Bearing type miniature RV speed reducer

Abstract

The utility model discloses a bearing type miniature RV speed reducer which comprises a cycloidal shell, an eccentric shaft, an input end flange, a first cycloidal gear, a second cycloidal gear, a cycloidal roller pin, a pin column, a shell locking screw and an output integral cross bearing, and the output integral cross bearing comprises a cross bearing outer ring, a cross bearing inner ring, a cross roller, a plug and a plug screw. The integral filling type crossed roller bearing is directly adopted as an output mechanism, the diameter of the speed reducer can be reduced, assembly is more convenient, the outer ring of the crossed bearing is arranged into a whole, no screw is exposed outside the outer ring of the crossed bearing, the appearance attractiveness of the speed reducer is greatly improved, meanwhile, the length of the speed reducer can be shortened, and the cost of the speed reducer is reduced. And the production cost and the weight of the speed reducer are reduced. In addition, roller pin type bearings without inner and outer rings and retainers can be adopted between the eccentric part of the eccentric shaft and the two cycloidal gears, and the diameter of the speed reducer can be further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, and more specifically, to a bearing type micro RV reducer. Background Art

[0002] The existing RV reducer may include a cycloid housing, an input end cover, a first input end bearing, an input end flange, a second input end bearing, a first cycloid wheel, a second cycloid wheel, a pin, an eccentric shaft, a first output end bearing, an output end flange, a second output end bearing and an output end cover. However, the second output end bearing installed between the output end flange and the output end cover generally adopts a deep groove ball bearing with inner and outer rings and a retaining frame, which will increase the diameter of the bearing, thereby causing the overall diameter of the reducer to increase.

[0003] In order to improve this problem, some reducers with crossed roller bearings without inner and outer rings and retainers at the output end are currently available on the market, such as the reducer output end module and cycloid reducer with patent application number 202322298845.0. The reducer sets the output end housing, output end cover, output end flange and crossed roller bearing into an integral module, and the crossed roller bearing does not need to be provided with inner and outer rings of the bearing, which can reduce the diameter of the reducer and reduce the cost of the reducer. However, the reducer still has the following shortcomings: 1. The outer ring of the crossed roller bearing needs to be assembled with two independent parts, the output end housing and the output end cover. During installation, multiple additional screws need to be added to fix the outer ring of the crossed bearing and the output end cover together. The head of the screw will be exposed on the outside of the reducer, affecting the appearance of the reducer, and the screw will increase the length and weight of the reducer; 2. The diameter of the reducer is generally 50-60 mm, which cannot be miniaturized. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and provide a bearing-type micro RV reducer which adopts an integral bullet-filled cross roller bearing as an output mechanism, has a smaller size, is easy to assemble, and has a beautiful appearance.

[0005] To achieve the above-mentioned purpose, the utility model provides a bearing-type micro RV reducer, comprising a cycloid housing, an eccentric shaft, an input end flange, a first cycloid wheel, a second cycloid wheel, a cycloid needle roller, a pin, an output integral cross bearing and a housing locking screw, wherein the output integral cross bearing comprises a cross bearing outer ring, a cross bearing inner ring, a cross roller, a plug and a plug screw, the cross bearing inner ring is installed at the center hole position of the cross bearing outer ring, an annular cross roller mounting groove is provided between the inner wall of the cross bearing outer ring and the outer wall of the cross bearing inner ring, a plurality of cross rollers are provided and installed in the cross roller mounting groove, a cross roller inlet connected to the cross roller mounting groove is provided at one end of the cross bearing inner ring, the plug is installed at the cross roller inlet, the plug is fixedly connected to the cross bearing inner ring through the plug screw, the input end flange is installed at one end of the cycloid housing, the cross bearing outer ring is installed at the At the other end of the cycloid housing, the cycloid housing is fixedly connected to the input end flange and the outer ring of the cross bearing by a housing locking screw, the first cycloid wheel and the second cycloid wheel are respectively installed between the input end flange and the inner ring of the cross bearing, the two ends of the eccentric shaft are respectively inserted into the center holes of the input end flange and the inner ring of the cross bearing, one end of the eccentric shaft is rotatably connected to the input end flange through the first eccentric shaft mounting bearing, the other end of the eccentric shaft passes through the center holes of the first cycloid wheel and the second cycloid wheel in turn, and then passes through the second eccentric shaft mounting bearing to realize rotational connection with the inner ring of the cross bearing, a plurality of cycloid rollers are provided and are circumferentially arranged between the input end flange and the outer ring of the cross bearing, the cycloid rollers are located between the inner teeth of the cycloid housing and the outer teeth of the first cycloid wheel and the second cycloid wheel, one end of the pin is inserted into the pin insertion hole of the inner ring of the cross bearing, and the other end of the pin passes through the pin through holes of the second cycloid wheel and the first cycloid wheel.

[0006] Preferably, a plurality of first needle rollers distributed in a ring shape are provided between the first eccentric portion of the eccentric shaft and the first cycloidal wheel, a plurality of second needle rollers distributed in a ring shape are provided between the second eccentric portion of the eccentric shaft and the first cycloidal wheel, a separating convex ring is provided between the first eccentric portion and the second eccentric portion of the eccentric shaft, and the eccentric shaft is provided with a first retaining ring located between the first needle roller and the first eccentric shaft mounting bearing, and a second retaining ring located between the second needle roller and the second eccentric shaft mounting bearing.

[0007] Preferably, a cycloidal wheel spacer is provided between the first cycloidal wheel and the second cycloidal wheel.

[0008] Preferably, a wear-resistant ring is provided between the input end flange and the cycloid needle roller.

[0009] Preferably, sealing rings are provided between one end of the eccentric shaft and the input end flange, and between the other end of the eccentric shaft and the inner ring of the cross bearing.

[0010] Preferably, the outer wall of the inner ring of the cross bearing is provided with an oil seal located between the inner ring of the cross bearing and the outer ring of the cross bearing.

[0011] Preferably, the first eccentric shaft mounting bearing and the second eccentric shaft mounting bearing are respectively configured as deep groove ball bearings.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The structural design of the utility model is reasonable. An integral bullet-filled cross roller bearing is directly adopted as the output mechanism, which can reduce the diameter of the reducer. After opening the plug, the cross roller can be quickly filled between the outer ring of the cross bearing and the inner ring of the cross bearing, which makes assembly more convenient. The outer ring of the cross bearing is arranged as a whole, and there is no need to adopt the bearing outer ring structure in which the output end housing and the output end cover of the prior art are assembled by screws. In this way, the outer ring of the cross bearing of the utility model has no exposed screws, which greatly improves the appearance of the reducer. At the same time, it can also shorten the length of the reducer and reduce the production cost and weight of the reducer.

[0014] 2. The eccentric part of the eccentric shaft of the utility model and the two cycloid wheels respectively use needle roller bearings (full needle bearings) without inner and outer rings and retainers, which can further reduce the diameter of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the structure of the bearing type micro RV reducer provided by the embodiment of the utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of the bearing type micro RV reducer provided by the embodiment of the utility model. Figure 2 ;

[0018] Figure 3 It is a cross-sectional view of a bearing-type micro RV reducer provided in an embodiment of the utility model;

[0019] Figure 4 It is an exploded view of a bearing-type micro RV reducer provided in an embodiment of the utility model;

[0020] Figure 5It is a schematic diagram of the structure between the eccentric shaft and the cycloid wheel provided in an embodiment of the utility model;

[0021] Figure 6 It is a schematic structural diagram of an output integral cross bearing provided by an embodiment of the utility model with cross rollers installed. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Please refer to Figures 1 to 4 An embodiment of the utility model provides a bearing-type micro RV reducer, including a cycloid housing 1, an eccentric shaft 2, an input end flange 3, a first cycloid wheel 4, a second cycloid wheel 5, a cycloid needle roller 6, a pin 7, a housing locking screw 10, a first eccentric shaft mounting bearing 11, a second eccentric shaft mounting bearing 12 and an output integral cross bearing and other components. The various components of this embodiment are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 3 , Figure 4 and Figure 6 As shown, the output integral cross bearing may include a cross bearing outer ring 8, a cross bearing inner ring 9, cross rollers 16, a plug 18 and a plug screw 19. The cross bearing inner ring 9 is rotatably mounted at the center hole of the cross bearing outer ring. An annular cross roller installation groove 15 (composed of two upper and lower V-shaped grooves) is provided between the inner wall of the cross bearing outer ring 8 and the outer wall of the cross bearing inner ring 9. A plurality of cross rollers 16 are provided and cross-mounted in the cross roller installation groove 15. A cross roller inlet 17 communicating with the cross roller installation groove 15 is provided at one end of the cross bearing inner ring 9. The plug 18 is installed at the cross roller inlet 17. The plug 18 is fixedly connected to the cross bearing inner ring 9 through the plug screw 19. During assembly, the plug 18 can be opened, and all cross rollers 16 can be filled one by one between the cross bearing outer ring 8 and the cross bearing inner ring 9 through the cross roller inlet 17.

[0025] like Figures 1 to 3 As shown, the input end flange 3 is installed at one end of the cycloid housing 1, and the cross bearing outer ring 8 is installed at the other end of the cycloid housing 1. The cycloid housing 1 can be fixedly connected to the input end flange 3 and the cross bearing outer ring 8 by four evenly distributed housing locking screws 10.

[0026] like Figure 3 As shown, the two ends of the eccentric shaft 2 are respectively inserted into the center holes of the input end flange 3 and the inner ring 9 of the cross bearing, one end of the eccentric shaft 2 is rotatably connected to the input end flange 3 through the first eccentric shaft mounting bearing 11, and the other end of the eccentric shaft 2 is rotatably connected to the inner ring 9 of the cross bearing through the second eccentric shaft mounting bearing 12. Preferably, the first eccentric shaft mounting bearing 11 and the second eccentric shaft mounting bearing 12 can be respectively set as deep groove ball bearings. Of course, in other embodiments, other types of bearings can also be used.

[0027] like Figures 3 to 5 As shown, the first cycloid wheel 4 and the second cycloid wheel 5 are respectively installed between the input end flange 3 and the inner ring 9 of the cross bearing, and the eccentric shaft 2 can pass through the center holes of the first cycloid wheel 4 and the second cycloid wheel 5. The outer walls of the first cycloid wheel 4 and the second cycloid wheel 5 are both provided with external teeth, and the first cycloid wheel 4 and the second cycloid wheel 5 are both provided with pin through holes 14 evenly distributed around the center holes thereof.

[0028] As a further improvement of the present embodiment, a plurality of first needle rollers 20 distributed in an annular shape are provided between the first eccentric portion 201 of the eccentric shaft 2 and the first cycloidal wheel 4, a plurality of second needle rollers 21 distributed in an annular shape are provided between the second eccentric portion 202 of the eccentric shaft 2 and the first cycloidal wheel 4, a separating convex ring 22 for separating the first needle roller 20 and the second needle roller 21 is provided between the first eccentric portion 201 and the second eccentric portion 202 of the eccentric shaft 2, and a first retaining ring 23 located between the first needle roller 20 and the first eccentric shaft mounting bearing 11 and a second retaining ring 24 located between the second needle roller 21 and the second eccentric shaft mounting bearing 12 are provided on the eccentric shaft 2. The first retaining ring 23 and the second retaining ring 24 can limit the first needle roller 20 and the second needle roller 21 respectively.

[0029] In this embodiment, all first needle rollers 20 and all second needle rollers 21 can form a needle roller bearing (full needle bearing) without inner and outer rings and retaining frames between the eccentric portion of the eccentric shaft and the cycloidal wheel, which can further reduce the diameter of the reducer.

[0030] like Figures 3 to 6 As shown, a plurality of cycloid needle rollers 6 are provided and are arranged around the input end flange 3 and the cross bearing outer ring 8. The cycloid needle rollers 6 are located between the inner teeth of the inner wall of the cycloid housing 1 and the outer teeth of the first cycloid wheel 4 and the second cycloid wheel 5. A plurality of pins 7 can also be provided. One end of the pin 7 is inserted into the pin socket 13 of the cross bearing inner ring 9, and the other end of the pin 7 passes through the pin through hole 14 of the second cycloid wheel 5 and the first cycloid wheel 4.

[0031] like Figure 3 and Figure 4As shown, a cycloidal wheel spacer 25 may be provided between the first cycloidal wheel 4 and the second cycloidal wheel 5 , and a wear-resistant ring 26 may be provided between the input end flange 3 and the cycloidal needle roller 6 .

[0032] In order to provide the reducer with tightness, such as Figure 3 and Figure 4 As shown, O-type sealing rings 27 may be provided between one end of the eccentric shaft 2 and the input end flange 3 , and between the other end of the eccentric shaft 2 and the inner ring 9 of the cross bearing.

[0033] In addition, if Figures 2 to 4 As shown, an oil seal 28 located between the cross bearing inner ring 9 and the cross bearing outer ring 8 may also be provided on the outer wall of the cross bearing inner ring 9 .

[0034] The bearing type micro RV reducer of this embodiment has the following advantages:

[0035] 1. The reducer directly adopts an integral bullet-filled cross roller bearing as the output mechanism, which can reduce the diameter of the reducer and make assembly more convenient. Compared with the bearing outer ring structure in which the output end housing and the output end cover are assembled by screws in the prior art, the cross bearing outer ring of the utility model is set as a whole, and there are no screws exposed on the outside of the cross bearing outer ring, which greatly improves the appearance of the reducer, and can also shorten the length of the reducer, reducing the production cost and weight of the reducer;

[0036] 2. Needle roller bearings without inner and outer rings and cages are used between the eccentric part of the eccentric shaft and the two cycloid wheels, which can further reduce the diameter of the reducer;

[0037] 3. The diameter of the reducer can be as small as 30mm and the length can be as small as 18-25mm, which meets the requirements of miniaturization;

[0038] 4. The outer shell structure of the reducer only has the locking screws of the shell exposed to the outside, and the appearance is simple and beautiful.

[0039] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A bearing type micro RV reducer, characterized in that: It includes a cycloid housing, an eccentric shaft, an input end flange, a first cycloid wheel, a second cycloid wheel, a cycloid needle roller, a pin, an output integral cross bearing and a housing locking screw, wherein the output integral cross bearing includes a cross bearing outer ring, a cross bearing inner ring, a cross roller, a plug and a plug screw, the cross bearing inner ring is installed at the center hole position of the cross bearing outer ring, an annular cross roller mounting groove is provided between the inner wall of the cross bearing outer ring and the outer wall of the cross bearing inner ring, a plurality of cross rollers are provided and installed in the cross roller mounting groove, a cross roller inlet connected to the cross roller mounting groove is provided at one end of the cross bearing inner ring, the plug is installed at the cross roller inlet, the plug is fixedly connected to the cross bearing inner ring through the plug screw, the input end flange is installed at one end of the cycloid housing, the cross bearing outer ring is installed at the other end of the cycloid housing, and the cycloid housing The first and second cycloid wheels are respectively installed between the input end flange and the inner ring of the cross bearing, and the two ends of the eccentric shaft are respectively inserted into the center holes of the input end flange and the inner ring of the cross bearing. One end of the eccentric shaft is rotatably connected to the input end flange through the first eccentric shaft mounting bearing, and the other end of the eccentric shaft passes through the center holes of the first and second cycloid wheels in turn and then passes through the second eccentric shaft mounting bearing to realize rotational connection with the inner ring of the cross bearing. A plurality of cycloid rollers are provided and are arranged around the input end flange and the outer ring of the cross bearing. The cycloid rollers are located between the inner teeth of the cycloid housing and the outer teeth of the first and second cycloid wheels. One end of the pin is inserted into the pin insertion hole of the inner ring of the cross bearing, and the other end of the pin passes through the pin through holes of the second cycloid wheel and the first cycloid wheel.

2. A bearing type micro RV reducer according to claim 1, characterized in that: A plurality of first needle rollers distributed in a ring shape are arranged between the first eccentric part of the eccentric shaft and the first cycloidal wheel, a plurality of second needle rollers distributed in a ring shape are arranged between the second eccentric part of the eccentric shaft and the first cycloidal wheel, a separating convex ring is arranged between the first eccentric part and the second eccentric part of the eccentric shaft, a first retaining ring located between the first needle roller and the first eccentric shaft mounting bearing, and a second retaining ring located between the second needle roller and the second eccentric shaft mounting bearing are arranged on the eccentric shaft.

3. The bearing type micro RV reducer according to claim 1, characterized in that: A cycloid wheel spacer is provided between the first cycloid wheel and the second cycloid wheel.

4. The bearing type micro RV reducer according to claim 1, characterized in that: A wear-resistant ring is provided between the input end flange and the cycloid needle roller.

5. The bearing type micro RV reducer according to claim 1, characterized in that: Sealing rings are respectively arranged between one end of the eccentric shaft and the input end flange, and between the other end of the eccentric shaft and the inner ring of the cross bearing.

6. The bearing type micro RV reducer according to claim 1, characterized in that: The outer wall of the inner ring of the cross bearing is provided with an oil seal located between the inner ring of the cross bearing and the outer ring of the cross bearing.

7. The bearing type micro RV reducer according to claim 1, characterized in that: The first eccentric shaft mounting bearing and the second eccentric shaft mounting bearing are respectively configured as deep groove ball bearings.

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