Method for assembling a planet carrier of a bearing-in-rolling-element arrangement

Abstract

The application discloses an assembly method of an inner bearing structure planetary carrier, and an assembly tool for the inner bearing structure planetary carrier, which comprises a ring-shaped tool, a lifting ring and a hydraulic device, screw holes are symmetrically arranged on the upper end face of the ring-shaped tool, the lifting ring is installed between the ring-shaped tools and is threadedly engaged through the screw holes, the hydraulic device is communicated with a pressing hole and is used for providing hydraulic pressure to the pressing hole, and the inner bearing installation groove is supported by the ring-shaped tool during the installation of the inner bearing structure planetary carrier, so that the phenomenon that the inner bearing installation position of the planetary carrier is tapered, concave-convex or the inner hole diameter is increased is effectively avoided, the assembly of the inner bearing and the use reliability of the inner bearing are effectively ensured, and the service life of the inner bearing is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of planetary carrier assembly technology, and particularly relates to an assembly method for a planetary carrier with an internal bearing structure. Background Technology

[0002] The planetary carrier with an internal bearing structure is one of the key components in a planetary gearbox. Its design and function are crucial to the transmission system of the planetary reducer. During the assembly of the planetary carrier, since the planetary gear shafts are assembled around the planetary carrier, while the internal bearings are assembled in the middle of the planetary carrier, the planetary carrier is subjected to compressive forces after the planetary gear shafts are assembled. This can easily cause the internal bearing mounting position to develop taper, uneven surfaces, or an enlarged inner diameter. This not only affects the assembly of the internal bearings but also seriously affects the reliability of their use. Summary of the Invention

[0003] To at least partially solve the technical problems existing in the prior art, the present invention provides an assembly method for a planetary carrier with an internal bearing structure.

[0004] The planetary carrier with an internal bearing structure of the present invention includes a planetary carrier, an external bearing, a first spacer ring, a planetary gear assembly, and an internal bearing. The external bearing is fitted onto the planetary carrier at a fixed distance via the first spacer ring. The planetary carrier has multiple openings, and the planetary gear assembly is installed within the openings. A mounting groove is provided in the middle of the planetary carrier, and the internal bearing is nested within the mounting groove. Pressure holes are symmetrically arranged on both sides of the planetary carrier near the mounting groove. Two oil holes are provided penetrating between the bottom of the pressure holes and the mounting groove. The planetary gear assembly includes a planetary gear shaft, a second spacer ring, a planetary gear bearing, planetary gears, and an adjusting ring. The planetary gears are mounted on the planetary gear bearings. One end of the planetary gear bearing is connected to the opening via the second spacer ring, and the other end is connected to the opening via the adjusting ring. The planetary carrier has a planetary bore through the opening. The planetary gear shaft passes through the planetary bore and the planetary gear bearing in sequence, and the planetary gear shaft is transition-fitted with the planetary bore and the planetary gear bearing.

[0005] The assembly fixture for planetary carriers with internal bearing structures of the present invention includes a ring fixture, a lifting ring, and a hydraulic device. The upper end face of the ring fixture is symmetrically provided with threaded holes. The lifting ring is installed between the ring fixtures and engages with the threaded holes. The hydraulic device is connected to a pressure hole and is used to provide hydraulic pressure to the pressure hole.

[0006] Furthermore, in the aforementioned assembly fixture for planetary carriers with internal bearing structures, the outer diameter of the annular fixture is 0.05 mm larger than the diameter of the mounting groove.

[0007] Furthermore, in the aforementioned assembly fixture for planetary carriers with internal bearing structures, the annular fixture has two annular grooves in the circumferential direction, with the middle of the two annular grooves corresponding to two oil holes.

[0008] The assembly method of the planetary carrier with internal bearing structure of the present invention includes: The first spacer ring is assembled on the planetary carrier with the spline side facing upward. At the same time, the external bearing is heated and assembled onto the planetary carrier. After cooling to room temperature, the planetary carrier is rotated 90°. After installing the planetary gears on the planetary gear bearings, the planetary gear bearings are assembled into the opening of the planetary carrier using the second spacer ring and the adjusting ring, and the planetary gear bearings are made coaxial with the planetary bores. The planetary carrier, which is equipped with planetary bearings and planetary gears, is heated so that the annular tooling is nested in the mounting groove; Meanwhile, the planetary gear shaft is cooled, and after the annular tooling is installed, the planetary gear shaft is assembled into the planetary bore. After the assembled planetary carrier has returned to normal room temperature, the ring tooling is pressurized by a hydraulic device and then removed by a lifting ring. After the annular fixture is removed, the inner bearing is installed in the mounting slot.

[0009] Furthermore, in the above-mentioned assembly method of the planetary carrier with internal bearing structure, the heating temperature of the external bearing is 90°C.

[0010] Furthermore, in the above-mentioned assembly method of the planetary carrier with internal bearing structure, the heating temperature of the planetary carrier equipped with planetary bearings and planetary gears is 60°C.

[0011] Furthermore, in the above-mentioned assembly method of the planetary carrier with internal bearing structure, the cooling temperature of the planetary gear shaft is -70℃.

[0012] The assembly method of the planetary carrier with internal bearing structure of the present invention has the following advantages and beneficial effects: This invention effectively avoids the phenomena of taper, uneven surface, or enlarged inner diameter at the installation position of the planetary carrier internal bearing, effectively ensuring the assembly reliability of the internal shaft and the reliability of the internal bearing, and improving the service life of the internal bearing. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1This is a schematic diagram of the planetary carrier with an internal bearing structure according to the present invention; Figure 2 for Figure 1 A magnified structural diagram of A in the middle; Figure 3 This is a schematic diagram of the annular tooling structure of the planetary carrier assembly tooling for internal bearing structure of the present invention. Figure 4 This is a schematic diagram of the planetary carrier with an internal bearing structure of the present invention being assembled using assembly tooling. Figure 5 This is a schematic diagram of the tooling for removing the planetary carrier of the internal bearing structure of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1: Planetary carrier; 11: Opening; 12: Mounting slot; 13: Pressure test hole; 14: Oil hole; 15: Planetary hole; 2: External bearing; 3: First spacer ring; 4: Planetary gear assembly; 41: Planetary gear shaft; 42: Second spacer ring; 43: Planetary gear bearing; 44: Planetary gear; 45: Adjusting ring; 5: Internal bearing; 6: Annular tooling; 61: Threaded hole; 62: Annular groove; 7: Lifting ring; 8: Hydraulic device. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0016] like Figures 1 to 2 As shown, the planetary carrier with an internal bearing structure of the present invention includes a planetary carrier 1, an external bearing 2, a first spacer ring 3, a planetary gear assembly 4, and an internal bearing 5. The external bearing 2 is fixedly sleeved onto the planetary carrier 1 via the first spacer ring 3. The planetary carrier 1 is provided with multiple openings 11, and the planetary gear assembly 4 is installed in the openings 11. The planetary carrier 1 is provided with a mounting groove 12 in the middle, and the internal bearing 5 is nested in the mounting groove 12. The planetary carrier 1 is symmetrically provided with pressure holes 13 on both sides near the mounting groove 12. Two oil holes 14 are provided through the bottom of the pressure holes 13 and the mounting groove 12, wherein: The planetary gear assembly 4 includes a planetary gear shaft 41, a second spacer ring 42, a planetary gear bearing 43, a planetary gear 44, and an adjusting ring 45. The planetary gear 44 is mounted on the planetary gear bearing 43. One end of the planetary gear bearing 43 is connected to the opening 11 via the second spacer ring 42 and the other end is connected to the opening 11 via the adjusting ring 45. The planetary carrier 1 passes through the opening 11 and is provided with a planetary hole 15. The planetary gear shaft 41 passes through the planetary hole 15 and the planetary gear bearing 43 in sequence, and the planetary gear shaft 41 is transitionally fitted with the planetary hole 15 and the planetary gear bearing 43.

[0017] like Figure 3 The assembly fixture for planetary carriers with internal bearing structures shown in the present invention includes an annular fixture 6, a lifting ring 7, and a hydraulic device 8. The upper end face of the annular fixture 6 is symmetrically provided with threaded holes 61. The lifting ring 7 is installed between the annular fixtures 6 and is threadedly engaged through the threaded holes 61. The hydraulic device 8 is connected to the pressure hole 13 and is used to provide hydraulic pressure to the pressure hole 13.

[0018] Furthermore, in the assembly fixture for the planetary carrier of the internal bearing structure of the present invention, the outer diameter of the annular fixture 6 is 0.05 mm larger than the diameter of the mounting groove 12, thereby effectively ensuring the support of the annular fixture 6 for the mounting groove 12 and avoiding the phenomenon of tapering, uneven surface and enlargement of the inner diameter of the mounting groove 12 when installing the planetary gear shaft 41.

[0019] Furthermore, in the assembly fixture for planetary carriers with internal bearing structures of the present invention, the annular fixture 6 is provided with two annular grooves 62 in the circumferential direction, and the middle of the two annular grooves 62 corresponds to two oil holes 14, thereby facilitating the removal of the annular fixture 6.

[0020] like Figures 4 to 5 As shown, the assembly method of the planetary carrier with internal bearing structure of the present invention includes: The first spacer ring 3 is assembled on the planetary carrier 1 with the spline side facing upward. At the same time, the external bearing 2 is heated to 90° and assembled on the planetary carrier 1. After cooling to room temperature, the planetary carrier 1 is rotated 90°. After the planetary gear 44 is installed on the planetary gear bearing 43, the planetary gear bearing 43 is assembled at the opening 11 of the planetary carrier 1 by the second spacer ring 42 and the adjusting ring 45, and the planetary gear bearing 43 is made coaxial with the planetary hole 15. The planet carrier 1, which is equipped with planetary gear bearing 43 and planetary gear 44, is heated to 60°C so that the annular tooling 6 is nested in the mounting groove 12. Meanwhile, the planetary gear shaft 41 is cooled to -70°C. After the annular tooling 6 is installed, the planetary gear shaft 41 is then assembled into the planetary bore 15. After the assembled planetary carrier 1 returns to normal room temperature, the hydraulic oil pipe of the hydraulic device 8 is connected to the pressure hole 13, and hydraulic oil is input into the pressure hole 13. During this process, the hydraulic oil fills the space between the mounting groove 12 and the annular groove 62 through the two oil holes 14. During the pressure test, the tooling is removed by lifting equipment through the lifting ring 7. After the annular fixture 6 is removed, the inner bearing is installed in the mounting groove 12.

[0021] In summary, compared with the prior art, the assembly method of the planetary carrier with internal bearing structure of the present invention has the following advantages and beneficial effects: the present invention effectively avoids the phenomenon of taper, concave and convex surfaces or enlarged inner diameter at the installation position of the internal bearing of the planetary carrier, effectively ensures the assembly of the internal shaft and the reliability of the use of the internal bearing, and improves the service life of the internal bearing.

[0022] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assembling a planetary carrier with an internal bearing structure, characterized in that, The assembly method of the planetary carrier with an internal bearing structure is implemented using assembly fixtures for the planetary carrier with an internal bearing structure. The planetary carrier with an internal bearing structure includes a planetary carrier, an external bearing, a first spacer ring, a planetary gear assembly, and an internal bearing. The external bearing is fitted onto the planetary carrier at a fixed distance via the first spacer ring. The planetary carrier has multiple openings, and the planetary gear assembly is installed in the openings. A mounting groove is provided in the middle of the planetary carrier, and the internal bearing is nested in the mounting groove. The planetary carrier has symmetrically arranged pressure holes on both sides near the mounting groove. Two oil holes are provided through the bottom of the pressure holes and the mounting groove, wherein: The planetary gear assembly includes a planetary gear shaft, a second spacer ring, a planetary gear bearing, planetary gears, and an adjusting ring. The planetary gears are mounted on the planetary gear bearings. One end of the planetary gear bearing is connected to the opening via the second spacer ring, and the other end is connected to the opening via the adjusting ring. The planetary carrier has a planetary hole through the opening. The planetary gear shaft passes through the planetary hole and the planetary gear bearing in sequence, and the planetary gear shaft is transition-fitted with the planetary hole and the planetary gear bearing. The assembly fixture for the planetary carrier with internal bearing structure includes a ring fixture, a lifting ring, and a hydraulic device. The upper end face of the ring fixture is symmetrically provided with threaded holes. The lifting ring is installed between the ring fixtures and engages with the threads through the threaded holes. The hydraulic device is connected to the pressure hole and is used to provide hydraulic pressure to the pressure hole. The outer diameter of the annular tooling is 0.05 mm larger than the diameter of the mounting groove; The annular tooling has two annular grooves along its circumference, with the middle of each groove corresponding to one of the two oil holes. The assembly method of the planetary carrier with internal bearing structure includes: The first spacer ring is assembled on the planetary carrier with the spline side facing upward. At the same time, the external bearing is heated and assembled onto the planetary carrier. After cooling to room temperature, the planetary carrier is rotated 90°. After installing the planetary gears on the planetary gear bearings, the planetary gear bearings are assembled into the opening of the planetary carrier using the second spacer ring and the adjusting ring, and the planetary gear bearings are made coaxial with the planetary bores. The planetary carrier, which is equipped with planetary bearings and planetary gears, is heated so that the annular tooling is nested in the mounting groove; Meanwhile, the planetary gear shaft is cooled, and after the annular tooling is installed, the planetary gear shaft is assembled into the planetary bore. After the assembled planetary carrier has returned to normal room temperature, the ring tooling is pressurized by a hydraulic device and then removed by a lifting ring. After the annular fixture is removed, the inner bearing is installed in the mounting slot.

2. The assembly method of the planetary carrier with internal bearing structure according to claim 1, characterized in that, The heating temperature of the external bearing is 90℃.

3. The assembly method of the planetary carrier with internal bearing structure according to claim 1, characterized in that, The planetary carrier, equipped with planetary bearings and planetary gears, is heated to 60°C.

4. The assembly method of the planetary carrier with internal bearing structure according to claim 1, characterized in that, The planetary gear shaft has a cooling temperature of -70℃.

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