Slewing bearing for speed reducer
By designing the double row rolling elements and sealing structure in the reducer slewing support, the problems of low safety factor and insufficient sealing performance in the prior art are solved, and a higher load bearing capacity and service life are extended.
Patent Information
- Application Number
- CN202420903808.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The existing reducer slewing bearings have low safety factors when they bear large working loads and overturning torques, and insufficient sealing performance, resulting in insufficient service life.
A reducer rotary support with double rows of rolling elements is designed. The axial direction is improved by setting up an upper channel and a lower channel between the outer ring and the inner ring, and a sealing groove and a sealing ring between the outer ring and the inner ring. Radial load and overturning moment with bearing capacity and sealing properties.
It achieves a higher safety factor and service life, can withstand large axial and radial loads and overturning moments at the same time, and effectively avoids the entry of external dirt, extending the service life of the reducer's slewing support.
Smart Images
Figure CN222296727U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering machinery, in particular to a slewing bearing for a reducer. Background Art
[0002] A reducer is an independent component consisting of a gear drive, worm drive, or 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.
[0003] The main technical problems of existing reducer slewing bearings are: (1) they usually have only a single row of rolling elements, which makes it impossible to withstand large working loads and overturning moments at the same time, and the safety factor is low; (2) it is difficult to withstand large axial and radial loads; (3) the sealing performance is low, and external dirt can easily enter the reducer slewing bearing, causing blockage inside the slewing bearing, resulting in a short service life of the reducer slewing bearing. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a slewing bearing for a reducer with double rows of rolling elements, which can simultaneously withstand large axial and radial loads and overturning moments, has a high safety factor, high sealing performance and long service life, in view of the deficiencies in the above-mentioned prior art.
[0005] In order to solve the above technical problems, the technical solution of the utility model is: a slewing bearing for a reducer, comprising an outer ring, an inner ring, an upper rolling body and a lower rolling body, the outer ring is axially provided with a placement groove, the inner ring is placed in the placement groove, the inner ring comprises an upper inner ring and a lower inner ring, the inner side of the outer ring is provided with an inner protrusion, the intersection of the upper side of the inner protrusion and the inner side of the upper end of the outer ring is provided with an outer ring upper groove, the upper end of the upper inner ring is provided with a first outer protrusion, the lower side of the first outer protrusion and the intersection of the lower end of the upper inner ring are provided with an inner ring An upper groove, an upper channel is formed between the outer ring upper groove and the inner ring upper groove, the upper rolling body is arranged in the upper channel, an outer ring lower groove is arranged at the intersection of the lower side of the inner protrusion and the outer side of the lower end of the outer ring, a second outer protrusion is arranged at the lower end surface of the lower inner ring, an inner ring lower groove is arranged at the intersection of the upper side of the second outer protrusion and the outer side of the upper end of the lower inner ring, a lower channel is formed between the outer ring lower groove and the inner ring lower groove, the lower rolling body is arranged in the lower channel, and the upper channel and the lower channel are arranged at intervals.
[0006] As a preferred embodiment, the slewing bearing for the reducer also includes an upper sealing ring and a lower sealing ring, the outer ring is provided with an upper sealing groove, the upper sealing ring is installed in the upper sealing groove, the upper sealing ring is abutted against the outer wall of the inner ring, the inner side of the outer ring is provided with a lower sealing groove, the lower sealing ring is installed in the lower sealing groove, and the lower sealing ring is abutted against the lower end face of the inner ring.
[0007] As a preferred solution, the lower inner ring is provided with fastening screw holes at intervals along its circumference, and the upper inner ring is provided with fastening holes, the fastening holes are arranged in one-to-one correspondence with the fastening screw holes, bolts pass through the fastening holes and cooperate with the fastening screw holes, the upper inner ring is fixedly connected to the lower inner ring, and the angle between two adjacent fastening screw holes is 60°.
[0008] As a preferred solution, the diameter of the upper rolling body is greater than the diameter of the lower rolling body.
[0009] As a preferred solution, the outer side of the outer ring is provided with mounting teeth for assembly with a reducer.
[0010] As a preferred solution, the outer ring is evenly provided with outer ring mounting holes along the circumference, and the angle between two adjacent outer ring mounting holes is 10°; the inner ring is evenly provided with inner ring mounting holes along the circumference, and the angle between two adjacent inner ring mounting holes is 10°.
[0011] As a preferred solution, upper oil holes are evenly arranged on the inner side of the upper inner ring along its circumference, the upper oil holes are connected to the upper channel, and the angle between two adjacent upper oil holes is 120°. Lower oil holes are evenly arranged on the inner side of the lower inner ring along its circumference, the lower oil holes are connected to the lower channel, and the angle between two adjacent lower oil holes is 120°. The upper oil holes and the lower oil holes are staggered.
[0012] As a preferred solution, the outer ring is provided with an outer ring hoisting hole.
[0013] As a preferred solution, the upper inner ring is provided with an upper hanging hole, and the lower inner ring is provided with a lower hanging hole, the upper hanging hole and the lower hanging hole are provided correspondingly, and the opening directions of the upper hanging hole and the lower hanging hole are opposite.
[0014] As a preferred solution, the outer ring hoisting hole and the lower hoisting hole have the same opening direction.
[0015] The beneficial effects of the utility model are as follows: the utility model has an inner protrusion on the inner side of the outer ring, an outer ring upper groove is arranged at the intersection of the upper side of the inner protrusion and the inner side of the upper end of the outer ring, a first outer protrusion is arranged at the upper end of the upper inner ring, an inner ring upper groove is arranged at the intersection of the lower side of the first outer protrusion and the outer side of the lower end of the upper inner ring, an upper channel is formed between the outer ring upper groove and the inner ring upper groove, an upper rolling body is arranged in the upper channel, an outer ring lower groove is arranged at the intersection of the lower side of the inner protrusion and the outer side of the lower end of the outer ring, a second outer protrusion is arranged on the lower end surface of the lower inner ring, an inner ring lower groove is arranged at the intersection of the upper side of the second outer protrusion and the outer side of the upper end of the lower inner ring, a lower channel is formed between the outer ring lower groove and the inner ring lower groove, and the lower rolling body is arranged in the In the lower channel, the upper channel and the lower channel are arranged at intervals, the upper rolling body is arranged in the upper channel, and the lower rolling body is arranged in the lower channel. Such a structural arrangement enables the reducer slewing bearing to simultaneously withstand larger axial and radial loads and overturning moments, and has a higher safety factor; the outer ring is provided with an upper sealing groove, the upper sealing ring is installed in the upper sealing groove, the upper sealing ring is abutted against the outer wall of the inner ring, and the inner side of the outer ring is provided with a lower sealing groove, the lower sealing ring is installed in the lower sealing groove, and the lower sealing ring is abutted against the lower end face of the inner ring, so that the sealing performance is effectively improved, and the phenomenon of internal blockage of the slewing bearing caused by external dirt entering the interior of the reducer slewing bearing is effectively avoided, thereby extending the service life of the reducer slewing bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a front view of a slewing bearing for a reducer in one embodiment of the utility model;
[0017] Figure 2 for Figure 1 Cross-sectional view of the AA section;
[0018] Figure 3 for Figure 1 Cross-sectional view of the middle BB part;
[0019] Figure 4 for Figure 1 Cross-sectional view of the CC section;
[0020] Figure 5 for Figure 1 Cross-sectional view of the DD part.
[0021] In the figure:
[0022] 100-slewing bearing for reducer;
[0023] 10-outer ring, 11-outer ring upper groove, 12-outer ring lower groove, 13-mounting teeth, 14-outer ring mounting hole, 15-outer ring lifting hole, 16-inner protrusion;
[0024] 20-inner ring, 21-upper inner ring, 211-first outer protrusion, 22-lower inner ring, 221-second outer protrusion, 23-upper groove of inner ring, 24-lower groove of inner ring, 25-fastening screw hole, 26-fastening hole, 27-inner ring mounting hole, 28-upper hanging hole, 29-lower hanging hole;
[0025] 30-upper rolling element;
[0026] 40-lower rolling element;
[0027] 50-upper sealing ring;
[0028] 60-lower sealing ring;
[0029] 70- Grease nozzle;
[0030] 80-Lower oil nozzle. DETAILED DESCRIPTION
[0031] The structural principle and working principle of the utility model are further described in detail below with reference to the accompanying drawings.
[0032] Combination Figure 1 and Figure 2 As shown, a slewing bearing 100 for a reducer comprises an outer ring 10, an inner ring 20, an upper rolling body 30 and a lower rolling body 40. The outer ring 10 is axially provided with a placement groove, the inner ring 20 is placed in the placement groove, the inner ring 20 comprises an upper inner ring 21 and a lower inner ring 22, an inner side of the outer ring 10 is provided with an inner protrusion 16, an outer ring upper groove 11 is provided at the intersection of the upper side of the inner protrusion 16 and the inner side of the upper end of the outer ring 10, a first outer protrusion 211 is provided at the upper end of the upper inner ring 21, an inner ring upper groove 23 is provided at the intersection of the lower side of the first outer protrusion 211 and the outer side of the lower end of the upper inner ring 21, an upper channel is formed between the outer ring upper groove 11 and the inner ring upper groove 23, and the upper rolling body 30 is provided on the upper In the channel, an outer ring lower groove is provided at the intersection of the lower side of the inner protrusion 16 and the outer side of the lower end of the outer ring 10, a second outer protrusion 221 is provided on the lower end face of the lower inner ring 22, an inner ring lower groove 24 is provided at the intersection of the upper side of the second outer protrusion 221 and the outer side of the upper end of the lower inner ring 22, a lower channel is formed between the outer ring lower groove 12 and the inner ring lower groove 24, the lower rolling body 40 is arranged in the lower channel, the upper channel and the lower channel are spaced apart, the diameter of the upper rolling body 30 is larger than the diameter of the lower rolling body 40, the diameter of the upper rolling body 30 is 30 mm, and the diameter of the lower rolling body 40 is 25 mm, so that it can withstand larger axial loads, radial loads and overturning moments at the same time, and the safety factor is higher.
[0033] Combination Figure 1 and Figure 2 As shown, the reducer slewing bearing 100 also includes an upper sealing ring 50 and a lower sealing ring 60. The outer ring 10 is provided with an upper sealing groove, and the upper sealing ring 50 is installed in the upper sealing groove. The upper sealing ring 50 abuts against the outer wall of the inner ring 20. The inner side of the outer ring 10 is provided with a lower sealing groove, and the lower sealing ring 60 is installed in the lower sealing groove. The lower sealing ring 60 abuts against the lower end surface of the inner ring 20. This effectively improves the sealing performance and effectively avoids the phenomenon of internal blockage of the slewing bearing 100 due to external dirt entering the interior of the reducer, thereby extending the service life of the slewing bearing 100 for the reducer.
[0034] As a preferred solution, the upper sealing ring 50 and the lower sealing ring 60 are both sealing strips of model WT19A, which have stronger sealing performance.
[0035] like Figure 3 As shown, the lower inner ring 22 is provided with fastening screw holes 25 at intervals along its circumference, and the upper inner ring 21 is provided with fastening holes 26, and the fastening holes 26 are arranged one-to-one with the fastening screw holes 25. Bolts pass through the fastening holes 26 and cooperate with the fastening screw holes 25. The upper inner ring 21 is fixedly connected to the lower inner ring 22, and the angle between two adjacent fastening screw holes 25 is 60°.
[0036] Combination Figure 1 and Figure 3 As shown, the outer side of the outer ring 10 is provided with mounting teeth 13 for assembly with the reducer. The mounting teeth 13 can make the outer ring 10 and the reducer be assembled more tightly.
[0037] Combination Figure 1 and Figure 3 As shown, the outer ring 10 is evenly provided with outer ring mounting holes 14 in the circumferential direction, and the angle between two adjacent outer ring mounting holes 14 is 10°; the inner ring 20 is evenly provided with inner ring mounting holes 27 in the circumferential direction, and the angle between two adjacent inner ring mounting holes 27 is 10°.
[0038] like Figure 4 As shown, upper oil holes are evenly arranged on the inner side of the upper inner ring 21 along its circumference, the upper oil holes are connected to the upper channel, the angle between two adjacent upper oil holes is 120°, and each upper oil hole is provided with an upper oil nozzle 70. Lower oil holes are evenly arranged on the inner side of the lower inner ring 22 along its circumference, the lower oil holes are connected to the lower channel, the angle between two adjacent lower oil holes is 120°, and each lower oil hole is provided with a lower oil nozzle 80. The upper oil holes and the lower oil holes are staggered.
[0039] like Figure 5As shown, the outer ring 10 is provided with an outer ring hanging hole 15; the upper inner ring 21 is provided with an upper hanging hole 28, and the lower inner ring 22 is provided with a lower hanging hole 29, the upper hanging hole 28 and the lower hanging hole 29 are arranged correspondingly, and the opening directions of the upper hanging hole 28 and the lower hanging hole 29 are opposite; the outer ring hanging hole 15 and the lower hanging hole 29 have the same opening direction.
[0040] As a preferred solution, the outer ring 10, the upper inner ring 21 and the lower inner ring 22 are all made of 42CrMo, and the hardness of the outer ring 10, the upper inner ring 21 and the lower inner ring 22 is 240-280HB, which effectively improves the mechanical strength of the slewing bearing 100 for the reducer, effectively improves the bearing capacity of the slewing bearing 100 for the reducer, and effectively extends the service life of the slewing bearing 100 for the reducer; at the same time, it can effectively improve the corrosion resistance of the slewing bearing 100 for the reducer, so as to facilitate user maintenance.
[0041] As a preferred solution, the axial clearance between the outer ring 10 and the inner ring 20 is 0.06-0.20 mm, and the radial clearance between the outer ring 10 and the inner ring 20 is 0.06-0.35 mm. In this way, the slewing bearing 100 for the reducer rotates more lightly and flexibly.
[0042] The beneficial effects of the utility model are as follows: the upper channel and the lower channel are arranged at intervals, the upper rolling body 30 is rollingly arranged in the upper channel, and the lower rolling body 40 is rollingly arranged in the lower channel. Such a structural arrangement enables the reducer slewing bearing 100 to simultaneously withstand larger axial loads, radial loads and overturning moments, and has a higher safety factor; the outer ring 10 is provided with an upper sealing groove, the upper sealing ring 50 is installed in the upper sealing groove, and the upper sealing ring 50 is abutted against the outer wall of the inner ring 20, and the inner side of the outer ring 10 is provided with a lower sealing groove, the lower sealing ring 60 is installed in the lower sealing groove, and the lower sealing ring 60 is abutted against the lower end surface of the inner ring 20, so that the sealing performance is effectively improved, and the phenomenon of blockage inside the slewing bearing 100 for the reducer caused by external dirt entering the interior of the slewing bearing 100 for the reducer is effectively avoided, thereby extending the service life of the slewing bearing 100 for the reducer.
[0043] The above is only a preferred embodiment of the present invention. Any slight modification, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention are within the scope of the technical solution of the present invention.
Claims
1. A slewing bearing for a reducer, characterized in that: The invention comprises an outer ring, an inner ring, an upper rolling body and a lower rolling body, wherein the outer ring is axially provided with a placement groove, the inner ring is placed in the placement groove, the inner ring comprises an upper inner ring and a lower inner ring, an inner protrusion is provided on the inner side of the outer ring, an outer ring upper groove is provided at the intersection of the upper side of the inner protrusion and the inner side of the upper end of the outer ring, a first outer protrusion is provided at the upper end of the upper inner ring, an inner ring upper groove is provided at the intersection of the lower side of the first outer protrusion and the outer side of the lower end of the upper inner ring, and the outer ring upper groove and the inner ring are connected. An upper channel is formed between the upper grooves, the upper rolling body is arranged in the upper channel, an outer ring lower groove is arranged at the intersection of the lower side of the inner protrusion and the outer side of the lower end of the outer ring, a second outer protrusion is arranged at the lower end face of the lower inner ring, an inner ring lower groove is arranged at the intersection of the upper side of the second outer protrusion and the outer side of the upper end of the lower inner ring, a lower channel is formed between the outer ring lower groove and the inner ring lower groove, the lower rolling body is arranged in the lower channel, and the upper channel and the lower channel are arranged at intervals.
2. The slewing bearing for a speed reducer according to claim 1, characterized in that: It also includes an upper sealing ring and a lower sealing ring, the outer ring is provided with an upper sealing groove, the upper sealing ring is installed in the upper sealing groove, the upper sealing ring is abutted against the outer wall of the inner ring, the inner side of the outer ring is provided with a lower sealing groove, the lower sealing ring is installed in the lower sealing groove, and the lower sealing ring is abutted against the lower end surface of the inner ring.
3. The slewing bearing for a speed reducer according to claim 1, characterized in that: The lower inner ring is provided with fastening screw holes at intervals along its circumference, and the upper inner ring is provided with fastening holes, the fastening holes are arranged in one-to-one correspondence with the fastening screw holes, bolts pass through the fastening holes and cooperate with the fastening screw holes, the upper inner ring is fixedly connected to the lower inner ring, and the angle between two adjacent fastening screw holes is 60°.
4. The slewing bearing for a speed reducer according to claim 1, characterized in that: The diameter of the upper rolling body is greater than the diameter of the lower rolling body.
5. The slewing bearing for a speed reducer according to claim 1, characterized in that: The outer side of the outer ring is provided with mounting teeth for assembling with a reducer.
6. The slewing bearing for a speed reducer according to claim 1, characterized in that: The outer ring is evenly provided with outer ring mounting holes along the circumference, and the angle between two adjacent outer ring mounting holes is 10°; the inner ring is evenly provided with inner ring mounting holes along the circumference, and the angle between two adjacent inner ring mounting holes is 10°.
7. The slewing bearing for a speed reducer according to claim 1, characterized in that: The inner side of the upper inner ring is evenly provided with upper oil holes along its circumference, the upper oil holes are connected with the upper channel, and the angle between two adjacent upper oil holes is 120°. The inner side of the lower inner ring is evenly provided with lower oil holes along its circumference, the lower oil holes are connected with the lower channel, and the angle between two adjacent lower oil holes is 120°. The upper oil holes and the lower oil holes are staggered.
8. The slewing bearing for a speed reducer according to claim 1, characterized in that: The outer ring is provided with an outer ring hoisting hole.
9. The slewing bearing for a speed reducer according to claim 8, characterized in that: The upper inner ring is provided with an upper hanging hole, and the lower inner ring is provided with a lower hanging hole. The upper hanging hole and the lower hanging hole are arranged correspondingly, and the opening directions of the upper hanging hole and the lower hanging hole are opposite.
10. The slewing bearing for a speed reducer according to claim 9, characterized in that: The outer ring hoisting hole and the lower hoisting hole have the same opening direction.