Three-stage cycloid planetary reducer

Abstract

The utility model discloses a three-stage cycloid planetary reducer which comprises a shell, a base, an upper cover and an input shaft, and three sections of eccentric curved necks are formed on the input shaft. The cycloidal speed reducing mechanism comprises two stages of transmission shafts, and a cycloidal gear is arranged on the two stages of transmission shafts; the planetary reducing mechanism comprises a third-stage transmission shaft, a planetary driving gear and a planetary driven gear, and the planetary driving gear is mounted on the second-stage transmission shaft; the number of the three-stage transmission shafts is four, each three-stage transmission shaft is connected with a planet driven gear, and the planet driven gears located on the two sides of the same planet driving gear are meshed with the planet driving gear; an output gear ring is formed in the middle of the inner side of the shell, an output driving gear is arranged on the third-level transmission shaft, and the output driving gear is meshed with the output gear ring. The speed reducer is simpler in overall structure, the reduction ratio of the whole speed reducer can be increased, the internal impact force of the speed reducer is effectively reduced, and the overall working efficiency and stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical drive technical field especially relates to a three-stage cycloid planetary reducer. BACKGROUND

[0002] The cycloid reducer is a kind of reduction mechanism using cycloid pin wheel meshing transmission.This reducer has replaced two-stage, three-stage ordinary cylindrical gear reducer and cylindrical worm reducer in most cases.But the traditional reducer generally uses gear structure of external force combination, although it is relatively mature in efficiency and structure, but the application in internal force combination is not perfect, especially the cycloid structure pressure angle is larger in internal force combination transmission, it can cause the problem of larger impact force and unstable structure, causes the vibration or shaking of reducer, affects working efficiency and stability. SUMMARY

[0003] In view of the above-mentioned deficiencies of prior art, the utility model aims at solving the problems of complex structure, poor stability and low reduction efficiency of existing reduction mechanism, provides a three-stage cycloid planetary reducer, the overall structure is simpler, can increase the reduction ratio of the whole reducer, effectively reduces the impact force in the reducer, and improves the overall working efficiency and stability.

[0004] In order to solve the above-mentioned technical problem, the utility model adopts the technical scheme as follows: a three-stage cycloid planetary reducer, including shell, base, upper cover and input shaft, the input shaft is coaxial with the shell and is connected with the base and the upper cover through bearing;Its characterized in that: the part of input shaft between base and upper cover is formed with three eccentric curved necks, and the three eccentric curved necks are uniformly distributed around the input shaft;It further includes cycloid reduction mechanism and planetary reduction mechanism;

[0005] The cycloid reduction mechanism includes two pairs of two-stage transmission shafts symmetrically arranged on the two sides of input shaft, and a cycloid gear is arranged on each eccentric curved neck on the two-stage transmission shaft corresponding to each eccentric curved neck, the cycloid gear is fixedly connected with the two-stage transmission shaft and is engaged with the corresponding eccentric curved neck;The two-stage transmission shaft is connected with the base and the upper cover through bearing, and the upper end thereof passes through the upper cover;

[0006] The planetary reduction mechanism includes three-stage transmission shaft, planetary driving gear and planetary driven gear, the planetary driving gear is installed on the end of two-stage transmission shaft extending out of the upper cover;The three-stage transmission shaft is four, and is uniformly distributed around the input shaft, and is connected with the base and the upper cover through bearing;The upper end of the three-stage transmission shaft is connected with a planetary driven gear after passing through the upper cover, wherein the planetary driven gears on the two sides of the same planetary driving gear are engaged with the planetary driving gear;

[0007] An output gear ring is formed in the middle of the inner side of the shell, and an output drive gear is arranged on the three-stage transmission shaft at a position corresponding to the output gear ring, and the output drive gear meshes with the output gear ring.

[0008] Further, a connecting flange is formed around the outer side of the shell.

[0009] Further, a boss is arranged on each of the opposite sides of the base and the upper cover near the opposite two side edges, and a screw hole is arranged on each of the two bosses and penetrates the boss, the base and the lower cover, and the base and the upper cover are connected by bolts passing through the screw holes.

[0010] Further, the upper cover and the base are connected to the shell by bearings.

[0011] Further, a weight-reducing groove is arranged on the lower side of the base.

[0012] Compared with the prior art, the speed reducer has the following advantages: simple structure, larger speed reduction ratio, more compact size, advanced structure design, realization of a speed reducer with the same structure and multiple speed reduction ratios by replacing the second-stage transmission gear, great reduction of manufacturing difficulty and manufacturing cost, effective reduction of impact force inside the speed reducer, and improvement of overall working efficiency and stability, and realization of both shell fixing and shaft fixing installation forms by the same structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a structural schematic view of the speed reducer.

[0014] Figure 2 Fig. 2 is a structural schematic view of the shell.

[0015] Figure 3 Fig. 3 is a structural schematic view of the internal structure of the shell.

[0016] Figure 4 Fig. 4 is a structural schematic view of the speed reducer after the shell and the upper cover are removed.

[0017] Figure 5 Fig. 5 is a structural schematic view of the cycloid mechanism and the planetary gear mechanism.

[0018] In the drawings: 1 - shell, 2 - upper cover, 3 - base, 4 - input shaft, 5 - eccentric curved neck, 6 - second-stage transmission shaft, 7 - cycloid wheel, 8 - planetary driving gear, 9 - three-stage transmission shaft, 10 - planetary driven gear, 11 - output drive gear, 12 - output gear ring, 13 - connecting flange. DETAILED DESCRIPTION

[0019] The speed reducer will be further described below in combination with the drawings and embodiments.

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0021] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical" and the like do not mean that the parts must be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should also be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Embodiment: see Figures 1-5The utility model provides a kind of three-stage cycloid planetary reducer, including shell, base, upper cover and input shaft, the input shaft is coaxial with shell center line arrangement, and is connected with base and upper cover by bearing. When implementation, the upper cover and base are connected with shell by bearing. Wherein, the side of base and upper cover opposite each other, close to two sides opposite two side edges respectively is equipped with a boss, and screw hole is equipped on two bosses and passes through boss and base and lower cover, and base and upper cover are connected by bolt passing through screw hole;So it can improve the stability of overall structure. Weight-reducing groove is provided on the underside of base to reduce the overall weight of reducer.

[0023] The part of input shaft between base and upper cover is formed with three eccentric curved necks, and the (axial lines of) three eccentric curved necks are uniformly distributed around (the axial line of) input shaft. It also includes a cycloid reduction mechanism and a planetary reduction mechanism.

[0024] The cycloid reduction mechanism includes two pairs of two-stage transmission shafts symmetrically arranged on both sides of input shaft, and a cycloid gear is arranged on each eccentric curved neck corresponding to the two-stage transmission shaft. The cycloid gear is fixedly connected with the two-stage transmission shaft and engages with the corresponding eccentric curved neck. The two-stage transmission shaft is connected with the base and the upper cover by bearings, and the upper end thereof passes through the upper cover.

[0025] The planetary reduction mechanism includes three-stage transmission shafts, planetary driving gears and planetary driven gears. The planetary driving gears are installed on the ends of the two-stage transmission shafts extending out of the upper cover. The three-stage transmission shafts are four in number and are uniformly distributed around the input shaft and are connected with the base and the upper cover by bearings. The upper ends of the three-stage transmission shafts are connected with planetary driven gears after passing through the upper cover. The planetary driven gears on both sides of the same planetary driving gear engage with the planetary driving gear.

[0026] An output gear ring is formed in the middle of the inner side of the shell, and an output drive gear is arranged on each three-stage transmission shaft corresponding to the position of the output gear ring. The output drive gear engages with the output gear ring. A connecting flange is formed around the outer side of the shell.

[0027] During operation, power is input from the input shaft. Due to the eccentric curved necks of the input shaft, the eccentric curved necks cooperate with the cycloid gears to form a first-stage cycloid reduction output. The planetary driving gears are arranged on the two-stage transmission shafts, which cooperate with the planetary driven gears to form a second-stage reduction. The output drive gears are arranged on the three-stage transmission shafts, which engage with the output gear ring to form a three-stage output and are output through the shell. Throughout the process, the stability is better and the reduction ratio is higher.

[0028] In the scheme, the reduction ratio of the whole speed reducer is larger, and the volume is more compact; the structure design is advanced, the same structure multiple reduction ratio speed reducer is realized by replacing the secondary transmission gear, the manufacturing difficulty and manufacturing cost are greatly reduced; and the impact force in the speed reducer can be effectively reduced, the overall working efficiency and stability are improved; at the same time, the same structure can realize the shell fixed and the shaft fixed two installation forms.

[0029] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those skilled in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the purpose and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. A three-stage cycloid planetary reducer, comprising a housing, a base, an upper cover and an input shaft, the input shaft is coaxial with the housing, and is connected with the base and the upper cover through bearings; characterized in that: The part between the base and the upper cover of the input shaft is formed with three eccentric curved necks, which are uniformly distributed around the input shaft; the cycloid reduction mechanism and the planetary reduction mechanism are further included; The cycloid reduction mechanism includes two secondary transmission shafts symmetrically arranged on both sides of the input shaft, and a cycloid gear is arranged on each eccentric curved neck on the secondary transmission shaft; the cycloid gear is fixedly connected with the secondary transmission shaft and engaged with the corresponding eccentric curved neck; the secondary transmission shaft is connected with the base and the upper cover through bearings, and the upper end thereof penetrates the upper cover; The planetary reduction mechanism includes tertiary transmission shafts, planetary driving gears and planetary driven gears; the planetary driving gears are installed on the end of the secondary transmission shaft extending out of the upper cover; the tertiary transmission shafts are four and are uniformly distributed around the input shaft, and are connected with the base and the upper cover through bearings; the upper end of the tertiary transmission shaft penetrates the upper cover and is connected with a planetary driven gear, respectively; the planetary driven gears on both sides of the same planetary driving gear are engaged with the planetary driving gear; An output gear ring is formed in the middle of the inner side of the shell, and an output driving gear is arranged on the tertiary transmission shaft at the position corresponding to the output gear ring; the output driving gear is engaged with the output gear ring.

2. The three-stage cycloidal planetary reducer of claim 1, wherein: A connecting flange is formed on the outer side of the shell and surrounds the shell.

3. The three-stage cycloidal planetary reducer of claim 1, wherein: The opposite sides of the base and the upper cover are respectively provided with a boss near the opposite edges of the two sides; screw holes are formed in the two bosses and penetrate the bosses, the base and the lower cover; the base and the upper cover are connected through bolts penetrating the screw holes.

4. The three-stage cycloidal planetary reducer of claim 1, wherein: The upper cover and the base are connected with the shell through bearings.

5. The three-stage cycloidal planetary reducer of claim 1, wherein: A lightening groove is arranged on the lower side of the base.

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