A compact planetary structure

Abstract

The utility model discloses a compact type planet structure, include: planetary gear and planet axle, the planetary gear is rotated and established in the outside of planet axle through at least a first bearing, and the first bearing includes: inner ring body, the coaxial sleeve of inner ring body is established in the outside of planet axle, and the outer wall ring of inner ring body is equipped with at least one raceway, the raceway is rolled with a plurality of rolling bodies, and every rolling body is contacted with the inner wall of planetary gear. The utility model discloses a planet wheel inner wall directly as a part of first bearing outer ring, has omitted the independent outer ring of traditional bearing, has effectively reduced radial dimension, has made planet structure more compact, is applicable to the scene of harsh space requirement, and simultaneously, this design has simplified bearing structure, has reduced processing difficulty and cost.

Description

Technical Field

[0001] This utility model relates to the technical field of gearboxes, and more particularly to a compact planetary structure. Background Technology

[0002] In the field of gearbox mechanical transmission, planetary gear transmission structures are widely used due to their unique transmission advantages.

[0003] However, traditional planetary gear transmission structures have significant shortcomings in terms of compact design, with large radial and axial dimensions that make it difficult to meet the growing demand for compact mechanical transmission systems. In traditional designs, planetary gears typically use bearings with independent outer rings, which not only increases the radial space occupied but also complicates the structure. At the same time, additional positioning components are often required to achieve axial positioning of the bearings, further increasing the structural size and making the assembly process cumbersome. Utility Model Content

[0004] In view of the aforementioned problems with existing planetary gear transmission structures, this paper aims to provide a compact planetary structure.

[0005] The specific technical solution is as follows:

[0006] A compact planetary structure includes: planetary gears and a planetary shaft, wherein the planetary gears are rotatably disposed outside the planetary shaft via at least one first bearing, the first bearing comprising:

[0007] The inner ring body is coaxially sleeved on the outside of the planetary shaft, and the outer wall of the inner ring body is provided with at least one raceway, in which a plurality of rolling elements roll, and each of the rolling elements is in contact with the inner wall of the planetary gear.

[0008] Furthermore, in a preferred embodiment, two first bearings are provided, and two washers and a retaining ring for the bore are coaxially disposed between the two first bearings. The two washers are respectively located in limiting contact with the rolling elements of the two first bearings, and the retaining ring for the bore is disposed between the two washers and coaxially engaged with the inner wall of the planetary gear.

[0009] Furthermore, in a preferred embodiment, the inner wall of the planetary gear is coaxially provided with a groove, and the hole is secured to the groove by a retaining ring.

[0010] Furthermore, as a preferred embodiment, the planetary structure further includes:

[0011] An internal gear ring, which meshes with the planetary gear;

[0012] Two flanges are respectively installed at the two open ends of the internal gear ring, forming a cavity between them;

[0013] A planetary carrier is disposed within the cavity and rotatably mounted coaxially between the two flanges, and the planetary shaft is fixed on the planetary carrier.

[0014] Furthermore, in a preferred embodiment, a limiting step is formed at one end of the planetary shaft, the limiting step is limited by one side of the inner ring body, a spacer is also sleeved on the outside of the planetary shaft, and the other side of the inner ring body is limited and engaged with the planet carrier through the spacer.

[0015] Furthermore, as a preferred embodiment, the planetary carrier is provided with a positioning groove, and the spacer is positioned within the positioning groove.

[0016] Furthermore, as a preferred embodiment, the planetary shaft is fixed to the planet carrier by bolts.

[0017] Furthermore, as a preferred embodiment, a second bearing is provided between the planetary carrier and each of the flanges.

[0018] Furthermore, in a preferred embodiment, a sun axis is coaxially rotatable on the planet carrier, and a sun gear is sleeved on the outside of the sun axis, the sun gear meshing with the planet gears.

[0019] Furthermore, as a preferred embodiment, a third bearing is provided between the sun axis and the planet carrier.

[0020] The positive effects of the above technical solution compared with the existing technology are:

[0021] (1) By directly using the inner wall of the planetary gear as part of the outer ring of the first bearing, this utility model eliminates the independent outer ring of the traditional bearing, effectively reducing the radial dimension and making the planetary structure more compact. It is suitable for scenarios with demanding space requirements. At the same time, this design simplifies the bearing structure and reduces the processing difficulty and cost.

[0022] (2) This utility model uses two first bearings and two washers and a retaining ring for axial positioning, which avoids additional complex positioning components, simplifies the assembly process, and improves assembly efficiency. At the same time, this axial positioning method can ensure the stable installation of the bearing in the planetary gear and ensure the normal rotation of the planetary gear. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a compact planetary structure according to the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first bearing of the compact planetary structure of this utility model;

[0025] In the attached diagram: 1. Planetary shaft; 2. Planetary gear; 3. First bearing; 4. Retaining ring for bore; 5. Washer; 6. Internal gear ring; 7. Flange; 8. Spacer; 9. Bolt; 10. Planetary carrier; 11. Limiting step; 20. Sun gear; 30. Second bearing; 31. Inner ring body; 32. Rolling element. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Figure 1 This is a schematic diagram of a compact planetary structure according to the present invention. Figure 2 This is a schematic diagram of the structure of the first bearing of a compact planetary structure according to this utility model, as shown below. Figure 1-2 As shown, a preferred embodiment of a compact planetary structure is illustrated, comprising: a planetary gear 2 and a planetary shaft 1. The planetary gear 2 is rotatably disposed outside the planetary shaft 1 via at least one first bearing 3. The first bearing 3 includes: an inner ring body 31, which is coaxially sleeved outside the planetary shaft 1. The outer wall of the inner ring body 31 is provided with at least one raceway, and a plurality of rolling elements 32 roll within the raceway, with each rolling element 32 contacting the inner wall of the planetary gear 2.

[0030] In this application, by directly incorporating the inner wall of the planetary gear 2 as part of the outer ring of the first bearing 3, the independent outer ring of the traditional bearing is eliminated, effectively reducing the radial dimension and making the planetary structure more compact. This makes it suitable for scenarios with stringent space requirements. At the same time, this design simplifies the bearing structure and reduces the difficulty and cost of processing.

[0031] Furthermore, in a preferred embodiment, two first bearings 3 are provided. Two washers 5 and a retaining ring 4 are coaxially disposed between the two first bearings 3. The two washers 5 are respectively located in limiting contact with the rolling elements 32 of the two first bearings 3. The retaining ring 4 is disposed between the two washers 5 and coaxially engaged with the inner wall of the planetary gear 2. Using two first bearings 3 in conjunction with two washers 5 and a retaining ring 4 for axial positioning avoids additional complex positioning components, simplifies the assembly process, and improves assembly efficiency. At the same time, this axial positioning method can ensure the stable installation of the bearings within the planetary gear 2 and guarantee the normal rotation of the planetary gear 2.

[0032] Furthermore, as a preferred embodiment, the inner wall of the planetary gear 2 is coaxially provided with a groove, and the retaining ring 4 is engaged in the groove. Providing a groove on the inner wall of the planetary gear 2 to fix the retaining ring 4 makes the installation of the retaining ring 4 more secure and reliable, preventing it from loosening or shifting during operation, further enhancing the stability of axial positioning and improving the reliability of the entire planetary structure.

[0033] Furthermore, as a preferred embodiment, the planetary structure further includes: an internal gear ring 6, two flanges 7, and a planet carrier 10. The internal gear ring 6 meshes with the planet gears 2. The two flanges 7 are respectively installed at the two open ends of the internal gear ring 6, forming a cavity between them. The planet carrier 10 is disposed within the cavity and is coaxially rotatably positioned between the two flanges 7, with the planet shaft 1 fixed on the planet carrier 10. The meshing of the internal gear ring 6 with the planet gears 2 enables power transmission. The cavity formed by the two flanges 7 and the internal gear ring 6 provides installation space for the planet carrier 10. The planet carrier 10 serves as the carrier for the planet gears 2. This structural layout is reasonable, ensuring the stable operation of the planet gear 2 system while facilitating the assembly and installation of the entire planetary structure.

[0034] Furthermore, in a preferred embodiment, a limiting step 11 is formed at one end of the planetary shaft 1. The limiting step 11 limits one side of the inner ring body 31. A spacer 8 is also fitted on the outside of the planetary shaft 1, and the other side of the inner ring body 31 is limited and engaged with the planet carrier 10 through the spacer 8. The limiting step 11 and the spacer 8 at one end of the planetary shaft 1 together axially limit the inner ring body 31 of the first bearing 3, which can accurately control the axial position of the first bearing 3 on the planetary shaft 1, ensure the relative positional accuracy between the planetary gear 2 and the planetary shaft 1, and thus improve the smoothness and accuracy of the transmission.

[0035] Furthermore, as a preferred embodiment, the planetary carrier 10 is provided with a positioning groove, and the spacer 8 is positioned within the positioning groove. Providing a positioning groove on the planetary carrier 10 to position the spacer 8 allows for more accurate and stable installation of the spacer 8, preventing it from moving during operation. This further ensures the reliability of the axial positioning of the inner ring 31 of the first bearing 3 and improves the performance of the entire planetary structure.

[0036] Furthermore, as a preferred embodiment, the planetary shaft 1 is fixed to the planet carrier 10 by bolts 9. Using bolts 9 to fix the planetary shaft 1 to the planet carrier 10 is a simple and reliable connection method, facilitating installation and disassembly. When maintenance or replacement of the planetary gear 2 assembly is required, quick disassembly is possible, improving maintenance convenience.

[0037] Furthermore, as a preferred embodiment, a second bearing 30 is provided between the planetary carrier 10 and each flange 7. The second bearing 30 between the planetary carrier 10 and the flange 7 supports the relative rotation of the planetary carrier 10 and the flange 7, bears radial loads, reduces frictional loss, improves transmission efficiency, and ensures stable operation of the planetary carrier 10.

[0038] Furthermore, as a preferred embodiment, a sun shaft rotates coaxially on the planet carrier 10, and a sun gear 20 is sleeved on the outside of the sun shaft, meshing with planet gears 2. The meshing of the sun gear 20 and planet gears 2 realizes the input and output of power. This planetary transmission method has the advantages of large transmission ratio and strong load-bearing capacity, and can meet the power transmission requirements under different working conditions.

[0039] Furthermore, as a preferred embodiment, a third bearing is provided between the sun shaft and the planetary carrier 10. The third bearing supports the coaxial rotation of the sun shaft and the planetary carrier 10, ensuring the stability of the input shaft, reducing radial off-center load, reducing frictional loss, further improving transmission efficiency, and ensuring the normal operation of the entire planetary structure.

[0040] The specific installation steps for a compact planetary structure are as follows:

[0041] I. Installation of the 20-element sun gear

[0042] S1: Fit the third bearing onto the end of the sun shaft, ensuring that the third bearing is properly installed and can rotate freely;

[0043] S2: The sun shaft with the third bearing is installed into the center hole of the planet carrier 10 to ensure the coaxiality of the sun shaft and the planet carrier 10.

[0044] II. Pre-assembly of Planetary Gear 2 Components

[0045] S3: Sequentially install a single first bearing 3, washer 5, retaining ring 4, another washer 5, and another first bearing 3 into the inner hole of planetary gear 2. During the installation process, ensure that the position of each component is accurate. In particular, the retaining ring 4 should be inserted into the groove on the inner wall of planetary gear 2 to form an axial positioning structure of "bearing-washer 5-retaining ring".

[0046] III. Connection between planetary gear 2 and planet carrier 10

[0047] S4: Install the spacer 8 into the positioning groove on the planetary carrier 10, so that the spacer 8 is between the planetary carrier 10 and the first bearing 3, which serves as an axial limit.

[0048] S5: The pre-assembled planetary gear 2 is fitted onto the planetary shaft 1 through the inner ring of the first bearing 3 to ensure that the planetary gear 2 can rotate freely around the planetary shaft 1;

[0049] S6: Use bolts 9 to fix planetary shaft 1 to planetary carrier 10. The tightening torque of bolts 9 must meet the design requirements to ensure a firm and reliable connection.

[0050] IV. Axial clearance adjustment

[0051] S7: By increasing or decreasing the thickness of the axial washer 5 or adjusting the position of the spacer 8, the axial clearance can be made to meet the design requirements (e.g., Figure 1 The clearance shown is 0.35mm, to ensure the smoothness and accuracy of the planetary gear 2 transmission;

[0052] V. Installation of internal gear ring 6 and flange 7

[0053] S8: Engage the internal gear ring 6 (serial number 5) with the planetary gear 2 to ensure good engagement and no jamming.

[0054] S9: Install the second bearing 30 (serial number 2) between the planetary carrier 10 and the flange 7 (serial number 3) to ensure that the second bearing 30 is installed correctly and can rotate normally;

[0055] S10: Install the flanges 7 on both sides of the inner gear ring 6 at the two open ends respectively, and use bolts 9 and nuts to fix the flanges 7 to the inner gear ring 6 to form a complete closed ring structure. At the same time, fix the entire planetary structure to the outer shell or frame.

[0056] VI. Overall Inspection and Debugging

[0057] S11: After installation, conduct a comprehensive inspection of the compact planetary structure to check whether the installation of each component is secure and whether there is any looseness or abnormality.

[0058] S13: Conduct a no-load test run to observe whether the rotation of planetary gear 2 is smooth and whether there is any abnormal noise or vibration; if necessary, make further adjustments to the axial clearance, bearing preload, etc., to ensure that the planetary structure reaches the optimal working condition.

[0059] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A compact planetary structure, characterized in that, include: Planetary gears and a planetary shaft, wherein the planetary gears are rotatably disposed outside the planetary shaft via at least one first bearing, the first bearing comprising: The inner ring body is coaxially sleeved on the outside of the planetary shaft, and the outer wall of the inner ring body is provided with at least one raceway, in which a plurality of rolling elements roll, and each of the rolling elements is in contact with the inner wall of the planetary gear.

2. The compact planetary structure according to claim 1, characterized in that, Two first bearings are provided, and two washers and a retaining ring for the bore are coaxially arranged between the two first bearings. The two washers are respectively located in limiting contact with the rolling elements of the two first bearings. The retaining ring for the bore is arranged between the two washers and is coaxially engaged with the inner wall of the planetary gear.

3. The compact planetary structure according to claim 2, characterized in that, The inner wall of the planetary gear is provided with a groove on the same axis, and the hole is secured to the groove with a retaining ring.

4. The compact planetary structure according to claim 1, characterized in that, The planetary structure also includes: An internal gear ring, which meshes with the planetary gear; Two flanges are respectively installed at the two open ends of the internal gear ring, forming a cavity between them; A planetary carrier is disposed within the cavity and rotatably mounted coaxially between the two flanges, and the planetary shaft is fixed on the planetary carrier.

5. The compact planetary structure according to claim 4, characterized in that, One end of the planetary shaft forms a limiting step, which limits one side of the inner ring body. A spacer is also fitted on the outside of the planetary shaft, and the other side of the inner ring body is limited and engaged with the planet carrier through the spacer.

6. The compact planetary structure according to claim 5, characterized in that, The planetary carrier is provided with a positioning groove, and the spacer is positioned within the positioning groove.

7. The compact planetary structure according to claim 4, characterized in that, The planetary shaft is fixed to the planet carrier by bolts.

8. The compact planetary structure according to claim 4, characterized in that, A second bearing is provided between the planetary carrier and each of the flanges.

9. The compact planetary structure according to claim 4, characterized in that, A sun axis is coaxially rotated on the planet carrier, and a sun gear is fitted around the outside of the sun axis, which meshes with the planet gears.

10. The compact planetary structure according to claim 9, characterized in that, A third bearing is provided between the sun axis and the planet carrier.

Images