Double-lead speed reducer

Abstract

The utility model discloses a double-lead speed reducer which comprises a box body and a worm movably arranged on the box body, and further comprises a bearing seat for axially adjusting the worm, the right end of the bearing seat is in threaded connection with the inner wall of the left end of the box body, and the left end of the worm is rotationally arranged on the bearing seat through a first ball bearing. The right end of the bearing seat is movably arranged on the inner wall of the right end of the box body through a second ball bearing, a sealing piece is arranged between the bearing seat and the box body, and the left end of the bearing seat is sleeved with a first round nut which is in threaded connection with the bearing seat and abuts against the end face of the left end of the box body. According to the scheme, the worm adopts a double-lead design, and the size of the meshing backlash of the worm gear and the worm can be adjusted by axially moving the worm, so that the transmission precision is improved; the bearing seat improves the supporting performance of the worm, and meanwhile the sealing effect between parts is improved through the sealing piece; and the second round nut can apply a certain pre-tightening force to the first ball bearing, so that the rigidity of the worm is improved, and an anti-loosening effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a double-lead reducer. Background Art

[0002] The reducer is an independent component consisting of a gear drive, a worm drive, or a gear-worm drive enclosed in a rigid housing. It is often used as a reduction transmission device between the prime mover and the working machine. It plays the role of matching the speed and transmitting the torque between the prime mover and the working machine or the actuator, and is widely used in modern machinery. When the reducer is to meet the use scenario of circuit board diode assembly, the scenario requires precise positioning, so a high-precision adjustable double-lead reducer is designed. The worm adopts a double-lead design, and the size of the meshing side clearance can be adjusted by axial movement of the worm, thereby improving the transmission accuracy. The existing double-lead reducer has poor supporting sealing effect, and long-term use can easily cause the worm to loosen, which in turn leads to reduced meshing accuracy of the worm gear.

[0003] For example, Chinese patent publication number CN109667923A, publication date April 23, 2019, named "A worm gear side clearance adjustment device", includes: a worm wheel, a worm, a nut, a bearing, and a stop washer, wherein the worm wheel is installed in a housing and meshes with the worm; nuts, stop washers and bearings are provided at both ends of the worm from the outside to the inside in sequence; the two bearings install the worm in the housing, and the worm can move axially in the inner ring of the bearing; the two nuts are used to adjust the bearing clearance and tooth side clearance.

[0004] The disadvantages of the existing patents are that the supporting sealing effect of the existing double-lead reducer is poor, and long-term use can easily cause the worm to loosen, thereby reducing the meshing accuracy of the worm gear. Utility Model Content

[0005] The utility model aims to solve the problem that the existing double-lead reducer has poor supporting and sealing effect, which may cause the worm to loosen after long-term use, thereby reducing the meshing accuracy of the worm and worm gears, and to provide a double-lead reducer with improved supporting performance and sealing effect and improved meshing accuracy of the worm and worm gears.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A double-lead reducer includes a housing and a worm movably arranged on the housing, and also includes a bearing seat for axially adjusting the worm, the right end of the bearing seat is threadedly connected to the inner wall of the left end of the housing, the left end of the worm is rotatably arranged on the bearing seat through a first ball bearing, and the right end is movably arranged on the inner wall of the right end of the housing through a second ball bearing, a sealing member is provided between the bearing seat and the housing, and the left end of the bearing seat is sleeved with a first round nut, the first round nut is threadedly connected to the bearing seat and abuts against the left end face of the housing. In the double-lead reducer described in this scheme, the worm adopts a double-lead design, and the worm can adjust the side clearance of the worm gear meshing by axial movement, thereby improving the transmission accuracy. In order to solve the problem of support sealing caused by the axial movement of the worm, a bearing seat is designed at the left end of the worm, and the axial movement is adjusted by adjusting the bearing seat, and locked by the first round nut, and the first ball bearing and the second ball bearing inside will bear all the axial load and part of the radial load of the worm. The first round nut and the bearing seat are locked and matched, which has an anti-loosening effect. Compared with the existing technology, which needs to consider the unstable supporting performance and poor sealing effect between the bearing, worm and housing, the bearing seat in this solution improves the supporting performance of the worm and maintains the sealing effect between the components through the seal. The locking of the first round nut and the thread locking between the bearing seat and the housing further improve the rigidity of the worm, which is not easy to loosen after long-term use.

[0008] Preferably, a sealing cover is provided at the left end of the bearing seat, and the left end of the worm is located inside the sealing cover. The bearing seat is through-through, and the sealing cover is buckled at the left end opening of the bearing seat, and the sealing cover increases the sealing performance of the bearing seat.

[0009] Preferably, a sealing groove is provided on the outer wall of the middle part of the bearing seat, and the sealing member is located in the sealing groove. The sealing groove is annular, and the sealing member can be an O-ring, and the sealing member is arranged in the sealing groove. There are multiple sealing grooves, which further improves the sealing effect of the bearing seat.

[0010] Preferably, a bearing cap is provided on the right side of the first ball bearing, and the bearing cap is sleeved on the worm. A limiting shoulder is provided on the worm, and the first ball bearing and the bearing cap are limited on the limiting shoulder.

[0011] Preferably, the left end of the worm is provided with a second round nut for limiting the first ball bearing on the worm and a stop washer matched with the second round nut. The second round nut and the stop washer limit the first ball bearing and the bearing cover on the limit shoulder, and when the worm is axially moved and adjusted, the first ball bearing and the bearing cover do not move with the worm. There are two second round nuts, and the two second round nuts can apply a certain preload force to the first ball bearing, thereby improving the rigidity of the worm and having an anti-loosening effect.

[0012] Preferably, the second ball bearing is limited in the housing by an elastic retaining ring, a limiting groove is provided on the inner wall of the housing, and the elastic retaining ring is located in the limiting groove. The elastic retaining ring limits the second ball bearing in the housing, and when the worm is axially moved and adjusted, the second ball bearing and the housing do not move.

[0013] Preferably, the right end of the worm is sleeved with a first double-lip skeleton oil seal, the first double-lip skeleton oil seal is located at the right end of the second ball bearing, and the elastic retaining ring is located between the second ball bearing and the first double-lip skeleton oil seal. The first double-lip skeleton oil seal improves the sealing effect of the right side of the second ball bearing.

[0014] Preferably, an oil seal cover is provided at the right end of the box, the left end of the oil seal cover is plugged into the right end opening of the box, and the oil seal cover is screwed to the right end of the box. The oil seal cover is used to limit the first double-lip skeleton oil seal on the inner wall of the right end of the box.

[0015] Preferably, a second double-lip skeleton oil seal is provided on the inner wall of the oil seal cover, and the second double-lip skeleton oil seal is sleeved on the worm. A limiting groove is provided on the inner wall of the oil seal cover, and a limiting block is provided on the outer wall of the second double-lip skeleton oil seal, and the limiting groove cooperates with the limiting block, and the second double-lip skeleton oil seal is limited on the oil seal cover through the cooperation of the limiting block and the limiting groove, so as to further improve the sealing effect of the worm.

[0016] Preferably, the worm is a double-lead worm, a worm wheel is provided in the housing, and the worm is meshed with the worm wheel. The worm adopts a double-lead design, and the axial movement of the worm can adjust the meshing side clearance of the worm wheel, thereby improving the transmission accuracy.

[0017] Therefore, the utility model has the following beneficial effects: the worm adopts a double-lead design, and the axial movement of the worm can adjust the size of the worm gear meshing side clearance, thereby improving the transmission accuracy; the bearing seat improves the supporting performance of the worm and improves the sealing effect between the components through the seal; the second round nut can apply a certain preload force to the first ball bearing, thereby improving the rigidity of the worm and having an anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a sectional view of the utility model.

[0019] Figure 2 It is another cross-sectional view of the utility model.

[0020] As shown in the figure:

[0021] Box 1, worm 2, worm wheel 3,

[0022] Bearing seat 4, sealing groove 4.1,

[0023] The first ball bearing 5, the second ball bearing 6, the first round nut 7, the sealing cover 8, the bearing cover 9, the second round nut 10, the stop washer 11, the elastic retaining ring 12, the first double-lip skeleton oil seal 13, the oil seal cover 14, the second double-lip skeleton oil seal 15, the metal oil mark 16, and the hexagon socket taper thread oil plug 17. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Embodiment 1, as Figure 1 , Figure 2 A dual-lead reducer shown in the figure includes a housing 1 and a worm 2 movably arranged on the housing 1, and also includes a bearing seat 4 for axially adjusting the worm 2, the right end of the bearing seat 4 is threadedly connected to the left end inner wall of the housing 1, the left end of the worm 2 is rotatably arranged on the bearing seat 4 through a first ball bearing 5, and the right end is movably arranged on the right end inner wall of the housing 1 through a second ball bearing 6, a seal is provided between the bearing seat 4 and the housing 1, and the left end of the bearing seat 4 is sleeved with a first round nut 7, the first round nut 7 is threadedly connected to the bearing seat 4 and abuts against the left end face of the housing 1.

[0026] In the double-lead reducer described in the above embodiment, the worm 2 adopts a double-lead design, and the worm 2 can adjust the meshing side clearance of the worm wheel 3 and the worm 2 by axial movement, thereby improving the transmission accuracy. In order to solve the support sealing problem caused by the axial movement of the worm 2, a bearing seat 4 is designed at the left end of the worm 2. The axial movement is adjusted by adjusting the bearing seat 4, and the first round nut 7 is locked. The first ball bearing 5 and the second ball bearing 6 inside will bear all the axial loads and part of the radial loads of the worm 2. The first round nut 7 and the bearing seat 4 are locked and matched, and have an anti-loosening effect. Compared with the prior art, the problem of unstable supporting performance and poor sealing effect between the bearing and the worm 2 and the housing 1 needs to be considered. The bearing seat 4 in this solution improves the supporting performance of the worm 2 while maintaining the sealing effect between the parts through the seal. The locking of the first round nut 7 and the thread locking between the bearing seat 4 and the housing 1 further improve the rigidity of the worm 2, and it is not easy to loosen after long-term use. The invention solves the problem that the supporting sealing effect of the existing double-lead reducer is poor, the worm 2 is easily loosened after long-term use, and the meshing accuracy of the worm wheel 3 and the worm 2 is reduced.

[0027] In this embodiment, Figure 1 As shown, a sealing cover 8 is provided at the left end of the bearing seat 4, and the left end of the worm 2 is located inside the sealing cover 8. The bearing seat 4 is through-through, and the sealing cover 8 is buckled at the left end opening of the bearing seat 4, and the sealing cover 8 increases the sealing performance of the bearing seat 4. A bearing cover is provided on the right side of the first ball bearing 5, and the bearing cover is sleeved on the worm 2. A limiting shoulder is provided on the worm 2, and the first ball bearing 5 and the bearing cover are limited on the limiting shoulder.

[0028] Specifically, Figure 1 As shown, a sealing groove 4.1 is provided on the middle outer wall of the bearing seat 4, and the sealing member is located in the sealing groove 4.1. The sealing groove 4.1 is annular, and the sealing member can be an O-ring, which is arranged in the sealing groove 4.1. There are multiple sealing grooves 4.1, which further improves the sealing effect of the bearing seat 4.

[0029] Further, such as Figure 1 As shown, the left end of the worm 2 is provided with a second round nut 10 for limiting the first ball bearing 5 on the worm 2 and a stop washer 11 matched with the second round nut 10. The second round nut 10 and the stop washer 11 limit the first ball bearing 5 and the bearing cover on the limiting shoulder. When the worm 2 is axially moved and adjusted, the first ball bearing 5 and the bearing cover do not move with the worm 2. There are two second round nuts 10, and the two second round nuts 10 can apply a certain preload force to the first ball bearing 5, improve the rigidity of the worm 2, and have an anti-loosening effect.

[0030] In this embodiment, Figure 1 , Figure 2 As shown, the worm 2 is a double-lead worm 2, a worm wheel 3 is provided in the housing 1, and the worm 2 is meshingly connected to the worm wheel 3. The worm 2 adopts a double-lead design, and the axial movement of the worm 2 can adjust the meshing side clearance of the worm wheel 3 and the worm 2, thereby improving the transmission accuracy.

[0031] In summary, the utility model has the following beneficial effects: the worm 2 adopts a double-lead design, and the axial movement of the worm 2 can adjust the size of the meshing side clearance of the worm wheel 3 and the worm 2, thereby improving the transmission accuracy; the bearing seat 4 improves the supporting performance of the worm 2 while improving the sealing effect between the components through the seal; the second round nut 10 can apply a certain pre-tightening force to the first ball bearing 5, thereby improving the rigidity of the worm 2 and having an anti-loosening effect.

[0032] The basic structure is based on the first embodiment, and the right end of the worm 2 is further optimized, such as Figure 1 , Figure 2 As shown, a dual-lead reducer includes a housing 1 and a worm 2 movably arranged on the housing 1, and also includes a bearing seat 4 for axially adjusting the worm 2, the right end of the bearing seat 4 is threadedly connected to the left end inner wall of the housing 1, the left end of the worm 2 is rotatably arranged on the bearing seat 4 through a first ball bearing 5, and the right end is movably arranged on the right end inner wall of the housing 1 through a second ball bearing 6, a seal is provided between the bearing seat 4 and the housing 1, and the left end of the bearing seat 4 is sleeved with a first round nut 7, the first round nut 7 is threadedly connected to the bearing seat 4 and abuts against the left end face of the housing 1.

[0033] In this embodiment, Figure 1 As shown, a sealing cover 8 is provided at the left end of the bearing seat 4, and the left end of the worm 2 is located inside the sealing cover 8. The bearing seat 4 is through-through, and the sealing cover 8 is buckled at the left end opening of the bearing seat 4, and the sealing cover 8 increases the sealing performance of the bearing seat 4. A bearing cover is provided on the right side of the first ball bearing 5, and the bearing cover is sleeved on the worm 2. A limiting shoulder is provided on the worm 2, and the first ball bearing 5 and the bearing cover are limited on the limiting shoulder.

[0034] Further, such as Figure 1As shown, a stopper is provided on the inner wall of the bearing seat 4, and there are two first ball bearings 5, which are respectively located on both sides of the stopper. When the bearing seat 4 is axially moved and adjusted, one of the first ball bearings 5 ​​is compressed, and the other ball bearing plays a supporting role, ensuring a good supporting effect. When adjusting or using for a long time, the worm 2 is not easy to loosen. The dual-lead reducer in this embodiment has better performance, better rigidity of the worm 2, good anti-loosening effect, stable structure, and good sealing effect.

[0035] Specifically, Figure 1 As shown, a sealing groove 4.1 is provided on the middle outer wall of the bearing seat 4, and the sealing member is located in the sealing groove 4.1. The sealing groove 4.1 is annular, and the sealing member can be an O-ring, which is arranged in the sealing groove 4.1. There are multiple sealing grooves 4.1, which further improves the sealing effect of the bearing seat 4.

[0036] Further, such as Figure 1 As shown, the left end of the worm 2 is provided with a second round nut 10 for limiting the first ball bearing 5 on the worm 2 and a stop washer 11 matched with the second round nut 10. The second round nut 10 and the stop washer 11 limit the first ball bearing 5 and the bearing cover on the limiting shoulder. When the worm 2 is axially moved and adjusted, the first ball bearing 5 and the bearing cover do not move with the worm 2. There are two second round nuts 10, and the two second round nuts 10 can apply a certain preload force to the first ball bearing 5, improve the rigidity of the worm 2, and have an anti-loosening effect.

[0037] In this embodiment, Figure 1 , Figure 2 As shown, the second ball bearing 6 is limited in position in the housing 1 by an elastic retaining ring 12. A limiting groove is provided on the inner wall of the housing 1, and the elastic retaining ring 12 is located in the limiting groove. The elastic retaining ring 12 limits the second ball bearing 6 in the housing 1. When the worm 2 is axially moved and adjusted, the second ball bearing 6 and the housing 1 do not move. A positioning shoulder is provided in the housing 1, and the second ball bearing 6 is limited on the positioning shoulder and then limited by the elastic retaining ring 12, so that the second ball bearing 6 is limited in the housing 1 and does not move axially. As shown Figure 1 , Figure 2As shown, the right end of the worm 2 is sleeved with a first double-lip skeleton oil seal 13, and the first double-lip skeleton oil seal 13 is located at the right end of the second ball bearing 6, and the elastic retaining ring 12 is located between the second ball bearing 6 and the first double-lip skeleton oil seal 13. The first double-lip skeleton oil seal 13 improves the sealing effect on the right side of the second ball bearing 6. Specifically, an oil seal cover 14 is provided at the right end of the housing 1, and the left end of the oil seal cover 14 is inserted into the right end opening of the housing 1, and the oil seal cover 14 is screwed to the right end of the housing 1. The oil seal cover 14 is used to limit the first double-lip skeleton oil seal 13 on the inner wall of the right end of the housing 1. Further, as Figure 1 As shown, a second double-lip skeleton oil seal 15 is provided on the inner wall of the oil seal cover 14, and the second double-lip skeleton oil seal 15 is sleeved on the worm 2. A limiting groove is provided on the inner wall of the oil seal cover 14, and a limiting block is provided on the outer wall of the second double-lip skeleton oil seal 15, and the limiting groove cooperates with the limiting block. The second double-lip skeleton oil seal 15 is limited on the oil seal cover 14 through the cooperation of the limiting block and the limiting groove, so as to further improve the sealing effect of the worm 2.

[0038] In this embodiment, Figure 1 , Figure 2 As shown, the worm 2 is a double-lead worm 2, a worm wheel 3 is provided in the housing 1, and the worm 2 is meshingly connected to the worm wheel 3. The worm 2 adopts a double-lead design, and the axial movement of the worm 2 can adjust the meshing side clearance of the worm wheel 3 and the worm 2, thereby improving the transmission accuracy.

[0039] In the double-lead reducer described in the above embodiment, the worm 2 adopts a double-lead design, and the worm 2 can adjust the meshing side clearance of the worm wheel 3 and the worm 2 by axial movement, thereby improving the transmission accuracy. In order to solve the support sealing problem caused by the axial movement of the worm 2, a bearing seat 4 is designed at the left end of the worm 2. The axial movement is adjusted by adjusting the bearing seat 4, and the first round nut 7 is locked. The first ball bearing 5 and the second ball bearing 6 inside will bear all the axial loads and part of the radial loads of the worm 2. The first round nut 7 and the bearing seat 4 are locked and matched, and have an anti-loosening effect. Compared with the prior art, the problem of unstable supporting performance and poor sealing effect between the bearing and the worm 2 and the housing 1 needs to be considered. The bearing seat 4 in this solution improves the supporting performance of the worm 2 while maintaining the sealing effect between the parts through the seal. The locking of the first round nut 7 and the thread locking between the bearing seat 4 and the housing 1 further improve the rigidity of the worm 2, and it is not easy to loosen after long-term use. The invention solves the problem that the supporting sealing effect of the existing double-lead reducer is poor, the worm 2 is easily loosened after long-term use, and the meshing accuracy of the worm wheel 3 and the worm 2 is reduced.

[0040] The basic structure is based on the structure of the second embodiment. The box body 1 is provided with a metal oil mark 16 and a plurality of hexagon socket taper thread oil plugs 17. The hexagon socket taper thread oil plugs 17 are used to connect the elbow pipe joints. The lubricating oil can be provided with external circulation cooling.

[0041] In summary, the utility model has the following beneficial effects: the worm 2 adopts a double-lead design, and the worm 2 can adjust the meshing side clearance of the worm wheel 3 and the worm 2 by axial movement, thereby improving the transmission accuracy; the bearing seat 4 improves the supporting performance of the worm 2 and improves the sealing effect between the parts through the seal; the second round nut 10 can apply a certain preload force to the first ball bearing 5, improve the rigidity of the worm 2, and has an anti-loosening effect; the housing 1 is provided with a plurality of elbow pipe joints, and the lubricating oil can be set to external circulation cooling. The problem of poor supporting sealing effect of the existing double-lead reducer, which easily causes the worm 2 to loosen after long-term use, and then leads to reduced meshing accuracy of the worm wheel 3 and the worm 2 is solved.

[0042] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-lead reducer, comprising a housing and a worm movably arranged on the housing, characterized in that: It also includes a bearing seat for axially adjusting the worm, the right end of the bearing seat is threadedly connected to the inner wall of the left end of the box, the left end of the worm is rotatably set on the bearing seat through a first ball bearing, and the right end is movably set on the inner wall of the right end of the box through a second ball bearing, a sealing member is provided between the bearing seat and the box, and a first round nut is sleeved on the left end of the bearing seat, which is threadedly connected to the bearing seat and abuts against the left end face of the box; the left end of the worm is provided with a second round nut for limiting the first ball bearing on the worm and a stop washer matching the second round nut.

2. A dual lead reducer according to claim 1, characterized in that: A sealing cover is provided at the left end of the bearing seat, and the left end of the worm is located inside the sealing cover.

3. A dual lead reducer according to claim 1, characterized in that: A sealing groove is provided on the middle outer wall of the bearing seat, and the sealing member is located in the sealing groove.

4. A dual lead reducer according to claim 1, 2 or 3, characterized in that: A bearing cover is provided on the right side of the first ball bearing, and the bearing cover is sleeved on the worm.

5. A dual lead reducer according to claim 1, 2 or 3, characterized in that: The second ball bearing is limited in the box body by an elastic retaining ring. A limiting groove is provided on the inner wall of the box body, and the elastic retaining ring is located in the limiting groove.

6. A dual lead reducer according to claim 5, characterized in that: The right end of the worm is sleeved with a first double-lip skeleton oil seal, the first double-lip skeleton oil seal is located at the right end of the second ball bearing, and the elastic retaining ring is located between the second ball bearing and the first double-lip skeleton oil seal.

7. A dual lead reducer according to claim 6, characterized in that: An oil seal cover is arranged at the right end of the box body, and the left end of the oil seal cover is inserted into the right end opening of the box body, and the oil seal cover is locked at the right end of the box body by screws.

8. A dual lead reducer according to claim 7, characterized in that: A second double-lip skeleton oil seal is provided on the inner wall of the oil seal cover, and the second double-lip skeleton oil seal is sleeved on the worm.

9. A dual lead reducer according to claim 1, 2 or 3, characterized in that: The worm is a double-lead worm, a worm wheel is arranged in the housing, and the worm is meshingly connected with the worm wheel.

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