CN210565881U - A super moment of torsion protection device and shaft coupling for shaft coupling - Google Patents

Abstract

The utility model relates to a super moment of torsion protection device for shaft coupling, it can cut off the transmission of moment of torsion when experiencing big moment of torsion and assault to avoid the shaft coupling to take place to warp and split even. The overtorque protection device for the coupler comprises a driving shaft, a driven shaft, a clutch and an actuating mechanism, wherein the clutch can be connected with the driving shaft and the driven shaft in a torsion-proof manner, the clutch is a normally closed friction clutch, and the actuating mechanism opens the clutch when torque exceeding a preset threshold value is transmitted between the driving shaft and the driven shaft. The utility model discloses still relate to the shaft coupling that adopts above-mentioned super moment of torsion protection device.

Description

A super moment of torsion protection device and shaft coupling for shaft coupling

Technical Field

The utility model relates to a super moment of torsion protection device especially relates to a super moment of torsion protection device for shaft coupling. Furthermore, the utility model discloses still relate to the shaft coupling that adopts this kind of super moment of torsion protection device.

Background

High-power driving equipment, such as an electric motor, a gas turbine or a steam turbine, needs to transmit torque to working equipment through a coupling, and large torque impact is generated when a unit is started or operates in a complex variable working condition environment. The torque that can be transmitted by the coupling is not infinite, when the peak value of large torque impact exceeds the range that the coupling can bear, the coupling can be deformed and damaged, even twisted off, and once the damage occurs, the whole unit can be broken.

To clear such a failure, the unit can continue to operate only after a new coupler is replaced, and as one of the core components of the unit, the replacement of the coupler needs to be performed through complex procedures such as performance tests and the like to ensure that the unit can continue to operate normally.

Therefore, there is a need for a protective device that prevents damage to the coupling when subjected to high torque impacts.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a super moment of torsion protection device for shaft coupling, it can be when bearing big moment of torsion and assault the transmission of cutting off the moment of torsion to avoid the shaft coupling to take place to warp and split even. The overtorque protection device for the coupler comprises a driving shaft, a driven shaft, a clutch and an actuating mechanism, wherein the clutch can be connected with the driving shaft and the driven shaft in a torsion-proof manner, the clutch is a normally closed friction clutch, and the actuating mechanism opens the clutch when torque exceeding a preset threshold value is transmitted between the driving shaft and the driven shaft.

The foundation the utility model discloses a super moment of torsion protection device's on the other hand, a pot head of driving shaft is equipped with the initiative flange, the one end of driven shaft is equipped with driven flange, the coaxial cover of other parts of driving shaft is established the radial inside of driven shaft, the initiative flange with driven flange is located both ends respectively.

The foundation the utility model discloses an on the other hand of super moment of torsion protection device, the clutch is multi-disc friction clutch, contains the initiative side friction disc group and the driven side friction disc group that coaxial crisscross set up, the antitorque ground cover of initiative side friction disc group is established the radial outside of driving shaft, driven side friction disc group is antitorque to be twisted ground and is set up the radial inside of driven shaft.

According to the utility model discloses an on the other hand of super moment of torsion protection device, actuating mechanism includes: the adjustable action block is provided with a cylindrical body, one end of the cylindrical body, which faces away from the clutch, is provided with a circle of flange, the edge of the flange is provided with a bulge extending axially towards the direction of the limit block, the limit block is cylindrical, the diameter of the limit block is smaller than that of the flange, the outer circumference of the limit block is provided with support parts which protrude radially outwards and correspond to the number of the bulge parts, the support parts are separated by unlocking notches, each unlocking notch can accommodate one bulge part, one end of the spiral spring is abutted against a friction plate group of the clutch, the other end of the spiral spring is abutted against the flange, the radial outer side of each support part is provided with a positioning part extending circumferentially, and the radial inner part of the driven shaft is provided with a positioning chute, the positioning part is matched with the positioning sliding groove to axially position the limiting block.

The foundation the utility model discloses a super moment of torsion protection device's on the other hand, be equipped with the inner clamping groove of axial extension on the driving shaft, be equipped with radial inward inner boss on the initiative side friction plate group, the inner boss embedding in the inner clamping groove, thereby initiative side friction plate group can not for the driving shaft is rotatory.

The foundation the utility model discloses a super moment of torsion protection device's on the other hand, be equipped with axial extension's outer draw-in groove on the inner wall of driven shaft, be equipped with radial outside outer boss on the driven side friction plate group, outer boss embedding in the outer draw-in groove, thereby driven side friction plate group can not for the driven shaft is rotatory.

The foundation the utility model discloses a super moment of torsion protection device's on the other hand, the driving shaft with still be equipped with ball bearing between the driven shaft, ball bearing's outer lane is fixed through the snap ring the radial inside of driven shaft, ball bearing's inner circle cover is established the radial outside of driving shaft.

Furthermore, the utility model also provides a shaft coupling that has above-mentioned super moment of torsion protection device.

Drawings

Fig. 1 is a longitudinal cross-sectional view of an over-torque protection device of a coupling according to an embodiment of the present invention;

fig. 2 is a schematic illustration of a locked position of an over-torque protection device of a coupling according to the present invention;

fig. 3 is a schematic view of an unlocked position of an over-torque protection device of a coupling according to the present invention;

fig. 4 is a schematic view of a clutch structure of an over-torque protection device of a coupling according to the present invention;

fig. 5 is a schematic structural diagram of a clutch friction plate set of an over-torque protection device of a coupler according to the present invention.

Description of the reference symbols

1 driving shaft

11 active flange

13 inner card slot

2 driven shaft

21 driven flange

22 positioning chute

23 external clamping groove

3 Clutch

31 active side friction plate group

311 inner boss

32 driven side friction plate group

321 outer boss

33 helical spring

34 adjustable action block

341 flange

342 tubular body

343 lug

35 limiting block

351 supporting part

352 location part

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Fig. 1 shows the internal structure of the over-torque protection device. The super-torque protection device comprises a driving shaft 1 and a driven shaft 2, and further comprises a clutch 3 which is connected with the driving shaft 1 and the driven shaft 2 in a torsion-resistant manner, wherein a ball bearing 4 is further arranged between the driving shaft 1 and the driven shaft 2, the inner ring of the ball bearing 4 is sleeved on the driving shaft 1, and the outer ring of the ball bearing is fixed on the inner wall of the driven shaft 2 through a clamping ring 41. One pot head of driving shaft 1 is equipped with initiative flange 11, the one end of driven shaft is equipped with driven flange 21, the coaxial cover of main part of driving shaft 1 is established the radial inside of driven shaft 2, initiative flange 11 with driven flange 21 is located the both ends of the two respectively. The clutch 3 is a multi-plate clutch, is arranged between the driving shaft 1 and the driven shaft 2, and is provided with a driving side friction plate set 31 and a driven side friction plate set 32 which are coaxially sleeved on the driving shaft 1. The driving side friction plate set 31 is arranged on the driving shaft 1, the driven side friction plate set 32 is arranged on the driven shaft 2, and the friction locking can be realized by pressing through a spiral spring 33 axially arranged on the driving shaft, so that power can be transmitted to the driven shaft 2 from the driving shaft 1 through friction force. One end of the spiral spring 33 abuts against the friction plate set, and the other end abuts against a flange 341 on the radial outer side of the adjustable action block 34, the adjustable action block 34 has a cylindrical body 342, which is sleeved on the driving shaft 1, and one end away from the clutch 3 has a flange 341 for applying pressure to the spiral spring 33. Two axially extending protrusions 343 are provided on the flange 341 in the opposite direction against the coil spring 33, and a stopper 35 is provided inside the driven shaft 2 facing the protrusions 343 and coaxially with the driving shaft 1. The stopper 35 also has a cylindrical body, two support portions 351 corresponding to the protruding portions 343 and protruding outward from the body in the radial direction, and a positioning portion 352 at the outermost side in the radial direction of the support portions 351. The inner wall of the driven shaft is provided with a positioning sliding groove 22 extending in the circumferential direction, and the positioning portion 352 is matched with the positioning sliding groove 22 to axially fix the limiting block 35 relative to the driven shaft 2.

As shown in fig. 2, in the locked state of the clutch of the present embodiment, the protrusion 343 of the adjustable actuating block 34 abuts against the support 351 of the stopper 35, the flange 341 axially compresses the coil spring 33, and the preload force generated by the coil spring 33 acts on the friction plate set of the clutch, thereby achieving the locking of the clutch, in which the torque can be transmitted from the driving shaft 1 to the driven shaft 2 through the clutch 3.

When a large torque impact is applied, that is, the torque to be transmitted exceeds the upper limit that can be transmitted by the friction plate set, sliding friction is generated between the driving side friction plate set 31 and the driven side friction plate set 32, relative rotation also starts to occur between the driving shaft 1 and the driven shaft 2, so that the adjustable action block 34 is also driven to rotate relative to the limit block 35, when the protruding portion 343 of the adjustable action block 34 rotates to the position shown in fig. 3, that is, from the support 351 to the notch position between the two supports, at this time, the protruding portion 343 is pushed into the notch by the action of the coil spring 33, the adjustable action block 34 is also pushed to the position far away from the friction plate set, and the pre-tightening force on the coil spring 33 disappears, so that the friction clutch 3 is also opened. At this time, the driving shaft 1 can rotate relative to the driven shaft 2, and large torque impact is also cut off and transmitted along with the rotation, so that the coupling is not influenced at all.

As shown in fig. 4, an axially extending external locking groove 23 is formed on the inner wall of the driven shaft 2, an external boss 321 is formed on the radial outside of the driven side friction plate set 32, and the external boss 321 can only slide axially in the external locking groove 23, so that the driven side friction plate set 32 and the driven shaft 2 keep rotating synchronously and can be operated by the coil spring 33 in the axial direction.

As shown in fig. 5, an axially extending inner locking groove 13 is provided on the radially outer circumference of the driveshaft 1, and the drive side friction plate group is provided with an inner projection 311 extending radially inward, and the inner projection 311 is axially movable only in the inner locking groove 13, so that the drive side friction plate group 31 is rotated in synchronization with the driveshaft 1, but is axially operated by the coil spring 33.

While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims. Furthermore, any reference signs in the claims shall not be construed as limiting the claim concerned. The word "comprising" does not exclude the presence of other devices or steps than those listed in a claim or the specification; the terms "first," "second," and the like are used merely to denote names, and do not denote any particular order. In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but also encompass tolerances as would be understood by one skilled in the art and permitted by fabrication or use.

Claims (8)

1. An over-torque protection device for a coupling, comprising:

a driving shaft (1) and a driven shaft (2),

a clutch (3) which can connect the drive shaft (1) and the driven shaft (2) in a torque-proof manner,

characterized in that the clutch (3) is a normally closed friction clutch, and further comprises an actuating mechanism which opens the clutch (3) when a torque exceeding a preset threshold value is transmitted between the driving shaft (1) and the driven shaft (2).

2. The over-torque protection device according to claim 1, wherein one end of the driving shaft (1) is sleeved with a driving flange (11), one end of the driven shaft (2) is provided with a driven flange (21), other parts of the driving shaft (1) are coaxially sleeved on the radial inner part of the driven shaft (2), and the driving flange (11) and the driven flange (21) are respectively arranged at two ends.

3. The overtorque protection device according to claim 2, wherein the clutch (3) is a multi-plate friction clutch and comprises a driving-side friction plate set (31) and a driven-side friction plate set (32) which are coaxially arranged in a staggered manner, the driving-side friction plate set (31) is sleeved on the radial outer portion of the driving shaft (1) in a torsion-proof manner, and the driven-side friction plate set (32) is arranged on the radial inner portion of the driven shaft (2) in a torsion-proof manner.

4. The over-torque protection device of claim 3, wherein the actuator comprises: the clutch comprises a spiral spring (33), an adjustable action block (34) and a limiting block (35) which are sequentially sleeved on the driving shaft (1), wherein the adjustable action block (34) is provided with a cylindrical body (342), one end of the cylindrical body (342) facing away from the clutch (3) is provided with a circle of flange (341), the edge of the flange (341) is provided with a protruding part (343) extending axially towards the direction of the limiting block (35), the limiting block (35) is cylindrical, the diameter of the limiting block is smaller than that of the flange (341), the outer circumference of the limiting block is provided with supporting parts (351) protruding outwards in the radial direction and corresponding to the number of the protruding parts (343), the supporting parts (351) are separated by unlocking notches, each unlocking notch can accommodate one protruding part (343), and one end of the spiral spring (33) abuts against a friction plate group of the clutch (3), the other end of the connecting rod abuts against the flange (341), a preset threshold value of torque transmission between the driving shaft (1) and the driven shaft (2) is determined by pretightening force of the spiral spring (33) on a friction plate set of the clutch (3), a positioning portion (352) extending in the circumferential direction is arranged on the radial outer side of each supporting portion (351), a positioning sliding groove (22) is arranged in the radial inner portion of the driven shaft (2), and the positioning portion (352) is matched with the positioning sliding groove (22) so as to axially position the limiting block (35).

5. The overtorque protection device according to claim 3, characterized in that the drive shaft (1) is provided with an axially extending inner bayonet slot (13), the drive-side friction disc pack (31) is provided with a radially inward inner lug (311), the inner lug (311) being embedded in the inner bayonet slot (13) such that the drive-side friction disc pack (31) cannot rotate relative to the drive shaft (1).

6. The overtorque protection device as claimed in claim 3, characterized in that an axially extending external catch groove (23) is provided on the inner wall of the driven shaft (2), and a radially outward external projection (321) is provided on the driven-side friction plate group (32), the external projection (321) being embedded in the external catch groove (23), so that the driven-side friction plate group (32) cannot rotate relative to the driven shaft (2).

7. The super-torque protection device according to any one of claims 1 to 6, wherein a ball bearing is further arranged between the driving shaft (1) and the driven shaft (2), an outer ring of the ball bearing is fixed on a radial inner part of the driven shaft (2) through a snap ring, and an inner ring of the ball bearing is sleeved on a radial outer part of the driving shaft (1).

8. A coupling characterised in that it includes an over-torque protection device as claimed in any one of claims 1 to 7.

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