Integrally-formed cycloidal-pin wheel

Abstract

The utility model provides an integrally-formed cycloidal-pin wheel which comprises a wheel body and is characterized in that the wheel body is integrally formed by high polymer materials in a die-casting mode, and integral forming of the cycloidal-pin wheel is achieved through the precise die-casting forming technology. The technical problems of complicated working procedures, low production efficiency and poor product consistency caused by the working procedures of forging, finish turning, heat treatment, accurate grinding, superfinishing and the like adopted in a traditional machining mode are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of RV reducers, in particular to an integrally formed cycloid pinwheel. Background Art

[0002] With the rapid development of intelligent manufacturing and high-end equipment such as industrial robots and high-end CNC machine tools, RV reducers have become precision reducers widely used in the field of high-precision transmission. In recent years, domestic companies have made major breakthroughs in this field, with product technical indicators reaching international advanced levels, and multiple specification series have begun mass production, which provides basic conditions for the localization of robot RV reducers.

[0003] Chinese patent CN204025550U discloses an RV reducer for robots, characterized by: (1) high-speed stage: composed of an inner gear ring, planetary gears, gear shafts, and planet carriers; (2) low-speed stage: composed of an eccentric sleeve, a cylindrical roller bearing without an outer ring, a cycloidal wheel, a needle gear, a needle gear housing, and a pin-type output mechanism; (3) the machine base is sequentially connected to the needle gear housing and the retaining ring, the planet carrier is connected to the eccentric sleeve, and the output disk is connected to the end cover; (4) a cross roller bearing is installed between the needle gear housing and the output disk, a deep groove ball bearing is installed between the planet carrier and the output disk, and a deep groove ball bearing is installed between the eccentric sleeve and the machine base. The utility model has small size, stable transmission, large load-bearing capacity, and large transmission ratio.

[0004] However, the cycloidal pinwheel in this technical solution is generally produced by metal materials, which need to go through forging, precision turning, heat treatment, precision grinding, super-precision and other processes, resulting in complicated processes, low production efficiency and poor product consistency. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies in the prior art and provide an integrated cycloid pin wheel and a precision die-casting process to achieve integrated molding of the cycloid pin wheel, thereby solving the technical problems of complicated processes, low production efficiency and poor product consistency caused by traditional processing methods such as forging, precision turning, heat treatment, precision grinding and super-precision.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An integrally formed cycloid pinwheel comprises a wheel body, wherein the wheel body is integrally die-casted from a polymer material.

[0008] As an improvement, the polymer material is any one of nylon (PA), polyoxymethylene (POM), polypropylene (PP), polycarbonate (PC), polyester (PBT), polyphenylene sulfide (PPS), and polyetheretherketone (PEEK).

[0009] As an improvement, the polymer material is polyetheretherketone (PEEK).

[0010] As an improvement, the polyetheretherketone (PEEK) is carbon fiber reinforced polyetheretherketone (PEEK).

[0011] As an improvement, the wheel body is provided with a plurality of first transmission parts and a second transmission part spaced apart from the plurality of first transmission parts along its circumference, a plurality of third transmission parts are evenly distributed on the outer circumference of the wheel body, and a through hole for the main transmission shaft to pass through is provided in the middle of the wheel body.

[0012] As an improvement, the cross section of the first transmission part is circular; the cross section of the second transmission part is any one of a trapezoid, a triangle and a circle.

[0013] As an improvement, the third transmission parts are evenly distributed along the edge of the wheel body in an arc shape.

[0014] As an improvement, a circular groove is further provided on the side surface of the wheel body.

[0015] As an improvement, the width dimension of the groove is smaller than the diameter dimension of the first transmission part, and the cross section of the first transmission part overlaps with the cross section of the groove.

[0016] As an improvement, the center line of the groove is arranged to coincide with the center of the first transmission part.

[0017] The beneficial effects of the utility model are:

[0018] (1) The utility model realizes the one-piece molding of the cycloidal pinwheel through the precision die-casting process, solving the technical problems that the traditional processing method uses forging, precision turning, heat treatment, precision grinding, super-precision and other processes, resulting in complicated processes, low production efficiency and poor product consistency;

[0019] (2) The utility model adopts precision die-casting to improve the consistency of product dimensions and reduce the technical problems of poor dimensional stability and a large number of scraps caused by traditional processing methods.

[0020] (3) The cycloidal pinwheel is made of polymer materials instead of traditional metal materials. After being integrally formed, it can meet the use requirements without the need for additional processing, which greatly reduces the production process and improves production efficiency.

[0021] (4) The utility model adopts polymer materials to replace traditional metal materials, thereby realizing batch automatic production, improving production efficiency, reducing production costs, and reducing the weight of parts to achieve the purpose of weight reduction.

[0022] In summary, the utility model has the advantages of high production efficiency, good dimensional consistency, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a front view schematic diagram of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] Embodiment 1

[0028] like Figure 1-2 As shown, this embodiment provides an integrally formed cycloid pinwheel, comprising a wheel body 1, wherein the wheel body 1 is integrally formed by die-casting of a polymer material.

[0029] It should be noted that the wheel body 1 adopts a molding method selected from horizontal die casting, vertical die casting and vacuum die casting. Through precision die casting, it solves the problem that the traditional process of using alloy steel forging, precision turning, heat treatment, precision grinding, super-finishing and other processes leads to complicated processes, low production efficiency and poor product consistency. At the same time, it solves the technical problem of large number of scraps in each process and high comprehensive scrap rate when using metal machining.

[0030] In addition, this application adopts an integrated molding process. Under general process requirements, the molded product can be directly installed and used, reducing the subsequent complicated processes and improving production efficiency. Of course, according to different precision requirements, after integrated molding, appropriate processing steps can also be taken to further increase the size of the parts to meet higher requirements of the use scenario.

[0031] The use of polymer materials through precision die-casting can achieve batch production, high precision, stable product size consistency and efficient production of cycloid pinwheels.

[0032] Preferably, the polymer material is any one of nylon (PA), polyoxymethylene (POM), polypropylene (PP), polycarbonate (PC), polyester (PBT), polyphenylene sulfide (PPS), and polyetheretherketone (PEEK).

[0033] Furthermore, in this embodiment, the polymer material is preferably polyetheretherketone (PEEK), which has the advantages of high temperature resistance, high fatigue strength under alternating stress, high strength, high stiffness, self-lubrication, corrosion resistance, etc. after molding. Its mechanical properties are similar to those of the cycloidal pinwheel produced by machining of metal materials, and some of its properties are even stronger than those of the cycloidal pinwheel produced by machining of metal materials, such as strength.

[0034] Of course, the polyetheretherketone (PEEK) selected in the present application can also be modified to further improve its performance to obtain enhanced polyetheretherketone (PEEK). The modification methods include filling modification, blending modification, surface modification, cross-linking modification, conductive modification, etc., and one modification method or a combination of multiple modification methods can be selected.

[0035] Conventional polyetheretherketone (PEEK) is obtained by adding carbon fiber material to obtain carbon fiber reinforced polyetheretherketone to improve the hardness, rigidity, wear resistance and thermal stability of PEEK.

[0036] The properties of the wheel body 1 after die-casting are shown in Table 1.

[0037]

[0038] In this embodiment, the wheel body 1 is provided with a plurality of first transmission parts 2 along its circumference and a plurality of second transmission parts 3 spaced apart from the plurality of first transmission parts 2, a plurality of third transmission parts 4 are evenly distributed on the outer circumference of the wheel body 1, and a through hole 5 for the main transmission shaft to pass through is provided in the middle of the wheel body 1.

[0039] Preferably, the cross-section of the first transmission part 2 is circular. In the cycloidal pinwheel reducer, the eccentric shaft passes through the first transmission part 2, and the rotation of the eccentric shaft drives the wheel body 1 to move in a circular motion; the cross-section of the second transmission part 3 is any one of a trapezoid, a triangle, and a circle, and the present embodiment is preferably a trapezoid.

[0040] Preferably, the third transmission parts 4 are evenly distributed along the edge of the wheel body 1 in an arc shape.

[0041] Embodiment 2

[0042] like Figure 1-2 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0043] In this embodiment, a circular groove 6 is further provided on the side of the wheel body 1 to reduce the contact area between the wheel body 1 and the flange against the side during rotation, thereby reducing friction, improving transmission accuracy and increasing the service life of the wheel body 1.

[0044] Preferably, the width of the groove 6 is smaller than the diameter of the first transmission part 2 , and the cross-section of the first transmission part 2 overlaps with the cross-section of the groove 6 .

[0045] Furthermore, a center line 61 of the groove 6 is arranged to coincide with the center 21 of the first transmission part 2 .

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrally formed cycloid pin wheel, comprising a wheel body, characterized in that: The wheel body is integrally die-casted from a polymer material, and the polymer material is any one of nylon, polyoxymethylene, polypropylene, polycarbonate, polyester (PBT), polyphenylene sulfide (PPS), and polyetheretherketone (PEEK).

2. The one-piece cycloid pin wheel according to claim 1, characterized in that: The polymer material is polyetheretherketone (PEEK).

3. The one-piece cycloid pin wheel according to claim 2, characterized in that: The polyetheretherketone (PEEK) is carbon fiber reinforced polyetheretherketone (PEEK).

4. The one-piece cycloid pin wheel according to any one of claims 1 to 3, characterized in that: The wheel body is provided with a plurality of first transmission parts and second transmission parts spaced apart from the first transmission parts along its circumference, a plurality of third transmission parts are evenly distributed on the outer circumference of the wheel body, and a through hole for the main transmission shaft to pass through is provided in the middle of the wheel body.

5. The one-piece cycloid pin wheel according to claim 4, characterized in that: The cross section of the first transmission part is circular; the cross section of the second transmission part is any one of a trapezoid, a triangle and a circle.

6. The one-piece cycloid pin wheel according to claim 4, characterized in that: The third transmission parts are evenly distributed along the edge of the wheel body in an arc shape.

7. The one-piece cycloid pin wheel according to claim 4, characterized in that: A circular groove is also provided on the side of the wheel body.

8. The one-piece cycloid pin wheel according to claim 7, characterized in that: The width of the groove is smaller than the diameter of the first transmission part, and the cross section of the first transmission part overlaps with the cross section of the groove.

9. The one-piece cycloid pin wheel according to claim 7, characterized in that: The center line of the groove is arranged to coincide with the center of the first transmission part.

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