CN113864358A

CN113864358A - Anti-reverse coupling

Info

Publication number: CN113864358A
Application number: CN202010611261.2A
Authority: CN
Inventors: 胡凯; 乐吉娜
Original assignee: Shanghai Liancheng Group Co Ltd
Current assignee: Shanghai Liancheng Group Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31

Abstract

The invention relates to an anti-reverse coupling, which comprises a first half coupling and a second half coupling, wherein a transmission module is arranged on the matching surface of the first half coupling, the transmission module comprises a plurality of connecting pieces, each connecting piece is connected with the matching surface of the first half coupling through a connecting shaft, an elastic piece is arranged on each connecting piece, a circular mounting groove is arranged on the matching surface of the second half coupling, a plurality of limit cavities which are uniformly distributed are arranged on the side wall of the mounting groove, the limit cavities are inclined towards the same side direction around the circle of the mounting groove, and the transmission module is embedded into the mounting groove. Compared with the prior art, the invention realizes the torque transmission of unidirectional rotation, when one of the rotating shafts changes the rotating direction, the connecting piece on the transmission module rotates to be separated from the current limit cavity, the torque transmission is stopped continuously, the driven machine is ensured not to change the rotating direction, and the effect of safety protection is achieved; large torque transmission is realized and the requirement on installation space is small.

Description

Anti-reverse coupling

Technical Field

The invention relates to the field of couplings, in particular to an anti-reverse coupling.

Background

In a rotary machine such as a water pump or a fan, a motor, a diesel engine, or other power driving devices are generally used as power sources, a mechanism for driving the mechanical device to mechanically rotate is provided, and torque is transmitted by means of a coupling, a belt pulley, and the like. For some rotating machines, due to structural constraints, operation is permitted only to maintain unidirectional rotation, which would otherwise cause damage. A typical pulley or coupling is capable of supporting rotation in both forward and reverse directions. It is therefore necessary to design a mechanism to prevent reverse rotation. The anti-reverse rotation coupling is needed to be invented to realize the function of unidirectional rotation.

Chinese utility model publication No. CN205745002U discloses an anti-reverse coupling, which realizes unidirectional rotation. When the couplings are rotated in opposite directions, one of the coupling halves is required to slide axially, i.e., one of the coupling halves is moved axially along the shaft to disengage the two couplings from each other and thereby disengage the intermeshing devices so that torque is not transmitted. However, such a structure has the following problems: 1. the matching strength of the half coupling sliding axially and the rotating shaft is weak, and the half coupling sliding axially and the rotating shaft are not suitable for large torque transmission; 2. the half coupling needs to perform sliding displacement, so that the requirement on space is high, and the application range is small; 3. the spring is required to reset the moving half-coupling, the difficulty of the spring setting is high, an additional fixing structure is required, or the length of the rotating shaft is limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an anti-reverse coupling which is used for realizing the transmission of large torque and has small requirement on a space structure.

The purpose of the invention can be realized by the following technical scheme:

an anti-reverse coupling comprises a first half coupling and a second half coupling, wherein the first half coupling and the second half coupling are respectively connected with two sections of rotating shafts needing torque transmission through a central shaft hole in a matched manner, the first half coupling and the second half coupling are connected through respective matching surfaces, a transmission module is arranged on the matching surface of the first half coupling, the transmission module comprises a plurality of connecting pieces, each connecting piece is connected with the matching surface of the first half coupling through a connecting shaft, an elastic piece is arranged on each connecting piece, a circular mounting groove is arranged on the matching surface of the second half coupling, a plurality of limit cavities are uniformly distributed on the side wall of the mounting groove, the limit cavities are inclined towards the same side direction around the circle of the mounting groove, and the transmission module is embedded into the mounting groove;

when the first half coupling and the second half coupling transmit torque mutually, the connecting piece is embedded into the limiting cavity under the support of the elastic piece; when the first half coupling and the second half coupling rotate in opposite directions, the connecting piece slides along the inner wall of the limiting cavity, so that the connecting piece overcomes the supporting force of the elastic piece and rotates around the connecting shaft until the connecting piece is separated from the limiting cavity and enters the next adjacent limiting cavity to circulate.

Furthermore, the connecting pieces are annularly distributed along the axial direction of the first half coupling, and the number of the connecting pieces is equal to that of the limiting cavities.

Furthermore, the limiting cavity is a triangular cavity, and the vertex angle of the triangular cavity faces to the tangential direction of the circle of the mounting groove.

Furthermore, the bottom angle of one side of the triangular cavity is an obtuse angle.

Furthermore, the shape of the connecting piece is matched with that of the triangular cavity.

Further, the number of the limiting cavities is at least 4.

Furthermore, the elastic part is a torsion spring sleeved on the connecting shaft, one end of the torsion spring is connected with the connecting piece, and the other end of the torsion spring is connected with the matching surface of the first half-coupling.

Furthermore, the transmission module further comprises an installation block, protective grooves are distributed on the peripheral side wall of the installation block, and the connecting pieces are arranged in the protective grooves in a one-to-one correspondence mode.

Further, the elastic component be the spring, the protection groove in be equipped with spring mounting groove, the spring setting in spring mounting groove to spring mounting groove bottom is connected to one end, and the other end links to each other with the connecting piece.

Furthermore, the mounting block is circular, and the diameter of the mounting block is smaller than that of the circular mounting groove.

Compared with the prior art, the invention has the following beneficial effects:

1. the coupling realizes the torque transmission of unidirectional rotation, when one rotating shaft changes the rotating direction, the connecting piece on the transmission module rotates to separate from the current limiting cavity, the torque transmission is stopped continuously, the driven machine is ensured not to change the rotating direction, and the safety protection effect is realized; meanwhile, the invention has no structure of axial movement, the rotating shaft and the coupling can be fixedly installed, large torque transmission can be realized, and the requirement on installation space is low.

2. The one-to-one correspondence of the number of the connecting pieces and the number of the limiting cavities ensures the transmission of large torque and the stability during the transmission of the torque.

3. The limiting cavity is a triangular cavity, and the bottom angle of one side of the cavity is an obtuse angle so as to improve the stability of torque transmission.

4. The transmission module is also provided with a protection block, and a protection groove provided with a connecting piece is arranged on the protection block, so that the structure can protect the connecting piece; meanwhile, the protective groove also plays a limiting role on the connecting piece, is used for bearing the reaction force during torque transmission and improving the stability during torque transmission.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic cross-sectional structure of the present invention.

Fig. 3 is a schematic structural diagram of the first half coupling.

Fig. 4 is a schematic view of the second coupling part.

Fig. 5 is a schematic sectional view showing the reverse rotation.

Reference numerals:

1. the device comprises a first half coupling body, 11, a connecting piece, 12, an elastic piece, 13, an installation block, 13a, a protection groove, 14, a connecting shaft, 2, a second half coupling body, 21, an installation groove, 21a and a limiting cavity.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 to 4, the present embodiment provides an anti-reverse coupling, which includes a first half coupling 1 and a second half coupling 2, where the first half coupling 1 and the second half coupling 2 are respectively connected with two sections of rotating shafts that need to transmit torque through a central shaft hole in a matching manner. The rotating shaft and the half coupling can be connected by common keys. The first coupling half 1 and the second coupling half 2 are connected by their mating surfaces.

The mating surface of the first coupling half 1 is provided with a transmission module comprising a mounting block 13 and a plurality of connecting pieces 11. The mounting block 13 is a circular block, the protection grooves 13a are uniformly distributed on the peripheral side wall of the mounting block 13, and the connecting pieces 11 are correspondingly arranged in the protection grooves 13a one to one. Meanwhile, each of the connection members 11 in the protection groove 13a connects the mating surfaces of the first coupling half 1, that is, both side walls of the protection groove 13a, by the connection shaft 14. An elastic member 12 is further provided on the link member 11, and the link member 11 is rotated about the connecting shaft 14 by the elastic member 12 such that one end thereof protrudes out of the protection groove 13 a.

The mating surface of the second coupling part 2 is provided with a circular mounting groove 21, which mounting groove 21 is arranged coaxially with the mounting block 13 and has a diameter slightly larger than the mounting block 13. A plurality of limit cavities 21a are uniformly distributed on the side wall of the mounting groove 21 to form a saw-tooth shape. The number of the limit cavities 21a is generally more than 4, and in this embodiment, 12 limit cavities 21a are provided. Meanwhile, the number and distribution of the limiting cavities 21a correspond to the connecting pieces 11 one by one. In this embodiment, the limiting cavities 21a are triangular cavities, the vertex angles of the triangular cavities face the tangential direction of the circular shape of the mounting groove 21, and the vertex angles of all the limiting cavities 21a face the tangential direction of the same circular shape of the mounting groove 21. The connecting piece 11 is a quadrilateral block, and the vertex angle of one end of the connecting piece can be just embedded into the triangular cavity. The bottom angle of one side of the triangular cavity is an obtuse angle, so that the triangular cavity can be better meshed with the connecting piece 11.

The elastic member 12 in this embodiment is a spring. A spring mounting groove is formed at the bottom of each protection groove 13a, a spring is arranged in the spring mounting groove, one end of the spring is fixedly connected with the bottom of the spring mounting groove, and the other end of the spring is connected with the connecting piece 11. The link 11 is ejected out of the protection groove 13a under the supporting force of the spring. The structure enables the spring to be easily regulated and controlled, and the service life is longer. In other embodiments, the elastic element 12 may also be a torsion spring directly sleeved on the connecting shaft 14, one end of the torsion spring is connected to the connecting element 11, and the other end is connected to the mating surface of the first coupling half 1, so that the structure is simpler.

When the first coupling half 1 and the second coupling half 2 are connected with each other, the connecting piece 11 unfolded from the protective groove 13a is inserted into the limit cavity 21a of the mounting groove 21, and the coupling is butted.

The working principle of the embodiment is as follows:

as shown in fig. 2, in a normal state, under the supporting force of the spring, the connecting member 11 rotates clockwise with the connecting shaft 14 as a rotation fulcrum, so that the connecting member 11 is inserted into the limit cavity 21a to form a position limit. During operation, if the first half-coupling 1 rotates anticlockwise, the first half-coupling 1 transmits torque to the connecting piece 11 through the matching surface with the connecting piece 11, and the connecting piece 11 transmits the torque to the second half-coupling 2 through the matching surface with the second half-coupling 2, so that torque transmission is completed.

As shown in fig. 5, when the reverse rotation occurs, the first half coupling 1 rotates clockwise, and the tooth-shaped limit cavity 21a on the second half coupling 2 compresses the connecting piece 11 toward the axis along the upper inclined surface of the connecting piece 11, so that the second half coupling 2 cannot rotate along with the first half coupling 1, and the purpose of preventing the reverse rotation is achieved. Therefore, accidents caused by operation failure and even damage of a driven mechanism due to steering change of power sources such as a motor and the like are avoided.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. An anti-reverse coupling comprises a first half coupling (1) and a second half coupling (2), wherein the first half coupling (1) and the second half coupling (2) are respectively connected with two sections of rotating shafts which need to transmit torque through a central shaft hole in a matching manner, and the anti-reverse coupling is characterized in that the first half coupling (1) and the second half coupling (2) are connected through respective matching surfaces, a transmission module is arranged on the matching surface of the first half coupling (1) and comprises a plurality of connecting pieces (11), each connecting piece (11) is connected with the matching surface of the first half coupling (1) through a connecting shaft (14), an elastic piece (12) is arranged on each connecting piece (11), a circular mounting groove (21) is arranged on the matching surface of the second half coupling (2), and a plurality of limit cavities (21a) which are uniformly distributed are arranged on the side wall of the mounting groove (21), the limiting cavities (21a) are inclined to the same side direction around the circle of the mounting groove (21), and the transmission module is embedded into the mounting groove (21);

when the first half coupling (1) and the second half coupling (2) transmit torque mutually, the connecting piece (11) is embedded into the limit cavity (21a) under the support of the elastic piece (12); when the first half coupling (1) and the second half coupling (2) rotate in opposite directions, the connecting piece (11) slides along the inner wall of the limiting cavity (21a), so that the connecting piece (11) overcomes the supporting force of the elastic piece (12) and rotates around the connecting shaft (14) until the connecting piece is separated from the limiting cavity (21a) and enters the next adjacent limiting cavity (21a) for circulation.

2. An anti-reverse coupling according to claim 1, characterized in that the connecting pieces (11) are annularly distributed along the axial direction of the first half coupling (1), and the number of the connecting pieces (11) is equal to that of the limiting cavities (21 a).

3. An anti-reverse coupling according to claim 1, characterized in that the limiting cavity (21a) is a triangular cavity, and the vertex angle of the triangular cavity faces the tangential direction of the circle of the mounting groove (21).

4. An anti-reverse coupling according to claim 3, wherein a bottom angle of one side of the triangular cavity is an obtuse angle.

5. An anti-reverse coupling according to claim 3, characterized in that the shape of the connecting piece (11) matches the shape of the triangular cavity.

6. An anti-reverse coupling according to claim 1, characterized in that the number of said limit cavities (21a) is at least 4.

7. An anti-reverse coupling according to claim 1, characterized in that the elastic member (12) is a torsion spring sleeved on the connecting shaft (14), one end of the torsion spring is connected with the connecting member (11), and the other end is connected with the matching surface of the first coupling half (1).

8. An anti-reverse coupling according to claim 1, characterized in that the transmission module further comprises a mounting block (13), protective grooves (13a) are distributed on the peripheral side wall of the mounting block (13), and the connecting pieces (11) are correspondingly arranged in the protective grooves (13a) one by one.

9. An anti-reverse coupling according to claim 8, characterized in that the elastic member (12) is a spring, the protection groove (13a) is provided with a spring mounting groove, the spring is arranged in the spring mounting groove, one end of the spring is connected with the bottom of the spring mounting groove, and the other end of the spring is connected with the connecting member (11).

10. An anti-reverse coupling according to claim 8, characterized in that the mounting block (13) is circular, the diameter of the mounting block (13) being smaller than the diameter of the circular mounting groove (21).