Self-locking coupling

Abstract

The utility model discloses a kind of self-locking couplings, including first coupling part, second coupling part and locking assembly, the first coupling part with the second coupling part is connected through the coaxial transmission of cotter, the middle shaft part of first coupling part is equipped with hollow input shaft section, the coaxial sleeve of the outer periphery of hollow input shaft section is equipped with static sleeve, the end face of first coupling part away from second coupling part is equipped with locking groove;The locking assembly is housed in locking groove, including locking block and the pre-tightening spring group for providing the elastic force of radial inward to the locking block, the locking block is hinged connection with the groove bottom of locking groove by hinged connecting arm, the end face of locking block opposite to static sleeve is equipped with the friction plate covered in the outer periphery of static sleeve.The utility model takes the hinge point of hinged connecting arm as fulcrum, the radial inward component force of inclined pull spring drives locking block to hold static sleeve tightly, cooperate the increased friction design of friction plate, realize the quick, reliable, durable self-locking function of coupling under non-driving state.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission equipment technology, specifically to a self-locking coupling. Background Technology

[0002] Traditional couplings, lacking an effective anti-rotation mechanism, are prone to unexpected rotation of the output shaft due to inertia or load gravity when the drive source is powered off or malfunctions. Existing solutions typically employ external brakes, but these have the following drawbacks: redundant structure, large space occupation, and increased cost; high power consumption and complex structure, increasing maintenance difficulty; and the brake requires signal triggering, resulting in corresponding delays and lag.

[0003] Therefore, there is an urgent need for a coupling structure that is integrated inside the coupling and can be actively triggered to mechanically lock. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a self-locking coupling.

[0005] The technical solution of this utility model is as follows: it includes a first coupling part, a second coupling part, and a locking assembly. The first coupling part and the second coupling part are coaxially connected by a pin. The central shaft part of the first coupling part is provided with a hollow input shaft section. A stationary sleeve is coaxially fitted on the outer periphery of the hollow input shaft section. The stationary sleeve is connected to an external bracket. The end face of the first coupling part away from the second coupling part is provided with a locking groove recessed towards the second coupling part. The locking assembly is housed in the locking groove and includes a locking block and a preload spring assembly for providing radially inward elastic force to the locking block. The locking block is hinged to the bottom of the locking groove through a hinged connecting arm. The end face of the locking block opposite to the stationary sleeve is provided with a friction plate covering the outer periphery of the stationary sleeve.

[0006] A further technical solution is as follows: the pre-tightening spring assembly includes a tension spring, the bottom of the locking groove is provided with a spring fixing post, and the spring fixing post is located on the radial inner side of the hinged connecting arm; one end of the tension spring is fixedly connected to the spring fixing post, and the other end is inclined radially outward and connected to the locking block.

[0007] A further technical solution is as follows: the locking block has a spring connecting cavity on its end face facing the hinged connecting arm, and the spring connecting cavity has a preload adjustment mechanism for a tension spring; the preload adjustment mechanism includes:

[0008] A spring adjusting groove is axially extended within the spring connecting cavity, and the groove body is radially inclined outward.

[0009] A spring sliding pin passes through a spring adjusting groove along the axial direction and has an adjusting hole in the radial direction.

[0010] The adjusting bolt has its end threaded through the threaded hole on the outer circumference of the locking block and then threadedly connected to the adjusting hole; the other end of the tension spring is connected to the spring sliding pin.

[0011] A further technical solution is as follows: the hinged connecting arm is hinged to the bottom of the locking groove via a hinged connecting pin, and the axis of the hinged connecting pin is parallel to the axis of the coupling; a hinged spacer is sleeved on the hinged connecting pin, and the position of the locking block along the axial direction of the coupling is adjusted by adjusting the length of the hinged spacer.

[0012] A further technical solution is that the opposite end faces of the first coupling and the second coupling are provided with pin cavities corresponding to the pins, and the two ends of the pins are respectively embedded in the corresponding pin cavities of the first coupling and the second coupling.

[0013] A further technical solution is that a number of pin cavities are evenly distributed circumferentially along the opposite end faces of the first and second couplings, and the two ends of each pin are respectively embedded in the corresponding pin cavity.

[0014] A further technical solution is as follows: the hollow input shaft section extends axially to form a drive connection cavity, the drive connection cavity is connected to an external drive source to realize torque input, and the central shaft of the second coupling is provided with a hollow output shaft section, the hollow output shaft section extends axially to form a transmission connection cavity to realize torque output.

[0015] The further technical solution is that the stationary sleeve is a split structure, including two sets of semi-cylindrical sleeves, which are detachably connected along the axial splicing surface by fasteners.

[0016] The beneficial technical effects of this utility model are as follows: A lever structure is formed by the locking block and the hinged connecting arm, with the hinge point of the hinged connecting arm serving as the fulcrum. The radial inward component of the tension spring drives the locking block to grip the stationary sleeve. Combined with the friction-enhancing design of the friction plate, this achieves a fast, reliable, and durable self-locking function for the coupling in a non-drive state. The effective working length of the tension spring can be dynamically adjusted by turning the adjusting bolt in the preload adjustment mechanism to adapt to the locking force requirements under different working conditions, making it convenient and efficient. The overall structure achieves instantaneous self-locking of the coupling without the need for external energy, combining compactness, adjustability, and high reliability, making it particularly suitable for safety-sensitive transmission systems. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the installation position of the locking component of this utility model;

[0020] Figure 4 This is an exploded view of the overall structure of this utility model;

[0021] 1. First coupling section; 11. Hollow input shaft section; 2. Second coupling section; 21. Hollow output shaft section; 3. Locking assembly; 31. Locking structure; 311. Hinge connecting arm; 312. Locking block; 313. Hinge connecting pin; 314. Hinge spacer; 315. Friction plate; 32. Preload spring assembly; 321. Diagonal tension spring; 322. Spring fixing post; 323. Spring connecting cavity; 324. Spring adjusting groove; 325. Spring sliding pin; 326. Adjusting bolt; 4. Pin; 5. Stationary sleeve; 6. Bracket; 7. Pin cavity; 8. Locking groove. Detailed Implementation

[0022] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] like Figure 1 and Figure 2 As shown, the self-locking coupling of this utility model includes a first coupling part 1, a second coupling part 2, and a locking component 3. The first coupling part 1 and the second coupling part 2 are coaxially connected by a plurality of pins 4.

[0024] The central shaft portion of the first coupling 1 is integrally formed with a hollow input shaft section 11. The hollow input shaft section 11 extends axially to form a drive connection cavity, which is used to fix it to an external drive source (such as a motor shaft, equipment spindle, etc.) through key connection, flange connection, or interference fit to realize torque input. A stationary sleeve 5 is coaxially sleeved on the outer periphery of the hollow input shaft section 11. The stationary sleeve 5 is detachably connected to an external bracket 6 by bolts to form a static support for the coupling.

[0025] Furthermore, the stationary sleeve 5 adopts a split structure, including two sets of semi-cylindrical sleeves, which are detachably connected along the axial splicing surface by fasteners. This split structure design of the stationary sleeve 5 makes its assembly faster and more efficient, and also facilitates subsequent maintenance.

[0026] The first coupling part 1 and the second coupling part 2 have pin cavities 7 evenly arranged circumferentially on their opposite end faces, each corresponding to a pin. The two ends of each pin are respectively embedded in the corresponding pin cavities 7 of the first coupling part 1 and the second coupling part 2. The central shaft of the second coupling part 2 is integrally formed with a hollow output shaft section 21. The hollow output shaft section 21 extends axially to form a transmission connection cavity. The torque is transmitted to the second coupling part 2 through the first coupling part 1 and the pins, and then the torque is output through the transmission connection cavity.

[0027] The end face of the first coupling part 1 facing away from the second coupling part 2 is provided with a locking groove 8 that is recessed towards the second coupling part 2. The opening of the locking groove 8 faces the outside of the first coupling part 1 and forms an annular groove with the stationary sleeve 5.

[0028] The locking component 3 is housed within the locking groove 8, such as Figure 3 and 4 The coupling includes several locking structures 31 evenly distributed circumferentially and preload spring groups 32 corresponding to each locking structure 31. Each locking structure 31 has a knife-shaped profile along the axial direction and includes a hinged connecting arm 311 and a locking block 312. The hinged connecting arm 311 is located in the arc extension direction of the locking block 312, and their outer peripheral surfaces are connected by a transition arc surface. The hinged connecting arm 311 is hinged to the bottom of the locking groove 8 through a hinged connecting pin 313. The axis of the hinged connecting pin 313 is parallel to the axis of the coupling. A hinged spacer 314 is sleeved on the hinged connecting pin 313. By adjusting the length of the hinged spacer 314, the position of the locking block 312 along the axial direction of the coupling can be adjusted. The end face of the locking block 312 opposite to the stationary sleeve 5 has a mating arc surface structure, and a friction plate 315 covering the outer peripheral surface of the stationary sleeve 5 is provided on the arc surface structure.

[0029] In this embodiment, the pre-tension spring assembly 32 includes a tension spring 321, and a spring fixing post 322 is provided at the bottom of the locking groove 8. The spring fixing post 322 is located radially inside the pin. One end of the tension spring 321 is fixedly connected to the spring fixing post 322, and the other end is radially outward inclined and connected to the locking block 312. This structure uses the hinge point of the hinged connecting arm 311 as the fulcrum. The radial inward component of the tension spring 321 drives the locking block 312 to instantly grip the stationary sleeve 5. Combined with the high friction of the friction plate 315, reliable self-locking is achieved.

[0030] Specifically, the locking block 312 has a spring connecting cavity 323 on its end face facing the hinged connecting arm 311, and the spring connecting cavity 323 has a preload adjustment mechanism for the tension spring 321.

[0031] The preload adjustment mechanism includes a spring adjustment groove 324 extending axially through the locking block 312, a spring sliding pin 325 extending axially through the spring adjustment groove 324, and an adjustment bolt 326. The spring adjustment groove 324 is radially outwardly inclined and communicates with the spring connecting cavity 323. An adjustment hole is radially formed in the spring sliding pin 325. The outer circumferential surface of the locking block 312 has a threaded hole communicating with the spring connecting cavity 323. The end of the adjustment bolt 326 passes through the threaded hole and is threadedly connected to the adjustment hole. One end of the inclined tension spring 321 is connected to a spring fixing post 322, and the other end is connected to the spring sliding pin 325. By turning the adjustment bolt 326, the spring sliding pin 325 is driven to slide along the spring adjustment groove 324, thereby changing the preload of the inclined tension spring 321. The preload adjustment mechanism enables precise adjustment of the effective working length of the inclined tension spring 321, thereby dynamically adapting to the locking force requirements under different working conditions and avoiding the cumbersome process of replacement and maintenance.

[0032] In the driving state, the first coupling 1 rotates and drives the second coupling 2 to rotate. Under the action of centrifugal force, the locking structure 31 pivots radially outward around the pin. At this time, the friction plate 315 disengages from the outer peripheral surface of the stationary sleeve 5, and the inclined spring 321 is in a stretched state. When the driving torque disappears, if the second coupling 2 tends to rotate relative to the first coupling 1 due to the action of external force, the locking structure 31 moves radially inward around the pin under the reset action of the inclined spring 321. The friction plate 315 covers and presses tightly against the outer peripheral surface of the stationary sleeve 5. Through the frictional resistance between the friction plate 315 and the stationary sleeve 5, the locking block 312 and the first coupling 1 are mechanically locked, thereby preventing the unintended rotation of the second coupling 2.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A self-locking coupling, characterized by: It includes a first coupling (1), a second coupling (2), and a locking assembly (3). The first coupling (1) and the second coupling (2) are coaxially connected by a pin (4). The central shaft of the first coupling (1) is provided with a hollow input shaft section (11). A stationary sleeve (5) is coaxially fitted on the outer periphery of the hollow input shaft section (11). The stationary sleeve (5) is connected to an external bracket (6). The end face of the first coupling (1) facing away from the second coupling (2) has a section facing the second coupling. A locking groove (8) recessed in the direction of the shaft portion (2); the locking assembly (3) is housed in the locking groove (8) and includes a locking block (312) and a preload spring assembly (32) for providing radially inward elastic force to the locking block (312). The locking block (312) is hinged to the bottom of the locking groove (8) through a hinged connecting arm (311). The end face of the locking block (312) opposite to the stationary sleeve (5) is provided with a friction plate (315) covering the outer peripheral surface of the stationary sleeve (5).

2. The self-locking coupling according to claim 1, characterized in that: The pre-tension spring assembly (32) includes a tension spring (321), and a spring fixing post (322) is provided at the bottom of the locking groove (8). The spring fixing post (322) is located on the radial inner side of the hinged connecting arm (311). One end of the tension spring (321) is fixedly connected to the spring fixing post (322), and the other end is inclined radially outward and connected to the locking block (312).

3. The self-locking coupling according to claim 2, characterized in that: The locking block (312) has a spring connecting cavity (323) on its end face facing the hinged connecting arm (311), and the spring connecting cavity (323) is provided with a preload adjustment mechanism for the tension spring (321); the preload adjustment mechanism includes: A spring adjusting groove (324) is axially extended within the spring connecting cavity (323), and the groove body is radially inclined outward. A spring sliding pin (325) passes through a spring adjusting groove (324) axially and has an adjusting hole in its radial direction; The adjusting bolt (326) has its end threaded through the threaded hole on the outer circumference of the locking block (312) and then threadedly connected to the adjusting hole; the other end of the tension spring (321) is connected to the spring sliding pin (325).

4. A self-locking coupling according to claim 1, characterized in that: The hinged connecting arm (311) is hinged to the bottom of the locking groove (8) via a hinged connecting pin (313). The axis of the hinged connecting pin (313) is parallel to the axis of the coupling. A hinged spacer (314) is sleeved on the hinged connecting pin (313). The position of the locking block (312) along the axial direction of the coupling is adjusted by adjusting the length of the hinged spacer (314).

5. A self-locking coupling according to claim 1, characterized in that: The first coupling part (1) and the second coupling part (2) are provided with pin cavities (7) corresponding to the pins on their opposite end faces. The two ends of the pins are respectively embedded in the pin cavities (7) corresponding to the first coupling part (1) and the second coupling part (2).

6. A self-locking coupling according to claim 5, characterized in that: Several pin cavities (7) are evenly distributed circumferentially along the opposite end faces of the first coupling (1) and the second coupling (2), and the two ends of each pin are respectively embedded in the corresponding pin cavity (7).

7. A self-locking coupling according to claim 1, characterized in that: The hollow input shaft section (11) extends axially to form a drive connection cavity, which is connected to an external drive source to achieve torque input. The central shaft of the second coupling (2) is provided with a hollow output shaft section (21), which extends axially to form a transmission connection cavity to achieve torque output.

8. A self-locking coupling according to claim 1, characterized in that: The stationary sleeve (5) is a split structure, including two sets of semi-cylindrical sleeves. The two sets of semi-cylindrical sleeves are detachably connected along the axial splicing surface by fasteners.

Images