CN114810858A

CN114810858A - Self-locking clutch

Info

Publication number: CN114810858A
Application number: CN202210425946.7A
Authority: CN
Inventors: 徐燕
Original assignee: Chengdu Feiqing Aviation Technology Co ltd
Current assignee: Chengdu Feiqing Aviation Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-07-29
Anticipated expiration: 2042-04-22
Also published as: CN114810858B

Abstract

The invention relates to a self-locking clutch, and belongs to the field of engines. The self-locking clutch comprises a driven plate and a power rotating shaft, wherein the power rotating shaft is rotatably arranged in the driven plate in a penetrating mode and is circumferentially provided with a plurality of flying blocks and wedge-shaped blocks, the flying blocks and the wedge-shaped blocks can radially move along the power rotating shaft, the flying blocks are matched with the driven plate and reset through a first spring, and the wedge-shaped blocks can be clamped by two adjacent flying blocks when being thrown out and can lock the flying blocks. The self-locking clutch provided by the invention has the advantages that no matter how the rotating speed of an engine fluctuates, the phenomenon of slipping between the flyweight and the driven disc is not easy to occur, the propeller can always normally rotate, meanwhile, the abrasion between the flyweight and the driven disc can be reduced, and the service life of the self-locking clutch is prolonged.

Description

Self-locking clutch

Technical Field

The invention belongs to the field of engines, and particularly relates to a self-locking clutch.

Background

On an unmanned aerial vehicle, a centrifugal clutch is generally required to be used for transmission between an engine and a propeller, a power rotating shaft of the centrifugal clutch is in transmission connection with the engine, a driven plate is in transmission connection with the propeller, and in the high-speed rotating process of the power rotating shaft, centrifugal force can enable a flying block to be thrown out and to be in friction contact with the inner surface of the driven plate, so that the power rotating shaft drives the driven plate to rotate, and when the power rotating shaft stops rotating or the rotating speed is lower than a preset threshold value, the flying block can be separated from the driven plate under the action of a spring.

At unmanned aerial vehicle flight stage, engine speed has certain fluctuation, and the rotational speed is undulant can cause the output torque unbalance and produce the clutch phenomenon of skidding, influences the normal work of screw, reduces the life of clutch.

Disclosure of Invention

In view of this, an object of the embodiments of the present invention is to provide a self-locking clutch, in which no matter how the rotation speed of the engine fluctuates, a slip phenomenon does not easily occur between the flyweight and the driven disk, the propeller can always rotate normally, and at the same time, the wear of the flyweight and the driven disk can be reduced, and the service life of the self-locking clutch can be prolonged.

The embodiment of the invention is realized by the following steps:

the embodiment of the invention provides a self-locking clutch which comprises a driven plate and a power rotating shaft, wherein the power rotating shaft is rotatably arranged in the driven plate in a penetrating mode, a plurality of flyweights and wedge-shaped blocks are distributed in the driven plate in a circumferential direction, the flyweights and the wedge-shaped blocks can move in the radial direction of the power rotating shaft, the flyweights are matched with the driven plate and reset through first springs, and the wedge-shaped blocks can be clamped by two adjacent flyweights and lock the flyweights when being thrown out.

As an alternative to the above embodiment, the distance between two adjacent flyweights is gradually reduced from inside to outside, and the width of the wedge-shaped block is gradually reduced from outside to inside.

As an alternative to the above embodiment, the flyweights are parallel to opposing faces of the wedge.

As an alternative to the above embodiment, the head of the wedge-shaped block is a cylindrical surface.

As an alternative of the above embodiment, the flyweight is provided with a mounting hole, the mounting hole is along the radial arrangement of the power rotating shaft and is in a stepped hole shape, a connecting bolt penetrates through the mounting hole, the connecting bolt penetrates through the mounting hole and is in threaded connection with the power rotating shaft, and the first spring sleeve is arranged on the connecting bolt and enables the flyweight to have a tendency of moving towards the center line of the power rotating shaft.

As an alternative of the above embodiment, a pressing plate and an adjusting cylinder are further disposed in the mounting hole, the pressing plate is sleeved on the connecting bolt and abutted to the first spring, the adjusting cylinder is sleeved on the head of the connecting bolt and in threaded engagement with the head of the connecting bolt, the adjusting cylinder is abutted to the pressing plate and used for adjusting the compression amount of the first spring, the connecting bolt is a countersunk head bolt, and the inner surface of one end of the adjusting cylinder is in a hexagon shape.

As an alternative to the above embodiment, the power rotating shaft and the driven disc are connected through at least two bearings, and an inner ring of at least one of the bearings is fixed through a shoulder of the power rotating shaft and a self-locking nut.

As an alternative of the above embodiment, a limit pin is disposed on the wedge block, the limit pin slidably penetrates through the power rotating shaft and is sleeved with a second spring, and the second spring makes the wedge block have a tendency of moving towards the center line of the power rotating shaft.

As an alternative to the above embodiment, the wedge-shaped block comprises a block, a locking member and a plurality of cylindrical contact rollers; the contact rollers are rotatably distributed on two sides of the block body and are used for rolling contact with the flyweights; the locking piece set up in on the block and with the contact roller is connected, the locking piece makes the contact roller can only unidirectional rotation, just during the locking piece unblock, the contact roller can counter rotation or bidirectional rotation.

As an alternative to the above embodiment, the locking member includes a locking frame, a third spring and a plurality of ratchet wheels, the locking frame is slidably disposed in the block and extends out from one end of the block, the third spring is used for limiting the movement of the locking frame, the locking frame is provided with a plurality of pawls, the ratchet wheels, the pawls and the contact rollers correspond to one another, the ratchet wheels are fixed at one end of the contact rollers, and the pawls are rotatably disposed on the locking frame and pressed against the ratchet wheels through a fourth spring; the contact roller rotates in one direction through the locking piece and can be unlocked when the locking frame moves.

The invention has the beneficial effects that:

according to the self-locking clutch provided by the invention, the engine can drive the power rotating shaft to rotate, when the power rotating shaft rotates, the flyweights can be thrown outwards by centrifugal force, the higher the rotating speed of the power rotating shaft is, the larger the centrifugal force is, the flyweights can be in frictional contact with the driven disc after being thrown out, so that the driven disc is driven to rotate, at the moment, the wedge-shaped blocks are clamped by the two adjacent flyweights, the positions of the flyweights are locked and cannot be reset, so that the flyweights and the driven disc are firmly locked, even if the rotating speed of the power rotating shaft is lower than a preset rotating speed threshold value, the propeller can still be driven to rotate, a slip phenomenon cannot occur between the flyweights and the driven disc, the propeller can always normally rotate, meanwhile, the abrasion between the flyweights and the driven disc can be reduced when the rotating speed of the engine fluctuates, and the service life of the self-locking clutch is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

Fig. 1 is a first schematic structural diagram of a self-locking clutch according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of a self-locking clutch according to a first embodiment of the present invention;

fig. 3 is a third schematic structural diagram of the self-locking clutch according to the first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a self-locking clutch provided by the first embodiment of the invention (unpowered rotating shaft);

FIG. 5 is a cross-sectional view A-A of FIG. 2;

fig. 6 is a sectional view of a self-locking clutch according to a second embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a wedge block and a flyweight according to a second embodiment of the present invention;

fig. 8 is a cross-sectional view of a wedge block provided in accordance with a second embodiment of the present invention;

FIG. 9 is a first view illustrating a ratchet and pawl combination according to a second embodiment of the present invention;

FIG. 10 is a second exemplary illustration of the relationship between the ratchet and the pawl according to the second embodiment of the present invention.

Icon:

10-a self-locking clutch;

11-a driven disc; 12-a power shaft;

110-a bearing;

120-flyweight; 121-a first spring; 122-mounting holes; 123-connecting bolts; 124-pressing plate; 125-a conditioning cylinder;

130-a wedge block; 131-a spacing pin; 132-a second spring; 133-block; 134-a locking element; 135-contact roller; 136-a locking rack; 137-a third spring; 138-ratchet wheel; 139-pawl; 140-a fourth spring; 141-ratchet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

First embodiment

Referring to fig. 1 to 5, a first embodiment of the present invention provides a self-locking clutch 10, and the self-locking clutch 10 may be applied to the field of unmanned aerial vehicles, and of course, may also be applied to other fields.

The self-locking clutch 10 provided in the present embodiment is a centrifugal clutch, that is, the self-locking clutch 10 includes a driven plate 11 and a power rotating shaft 12.

The power rotating shaft 12 is rotatably disposed through the driven plate 11, and the structure of the power rotating shaft 12 and the driven plate 11 can refer to the prior art, which is not described herein again.

The power rotating shaft 12 is in transmission connection with an output shaft of an engine, and the engine can drive the power rotating shaft 12 to rotate at a high speed.

The driven plate 11 is used for being connected with the propeller, and the driven plate 11 can drive the propeller to rotate when rotating.

The interior of the driven disk 11 may be in a stepped hole shape, the inner surface of the driven disk 11 and the power rotating shaft 12 may be connected by a bearing 110, and the position, number, fixing manner, etc. of the bearing 110 may refer to the prior art. The inner ring of the bearing 110 is fixed by a shaft shoulder of the power rotating shaft 12 and a self-locking nut, and the outer ring of the bearing 110 is limited by the driven disc 11.

The plurality of flyweights 120 are disposed on the power spindle 12, the number of flyweights 120 is not limited, and may be, for example, two, three, four, and the like, in this embodiment, the number of flyweights 120 is three, and the three flyweights 120 are uniformly distributed along the circumferential direction of the power spindle 12.

The flyer 120 is movable in the radial direction of the power shaft 12, and the flyer 120 is thrown out when the power shaft 12 rotates at a high speed, so that the flyer 120 is in frictional contact with the inner surface of the driven disk 11.

The connection mode of the flyweight 120 and the power shaft 12 can be selected from, but is not limited to, the following schemes: more than one guide hole is formed in the power rotation, and a guide rod is arranged on the inner side of the flyweight 120 and can be slidably arranged in the guide hole.

The flyweight 120 is provided with a mounting hole 122, the mounting hole 122 is a stepped hole, and the mounting hole 122 extends along the radial direction of the power rotating shaft 12 and penetrates through the flyweight 120.

Wear to be equipped with connecting bolt 123 in mounting hole 122, connecting bolt 123 includes head, pole portion and screw thread portion, and the diameter of screw thread portion can be less than the diameter of pole portion, screw thread portion and 12 threaded connection of power pivot, in pole portion slidable wears to locate mounting hole 122, the head is located mounting hole 122, and the head can adopt countersunk head formula straight groove or cross groove or interior hexagonal groove etc. and the use of being convenient for instrument revolves soon.

The rod part is sleeved with a first spring 121, the first spring 121 may be a compression spring, two ends of the first spring 121 are respectively abutted to the head part and the flyweight 120, and the first spring 121 can apply an acting force to the flyweight 120 in the direction of the central line of the power rotating shaft 12, so that the flyweight 120 has a tendency of moving in the direction of the central line of the power rotating shaft 12, that is, when the flyweight 120 is not blocked or centrifugal force, the flyweight 120 can move in the direction of the central line of the power rotating shaft 12 until the flyweight 120 is abutted to the power rotating shaft 12 (of course, the two are not abutted to each other, and are not in contact with each other).

The above structure can be combined with the prior art, and is not described herein again.

In addition, a plurality of wedge blocks 130 are further disposed on the power shaft 12, the wedge blocks 130 are used for locking the flyweights 120, the number of the wedge blocks 130 may be set according to the number of the flyweights 120, and of course, the number of the wedge blocks 130 is not necessarily equal to the number of the flyweights 120, as long as all the wedge blocks 130 can lock all the flyweights 120.

In this embodiment, the number of the wedge blocks 130 is three, the three wedge blocks 130 are uniformly distributed along the circumferential direction of the power spindle 12, and each wedge block 130 is correspondingly disposed between two flyweights 120.

The wedge block 130 can move along the radial direction of the power rotating shaft 12, and the connection mode of the two can adopt, but is not limited to, the following scheme: the wedge block 130 is provided with a limit pin 131, the limit pin 131 and the wedge block 130 can be fixed by welding, integral molding or detachable connection, and the limit pin 131 slidably penetrates through the power rotating shaft 12.

When the power spindle 12 rotates at a high speed, the wedge block 130 may also be thrown out by centrifugal force, and when the wedge block 130 is thrown out, the two adjacent flyweights 120 may clamp the wedge block 130, thereby locking the flyweights 120.

In order to make the locking effect of the wedge block 130 better, in this embodiment, both sides of the wedge block 130 and both sides of the flyweights 120 may be inclined surfaces, and both sides of the wedge block 130 and the imaginary opposite surfaces of the two adjacent flyweights 120 are symmetrical with respect to the radial direction of the power spindle 12, and the head of the wedge block 130 may be a cylindrical surface.

The distance between two adjacent flyweights 120 is gradually reduced from inside to outside, the width of the wedge block 130 is gradually reduced from outside to inside, and the flyweights 120 are parallel to the opposite surfaces of the wedge block 130, so that no matter where the flyweights 120 and the wedge block 130 are thrown out, the side surface of the wedge block 130 can be in surface contact with the side surface of the flyweights 120, and the flyweights 120 can only advance (thrown out) and cannot retreat (retract).

According to the type difference of unmanned aerial vehicles or airplanes, partial unmanned aerial vehicles' propellers can not rotate in the takeoff phase, if the propellers rotate, the propellers can be caused to flap the ground, so that the propellers are damaged, and the takeoff phase needs auxiliary means, such as catapult takeoff and the like. During the auxiliary takeoff, the engine must rotate at an idle speed, because if the engine is started after the auxiliary takeoff, the engine may crash due to long starting time of the engine or failure of an engine outlet wire to start. In the sliding stage of the auxiliary takeoff, the rotating speed of the idling engine is increased, so that the propeller is driven to normally rotate.

The application method of the self-locking clutch 10 provided by the embodiment of the invention is as follows:

placing the unmanned aerial vehicle at an auxiliary takeoff position;

the engine of the unmanned aerial vehicle is started to rotate at an idle speed, at the moment, the rotating speeds of the engine and the power rotating shaft 12 are low, the centrifugal force of the flyweights 120 is small, the flyweights 120 cannot break through the constraint of the first spring 121, the flyweights 120 are not in contact with the driven disc 11, and the driven disc 11 and the propeller do not rotate;

the unmanned plane takes off and slides by using an auxiliary means;

increasing the accelerator, increasing the rotation speed of the engine, so that the power rotating shaft 12 rotates at a high speed, a large centrifugal force throws the flyweights 120 and the wedge-shaped blocks 130 outwards, the first spring 121 is compressed until the flyweights 120 are in frictional contact with the driven disc 11, and at this time, the wedge-shaped blocks 130 are in contact with the two flyweights 120 respectively, so as to lock the positions of the flyweights 120;

if the rotating speed of the engine fluctuates greatly or the rotating speed of the engine is not enough to enable the flyweight 120 to be in close contact with the driven disc 11, the first spring 121 enables the flyweight 120 to have a tendency of resetting, but the flyweight 120 is blocked by the wedge-shaped block 130 and cannot be reset, the flyweight 120 is in close contact with the driven disc 11 all the time, transmission is achieved, the situation of slipping or no power of a propeller cannot occur, the phenomenon of slipping between the flyweight 120 and the driven disc 11 cannot occur, the propeller can rotate normally all the time, meanwhile, the abrasion between the flyweight 120 and the driven disc 11 when the rotating speed of the engine fluctuates can be reduced, and the service life of the self-locking clutch 10 is prolonged;

when the unmanned aerial vehicle lands, the engine is closed, and the propeller stops rotating, so that the unmanned aerial vehicle enters a gliding stage until the unmanned aerial vehicle lands on the ground;

resetting the wedge block 130 in a manner that is not limited to knocking the wedge block 130;

the first spring 121 pushes the flyweight 120 to return.

The steps can be increased, decreased, modified, and the order adjusted according to the needs.

Second embodiment

Referring to fig. 6, a second embodiment of the present invention provides a self-locking clutch 10, the self-locking clutch 10 is improved on the basis of the first embodiment, and compared with the first embodiment, the improvement points are as follows:

a pressure plate 124 and an adjusting cylinder 125 are also disposed in the mounting hole 122.

The pressing plate 124 is sleeved on the connecting bolt 123 and abutted against the first spring 121, the adjusting cylinder 125 is sleeved on the head of the connecting bolt 123 and in threaded engagement with the head of the connecting bolt 123, the adjusting cylinder 125 is abutted against the pressing plate 124 and is used for adjusting the compression amount of the first spring 121, the connecting bolt 123 adopts a countersunk head bolt, and the inner surface of one end of the adjusting cylinder 125 is in a shape of an inner hexagon.

During actual manufacturing and installation, the pre-tension of the first spring 121 and thus the centrifugal force when the flyweight 120 is thrown out are affected by the error. If the pretension force of the first spring 121 is too small, the flyweight 120 is easily thrown out, so that the propeller rotates abnormally when the engine idles; if the pretension force of the first spring 121 is too large, the flyweight 120 is not easily thrown out, which affects the normal transmission of the self-locking clutch 10.

By screwing the adjusting cylinder 125 and adjusting the position of the pressure plate 124, the compression amount of the first spring 121 can be changed, namely, the pretensioning force of the first spring 121 is adjusted to be in the most appropriate range, so that the propeller cannot be started abnormally, and the transmission is convenient to realize quickly.

The second spring 132 is sleeved on the limit pin 131, the second spring 132 is a compression spring, and two ends of the second spring 132 are respectively abutted against the limit pin 131 and the power rotating shaft 12, so that the wedge block 130 has a tendency of moving towards the central line of the power rotating shaft 12.

In addition, the wedge block 130 can only be separated from the flyweight 120 by knocking or the like due to the contact between the wedge block 130 and the flyweight 120, the knocking can affect the service life and the precision of the wedge block 130 or the whole self-locking clutch 10, and if the second spring 132 is not arranged, a worker needs to manually maintain all the wedge blocks 130 at the innermost positions to unlock the flyweight 120, which is time-consuming and labor-consuming.

Therefore, the present embodiment provides the following: referring to fig. 8, the wedge block 130 includes a block 133, a contact roller 135, and a locking member 134.

The overall shape of the block 133 is not limited, and the block 133 may be a solid structure, a frame structure, or the like, and a plurality of mounting shafts are provided on the block 133, the mounting shafts extending in the axial direction of the power rotating shaft 12.

The number of the contact rollers 135 is not limited, and may be, for example, two, three, four, etc., and in the present embodiment, the number of the contact rollers 135 is four, and two contact rollers 135 are respectively disposed on both sides of the block 133.

The contact roller 135 is cylindrical, the contact roller 135 is rotatably sleeved on the mounting shaft, the contact roller 135 is exposed from both sides of the block 133, and the contact roller 135 can be in rolling contact with the flyweight 120.

The locking member 134 is disposed on the block 133 and connected to the contact roller 135, the locking member 134 enables the contact roller 135 to rotate only in one direction, that is, when the wedge-shaped block 130 is brushed out, the contact roller 135 can roll along the flyer 120 (of course, it is also possible that the contact roller 135 does not roll at this time), and when the locking member 134 is unlocked, the contact roller 135 can rotate in the opposite direction or in both directions.

When the power spindle 12 rotates at a high speed and throws out the flyweight 120 and the wedge block 130, the locking member 134 locks the contact roller 135, and the contact roller 135 makes line contact with the flyweight 120, at this time, the contact roller 135 cannot rotate in the reverse direction, and even if the rotation speed of the power spindle 12 is too low, the wedge block 130 can still firmly lock the flyweight 120.

When the locking members 134 are unlocked, the contact roller 135 can rotate reversely or bidirectionally, at this time, the flyweights 120 have a tendency of moving inward under the action of the first spring 121, the wedge blocks 130 are pressed by the component force of the wedge blocks 130, the wedge blocks 130 can be pushed to reset (at this time, the contact roller 135 can rotate), the wedge blocks 130 do not need to be knocked, the positions of all the wedge blocks 130 do not need to be manually controlled, and only all the locking members 134 need to be unlocked.

In this embodiment, the locking member 134 can adopt, but is not limited to, the following scheme: referring to fig. 9 and 10, the locking member 134 includes a locking frame 136, a third spring 137 and a plurality of ratchets 138.

The locking bracket 136 is slidably disposed in the block 133 and extends from one end of the block 133, and the third spring 137 is used for limiting the movement of the locking bracket 136.

The locking frame 136 is provided with a plurality of pawls 139, and the ratchet wheels 138, the pawls 139 and the contact rollers 135 correspond one to one.

The ratchet 138 is fixed at one end of the contact roller 135, the ratchet 138 may be a disk, a plurality of ratchet teeth 141 are provided on a side surface of the ratchet 138, and the plurality of ratchet teeth 141 are uniformly distributed in a ring shape.

The pawl 139 is rotatably disposed on the locking frame 136 and pressed against the ratchet 138 by a fourth spring 140.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a from locking-type clutch, its characterized in that, includes driven plate and power pivot, the power pivot is rotatable to be worn to locate just along circumference distribution has a plurality of flyweight and wedge in the driven plate, flyweight with the wedge can be followed the radial activity of power pivot, flyweight with the driven plate matches and resets through first spring, the wedge can be by adjacent two when being thrown away flyweight centre gripping just will flyweight locking.

2. The self-locking clutch according to claim 1, wherein the distance between two adjacent flyweights is gradually reduced from inside to outside, and the width of the wedge-shaped block is gradually reduced from outside to inside.

3. The self-locking clutch of claim 2, wherein the flyweights are parallel to opposing faces of the wedge-shaped weights.

4. The self-locking clutch of claim 3, wherein the head of the wedge is a cylindrical surface.

5. The self-locking clutch according to claim 1, wherein the flyweight is provided with a mounting hole, the mounting hole is radially arranged along the power rotating shaft and is in a stepped hole shape, a connecting bolt penetrates through the mounting hole, the connecting bolt penetrates through the mounting hole and is in threaded connection with the power rotating shaft, and the first spring is sleeved on the connecting bolt and enables the flyweight to have a tendency of moving towards the center line of the power rotating shaft.

6. The self-locking clutch according to claim 5, wherein a pressing plate and an adjusting cylinder are further disposed in the mounting hole, the pressing plate is sleeved on the connecting bolt and abuts against the first spring, the adjusting cylinder is sleeved on the head of the connecting bolt and is in threaded engagement with the head of the connecting bolt, the adjusting cylinder abuts against the pressing plate and is used for adjusting the compression amount of the first spring, the connecting bolt is a countersunk head bolt, and an inner surface of one end of the adjusting cylinder is in a hexagon shape.

7. The self-locking clutch according to claim 1, wherein the power shaft is connected to the driven plate through at least two bearings, and an inner ring of at least one of the bearings is fixed by a shoulder of the power shaft and a self-locking nut.

8. The self-locking clutch according to any one of claims 1 to 7, wherein a limit pin is disposed on the wedge-shaped block, the limit pin slidably penetrates through the power rotating shaft and is sleeved with a second spring, and the second spring makes the wedge-shaped block have a tendency to move towards the center line of the power rotating shaft.

9. The self-locking clutch according to claim 8, wherein the wedge block comprises a block body, a locking member and a plurality of cylindrical contact rollers; the contact rollers are rotatably distributed on two sides of the block body and are used for rolling contact with the flyweights; the locking piece set up in on the block and with the contact roller is connected, the locking piece makes the contact roller can only unidirectional rotation, just during the locking piece unblock, the contact roller can counter rotation or bidirectional rotation.

10. The self-locking clutch according to claim 9, wherein the locking member comprises a locking frame, a third spring and a plurality of ratchet wheels, the locking frame is slidably disposed in the block and extends out from one end of the block, the third spring is used for limiting the movement of the locking frame, the locking frame is provided with a plurality of pawls, the ratchet wheels, the pawls and the contact rollers are in one-to-one correspondence, the ratchet wheels are fixed at one ends of the contact rollers, and the pawls are rotatably disposed on the locking frame and pressed against the ratchet wheels through a fourth spring; the contact roller rotates in one direction through the locking piece and can be unlocked when the locking frame moves.