Controllable steel ball type torque limiter

Abstract

The utility model provides a controllable steel ball type torque limiter which comprises a connecting disc, a driving shaft, a retaining disc and a pressing disc, a pit is formed in the driving shaft, a bearing position is arranged at one end of the driving shaft, a bearing is installed on the bearing position, and a receding groove is formed in the other end of the driving shaft. A connecting disc is installed on the outer ring of the bearing and fixedly connected with a retaining disc, a set of large holes are formed in the center of the retaining disc, steel balls are arranged in the large holes, one end of each steel ball makes contact with a pit in the driving shaft, and the other end of each steel ball makes contact with one end of a pressing disc. And a positioning sleeve, a pressure spring, a round nut and a small steel ball are sequentially arranged at the other end of the pressing disc. The controllable steel ball type torque limiter solves the problems that an existing steel ball type torque limiter is large in noise and prone to damage due to vibration during overload protection.

Description

Technical Field

[0001] This utility model relates to a mechanical transmission device, and more particularly to a controllable steel ball torque limiter. Background Technology

[0002] A ball bearing torque limiter, also known as a safety clutch, safety coupling, or torque coupling, is a component that connects a driving machine and a driven machine. It is commonly installed between the driving and driven sides of a power transmission system. The ball bearing torque limiter contains a precision ball bearing mechanism. Under normal operating conditions, these balls are embedded in specific recesses to ensure torque transmission between the driving and driven ends. When the torque transmitted by the equipment exceeds the set slippage torque (i.e., overload), the balls leave the recesses, causing slippage between the driving and driven components. This reduces the transmitted torque and triggers the protection mechanism. In existing ball bearing torque limiters, when overloaded, the balls leave the recesses, causing slippage between the driving and driven components. At this point, the transmitted torque is reduced to a very small value, preventing equipment damage caused by overload. However, with frequent overload slippage, the balls will continuously detach from and reset in the recesses, resulting in loud noise and easy wear and failure of the balls. Utility Model Content

[0003] The purpose of this invention is to provide a controllable ball bearing torque limiter. By adding a locking structure, it solves the problems of high noise and easy damage from vibration during overload protection of existing ball bearing torque limiters.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A controllable ball-type torque limiter includes a connecting plate, a drive shaft, a retaining plate, and a clamping plate. The drive shaft has a recess, a bearing seat at one end, and a bearing mounted thereon. A clearance groove is provided at the other end of the drive shaft. A connecting plate is mounted on the outer ring of the bearing, and the connecting plate is fixedly connected to the retaining plate. A set of large holes is provided at the center of the retaining plate, and a steel ball is placed inside each hole. One end of the steel ball contacts the recess on the drive shaft, and the other end contacts one end of the clamping plate. A positioning sleeve, a compression spring, a round nut, and a small steel ball are sequentially arranged at the other end of the clamping plate. The positioning sleeve is looped around the outer circumference of the drive shaft. The compression spring is pressed into the compression spring hole of the positioning sleeve by the round nut. The small steel ball is installed in a small hole on the positioning sleeve.

[0006] A further improvement is that the recess on the drive shaft is an inverted conical recess that is larger on the outside and smaller on the inside, with the angle of the conical angle between 85 and 130 degrees.

[0007] A further improvement is that the center of the retaining disc is provided with a set of large holes, the number of which is the same as the number of pits provided on the drive shaft.

[0008] A further improvement is that the outer circumference of the retaining disk is provided with a set of threaded holes for connection with the connecting disk.

[0009] A further improvement is that one end of the positioning sleeve is provided with a set of circumferentially arranged small holes for holding and fixing the small steel ball, and the other end is provided with a set of compression spring holes for installing the compression spring.

[0010] A further improvement is that the end face of the round nut is provided with several countersunk holes for installing the compression spring, and its outer circle is provided with 2-4 internal threaded holes, in which copper pins and flat-end set screws are arranged.

[0011] A further improvement is that the inner chamfer of the conical surface of the inner hole of the clamping plate is 70-120 degrees.

[0012] The beneficial effects of this invention are as follows: When the ball bearing torque limiter is subjected to a torque greater than its set value, the connecting disc drags the retaining disc to rotate, pushing the steel ball out of the drive shaft recess and pushing the clamping disc to the right. The clamping disc forces the small steel ball to move to the right and fall into the clearance groove of the drive shaft, and continues to move until all the small steel ball is compressed into the inner hole of the clamping disc. At this time, the small steel ball and the positioning sleeve are in a locked state, and the connecting disc, retaining disc, and user connecting parts are completely free-spinning without any noise or vibration. When the clamping disc moves to the right, it can trigger the user's proximity switch to give a signal, cut off the system power, and trigger the protection mechanism, solving the problems of high noise and easy damage from vibration during overload protection of existing ball bearing torque limiters. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the structure of this utility model (the upper part is in the torque transmission state; the lower part is in the locking state).

[0014] Figure 2 This utility model Figure 1 A cross-sectional view of the drive shaft structure;

[0015] Figure 3 This is a right view of the retaining disc of this utility model;

[0016] Figure 4 This is a cross-sectional view of the pressing disc of this utility model;

[0017] Figure 5 This is a cross-sectional view of the positioning sleeve of this utility model;

[0018] Figure 6 This is a cross-sectional view of the round nut of this utility model;

[0019] Reference numerals: Connecting disc-1, Drive shaft-2, Retaining disc-3, Clamping disc-4, Positioning sleeve-5, Round nut-6, Recess-7, Bearing seat-8, Clear groove-9, Large hole-10, Threaded hole-11, Small hole-12, Copper pin-13, Compression spring hole-14, Countersunk hole-15, Internal threaded hole-16, Internal conical surface-17, Shaft elastic retaining ring-C1, Bearing-C2, Hole elastic retaining ring-C3, Socket head cap screw-C4, Steel ball-C5, Compression spring-C6, Small steel ball-C7, Flat end set screw-C8. Detailed Implementation

[0020] like Figures 1 to 6 As shown, this utility model discloses a controllable steel ball torque limiter, comprising a connecting disc 1, a drive shaft 2, a retaining disc 3, and a clamping disc 4. The drive shaft 2 has a recess 7, a bearing seat 8 at one end, and a bearing C2 mounted on the bearing seat 8. The other end of the drive shaft 2 has a clearance groove 9. The connecting disc 1 is mounted on the outer ring of the bearing C2, and the connecting disc 1 is fixedly connected to the retaining disc 3. The retaining disc 3 has a set of large holes 10 at its center, and a steel ball C5 is placed inside the large holes 10. One end of the steel ball C5 contacts the recess on the drive shaft 2, and the other end contacts one end of the clamping disc 4. The other end of the clamping disc 4 is sequentially provided with a positioning sleeve 5, a compression spring C6, a round nut 6, and a small steel ball C7. The positioning sleeve 5 is looped around the outer circumference of the drive shaft 2. The compression spring C6 is pressed into the compression spring hole 14 of the positioning sleeve 5 by the round nut 6. The small steel ball C7 is installed in the small hole 12 on the positioning sleeve 5.

[0021] The recess on the drive shaft 2 is an inverted conical recess that is larger on the outside and smaller on the inside, with the angle of the conical angle between 85 and 130 degrees.

[0022] The center of the retaining disc 3 is provided with a set of large holes 10. The number of large holes 10 is the same as the number of pits 7 provided on the drive shaft 2, usually 6-20.

[0023] The outer circumference of the retaining disk 3 is also provided with a set of threaded holes 11 for connecting with the connecting disk 1.

[0024] The positioning sleeve 5 has a set of circumferentially arranged small holes 12 at one end for holding and fixing the small steel ball C7, and a set of compression spring holes 14 at the other end for installing the compression spring C6. The end face of the round nut 6 also has several countersunk holes 15 for installing the compression spring C6, and its outer circumference has 2-4 internally threaded holes 16, in which copper pins 13 and flat-end set screws C8 are arranged. The inner side of the conical surface 17 of the inner hole of the clamping plate has a chamfer of 70-120 degrees.

[0025] In one specific embodiment, when this utility model is used, the drive shaft 2 has a flange structure with a set of recesses on the right side of the flange. A set of steel balls C5 are placed in the recesses, and a retaining plate 3 with a large hole is provided at the corresponding position to limit the steel balls C5. The retaining plate 3 is positioned and contacted with the connecting plate 1 through a stop and is fastened with an internal hexagonal head screw C4. The connecting plate and the outer circle on the left side of the drive shaft are kept concentric by a bearing C2 and limited by a shaft elastic retaining ring C1 and a hole elastic retaining ring C3. The clamping plate 4 contacts the steel ball C5 through the axial thrust provided by the small steel ball C7. When the torque limiter is subjected to a torque greater than its set value, the connecting plate 1 drags the retaining plate 3 to rotate, pushing the steel ball C5 out of the recess of the drive shaft 2 and pushing the clamping plate 4 to the right. At the same time, it gives a signal and forces the small steel ball C7 to move to the right and fall into the clearance groove of the drive shaft, and continues to move until the small steel ball C7 is completely retracted into the inner hole of the clamping plate. At this time, the small steel ball C7 and the positioning sleeve 5 are in the locked state, and the compression spring C6 between the positioning sleeve 5 and the round nut 6 is in the maximum pressure state. At this time, the connecting plate, the retaining plate and the user's connecting parts (the holes arranged on the connecting plate 1 are for the user's connecting parts) are completely free-running without any noise or vibration. When resetting, the clamping plate is moved to the left by external force, and the torque limiter returns to the set value. This solves the problem of high noise and easy damage from vibration when the existing steel ball torque limiter is overloaded.

Claims

1. A controllable ball bearing torque limiter, comprising a connecting disc (1), a drive shaft (2), a retaining disc (3), and a clamping disc (4), characterized in that, The drive shaft (2) is provided with a recess (7), and a bearing seat (8) is provided at one end of the drive shaft (2), on which a bearing (C2) is installed. The other end of the drive shaft (2) is provided with a clearance groove (9). A connecting plate (1) is installed on the outer ring of the bearing (C2), and the connecting plate (1) is fixedly connected to the retaining plate (3). A set of large holes (10) is provided in the center of the retaining plate (3), and a steel ball (C5) is provided in the large holes (10). One end of the ball (C5) contacts the recess on the drive shaft (2), and the other end of the ball (C5) contacts one end of the pressure plate (4). The other end of the pressure plate (4) is provided with a positioning sleeve (5), a compression spring (C6), a round nut (6), and a small steel ball (C7) in sequence. The positioning sleeve (5) is wrapped around the outer circle of the drive shaft (2). The compression spring (C6) is pressed into the compression spring hole (14) of the positioning sleeve (5) by the round nut (6). The small steel ball (C7) is installed in the small hole (12) provided on the positioning sleeve (5).

2. The controllable ball-type torque limiter according to claim 1, characterized in that, The recess on the drive shaft (2) is an inverted conical recess with a larger outer diameter and a smaller inner diameter, and the angle of the conical angle of the recess is between 85 and 130 degrees.

3. The controllable ball-type torque limiter according to claim 1, characterized in that, The center of the retaining plate (3) is provided with a set of large holes (10), the number of which is the same as the number of pits (7) provided on the drive shaft (2).

4. A controllable ball-type torque limiter according to claim 3, characterized in that, The outer circle of the retaining plate (3) is also provided with a set of threaded holes (11) for connecting with the connecting plate (1).

5. A controllable ball-type torque limiter according to claim 1, characterized in that, The positioning sleeve (5) has a set of circumferentially arranged small holes (12) at one end for holding and fixing the small steel ball (C7), and a set of compression spring holes (14) at the other end for installing the compression spring (C6).

6. A controllable ball-type torque limiter according to claim 1, characterized in that, The end face of the round nut (6) is also provided with several countersunk holes (15) for installing the compression spring (C6), and its outer circle is also provided with 2-4 internal threaded holes (16), in which copper pins (13) and flat-end set screws (C8) are arranged.

7. A controllable ball-type torque limiter according to claim 1, characterized in that, The inner chamfer of the inner conical surface (17) of the clamping plate (4) is 70-120 degrees.

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