Worm and gear speed reducer

Abstract

A worm wheel and a worm are contained in the worm wheel and worm speed reducer, the worm wheel is supported by a bidirectional stress bearing, the worm wheel and the worm are always kept in contact through an elastic device, and a rotating dial is arranged on a rotating-out rotating disc. According to the invention, large radial force and axial force can be borne, the worm gear and the worm are in gapless transmission, the dial on the roll-out turntable can perform zero-setting operation, and the device is widely applied to machine tools and automatic high-precision rotation occasions.

Description

Technical Field

[0001] The invention relates to the field of reducers, in particular to a worm gear reducer. Background Art

[0002] The single-stage reduction ratio of worm gear reducers can be very large, the transmission chain is short, the precision is high, and they are widely used in machine tools and automation fields. At present, some small worm gear reducers on the market generally have the following problems: first, the worm wheel is supported by a deep groove ball bearing, which can only withstand radial force but not large axial force; second, the position of the worm wheel and the worm is fixed, and there is a gap in the transmission; third, there is no scale mark on the output turntable or only a fixed scale mark, and it cannot be operated at zero. Summary of the invention

[0003] The invention provides a worm gear reducer, which uses a bidirectional force bearing to support the worm wheel; uses an elastic device to keep the worm wheel and the worm in contact all the time, and uses a rotatable dial to replace the traditional fixed dial, so as to solve the problems existing in the existing worm gear reducer.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a worm gear reducer, which contains a worm wheel and a worm, a first nut fixes the outer ring of a two-way force bearing to the inner cavity of the worm wheel, a second nut fixes the inner ring of the two-way force bearing to the support shaft, a first screw fixes the support shaft to the bottom of the inner cavity of the base, the upper part of the worm wheel is connected to an output turntable, a first sealing ring is provided between the outer diameter of the worm wheel and the inner cavity of the base, and a second sealing ring is provided between the upper inner cavity of the worm wheel and the second nut; a third nut fixes the active end of the worm to the inner ring of the second bearing, a fourth nut fixes the outer ring of the second bearing to the inner cavity of the active bearing seat, and the shaft is fixed with a retaining spring The driven end of the worm is fixed on the inner ring of the third bearing, and the outer ring of the third bearing is fixed to the inner cavity of the driven bearing seat by a retaining ring. The driven bearing seat has a protruding ear, and the ear has a through hole. The guide column is fixed to the base through the through hole, and the spring and the gasket are fitted on the guide column. The clamping nut presses the spring and the gasket on the surface of the ear through threads; the active end of the worm is connected with an elastic coupling, and the outside of the elastic coupling has a motor connecting seat, which is fixed to one side of the base; there is a third sealing ring between the active end of the worm and the base, and there are end covers and plugs on both sides of the base, and there is an end face sealing ring between the support shaft and the base.

[0005] The above-mentioned worm gear reducer, the active bearing seat has first pin holes on its upper and lower surfaces, and a second pin hole on the corresponding base, and a rotating pin is built into the pin hole.

[0006] The above-mentioned worm gear reducer has an output rotary disc with two outer diameters, a scale ring is arranged on the smaller outer diameter close to the base, the scale ring is connected to the output rotary disc by a set screw, and an indicator needle is fixed on the base.

[0007] In the above-mentioned worm gear reducer, the output turntable base is provided with a groove, the induction sheet is fixed in the groove by screws, and a photoelectric switch is fixed on the base.

[0008] In the above-mentioned worm gear reducer, the bidirectional load-bearing bearings at least include crossed roller bearings, double-row angular contact ball bearings and angular contact ball bearings installed in pairs.

[0009] In the above-mentioned worm gear reducer, the second bearing comprises at least a double-row angular contact ball bearing and a paired angular contact ball bearing.

[0010] The beneficial effects of the present invention are that a two-way load bearing is used to support the worm wheel so that it can bear large radial force and axial force at the same time; an elastic device is used to keep the worm wheel and the worm in contact at all times so that there is no gap in transmission; a rotatable dial is used to replace the traditional fixed dial so that zero operation can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 is a schematic diagram of the present invention;

[0013] Figure 2 The present invention Figure 1 Schematic diagram of the AA section;

[0014] Figure 3 The present invention Figure 2 Middle M is a partial enlarged schematic diagram;

[0015] Figure 4 The present invention Figure 2 Schematic diagram of the middle BB section;

[0016] Figure 5 The present invention Figure 1 The N part is enlarged in the figure;

[0017] Figure 6 It is a three-dimensional appearance schematic diagram of the present invention;

[0018] In the figure, 1. worm wheel, 2. worm, 3. first nut, 4. bidirectional force bearing, 5. second nut, 6. support shaft, 7. first screw, 8. base, 9. output turntable, 10. first sealing ring, 11. second sealing ring, 12. third nut, 13. second bearing, 14. fourth nut, 15. active bearing seat, 16. shaft retaining spring, 17. third bearing, 18. hole retaining spring, 19. driven bearing seat, 20. pole Ear, 21. Through hole, 22. Guide column, 23. Spring, 24. Gasket, 25. Pressing nut, 26. Elastic coupling, 27. Motor connecting seat, 28. Third sealing ring, 29. End cover, 30. Plug, 31. End face sealing ring, 32. First pin hole, 33. Second pin hole, 34. Turn pin, 35. Scale ring, 36. Set screw, 37. Indicator needle, 38. Groove, 39. Sensor sheet, 40. Photoelectric switch. DETAILED DESCRIPTION

[0019] like Figure 1 , Figure 2 , Figure 3 A worm gear reducer includes a worm wheel 1 and a worm 2. A first nut 3 fixes the outer ring of a bidirectional force bearing 4 to the inner cavity of the worm wheel 1. A second nut 5 fixes the inner ring of the bidirectional force bearing 4 to a support shaft 6. A first screw 7 fixes the support shaft 6 to the bottom of the inner cavity of a base 8. An output turntable 9 is connected to the upper part of the worm wheel 1. A first sealing ring 10 is provided between the outer diameter of the worm wheel 1 and the inner cavity of the base 8. A second sealing ring 11 is provided between the upper inner cavity of the worm wheel 1 and the second nut 5. A third nut 12 fixes the active end of the worm 2 to the inner ring of a second bearing 13. A fourth nut 14 fixes the outer ring of the second bearing 13 to the inner cavity of an active bearing seat 15. A shaft retaining ring 16 fixes the driven end of the worm 2 to the inner ring of a third bearing 17. The outer ring of the third bearing is fixed to the inner cavity of the driven bearing seat 19 with a retaining ring 18. The driven bearing seat 19 has a protruding ear 20, and the ear 20 has a through hole 21. The guide column 22 is fixed to the base 8 through the through hole 21. The spring 23 and the gasket 24 are fitted on the guide column 22. The clamping nut 25 presses the spring 23 and the gasket 24 on the surface of the ear 20 through threads; the active end of the worm 2 is connected with an elastic coupling 26, and the outside of the elastic coupling 26 is provided with a motor connecting seat 27, and the motor connecting seat 27 is fixed to one side of the base 8; a third sealing ring 28 is provided between the active end of the worm 2 and the base, and end covers 29 and plugs 30 are provided on both sides of the base 8, and an end face sealing ring 31 is provided between the support shaft 6 and the base 8.

[0020] like Figure 4As shown, the active bearing seat 15 has first pin holes 32 on its upper and lower surfaces, and a second pin hole 33 on the corresponding base 8, and a rotating pin 34 is built into the pin hole. The rotating pin 34 and the first pin hole 32 are interference fit, and the rotating pin 34 and the second pin hole 33 are clearance fit, thus forming a rotatable hinge.

[0021] like Figure 5 As shown, the output turntable 9 has two outer diameters, and a scale ring 35 is arranged on the smaller outer diameter close to the base 8. The scale ring 35 is connected to the output turntable 9 by a set screw 36, and an indicator needle 37 is fixed on the base 8. When the current position of the present invention needs to be reset to zero, the set screw 36 is first loosened, and after the zero position is aligned, it is re-tightened.

[0022] like Figure 6 As shown, there is a groove 38 on the output turntable 9, and a sensor sheet 39 is fixed in the groove 38 by screws, and a photoelectric switch 40 is fixed on the base 8. These are used as origin switches.

[0023] When the present invention is working, the motor is first fixed on the motor connection seat 27, and the motor drives the worm 2 to rotate through the elastic coupling 26, and then drives the worm 1 to move, and finally drives the output turntable 9 to make precise movements. In the whole process, the worm 2 takes the rotating pin 34 as the rotation center, and the spring 23 applies pressure, so that the worm 2 and the worm wheel are always in elastic contact, and even if there are errors in the worm wheel and worm processing parts and the thermal expansion and contraction of the material, they can be automatically compensated to achieve gapless transmission.

[0024] The bidirectional load bearing 4 in the present invention at least includes a cross roller bearing, a double row angular contact ball bearing and a pair of angular contact ball bearings. A feature of these bearings is that they can not only withstand radial force and axial force, but also the clearance of the bearing itself is controlled by the bearing manufacturer, eliminating the risk of poor control of the clearance when the bearing is installed manually.

[0025] The second bearing 13 in the present invention at least includes a double-row angular contact ball bearing and a paired angular contact ball bearing.

[0026] The above is only a preferred specific implementation method of the present invention. Any equivalent replacement or change made by any technician familiar with the technical field according to the technical solution and its improved conception shall be included in the protection scope of the present application.

Claims

1. A worm gear reducer, comprising a worm wheel and a worm, characterized in that: The first nut fixes the outer ring of the bidirectional force bearing to the inner cavity of the worm wheel, the second nut fixes the inner ring of the bidirectional force bearing to the support shaft, the first screw fixes the support shaft to the bottom of the inner cavity of the base, the upper part of the worm wheel is connected to the output turntable, there is a first sealing ring between the outer diameter of the worm wheel and the inner cavity of the base, and there is a second sealing ring between the upper inner cavity of the worm wheel and the second nut; the third nut fixes the active end of the worm to the inner ring of the second bearing, the fourth nut fixes the outer ring of the second bearing to the inner cavity of the active bearing seat, the shaft uses a retaining ring to fix the driven end of the worm to the inner ring of the third bearing, and the hole The outer ring of the third bearing is fixed in the inner cavity of the driven bearing seat by a retaining ring. The driven bearing seat has a protruding ear with a through hole on the ear. The guide column is fixed to the base through the through hole. The spring and the gasket are fitted on the guide column. The clamping nut presses the spring and the gasket onto the surface of the ear through a thread. The active end of the worm is connected to an elastic coupling, and a motor connecting seat is provided on the outside of the elastic coupling, which is fixed to one side of the base. A third sealing ring is provided between the active end of the worm and the base, and end covers and plugs are provided on both side surfaces of the base, and an end face sealing ring is provided between the support shaft and the base.

2. The worm gear reducer according to claim 1, characterized in that: The active bearing seat has first pin holes on its upper and lower surfaces, and a second pin hole on the corresponding base, wherein a rotating pin is built into the pin hole.

3. The worm gear reducer according to claim 1, characterized in that: The output rotary disc has two outer diameters, a scale ring is arranged on the smaller outer diameter close to the base, the scale ring is connected to the output rotary disc by a set screw, and an indicating needle is fixed on the base.

4. The worm gear reducer according to claim 1, characterized in that: The output turntable base is provided with a groove, the induction sheet is fixed in the groove by screws, and a photoelectric switch is fixed on the base.

5. The worm gear reducer according to claim 1, characterized in that: The bidirectional load-bearing bearing at least includes a crossed roller bearing, a double-row angular contact ball bearing and angular contact ball bearings installed in pairs.

6. The worm gear reducer according to claim 1, characterized in that: The second bearing at least includes a double-row angular contact ball bearing and a pair-mounted angular contact ball bearing.

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