A worm gear reduction motor with balanced forward and reverse output torque

Abstract

The present application relates to a worm gear reduction motor with balanced forward and reverse output torque, comprising a motor and a reduction box, wherein the motor comprises a casing and a rotating shaft installed in the casing, the reduction box comprises a housing, an output shaft and a worm gear reduction mechanism arranged in the housing, the worm gear reduction mechanism is connected to the output shaft in a transmission manner; the worm gear reduction mechanism comprises a worm sleeve arranged in the housing and a reduction worm wheel rotatably connected in the housing and meshing with the worm sleeve; a limit seat is fixedly arranged in the housing, and a positioning blind hole is opened on one side of the limit seat; one end of the rotating shaft passes through the side wall of the housing and extends into the positioning blind hole, and is rotationally matched with the positioning blind hole; the worm sleeve is fixedly sleeved on the rotating shaft. The present application limits the rotating shaft by cooperating with the non-extending end of the casing through the limit seat, so that the output torque of the worm gear reduction motor in forward rotation is the same as that in reverse rotation or the difference is very small; and when the motor is blocked, the forward starting voltage of the motor is consistent with the reverse starting voltage of the motor.

Description

Technical Field

[0001] The present application relates to the field of reduction motors, and in particular to a worm gear reduction motor with balanced forward and reverse output torque. Background Art

[0002] A worm gear reducer refers to an integrated body of a worm gear reducer and a motor; a worm gear reducer is a power transmission mechanism that includes at least one set of mutually meshing worm wheels and worms.

[0003] At present, a considerable number of worm gear reducers on the market have worms that are directly connected to the motor shaft. In this type of worm gear reducer, when the motor shaft rotates forward and reverse, the motor shaft will be subjected to axial forces in different directions and will undergo axial displacement under the action of the axial force, causing the motor shaft to abut against the non-extending end cover of the motor casing or the limit piece on the motor shaft to abut against the extending end cover (or front end bearing) of the motor casing.

[0004] With respect to the above-mentioned related technologies, the inventor believes that there is a defect that the output torque of the worm gear reduction motor when rotating forward is greatly different from the output torque when rotating reversely. Summary of the invention

[0005] In order to reduce the difference between the output torque of a worm gear reduction motor during forward rotation and the output torque during reverse rotation, the present application provides a worm gear reduction motor with balanced output torque during forward and reverse rotation.

[0006] The present application provides a worm gear reduction motor with balanced forward and reverse output torque, which adopts the following technical solution:

[0007] A worm gear reduction motor with balanced forward and reverse output torque, comprising a motor and a reduction box, wherein the motor comprises a housing and a rotating shaft installed in the housing, and the reduction box comprises a housing, an output shaft and a worm gear reduction mechanism arranged in the housing, wherein the worm gear reduction mechanism is drivingly connected to the output shaft;

[0008] The worm gear reduction mechanism includes a worm sleeve arranged in an outer shell and a reduction worm wheel rotatably connected in the outer shell and meshing with the worm sleeve; a limit seat is fixedly arranged in the outer shell, and a positioning blind hole is opened on one side of the limit seat; one end of the rotating shaft passes through the side wall of the outer shell, and extends into the positioning blind hole, and is rotatably matched with the positioning blind hole; the worm sleeve is fixedly sleeved on the rotating shaft.

[0009] By adopting the above technical scheme, when the shaft rotates forward, the shaft is subjected to the reaction force of the reduction worm gear and abuts against the end cover of the non-extending end of the casing; when the shaft rotates reversely, the shaft is subjected to the reaction force of the reduction worm gear and abuts against the bottom of the positioning blind hole; since the areas of the end faces at both ends of the shaft are the same, the friction resistance encountered by the end faces of the shaft is the same when the shaft rotates forward and reverses, so the output torque of the worm gear reduction motor in forward rotation is the same as that in reverse rotation or the difference is very small, and when the motor is blocked, the forward starting voltage of the motor is consistent with the reverse starting voltage of the motor.

[0010] Preferably, one end of the rotating shaft extending into the positioning blind hole is sleeved with a first bearing.

[0011] By adopting the above technical solution, the friction resistance encountered by the rotating shaft during rotation can be effectively reduced, and the friction loss of the rotating shaft is also reduced.

[0012] Preferably, a limiting gasket is provided at the bottom of the positioning blind hole.

[0013] By adopting the above technical solution, the limit gasket can reduce the friction loss of the shaft end and the friction loss of the limit seat; in addition, the limit gasket is a consumable material and is easy to replace.

[0014] Preferably, a threaded hole communicating with the positioning blind hole is formed on a side of the limiting seat facing away from the worm sleeve, and a top screw is screwed into the threaded hole.

[0015] By adopting the above technical solution, after using it for a period of time, the user can screw the top screw into the positioning blind hole for a certain distance to compensate for the friction loss of the rotating shaft and the friction loss of the limiting gasket, so that the worm sleeve and the reduction worm wheel can maintain a better matching side clearance and operate, so as to achieve the optimal service life of the worm sleeve and the reduction worm wheel; similarly, the service life of the limiting gasket is also extended.

[0016] Preferably, a stop nut is screwed on the top screw, and a U-shaped support is provided on the side of the limit seat facing away from the worm sleeve. Both ends of the U-shaped support are fixedly connected to the limit seat, and a through hole is opened in the middle of the U-shaped support, and the top screw passes through the through hole, and the stop nut is located between the limit seat and the U-shaped support.

[0017] By adopting the above technical solution, the top screw is limited, thereby reducing the possibility that the top screw moves away from the rotating shaft after being hit by the rotating shaft.

[0018] Preferably, the worm sleeve and the rotating shaft are integrally formed or welded.

[0019] By adopting the above technical solution, the processing is convenient and the manufacturing cost is low.

[0020] Preferably, the motor further comprises a stator fixedly connected to the casing and a rotor arranged in the stator, the rotating shaft passes through the rotor and is fixedly connected to the rotor; a mounting blind hole is provided on the inner side of one end of the casing away from the outer casing, a shaft end gasket is provided at the bottom of the mounting blind hole, and one end of the rotating shaft away from the outer casing extends into the mounting blind hole and a second bearing is sleeved thereon.

[0021] By adopting the above technical solution, the second bearing can effectively reduce the friction resistance encountered by the rotating shaft during rotation, and also reduce the friction loss of the rotating shaft; the shaft end gasket can reduce the friction loss of the shaft end; in addition, the shaft end gasket is a consumable material and is easy to replace.

[0022] Preferably, the housing comprises a box body and a box cover bolted to the box body and a box cover bolted to an opening side of the box body.

[0023] By adopting the above technical solution, the manufacturing of the box body and the assembly of the worm gear reduction motor are facilitated.

[0024] Preferably, it also includes a gear reduction mechanism, which includes a primary reduction shaft, a secondary reduction shaft, a tertiary reduction shaft and a fourth reduction shaft rotatably connected in the housing; the reduction worm gear is fixed on the primary reduction shaft; a primary active reduction gear is fixedly connected to the primary reduction shaft; a secondary active reduction gear and a primary passive reduction gear meshing with the primary active reduction gear are fixed on the secondary reduction shaft; a third active reduction gear and a second passive reduction gear meshing with the second active reduction gear are fixed on the third reduction shaft; a fourth active reduction gear and a third passive reduction gear meshing with the third active reduction gear are fixed on the fourth reduction shaft; and a fourth passive reduction gear meshing with the fourth active reduction gear is fixed on the output shaft.

[0025] By adopting the above technical solution, the output speed of the motor can be reduced in multiple stages.

[0026] In summary, the present application includes at least one of the following beneficial effects:

[0027] 1. The output torque of the worm gear motor in forward rotation is the same as that in reverse rotation, or the difference is very small;

[0028] 2. The setting of the first bearing can effectively reduce the friction resistance encountered by the rotating shaft during rotation, and also reduce the friction loss of the rotating shaft;

[0029] 3. The limit gasket can reduce the friction loss of the shaft end and the friction loss of the limit seat; in addition, the limit gasket is a consumable material and is easy to replace;

[0030] 4. After using it for a period of time, the user can screw the top screw into the positioning blind hole for a distance to compensate for the friction loss of the rotating shaft and the friction loss of the limit gasket, so that the worm sleeve and the reduction worm wheel can operate under the best matching side clearance, so as to achieve the best service life of the worm sleeve and the reduction worm wheel; similarly, the service life of the limit gasket is also extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the worm gear reduction motor of the first embodiment of the present application.

[0032] Figure 2 It is a partial cross-sectional view of the worm gear reduction motor of the first embodiment of the present application.

[0033] Figure 3 It is an exploded schematic diagram of the worm gear reduction motor of the first embodiment of the present application.

[0034] Figure 4 It is a partial cross-sectional view of the worm gear reduction motor according to the embodiment of the present application.

[0035] Description of the accompanying drawings: 1. motor; 11. housing; 12. stator; 13. rotor; 14. rotating shaft; 15. mounting blind hole; 16. shaft end gasket; 17. second bearing; 18. third bearing; 19. stopper; 2. housing; 21. box body; 22. box cover; 3. output shaft; 4. worm gear reduction mechanism; 41. reduction worm wheel; 42. worm sleeve; 43. stopper seat; 431. positioning blind hole; 432. threaded hole; 44. stopper gasket; 45. first bearing; 46. ​​Top screw; 47. U-shaped support; 48. Stop nut; 5. Gear reduction mechanism; 51. Primary reduction shaft; 52. Secondary reduction shaft; 53. Thirdary reduction shaft; 54. Fourthary reduction shaft; 55. Primary active reduction gear; 56. Primary passive reduction gear; 57. Secondary active reduction gear; 58. Secondary passive reduction gear; 59. Thirdary active reduction gear; 60. Thirdary passive reduction gear; 61. Fourthary active reduction gear; 62. Fourthary passive reduction gear. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a worm gear reduction motor 1 with balanced forward and reverse output torque.

[0038] Embodiment 1:

[0039] Reference Figure 1 The worm gear reduction motor 1 includes a motor 1 and a reduction box.

[0040] Reference Figure 2The motor 1 includes a housing 11, a stator 12 fixedly connected to the housing 11, a rotor 13 disposed in the stator 12, and a rotating shaft 14 passing through the rotor 13 and fixedly connected to the rotor 13. One end of the rotating shaft 14 extends out from the housing 11. It is worth noting that both ends of the rotating shaft 14 are chamfered, and the areas of the end faces of the two ends of the rotating shaft 14 are the same. A mounting blind hole 15 is formed on the inner side of the non-extending end of the housing 11, and a shaft end gasket 16 is disposed at the bottom of the mounting blind hole 15. One end of the rotating shaft 14 located in the housing 11 extends into the mounting blind hole 15 and a second bearing 17 is sleeved thereon. A third bearing 18 is connected between the protruding end of the housing 11 and the rotating shaft 14, and a limiting member 19 is also fixedly connected to the rotating shaft 14. In this embodiment, the limiting member 19 is a limiting ring integrally formed on the rotating shaft 14, and the limiting ring is located between the rotor 13 and the third bearing 18, and a gap is left between the limiting ring and the third bearing 18.

[0041] The second bearing 17 and the third bearing 18 can greatly reduce the friction resistance of the rotating shaft 14 during rotation. The shaft end gasket 16 is made of brass, which is relatively soft and can play a better buffering effect and reduce the friction loss of the rotating shaft 14. Moreover, the shaft end gasket 16 is a consumable material, and the user can replace it when it is worn out.

[0042] Reference Figure 3 The reduction box includes a housing 2, an output shaft 3, and a worm gear reduction mechanism and a gear reduction mechanism 5 arranged in the housing 2. The housing 2 includes a box body 21 and a box cover 22. The box body 21 is provided with an opening, and the box cover 22 covers the opening and is bolted to the box body 21. One end of the output shaft 3 is rotatably connected to the bottom of the inner side of the box body 21, and the other end passes through the box cover 22 and is rotatably connected to the box cover 22.

[0043] The gear reduction mechanism 5 includes a four-stage reduction shaft 54, a three-stage reduction shaft 53, a two-stage reduction shaft 52 and a first-stage reduction shaft 51 which are rotatably connected between the box body 21 and the box cover 22 in a direction gradually away from the output shaft 3, a first-stage active reduction gear 55 is fixedly connected to the first-stage reduction shaft 51; a second-stage active reduction gear 57 and a first-stage passive reduction gear 56 meshing with the first-stage active reduction gear 55 are fixed to the second-stage reduction shaft 52; a three-stage active reduction gear 59 and a two-stage passive reduction gear 58 meshing with the two-stage active reduction gear 57 are fixed to the three-stage reduction shaft 53; a four-stage active reduction gear 61 and a three-stage passive reduction gear 60 meshing with the three-stage active reduction gear 59 are fixed to the four-stage reduction shaft 54; and a four-stage passive reduction gear 62 meshing with the four-stage active reduction gear 61 is fixed to the output shaft 3.

[0044] Reference Figure 2 and Figure 3A shaft hole is provided on the end surface of the housing 21 near the primary reduction shaft 51, and the rotating shaft 14 extends into the housing 21 through the shaft hole. The worm gear reduction mechanism includes a reduction worm wheel 41 fixedly sleeved on the primary reduction shaft 51 and a worm sleeve 42 sleeved on one end of the rotating shaft 14 extending into the housing 21 and meshing with the reduction worm wheel 41. The worm sleeve 42 is welded or integrally formed or key-connected with the rotating shaft 14. In this embodiment, welding is used as an example.

[0045] A limit seat 43 is fixedly connected to the bottom of the inner side of the box body 21, and a positioning blind hole 431 is opened on the side of the limit seat 43 facing the rotating shaft 14. A limit gasket 44 is set at the bottom of the positioning blind hole 431. One end of the rotating shaft 14 located in the box body 21 extends into the positioning blind hole 431 and is installed with a first bearing 45; it should be noted that when the rotating shaft 14 abuts against the shaft end gasket 16, the gap between the limit member 19 and the third bearing 18 is larger than the gap between the rotating shaft 14 and the limit gasket 44. The setting of the first bearing 45 can greatly reduce the friction resistance encountered by the rotating shaft 14 during rotation. The limit gasket 44 is made of brass, which is relatively soft in texture, can play a better buffering effect, and can also reduce the friction loss of the rotating shaft 14; and the limit gasket 44 is a consumable material, and when it is worn out, the user can replace it.

[0046] The implementation principle of the first embodiment is as follows: when the rotating shaft 14 rotates forward, the rotating shaft 14 is subjected to the reaction force of the reduction worm gear 41 and contacts the shaft end gasket 16. When the rotating shaft 14 rotates reversely, the rotating shaft 14 is subjected to the reaction force of the reduction worm gear 41 and contacts the limit gasket 44, while the limit member 19 does not contact the third bearing 18. Since the areas of the end faces at both ends of the rotating shaft 14 are the same, the friction resistance of the end faces of the rotating shaft 14 is the same when the rotating shaft 14 rotates forward and reverses, so that the output torque of the worm gear reduction motor 1 in forward rotation is the same as that in reverse rotation, or the difference is very small.

[0047] Embodiment 2:

[0048] Reference Figure 4 The difference between this embodiment and the first embodiment is that a threaded hole 432 connected to the positioning blind hole 431 is provided on the side of the limit seat 43 facing away from the worm sleeve 42, and a top screw 46 threadedly matched with the threaded hole 432 is screwed into the threaded hole 432. In addition, a U-shaped support member 47 is also provided on the side of the limit seat 43 facing away from the worm sleeve 42, and both ends of the U-shaped support member 47 are welded to the limit seat 43, and a through hole is provided in the middle of the U-shaped support member 47, and the top screw 46 passes through the through hole. A back-off nut 48 is also threadedly connected to the top screw 46, and the back-off nut 48 abuts against the middle of the U-shaped support member 47 on the side facing the limit seat 43.

[0049] As the worm gear reduction motor 1 is used, the positioning blind hole 431 will gradually become deeper due to wear, and the limiting gasket 44 will gradually become thinner due to wear, which will eventually lead to a larger axial movable amount of the rotating shaft 14 when it is working, resulting in a larger noise when the worm gear reduction motor 1 changes the rotation direction, and will increase the loss of the reduction worm 41 and the worm sleeve 42. Correspondingly, if the wear of the limiting gasket 44 is too large, the positioning blind hole 431 becomes deeper, which will cause the limiting member 19 to directly contact the third bearing 18 when the rotating shaft 14 reverses; thereby causing the friction force of the rotating shaft 14 when it rotates forward to be less than the friction force of the motor 1 when it reverses; ultimately resulting in a large difference between the output torque of the worm gear reduction motor 1 when it rotates forward and when it reverses.

[0050] The implementation principle of Example 2 is as follows: after using it for a period of time, the user can screw the top screw 46 into the positioning blind hole 431 for a distance to compensate for the friction loss of the rotating shaft 14, the limiting gasket 44 and the positioning blind hole 431, thereby ensuring that when the rotating shaft 14 is reversed, the limiting member 19 and the third bearing 18 do not directly contact each other, so that the output torque of the worm gear reduction motor 1 during forward rotation and the output torque during reverse rotation remain the same or have a small difference; moreover, by adopting this method, the service life of the limiting gasket 44 can be extended and the maintenance cost can be reduced.

[0051] In addition, the worm sleeve 42 and the reduction worm wheel 41 can be kept running under a better matching side clearance by screwing the top screw 46, so as to achieve the best service life of the worm sleeve 42 and the reduction worm wheel 41.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A worm gear reduction motor with balanced forward and reverse output torque, comprising a motor (1) and a reduction box, wherein the motor (1) comprises a housing (11) and a rotating shaft (14) installed in the housing (11), and wherein: The reduction box comprises a housing (2), an output shaft (3), and a worm gear reduction mechanism arranged in the housing (2), wherein the worm gear reduction mechanism is drivingly connected to the output shaft (3); The worm gear speed reduction mechanism comprises a worm sleeve (42) arranged in the housing (2) and a speed reduction worm wheel (41) rotatably connected in the housing (2) and meshing with the worm sleeve (42); a limit seat (43) is fixedly arranged in the housing (2), and a positioning blind hole (431) is opened on one side of the limit seat (43); one end of the rotating shaft (14) passes through the side wall of the housing (2) and extends into the positioning blind hole (431), and is rotatably matched with the positioning blind hole (431); the worm sleeve (42) is fixedly sleeved on the rotating shaft (14); A limiting gasket (44) is provided at the bottom of the positioning blind hole (431); A threaded hole (432) communicating with the positioning blind hole (431) is provided on a side of the limiting seat (43) facing away from the worm sleeve (42), and a top screw (46) is screwed into the threaded hole (432); A stop nut (48) is screwed onto the top screw (46); a U-shaped support member (47) is provided on the side of the limit seat (43) facing away from the worm sleeve (42); both ends of the U-shaped support member (47) are fixedly connected to the limit seat (43); a through hole is provided in the middle of the U-shaped support member (47); the top screw (46) passes through the through hole; and the stop nut (48) is located between the limit seat (43) and the U-shaped support member (47); One end of the rotating shaft (14) extending into the positioning blind hole (431) is sleeved with a first bearing (45).

2. A worm gear reduction motor with balanced forward and reverse output torque according to claim 1, characterized in that: The worm sleeve (42) and the rotating shaft (14) are integrally formed or welded.

3. The worm gear reduction motor with balanced forward and reverse output torque according to claim 1 is characterized in that: The motor (1) further comprises a stator (12) fixedly connected to the housing (11) and a rotor (13) arranged in the stator (12); the rotating shaft (14) is passed through the rotor (13) and is fixedly connected to the rotor (13); a mounting blind hole (15) is provided on the inner side of one end of the housing (11) away from the outer shell (2); a shaft end gasket (16) is provided at the bottom of the mounting blind hole (15); one end of the rotating shaft (14) away from the outer shell (2) extends into the mounting blind hole (15) and a second bearing (17) is sleeved thereon.

4. The worm gear reduction motor with balanced forward and reverse output torque according to claim 1 is characterized in that: The housing (2) comprises a box body (21) and a box cover (22) bolted to the box body (21) and a box cover (22) bolted to an opening side of the box body (21).

5. The worm gear reduction motor with balanced forward and reverse output torque according to claim 1 is characterized in that: Also includes The gear reduction mechanism (5) comprises a primary reduction shaft (51), a secondary reduction shaft (52), a tertiary reduction shaft (53) and a quaternary reduction shaft (54) rotatably connected in a housing (2); the reduction worm gear (41) is fixed on the primary reduction shaft (51); a primary active reduction gear (55) is fixedly connected to the primary reduction shaft (51); a secondary active reduction gear (57) and a quaternary reduction gear (54) are fixedly connected to the secondary reduction shaft (52); ) is meshed with a first-stage passive reduction gear (56); a third-stage active reduction gear (59) and a second-stage passive reduction gear (58) meshed with the second-stage active reduction gear (57) are fixed on the third-stage reduction shaft (53); a fourth-stage active reduction gear (61) and a third-stage passive reduction gear (60) meshed with the third-stage active reduction gear (59) are fixed on the fourth-stage reduction shaft (54); and a fourth-stage passive reduction gear (62) meshed with the fourth-stage active reduction gear (61) is fixed on the output shaft (3).

Images