A modular two-stage planetary gear reducer

Abstract

The utility model relates to the technical field of reducers, and specifically to a modular two-stage planetary gear reduction box, including a box body and a transmission assembly, wherein the transmission assembly is arranged in the box body, and the transmission assembly includes a primary reduction module, a planetary gear ring, a plurality of secondary planetary wheels, a secondary planet carrier, a secondary sun gear shaft and an output disc, wherein the primary reduction module is axially connected to the secondary sun gear shaft, and the primary reduction module is radially meshed with the planetary gear ring, and the output disc includes an output end and a mounting end, and the mounting end is connected to the planetary gear ring through a connecting bearing, and a secondary sun gear shaft is arranged at a central position enclosed and formed by a plurality of secondary planetary wheels, and each secondary planetary wheel is meshed with the planetary gear ring and the secondary sun gear shaft, and the secondary planet carrier is fixed at the mounting end and limits the secondary planetary wheels, and the secondary planet carrier is reserved with a through hole for the secondary sun gear shaft to penetrate. The primary reduction module is integratedly designed, so as to reduce the number of components of the reduction box as a whole and improve the assembly and installation efficiency of the reduction box.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a modular two-stage planetary gear reducer. Background Art

[0002] Planetary reducer is a reducer with three planetary gears rotating around a sun gear. With the rapid development of the planetary reducer industry, more and more industries and different companies have applied planetary reducers. The main products are planetary gear reducers; helical gear-spiral bevel gear reducers; spiral bevel gear steering boxes; hardened helical gear reducers; parallel shaft helical gear reducers; helical gear-worm reducers; hardened industrial gearboxes; continuously variable speed machines; worm reducers and various series of non-standard reducers. It is suitable for industrial sectors such as lifting and transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light industry and textiles, medical equipment, instruments and meters, automobiles, ships, weapons and aerospace. This design is a modularly designed spur gear first-stage planetary reducer. The industrial robot joints require high precision and high torque density and power density. The planetary reducer can effectively meet the joint requirements of industrial robots.

[0003] The existing multi-stage reducer has many reducer parts and low assembly efficiency. Utility Model Content

[0004] The utility model aims to provide a modular two-stage planetary gear reducer to solve the above-mentioned problem of low assembly efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is to provide a modular two-stage planetary gear reduction box, including a box body and a transmission assembly, wherein the transmission assembly is arranged in the box body, and the transmission assembly includes a primary reduction module, a planetary gear ring, a plurality of secondary planetary gears, a secondary planet carrier, a secondary sun gear shaft and an output disc, wherein the axial direction of the primary reduction module is connected to the secondary sun gear shaft, and the radial direction of the primary reduction module is meshed with the planetary gear ring, and the output disc includes an output end and a mounting end, wherein the mounting end is connected to the planetary gear ring through a connecting bearing, and the mounting end is provided with a plurality of mounting seats, each of the secondary planetary gears is mounted on each of the mounting seats, and the secondary sun gear shaft is provided at the center position surrounded and formed by the plurality of secondary planetary gears, and each of the secondary planetary gears is meshed with the planetary gear ring and the secondary sun gear shaft, and the secondary planet carrier is fixed to the mounting end and defines the secondary planetary gears, and the secondary planet carrier is reserved with a through hole for the secondary sun gear shaft to penetrate.

[0006] Furthermore, a connecting hole is provided at the end of the first-stage reduction module, and the connecting hole is a waist-shaped hole or a square hole, and the end of the second-stage sun gear shaft is inserted into the connecting hole and matched therewith.

[0007] Furthermore, the mounting end is provided with a limiting groove, and the secondary planetary frame is provided with a limiting block, and the limiting block is embedded in the limiting groove and fixed by screws.

[0008] Furthermore, at least two groups of the limiting grooves and the limiting blocks are provided, and the secondary planet carrier is provided with an avoidance groove for the outer edge of the planetary wheel to pass through.

[0009] Furthermore, the box body includes a fixedly connected fixing seat and an end cover, one end of the fixing seat is open and the end of the first-stage reduction module is passed through, and one end of the end cover is open and the output disk is passed through.

[0010] Furthermore, the transmission assembly also includes a primary bearing, the primary bearing is sleeved on the primary reduction module, and the primary reduction module is rotatably connected to the fixed seat through the primary bearing.

[0011] Furthermore, the primary bearing is located between the reduction module and the fixing seat, and an end of the primary bearing is exposed from an opening of the fixing seat. The transmission assembly also includes a limit screw, and the limit screw abuts against an end of the primary bearing.

[0012] Furthermore, the limit screw includes an outer ring screw and an inner ring screw, the tail end of the outer ring screw is fixed on the fixing seat, and the cap end of the outer ring screw abuts the fixing seat and the primary bearing; the tail end of the inner ring screw is fixed on the primary reduction module, and the cap end of the inner ring screw abuts the primary reduction module and the primary bearing.

[0013] Furthermore, the connecting bearing is coaxially arranged with the primary bearing.

[0014] Furthermore, the connecting bearing adopts a cross roller bearing.

[0015] The beneficial effects of the utility model are:

[0016] 1. In this solution, the first-stage reduction module is designed to be integrated, which reduces the number of components of the overall reduction box, reduces the difficulty of assembling the reduction box, and improves the assembly efficiency of the reduction box.

[0017] 2. A connection hole is provided at the end of the primary reduction module, which is a waist-shaped hole or a square hole, and the end of the secondary sun gear shaft is plugged into the connection hole and matched with it. Through the setting of the waist-shaped hole or the square hole, when the primary reduction module rotates, the secondary sun gear shaft can be driven to rotate synchronously.

[0018] 3. A limit slot is provided at the installation end, and a limit block is provided on the secondary planetary frame. The limit block is embedded in the limit slot and fixed by screws. Through the cooperation of the limit slot and the limit block, the secondary planetary frame can limit the installation of the secondary planetary gear.

[0019] 4. The primary bearing is located between the reduction module and the fixed seat, and the end of the primary bearing is exposed from the opening of the fixed seat. The transmission assembly also includes a limit screw, and the limit screw abuts against the end of the primary bearing. By setting the limit screw, the installation position of the primary bearing is limited to prevent the primary bearing from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall structure of a modular two-stage planetary gear reducer provided by an embodiment of the utility model from a first perspective;

[0022] Figure 2 A schematic diagram of the overall structure of a modular two-stage planetary gear reducer provided by an embodiment of the utility model from a second perspective;

[0023] Figure 3 A cross-sectional view of a modular two-stage planetary gear reduction box provided in an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the overall structure of a first reduction module used in a modular two-stage planetary gear reduction box provided in an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of a partial explosion structure of a modular two-stage planetary gear reduction box provided in an embodiment of the utility model;

[0026] Figure 6 A schematic diagram of the overall exploded structure of a modular two-stage planetary gear reducer provided in an embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Housing; 11. Fixing seat; 12. End cover; 2. Transmission assembly; 21. Primary reduction module; 211. Connecting hole; 22. Output disc; 221. Output end; 222. Mounting end; 23. Planetary ring gear; 24. Secondary planetary gear; 25. Secondary planetary carrier; 251. Limit block; 252. Avoidance groove; 26. Secondary sun gear shaft; 27. Connecting bearing; 28. Primary bearing; 29. ​​Limit screw; 291. Outer ring screw; 292. Inner ring screw. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Reference Figures 1 to 6As a modular two-stage planetary gear reduction box provided by an embodiment of the utility model, it includes a box body 1 and a transmission assembly 2, the transmission assembly 2 is arranged in the box body 1, the transmission assembly 2 includes a primary reduction module 21, a planetary gear ring 23, a plurality of secondary planetary gears 24, a secondary planetary carrier 25, a secondary sun gear shaft 26 and an output disc 22, the primary reduction module 21 is axially connected to the secondary sun gear shaft 26, the primary reduction module 21 is radially meshed with the planetary gear ring 23, the output disc 22 includes an output end 221 and a mounting end 2 22, the mounting end 222 is connected to the planetary gear ring 23 through the connecting bearing 27, the mounting end 222 is provided with a plurality of mounting seats, each secondary planetary gear 24 is mounted on each mounting seat, and a secondary sun gear shaft 26 is provided at the center position enclosed and formed by the plurality of secondary planetary gears 24, and each secondary planetary gear 24 is meshed with the planetary gear ring 23 and the secondary sun gear shaft 26, the secondary planet carrier 25 is fixed to the mounting end 222 and limits the secondary planetary gear 24, and the secondary planet carrier 25 is reserved with a through hole for the secondary sun gear shaft 26 to penetrate. In this solution, the primary reduction module 21 is integratedly designed, which reduces the number of components of the overall reduction box, reduces the assembly difficulty of the reduction box, and improves the assembly and installation efficiency of the reduction box.

[0034] Specifically, the housing 1 includes a fixedly connected fixing seat 11 and an end cover 12. One end of the fixing seat 11 is open and the end of the primary reduction module 21 is passed through. One end of the end cover 12 is open and the output disc 22 is passed through. The primary reduction module 21 includes a planetary gear, a planetary carrier and a sun gear shaft. The three are integrated and modularized to form a standard integral accessory, which is convenient for direct installation to the reduction gear. The outer edge of the planetary gear must be ensured to be meshed with the planetary gear ring 23. A connecting hole 211 is provided at the end of the planetary carrier. The connecting hole 211 is a waist-shaped hole or a square hole. The end of the secondary sun gear shaft 26 is plugged into the connecting hole 211 and adapted thereto. Through the setting of the waist-shaped hole or the square hole, when the primary reduction module 21 rotates, the secondary sun gear shaft 26 can be driven to rotate synchronously.

[0035] Furthermore, the mounting end 222 is provided with a limiting groove, and the secondary planet carrier 25 is provided with a limiting block 251, which is embedded in the limiting groove and fixed by screws. Through the cooperation of the limiting groove and the limiting block 251, the secondary planet carrier 25 can limit the installation of the secondary planetary gear 24.

[0036] Specifically, at least two groups of limiting grooves and limiting blocks 251 are provided, and an avoidance groove 252 for the outer edge of the planetary gear to pass through is provided on the secondary planetary carrier 25. In this embodiment, there are three secondary planetary gears 24, and the center lines of the three secondary planetary gears 24 enclose an equilateral triangle, and the axis of the secondary sun gear shaft 26 passes through the center of the equilateral triangle. There are three limiting blocks 251, and the three limiting blocks 251 are evenly distributed around the outer contour of the secondary planetary carrier 25, and an avoidance groove 252 is formed between two adjacent limiting blocks 251. A bearing seat is provided at the center position of the mounting end 222, and a rotating bearing is provided in the bearing seat, and one end of the second sun gear shaft is connected to the rotating bearing. By providing a rotating bearing, the friction resistance of the secondary sun gear shaft 26 during rotation can be reduced.

[0037] Furthermore, the transmission assembly 2 also includes a primary bearing 28 , which is sleeved on the primary reduction module 21 , and the primary reduction module 21 is rotatably connected to the fixing seat 11 via the primary bearing 28 .

[0038] Specifically, the primary bearing 28 is located between the reduction module and the fixed seat 11, and the end of the primary bearing 28 is exposed from the open part of the fixed seat 11. The transmission assembly 2 also includes a limit screw 29, and the limit screw 29 abuts the end of the primary bearing 28. By setting the limit screw 29, the installation position of the primary bearing 28 is limited to prevent the primary bearing 28 from falling off. In this embodiment, the limit screw 29 includes an outer ring screw 291 and an inner ring screw 292. The tail end of the outer ring screw 291 is fixed on the fixed seat 11, and the cap end of the outer ring screw 291 abuts the fixed seat 11 and the primary bearing 28; the tail end of the inner ring screw 292 is fixed on the primary reduction module 21, and the cap end of the inner ring screw 292 abuts the primary reduction module 21 and the primary bearing 28. The limited installation of the primary bearing 28 is effectively realized. Among them, the connecting bearing 27 and the primary bearing 28 are coaxially arranged, so that the internal structure layout of the reduction box is reasonable and the failure rate in use is low. The connecting bearing 27 is a cross roller bearing, which can provide radial and axial support at the same time. For robot applications, the shaft system design outside the robot arm can be omitted, which greatly improves the system integration. The first-level bearing 28 adopts a 6706 bearing, which ensures the stability of the torque output and improves the power density and torque density of the reduction box.

[0039] The connecting bearing 27 adopts a cross roller bearing, which can provide radial and axial support at the same time. For robot applications, the shaft system design outside the robot arm can be omitted, which greatly improves the integration of the system.

[0040] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A modular two-stage planetary gear reduction box, comprising a box body (1) and a transmission assembly (2), wherein the transmission assembly (2) is arranged in the box body (1), and is characterized in that: The transmission assembly (2) comprises a primary reduction module (21), a planetary gear ring (23), a plurality of secondary planetary gears (24), a secondary planet carrier (25), a secondary sun gear shaft (26) and an output disc (22); the primary reduction module (21) is axially connected to the secondary sun gear shaft (26); the primary reduction module (21) is radially meshed with the planetary gear ring (23); the output disc (22) comprises an output end (221) and a mounting end (222); the mounting end (222) is connected to the planetary gear ring (23) via a connecting bearing (27). The mounting end (222) is provided with a plurality of mounting seats, each of the secondary planetary gears (24) is mounted on each of the mounting seats, a secondary sun gear shaft (26) is provided at a central position surrounded by the plurality of secondary planetary gears (24), each of the secondary planetary gears (24) is meshed with the planetary gear ring (23) and the secondary sun gear shaft (26), the secondary planet carrier (25) is fixed to the mounting end (222) and defines the secondary planetary gears (24), and a through hole is reserved on the secondary planet carrier (25) for the secondary sun gear shaft (26) to pass through.

2. The modular two-stage planetary gear reducer according to claim 1, characterized in that: The end of the first-stage reduction module (21) is provided with a connection hole (211), and the connection hole (211) is a waist-shaped hole or a square hole. The end of the second-stage sun gear shaft (26) is inserted into the connection hole (211) and matched therewith.

3. The modular two-stage planetary gear reducer as claimed in claim 1, characterized in that: The mounting end (222) is provided with a limiting groove, and the secondary planetary frame (25) is provided with a limiting block (251), and the limiting block (251) is embedded in the limiting groove and fixed by screws.

4. The modular two-stage planetary gear reducer as claimed in claim 3, characterized in that: At least two groups of the limiting grooves and the limiting blocks (251) are provided, and the secondary planet carrier (25) is provided with an avoidance groove (252) for the outer edge of the planetary wheel to pass through.

5. The modular two-stage planetary gear reducer as claimed in claim 1, characterized in that: The housing (1) comprises a fixed seat (11) and an end cover (12) which are fixedly connected, one end of the fixed seat (11) being open and allowing the end of the primary reduction module (21) to pass through, and one end of the end cover (12) being open and allowing the output disc (22) to pass through.

6. The modular two-stage planetary gear reducer as claimed in claim 5, characterized in that: The transmission assembly (2) further comprises a primary bearing (28), wherein the primary bearing (28) is sleeved on the primary reduction module (21), and the primary reduction module (21) is rotatably connected to the fixed seat (11) via the primary bearing (28).

7. The modular two-stage planetary gear reducer as claimed in claim 6, characterized in that: The primary bearing (28) is located between the reduction module and the fixed seat (11), and the end of the primary bearing (28) is exposed from the opening of the fixed seat (11). The transmission assembly (2) also includes a limit screw (29), and the limit screw (29) abuts against the end of the primary bearing (28).

8. The modular two-stage planetary gear reducer as claimed in claim 7, characterized in that: The limit screw (29) includes an outer ring screw (291) and an inner ring screw (292), the tail end of the outer ring screw (291) is fixed on the fixing seat (11), and the cap end of the outer ring screw (291) abuts against the fixing seat (11) and the primary bearing (28); the tail end of the inner ring screw (292) is fixed on the primary reduction module (21), and the cap end of the inner ring screw (292) abuts against the primary reduction module (21) and the primary bearing (28).

9. The modular two-stage planetary gear reducer as claimed in claim 6, characterized in that: The connecting bearing (27) and the primary bearing (28) are arranged coaxially.

10. The modular two-stage planetary gear reducer according to claim 1, characterized in that: The connecting bearing (27) is a cross roller bearing.

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