Nut fastening mechanism applied to hand-operated speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a nut fastening mechanism applied to a hand-operated speed reducer. The utility model provides a nut fastening mechanism applied to a hand-operated speed reducer, which is arranged on a worm of the hand-operated speed reducer, is used for fastening a driven bevel gear on the worm, and comprises a first nut and a second nut, a first thread and a second thread are sequentially arranged at the end, used for installing the driven bevel gear, of the worm, the thread directions of the first thread and the second thread are opposite, the first nut is provided with an internal thread matched with the first thread, and the second nut is provided with an internal thread matched with the second thread. The anti-loosening effect is achieved through mutual matching of the two nuts opposite in rotating direction, it is ensured that the driven bevel gear and the worm are permanently, stably and firmly connected, and the problem that in the prior art, nuts are prone to loosening, and consequently the driven bevel gear and the worm rotate relatively is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a nut fastening mechanism applied to a hand-cranked reducer. Background Art

[0002] At present, there is a hand-cranked reducer, which is installed with a driven bevel gear on the worm of the worm gear reducer, and a movable rotating shaft is installed on the worm gear reducer, and an active bevel gear is installed on the rotating shaft, and the distance between the active bevel gear and the driven bevel gear is adjusted by adjusting the distance between the rotating shaft and the worm, so that the active bevel gear and the driven bevel gear are meshed, or the active bevel gear and the driven bevel gear are disengaged. When a power outage occurs, the input motor is first removed, and then the worker drives the rotating shaft to drive the active bevel gear to move in the direction close to the driven bevel gear until the active bevel gear on the rotating shaft is meshed with the driven bevel gear on the worm, and then the crank is used to drive the rotating shaft to rotate, thereby driving the driven bevel gear and the worm to rotate, and the worm rotates to drive the worm wheel and the output shaft to rotate, so that the reducer is in working condition.

[0003] In order to adapt to the existing worm gear reducer, reduce the processing of the worm and reduce the cost, the driven bevel gear is currently fixed by a nut at the end of the worm, that is, by processing threads at the end of the worm wheel and then using a nut to lock it. However, relying only on a single nut to tighten the driven bevel gear has a general tightening effect on the driven bevel gear, and the nut is prone to loosening, resulting in relative rotation between the driven bevel gear and the worm. Utility Model Content

[0004] (I) The problem to be solved by the utility model is that: currently, the driven bevel gear is fastened only by a single nut, which has a general fastening effect on the driven bevel gear and is prone to loosening of the nut, thereby causing the driven bevel gear and the worm to rotate relative to each other.

[0005] (II) Technical solution

[0006] A nut tightening mechanism applied to a hand-crank reducer, the nut tightening mechanism is installed on a worm of the hand-crank reducer and is used to tighten a driven bevel gear to the worm, comprising a first nut and a second nut, one end of the worm used to install the driven bevel gear is provided with a first thread and a second thread in sequence, the thread directions of the first thread and the second thread are opposite, the first nut has an internal thread that cooperates with the first thread, the second nut has an internal thread that cooperates with the second thread, and the nominal diameter of the first thread is greater than the nominal diameter of the second thread.

[0007] According to an embodiment of the utility model, a plurality of first oblique teeth are arranged on the end surface of the first nut facing the second nut, and the plurality of first oblique teeth are in an inclined step shape and are evenly arranged around the axis of the first nut;

[0008] A plurality of second oblique teeth are arranged on the end surface of the second nut facing the first nut, and the plurality of second oblique teeth are in an inclined step shape and are evenly arranged around the axis of the second nut;

[0009] The first bevel teeth and the second bevel teeth mesh with each other to prevent the first nut and the second nut from loosening.

[0010] According to an embodiment of the utility model, a disc is provided on the end surface of the first nut away from the second nut, a circular hole for the worm to pass through is coaxially opened on the disc, and the outer diameter of the disc is larger than the outer diameter of the first nut.

[0011] According to an embodiment of the present invention, a cutter retreat groove is provided at the connection between the first thread and the second thread, and the cutter retreat groove has a rounded transition.

[0012] According to an embodiment of the utility model, a buffer pad is provided on the end surface of the disc body away from the first nut, and the buffer pad has a hole for the worm to pass through.

[0013] According to an embodiment of the present invention, the width of the first oblique teeth is greater than the width of the second oblique teeth.

[0014] According to an embodiment of the present invention, the thread rotation direction of the first helical teeth is the same as the thread rotation direction of the first nut, and the thread rotation direction of the second helical teeth is the same as the thread rotation direction of the second nut.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a nut fastening mechanism applied to a hand-cranked reducer. The nut fastening mechanism is installed on the worm of the hand-cranked reducer and is used to fasten a driven bevel gear to the worm. The nut fastening mechanism comprises a first nut and a second nut. One end of the worm used to install the driven bevel gear is provided with a first thread and a second thread in sequence. The thread directions of the first thread and the second thread are opposite. The first nut has an internal thread that matches the first thread, and the second nut has an internal thread that matches the second thread. The nominal diameter of the first thread is greater than the nominal diameter of the second thread.

[0017] By successively opening a first thread and a second thread at the right end of the worm, and making the thread directions of the first thread and the second thread opposite, and then screwing a first nut on the first thread, and screwing a second nut on the second thread, the driven bevel gear is restricted between the first nut and the step surface of the worm, and the two double nuts with opposite rotation directions cooperate with each other to prevent loosening, ensuring that the connection between the driven bevel gear and the worm is permanently stable and reliable, and solving the problem of nut loosening that was prone to occur in the past, resulting in relative rotation between the driven bevel gear and the worm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A three-dimensional diagram provided for the second embodiment of the utility model;

[0020] Figure 2 A top view provided for the second embodiment of the utility model;

[0021] Figure 3 The second embodiment of the present invention provides Figure 2 Sectional view of AA in the middle;

[0022] Figure 4 A structural diagram of a worm, a driven bevel gear and a nut fastening mechanism provided in the second embodiment of the present utility model;

[0023] Figure 5 A structural diagram of a first nut, a second nut, a disc body and a buffer pad provided in Embodiment 1 of the utility model;

[0024] Figure 6 The second embodiment of the present invention provides Figure 2 Cross-sectional view of the middle BB;

[0025] Figure 7 The second embodiment of the present invention provides Figure 6 Enlarged view of part C;

[0026] Figure 8 The utility model provides a cross-sectional view of an existing hand-cranked reducer.

[0027] Icons: 1. Machine body; 2. Motor flange; 3. Worm; 301. Driven bevel gear; 302. Worm tooth surface; 4. Output shaft; 401. Worm wheel; 5. Hand-crank transmission device; 501. Fixed cover; 502. Locking bolt; 503. Unscrew sleeve; 504. Unscrew seat; 505. Fixing bolt; 506. Connecting bearing; 507. Rotating shaft; 508. Active bevel gear; 509. Oil seal one; 510. Oil seal two; 6. Adapter sleeve; 7. First bearing; 8. Retaining spring; 9. Bearing seat; 10. First oil seal; 11. Locking nut; 12. Second bearing; 13. Third bearing; 14. Second oil seal; 15. First nut; 151. Disk; 152. First helical tooth; 16. Second nut; 17. Buffer pad. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 3 , Figure 4 and Figure 5 As shown, embodiment 1 of the utility model provides a nut tightening mechanism applied to a hand-crank reducer, the nut tightening mechanism is installed on the worm 3 of the hand-crank reducer, and is used to tighten the driven bevel gear 301 to the worm 3, including a first nut 15 and a second nut 16, and one end of the worm 3 used to install the driven bevel gear 301 is provided with a first thread and a second thread in sequence, the thread directions of the first thread and the second thread are opposite, the first nut 15 has an internal thread matching the first thread, the second nut 16 has an internal thread matching the second thread, and the nominal diameter of the first thread is greater than the nominal diameter of the second thread.

[0030] The nut fastening mechanism is installed on the worm 3, and its function is to fasten the driven bevel gear 301 to the worm 3, so as to facilitate the installation of the worm 3 and the driven bevel gear 301, and ensure the connection strength between the driven bevel gear 301 and the worm 3, and avoid relative rotation between the driven bevel gear 301 and the worm 3.

[0031] It is important to note that if Figure 8As shown, in the conventional hand-crank reducer, a step surface is formed at the right end of the worm 3, and an external thread is provided at the right end of the worm 3. When installing the driven bevel gear 301, the driven bevel gear 301 is sleeved to the right end of the worm 3, and then a nut is screwed into the right end of the worm 3. As the nut is tightened, the driven bevel gear 301 is fastened between the step surface on the right side of the worm 3 and the nut. However, when a single nut is used to fasten the driven bevel gear 301, the nut is prone to loosening, which causes the driven bevel gear 301 and the worm 3 to rotate relative to each other.

[0032] In contrast, Figure 3 As shown, in this embodiment, by sequentially opening a first thread and a second thread at the right end of the worm 3, and making the thread directions of the first thread and the second thread opposite, then screwing a first nut 15 on the first thread, and screwing a second nut 16 on the second thread, the driven bevel gear 301 is restricted between the first nut 15 and the step surface of the worm 3, and the two double nuts with opposite rotation directions cooperate with each other to prevent loosening, thereby ensuring that the connection between the driven bevel gear 301 and the worm 3 is permanently stable and reliable, and solving the problem that the nut was easily loosened in the past, resulting in relative rotation between the driven bevel gear 301 and the worm 3.

[0033] It should be noted that the first thread and the second thread are arranged on the worm 3 in order from left to right, that is, the second thread is closer to the rightmost end of the worm 3, and in this embodiment, the nominal diameter of the first thread is greater than the nominal diameter of the second thread. In addition, a backlash groove is arranged at the connection between the first thread and the second thread, the backlash groove has a rounded transition, and the diameter of the portion of the worm 3 located on the right side of the backlash groove is slightly smaller than that of the portion of the worm 3 located on the left side of the backlash groove.

[0034] As a preferred embodiment, Figure 4 and Figure 5 As shown, a plurality of first bevel teeth 152 are evenly arranged in the circumference of the right side of the first nut 15, and the plurality of first bevel teeth 152 are evenly arranged in the circumference of the right side end surface of the first nut 15 in the shape of inclined steps, and a plurality of second bevel teeth are evenly arranged in the circumference of the left side end surface of the second nut 16, and the plurality of second bevel teeth are evenly arranged in the circumference of the left side end surface of the second nut 16 in the shape of inclined steps; the first bevel teeth 152 and the second bevel teeth are meshed with each other to prevent the first nut 15 and the second nut 16 from loosening.

[0035] The number of the first bevel teeth 152 is the same as the number of the second bevel teeth, and the first bevel teeth 152 and the second bevel teeth are meshed with each other to increase the locking force between the first nut 15 and the second nut 16. Since the first nut 15 and the second nut 16 have different sizes, the width of the first bevel teeth 152 is larger than the width of the second bevel teeth. The widths of the first bevel teeth 152 and the second bevel teeth are both the lengths of the bevel teeth perpendicular to the circumferential direction.

[0036] Preferably, in this embodiment, the first thread of the worm 3 is a right-hand thread, and the second thread of the worm 3 is a left-hand thread. The thread rotation direction of the first helical tooth 152 is the same as the thread rotation direction of the first thread.

[0037] Optionally, in this embodiment, the first thread is a left-hand thread and the second thread is a right-hand thread. The thread rotation direction of the first helical teeth 152 is the same as that of the first thread, and the thread rotation direction of the second helical teeth is the same as that of the second thread.

[0038] In practical applications, when the first thread is a right-handed thread and the second thread is a left-handed thread, when the first nut 15 is screwed outward, it needs to be rotated counterclockwise, the first beveled teeth 152 abut against the second beveled teeth, and the first nut 15 drives the second nut 16 to rotate counterclockwise to lock the first nut 15. When the second nut 16 is screwed outward clockwise, it needs to be rotated clockwise, the first beveled teeth 152 abut against the second beveled teeth, and the first nut 15 prevents the second nut 16 from rotating. When the first thread is a left-handed thread and the second thread is a right-handed thread, the first nut 15 is a left-handed nut and the second nut 16 is a right-handed nut, and the principle of permanent self-locking of the nut is consistent with the above, which will not be described in detail here.

[0039] Preferably, Figure 4 and Figure 5 As shown, a disc 151 is provided on the side of the first nut 15 facing the driven bevel gear 301. The disc 151 is disc-shaped, and the connection between the disc 151 and the first nut 15 is smoothly transitioned. A circular hole is provided on the disc 151. The circular hole and the threaded hole of the first nut 15 are coaxial, and the circular hole can allow the worm 3 to pass through. Furthermore, the outer diameter of the disc 151 is greater than the outer diameter of the first nut 15. The purpose of providing the disc 151 is to increase the contact area with the driven bevel gear 301 so that the driven bevel gear 301 can be tightened more stably.

[0040] Optionally, considering that the disk body 151 and the driven bevel gear 301 are in hard contact, it is easy to damage the right side of the driven bevel gear 301. Figure 4 As shown, a buffer pad 17 is installed on the side of the disc body 151 facing the driven bevel gear 301. The buffer pad 17 is in a circular ring shape and has an inner hole for the worm 3 to pass through.

[0041] Embodiment 2:

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, the second embodiment provides a hand-cranked reducer, including a body 1, a worm 3, an output shaft 4, a worm wheel 401 and a hand-cranked transmission device 5 installed on the body 1; the body 1 is sequentially formed with an output cavity and an input cavity in order from high to low, the output cavity and the input cavity are arranged vertically, the worm 3 is coaxially arranged in the input cavity, the output shaft 4 is coaxially arranged in the output cavity, the worm wheel 401 is arranged on the output shaft 4 and is coaxially arranged with the output shaft 4, and the worm wheel 401 is meshed with the worm 3; the right end of the worm 3 is sequentially provided with a first thread and a second thread, and then the driven bevel gear 301 is fastened and installed by the nut fastening mechanism applied to the hand-cranked reducer in the above-mentioned first embodiment, and the hand-cranked transmission device Device 5 includes a driving mechanism, a rotating shaft 507 and a driving bevel gear 508 arranged on one end of the rotating shaft 507. One end of the worm 3 is rotatably connected to the driving mechanism. A crank connection hole is provided on the end surface of the worm 3 away from the driving bevel gear 508. The driving mechanism is used to drive the rotating shaft 507 to move along the axial direction of the rotating shaft 507 so that the driving bevel gear 508 approaches or moves away from the driven bevel gear 301; when the driving mechanism drives the rotating shaft 507 to move to the first position, the driven bevel gear 301 and the driving bevel gear 508 are meshed; when the driving mechanism drives the rotating shaft 507 to move to the second position, the driven bevel gear 301 and the driving bevel gear 508 are disengaged.

[0043] In this embodiment, when power failure occurs, the input motor is first removed, and then the worker uses the driving mechanism to drive the rotating shaft 507 to drive the active bevel gear 508 to move in the direction close to the driven bevel gear 301, until the active bevel gear 508 on the rotating shaft 507 is meshed with the driven bevel gear 301 on the worm 3. At this time, the crank is inserted into the crank hole on the end face of the rotating shaft 507 and the crank is shaken to drive the rotating shaft 507 to rotate, thereby driving the driven bevel gear 301 and the worm 3 to rotate, and the worm 3 rotates to drive the worm wheel 401 and the output shaft 4 to rotate, so that the reducer can be in a working state. When the power is on, no manual drive is required. At this time, the driving mechanism can be used to drive the rotating shaft 507 to drive the active bevel gear 508 to move in the direction away from the driven bevel gear 301, until the active bevel gear 508 on the rotating shaft 507 is disengaged from the driven bevel gear 301 on the worm 3, and then the input motor can be reconnected to the worm 3.

[0044] It can be seen that in the present application, the worm gear reducer can be manually driven to work, and even if a power outage or failure occurs, workers can use manual operation to drive the reducer, which improves the adaptability of the worm gear reducer and its flexibility in use.

[0045] It should be noted that the right end of the worm 3 is provided with a first thread and a second thread in sequence from left to right, and the thread directions of the first thread and the second thread are opposite. The first nut 15 is screwed on the first thread, and the second nut 16 is screwed on the second thread. The driven bevel gear 301 is restricted between the first nut 15 and the step surface of the worm 3. The two double nuts with opposite rotation directions cooperate with each other to prevent loosening, thereby ensuring that the connection between the driven bevel gear 301 and the worm 3 is permanently stable and reliable.

[0046] As a preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the body 1 includes a base and an arc-shaped surrounding shell on the top of the base, an input cavity is formed in the base, and the left end of the input cavity has an opening, an output cavity is formed in the arc-shaped surrounding shell, and the axis of the output cavity is perpendicular to the axis of the input cavity, an output shaft 4 is rotatably mounted in the output cavity, and the front end of the output shaft 4 extends into the output cavity to form an input end, a worm gear 401 is coaxially arranged on the output shaft 4, and the lower half of the worm gear 401 extends into the input cavity of the base. Further, as Figure 1 As shown, a mounting hole is opened on the front side of the base, the mounting hole is perpendicular to the input cavity, and the mounting hole and the input cavity are connected, and the rotating shaft 507 passes through the mounting hole and extends into the input cavity.

[0047] Preferably, Figure 6 and Figure 7 As shown, the driving mechanism includes a fixed cover 501 and a screw-out member, the screw-out member includes a screw-out sleeve 503 and a screw-out seat 504, the fixed cover 501 is in a round cover shape, the screw-out seat 504 is in a circular ring shape, the screw-out sleeve 503 is in a circular tube shape, the fixed cover 501 is installed on the front of the base, and the fixed cover 501 is coaxially arranged with the mounting hole on the base. A circular hole is provided at the center of the fixed cover 501, the screw-out seat 504 is arranged inside the fixed cover 501 and is screwed with the inner wall of the fixed cover 501, one end of the screw-out sleeve 503 passes through the circular hole on the end face of the fixed cover 501 and extends into the inner wall of the fixed cover 501, and the end face of the screw-out sleeve 503 is fixedly connected to the side of the screw-out seat 504. Further, the rotating shaft 507 extends into the inside of the screw-out sleeve 503 and is rotatably connected with the screw-out sleeve 503.

[0048] It should be noted that if Figure 5 As shown, a crank connecting hole for use with a crank is provided on the end surface of the rotating shaft 507 away from the active bevel gear 508.

[0049] It should be noted that the rotating shaft 507 is perpendicular to the worm 3 , and the axis of the rotating shaft 507 and the axis of the worm 3 are coplanar.

[0050] In this way, when the power is off, the worker first removes the input motor, and then the worker rotates and unscrews the sleeve 503. Because the unscrew sleeve 503 and the unscrew seat 504 are fixed, and the unscrew seat 504 is screwed to the inner wall of the fixed cover 501, when the unscrew sleeve 503 is rotated, the unscrew sleeve 503 will move along the axial direction of the rotating shaft 507 together with the unscrew seat 504 and the rotating shaft 507, so that the active bevel gear 508 at the end of the rotating shaft 507 is close to the driven bevel gear 301, until the active bevel gear 508 is meshed with the driven bevel gear 301, and then the rotation of the unscrew sleeve 503 is stopped. Then the worker inserts one end of the crank into the crank connecting hole on the end face of the rotating shaft 507, and shakes the crank to drive the rotating shaft 507 to rotate. The active bevel gear 508 rotates with the rotation of the rotating shaft 507, thereby driving the driven bevel gear 301 and the worm 3 to rotate. The worm 3 rotates to drive the worm wheel 401 and the output shaft 4 to rotate, so that the reducer can be in working state.

[0051] When a call comes in, no manual drive is required. At this time, the sleeve 503 can be rotated in the reverse direction, and the sleeve 503 drives the screw-out seat 504 and the rotating shaft 507 to move away from the driven bevel gear 301, so that the driving bevel gear 508 on the rotating shaft 507 is separated from the driven bevel gear 301 on the worm 3, and finally the input motor is reconnected with the worm 3. It should be noted that the crank can be a Z-shaped crank commonly used on the market.

[0052] It can be seen that in this embodiment, the reducer can be driven to work by manual operation, and the reducer can be in working state even when the power is off, thereby improving the adaptability and flexibility of the reducer.

[0053] As a preferred embodiment, in order to facilitate the rotation and unscrewing of the sleeve 503, a rotating cover is screwed on the end of the unscrewing sleeve 503, and the rotating cover is in the shape of a round cover, and anti-slip protrusions are evenly arranged on the outer side of the rotating cover. In this way, the unscrewing sleeve 503 can be easily rotated and unscrewed.

[0054] Optionally, a plurality of fixing rods are provided on the side of the end of the unscrewing sleeve 503 exposed to the outside, and the plurality of fixing rods are evenly distributed around the axis of the unscrewing sleeve 503. In this way, the worker can hold the fixing rod to rotate the unscrewing sleeve 503, and the unscrewing sleeve 503 is more labor-saving.

[0055] Preferably, Figure 7As shown, multiple bolt holes are evenly provided around the mounting hole on the front side of the base of the machine body 1, and multiple countersunk holes corresponding to the bolt holes are evenly provided around the axis of the fixing cover 501. When installing the fixing cover 501, align the fixing cover 501 with the mounting hole on the base and fit the fixing cover 501 to the front side of the base, then rotate the fixing cover 501 so that the countersunk holes on the fixing cover 501 are aligned with the bolt holes on the front side of the base, and finally use the locking bolts 502 to fix the fixing cover 501. This facilitates the subsequent disassembly work and also facilitates the maintenance work.

[0056] Preferably, Figure 7 The screw-out seat 504 is in a circular ring shape, and an external thread is provided on the outer surface of the screw-out seat 504 . An internal thread groove is provided on the inner wall of one end of the fixed cover 501 close to the driven bevel gear 301 , so that the screw-out seat 504 can be screwed with the fixed cover 501 .

[0057] In addition, considering that the service life of the external thread of the screw-out seat 504 will be reduced after long-term wear, it needs to be replaced. In order to facilitate the disassembly of the screw-out sleeve 503 and the screw-out seat 504, the screw-out sleeve 503 and the screw-out seat 504 are designed to be detachable.

[0058] Specifically, a flange is provided on the outer side of the end of the screw-out sleeve 503 close to the screw-out seat 504, and a plurality of bolt holes are evenly provided on the end face of the screw-out seat 504 facing the screw-out sleeve 503, and the bolt holes correspond to the flange holes on the flange. In this way, when connecting the screw-out sleeve 503 and the screw-out seat 504, it is only necessary to make the flange of the screw-out sleeve 503 fit with the end face of the screw-out seat 504 and make the flange holes on the flange align with the bolt holes on the screw-out seat 504, and finally use the fixing bolts 505 to fix the flange to the screw-out seat 504.

[0059] As a preferred embodiment, Figure 7 As shown, a connecting bearing 506 is provided on the inner wall of the screw-out seat 504, and an oil seal 2 510 is provided on the inner wall of the screw-out sleeve 503. The axes of the oil seal 2 510 and the connecting bearing 506 are collinear. The connecting bearing 506 plays a role in supporting the rotating shaft 507. The end of the rotating shaft 507 away from the active bevel gear 508 passes through the oil seal 2 510.

[0060] Furthermore, an oil seal 509 is coaxially mounted on the inner wall of the circular hole at the center of the fixed cover 501 , and the oil seal 509 cooperates with the unscrewing sleeve 503 .

[0061] Preferably, Figure 3As shown, there is an input port on the left side of the machine body 1, which is connected to the input cavity, and the motor flange 2 is fixedly installed at the input port and is coaxially arranged with the input port. The second bearing 12 and the third bearing 13 are installed in sequence in the input cavity, and the second bearing 12 and the third bearing 13 are symmetrically arranged about the input cavity. The two ends of the worm 3 pass through the second bearing 12 and the third bearing 13 respectively, the second bearing 12 is close to the input port, and the third bearing 13 is far away from the input port. The worm 3 has a worm tooth surface 302 meshing with the worm wheel 401, and the worm tooth surface 302 is located between the second bearing 12 and the third bearing 13, and the worm tooth surface 302 is meshing with the worm wheel 401.

[0062] Furthermore, a first bearing 7 is installed on the inner wall of the motor flange 2, and an adapter sleeve 6 is connected in the first bearing 7. One end of the adapter sleeve 6 is connected to one end of the worm 3, and the adapter sleeve 6 is used to connect to the input motor.

[0063] In this way, the input motor drives the adapter sleeve 6 to drive the worm 3 to rotate, and the rotation of the worm 3 drives the worm wheel 401 to rotate, and finally drives the output shaft 4 to rotate.

[0064] As a preferred embodiment, a first oil seal 10 and a second oil seal 14 are respectively sleeved on both ends of the worm 3, wherein the first oil seal 10 is located on the left side of the second bearing 12, and the second oil seal 14 is located on the right side of the third bearing 13, so that the part of the input cavity located between the first oil seal 10 and the second oil seal 14 is in a sealed environment. It should be noted that the main function of the oil seal is to seal the oil, that is, to isolate the parts of the transmission parts that need to be lubricated from the external environment to prevent the leakage of lubricating oil, and at the same time prevent external dust, impurities, etc. from entering the machine, thereby ensuring the normal operation of the equipment and extending the service life of the equipment.

[0065] It should be noted that the motor flange 2 and the body 1 are connected through the bearing seat 9. Specifically, the bearing seat 9 includes a rectangular plate and a bearing sleeve. A circular hole is opened on the rectangular plate. One end of the bearing sleeve is fixed to the rectangular plate, and the bearing sleeve is coaxially arranged with the circular hole on the rectangular plate. A first circular hole is opened at the four corners of the rectangular plate. Four bolt holes are evenly arranged around the input port on the left side of the base. Further, four second circular holes are arranged on the end face of the motor flange 2 close to the bearing seat 9, and the first circular holes and the second circular holes correspond to each other one by one. When installing the motor flange 2, it is only necessary to insert the bearing sleeve of the bearing seat 9 into the input cavity. At this time, the four first circular holes on the bearing seat 9 are aligned with the four bolt holes on the left side of the base. Then, the motor flange 2 is attached to the rectangular plate of the bearing seat 9, and the four second circular holes on the motor flange 2 are aligned with the four first circular holes on the rectangular plate. Finally, the bolts are inserted into the second circular holes and tightened to fix the motor flange 2 and the bearing seat 9 to the body 1 together. This makes subsequent disassembly and maintenance work easier.

[0066] Optional, such as Figure 3 As shown, in order to prevent the second bearing 12 from deflecting, a protrusion is provided on the outer peripheral surface of the worm 3, and the right side of the second bearing 12 contacts the protrusion, and a locking nut 11 is also screwed on the worm 3, and the locking nut 11 is located on the left side of the second bearing 12. In this way, by tightening the locking nut 11, the locking nut 11 tightly presses against the second bearing 12, so that the second bearing 12 is limited between the protrusion and the locking nut 11.

[0067] Optionally, a retaining spring 8 is provided on the inner wall of the motor flange 2, the adapter sleeve 6 passes through the retaining spring 8, and the retaining spring 8 is attached to the left side surface of the first bearing 7. The retaining spring 8 serves to limit the adapter sleeve 6.

[0068] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nut tightening mechanism for a hand-cranked reducer, characterized in that: The nut fastening mechanism is mounted on a worm (3) of a hand-cranked reducer and is used to fasten a driven bevel gear (301) to the worm (3); a step surface is formed on one end of the worm; The nut fastening mechanism comprises a first nut (15) and a second nut (16), and the nut fastening mechanism is used to restrict the driven bevel gear (301) between the first nut (15) and the step surface of the worm; One end of the worm (3) for mounting the driven bevel gear (301) is provided with a first thread and a second thread in sequence, the first thread and the second thread have opposite thread directions, the first nut (15) has an internal thread matching the first thread, the second nut (16) has an internal thread matching the second thread, and the nominal diameter of the first thread is greater than the nominal diameter of the second thread; A disc body (151) is provided on the end surface of the first nut (15) away from the second nut (16); the disc body (151) is disc-shaped, and the connection between the disc body (151) and the first nut (15) is smoothly transitioned; a circular hole is coaxially provided on the disc body (151) for the worm (3) to pass through; and the outer diameter of the disc body (151) is greater than the outer diameter of the first nut (15); A buffer pad (17) is provided on the end surface of the disc body (151) away from the first nut (15), and the buffer pad (17) has a hole for the worm (3) to pass through.

2. A nut tightening mechanism for a hand-cranked reducer according to claim 1, characterized in that: A plurality of first oblique teeth (152) are arranged on the end surface of the first nut (15) facing the second nut (16), and the plurality of first oblique teeth (152) are in an inclined step shape and are evenly arranged around the axis of the first nut (15); A plurality of second oblique teeth are arranged on the end surface of the second nut (16) facing the first nut (15), the plurality of second oblique teeth are in an inclined step shape and are evenly arranged around the axis of the second nut (16); The first bevel teeth (152) and the second bevel teeth mesh with each other, and are used to prevent the first nut (15) and the second nut (16) from loosening.

3. A nut tightening mechanism for a hand-cranked reducer according to claim 2, characterized in that: A cutter retreat groove is provided at the connection between the first thread and the second thread, and the cutter retreat groove has a rounded transition.

4. A nut tightening mechanism for a hand-cranked reducer according to claim 2, characterized in that: The width of the first oblique teeth (152) is greater than the width of the second oblique teeth.

5. The nut tightening mechanism for a hand-cranked reducer according to claim 2, characterized in that: The thread rotation direction of the first bevel teeth (152) is the same as the thread rotation direction of the first nut (15), and the thread rotation direction of the second bevel teeth is the same as the thread rotation direction of the second nut (16).

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