CN210034303U - Single-stage large transmission ratio gear reducer - Google Patents
Single-stage large transmission ratio gear reducer Download PDFInfo
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- CN210034303U CN210034303U CN201920310921.6U CN201920310921U CN210034303U CN 210034303 U CN210034303 U CN 210034303U CN 201920310921 U CN201920310921 U CN 201920310921U CN 210034303 U CN210034303 U CN 210034303U
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Abstract
The embodiment of the utility model discloses big drive ratio gear reducer of single-stage, include: the device comprises at least three planetary gears, a sun gear, a cup-shaped shell and a fixed inner fluted disc; the central gear is an external gear, and the cup-shaped shell and the fixed internal fluted disc are respectively provided with a first internal gear ring and a second internal gear ring; the sun gear, the first inner gear ring and the second inner gear ring are coaxially arranged and are respectively and simultaneously meshed with at least three planetary gears; the central gear is driven to rotate by external torque, and the cup-shaped shell is used for outputting torque. The single-stage gear reducer with large transmission ratio can provide larger transmission ratio, is favorable for improving the transmission rigidity and the bearing capacity of the transmission pair, and reduces the processing and manufacturing cost; the service life is longer, and the maintenance cost is lower; the part type and quantity are less, and weight is lighter, and convenient to detach and maintenance can replace harmonic gear reduction unit etc. have important practical value.
Description
Technical Field
The utility model relates to a gear drive technical field especially relates to a big drive ratio gear reducer of single-stage.
Background
The reducer is an indispensable key component of a robot and a servo system and is used for converting a smaller moment and a higher rotating speed of a motor into a larger moment and a lower rotating speed to drive the joint to move. At present, the harmonic gear reducer is widely applied to the fields of robots, aerospace and the like. The harmonic gear transmission realizes motion conversion by means of flexible elastic deformation of thin-wall parts, and the main parts are a flexible gear, a rigid gear and a wave generator. The harmonic gear reducer has small gear module, complex machining process and high requirement on a cutter. However, the flexible parts are easy to generate fatigue damage in the using process and have limited service life; the harmonic gear transmission can only bear pure torque load generally, the composite load capacity is poor, and when the harmonic gear transmission bears the composite load of torque, bending moment, axial force and the like, the load capacity is obviously reduced, even normal transmission cannot be realized; therefore, a new type of speed reducer is required.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a single-stage large transmission ratio gear reducer.
According to an aspect of the utility model, a large drive ratio gear reducer of single-stage is provided, include: the device comprises at least three planetary gears, a sun gear, a cup-shaped shell and a fixed inner fluted disc; the central gear is an external gear, and the cup-shaped shell and the fixed internal fluted disc are respectively provided with a first internal gear ring and a second internal gear ring; the sun gear, the first inner gear ring and the second inner gear ring are coaxially arranged and are respectively and simultaneously meshed with the at least three planetary gears; the cup-shaped shell is used for outputting the output torque of the single-stage large transmission ratio gear reducer.
Optionally, the fixed inner toothed disc is provided with a central through hole, and inner teeth for meshing with the at least three planetary gears are arranged on the inner wall of the central through hole to form a second inner gear ring; the first inner gear ring and the second inner gear ring enclose a reducer cavity, and the sun gear and the at least three planetary gears are arranged in the reducer cavity.
Optionally, the sun gear comprises: a gear body and an input shaft; the gear body is fixedly connected with the input shaft; the bottom end of the cup-shaped shell is provided with a coaxial mounting through hole communicated with the first inner gear ring, and the input shaft is rotatably connected with the mounting through hole; wherein the input shaft is used for inputting the external torque.
Optionally, comprising: the front support plate, the rear support plate and the planet wheel shaft; the planet wheel shaft is rotationally connected with a central hole of the planet gear, and the front support plate and the rear support plate are respectively connected with two ends of the planet wheel shaft.
Optionally, the central shaft comprises: a connecting shaft; the connecting shaft is fixedly connected with the gear body, the gear body is positioned between the connecting shaft and the input shaft, and the outer diameter of the gear body is larger than the diameters of the connecting shaft and the input shaft; the front support plate and the rear support plate are respectively provided with a first central mounting through hole and a second central mounting through hole; the connecting shaft is in clearance fit with the first center mounting through hole, and the second center mounting through hole is in clearance fit with the input shaft; the fixed inner fluted disc is positioned between the cup-shaped shell and the front support plate, and the rear support plate is positioned in the cavity of the speed reducer.
Optionally, the input shaft is rotatably connected with the mounting through hole through a bearing; the planet wheel shaft is rotationally connected with the central hole of the planet gear through a bearing.
Optionally, the input shaft, the connecting shaft and the gear body are integrally formed.
Optionally, a connecting hole for connecting with a torque output device is arranged at the bottom of the cup-shaped shell; wherein, the connecting hole includes: a threaded bore.
Optionally, a mounting hole is provided at an edge of the fixed inner gear plate, wherein the mounting hole includes: through holes or threaded holes.
Optionally, the number of the planet gears is multiple, and the plurality of the planet gears are uniformly distributed along the circumferential direction of the sun gear; the reduction ratio of the single-stage large-transmission-ratio gear reducer is 50-330.
The single-stage gear reducer with large transmission ratio can provide larger transmission ratio, and can output consistent or larger torque compared with a harmonic gear transmission type reducer and the like; the gear has a larger modulus, which is beneficial to improving the transmission rigidity and the bearing capacity of the transmission pair and reducing the processing and manufacturing cost; the flexible element is not arranged, the service life is longer, and the maintenance cost is lower; the transmission clearance can be reduced, and the transmission rigidity and the bearing capacity are increased; the part type and quantity are less, and weight is lighter, and convenient to detach and maintenance can replace harmonic gear reduction unit etc. have important practical value.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
FIG. 1 is a schematic diagram of the composition of an embodiment of a single stage large ratio gear reducer according to the present invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of a single stage large ratio gear reducer according to the present invention;
fig. 3 is a schematic layout of the planetary gears of an embodiment of a single stage large ratio gear reducer according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The technical solution of the present invention is described in many aspects with reference to the drawings and the embodiments.
Hereinafter, "first", "second", etc. are descriptively distinct and have no other special meaning.
As shown in fig. 1-3, the present invention provides a single-stage large transmission ratio gear reducer, comprising: at least three planet gears, a sun gear 4, a cup-shaped shell 10 and a fixed inner fluted disc 1. The central gear 4 is an external gear, and the cup-shaped shell 10 and the fixed internal gear 1 are respectively provided with a first internal gear ring 18 and a second internal gear ring 17. The sun gear 4, the first internal gear ring 18 and the second internal gear ring 17 are coaxially arranged and are respectively engaged with at least three planetary gears at the same time. The cup type housing 10 serves to output torque by rotating the sun gear 4 by external torque.
Planetary gears are gears that can rotate around their own axis of rotation, as well as around their own axis of rotation, as in a fixed axis gear, and rotation around their own axis is called "rotation", and rotation around the axis of another gear is called "revolution". The number of the planetary gears can be 3, 4 and the like, and the planetary gears are arranged in a single row. The external torque may be provided by a motor, and the cup-shaped housing 10 is driven by at least three planetary gears and a sun gear to rotate relative to the fixed inner toothed disc 1 to output the torque.
The utility model discloses a big drive ratio gear reducer of single-stage's drive ratio scope is 50-330, and transmission efficiency can reach 0.70-0.85, can provide bigger drive ratio and more selection ranges in limited space, under same motor torque input condition, compares with harmonic reducer ware, can export unanimous or bigger moment.
In one embodiment, the fixed inner gear disc 1 is provided with a central through hole, and inner teeth for meshing with at least three planet gears are provided on an inner wall of the central through hole, forming the second inner gear ring 17. The first ring gear 18 and the second ring gear 17 enclose a reducer cavity, and the sun gear 1 and at least three planet gears are arranged in the reducer cavity. A connection hole for connecting with a torque output device is provided at the bottom of the cup-shaped housing 10, and the connection hole includes a screw hole and the like.
The planet wheel shaft 8 is rotationally connected with a central hole of the planet gear 3, and the front support plate 2 and the rear support plate 7 are respectively connected with two ends of the planet wheel shaft 8. The front support plate 2 and the rear support plate 7 function as a planet carrier, and the planet wheel shaft 8 can be rotationally connected with a central hole of the planet gear 3 through a bearing. When at least three planetary gears revolve, the front support plate 2 and the rear support plate 7 rotate by themselves.
In one embodiment, the sun gear 4 includes: gear body 41 and input shaft 42, gear body 41 and input shaft 42 are fixed connection. The bottom end of the cup-shaped housing 10 is provided with a mounting through hole which is communicated with and coaxial with the first ring gear 18, an input shaft 42 is rotatably connected with the mounting through hole, and the input shaft 42 is used for inputting external torque. The center shaft includes: and the connecting shaft 43 is fixedly connected with the gear body 41. The input shaft 42, the connecting shaft 43, and the gear body 41 may be integrally formed. The gear body 41 is located between the connecting shaft 43 and the input shaft 42, and the outer diameter of the gear body 41 is larger than the diameters of the connecting shaft 43 and the input shaft 42. The input shaft 42 can be connected with a motor, the input shaft 42 rotates relative to the fixed inner fluted disc 1 under the action of external force, and the cup-shaped shell 10 outputs low-speed rotation action to realize the speed reduction effect.
In one embodiment, the front and rear support plates 2 and 7 are provided with a first central mounting through hole and a second central mounting through hole, respectively, with the connecting shaft 43 being in clearance fit with the first central mounting through hole and the second central mounting through hole being in clearance fit with the input shaft 42. The fixed inner fluted disc 1 is positioned between the cup-shaped shell 10 and the front support plate 2, and the rear support plate 7 is positioned in a cavity of the speed reducer.
Every planetary gear 3 is equipped with 2I bearings 5 in, is equipped with round pin axle 8 in the I bearing 5, and 8 overcoat of round pin axle have a round pin axle sleeve 6, and the round pin axle sleeve is located between 2I bearings 5, and round pin axle 8 is connected with rear support 7 and front support 2 through shaft hole cooperation and threaded connection, sets up porose circlip 11 in planetary gear 3's the centre bore. The planet gear 3 is respectively meshed with the sun gear 4, the second inner gear ring 17 of the fixed inner gear disc 1 and the first inner gear ring 18 of the cup-shaped shell 10, the planet gear 3, the sun gear 4, the second inner gear ring 17 and the first inner gear ring 18 are all modified gears to form a gear transmission pair, and the surfaces of the gears are coated with wide-temperature aviation lubricating grease.
The input shaft 42 is rotatably connected to the mounting through hole by a bearing. The second bearing 9 is arranged on one side of the central gear 4, the second bearing 9 is arranged in an installation through hole on the cup-shaped shell 10, and the connecting shaft 43 on the left side of the central gear 4 is in small clearance fit with the central inner hole of the front support plate 2. The outer edge of the fixed inner fluted disc 1 is provided with a mounting hole for mounting and fixing the inner fluted disc, and the mounting hole comprises a through hole, a threaded hole and the like.
The single-stage large transmission ratio gear reducer of the utility model has fewer part types and numbers, and most of parts such as the cup-shaped shell 10, the central gear and the like are of hollow structures, so that the light weight can be realized on the premise of the same volume and performance; the module of single-stage big drive ratio gear reducer's planetary gear is 2 to 3 times of the harmonic gear of same reduction ratio and overall dimension, and great module is favorable to improving the vice transmission rigidity and bearing capacity of transmission, and the utility model discloses a flexible component in the harmonic gear transmission does not exist among the single-stage big drive ratio gear reducer, and life is longer, the maintenance cost is lower.
The planetary gear of the single-stage large transmission ratio gear reducer has a larger module than that of the harmonic gear, so that the machining manufacturability can be improved, and a special small-module machining tool is not needed. At least one planetary gear is evenly distributed along the circumferential direction of the sun gear. As shown in fig. 3, three planetary gears may be provided, and the planetary gear 3, the planetary gear 15 and the planetary gear 16 may realize simultaneous meshing of three pairs of gear pairs, so as to reduce transmission gaps and improve transmission accuracy.
In one embodiment, the number of teeth of the planetary gears 3, the sun gear 4, the first ring gear 18, and the second ring gear 17, etc. may be designed according to parameters such as gear ratios. The single-stage large-transmission-ratio gear reducer is a single-stage large-reduction-ratio gear reducer with a reduction ratio of 50-330. The first inner gear ring 18, the second inner gear ring 17 and the at least three planet gears form a gear transmission pair, the first inner gear ring 18, the second inner gear ring 17 and the at least three planet gears can be all deflection gears, and deflection is adopted to ensure that the center distances of the gear pairs are matched.
The method of machining a gear by changing the relative position of a tool and the gear to be machined is called a displacement correction method, and the gear machined by the displacement correction method is called a displacement gear and includes displacements such as tangential displacement and radial displacement. For example, the first ring gear 18 and the second ring gear 17 and at least three planetary gears have a module of 0.1 to 5 and a coefficient of variation of 0.01 to 3. The surfaces of the first and second ring gears 18 and 17 and the at least three planetary gears may be coated with an aviation grease, such as a wide temperature aviation grease or the like.
The single-stage large-transmission-ratio gear reducer in the embodiment can provide a larger transmission ratio in a limited space, the reduction ratio is generally 50-330, the transmission ratio is large, and the selection range is wide; the transmission ratio consistent with or larger than that of the harmonic gear drive type speed reducer can be provided under the same volume, so that the scheme can output consistent or larger torque compared with the harmonic gear drive type speed reducer under the condition of the same motor torque input; the module of the planetary gear is 2 to 3 times of that of a harmonic gear with the same reduction ratio and the same external dimension, the larger module is beneficial to improving the transmission rigidity and the bearing capacity of the transmission pair, and the scheme has no flexible element in harmonic gear transmission, so that the service life is longer, and the maintenance cost is lower;
in the single-stage large transmission ratio gear reducer in the embodiment, the planet gear has a larger module compared with the harmonic gear, the machining manufacturability can also be improved, and a special small module machining tool is not needed; by using at least three planetary gears, the transmission clearance can be reduced, and the transmission rigidity and the bearing capacity can be increased; the threaded hole formed in the cup-shaped shell is convenient to connect with driven equipment, and the threaded hole formed in the fixed inner fluted disc is convenient to install on any base for fixing; the part type and quantity are less, and weight is lighter, and reliability and life are high, convenient to detach and maintenance.
The single-stage large transmission ratio gear reducer in the embodiment can replace a harmonic gear reducer, obviously improve the transmission rigidity and the bearing capacity, prolong the service life and reduce the processing and manufacturing cost.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated. The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
The above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A single stage high ratio gear reducer comprising:
the device comprises at least three planetary gears, a sun gear, a cup-shaped shell and a fixed inner fluted disc; the central gear is an external gear, and the cup-shaped shell and the fixed internal fluted disc are respectively provided with a first internal gear ring and a second internal gear ring; the sun gear, the first inner gear ring and the second inner gear ring are coaxially arranged and are respectively and simultaneously meshed with the at least three planetary gears; the cup-shaped shell is used for outputting the output torque of the single-stage large transmission ratio gear reducer.
2. A single stage high ratio gear reducer according to claim 1,
the fixed inner fluted disc is provided with a central through hole, and inner teeth which are used for being meshed with the at least three planetary gears are arranged on the inner wall of the central through hole to form a second inner gear ring; the first inner gear ring and the second inner gear ring enclose a reducer cavity, and the sun gear and the at least three planetary gears are arranged in the reducer cavity.
3. A single stage high ratio gear reducer according to claim 2,
the sun gear includes: a gear body and an input shaft; the gear body is fixedly connected with the input shaft; the bottom end of the cup-shaped shell is provided with a coaxial mounting through hole communicated with the first inner gear ring, and the input shaft is rotatably connected with the mounting through hole; wherein the input shaft is used for inputting the external torque.
4. A single stage high ratio gear reducer according to claim 3 including:
the front support plate, the rear support plate and the planet wheel shaft; the planet wheel shaft is rotationally connected with a central hole of the planet gear, and the front support plate and the rear support plate are respectively connected with two ends of the planet wheel shaft.
5. A single stage high ratio gear reducer according to claim 4,
the center shaft includes: a connecting shaft; the connecting shaft is fixedly connected with the gear body, the gear body is positioned between the connecting shaft and the input shaft, and the outer diameter of the gear body is larger than the diameters of the connecting shaft and the input shaft; the front support plate and the rear support plate are respectively provided with a first central mounting through hole and a second central mounting through hole; the connecting shaft is in clearance fit with the first center mounting through hole, and the second center mounting through hole is in clearance fit with the input shaft; the fixed inner fluted disc is positioned between the cup-shaped shell and the front support plate, and the rear support plate is positioned in the cavity of the speed reducer.
6. A single stage high ratio gear reducer according to claim 5,
the input shaft is rotatably connected with the mounting through hole through a bearing; the planet wheel shaft is rotationally connected with the central hole of the planet gear through a bearing.
7. A single stage high ratio gear reducer according to claim 5,
the input shaft, the connecting shaft and the gear body are integrally formed.
8. A single stage high ratio gear reducer according to claim 1,
the bottom of the cup-shaped shell is provided with a connecting hole for connecting with torque output equipment; wherein, the connecting hole includes: a threaded bore.
9. A single stage high ratio gear reducer according to claim 1,
the edge of fixed internal fluted disc is provided with the mounting hole, wherein, the mounting hole includes: through holes or threaded holes.
10. A single stage large ratio gear reducer according to any of claims 1 to 9,
the number of the planetary gears is multiple, and the plurality of the planetary gears are uniformly distributed along the circumferential direction of the sun gear;
the reduction ratio of the single-stage large-transmission-ratio gear reducer is 50-330.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920310921.6U CN210034303U (en) | 2019-03-12 | 2019-03-12 | Single-stage large transmission ratio gear reducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920310921.6U CN210034303U (en) | 2019-03-12 | 2019-03-12 | Single-stage large transmission ratio gear reducer |
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| CN210034303U true CN210034303U (en) | 2020-02-07 |
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| CN201920310921.6U Active CN210034303U (en) | 2019-03-12 | 2019-03-12 | Single-stage large transmission ratio gear reducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854686A (en) * | 2019-03-12 | 2019-06-07 | 北京大信高科智能科技有限公司 | A kind of single-stage high drive ratio geared-down device |
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2019
- 2019-03-12 CN CN201920310921.6U patent/CN210034303U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854686A (en) * | 2019-03-12 | 2019-06-07 | 北京大信高科智能科技有限公司 | A kind of single-stage high drive ratio geared-down device |
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