Planetary carrier and planetary reducer

Abstract

The utility model relates to the technical field of planetary gear structures, in particular to a planet carrier and a planetary reducer, which comprise a transmission side plate, a cover plate and a connecting pin shaft, the center of the transmission side plate is provided with a first center hole, and a plurality of pin holes are uniformly distributed on the transmission side plate along the periphery of the first center hole; the cover plate is connected to the transmission side plate through a connecting bolt, and a planetary gear mounting space is formed between the cover plate and the transmission side plate; the connecting pin shaft detachably penetrates through the pin hole, the end of the connecting pin shaft abuts against the cover plate, and the part, located between the cover plate and the transmission side plate, of the connecting pin shaft is used for being sleeved with the planetary gear. The planet carrier is of a structure integrating an integral planet carrier and an assembly type planet carrier, compared with the integral planet carrier, the planet carrier is low in machining difficulty and machining cost, high in machining efficiency and more suitable for the structure with the limited axial space, and compared with a common assembly type planet carrier, the planet carrier has the advantages that the machining cost is low, and the machining efficiency is high. The planet carrier is better in rigidity, better in supporting performance and small in overall deformation.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary gear structures, in particular to a planet carrier and a planetary reducer. Background Art

[0002] The planet carrier is one of the main components of planetary gear transmission. It is the part in the mechanism that bears the largest external torque. The planet wheel shafts or bearings are installed on the planet carrier. The structural form of the planet carrier depends to a large extent on the use function, the method of manufacturing the planet carrier, and the assembly conditions of the planetary gear reducer, etc. A reasonable planet carrier structure should have a small outer contour size, light weight, be able to ensure uniform load distribution among the planet wheels and uniform load distribution along the meshing tooth width, and have good machining and assembly processes, so that the planetary gear transmission has a high load-bearing capacity, less vibration and noise.

[0003] At present, the commonly used planet carrier structures mainly include integral planet carriers and assembled cantilever planet carriers. As the basic component of the planetary reducer, the integral planet carrier has high overall precision in actual processing, resulting in large processing difficulty, low processing efficiency, the need to manufacture molds in the manufacturing process, long production cycles, and because of its integral casting and processing, it requires a large installation space and is not suitable for structures with limited space; the assembled cantilever planet carrier has poor rigidity. When bearing a large radial force, the pin shafts are prone to deformation, resulting in gear wear or even damage. Summary of the Utility Model

[0004] The utility model provides a planet carrier and a planetary reducer to solve the defects that the existing integral planet carrier structure has large processing difficulty and the assembled cantilever planet carrier structure has poor rigidity.

[0005] The utility model provides a planet carrier, including a transmission side plate, a cover plate and a connecting pin shaft. A first central hole is arranged at the center of the transmission side plate, and a plurality of pin holes are evenly distributed along the outer circumference of the first central hole on the transmission side plate; the cover plate is connected to the transmission side plate through connecting bolts, and a planetary gear installation space is formed between the cover plate and the transmission side plate; the connecting pin shaft is detachably inserted into the pin holes, the end of the connecting pin shaft abuts against the cover plate, and the part of the connecting pin shaft located between the cover plate and the transmission side plate is used for sleeving the planetary gear.

[0006] According to the planet carrier provided by the utility model, the orifice of the pin hole far from the cover plate is constructed as a stepped orifice, a shaft shoulder is formed at one end of the connecting pin shaft far from the cover plate, and the shaft shoulder of the connecting pin shaft abuts against the stepped orifice of the pin hole.

[0007] According to the planet carrier provided by the utility model, the connecting pin shaft is inserted and fixed in the pin hole by means of interference fit.

[0008] According to a planet carrier provided by the present utility model, a second central hole is provided at the center of the cover plate, and a plurality of first bolt holes are evenly distributed along the outer periphery of the second central hole on the cover plate; second bolt holes are provided at positions corresponding to the first bolt holes on the transmission side plate, and the connecting bolts are inserted through the first bolt holes, and the ends of the connecting bolts are connected to the second bolt holes.

[0009] According to a planet carrier provided by the present utility model, a recessed area and a flat area located circumferentially of the recessed area are formed on the end face of the cover plate away from the transmission side plate, and the second central hole and the first bolt holes are both located in the recessed area, so that the bolt heads of the connecting bolts are flush with the flat area of the transmission side plate.

[0010] According to a planet carrier provided by the present utility model, a support bushing is sleeved on the outer periphery of the connecting bolt, and both ends of the support bushing are respectively abutted against the transmission side plate and the cover plate.

[0011] According to a planet carrier provided by the present utility model, the orifice of the first bolt hole near the transmission side plate and the orifice of the second bolt hole near the cover plate are both constructed as stepped orifices; both ends of the support bushing are respectively abutted against the stepped orifices of the first bolt hole and the second bolt hole.

[0012] According to a planet carrier provided by the present utility model, a needle roller bearing is sleeved on the connecting pin shaft, the planet gear is sleeved on the needle roller bearing, and gaskets are provided between the upper end face of the planet gear and the cover plate and between the lower end face of the planet gear and the transmission side plate.

[0013] According to a planet carrier provided by the present utility model, the end of the connecting pin shaft facing the cover plate is embedded in the cover plate.

[0014] The present utility model also provides a planetary reducer, including the planet carrier described in any one of the above.

[0015] For the planet carrier and the planetary reducer provided by the present utility model, the transmission function is mainly realized by the connecting pin shaft for assembling the planet gear on the planet carrier and the lower transmission side plate. The connecting pin shaft is detachably inserted through the pin hole of the transmission side plate, so that the connecting pin shaft and the transmission side plate can be separately processed, and after the processing is completed, they are assembled and connected. The cover plate is connected to the transmission side plate through connecting bolts and is assembled above the transmission side plate. The planet carrier of the present utility model is a structure that combines an integral planet carrier and an assembled planet carrier. Compared with the integral planet carrier, the planet carrier of the present utility model has lower processing difficulty and processing cost, higher processing efficiency, and is more suitable for structures with limited axial space. Compared with a general assembled planet carrier, the planet carrier of the present utility model has better rigidity, better support, and less overall deformation. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the attached drawings required for use in the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0017] Figure 1 It is a schematic three-dimensional structure diagram of the planet carrier provided by the present utility model.

[0018] Figure 2 It is a top view of the planet carrier provided by the present utility model.

[0019] Figure 3 is Figure 2 A - A cross-sectional view of

[0020] Reference numerals: 1, transmission side plate; 11, first central hole; 12, pin hole; 13, second bolt hole; 2, cover plate; 21, second central hole; 22, first bolt hole; 3, connecting bolt; 4, connecting pin shaft; 5, support bushing; 6, needle roller bearing; 7, gasket. Specific embodiments

[0021] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the attached drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model fall within the scope of protection of the present utility model.

[0022] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the attached drawings. It is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present utility model.

[0023] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0024] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0025] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0026] The following Figures 1 to 3 describes the specific structures of the planet carrier and the planetary reducer of the present utility model.

[0027] An embodiment of the present utility model provides a planet carrier. Referring to Figure 1 as shown, it includes a transmission side plate 1, a cover plate 2, and a connecting pin shaft 4. A first central hole 11 is provided at the center of the transmission side plate 1, and a plurality of pin holes 12 are evenly distributed along the outer circumference of the first central hole 11 on the transmission side plate 1; the cover plate 2 is connected to the transmission side plate 1 through a connecting bolt 3, and a planetary gear installation space is formed between the cover plate 2 and the transmission side plate 1; the connecting pin shaft 4 is detachably inserted through the pin hole 12, the end of the connecting pin shaft 4 abuts against the cover plate 2, and the part of the connecting pin shaft 4 located between the cover plate 2 and the transmission side plate 1 is used for sleeving the planetary gear.

[0028] Combined with Figure 2 and Figure 3As shown, it can be understood that for the planet carrier of this embodiment, its transmission function is mainly realized by the connecting pin shaft 4 for assembling the planet gears on the planet carrier and the transmission side plate 1 at the lower part. The connecting pin shaft 4 is detachably inserted through the pin hole 12 of the transmission side plate 1. Then, the connecting pin shaft 4 and the transmission side plate 1 can be processed separately and assembled and connected after processing. The cover plate 2 is connected to the transmission side plate 1 through the connecting bolts 3 and is assembled above the transmission side plate 1. The planet carrier of this embodiment has a structure that combines an integral planet carrier and an assembled planet carrier. Compared with the integral planet carrier, the planet carrier of this embodiment has lower processing difficulty and cost, higher processing efficiency, and is more suitable for structures with limited axial space. Compared with a general assembled planet carrier, the planet carrier of this embodiment has better rigidity, better support, and less overall deformation.

[0029] In some embodiments of the planet carrier of the present utility model, the orifice of the pin hole 12 away from the cover plate 2 is constructed as a stepped orifice, and the end of the connecting pin shaft 4 away from the cover plate 2 is formed with a shaft shoulder, and the shaft shoulder of the connecting pin shaft 4 abuts against the stepped orifice of the pin hole 12.

[0030] It can be understood that in the structure of the planet carrier of this embodiment, the connecting pin shaft 4 passes through the pin hole 12 from below the transmission side plate 1, and the shaft shoulder at the lower end of the connecting pin shaft 4 finally abuts in the stepped orifice of the pin hole 12 to realize the axial positioning of the connecting pin shaft 4. Further, in some examples, the connecting pin shaft 4 is inserted and fixed in the pin hole 12 by an interference fit method, and the overall assembly of the connecting pin shaft 4 and the transmission side plate 1 is realized by a small interference method. Figure 1 and Figure 3 As shown, the connecting pin shaft 4 and the transmission side plate 1 can be processed separately, and the processing difficulty is lower compared with integral processing. After processing, an interference fit assembly connection is adopted to form an overall assembly with better rigidity, which can bear a large radial force during operation, and the connecting pin shaft 4 is not easily deformed, ensuring the normal meshing operation of the planet gears.

[0031] In some other embodiments of the planet carrier of the present utility model, a second central hole 21 is provided at the center of the cover plate 2, and a plurality of first bolt holes 22 are evenly distributed along the outer periphery of the second central hole 21 on the cover plate 2; second bolt holes 13 are provided at positions corresponding to the first bolt holes 22 on the transmission side plate 1, and the connecting bolts 3 are inserted through the first bolt holes 22, and the ends of the connecting bolts 3 are connected to the second bolt holes 13.

[0032] As shown in Figure 2 and Figure 3 , it can be understood that the cover plate 2 is positioned by four connecting pin shafts 4, assembled above the transmission side plate 1, and the connection between the cover plate 2 and the transmission side plate 1 is realized by four connecting bolts 3. The cover plate 2 realizes the axial limit of the ends of the four connecting pin shafts 4.

[0033] Further, in some specific examples of the planet carrier of the present utility model, referring again to Figure 1 As shown, a recessed area and a planar area circumferentially located in the recessed area are formed on the end face of the cover plate 2 away from the transmission side plate 1. The second central hole 21 and the first bolt hole 22 are both located in the recessed area, so that the bolt head of the connecting bolt 3 is flush with the planar area of the transmission side plate 1. It can be understood that in the structure of the planet carrier in this example, after connecting the cover plate 2 and the transmission side plate 1 through the connecting bolt 3, the bolt head of the connecting bolt 3 is located in the recessed area of the cover plate 2, and the upper surface of the bolt head is flush with the planar area of the cover plate 2. The structure is not only beautiful but also not likely to interfere with other structural parts.

[0034] On the basis of the above embodiments, in some other embodiments of the planet carrier of the present utility model, a support bushing 5 is sleeved on the outer periphery of the connecting bolt 3, and both ends of the support bushing 5 are respectively abutted against the transmission side plate 1 and the cover plate 2. It can be understood that the support bushing 5 is located between the transmission side plate 1 and the cover plate 2 and plays a supporting role. The connecting bolt 3 passes through the cover plate 2 and the support bushing 5 in sequence and is connected to the transmission side plate 1 to form a frame structure. Then, the connecting pin shaft 4 is inserted into the pin hole 12 on the transmission side plate 1, and the end of the connecting pin shaft 4 is abutted against the cover plate 2. During the process of inserting the connecting pin shaft 4, a planetary gear is sleeved on the connecting pin shaft 4 to complete the installation of the planetary gear on the planet carrier.

[0035] In some specific examples, referring again to Figure 3 As shown, the orifice of the first bolt hole 22 near the transmission side plate 1 and the orifice of the second bolt hole 13 near the cover plate 2 are both constructed as stepped orifices; both ends of the support bushing 5 are respectively abutted against the stepped orifices of the first bolt hole 22 and the second bolt hole 13. It can be understood that in this embodiment, both ends of the support bushing 5 are respectively placed in the stepped orifices of the first bolt hole 22 and the second bolt hole 13, so that the support bushing 5 forms mutual limitation with the transmission side plate 1 and the cover plate 2 in its radial direction. Referring to Figure 1 As shown, the support bushing 5 is composed of multiple ( Figure 1 in this case, four), and the multiple support bushings 5 are evenly distributed circumferentially. Then, under the radial limiting action of the support bushing 5, it can be ensured that the transmission side plate 1 and the cover plate 2 will not have relative radial displacement, protecting the connecting pin shaft 4 from excessive radial shear force and deformation; at the same time, the support bushing 5 also protects the connecting bolt 3 passing through its interior from excessive radial shear force. The connecting bolt 3 is used to connect the transmission side plate 1 and the cover plate 2, and the connecting pin shaft 4 is used to install the planetary gear. Through the setting of the support bushing 5 in this example, the support bushing 5 replaces the connecting bolt 3 and the connecting pin shaft 4 to bear the radial shear force to a certain extent, ensuring the normal operation of the connecting bolt 3 and the connecting pin shaft 4. The connecting pin shaft 4 is not easily deformed due to force, resulting in wear of the planetary gear, enhancing the rigidity of the overall structure and extending the service life.

[0036] In some embodiments of the planet carrier of the present utility model, referring again to Figure 3 As shown, a needle roller bearing 6 is sleeved on the connecting pin shaft 4, the planet gear is sleeved on the needle roller bearing 6, and gaskets 7 are provided between the upper end face of the planet gear and the cover plate 2 and between the lower end face of the planet gear and the transmission side plate 1. Further, the end of the connecting pin shaft 4 facing the cover plate 2 is embedded in the cover plate 2.

[0037] It can be understood that, first, according to the torque calculation, a suitable interference amount is selected, a plurality of pin holes 12 with appropriate sizes are machined on the transmission side plate 1, and a stepped hole is machined at one end of the pin hole 12. At the same time, a plurality of second bolt holes 13 are machined on the transmission side plate 1. The connecting bolts 3 are sequentially passed through the first bolt holes 22 of the cover plate 2 and the support bush 5 and connected to the second bolt holes 13 on the transmission side plate 1. The support bush 5 supports the transmission side plate 1 and the cover plate 2 to form the overall structural framework of the planet carrier. A shoulder is machined at one end of the connecting pin shaft 4, and the connecting pin shaft 4 is inserted into the pin hole 12 along the pin hole 12, so that the shoulder of the connecting pin shaft 4 cooperates with the stepped hole of the pin hole 12 to form the axial limit at one end of the connecting pin shaft 4. During this process, a needle roller bearing 6, a gasket 7 and a planet gear are sleeved on the part of the connecting pin shaft 4 located between the cover plate 2 and the transmission side plate 1. Finally, the end of the connecting pin shaft 4 facing the cover plate 2 is embedded in the cover plate 2, and the connecting pin shaft 4 and the pin hole 12 are in interference fit. The cover plate 2 acts as the axial limit for the other end of the connecting pin shaft 4, completing the assembly of the planet carrier and the installation of the planet gear on the planet carrier.

[0038] It should be understood that in the structure of the planet carrier of the present utility model, the connecting pin shaft 4 and the transmission side plate 1 can be separately machined and then assembled and connected after machining. Compared with the integral planet carrier, the planet carrier of the present utility model has lower machining difficulty and machining cost, higher machining efficiency, and is more suitable for structures with limited axial space. The overall frame structure assembled by the transmission side plate 1, the cover plate 2 and the support bush 5 has better rigidity, better support performance and less overall deformation compared with the general assembled planet carrier.

[0039] On the other hand, the present utility model also provides a planetary reducer, including the planet carrier of any one of the above embodiments. It can be understood that since the planetary reducer of the present utility model includes the structure of the planet carrier of the above embodiments, the planetary reducer has all the advantages of the above planet carrier, making the planetary reducer not only have low machining cost, but also good rigidity and strong support performance.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A planet carrier, characterized in that, Comprising: A transmission side plate (1), a first central hole (11) is provided at the center of the transmission side plate (1), and a plurality of pin holes (12) are evenly distributed along the outer circumference of the first central hole (11) on the transmission side plate (1); A cover plate (2), the cover plate (2) is connected to the transmission side plate (1) by a connecting bolt (3), and a planetary gear installation space is formed between the cover plate (2) and the transmission side plate (1); A connecting pin shaft (4), the connecting pin shaft (4) is detachably inserted into the pin hole (12), the end of the connecting pin shaft (4) abuts against the cover plate (2), and the portion of the connecting pin shaft (4) located between the cover plate (2) and the transmission side plate (1) is used for sleeving a planetary gear.

2. The planet carrier according to claim 1, characterized in that, The orifice of the pin hole (12) away from the cover plate (2) is constructed as a stepped orifice, one end of the connecting pin shaft (4) away from the cover plate (2) is formed with a shaft shoulder, and the shaft shoulder of the connecting pin shaft (4) abuts against the stepped orifice of the pin hole (12).

3. The planet carrier according to claim 1, characterized in that, The connecting pin shaft (4) is inserted and fixed in the pin hole (12) by an interference fit.

4. The planet carrier according to any one of claims 1 to 3, characterized in that A second central hole (21) is provided at the center of the cover plate (2), and a plurality of first bolt holes (22) are evenly distributed along the outer circumference of the second central hole (21) on the cover plate (2); second bolt holes (13) are provided at positions corresponding to the first bolt holes (22) on the transmission side plate (1), the connecting bolt (3) is inserted into the first bolt hole (22), and the end of the connecting bolt (3) is connected to the second bolt hole (13).

5. The planet carrier according to claim 4, characterized in that, A recessed area and a flat area circumferentially located in the recessed area are formed on the end surface of the cover plate (2) away from the transmission side plate (1), and the second central hole (21) and the first bolt holes (22) are both located in the recessed area, so that the bolt head of the connecting bolt (3) is flush with the flat area of the transmission side plate (1).

6. The planet carrier according to claim 4, characterized in that A support bushing (5) is sleeved on the outer circumference of the connecting bolt (3), and the two ends of the support bushing (5) respectively abut against the transmission side plate (1) and the cover plate (2).

7. The planet carrier according to claim 6, characterized in that, The orifice of the first bolt hole (22) near the transmission side plate (1) and the orifice of the second bolt hole (13) near the cover plate (2) are both constructed as stepped orifices; the two ends of the support bushing (5) respectively abut against the stepped orifices of the first bolt hole (22) and the second bolt hole (13).

8. The planet carrier according to any one of claims 1 to 3, characterized in that, A needle roller bearing (6) is sleeved on the connecting pin shaft (4), the planetary gear is sleeved on the needle roller bearing (6), and gaskets (7) are provided between the upper end surface of the planetary gear and the cover plate (2) and between the lower end surface of the planetary gear and the transmission side plate (1).

9. The planet carrier according to claim 8, characterized in that, The end of the connecting pin shaft (4) facing the cover plate (2) is embedded in the cover plate (2).

10. A planetary speed reducer, characterized in that, Including the planet carrier according to any one of claims 1 to 9.

Images