentric wheel. 5. The overrunning clutch according to claim 4, characterized in that: a long radial groove is set on the driven sleeve, a stop pin is installed on the intermediate ring and inserted into the long radial groove on the driven sleeve, The radial slot width is slightly larger than the diameter of the stop pin. 6. The overrunning clutch according to claim 4 or 5, characterized in that: a needle bearing is installed between the intermediate ring and the eccentric wheel. 7. The overrunning clutch according to claim 4 or 5, characterized in that the support is a disc integrally connected to the outside of the eccentric wheel, the limiting device is composed of a bump and a spring, The bump is installed on the disc and extends into the gap, and a certain gap should be maintained with the outer ring of the driven sleeve. One end of the spring is connected to the bump and the other end is connected to the big end of the wedge . 8. The overrunning clutch according to claim 8, wherein said projection is mounted on said disc through a connecting pin. 9. The overrunning clutch according to claim 4 or 5, characterized in that the cross-sectional shape of the wedge is rectangular.

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