Axial locking device, piston rod assembly and oil cylinder having the same

Abstract

The present invention discloses an axial locking device, which includes a circumferential positioning disk and an outer disk body. An internal gear ring is provided on the inner side of the outer disk body. A paddle is rotatably connected to the circumferential positioning disk. The front end of the paddle contacts the internal gear ring. The circumferential positioning disk and the outer disk body rotate unidirectionally relative to each other in the circumferential direction. An elastic member is further provided on the side of the paddle. The lower end of the elastic member abuts against the circumferential positioning disk and presses the paddle against the internal gear ring through elastic force. The circumferential positioning disk is fixedly connected to the first component. A piston rod assembly is provided with the above-mentioned axial locking device. An oil cylinder is provided with the above-mentioned piston rod assembly. By the above method, the axial locking device of the present invention, as well as the piston rod assembly and the oil cylinder having the axial locking device, can improve the convenience of operation, improve the operation efficiency, improve the reliability of anti-loosening, and can achieve the effect of permanent anti-loosening on the premise that the components do not break or collapse.

Description

Technical Field

[0001] The invention relates to the field of anti-rotation and anti-axial loosening mechanisms, and in particular to an axial locking device and a piston rod assembly and an oil cylinder having the axial locking device. Background Art

[0002] In today's society, mechanical equipment is widely used in various fields of our daily life, and threaded connection is indeed an indispensable application for mechanical manufacturing and its mechanical equipment. Threaded connection firmly occupies various fields of mechanical manufacturing with its advantages of simple connection, high efficiency, compact structure and reliable connection. However, the disadvantages of threaded connection are also quite obvious, such as long-term use of threaded connectors, fatigue of thread teeth, increase of thread joint surface gap, etc. The comprehensive accumulation of these factors leads to thread loosening, especially in some cases where the thread is required to be in working state for a long time, and it is a high-risk occasion, and the anti-loosening of the thread is required to be very high. At present, various anti-loosening measures are adopted in various fields. Especially in important working environments, not only anti-loosening measures should be taken for the threads, but also regular or irregular inspections of the connecting threads should be carried out, which not only consumes manpower and material resources, but also increases a certain degree of risk factor in the working environment. At present, the commonly used thread loosening measures mainly include thread glue coating, destruction of thread teeth, destruction of parts surface and other measures to solve the problem. Taking the field of oil cylinder as an example, when the piston rod is connected to the piston, thread locking is particularly important, requiring a long service life, and ensuring good stability under some harsh working conditions.

[0003] Existing thread anti-loosening measures can only be guaranteed to be effective within a certain period of time. When used for a long time or in harsh working conditions, the part that prevents the thread from loosening will become fatigued, and the thread will loosen. Each time the anti-loosening measures are used, the thread itself or the metal surface will be damaged to varying degrees. In the least, it will affect the aesthetics of the parts, and in the worst, it will affect the performance of the parts and reduce the reuse rate. Generally speaking, the damage to the metal caused by anti-loosening measures is only for one-time anti-loosening. Disassembly and re-anti-loosening requires either replacing the anti-loosening deformation surface or replacing the parts. In comparison, the existing anti-loosening measures require cumbersome manual judgment and monitoring as well as a certain amount of external force, which is generally labor-intensive. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide an axial locking device and a piston rod assembly and an oil cylinder having the axial locking device, which can improve the convenience of operation, improve the operating efficiency, and improve the reliability of anti-loosening, and can achieve a permanent anti-loosening effect without the components being broken or crushed.

[0005] To solve the above technical problems, a technical solution adopted by the present invention is to provide an axial locking device, which includes a circumferential positioning disk and an outer disk body arranged coaxially. An internal gear ring is provided on the inner side of the outer disk body. A dial is rotatably connected to the circumferential positioning disk. The front end of the dial contacts the internal gear ring. The circumferential positioning disk and the outer disk body rotate unidirectionally relative to each other in the circumferential direction. An elastic member is further provided on the side of the dial. The lower end of the elastic member abuts against the circumferential positioning disk and presses the dial against the internal gear ring through elastic force. The circumferential positioning disk is fixedly connected to the first component, and the outer disk body is cooperatively connected to the second component. The second component is threadedly connected to the first component. The loosening rotation direction of the thread of the second component is opposite to the relative unidirectional rotation direction between the circumferential positioning disk and the outer disk body, so that the outer disk body restricts the second component from loosening from the first component.

[0006] In a preferred embodiment of the present invention, the dial and the elastic member are connected to the circumferential positioning disk through a first pin shaft.

[0007] In a preferred embodiment of the present invention, the tail of the dial has a toothed structure. A second pin shaft is installed on the circumferential positioning disk. A gear is cooperatively installed on the second pin shaft. The gear meshes with the toothed structure of the dial. The dial and the circumferential positioning disk also have pin holes, and a pin is inserted into the pin holes to limit the rotation of the dial.

[0008] In a preferred embodiment of the present invention, the elastic members are arranged on the left and right sides of the dial.

[0009] In a preferred embodiment of the present invention, the circumferential positioning disk has a concave accommodating groove inside. The dial, the internal gear, and the elastic member are all located in the accommodating groove. Installation holes corresponding to the first pin shaft and the second pin shaft are provided on the left and right end faces of the circumferential positioning disk.

[0010] In a preferred embodiment of the present invention, the inner ring of the circumferential positioning disk is sleeved on the first component, and the two are fixedly connected through a groove and a boss structure.

[0011] In a preferred embodiment of the present invention, the left side of the outer disk body has a threaded section, and the left end of the outer disk body is threadedly connected to the second component.

[0012] In a preferred embodiment of the present invention, the outer disk body includes a toothed disk and a connecting disk. The toothed disk and the connecting disk are fixedly connected by screws. The threaded section is located on the protruding part of the left end face of the connecting disk.

[0013] To solve the above technical problems, another technical solution adopted by the present invention is: to provide a piston rod assembly, including a piston rod and a piston mounted on the piston rod. The above-mentioned axial locking device is mounted on the piston rod assembly. The rear end of the piston rod is threadedly connected with a nut. The nut is located at the rear end of the piston, and the nut has an internal thread section. The rear end of the piston rod has a groove. The left end of the outer disc body of the axial locking device is threadedly connected with the internal thread section and their end faces are in contact. The inner ring of the circumferential positioning disc has a boss structure that cooperates with the groove. The circumferential positioning disc is fixed by the piston rod to prevent it from rotating. The rotation of the nut is transmitted to the outer disc body, and the nut is locked by the outer disc body to restrict the rotation of the nut.

[0014] To solve the above technical problems, another technical solution adopted by the present invention is: to provide an oil cylinder, including a cylinder body, and the above-mentioned piston rod assembly is arranged in the cylinder body.

[0015] The beneficial effects of the present invention are: the axial locking device of the present invention, the piston rod assembly and the oil cylinder having the axial locking device can improve the convenience of operation, improve the operation efficiency, improve the reliability of anti-loosening, and can achieve a permanent anti-loosening effect on the premise that the parts do not break or collapse. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0017] Figure 1 is a schematic structural diagram of a preferred embodiment of the axial locking device of the present invention;

[0018] Figure 2 is Figure 1 a partial cross-sectional view of the left view of

[0019] Figure 3 is Figure 1 an exploded view of

[0020] Figure 4 is a schematic diagram of the partial force analysis of the axial locking device of the present invention;

[0021] Figure 5 is a schematic diagram of the partial structure of the piston rod assembly;

[0022] Figure 6 is a schematic diagram of the partial structure of the oil cylinder;

[0023] The markings of the components in the attached drawings are as follows: 1. circumferential positioning disc, 2. outer disc body, 3. internal gear ring, 4. paddle, 5. elastic member, 6. first pin shaft, 7. toothed structure, 8. second pin shaft, 9. gear, 10. pin hole, 11. accommodating groove, 12. threaded section, 13. toothed disc, 14. connecting disc, 15. piston rod, 16. piston, 17. nut, 18. groove, 19. boss, 20. cylinder block, 21. internal threaded section, 22. screw. Detailed implementation manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figures 1 to 3 , an axial locking device, including a circumferential positioning disc 1 and an outer disc body 2 arranged coaxially. The inner side of the outer disc body 2 has an internal gear ring 3. A paddle 4 is rotatably connected to the circumferential positioning disc 1. The front end of the paddle 4 contacts the internal gear ring 3. The circumferential positioning disc 1 and the outer disc body 2 rotate unidirectionally relative to each other in the circumferential direction. The side of the paddle 4 is also provided with an elastic member 5. The lower end of the elastic member 5 abuts against the circumferential positioning disc 1 and makes the paddle 4 press against the internal gear ring 3 through the elastic force. The circumferential positioning disc 1 is fixedly connected to the first component, and the outer disc body 2 is cooperatively connected to the second component. The second component is threadedly connected to the first component. The loosening rotation direction of the thread of the second component is opposite to the relative unidirectional rotation direction between the circumferential positioning disc 1 and the outer disc body 2, so that the outer disc body 2 restricts the second component from loosening from the first component. The components such as the paddle and the gear arranged in the circumferential positioning disc 1 can be multiple, and their quantities and arrangement positions can be reasonably selected according to actual needs.

[0026] In addition, the paddle 4 and the elastic member 5 are connected to the circumferential positioning disc 1 through the first pin shaft 6.

[0027] In addition, the tail of the paddle 4 has a toothed structure 7. A second pin shaft 8 is installed on the circumferential positioning disc 1. A gear 9 is cooperatively installed on the second pin shaft 8. The gear 9 meshes with the toothed structure 7 of the paddle 4. Pin holes 10 are also designed on the paddle 4 and the circumferential positioning disc 1. A pin is inserted into the pin holes 10 to limit the rebound of the paddle 4.

[0028] In addition, the elastic member 5 is arranged on the left and right sides of the paddle 4.

[0029] In addition, the circumferential positioning disc 1 has a concave accommodating groove 11 inside. The paddle 4, the internal gear 7 and the elastic member are all located in the accommodating groove 11. Installation holes (not marked in the figure) corresponding to the first pin shaft 6 and the second pin shaft 8 are opened on the left and right end faces of the circumferential positioning disc 1.

[0030] In addition, the inner ring of the circumferential positioning disk 1 is sleeved on the first component, and the two are fastened together by a groove and boss structure.

[0031] In addition, the left side of the outer disc body has a threaded section 12, and the left end of the outer disc body is threadedly connected to the second component.

[0032] In addition, the outer disc body includes a toothed disc 13 and a connecting disc 14, the toothed disc and the connecting disc are fastened together by screws 22, and the threaded section is located at the raised portion of the left end surface of the connecting disc.

[0033] like Figure 5 A piston rod assembly includes a piston rod 15 and a piston 16 mounted on the piston rod. The piston rod assembly is equipped with an axial locking device as described above. The rear end of the piston rod 15 is threadedly connected with a nut 17. The nut 17 is located at the rear end of the piston 16, and the nut 17 has an internal thread section 21. The rear end of the piston rod 16 has a groove 18. The left end of the outer disk body of the axial locking device is threadedly connected with the internal thread section 21 and the end faces of the two are in contact. The inner ring of the circumferential positioning disk 1 has a boss 19 structure that matches the groove 18. The circumferential positioning disk 1 is fixed by the piston rod 1 so that it does not rotate. The rotation of the nut 17 is transmitted to the outer disk body 2, and the nut 17 is locked by the outer disk body 2 to limit the rotation of the nut 17. The boss 19 can be set on the piston rod 15, and the groove 18 can be set on the circumferential positioning disk 1. As long as the two can be tightly connected, other forms or structural connection methods can also be used to achieve a tight connection.

[0034] like Figure 6 , an oil cylinder comprises a cylinder body 20 and the above-mentioned piston rod assembly in the cylinder body.

[0035] The piston rod 15 has a groove 18 at its end surface, and the circumferential positioning plate 1 has a boss 19 matching the groove 18 on the end surface of the piston rod 15. The boss 19 is inserted into the groove 18 on the end surface of the piston rod 15 to ensure that the circumferential positioning plate 1 does not rotate circumferentially along the piston rod 15.

[0036] First, install the paddle 4 and the elastic member 5, the first pin 6, the second pin 8 (hexagonal recessed pin), and the gear 9 into the circumferential positioning disk 1, and then embed the circumferential positioning disk 1 into the toothed disk 13. During this process, move the paddle 5 to make it smoothly installed, and then cover the connecting disk 14, tighten the screws, and the circumferential positioning disk 1 and the paddle 4, pin 6, and pin 8 thereon are sealed between the connecting disk 14 and the toothed disk 13, so that the entire device is integrated into one piece, and the operation is more convenient and flexible. In addition, the two steps of the connecting disk 14 are positioned to cooperate with the circumferential positioning disk 1 to ensure good rotation coaxiality (Note: the cooperation at this point should ensure a high degree of finish). At this time, the toothed disk 13 and the connecting disk 14 can rotate circumferentially relative to the circumferential positioning disk, that is, from the perspective of the entire device, the outer ring can rotate unidirectionally relative to the inner ring.

[0037] The paddle 4, the toothed disc 13 and the elastic member 5 refer to the characteristics of the ratchet mechanism. During normal operation, the paddle 4 is attached to the inner gear ring 3 of the toothed disc 13 under the elastic force of the elastic member 5. When the toothed disc 13 rotates forward (note: at this time, the circumferential positioning disc 1 is stuck in the keyway of the piston rod end face and cannot rotate), the paddle 4 is normally pushed open by the inner gear ring 3 and rotates smoothly. When the toothed disc 13 rotates reversely, the toothed disc 1 is stuck under the cooperation of the paddle 4 and the elastic member 5, thereby playing a role in preventing loosening. In the above structure, the gear 9 is in a loose and rotatable state. The function of the gear 9 is: when the device needs to be removed from the piston rod 15, the second pin shaft 8 is rotated by the external hexagonal wrench, and the second pin shaft 8 drives the gear 9 to rotate (note: the second pin shaft 8 and the inner hole of the gear 9 are matched through the D-shaped shaft), and the gear 9 drives the paddle 4 to rotate, so that the paddle 4 is separated from the inner gear ring 3 of the toothed disc 13.

[0038] like Figure 4 In the process of related work, the following four points need to be guaranteed:

[0039] Guarantee point 1: Figure 2 , a force analysis is performed on a particle on the tooth of the inner gear ring 3. Under the condition of reliable locking, the force F generated by the reverse rotation of the toothed disc 13 at the particle is F. The force F can be decomposed into the force F1 along the sliding trend of the contact surface of the paddle and the supporting force F2 of the contact surface of the paddle. To ensure reliable locking, the force F generated on the toothed teeth by forcing the toothed disc 13 to reverse is such that the paddle 4 will not slide out of the tooth groove, then:

[0040] ———— Formula 1;

[0041] In the formula - the force generated by the elastic member 5 at the contact point between the paddle and the teeth of the toothed disc 13;

[0042] - Frictional force generated at the contact point between the paddle 4 and the teeth of the toothed disc 13;

[0043] ————Formula 2, where is the static friction factor.

[0044] Combining equations 1 and 2, we can determine that The maximum angle of

[0045] Guarantee point 2: When guarantee point 1 is met, it is also necessary to meet , so as to ensure that the paddle 4 can smoothly enter and exit the tooth groove of the toothed disc 13.

[0046] Guarantee Point 3: When Guarantee Points 1 and 2 are both satisfied and the strength of each material is met, it is also necessary to ensure that the material of the paddle 4 should have a higher strength than that of the gear disk 13, and at least ensure that the two materials are equal. This can ensure that during the working process, the paddle 4 will not be stuck in the tooth groove due to more serious tooth wear than that of the gear disk 13, which will cause inconvenience for disassembly.

[0047] Guarantee Point 4: Under the condition of ensuring strength, increase the number of teeth of the internal gear ring 3 as much as possible, which can improve the locking stability and anti-loosening accuracy.

[0048] Meeting the above 4 points can ensure the stability of the paddle operation to a certain extent, and at the same time improve the performance, usage times and service life of the entire device.

[0049] In addition, an obvious advantage of the present invention compared with other anti-loosening devices is that it will weaken the thread loosening force. Since the connecting disk 14 abuts the nut 17 at the joint surface and prevents the axial displacement of the nut 17, the first thing that the nut 17 needs to overcome when loosening is the friction force generated by approaching the initial pre-tightening force applied to the thread. In addition, at the same time, the entire locking device needs to be rotated circumferentially, and the locking device is already locked circumferentially, so this significantly improves the anti-loosening effect of the device.

[0050] The assembly process is as follows: First, tighten the nut 17 and apply the tightening torque. Then, align the boss 19 of the circumferential positioning disk 1 of the anti-loosening device with the groove 18 on the piston rod 15 and insert it. Lock the circumferential positioning disk 1 to ensure that the circumferential positioning disk 1 will not rotate circumferentially. Rotate the gear disk 13 forward. The connecting disk 14 will also rotate circumferentially under the drive of the gear disk 13 (Note: At this time, the circumferential positioning disk 1 is fixed in the groove 18 of the piston rod due to its boss 19 being locked). The threaded section 12 on the connecting disk 14 is screwed with the internal threaded section 21 on the nut. At the same time, the circumferential positioning disk 1 moves axially under the drive of the gear disk 13 and the connecting disk 14 until the connecting disk 14 is tightly attached to the end face of the nut 17, and the assembly process of the anti-loosening device is completed.

[0051] The disassembly process is as follows: When the anti-loosening device needs to be disassembled, first insert an internal hexagon wrench into the internal hexagon groove at one end of the second pin 8 externally to make it rotate. At this time, the driving gear 9 rotates and drives the paddle 4 to swing, so that the paddle 4 disengages from the internal gear ring 3 of the gear disk 13. When the pin holes 10 are aligned with the pin holes 10 on the circumferential positioning disk 1, insert the pin. At this time, the paddle 4 will no longer rebound. Use the tooling to rotate the gear disk 13 and remove the thread to disassemble the anti-loosening device.

[0052] The axial locking device of the present invention is convenient to disassemble and assemble, easy to operate, highly integrated, and simple and flexible to apply. The device of the invention is integrated. After assembly, all the screws and pin shafts are inside it and blocked in each component, so all the screws and pin shafts will not become loose or fall out. It achieves the effect of permanent loosening prevention. Without external force removal and when the components do not fail, the loosening prevention device will not become loose, and it has a quick replacement function. It is very convenient to disassemble and replace. It can be used repeatedly without causing any damage to the threads and the components themselves. It axially locks and positions the nut, and has the effect of preventing the pre-tightening force from slowly decreasing during the use of the parts. The loosening prevention effect is more obvious. It can be used not only for loosening prevention of the nut of the oil cylinder piston, but also for other mechanical industries with similar structures, and has a wide range of applications.

[0053] Different from the prior art, the axial locking device of the present invention, the piston rod assembly and the oil cylinder having the axial locking device can improve the convenience of operation, improve the operation efficiency, and improve the reliability of loosening prevention, and can achieve the effect of permanent loosening prevention on the premise that the components do not break or collapse.

[0054] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. An axial locking device, characterized in that, It includes a circumferential positioning disk and an outer disk body arranged coaxially. An internal gear ring is provided on the inner side of the outer disk body. A paddle is rotatably connected to the circumferential positioning disk. The front end of the paddle contacts the internal gear ring. The circumferential positioning disk and the outer disk body rotate relative to each other unidirectionally in the circumferential direction. An elastic member is further provided on the side of the paddle. The paddle and the elastic member are connected to the circumferential positioning disk through a first pin shaft. The lower end of the elastic member abuts against the circumferential positioning disk and presses the paddle against the internal gear ring through elastic force. The tail of the paddle has a toothed structure. A second pin shaft is installed on the circumferential positioning disk. A gear is fitted and installed on the second pin shaft. The gear meshes with the toothed structure of the paddle. There are also pin holes on the paddle and the circumferential positioning disk. A pin is inserted into the pin holes to limit the rebound of the paddle. The circumferential positioning disk has a concave accommodating groove inside. The paddle, the internal gear, and the elastic member are all located in the accommodating groove. Installation holes corresponding to the first pin shaft and the second pin shaft are provided on the left and right end faces of the circumferential positioning disk. The circumferential positioning disk is fixedly connected to the first component. The outer disk body is connected to the second component in a mating manner. The second component is threadedly connected to the first component. The loosening rotation direction of the thread of the second component is opposite to the relative unidirectional rotation direction between the circumferential positioning disk and the outer disk body, so that the outer disk body restricts the second component from loosening from the first component.

2. The axial locking device according to claim 1, characterized in that, The elastic members are arranged on the left and right sides of the paddle.

3. The axial locking device according to claim 1, characterized in that, The inner ring of the circumferential positioning disk is sleeved on the first component, and the two are fixedly connected through a groove and a boss structure.

4. The axial locking device according to claim 3, characterized in that, The left side of the outer disk body has a threaded section. The left end of the outer disk body is threadedly connected to the second component.

5. The axial locking device according to claim 4, characterized in that, The outer disk body includes a toothed disk and a connecting disk. The toothed disk and the connecting disk are fixedly connected by screws. The threaded section is located on the protruding part of the left end face of the connecting disk.

6. A piston rod assembly, comprising a piston rod and a piston mounted on the piston rod, characterized in that, The axial locking device as described in any one of claims 1-5 is installed on the piston rod assembly. A nut is threadedly connected to the rear end of the piston rod. The nut is located at the rear end of the piston, and an internal threaded section is provided inside the nut. A groove is provided at the rear end of the piston rod. The left end of the outer disk body of the axial locking device is threadedly connected to the internal threaded section and their end faces are in contact. The inner ring of the circumferential positioning disk has a boss structure that cooperates with the groove. The circumferential positioning disk is fixed by the piston rod to prevent it from rotating. The rotation of the nut is transmitted to the outer disk body, and the nut is locked by the outer disk body to restrict the rotation of the nut.

7. An oil cylinder, characterized in that, It includes a cylinder block, and the piston rod assembly as described in claim 6 is installed inside the cylinder block.

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