CN111005987A - Differential cycloidal pin gear speed changing device - Google Patents
Differential cycloidal pin gear speed changing device Download PDFInfo
- Publication number
- CN111005987A CN111005987A CN201911203458.6A CN201911203458A CN111005987A CN 111005987 A CN111005987 A CN 111005987A CN 201911203458 A CN201911203458 A CN 201911203458A CN 111005987 A CN111005987 A CN 111005987A
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- China
- Prior art keywords
- teeth
- epicycloidal
- tooth
- gear
- cycloid
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/028—Gearboxes; Mounting gearing therein characterised by means for reducing vibration or noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
- F16H2001/327—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear with orbital gear sets comprising an internally toothed ring gear
Abstract
The invention relates to the technical field of mechanical transmission, and particularly discloses a differential cycloid pinwheel speed change device which comprises a cycloid gear, wherein a mounting cavity for mounting the cycloid gear is arranged on a machine body of the speed change device, the cycloid gear is eccentrically driven by an input shaft in the speed change device, first epicycloidal teeth are arranged on the outer peripheral surface of the cycloid gear, first hypocycloidal teeth are arranged on the inner wall, corresponding to the first epicycloidal teeth, of the mounting cavity, a concave cavity for mounting an output shaft of the speed change device is arranged on the cycloid gear, first rolling needles and first grooves for mounting the first rolling needles are arranged on the concave cavity, each first rolling needle is surrounded to form second hypocycloidal teeth, second epicycloidal teeth are arranged on the surface, opposite to the first rolling needles, of the output shaft, and the number of tooth profiles of the first epicycloidal teeth is larger than or smaller than that of the second epicycloidal teeth. With the above structure, a differential cycloid pin gear transmission device having a low gear ratio with a speed change structure composed of two-stage cycloid gears is provided.
Description
Technical Field
The invention relates to the technical field of mechanical transmission, in particular to a differential cycloid pin gear speed change device.
Background
At present, a transmission device applied to a precision servo mechanism of a robot, a precision machine tool, aerospace and the like is required to have the characteristics of high transmission precision, high transmission rigidity, large transmission ratio, high transmission efficiency, small volume, light weight, small transmission return difference, small rotational inertia of a rotating part and the like.
The prior art discloses a 201710375741.1 patent named as 'double cycloid pin gear speed reduction ratio difference speed reduction cycloid pin gear speed reducer', which discloses that double cycloid gears are installed in a large pin gear shell and a small pin gear shell which correspond to each other, large and small cycloid surfaces of the double cycloid gears are meshed through needle rollers installed on the large pin gear shell and the small pin gear shell, the large pin gear shell and the small pin gear shell are installed together through bearings, an eccentric shaft is respectively assembled with the large pin gear shell, the double cycloid gear and the small pin gear shell through the bearings, the double cycloid gears perform cycloid movement in the large pin gear shell and the small pin gear shell when the eccentric shaft rotates, and because the large cycloid gear and the small cycloid gear have different speed reduction ratios, and the two cycloid gears are fixed together, the pin gear shell corresponding to the large cycloid gear and the pin gear shell corresponding to the small cycloid gear have a rotation speed difference, and speed reduction is formed by utilizing the rotation speed difference.
The double cycloid wheels are meshed with the roller pins arranged on the large needle gear shell and the small needle gear shell, and the technical scheme has the advantages of only high transmission ratio, no low transmission ratio and small application range.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a differential cycloid pin gear speed change device which is composed of two-stage cycloid gears and has a low transmission ratio.
In order to achieve the purpose, the invention adopts the technical scheme that: a differential cycloid pin gear speed change device comprises a cycloid gear, a mounting cavity for mounting the cycloid gear is arranged on a machine body of the speed change device, wherein the cycloid gear is eccentrically driven by an input shaft in the speed change device, first epicycloidal teeth are arranged on the outer peripheral surface of the cycloid gear, first hypocycloidal teeth are arranged on the inner wall, corresponding to the first epicycloidal teeth, of the mounting cavity, tooth profile number of the first hypocycloidal teeth is larger than that of the first epicycloidal teeth to form meshed cycloid movement, a concave cavity for embedding an output shaft of the speed change device is arranged on the cycloid gear, first rolling pins and first grooves for mounting the first rolling pins are uniformly distributed along the circumferential direction of the concave cavity, the part of each first rolling pin exposed out of the first groove is surrounded to form second hypocycloidal teeth, and second epicycloidal teeth are arranged on the surface, opposite to the first rolling pins, of the output shaft, the number of the second hypocycloidal teeth is larger than that of the second epicycloidal teeth to form meshed cycloidal motion, and the number of the first epicycloidal teeth is larger than or smaller than that of the second epicycloidal teeth.
In the above technical scheme, the first epicycloidal tooth and the first hypocycloidal tooth constitute a primary speed change, the second epicycloidal tooth and the second roller pin constitute a secondary speed change, the number of tooth profiles of the first epicycloidal tooth may be larger than that of the second epicycloidal tooth or smaller than that of the second epicycloidal tooth, the output shaft is driven by the cycloidal gear,
the "-" input and output directions are reversed, which is a low ratio. .
As a further arrangement of the present invention, the inner circumferential surface of the mounting cavity is provided with second needle rollers uniformly distributed along the circumferential direction thereof and second grooves for mounting the second needle rollers, the portions of the respective second needle rollers exposed outside the second grooves surround to form the first hypocycloid teeth, and the first hypocycloid teeth and the second needle rollers form a meshed cycloidal motion.
As a further arrangement of the present invention, the first hypocycloidal tooth is integrally provided with the machine body.
Among the above-mentioned technical scheme, first hypocycloid tooth can be directly set up on the inner wall of installation cavity, with organism an organic whole setting, also can constitute through the second kingpin, and the range of application is wide.
As a further development of the invention, the number of teeth of the first hypocycloidal tooth is 1 more than the number of teeth of the first epicycloidal tooth, and the number of teeth of the second hypocycloidal tooth is 1 more than the number of teeth of the second epicycloidal tooth.
In the above technical scheme, the number of the first hypocycloidal teeth may be 1-n more than the number of the first epicycloidal teeth, the number of the second hypocycloidal teeth is 1-n more than the number of the second epicycloidal teeth, preferably, the number of the first hypocycloidal teeth is 1 more than the number of the first epicycloidal teeth, and the number of the second hypocycloidal teeth is 1 more than the number of the second epicycloidal teeth, so that the deceleration is stable, the noise is small, and the service life is long.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a structural sectional view of embodiment 1 of the present invention;
FIG. 2 is an exploded view of the structure of embodiment 1 of the present invention;
FIG. 3 is an exploded view of the structure of embodiment 1 of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 1;
FIG. 5 is a cross-sectional view B-B of FIG. 1;
FIG. 6 is a structural sectional view of embodiment 2 of the present invention;
FIG. 7 is an exploded view of the structure of embodiment 2 of the present invention;
FIG. 8 is an exploded view of the structure of embodiment 2 of the present invention;
FIG. 9 is a cross-sectional view A-A of FIG. 6;
fig. 10 is a sectional view taken along line B-B of fig. 6.
Detailed Description
Detailed description of the inventionas shown in fig. 1 to 10, a differential cycloid pin gear transmission device includes a cycloid gear 1, a mounting cavity 21 for mounting the cycloid gear 1 is provided on a transmission body 2, wherein the cycloid gear 1 is eccentrically driven by an input shaft 3 of the transmission, a first epicycloidal tooth a1 is provided on an outer circumferential surface of the cycloid gear 1, a first hypocycloidal tooth a2 is provided on an inner wall of the mounting cavity 21 corresponding to the first epicycloidal tooth a1, a tooth profile number of the first hypocycloidal tooth a2 is larger than a tooth profile number of the first epicycloidal tooth a1 to constitute a meshed cycloid motion, a concave cavity 11 for fitting an output shaft 4 of the transmission is provided on the cycloid gear 1, first needle rollers 111 uniformly distributed along a circumferential direction thereof and first grooves 112 for mounting the first needle rollers 111 are provided on an inner circumferential surface of the concave cavity 11, a portion of each first needle roller 111 exposed outside the first groove 112 surrounds a second epicycloidal tooth 1, the surface of the output shaft 4 opposite to the first roller pin 111 is provided with a second epicycloidal tooth B2, the number of tooth profiles of the second hypocycloidal tooth B1 is larger than that of the second epicycloidal tooth B2 to form meshed cycloidal motion, and the number of tooth profiles of the first epicycloidal tooth A1 is larger than or smaller than that of the second epicycloidal tooth B2.
Cycloid gear 1: the tooth profile is a cycloidal disk-shaped or circular ring-shaped gear with an equidistant curve shape.
Hypocycloid: a moving circle is inscribed in a fixed circle to roll without sliding, and the track of a fixed point on the circumference of the moving circle is called hypocycloid.
Epicycloid: when a moving circle having a radius b rolls along the outer side of a fixed circle having a radius a without sliding, the locus of a point described by a point p on the circumference of the moving circle is called an epicycloid.
The components of the machine body 22, the input shaft 33, the cycloid gear 11 and the output shaft 44 need to be provided with some necessary bearings or rollers, roller holders, oil seals, sealing rings, connecting screws and the like, which are not described in detail herein, for convenience of installation, the machine body 22 may be a combined upper and lower structure, the first epicycloidal tooth a1 and the first hypocycloidal tooth a2 constitute a first-stage speed change, the second epicycloidal tooth B2 and the second rolling needle constitute a second-stage speed change, the number of tooth profiles of the first epicycloidal tooth a1 may be greater than that of the second epicycloidal tooth B2 or less than that of the second epicycloidal tooth B2, the output shaft 4 is driven by the cycloid gear 1,
the "-" input and output directions are reversed, which is a low ratio. .
In embodiment 1, as shown in fig. 1 to 5, the inner circumferential surface of the mounting cavity 21 is provided with second roller pins 211 uniformly distributed along the circumferential direction thereof and second grooves 212 for mounting the second roller pins 211, the portions of the respective second roller pins 211 exposed outside the second grooves 212 surround to form the first hypocycloidal tooth a2, and the first hypocycloidal tooth a1 and the second roller pins 211 form a meshed cycloidal motion.
The first hypocycloid tooth a2 may be directly disposed on the inner wall of the mounting cavity 21, and integrally disposed with the machine body 2, or may be formed by the second needle roller 211, which has a wide application range.
The number of the first hypocycloidal teeth a2 is 1 larger than that of the first epicycloidal teeth a1, and the number of the second hypocycloidal teeth B1 is 1 larger than that of the second epicycloidal teeth B2.
The number of the tooth profiles of the first hypocycloid tooth a2 can be 1-n more than that of the first epicycloid tooth a1, the tooth profile of the second hypocycloid tooth B1 is 1-n more than that of the second epicycloid tooth B2, preferably, the tooth profile of the first hypocycloid tooth a2 is 1 more than that of the first epicycloid tooth a1, the tooth profile of the second hypocycloid tooth B1 is 1 more than that of the second epicycloid tooth B2, when the difference is greater than 1, such as 2 and 3 … …, and so on, when the difference is not 1, the transmission ratio formula needs to be adjusted accordingly, the deceleration is stable, the noise is small, and the service life is long.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.
Claims (4)
1. The utility model provides a differential cycloid pinwheel speed change gear, includes the cycloid gear, and the installation cavity that supplies the cycloid gear installation sets up on speed change gear's organism, and wherein, the cycloid gear is by the eccentric drive of the input shaft among the speed change gear, be provided with first epicycloid tooth, its characterized in that on the outer peripheral face of cycloid gear: the inner wall of the mounting cavity corresponding to the first epicycloidal teeth is provided with first hypocycloidal teeth, the number of tooth profiles of the first hypocycloidal teeth is larger than that of the first epicycloidal teeth to form meshed cycloidal motion, the cycloidal gear is provided with a concave cavity for the output shaft of the speed change device to be embedded, the inner circumferential surface of the concave cavity is provided with first roller pins and first grooves for the first roller pins to be mounted, the parts of the first roller pins exposed out of the first grooves are surrounded to form second hypocycloidal teeth, the surface of the output shaft opposite to the first roller pins is provided with second epicycloidal teeth, the number of tooth profiles of the second hypocycloidal teeth is larger than that of the second epicycloidal teeth to form meshed cycloidal motion, and the number of tooth profiles of the first epicycloidal teeth is larger than or smaller than that of the second epicycloidal teeth.
2. The differential cycloidal pin gear transmission of claim 1 including: the inner peripheral surface of the mounting cavity is provided with second roller pins and second grooves for mounting the second roller pins, the second roller pins are uniformly distributed along the circumferential direction of the mounting cavity, the parts of the second roller pins exposed out of the second grooves surround to form first hypocycloid teeth, and the first hypocycloid teeth and the second roller pins form meshed cycloidal motion.
3. The differential cycloidal pin gear transmission of claim 1 including: the first hypocycloid teeth and the machine body are integrally arranged.
4. The differential cycloidal pin gear shifting device of claim 1, 2 or 3, further comprising: the number of teeth of the first hypocycloidal tooth is 1 more than the number of teeth of the first epicycloidal tooth, and the number of teeth of the second hypocycloidal tooth is 1 more than the number of teeth of the second epicycloidal tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911203458.6A CN111005987A (en) | 2019-11-29 | 2019-11-29 | Differential cycloidal pin gear speed changing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911203458.6A CN111005987A (en) | 2019-11-29 | 2019-11-29 | Differential cycloidal pin gear speed changing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111005987A true CN111005987A (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911203458.6A Pending CN111005987A (en) | 2019-11-29 | 2019-11-29 | Differential cycloidal pin gear speed changing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111005987A (en) |
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2019
- 2019-11-29 CN CN201911203458.6A patent/CN111005987A/en active Pending
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