Planetary gear reduction gearbox

Abstract

The planetary gear reduction gearbox comprises a shell and an end cover fixed to the end of the shell, the shell comprises a gear ring, and a step groove is formed in the end, close to the end cover, of the gear ring; the end cover is fixed to the position of the step groove of the gear ring through a die casting technology, inner teeth extending towards the two sides are arranged on the inner wall of the gear ring, a gasket is assembled in the gear ring in an interference mode, and the gasket is connected with the end face of the inner teeth. The end cover is simple in structure, the gasket is assembled in the gear ring in an interference mode, and in the pressure casting process of the end cover, when one end of the positioning column abuts against the end face of the gasket, the shaft hole can be effectively blocked. According to the mode of combining the positioning column and the gasket, molten aluminum for die-casting the end cover is effectively prevented from flowing into the shell through the shaft hole, so that a good sealing effect is ensured, and the risk of molten aluminum leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to planetary gear reduction box technical field, specifically a kind of planetary gear reduction box. BACKGROUND

[0002] In the design of planetary reduction motor, a planetary gear reducer is usually integrated to realize the function of speed reduction and torque increase, and is widely used in occasions requiring precise speed control and high torque output. Specifically, the planetary gear reducer is usually composed of two main components, a shell and an end cover. There are various ways of shell and end cover, among which the two most common ways are bolted or directly die-casting the end cover on the end of the shell. For example, as shown in Figures 1-4 The structure of the planetary gear reducer includes a shell 1A and an end cover 2A. In order to prevent the aluminum liquid used for die-casting from entering the shell 1A, the traditional technology inserts a matching external tooth column into the shell 1A to block the flow of aluminum liquid. However, since the external tooth column is replaceable, and during frequent use, gaps may occur between the external tooth column and the shell 1A. Once these gaps are formed, un-solidified aluminum liquid will enter the shell 1A through these gaps, causing potential problems. In addition, in order to facilitate demolding during the manufacturing process, multiple top holes are designed on the end cover 2A. These top holes are in communication with the inside of the end cover 2A after die-casting is completed, which helps to form a more uniform pressure distribution inside the end cover. Especially during the cooling and shrinkage process of die-casting, it ensures that the entire assembly can maintain its structural stability and rigidity even after the end cover 2A is fixedly connected to the end of the shell 1A. However, in actual application, the presence of top holes may cause oil to leak through the gaps between the gears and the top holes on the end cover to the other side of the end cover. Therefore, a planetary gear reduction box is proposed. SUMMARY

[0003] The purpose of the present utility model is to provide a planetary gear reduction box to solve the problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a planetary gear reduction box, comprising a shell and an end cover fixed at the end of the shell, the shell includes a gear ring, a step groove is formed at the end of the gear ring near the end cover, the end cover is fixed on the step groove position of the gear ring by die-casting process, the inner wall of the gear ring is provided with internal teeth extending to both sides, and the gear ring is assembled with a gasket inside the internal teeth, and the gasket is connected with the end face of the internal teeth.

[0005] As a further scheme of the utility model: the end cover includes an end cover body, and ear holes and a stop opening are opened on the end face of the end cover body away from the gear ring.

[0006] As a further scheme of the utility model: the end cover body forms a sealed cavity, and the end face of the end cover body away from the gear ring is also provided with a top hole not communicated with the sealed cavity.

[0007] As a further scheme of the utility model: the step groove is provided with a plurality of positioning holes.

[0008] As a further scheme of the utility model: the sealed cavity is provided with a positioning pin corresponding to the positioning hole on the step groove.

[0009] As a further scheme of the utility model: the outer circumferential surface of the step groove is provided with at least one water stop ring groove.

[0010] As a further scheme of the utility model: the sealed cavity is provided with a water stop ring strip corresponding to the water stop ring groove on the step groove.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The utility model is provided with a gasket in the gear ring through interference assembly, and when the one end of the positioning column abuts against the end face of the gasket during the die casting process of the end cover, the shaft hole can be effectively blocked. The positioning column and the gasket are combined, the aluminum liquid for die casting the end cover is prevented from flowing into the shell interior through the shaft hole, good sealing effect is ensured, and the risk of aluminum liquid leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic view of the planetary gear reduction box in the prior art of the utility model;

[0014] Figure 2 It is the 1A and 2A connecting place section view schematic view of the planetary gear reduction box in the prior art of the utility model;

[0015] Figure 3 It is the 1A schematic view of the planetary gear reduction box in the prior art of the utility model;

[0016] Figure 4 It is the 2A first section view schematic view of the planetary gear reduction box in the prior art of the utility model;

[0017] Figure 5 It is the 2A second section view schematic view of the planetary gear reduction box in the prior art of the utility model;

[0018] Figure 6 It is the whole structure schematic view of the planetary gear reduction box of the utility model;

[0019] Figure 7 It is the shell and end cover split schematic view of the utility model;

[0020] Figure 8 It is the cross section schematic view of the planetary gear reduction box of the utility model;

[0021] Figure 9 It is the shell and pressure pad combination schematic view of the utility model;

[0022] Figure 10 It is the shell schematic view of the utility model;

[0023] Figure 11 It is the end cover cross section schematic view of the utility model;

[0024] Figure 12 It is the end cover body side schematic view of the utility model;

[0025] Figure 13 It is the positioning column and pressure pad connection schematic view of the utility model;

[0026] In the drawing: 1, shell;11, gear ring;12, inner tooth;13, step groove;14, water stop ring groove;15, positioning hole;2, end cover;21, end cover body;22, ear hole;23, sealing cavity;24, water stop ring strip;25, positioning pin;26, stop opening;3, pressure pad. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Please refer to Figures 6-13The utility model discloses an embodiment of a kind of planetary gear reduction gearbox, including shell 1 and the end cover 2 of fixed in the end of shell 1, end cover 2 is integrally pressure die forming, shell 1 includes gear ring 11, and the end of gear ring 11 near end cover 2 is formed with step groove 13;End cover 2 is fixed in the step groove 13 position of gear ring 11 by pressure die process, the inner wall of gear ring 11 is equipped with the inner tooth 12 extending to two sides, wherein the end face of inner tooth 12 near gear ring 11 is equipped with gasket 3, the end face of gasket 3 away from inner tooth 12 is connected with the end face of end cover 2, end cover 2 and gasket 3 are coaxially arranged, gasket 3 is pressed into shell 1 by interference fit, and its one end is in close contact with the end part of inner tooth 12 in shell 1, and in the process of pressure die, when the other end of gasket 3 is against positioning column, shaft hole can be effectively blocked, the combination mode of this positioning column and gasket 3 prevents the aluminum liquid for pressure die end cover 2 from flowing into shell 1, specifically, positioning column is integrally arranged with movable mould, when fixed mould and movable mould are in closed state, the end of positioning column is just against the end face of gasket 3, the design feature of positioning column is that the outer diameter of its end face is greater than the inner diameter of the shaft hole in the middle part of gasket 3, which means that when the end of positioning column is in contact with gasket 3, shaft hole can be effectively blocked to prevent the aluminum liquid for pressure die end cover 2 from flowing into shell 1. By comparison, the method used in traditional technology is to insert a matching outer tooth column in inner tooth 12 to block the flow of aluminum liquid, however, since this outer tooth column is replaceable, and in the process of frequent use, gap is easy to generate between outer tooth column and inner tooth 12, once this gap is formed, un-solidified aluminum liquid can flow into inner tooth 12 through these gaps, causing potential problems.

[0029] Please refer to Figures 7-8 In an embodiment, in the embodiment, preferably, end cover 2 includes end cover body 21, and ear hole 22 and stop opening 26 are formed in the end face of end cover body 21 away from gear ring 11, in the embodiment, preferably, the number of ear holes 22 is two, and they are symmetrically arranged on end cover body 1, sealing cavity 23 is formed in end cover body 21, top hole, which is not communicated with sealing cavity 23, is also formed in the end face of end cover body 21 away from gear ring 11, and stop opening 26 is also not communicated with sealing cavity 23, which ensures the stability of planetary gear reduction gearbox during operation, avoids serious oil leakage phenomenon, and thus causes major economic losses.

[0030] Please refer to Figures 9-11In an embodiment, preferably, a plurality of positioning holes 15 are arranged on the stepped groove 13, and a plurality of positioning pins 25 corresponding to the positioning holes 15 are arranged in the sealing cavity 23. The number of the positioning pins 25 is the same as that of the positioning holes 15. The number of the positioning holes 15 is not limited. In the embodiment, preferably, the number of the positioning holes 15 is eight. The eight positioning holes 15 are distributed on the stepped groove 13 at equal intervals, so that the relative force between the shell 1 and the end cover 2 can be larger. The positioning pins 25 are manufactured by die casting process. When the positioning pins 25 cooperate with the positioning holes 15, the sealing performance can be ensured, and the liquid leakage can be effectively prevented. Even if some liquid in the shell 1 leaks, the liquid can only flow into the space between the water stop ring groove 14 and the water stop ring 24 through the gap between the positioning pin 25 and the positioning hole 15. Due to the design of the water stop ring groove 14 and the water stop ring 24, the micro-leakage can be effectively collected and isolated, so that the risk of liquid leakage is avoided, and the excellent liquid leakage prevention effect is achieved.

[0031] Please refer to Figures 9-11 In an embodiment, preferably, at least one water stop ring groove 14 is arranged on the stepped groove 13, and a water stop ring 24 corresponding to the water stop ring groove 14 is arranged in the sealing cavity 23. The number of the water stop ring groove 14 is not limited and can be designed according to the actual situation. In the embodiment, preferably, the number of the water stop ring groove 14 is two, and the number of the water stop ring 24 is the same as that of the water stop ring groove 14. When the gear box is used, even if some liquid leaks through the gap between the end cover 2 and the shell 1, the liquid can only leak along the stepped groove 13 because the side of the end cover 2 away from the shell 1 is in a sealed state. At this time, the water stop ring groove 14 and the water stop ring 24 can further prevent the liquid from leaking from this place, so that the liquid leakage prevention effect of the connection between the end cover 2 and the shell 1 is greatly improved.

[0032] Please refer to Figure 6 and Figure 13 In an embodiment, preferably, the inner wall of the gear ring 11 is provided with inner teeth 12 extending to both sides. The inner teeth 12 are provided with a gasket 3 near the end face of the gear ring 11. The end face of the gasket 3 away from the inner teeth 12 is connected with the end face of an end cover body 21. The end cover body 21 is coaxially arranged with the gasket 3. The gasket 3 is pressed into the shell 1 by interference fit. The processing technology of the planetary gear reducer box includes the following steps:

[0033] S1: The truncated blank is clamped on the numerical control equipment for rough turning, and the gasket is pressed into the shell after rough turning;

[0034] Specifically, the 45# steel pipe is cut off by a disc saw to obtain a blank material before shell processing, the blank material is normalized, and the hardness of the blank material is HB170-217; the blank material is then fixed on a numerical control lathe, the step groove 13 and the water stop ring groove 14 are machined by outer circle positioning with the blank end face, the positioning hole 15 is machined by positioning with the gear ring 11 end face by using a drilling machine, the internal gear 12 in the gear ring 11 is machined by using a numerical control gear shaper, the internal gear 12 is heat treated by using a numerical control high frequency machine, and the hardness and hardened layer of the tooth surface are detected, and finally the gasket 3 is pressed into the inside of the shell 1.

[0035] S2: the shell in S1 is loaded into a mold, the mold is driven by a die casting machine from an open state to a closed state, aluminum liquid is introduced into the mold from the outside to cool and solidify to form, and then the die casting is ejected and cooled;

[0036] S21, the shell is assembled into a fixed mold, and the gasket pressed into the shell is ensured to be installed in place;

[0037] S22, after the movable mold and the fixed mold are combined by the die casting machine, the aluminum liquid in the holding furnace is transferred to the movable mold cavity to cool and solidify;

[0038] S23, the cooled die casting is ejected from the movable mold cavity and placed on a workbench to cool.

[0039] Specifically, before the shell is loaded into the mold, the debris in the mold cavity is blown away by compressed air (blowing air pressure ≥ 4 (bar), blowing time 4-15S), and then the prepared coating water is sprayed onto the surface of the mold cavity (spraying time 4-15S, blowing air pressure ≥ 4 (bar), coating brand and ratio: fine and smooth, no dripping water, uniform spraying), then the excess coating is blown dry by compressed air (blowing air pressure ≥ 4 (bar), blowing time 4-10S), then the shell is assembled into the fixed mold, and the gasket pressed into the shell is ensured to be installed in place, then the mold is driven by the die casting machine from the open state to the closed state (mold closing hydraulic oil pressure 13±1Mpa), the aluminum liquid is scooped from the holding furnace ((no cold or sticky material is mixed in the scooped material, the material handle thickness is controlled at 25-35mm, and the temperature is controlled at 650-680℃), the die casting is ejected from the mold cavity and placed on the workbench to cool.

[0040] The die casting process parameters are set as follows:

[0041]

[0042] Although the present specification is described in terms of embodiments, not every embodiment exhibits every characteristic or implements every combination of features described in the specification. In addition, the description of the specification is not to be understood as an entire list of features available to the inventor that forms the scope of the disclosure. Embodiments described herein merely represent a description of the applications of various combinations of features, and as such other embodiments of the applications can be developed and implemented which use any combination of features described in the specification, even if the combination is not explicitly described in the specification.

[0043] The above description is merely illustrative of the embodiments of the present application and is not in any way intended to limit the scope of the application. It is thus contemplated that any and all modifications, variations or equivalents that fall within the spirit and scope of the basic underlying principles disclosed herein are fully intended to fall within the scope of the application as expressed in the appended claims.

Claims

1. A planetary reduction gearbox comprising a housing (1) and an end cover (2) fixed to an end of the housing (1), characterised in that, The shell (1) comprises a gear ring (11) with a stepped groove (13) formed at the end of the gear ring (11) near the end cover (2); the end cover (2) is fixed on the stepped groove (13) of the gear ring (11) by a die casting process, and the inner wall of the gear ring (11) is provided with inner teeth (12) extending to both sides, and the gear ring (11) is assembled with a gasket (3) inside by interference, and the gasket (3) is connected with the end face of the inner teeth (12).

2. A planetary gear reduction box according to claim 1, characterised in that, The end cover (2) comprises an end cover body (21), and the end face of the end cover body (21) away from the gear ring (11) is provided with an ear hole (22) and a stop opening (26).

3. A planetary gear reduction box according to claim 2, characterised in that, The end cover body (21) is formed with a sealing cavity (23), and the end face of the end cover body (21) away from the gear ring (11) is also provided with a top hole not communicating with the sealing cavity (23).

4. A planetary gear reduction box according to claim 3, characterised in that, A plurality of positioning holes (15) are formed on the stepped groove (13).

5. A planetary gear reduction box according to claim 4, characterised in that, The sealing cavity (23) is provided with a positioning pin (25) corresponding to the positioning hole (15) on the stepped groove (13).

6. The planetary gear reduction box of claim 3, wherein, At least one water stop ring groove (14) is formed on the outer circumferential surface of the stepped groove (13).

7. A planetary gear reduction box according to claim 6, characterised in that, The sealing cavity (23) is provided with a water stop ring (24) corresponding to the water stop ring groove (14) on the stepped groove (13).

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