Combined type planetary gear speed adjusting device

Abstract

The utility model provides a combined type planetary gear speed adjusting device which comprises an installation assembly, a sun gear assembly, a planet gear assembly and a flange, the installation assembly is used for installing the sun gear assembly and the planet gear assembly, and the inner side of the flange is in transmission connection with the sun gear assembly through the planet gear assembly; the planet wheel assembly is provided with a first gear part and a first friction transmission part; the sun gear assembly is provided with a second gear part and a second friction transmission part; the first gear part and the second gear part are assembled in a meshed mode, the second friction transmission part and the first friction transmission part are in friction transmission connection, and the first friction transmission part and the flange are in friction transmission connection. The performance of the speed adjusting device can be obviously improved, and the speed adjusting device in the scheme has the advantages of overload protection, small return difference, large transmission torque and long service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of planetary gears, specifically to a kind of composite planetary gear speed regulating device. BACKGROUND

[0002] Friction reducer is a kind of transmission device using friction to transmit motion or power. Compared with gear reducer, friction reducer has the characteristics of low noise and zero backlash, because it transmits motion or power only by friction, not by gear teeth. In addition, more importantly, friction reducer has the characteristic of overload protection.

[0003] For friction reducer, the key is whether enough normal force can be generated on the contact surface. Some patents, such as patent JP2005264969A, designed a complex planetary support in order to generate enough friction between the planetary roller, the sun shaft and the fixed roller ring, which led to an increase in volume, weight and cost.

[0004] For example, patent DE19951988B4, a single-stage toothless planetary reducer, has a small transmission and low output torque. Moreover, the toothless planetary gear is easily damaged when the bearing is squeezed because it is used in conjunction with the planetary support. Therefore, the current friction reducer mainly has the problems of complex structure, low transmission torque and easy squeezing loss.

[0005] Therefore, a new structure is needed to improve the performance of the reducer. SUMMARY

[0006] To solve the above technical problems, the utility model provides a kind of composite planetary gear speed regulating device, can significantly improve the performance of speed regulating device, the speed regulating device in the scheme has the advantages of overload protection, small backlash, large transmission torque and high service life.

[0007] Specifically, the utility model provides a kind of composite planetary gear speed regulating device, including: installation component, sun gear component, planetary gear component and flange, the installation component is used to install the sun gear component and the planetary gear component, the inner side of the flange is driven connection with the sun gear component through planetary gear component;

[0008] The planetary gear component has a first gear part and a first friction transmission part;

[0009] The sun gear component has a second gear part and a second friction transmission part;

[0010] The first gear part is engaged with the second gear part, the second friction transmission part is frictionally connected with the first friction transmission part, and the first friction transmission part is frictionally connected with the flange.

[0011] Preferably, the first friction transmission part is cylindrical, and the first friction transmission part has a hollow structure.

[0012] Preferably, the first friction transmission part and the first gear part are integrally formed.

[0013] Preferably, the side wall thickness of the first gear part is greater than the side wall thickness of the first friction transmission part.

[0014] Preferably, the number of the planetary gear assemblies is not less than three, and each of the planetary gear assemblies has a planetary shaft, and the first gear part is mounted on the planetary shaft through a first bearing.

[0015] Preferably, two of the first gear parts are located at two ends of the first friction transmission part in the axial direction, or two of the first friction transmission parts are located at two ends of the first gear part in the axial direction.

[0016] Preferably, the sun gear assembly further has a column body, the second gear part is coaxially fixed on the column body, and the second friction transmission part is cylindrical and is sleeved on the column body.

[0017] Preferably, the second friction transmission part is gap-fitted with the column body.

[0018] Preferably, the mounting assembly comprises a first planetary support, a second planetary support and an inner ring assembly,

[0019] The first planetary support and the second planetary support are respectively mounted in the inner ring assembly through second bearings.

[0020] The sun gear assembly is rotationally connected with the first planetary support and the second planetary support.

[0021] Two ends of the planetary shaft of the planetary gear assembly are respectively fastened to the first planetary support and the second planetary support.

[0022] The flange is coaxially arranged with the inner ring assembly.

[0023] Preferably, the flange is rotationally connected with the inner ring assembly through a fourth bearing.

[0024] The inner ring assembly comprises a plurality of inner rings, and the inner rings are provided with third gear parts for engaging the first gear parts. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced.

[0026] Figure 1 is a perspective structural schematic view of the compound planetary gear speed regulating device proposed in the embodiment;

[0027] Figure 2 is a perspective structural schematic view of the compound planetary gear speed regulating device proposed in the embodiment;

[0028] Figure 3 is a front view of the compound planetary gear speed regulating device proposed in the embodiment;

[0029] Figure 4 is a sectional view in the A-A direction of Figure 3

[0030] Figure 5 is a sectional view in the B-B direction of Figure 3

[0031] Figure 6 is a front view of the planetary gear assembly in the embodiment;

[0032] Figure 7 is a sectional view in the C-C direction of Figure 6

[0033] Figure 8 is a front view of the sun gear assembly in the embodiment;

[0034] Figure 9 is a sectional view in the D-D direction of Figure 8

[0035] The reference signs involved in the drawings are as follows:

[0036] 11 - mounting assembly; 12 - sun gear assembly; 13 - planetary gear assembly; 14 - flange; 15 - first gear part; 16 - first friction transmission part; 17 - second gear part; 18 - second friction transmission part; 19 - hollow structure; 20 - planetary shaft; 21 - first bearing; 22 - cylinder; 23 - first planetary support; 24 - second planetary support; 25 - inner ring; 26 - fourth bearing; 27 - third gear part; 28 - second bearing; 29 - third bearing. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be further described below in combination with specific embodiments, but the present application is not limited to these embodiments.

[0038] As Figures 1 to 9 ​​​​As shown, the embodiment proposes a composite planetary gear speed regulating device, comprising: a mounting assembly 11, a sun gear assembly 12, a planetary gear assembly 13 and a flange 14, the mounting assembly 11 is used for mounting the sun gear assembly 12 and the planetary gear assembly 13, the inner side of the flange 14 is in transmission connection with the sun gear assembly 12 through the planetary gear assembly 13;

[0039] The planetary gear assembly 13 has a first gear part 15 and a first friction transmission part 16;

[0040] The sun gear assembly 12 has a second gear part 17 and a second friction transmission part 18;

[0041] The first gear part 15 is in meshing assembly with the second gear part 17, the second friction transmission part 18 is in friction transmission connection with the first friction transmission part 16, and the first friction transmission part 16 is in friction transmission connection with the flange 14.

[0042] The technical effect of the scheme is that the performance of the speed regulating device can be significantly improved, and the speed regulating device has the advantages of overload protection, small backlash, large transmission torque and long service life, and the specific performance improvement principle is as follows:

[0043] The principle of overload protection: in the scheme, the composite transmission mode of gear meshing and friction meshing is adopted to realize power transmission, and since the flange 14 and the first friction transmission part 16 adopt the assembly relationship of friction meshing, the purpose of overload protection is effectively achieved, and the system weight, volume and production cost can be effectively reduced. The flange 14 in the scheme is used to install the output shaft or the input shaft through the connecting structure. In addition, the technical term friction meshing in the scheme refers to power transmission through friction.

[0044] The principle of small backlash: in order to achieve a larger transmission ratio, the gears in the prior art are designed to be multi-stage, and the superposition of multi-stage gears will cause the gap effect of the gears to be superimposed, so there will be a large backlash in the prior art, which will reduce the transmission accuracy. In the scheme, the two-stage transmission mode of gear meshing and friction meshing is adopted, which can achieve a transmission ratio of 1000:1 and has the advantage of fewer series connections. Under the dual action of friction transmission and gear meshing transmission in the scheme, the backlash can be significantly reduced.

[0045] The principle of large transmission torque: friction transmission realizes movement and power transmission through pressing force, and in comparison with the same volume of gear transmission, the transmission torque of friction transmission is smaller; the first stage of the gear meshing-friction composite planetary reducer in the scheme adopts the gear meshing technical scheme, which can significantly increase the transmission torque.

[0046] The principle of long service life: the friction transmission in the prior art realizes the transmission of movement or power through the pressing force, and a large pre-tightening force exists in the parts, especially the bearing, which leads to insufficient service life. In the scheme, the gear meshing-friction composite scheme is adopted, the technical scheme of combining the gear meshing and the friction transmission is adopted, and the bearing does not need to be installed at the position of the friction transmission, which helps to improve the service life of the device.

[0047] As an embodiment of the present embodiment, as shown in Figure 6 and Figure 7 The first friction transmission part 16 is cylindrical, and the first friction transmission part 16 has a hollow structure 19.

[0048] The technical effect of the present scheme is that the cylindrical shell of the first friction transmission part 16 is more easily deformed, the friction contact surface is tightly fitted, and the movement and power transmission are facilitated; the planetary gear assembly 13 is made of high-stiffness alloy steel, so that the first friction transmission part 16 is easily compressed by the second friction transmission part 18 and the flange 14, thereby generating sufficient friction force, and further transmitting the rotational movement of the sun gear assembly 12 to the output shaft of the flange 14.

[0049] As an embodiment of the present embodiment, the first friction transmission part 16 and the first gear part 15 are integrally formed, and high-stiffness alloy steel is adopted.

[0050] Further, the thickness of the side wall of the first gear part 15 is greater than the thickness of the side wall of the first friction transmission part 16. The technical effect of the present scheme is that the first friction transmission part 16 is more easily compressed and deformed, and the first gear part 15 is not easily compressed and deformed, which can significantly improve the transmission performance.

[0051] Further, the planetary gear assembly 13 has a planetary shaft 20, and the first gear part 15 is installed on the planetary shaft 20 through a first bearing 21. The first bearing 21 adopts a deep groove ball bearing.

[0052] In the present scheme, the number of planetary gear assemblies 13 is different under different output torques. When the output torque is small, the number of planetary gear assemblies 13 is small, but not less than three.

[0053] Further, the farthest point on the circumferential surface of the first friction transmission part 16 away from the axis of the sun gear assembly 12 is greater than the radius of the circle on which the inner wall of the flange 14 is located.

[0054] As an embodiment of the present embodiment, two first gear parts 15 are located at both ends of the axis direction of the first friction transmission part 16; or, two first friction transmission parts 16 are located at both ends of the axis direction of the first gear part 15.

[0055] As an embodiment of the present embodiment, the sun gear assembly 12 further has a column 22, and the second gear part 17 is coaxially fixed on the column 22; the second friction transmission part 18 is cylindrical, and the second friction transmission part 18 is sleeved on the column 22.

[0056] As an embodiment of the present embodiment, the second friction transmission part 18 is in clearance fit with the column 22.

[0057] As an embodiment of the present embodiment, the mounting assembly 11 includes a first planetary support 23, a second planetary support 24 and an inner ring assembly,

[0058] The first planetary support 23 and the second planetary support 24 are respectively installed in the inner ring assembly through second bearings 28;

[0059] The sun gear assembly 12 is rotationally connected with the first planetary support 23 and the second planetary support 24 through third bearings 29 respectively;

[0060] Both ends of the planetary shaft 20 of the planetary gear assembly 13 are fastened and connected with the first planetary support 23 and the second planetary support 24 through bolts respectively;

[0061] The flange 14 is coaxially arranged with the inner ring assembly.

[0062] Further, the inner ring assembly has two inner rings 25, and further, both ends of the flange 14 along the axial direction are installed between the two inner rings 25 through fourth bearings 26. One inner ring 25 is installed with the first planetary support 23 through a bearing, and the other inner ring 25 is installed with the second planetary support 24 through a bearing, and a sealing ring is arranged at the assembly position of the inner ring assembly and the first planetary support 23 and the second planetary support 24. Among them, the fourth bearing 26 can adopt a thrust bearing.

[0063] Further, the inner ring 25 is further provided with a third gear part 27 for engaging the first gear part 15. When the motor drives the sun gear assembly 12 to rotate, the planetary gear assembly 13 will rotate around the sun gear assembly 12 and rotate around the sun gear assembly 12 at the same time, and will rotate the flange 14 through friction, so as to realize the transmission of motion or power; wherein the motor is not given in the figure.

[0064] Since the first gear part 15 is engaged with the second gear part 17, and the first gear part 15 is engaged with the third gear part 27 of the inner ring 25, the situation of slipping is avoided, and the first friction transmission part 16 and the flange 14 belong to friction transmission, and when the acting load is greater than the friction force, sliding will occur, thereby playing a role of overload protection.

[0065] Specific working process: the sun wheel assembly 12 rotates under the drive of the motor, the second gear part 17 meshes with the first gear part 15 to drive, since the inner ring assembly is fixed, the planetary gear assembly 13 will rotate, and at the same time drive the first planetary support 23 and the second planetary support 24 and the planetary shaft 20 to rotate; the first friction transmission part 16 drives the flange 14 to rotate through the extrusion of the second friction transmission part 18, the flange 14 realizes the function of speed reduction and torque increase as an output component, since the whole transmission is realized by gear meshing and friction driving, the motion can be more strictly without backlash, so as to improve the transmission efficiency and realize the function of overload protection; moreover, in the gear meshing-friction composite planetary reducer, only the first friction transmission part 16 of the planetary gear transmits motion through elastic deformation and friction, since it is hollow, it does not need bearing to support, the extrusion of the first friction transmission part 16 on the bearing due to deformation is avoided, so as to improve the service life of the reducer;

[0066] In addition, by changing the gear parameters of the sun wheel assembly 12, the inner ring assembly and the planetary gear assembly 13 and the diameter of the first friction transmission part 16 of the planetary gear assembly 13, the transmission ratio from 5:1 to 1000:1 can be realized, so it has wide application prospect.

[0067] In general cases, the sun wheel assembly 12 is used as an input stage, the flange 14 is used as an output stage, and the inner ring 25 is fixed.

[0068] In addition, according to needs, the flange 14 can also be used as an input stage and the sun wheel as an output stage.

[0069] Actually, since the gear meshing-friction composite planetary reducer is similar to planetary transmission, any one of the cylinder 22 of the sun wheel assembly 12, the flange 14 and the planetary support can be fixed, and the other two are used as an input stage and an output stage respectively, of course, sometimes it can also be made into a differential form; the planetary support in this paper refers to the first planetary support 23 and the second planetary support 24.

[0070] In addition, the design parameters between the first gear part 15, the first gear part 15 and the third gear part 27 of the inner ring 25 need to meet the conditions of planetary reducer transmission.

[0071] Although the embodiments of the utility model are discussed above, the utility model is not limited to this specific embodiment, it can be changed in many ways without departing from the original intention of the utility model.

[0072] For ordinary skilled persons in the art, without departing from the creative concept of the utility model, a number of deformations and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. A compound planetary gear speed adjustment device, characterized by, The application relates to a sun-and-planet gear transmission device. The device comprises a mounting assembly (11), a sun gear assembly (12), a planet gear assembly (13) and a flange (14), the mounting assembly (11) is used for mounting the sun gear assembly (12) and the planet gear assembly (13), the inner side of the flange (14) is in transmission connection with the sun gear assembly (12) through the planet gear assembly (13). The planet gear assembly (13) has a first gear part (15) and a first friction transmission part (16). The sun gear assembly (12) has a second gear part (17) and a second friction transmission part (18). The first gear part (15) is in meshing assembly with the second gear part (17), the second friction transmission part (18) is in friction transmission connection with the first friction transmission part (16), and the first friction transmission part (16) is in friction transmission connection with the flange (14).

2. The compound planetary gear speed adjustment device according to claim 1, characterized in that, The first friction transmission part (16) is cylindrical, and the first friction transmission part (16) has a hollow structure (19).

3. The compound planetary gear speed adjustment device of claim 2, wherein, The first friction transmission part (16) and the first gear part (15) are integrally formed.

4. A compound epicyclic gear speed adjustment device according to any one of claims 1 to 3, wherein The side wall thickness of the first gear part (15) is greater than the side wall thickness of the first friction transmission part (16).

5. The compound planetary gear speed adjustment device according to any one of claims 1 to 3, characterized in that, The number of the planet gear assemblies (13) is not less than three, and each planet gear assembly (13) has a planet shaft (20), and the first gear part (15) is mounted on the planet shaft (20) through a first bearing (21).

6. The compound planetary gear speed adjustment device according to any one of claims 1 to 3, characterized by Two first gear parts (15) are located at two ends of the axis direction of the first friction transmission part (16); or two first friction transmission parts (16) are located at two ends of the axis direction of the first gear part (15).

7. The compound planetary gear speed adjustment device of claim 1, wherein The sun gear assembly (12) further has a column body (22), the second gear part (17) is fixed coaxially on the column body (22), the second friction transmission part (18) is cylindrical, and the second friction transmission part (18) is sleeved on the column body (22).

8. The compound planetary gear speed adjustment device of claim 7, wherein, The second friction transmission part (18) is in clearance fit with the column body (22).

9. The compound planetary gear speed adjustment device of claim 1, wherein, The mounting assembly (11) comprises a first planet support (23), a second planet support (24) and an inner ring assembly, The first planet support (23) and the second planet support (24) are respectively mounted in the inner ring assembly through second bearings (28); The sun gear assembly (12) is in rotary connection with the first planet support (23) and the second planet support (24) respectively; The two ends of the planet shaft (20) of the planet gear assembly (13) are respectively in fastening connection with the first planet support (23) and the second planet support (24); The flange (14) is coaxially arranged between the inner ring assembly.

10. The compound planetary gear speed adjustment device of claim 9, wherein, The flange (14) is in rotary connection with the inner ring assembly through a fourth bearing (26); The inner ring assembly comprises a plurality of inner rings (25), and the inner rings (25) are provided with third gear parts (27) used for meshing the first gear parts (15).

Images