High-precision safe torsion-limiting coupling

Abstract

The utility model relates to the technical field of couplings, in particular to a high-precision safety torsion-limiting coupling which comprises a safety coupling body, the safety coupling body is formed by combining a limiting assembly and a transmission assembly which are arranged on the outer surface of a coupling body in a sleeved mode, and the limiting assembly comprises a radial tooth type shaft inner sleeve. An overload action body is movably installed at the end, close to the transmission assembly, of the outer surface of the radial tooth type shaft inner sleeve, an adjusting nut is spirally installed on the side, away from the transmission assembly, of the overload action body, and a dirty tight sleeve is embedded in the end, close to the adjusting nut, of the interior of the radial tooth type shaft inner sleeve. A plurality of sets of annularly-distributed balls are installed at the position, close to the overload action body, of the periphery of the outer surface of the radial tooth type shaft inner sleeve in an embedded mode. The impact of moisture and dust factors in the external environment on the fatigue life of the bearing can be overcome, the bearing can be conveniently lubricated, the fatigue life is prolonged, the torque is kept, and high safety precision is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of couplings, in particular to a high-precision safety torque-limiting coupling. Background Art

[0002] The safety coupling is also called a torque limiter, torque limiter, or safety clutch. It is a component that connects the active machine and the working machine. Its main function is overload protection. When the required torque exceeds the set value due to overload or mechanical failure, the torque limiter limits the torque transmitted by the transmission system in the form of slipping. When the overload disappears, it automatically restores the connection, thus preventing mechanical damage and avoiding expensive downtime losses. However, the existing safety coupling structure does have certain defects and disadvantages, which lead to a decrease in accuracy after long-term use. The specific defects and disadvantages are as follows: The disc spring is in contact with the external environment for a long time. At this time, the moisture and dust factors in the external environment will directly affect its fatigue life. At the same time, the non-lubricated structure also directly shortens its fatigue life. The disc spring deforms after fatigue, thereby changing the set torque, which greatly reduces the safety accuracy.

[0003] Therefore, it is necessary to design a high-precision safety torque-limiting coupling to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide a high-precision safety torque-limiting coupling, which can overcome the influence of moisture and dust in the external environment on its fatigue life by isolating the disc spring from the external environment and setting up a lubrication treatment structure, and facilitate lubrication treatment, thereby extending the fatigue life, maintaining the torque, and achieving high safety precision, thereby solving the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-precision safety torque-limiting coupling comprises a safety coupling body, wherein the safety coupling body is composed of a limit assembly and a transmission assembly sleeved on the outer surface of the shaft, the limit assembly comprises a radial gear shaft inner sleeve, an outer surface of the radial gear shaft inner sleeve is movably installed with an overload action body near one end of the transmission assembly, an adjusting nut is spirally installed on the side of the overload action body away from the transmission assembly, a dirty tight sleeve is embedded and installed at one end of the radial gear shaft inner sleeve near the adjusting nut, a plurality of groups of annularly distributed balls are embedded and installed around the outer surface of the radial gear shaft inner sleeve near the overload action body, a disc spring is movably installed at one end of the overload action body near the adjusting nut, a spring groove is provided in the overload action body near the disc spring, a lubricating oil port is provided on the outer surface of the overload action body, the lubricating oil port and the spring groove are connected by an oil passage, and an elastic sealing ring is provided around the outer surface of the adjusting nut near the spring groove.

[0007] As a preferred solution of the utility model, a filter oil nozzle is embedded and installed inside the lubricating oil port.

[0008] As a preferred solution of the utility model, ball grooves are provided around the inner wall of the overload action body near a plurality of groups of balls distributed in an annular shape.

[0009] As a preferred solution of the utility model, the outer surface of the radial gear shaft inner sleeve is provided with a matching external thread near the adjusting nut, and the outer surface of the radial gear shaft inner sleeve is provided with a corresponding sliding groove near several groups of annularly distributed balls.

[0010] As a preferred solution of the utility model, the transmission assembly includes a flange, a bearing and a locking spring, the flange is located on the side of the overload action body away from the adjusting nut, the bearing is embedded in an end face of the flange away from the overload action body, and the locking spring is located on an end face of the bearing away from the flange.

[0011] As a preferred solution of the utility model, a toothed surface is provided on one end face of the flange close to the overload action body, and locking grooves corresponding to a plurality of groups of balls distributed in an annular shape are provided on the toothed surface.

[0012] As a preferred solution of the utility model, the elastic sealing ring is made of custom metal, and the elastic sealing ring and the adjusting nut are integrally processed and formed. At the same time, a ring groove matching the elastic sealing ring is opened on one end surface of the overload action body close to the adjusting nut.

[0013] Beneficial effects: The disc springs in the existing safety couplings are in contact with the external environment for a long time. At this time, the moisture and dust factors in the external environment will directly affect the length of their fatigue life. At the same time, the lack of lubrication treatment structure also directly greatly shortens their fatigue life. The disc springs are deformed after fatigue, thereby changing the set torque, and thus greatly reducing the problem of safety precision. The utility model isolates the running disc springs from the external environment through an additional elastic sealing ring, which can overcome the influence of moisture and dust factors in the external environment on their fatigue life. At the same time, the disc springs in the spring groove can be lubricated through the additional lubricating oil ports and oil circuits, which can extend the fatigue life, maintain the torque, and achieve high safety precision, thereby solving the problems raised in the above-mentioned background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall three-dimensional external structure diagram of the utility model;

[0015] Figure 2 This is a three-dimensional external structural diagram of the limiter assembly in the utility model;

[0016] Figure 3 It is the overall plan internal structure diagram of the utility model;

[0017] Figure 4 This is a plan view of the internal structure of the limiter assembly in the utility model;

[0018] Figure 5 It is a partial enlarged structural diagram of A in the utility model;

[0019] In the figure: 1. Safety coupling body; 2. Limit assembly; 21. Radial gear shaft inner sleeve; 211. Adjustment external thread; 212. Slide groove; 22. Overload action body; 221. Spring groove; 222. Lubricating oil port; 2221. Filter nozzle; 223. Oil circuit; 224. Ball groove; 23. Adjustment nut; 231. Elastic sealing ring; 24. Dirty tight sleeve; 25. Ball; 26. Disc spring; 3. Transmission assembly; 31. Flange; 311. Tooth surface; 312. Lock groove; 32. Bearing; 33. Locking retaining ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0024] See also Figure 1-5 , the utility model provides a technical solution:

[0025] A high-precision safety torque-limiting coupling comprises a safety coupling body 1, wherein the safety coupling body 1 is composed of a limit assembly 2 and a transmission assembly 3 which are sleeved on the outer surface of the shaft.

[0026] Specifically, the limit assembly 2 includes a radial gear shaft inner sleeve 21, an overload action body 22 is movably installed on the outer surface of the radial gear shaft inner sleeve 21 near one end of the transmission assembly 3, an adjusting nut 23 is spirally installed on the side of the overload action body 22 away from the transmission assembly 3, a dirty tight sleeve 24 is embedded and installed on one end of the radial gear shaft inner sleeve 21 near the adjusting nut 23, a plurality of groups of annularly distributed balls 25 are embedded and installed on the outer surface of the radial gear shaft inner sleeve 21 near the overload action body 22, and the inside of the overload action body 22 near the adjusting nut 23 A disc spring 26 is movably installed at one end of the overload action body 22, a spring groove 221 is provided inside the overload action body 22 near the disc spring 26, a lubricating oil port 222 is provided on the outer surface of the overload action body 22, the lubricating oil port 222 and the spring groove 221 are connected through an oil passage 223, and an elastic sealing ring 231 is provided around the outer surface of the adjusting nut 23 near the spring groove 221; the elastic sealing ring 231 is made of custom metal, and the elastic sealing ring 231 and the adjusting nut 23 are integrally processed and formed, and at the same time, the overload action body 22 near the adjusting nut 23 end The surface of the disc spring 26 is provided with an annular groove adapted to the elastic sealing ring 231. When overloaded, under the action of the electric control system, the disc spring 26 is deformed, driving the overload action body 22 to slide toward the adjusting nut 23. At the same time, a number of groups of annularly distributed balls 25 are separated from the transmission component 3. At this time, the transmission component 3 continues to rotate, and the limit component 2 and the shaft body stop rotating, thereby reaching a safe state, preventing mechanical damage and avoiding expensive downtime losses. When the overload situation disappears, the overload action body 22 is reset under the reaction of the disc spring 26, and pushes if The balls 25 distributed in an annular shape in the dry group fit with the transmission component 3 and restore the connection by themselves. The elastic sealing ring 231 added as a whole isolates the disc spring 26 in operation from the external environment, which can overcome the influence of moisture and dust factors in the external environment on the fatigue life of the disc spring 26. At the same time, the disc spring 26 in the spring groove 221 can be lubricated by the additional lubricating oil port 222 and the oil circuit 223, which can extend the fatigue life, maintain the torque, and achieve high safety precision. At the same time, the dirty tight sleeve 24 is provided to facilitate the disassembly and assembly of the shaft body;

[0027] Preferably, a filter oil nozzle 2221 is embedded in the lubricating oil port 222, and the filter oil nozzle 2221 prevents impurities and dust in the oil from entering the oil path 223 and the spring groove 221, thereby avoiding blockage of the oil path and affecting the performance of the disc spring 26;

[0028] Preferably, ball grooves 224 are provided around the inner wall of the overload action body 22 near the plurality of groups of annularly distributed balls 25; the outer surface of the radial gear shaft inner sleeve 21 is provided with a matching external thread 211 near the adjusting nut 23, and the outer surface of the radial gear shaft inner sleeve 21 is provided with a corresponding slide groove 212 near the plurality of groups of annularly distributed balls 25, and the ball grooves 224 and the slide grooves 212 can be provided to limit the balls 25 to maintain stability and reliability, and the slipping torque can be adjusted by the provided adjusting nut 23 and the matching external thread 211;

[0029] Preferably, the transmission assembly 3 includes a flange 31, a bearing 32 and a locking spring 33. The flange 31 is located on a side of the overload action body 22 away from the adjusting nut 23. The bearing 32 is embedded and installed on an end face of the flange 31 away from the overload action body 22. The locking spring 33 is located on an end face of the bearing 32 away from the flange 31. A tooth surface 311 is provided on an end face of the flange 31 close to the overload action body 22. Locking grooves 312 corresponding to a plurality of groups of annularly distributed balls 25 are provided on the tooth surface 311. The tooth surface 311 and the locking grooves 312 corresponding to the plurality of groups of annularly distributed balls 25 are conveniently positioned to smoothly restore the connection.

[0030] To sum up, the utility model can overcome the influence of moisture and dust in the external environment on the fatigue life of the disc spring by isolating the disc spring from the external environment and setting up a lubrication treatment structure, and facilitate lubrication treatment thereof, thereby extending the fatigue life, maintaining the torque, and achieving high safety precision.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision safety torque-limiting coupling, comprising a safety coupling body (1), characterized in that: The safety coupling body (1) is composed of a limit assembly (2) and a transmission assembly (3) sleeved on the outer surface of the shaft, the limit assembly (2) comprising a radial gear shaft inner sleeve (21), an overload action body (22) being movably mounted on one end of the outer surface of the radial gear shaft inner sleeve (21) close to the transmission assembly (3), an adjusting nut (23) being spirally mounted on the side of the overload action body (22) away from the transmission assembly (3), a dirty tight sleeve (24) being embedded and mounted on one end of the inner portion of the radial gear shaft inner sleeve (21) close to the adjusting nut (23), and a radial gear shaft inner sleeve (21) having ... A plurality of groups of balls (25) distributed in an annular shape are embedded and installed at the load action body (22); a disc spring (26) is movably installed at one end of the overload action body (22) near the adjusting nut (23); a spring groove (221) is provided at the inside of the overload action body (22) near the disc spring (26); a lubricating oil port (222) is provided on the outer surface of the overload action body (22); the lubricating oil port (222) and the spring groove (221) are connected through an oil passage (223); and an elastic sealing ring (231) is provided around the outer surface of the adjusting nut (23) near the spring groove (221).

2. A high-precision safety torque-limiting coupling according to claim 1, characterized in that: An oil filter nozzle (2221) is embedded and installed inside the lubricating oil port (222).

3. A high-precision safety torque-limiting coupling according to claim 1, characterized in that: Ball grooves (224) are provided around the inner wall of the overload action body (22) near a plurality of groups of balls (25) distributed in an annular shape.

4. The high-precision safety torque-limiting coupling according to claim 1, characterized in that: The outer surface of the radial gear shaft inner sleeve (21) is provided with a matching external thread (211) near the adjusting nut (23), and the outer surface of the radial gear shaft inner sleeve (21) is provided with a corresponding sliding groove (212) near a plurality of groups of annularly distributed balls (25).

5. The high-precision safety torque-limiting coupling according to claim 1, characterized in that: The transmission assembly (3) comprises a flange (31), a bearing (32) and a locking spring (33); the flange (31) is located on a side of the overload action body (22) away from the adjusting nut (23); the bearing (32) is embedded and mounted on an end surface of the flange (31) away from the overload action body (22); and the locking spring (33) is located on an end surface of the bearing (32) away from the flange (31).

6. A high-precision safety torque-limiting coupling according to claim 5, characterized in that: A toothed surface (311) is provided on one end surface of the flange (31) close to the overload action body (22), and locking grooves (312) corresponding to a plurality of groups of balls (25) distributed in an annular shape are provided on the toothed surface (311).

7. The high-precision safety torque-limiting coupling according to claim 1, characterized in that: The elastic sealing ring (231) is made of custom-made metal, and the elastic sealing ring (231) and the adjusting nut (23) are integrally formed, and a ring groove matching the elastic sealing ring (231) is provided on one end surface of the overload action body (22) close to the adjusting nut (23).

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