Transmission shaft with overload protection

Abstract

The utility model relates to the technical field of transmission shafts, in particular to a transmission shaft with overload protection, locking helical tooth rings are clamped on the outer surfaces of a first transmission shaft and a second transmission shaft, screwing rings are rotatably connected in the first transmission shaft and the second transmission shaft, and threaded rods are slidably connected in the first transmission shaft and the second transmission shaft. The outer surfaces of the two threaded rods are fixedly connected with slope blocks, and the two sets of balls are slidably connected to the interiors of the first transmission shaft and the second transmission shaft correspondingly, so that when the locking helical tooth ring needs to be replaced and maintained after being used for a long time, a screwing ring is screwed to rotate, and the locking helical tooth ring can be replaced and maintained. When the screwing ring rotates, the thread drives the threaded rod to slide towards the end away from the locking helical tooth ring, the threaded rod slides to drive the slope block to slide, at the moment, the balls lose extrusion force, when the locking helical tooth ring is pulled and taken out, the two balls are extruded to slide inwards and contract, and the locking helical tooth ring can be pulled and taken out by screwing the screwing ring for replacement and maintenance. Operation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shafts, in particular to a transmission shaft with overload protection. Background Art

[0002] The drive shaft is a mechanical component that is mainly used to transmit power and torque. It is usually made of metal materials with high strength and rigidity to withstand rotational motion and transmitted force. When the drive shaft is used in a car, due to improper driving by the driver, the drive shaft is overloaded, and the engine is still running and power is still being output, which can easily lead to damage to the drive shaft. It is necessary to add an overload protection function to it.

[0003] For example, a Chinese patent discloses: an automobile transmission shaft with an overload protection device, patent number: CN220185648U, which is matched by the first transmission shaft, the second transmission shaft, the oil ring, the disc spring, the return spring, the latch, the pad, and the meshing groove, so that the integrated transmission shaft is divided into two parts. When the torque generated by the second transmission shaft is too large and exceeds the set threshold and is about to be overloaded, the excessively high speed causes the latch and the pad to disengage from the meshing groove, thereby causing the disc spring and the return spring to contract, and the gear seat slides to the left on the first transmission shaft to separate the gear seat from the rotating seat, and the second transmission shaft idles and cannot transmit, so that when the driver drives improperly and the transmission shaft is about to be overloaded, the transmission shaft can be protected in time.

[0004] However, in the process of implementing the above technical solution, it was found that there are at least the following technical problems: the above device divides the transmission shaft into two parts, and the calipers of the two transmission shafts are engaged to achieve the overload protection effect. However, in the process of achieving overload protection, the caliper is constantly squeezed and pushed when sliding back under the action of the spring, and the degree of wear of the teeth will increase due to the squeezing. The caliper in the above device is fixedly installed on the transmission shaft. When the caliper is worn or damaged, the caliper cannot be replaced alone, and the transmission shaft needs to be disassembled as a whole for replacement, which increases maintenance costs and workload. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a transmission shaft with overload protection, which solves the technical problem that the above-mentioned device divides the transmission shaft into two parts, and the overload protection effect is achieved by the engagement of the calipers of the two transmission shafts. However, in the process of achieving overload protection, the caliper is continuously squeezed and pushed when sliding back under the action of the spring, and the degree of wear of the teeth is increased due to the squeezing. The caliper in the above-mentioned device is fixedly installed on the transmission shaft. When the caliper is worn or damaged, the caliper cannot be replaced alone, and the transmission shaft needs to be disassembled as a whole for replacement, which increases the maintenance cost and workload.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the utility model is realized through the following technical solutions:

[0009] A drive shaft with overload protection includes a first drive shaft and a second drive shaft. Locking bevel gear rings are clamped on the outer surfaces of the first drive shaft and the second drive shaft. The two locking bevel gear rings are adapted to each other. Screwing rings are rotatably connected inside the first drive shaft and the second drive shaft. Threaded rods are slidably connected inside the first drive shaft and the second drive shaft. The two threaded rods are respectively threadedly connected inside the two screwing rings. Inclined blocks are fixedly connected to the outer surfaces of the two threaded rods. Arc grooves are formed inside the two locking bevel gear rings. Clamping mechanisms are slidably connected inside the first drive shaft and the second drive shaft. Each clamping mechanism includes two groups of ball beads, and the two groups of ball beads are respectively slidably connected inside the first drive shaft and the second drive shaft.

[0010] Preferably, a connecting ring is fixedly connected to the outer surface of the second drive shaft.

[0011] Preferably, a first return spring is sleeved on the outer surface of the first drive shaft.

[0012] Preferably, sleeves are fixedly connected to the upper ends of the two screwing rings, and inserting rods are rotatably connected inside the two sleeves.

[0013] Preferably, second return springs are sleeved on the outer surfaces of the two inserting rods.

[0014] Preferably, round rods are fixedly connected inside the two inserting rods, and a group of card slots are formed inside the first drive shaft and the second drive shaft.

[0015] (3) Beneficial effects

[0016] 1. When the locking bevel gear ring needs to be replaced and maintained after long-term use, rotate the screwing ring. When the screwing ring rotates, the thread drives the threaded rod to slide towards the end away from the locking bevel gear ring. The sliding of the threaded rod drives the inclined block to slide. At this time, the ball beads lose the extrusion force. When pulling out the locking bevel gear ring, squeeze the two ball beads to slide inwards and contract. By rotating the screwing ring, the locking bevel gear ring can be pulled out for replacement and maintenance. The operation is simple and convenient. The design of the ball beads being in contact with the inclined surface of the arc groove has the effect of automatically adjusting the position when installing the locking bevel gear ring, avoiding deviation during the installation of the locking bevel gear ring, improving the reliability of the installation, and ensuring the meshing of the two locking bevel gear rings.

[0017] Second, when there is no need to screw the screwing ring for installation and disassembly operations, the screwing ring is clamped in the card slot through the insertion rod to prevent accidental rotation of the screwing ring. When it is necessary to rotate the screwing ring, the insertion rod is screwed 90 degrees. At this time, the round rod can slide vertically out of the card slot. Pull the insertion rod out of the card slot, and when it is in the extended state, screw the insertion rod 90 degrees to reset. At this time, the screwing ring loses its limit and can be rotated to perform the clamping and loosening work, which is beneficial to improving the stability and reliability of the device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following describes the preferred embodiments of the present invention in detail in conjunction with the drawings.

[0019] Figure 1 is a three-dimensional structure diagram of the present invention;

[0020] Figure 2 is an exploded view of the connection of the connecting ring of the present invention;

[0021] Figure 3 is an exploded view of the connection of the threaded rod of the present invention;

[0022] Figure 4 is a truncated view of the connection of the insertion rod of the present invention.

[0023] Legend: 11, the first transmission shaft; 12, the second transmission shaft; 13, the locking bevel gear ring; 14, the screwing ring; 15, the threaded rod; 16, the inclined plane block; 17, the arc groove; 18, the ball bead; 19, the connecting ring; 21, the first return spring; 22, the sleeve; 23, the insertion rod; 24, the second return spring; 25, the round rod; 26, the card slot. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] By providing a drive shaft with overload protection in the embodiments of the present application, the above-mentioned device effectively solves the problem that the drive shaft is divided into two parts, and the calipers of the two drive shafts mesh to achieve the overload protection effect. However, during the implementation of overload protection, the calipers are continuously squeezed and pushed when sliding back under the action of the spring, and the teeth of the calipers will increase in wear due to extrusion. The calipers in the above-mentioned device are fixedly installed on the drive shaft. When the calipers are worn or damaged, the calipers cannot be replaced individually, and the drive shaft needs to be disassembled as a whole for replacement, which increases the maintenance cost and workload. When the locking helical gear ring needs to be replaced and maintained after long-term use, rotate the screwing ring. When the screwing ring rotates, the thread drives the threaded rod to slide towards the end away from the locking helical gear ring, and the sliding of the threaded rod drives the inclined plane block to slide. At this time, the ball loses the extrusion force. When pulling out the locking helical gear ring, the two balls are squeezed to slide inwards and contract. By rotating the screwing ring, the locking helical gear ring can be pulled out for replacement and maintenance, and the operation is simple and convenient. The design of the ball being in contact with the inclined plane of the arc groove has the effect of automatically adjusting the position during the installation operation of the locking helical gear ring, avoiding deviation during the installation of the locking helical gear ring, improving the reliability of the installation, and ensuring the meshing of the two locking helical gear rings.

[0025] Embodiment

[0026] Such as Figure 1 、 Figure 2 、 Figure 3 And Figure 4As shown, the technical solution in the embodiment of the present application effectively solves the technical problem that in the above device, the transmission shaft is divided into two parts, and the calipers of the two transmission shafts are engaged to achieve the overload protection effect. However, during the implementation of overload protection, the calipers are continuously squeezed and pushed when resetting and sliding under the action of the spring, and the teeth of the calipers will increase in wear due to extrusion. The calipers in the above device are fixedly installed on the transmission shaft. When the calipers are worn or damaged, the calipers cannot be replaced separately, and the transmission shaft needs to be disassembled as a whole for replacement, increasing the maintenance cost and workload. The general idea is as follows: A transmission shaft with overload protection includes a first transmission shaft 11 and a second transmission shaft 12. Locking bevel gear rings 13 are clamped on the outer surfaces of the first transmission shaft 11 and the second transmission shaft 12. The two locking bevel gear rings 13 are adapted to each other. Rotating rings 14 are rotatably connected inside the first transmission shaft 11 and the second transmission shaft 12. Threaded rods 15 are slidably connected inside the first transmission shaft 11 and the second transmission shaft 12. The two threaded rods 15 are respectively threadedly connected inside the two rotating rings 14. Inclined blocks 16 are fixedly connected to the outer surfaces of the two threaded rods 15. Arc grooves 17 are formed inside the two locking bevel gear rings 13. Clamping mechanisms are slidably connected inside the first transmission shaft 11 and the second transmission shaft 12. The clamping mechanism includes two groups of ball beads 18. The two groups of ball beads 18 are respectively slidably connected inside the first transmission shaft 11 and the second transmission shaft 12. The two groups of ball beads 18 are respectively in contact with the outer surfaces of the two inclined blocks 16. The two groups of ball beads 18 are respectively clamped inside the two arc grooves 17. When the locking bevel gear rings 13 need to be replaced and maintained after long-term use, the rotating ring 14 is rotated. When the rotating ring 14 rotates, the thread drives the threaded rod 15 to slide towards the end away from the locking bevel gear ring 13. The sliding of the threaded rod 15 drives the inclined block 16 to slide. At this time, the ball beads 18 lose the extrusion force. When pulling out the locking bevel gear ring 13, the two ball beads 18 are squeezed to slide inwards and contract. By rotating the rotating ring 14, the locking bevel gear ring 13 can be pulled out for replacement and maintenance. The operation is simple and convenient. And when the rotating ring 14 is rotated in the reverse direction to squeeze the ball beads 18 to slide out and clamp the locking bevel gear ring 13, the arc groove 17 formed inside the locking bevel gear ring 13 is inclined. When the ball beads 18 slide outwards, the ball beads 18 are in contact with the inclined surface of the arc groove 17. During the sliding process, the locking bevel gear ring 13 is squeezed and guided to slide to the center of the installation position, which has the effect of automatically adjusting the position during the installation operation of the locking bevel gear ring 13, avoiding deviation during the installation of the locking bevel gear ring 13, improving the reliability of the installation, and ensuring the meshing of the two locking bevel gear rings 13.

[0027] A connecting ring 19 is fixedly connected to the outer surface of the second transmission shaft 12. The first transmission shaft 11 is sleeved inside the connecting ring 19. A first return spring 21 is sleeved on the outer surface of the first transmission shaft 11. The first transmission shaft 11 extends out of the connecting ring 19. The first transmission shaft 11 and the second transmission shaft 12 are connected through the connecting ring 19. At this time, the transmission shaft can be installed and used (the second transmission shaft 12 is installed and connected to the power source end, such as an engine, and the first transmission shaft 11 is installed in the operating equipment). During use, through the engagement of the two locking helical rings 13, the rotational power of the second transmission shaft 12 is transmitted to the first transmission shaft 11 to drive the first transmission shaft 11 to rotate synchronously. As the rotational speed of the second transmission shaft 12 increases, the torque generated by the second transmission shaft 12 increases. However, when the torque increases to the overload threshold, the locking helical ring 13 installed on the second transmission shaft 12 will push the locking helical ring 13 on the first transmission shaft 11 to slide away from the first transmission shaft 11. At this time, the second transmission shaft 12 is in an idling state, avoiding driving the first transmission shaft 11 to rotate in an overloaded state. During the sliding process, the first return spring 21 connected to the first transmission shaft 11 continuously pushes the locking helical ring 13 to slide back to its original position. When the rotational speed of the first transmission shaft 11 returns to a non-overloaded state, the first return spring 21 drives the locking helical ring 13 to slide back to its original position, and the two locking helical rings 13 resume the meshing state to transmit power. The slidable locking helical ring 13 on the first transmission shaft 11 can achieve the effect of overload protection and timely protect the transmission shaft.

[0028] Sleeves 22 are fixedly connected to the upper ends of both of the two screwing rings 14. Plug rods 23 are rotatably connected inside both of the two sleeves 22. Second return springs 24 are sleeved on the outer surfaces of both of the two plug rods 23. The two second return springs 24 are respectively sleeved inside the two sleeves 22. Round rods 25 are fixedly connected inside both of the two plug rods 23. A set of clamping grooves 26 are formed inside both the first transmission shaft 11 and the second transmission shaft 12. The two plug rods 23 are respectively clamped inside the two sets of clamping grooves 26. When there is no need to screw the screwing ring 14 for installation and disassembly operations, the screwing ring 14 is clamped in the clamping groove 26 through the plug rod 23 to prevent the screwing ring 14 from accidentally rotating. When it is necessary to rotate the screwing ring 14, the plug rod 23 is screwed 90 degrees. At this time, the round rod 25 can vertically slide out of the clamping groove 26. The plug rod 23 is pulled out of the clamping groove 26, and when it is in the extended state, the plug rod 23 is screwed 90 degrees back to its original position. At this time, the screwing ring 14 loses its limit and can rotate for clamping and releasing operations, which is beneficial to improving the stability and reliability of the device during use.

[0029] In view of the problems existing in the prior art, the utility model provides a transmission shaft with overload protection. When the locking helical gear ring 13 needs to be replaced and maintained after long-term use, rotate the rotating ring 14. When the rotating ring 14 rotates, the thread drives the threaded rod 15 to slide towards the end away from the locking helical gear ring 13. The sliding of the threaded rod 15 drives the inclined plane block 16 to slide. At this time, the ball 18 loses the extrusion force. When pulling out the locking helical gear ring 13, squeeze the two balls 18 to slide inwards and contract. By rotating the rotating ring 14, the locking helical gear ring 13 can be pulled out for replacement and maintenance. The operation is simple and convenient. The design of the ball 18 being in contact with the inclined plane of the arc groove 17 has the effect of automatically adjusting the position during the installation operation of the locking helical gear ring 13, avoiding deviation during the installation of the locking helical gear ring 13, improving the reliability of the installation, and ensuring the meshing of the two locking helical gear rings 13.

[0030] Working principle:

[0031] First step, extend the first transmission shaft 11 out of the connecting ring 19, and connect the first transmission shaft 11 and the second transmission shaft 12 through the connecting ring 19. At this time, the transmission shaft can be installed and used (the second transmission shaft 12 is installed and connected to the power source end, such as an engine, and the first transmission shaft 11 is installed in the operating equipment). During use, through the meshing of the two locking helical gear rings 13, the rotational power of the second transmission shaft 12 is transmitted to the first transmission shaft 11 to drive the first transmission shaft 11 to rotate synchronously. As the rotational speed of the second transmission shaft 12 increases, the torque generated by the second transmission shaft 12 increases. However, when the torque increases to the overload threshold, the locking helical gear ring 13 installed on the second transmission shaft 12 will push the locking helical gear ring 13 on the first transmission shaft 11 to slide towards the side away from the first transmission shaft 11. At this time, the second transmission shaft 12 is in an idling state, avoiding driving the first transmission shaft 11 to rotate in an overload state. During the sliding process, the first return spring 21 connected to the first transmission shaft 11 continuously pushes the locking helical gear ring 13 to slide back to its original position. When the rotational speed of the first transmission shaft 11 returns to the non-overload state, the first return spring 21 drives the locking helical gear ring 13 to slide back to its original position, and the two locking helical gear rings 13 resume the meshing state to transmit power. The slidable locking helical gear ring 13 on the first transmission shaft 11 can achieve the effect of overload protection and timely protect the transmission shaft.

[0032] Step 2, when the locking helical gear ring 13 needs to be replaced and maintained after long-term use, rotate the screwing ring 14. When the screwing ring 14 rotates, the thread drives the threaded rod 15 to slide towards the end away from the locking helical gear ring 13. The sliding of the threaded rod 15 drives the inclined plane block 16 to slide. At this time, the ball 18 loses the extrusion force. When pulling out the locking helical gear ring 13, the two balls 18 are squeezed to slide inwards and contract. By rotating the screwing ring 14, the locking helical gear ring 13 can be pulled out for replacement and maintenance. The operation is simple and convenient. And when the screwing ring 14 is rotated in the reverse direction to squeeze the balls 18 to slide outwards to clamp the locking helical gear ring 13, the arc groove 17 opened in the locking helical gear ring 13 is inclined. When the balls 18 slide outwards, the balls 18 fit with the inclined plane of the arc groove 17. During the sliding process, the locking helical gear ring 13 is squeezed and guided to slide to the center of the installation position, which has the effect of automatically adjusting the position during the installation operation of the locking helical gear ring 13, avoiding deviation during the installation of the locking helical gear ring 13, improving the reliability of the installation, ensuring the meshing of the two locking helical gear rings 13. When there is no need to rotate the screwing ring 14 for installation and disassembly operations, the screwing ring 14 is clamped in the card slot 26 through the insertion rod 23 to prevent the screwing ring 14 from accidentally rotating. When it is necessary to rotate the screwing ring 14, the insertion rod 23 is rotated 90 degrees. At this time, the round rod 25 can vertically slide out of the card slot 26. Pull the insertion rod 23 out of the card slot 26, and rotate the insertion rod 23 90 degrees to reset it in the extended state. At this time, the screwing ring 14 loses the limit and can be rotated for clamping and releasing work, which is beneficial to improving the stability and reliability of the device during use.

[0033] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A transmission shaft with overload protection, comprising a first transmission shaft (11) and a second transmission shaft (12), wherein the outer surfaces of the first transmission shaft (11) and the second transmission shaft (12) are both clamped with a locking helical gear ring (13), and the two locking helical gear rings (13) are adapted to each other, characterized in that: The first transmission shaft (11) and the second transmission shaft (12) are both rotatably connected with a screwing ring (14), the first transmission shaft (11) and the second transmission shaft (12) are both slidably connected with a threaded rod (15), the two threaded rods (15) are respectively threadedly connected to the inside of the two screwing rings (14), the outer surfaces of the two threaded rods (15) are both fixedly connected with a bevel block (16), and the two locking bevel gear rings (13) are both provided with an arc groove (17); Wherein, the first transmission shaft (11) and the second transmission shaft (12) are both slidably connected with a clamping mechanism inside; The clamping mechanism comprises two groups of balls (18), and the two groups of balls (18) are respectively slidably connected inside the first transmission shaft (11) and the second transmission shaft (12).

2. A transmission shaft with overload protection as claimed in claim 1, characterized in that: The two groups of balls (18) are respectively fitted with the outer surfaces of the two inclined plane blocks (16), and the two groups of balls (18) are respectively clamped in the inside of the two arc grooves (17); Wherein, a connecting ring (19) is fixedly connected to the outer surface of the second transmission shaft (12).

3. A transmission shaft with overload protection as claimed in claim 2, characterized in that: The first transmission shaft (11) is sleeved inside the connecting ring (19); Wherein, a first return spring (21) is sleeved on the outer surface of the first transmission shaft (11).

4. A transmission shaft with overload protection as claimed in claim 3, characterized in that: The upper ends of the two screw rings (14) are both fixedly connected with sleeves (22); Wherein, the two sleeves (22) are both rotatably connected with an insert rod (23) inside.

5. A transmission shaft with overload protection as claimed in claim 4, characterized in that: The outer surfaces of the two insertion rods (23) are sleeved with second return springs (24); The two second return springs (24) are respectively sleeved inside the two sleeves (22).

6. A transmission shaft with overload protection as claimed in claim 5, characterized in that: The two insertion rods (23) are both fixedly connected with round rods (25); Wherein, a group of slots (26) are provided inside each of the first transmission shaft (11) and the second transmission shaft (12), and the two insertion rods (23) are respectively engaged in the two groups of slots (26).

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