阅读说明：本技术 一种蜗轮蜗杆减速机及蜗轮蜗杆升降机 (Worm gear speed reducer and worm gear lift ) 是由 黄仁聪 刘大健 梁健勇 于 2020-11-23 设计创作，主要内容包括：本发明公开了一种蜗轮蜗杆减速机及蜗轮蜗杆升降机,包括箱体、蜗杆、至少一对第一轴承、蜗轮、输出端盖、输出轴以及至少一对第二轴承,箱体开设有相连通的第一通孔以及第二通孔,第一通孔的中心线与第二通孔的中心线相垂直,蜗杆配置于第一通孔,一对第一轴承分别插设于蜗杆的两端并与第一通孔配合,蜗轮收容于第二通孔并与蜗杆啮合,输出端盖配置于箱体的出口端,输出端盖配置有第三通孔,第三通孔与第二通孔同轴并相连通,输出轴插接于蜗轮的中心孔,一对第二轴承中的其中一者插设于输出轴的第一端并与第二通孔配合,一对第二轴承中的另一者插设于输出轴的第二端并收容于第三通孔中。其能够提高承载能力以及延长使用寿命。(The invention discloses a worm gear speed reducer and a worm gear lifter, which comprise a box body, a worm and at least one pair of first bearings, the worm gear is accommodated in the second through hole and meshed with the worm, the output end cover is arranged at the outlet end of the box body, the third through hole is coaxial and communicated with the second through hole, the output shaft is inserted in a central hole of the worm gear, one of the second bearings is inserted in the first end of the output shaft and matched with the second through hole, and the other second bearing is inserted in the second end of the output shaft and accommodated in the third through hole. It can improve bearing capacity and increase of service life.)

1. A worm gear and worm speed reducer is characterized by comprising a box body, a worm, at least one pair of first bearings, a worm wheel, an output end cover, an output shaft and at least one pair of second bearings, wherein the box body is provided with a first through hole and a second through hole which are communicated, the center line of the first through hole is vertical to the center line of the second through hole, the worm is arranged in the first through hole, the pair of first bearings are respectively inserted at two ends of the worm and matched with the first through hole, the worm wheel is accommodated in the second through hole and meshed with the worm, the output end cover is arranged at the outlet end of the box body and provided with a third through hole, the third through hole is coaxial and communicated with the second through hole, the output shaft is inserted in a central hole of the worm wheel, one of the pair of second bearings is inserted at the first end of the output shaft and matched with the second through hole, the other one of the pair of second bearings is inserted into the second end of the output shaft and is accommodated in the third through hole.

2. The worm gear reducer of claim 1, wherein the first bearing and the second bearing are tapered roller bearings.

3. The worm gear reducer according to claim 1, wherein the worm wheel is made of an aluminum bronze alloy.

4. The worm gear reducer according to claim 1, wherein the third through hole includes a fourth through hole and a fifth through hole connected in sequence, the fourth through hole is close to the outlet end of the box body, the aperture of the fourth through hole is larger than that of the fifth through hole, a limit ring is disposed between the fourth through hole and the fifth through hole, a second bearing inserted in the second end of the output shaft is disposed in the fifth through hole, the aperture of the central hole of the limit ring is smaller than the inner diameter of the outer ring of the second bearing, the limit ring abuts against the outer ring of the second bearing, and the inner ring of the second bearing inserted in the second end of the output shaft abuts against the first shoulder of the second end of the output shaft.

5. The worm gear reducer according to claim 4, further comprising a spacer, wherein the spacer comprises a first annular portion and a second annular portion connected in sequence, an outer diameter of the first annular portion is smaller than an outer diameter of the second annular portion, the first annular portion is inserted into the second through hole, the third through hole further comprises a sixth through hole, the sixth through hole is disposed at an end of the fifth through hole away from the fourth through hole, an aperture of the sixth through hole is larger than an aperture of the fifth through hole, a step surface is formed between the fifth through hole and the sixth through hole, the second annular portion is disposed at the sixth through hole, one end of the second annular portion abuts against the step surface, and the other end of the second annular portion abuts against the box body.

6. The worm gear reducer according to claim 1, wherein an inner ring of the second bearing inserted into the first end of the output shaft abuts against a second shoulder of the first end of the output shaft, and an outer ring of the second bearing inserted into the first end of the output shaft abuts against a third shoulder of the second through hole; and/or a first oil seal is arranged between the first end of the output shaft and the second through hole.

7. The worm gear reducer as recited in claim 1, wherein an inlet end of the housing is configured with an input flange, and a second oil seal is configured between an inner bore of the input flange and the first end of the worm.

8. The worm gear reducer of claim 7 wherein an outer race of the first bearing at the first end of the worm abuts an inner wall of the flange and an inner race of the first bearing at the first end of the worm abuts a fourth shoulder of the first end of the worm.

9. The worm gear reducer according to claim 1, wherein the worm gear reducer further comprises an input end cover, the input end cover is fixed to the box body, a center line of the input end cover coincides with a center line of the worm, an outer ring of the first bearing located at the second end of the worm abuts against an inner wall of the input end cover, and an inner ring of the first bearing located at the second end of the worm abuts against a fifth shoulder of the first end of the worm.

10. A worm gear elevator, characterized by comprising the worm gear reducer of any one of claims 1-9 and a lead screw, the lead screw being in threaded connection with the output shaft.

Technical Field

The invention relates to the technical field of speed reducers, in particular to a worm gear speed reducer and a worm gear lifter.

Background

At present, a worm and gear elevator mainly adopts a worm and gear speed reducer for speed reduction transmission, a worm is used for driving a worm wheel to rotate, a lead screw is in threaded transmission with the worm to push the lead screw to move axially, and the worm and gear elevator has a lifting speed reduction function.

However, the existing worm gear speed reducer still has the following defects: the worm gear speed reducer is easy to cause noise or reduce the service life due to overlarge load.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a worm gear speed reducer and a worm gear lifter which have higher bearing capacity and longer service life.

The purpose of the invention is realized by adopting the following technical scheme:

a worm gear and worm speed reducer comprises a box body, a worm, at least one pair of first bearings, a worm wheel, an output end cover, an output shaft and at least one pair of second bearings, wherein the box body is provided with a first through hole and a second through hole which are communicated, the center line of the first through hole is vertical to the center line of the second through hole, the worm is arranged in the first through hole, the pair of first bearings are respectively inserted at two ends of the worm and matched with the first through hole, the worm wheel is accommodated in the second through hole and meshed with the worm, the output end cover is arranged at the outlet end of the box body and provided with a third through hole, the third through hole is coaxial with and communicated with the second through hole, the output shaft is inserted in a central hole of the worm wheel, one of the pair of second bearings is inserted at the first end of the output shaft and matched with the second through hole, the other one of the pair of second bearings is inserted into the second end of the output shaft and is accommodated in the third through hole.

Further, the first bearing and the second bearing are both tapered roller bearings.

Further, the worm wheel is made of an aluminum bronze alloy material.

Furthermore, the third through hole comprises a fourth through hole and a fifth through hole which are sequentially connected, the fourth through hole is close to the outlet end of the box body, the aperture of the fourth through hole is larger than that of the fifth through hole, a limiting ring is configured between the fourth through hole and the fifth through hole, a second bearing inserted at the second end of the output shaft is configured in the fifth through hole, the aperture of the central hole of the limiting ring is smaller than the inner diameter of the outer ring of the second bearing, the limiting ring abuts against the outer ring of the second bearing, and the inner ring of the second bearing inserted at the second end of the output shaft abuts against the first shoulder of the second end of the output shaft.

Furthermore, the worm gear speed reducer also comprises a spacer bush, the spacer bush comprises a first annular part and a second annular part which are connected in sequence, the outer diameter of the first annular part is smaller than that of the second annular part, the first annular part is inserted in the second through hole, the third through hole also comprises a sixth through hole, the sixth through hole is arranged at one end, away from the fourth through hole, of the fifth through hole, the aperture of the sixth through hole is larger than that of the fifth through hole, a step surface is formed between the fifth through hole and the sixth through hole, the second annular part is arranged in the sixth through hole, one end of the second annular part abuts against the step surface, and the other end of the second annular part abuts against the box body.

Furthermore, an inner ring of a second bearing inserted at the first end of the output shaft abuts against a second shoulder position of the first end of the output shaft, and an outer ring of the second bearing inserted at the first end of the output shaft abuts against a third shoulder position in the second through hole; and/or a first oil seal is arranged between the first end of the output shaft and the second through hole.

Further, the inlet end of the box body is provided with an input flange, and a second oil seal is arranged between an inner hole of the input flange and the first end of the worm.

Furthermore, the outer ring of the first bearing at the first end of the worm abuts against the inner wall of the flange, and the inner ring of the first bearing at the first end of the worm abuts against the fourth shaft shoulder at the first end of the worm.

Furthermore, the worm and gear reduction box further comprises an input end cover, the input end cover is fixed with the box body, the center line of the input end cover is overlapped with the center line of the worm, the outer ring of the first bearing positioned at the second end of the worm is abutted against the inner wall of the input end cover, and the inner ring of the first bearing positioned at the second end of the worm is abutted against the fifth shaft shoulder position of the first end of the worm.

A worm gear lift comprises the worm gear speed reducer and a lead screw, wherein the lead screw is in threaded connection with an output shaft.

Compared with the prior art, the invention has the beneficial effects that:

one of the pair of second bearings is arranged in the output end cover, so that the span between the pair of second bearings can be increased on the premise of not increasing the height size of the box body, namely, the span of the worm gear bearing position is increased, the bearing capacity of the worm gear is increased while the overall structure of the worm gear speed reducer is compact, and the noise or the shortened service life caused by the overlarge load can be effectively avoided.

Drawings

FIG. 1 is a schematic structural diagram of a worm gear reducer of the present invention;

FIG. 2 is an exploded view of the worm gear reducer of FIG. 1;

FIG. 3 is a partial cross-sectional view of the worm gear reducer shown in FIG. 1;

FIG. 4 is a partial cross-sectional view of the worm gear reducer shown in FIG. 1;

FIG. 5 is a schematic structural diagram of an output end cover in the worm gear reducer shown in FIG. 2;

fig. 6 is a schematic structural view of a spacer in the worm gear reducer shown in fig. 2.

In the figure: 1. a box body; 11. a first through hole; 12. a second through hole; 2. a worm; 21. connecting holes; 3. a first bearing; 4. an input flange; 5. a second oil seal; 6. an input end cap; 7. a worm gear; 8. an output shaft; 9. a second bearing; 10. an output end cover; 101. a fourth via hole; 102. a fifth through hole; 103. a limiting ring; 104. a sixth through hole; 110. a spacer sleeve; 1101. a first annular portion; 1102. a second annular portion; 120. a first oil seal.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

Referring to fig. 1 to 4, a worm gear reducer according to a preferred embodiment of the present invention is shown, which includes a case 1, a worm 2, at least one pair of first bearings 3, a worm wheel 7, an output shaft 8, at least one pair of second bearings 9, and an output end cap 10, wherein the case 1 is provided with a first through hole 11 and a second through hole 12 which are communicated with each other, a center line of the first through hole 11 is perpendicular to a center line of the second through hole 12, the worm 2 is disposed in the first through hole 11, the pair of first bearings 3 are respectively inserted into two ends of the worm 2 and are matched with the first through hole 11, the worm wheel 7 is accommodated in the second through hole 12 and is meshed with the worm 2, the output end cap 10 is disposed at an outlet end of the case 1, the output end cap 10 is provided with a third through hole which is coaxial with and communicated with the second through hole 12, the output shaft 8 is disposed in, one of the pair of second bearings 9 is inserted into the first end of the output shaft 8 and is engaged with the second through hole 12, and the other of the pair of second bearings 9 is inserted into the second end of the output shaft 8 and is received in the third through hole.

One of the pair of second bearings 9 is disposed in the output end cover 10, so that the span between the pair of second bearings 9, that is, the bearing position span of the worm wheel 7, can be increased on the premise of not increasing the height dimension of the box body 1, the bearing capacity of the worm wheel 7 is increased while the overall structure of the worm and gear speed reducer is ensured to be compact, and noise or shortened service life caused by excessive load can be effectively avoided.

In a preferred embodiment, the box 1 is made of HT250 (ductile cast steel) or QT450 (ductile cast iron) material, and finite element analysis is performed before machining to ensure good rigidity, high strength, compact mechanical structure, good heat dissipation, and long service life of the box 1.

As a preferred embodiment, the worm 2 is made of 20CrMnTi (carburizing steel), the integral carbonitriding is realized through heat treatment, the accuracy can reach 6 grades after the thread of the worm 2 is ground, and the tooth width of the worm 2 is specially widened during design, so that a sufficient margin is ensured during axial adjustment.

In order to conveniently connect the driving source, the first end of the worm 2 preferably extends out of the inlet end of the box body 1, the first end of the worm 2 is provided with a connecting hole 21, the hole wall of the connecting hole 21 is provided with a key groove, and the output end of the driving source is matched with the connecting hole 21 and realizes stable and reliable transmission through key connection.

As a preferred embodiment, the worm wheel 7 is preferably made of a material with high wear resistance, such as KK alloy copper (aluminum bronze alloy), so that the worm wheel 7 can maintain a good meshing gap during long-term operation, and the worm gear reducer is more stable during operation; secondly, the worm wheel 7 made of KK alloy copper has high tensile strength, so that the bending strength of the gear teeth of the worm wheel 7 cannot be weakened, and the transmission efficiency, the service life and the bearing capacity of the worm wheel 7 are greatly improved; the worm wheel 7 is integrally cast with the iron core when copper is cast, so that the manufacturing cost can be greatly reduced; in addition, after the gear teeth of the worm wheel 7 are ground, the precision can reach 6 levels, and the mechanical strength is better; in addition, when the worm wheel 7 is hobbed, a numerical control hobber on a hydraulic mandrel is adopted for processing, a large plane and an inner hole are used for positioning, the radial runout tolerance of a worm wheel 7 gear ring is controlled within 0.02mm, hobbing and chamfering are synchronous during hobbing, the phenomenon that burrs are turned inwards after hobbing is avoided, the quality is improved, and the noise is reduced.

As a preferred embodiment, the first bearing 3 and the second bearing 9 are both tapered roller bearings, so that the worm gear speed reducer can bear a large axial load and a large radial load, the bearing capacity is improved, and the service life is longer.

Referring to fig. 3, as a preferred embodiment, an input flange 4 is disposed at an inlet end of the casing 1, specifically, the input flange 4 is fixed to the casing 1 by screws, and the input flange 4 is disposed such that the worm gear reducer can be selectively provided with drive sources such as motors and gear reducers of different types according to different rotation speeds, or can be connected to a plurality of drive sources according to use requirements, or can be directly input to a shaft to be manually driven. A second oil seal 5 is arranged between the inner bore of the input flange 4 and the first end of the worm 2.

With continued reference to fig. 3, the outer ring of the first bearing 3 at the first end of the worm 2 abuts against the inner wall of the flange, and the inner ring of the first bearing 3 at the first end of the worm 2 abuts against the fourth shoulder of the first end of the worm 2, so as to limit the first bearing 3 at the first end of the worm 2 in the axial direction, avoid axial movement thereof, and improve the transmission stability of the worm 2.

With continued reference to fig. 3, the worm wheel 7 and worm 2 reduction box further comprises an input end cover 6, the input end cover 6 is fixed with the box body 1, the center line of the input end cover 6 is overlapped with the center line of the worm 2, the outer ring of the first bearing 3 located at the second end of the worm 2 abuts against the inner wall of the input end cover 6, the inner ring of the first bearing 3 located at the second end of the worm 2 abuts against the fifth shoulder of the first end of the worm 2, so that the first bearing 3 located at the second end of the worm 2 is limited in the axial direction, axial movement of the first bearing 3 is avoided, and transmission stability of the worm 2 is improved.

Referring to fig. 5, as a preferred embodiment, the third through hole includes a fourth through hole 101 and a fifth through hole 102 which are connected in sequence and are coaxial, the fourth through hole 101 is close to the outlet end of the housing 1, the aperture of the fourth through hole 101 is larger than the aperture of the fifth through hole 102, a position-limiting ring 103 is disposed between the fourth through hole 101 and the fifth through hole 102, the second bearing 9 inserted in the second end of the output shaft 8 is disposed in the fifth through hole 102, the aperture of the central hole of the position-limiting ring 103 is smaller than the inner diameter of the outer ring of the second bearing 9, so as to ensure that the position-limiting ring 103 is not in contact with the inner ring of the second bearing 9, and prevent the position-limiting ring 103 from abutting against the inner ring of the second bearing 9 to obstruct the rotation of the inner ring of the second bearing 9, referring to fig. 4, the position-limiting ring 103 abuts against the outer ring of the second bearing 9 located in the fifth through hole 102, the inner ring of the second bearing 9 inserted in the, the second bearing 9 inserted at the second end of the output shaft 8 is axially limited, and axial movement of the second bearing is avoided, so that the transmission stability of the worm wheel 7 is improved.

Referring to fig. 4 and 6, as a preferred embodiment, the worm gear reducer further includes a spacer 110, the spacer 110 includes a first annular portion 1101 and a second annular portion 1102 connected in sequence, an outer diameter of the first annular portion 1101 is smaller than an outer diameter of the second annular portion 1102, the first annular portion 1101 is inserted into the second through hole 12, the third through hole further includes a sixth through hole 104, the sixth through hole 104 is disposed at an end of the fifth through hole 102 away from the fourth through hole 101, an aperture of the sixth through hole 104 is larger than an aperture of the fifth through hole 102, a step surface is formed between the fifth through hole 102 and the sixth through hole 104, the second annular portion 1102 is disposed at the sixth through hole 104, one end of the second annular portion 1102 abuts against the step surface, and the other end of the second annular portion 1102 abuts against the case 1, so that the spacer 110 can function as an oil seal without increasing a height dimension of the case 1, and oil of the case 1 is prevented from leaking from a gap between the case 1 and the output end cap 10 to the outside, at the same time it can also serve to limit the second bearing 9 at the second end of the output shaft 8.

With continued reference to fig. 4, as a preferred embodiment, the inner ring of the second bearing 9 inserted into the first end of the output shaft 8 abuts against the second shoulder of the first end of the output shaft 8, and the outer ring of the second bearing 9 inserted into the first end of the output shaft 8 abuts against the third shoulder in the second through hole 12, so as to axially limit the second bearing 9 inserted into the first end of the output shaft 8, and avoid axial movement thereof, thereby improving the transmission stability of the worm wheel 7.

In a preferred embodiment, a first oil seal 120 is disposed between the first end of the output shaft 8 and the second through hole 12.

In a preferred embodiment, the output shaft 8 and the worm wheel 7 are independent structures, and are connected separately, the second end of the output end preferably extends out of the output end cover 10, and the output shaft 8 is hollow so as to be conveniently connected with a working machine (not shown in the figure).

The invention also discloses a worm wheel 7 and worm 2 lifter, which comprises the worm wheel and worm speed reducer and a lead screw, wherein the lead screw is in threaded connection with the output shaft 8, the thread of the output shaft 8 is processed by adopting a special screw tap or a special tool, so that the fit clearance between the output shaft 8 and the lead screw is uniform, the working machine can be stably operated, the working table is prevented from shaking when the working machine stops, the worm 2 is used for driving the worm wheel 7, and the worm wheel 7 drives the output shaft 8 to rotate, so that the lead screw is driven to axially move, and the lifting is realized.

The worm gear speed reducer can be applied to speed reduction transmission of mechanical equipment in various industries such as metallurgy, mining, hoisting, chemical engineering, building and the like, and can also be applied to speed reduction mechanisms of mechanical equipment such as ceramics, glass, woodwork, food, packaging, welding, high-voltage switches and the like.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.