CN118391404A

CN118391404A - Transmission device

Info

Publication number: CN118391404A
Application number: CN202410603087.5A
Authority: CN
Inventors: 陈宇昊; 马永洲
Original assignee: Ningbo Hansheng Transmission Technology Co ltd
Current assignee: Ningbo Hansheng Transmission Technology Co ltd
Priority date: 2023-05-19
Filing date: 2024-05-15
Publication date: 2024-07-26
Also published as: WO2024240041A1

Abstract

The present invention provides a transmission device comprising: an inner gear ring having a plurality of inner teeth; the planetary gear comprises a plurality of rolling pins and discs at two sides of the rolling pins, wherein the rolling pins are circumferentially arranged, the rolling pins are meshed with the inner teeth, and the number of the planetary gears is more than or equal to 2; the input flange is positioned on the input side of the planet wheel, and the output flange is positioned on the output side of the planet wheel; a plurality of planet holes are formed in the input flange and the output flange; the planetary shaft is arranged at the central line position of the planetary hole on the input flange and the output flange, and the planetary gear is arranged on the planetary shaft and rotates around the central axis of the planetary hole; the planetary gear is arranged on a disc of the planetary gear or a planetary shaft; and the input shaft is provided with an input gear which is meshed with the planetary gear. The invention solves the problems of easy abrasion, low transmission precision, low rigidity and low shock resistance of the traditional involute gear.

Description

Transmission device

The present application claims priority from China patent number 2023105684707, filed 5, 19 of 2023. The entire contents of this application are incorporated herein by reference.

Technical Field

The invention relates to the technical field of mechanical transmission, in particular to a transmission device.

Background

At present, a conventional planetary reduction gear is used as a sun gear, a planet gear and a first annular gear, and although a planetary reduction mechanism has been in the past for hundreds of years, the following reasons exist, so that a new application field is broken through: because the backlash is larger when the involute teeth are meshed, the transmission error is large, and the involute teeth are difficult to directly use for precise transmission; the single-stage transmission of the speed reducer with the planetary structure has small transmission speed ratio, and the speed reducer with the large speed ratio can be realized by multistage serial transmission, so that the size is larger; the involute teeth are easy to wear when meshed, have low transmission precision and low rigidity and impact resistance.

Disclosure of Invention

The invention solves the problems of easy abrasion, low transmission precision, low rigidity and low shock resistance of the traditional involute gear.

In order to solve the above problems, the present invention provides a transmission device, including: an inner gear ring having a plurality of inner teeth; the planetary gear comprises a plurality of rolling pins and discs at two sides of the rolling pins, wherein the rolling pins are circumferentially arranged, the rolling pins are meshed with the internal teeth, and the number of the planetary gears is more than or equal to 2; the planetary gear comprises an input flange and/or an output flange, wherein the input flange is positioned on the input side of the planetary gear, the output flange is positioned on the output side of the planetary gear, and a plurality of planetary holes are formed in the input flange and/or the output flange; the planetary shaft is arranged at the central line position of a planetary hole on the input flange and/or the output flange, the planetary shaft is arranged at the central axis of the planetary gear, and the planetary gear rotates around the central axis of the planetary shaft; the planetary gear is arranged on the planetary wheel disc or the planetary shaft; the input shaft is provided with an input gear, and the input gear is meshed with the planetary gear.

The technical effect achieved after the technical scheme is adopted is as follows: the inner gear ring is meshed with the needle roller to realize transmission, wherein pure rolling friction is adopted between the needle roller and the inner teeth of the inner gear ring, so that compared with involute tooth friction, the involute tooth friction is smaller, and the precision life is longer.

Further, two discs of the planet wheel are arranged on two sides of the internal tooth, and external teeth are machined on at least one disc.

The technical effect achieved after the technical scheme is adopted is as follows: the planetary gear is more compact in structure and is easier to carry out compact design according to the requirement of the transmission speed ratio, so that the whole structure is flatter. The external teeth are machined on at least one disc, so that the two-stage transmission volume can be smaller.

Further, a first planetary external gear is arranged on the planetary shaft and meshed with the input gear.

The technical effect achieved after the technical scheme is adopted is as follows: when the number of teeth machined on the discs on two sides of the planet wheel can not meet the transmission speed ratio requirement, the first planet external gear can be arranged on the planet shaft, so that a larger range of designed transmission speed ratio can be obtained.

Further, a needle roller sliding sleeve is arranged on the needle roller, and the needle roller sliding sleeve is meshed with the inner teeth.

The technical effect achieved after the technical scheme is adopted is as follows: the rolling needle sliding sleeve realizes a pure rolling effect when meshed with the internal teeth, and plays a role in protecting the rolling needle, so that the rolling needle is prevented from being rubbed, and the service life of the rolling needle is prolonged.

Further, the planetary shaft is integrated with the planetary gear, and the planetary shaft is arranged at the position of the planetary hole of the input flange and/or the output flange through a bearing.

The technical effect achieved after the technical scheme is adopted is as follows: the planetary shaft can be positioned and installed on the input flange and/or the output flange through the bearing; and the planetary shaft rotates in the planetary holes of the input flange and/or the output flange, namely, the planetary shaft and the planetary wheel rotate integrally and jointly at the moment, and the input gear on the input shaft can drive the planetary gear to realize planetary motion.

Further, the planet wheel is arranged on the planet shaft through a bearing; the planetary shaft is fixedly connected with the planetary hole of the input flange, and/or the planetary shaft is fixedly connected with the planetary hole of the output flange.

The technical effect achieved after the technical scheme is adopted is as follows: the planet axle is fixed with the planet hole position of input flange and realizes the location installation, and the planet wheel can rotate relative to the planet axle, when processing has the gear on the disc of planet wheel both sides, the input gear on the input shaft can drive the gear on the planet wheel and realize planetary motion.

Further, the output flange is arranged in the inner gear ring through a bearing.

The technical effect achieved after the technical scheme is adopted is as follows: the annular gear can rotate relative to the output flange, the annular gear can be supported on the output flange through the bearing, the structure is more stable, and at the moment, the needle rollers can push the inner teeth of the annular gear to rotate stably.

Further, the planet gears revolve around the center line of the ring gear while rotating around the planet shaft.

Further, the transmission device further includes: the input side planetary gear is positioned on one side, far away from the planet wheel, of the input flange and is provided with an inner hole, and the input side planetary gear is arranged on the planet shaft, so that the design of transmission with more stages and larger transmission speed ratio is realized. The number of the input side planetary gears is 2 or more.

In summary, each of the above technical solutions of the present application may have one or more of the following advantages or beneficial effects: i) The inner gear ring is meshed with the needle roller to realize transmission, wherein pure rolling friction is adopted between the needle roller and the inner teeth of the inner gear ring, so that compared with involute tooth friction, the involute tooth friction is smaller, and the precision life is longer; ii) the needle roller is meshed with the internal teeth for transmission, and the tolerance size of the needle roller sliding sleeve is adjusted, so that the backlash meshed with the internal teeth is smaller, the transmission precision is high, and the needle roller can be used for precise transmission; iii) Compared with involute tooth profile engagement, the roller pin/roller pin sliding sleeve engagement is adopted, and the diameter of the roller pin is larger than the modulus of the tooth, so that the bearing capacity, the rigidity and the shock resistance can be greatly improved.

Drawings

FIG. 1 is a schematic diagram of a transmission device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another transmission device according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a further transmission device according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 3;

FIG. 5 is a cross-sectional view taken along the direction A-A in FIG. 4;

FIG. 6 is a cross-sectional view taken along the direction C-C in FIG. 4;

fig. 7 is a sectional view taken along the direction D-D in fig. 4.

Reference numerals illustrate:

100-transmission device; 110-an inner gear ring; 120-planet wheels; 121-rolling pins; 122-discs; 124-a needle roller sliding sleeve; 130-an input flange; 140-an output flange; 150-input side planetary gears; 151-a first gear; 152-a second gear; 160-planetary shaft; 161-roller; 170-a drive shaft; 180-input shaft; 181-a third gear; 182-fourth gear; 183-first bearing; 184-a second bearing; 185-input gear; 190-fasteners.

Detailed Description

The invention aims to provide a transmission device which can greatly improve bearing capacity, rigidity and shock resistance, improve transmission precision and prolong the service life of the precision.

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

First embodiment

Referring to fig. 1-2, the present invention provides a transmission 100 comprising: an inner gear ring 110, the inner gear ring 110 having a plurality of inner teeth; the planetary gears 120, the planetary gears 120 comprise a plurality of rolling pins 121 and discs 122 at two sides of the rolling pins 121, the rolling pins 121 are meshed with the internal teeth, and the number of the planetary gears 120 is more than or equal to 2; an input flange 130 and/or an output flange 140, wherein the input flange 130 is positioned on the input side of the planet 120, the output flange 140 is positioned on the output side of the planet 120, and a plurality of planet holes are arranged on the input flange 130 and/or the output flange 140; a planetary shaft 160, the planetary shaft 160 being disposed at a planetary hole center line position of the input flange 130 and/or the output flange 140, the planetary shaft 160 being disposed at a planetary gear 120 center axis, the planetary gear 120 rotating around the center axis of the planetary shaft 160; a planetary gear provided on the disc 122 of the planetary gear 120 or on the planetary shaft 160; the input shaft 180, an input gear 185 is provided on the input shaft 180, and the input gear 185 is meshed with the planetary gears.

In this embodiment, the ring gear 110 is meshed with the needle roller 121 to realize transmission, wherein the needle roller 121 and the internal teeth of the ring gear 110 have pure rolling friction, so that compared with involute tooth friction, the friction is smaller, and the precision life is longer.

Preferably, the number of teeth of the ring gear 110 is 15 to 30, for example 22, which is not limited herein.

Preferably, the number of needle rollers 121 in each planet 120 is 6 to 8, for example 7, without limitation.

In a specific embodiment, both discs 122 of the planet 120 are externally toothed, the discs 122 are disposed on opposite sides of the internal teeth, and external teeth are machined on at least one disc 122.

It should be noted that, the structure of the planet 120 is more compact, and it is easier to make a compact design according to the requirement of the transmission ratio, so that the overall structure is flatter. At least one of the discs 122 is externally toothed to allow for a smaller two-stage drive volume.

Second embodiment

Referring to fig. 1-2, a first planetary external gear is provided on the planetary shaft 160 to mesh with an input gear 185.

It should be noted that, when the number of teeth machined on the discs 122 on both sides of the planet 160 cannot meet the transmission ratio requirement, the first planetary external gear may be set on the planet shaft 160, and the disc 122 with external teeth may be replaced by the first planetary external gear, so as to obtain a larger range of designed transmission ratio.

In any of the above embodiments, the needle roller 121 is provided with the needle roller sliding sleeve 124, and the needle roller sliding sleeve 124 is engaged with the internal teeth.

It should be noted that, when the needle roller sliding sleeve 124 is meshed with the inner teeth, a pure rolling effect is achieved, and meanwhile, the needle roller 121 is protected, so that the needle roller 121 is prevented from being rubbed, and the service life of the needle roller 121 is prolonged.

In a particular embodiment, the planet axle 160 is integral with the planet 120, and the planet axle 160 is journaled in the planet aperture position of the input flange 130 and/or the output flange 140.

The planetary shaft 160 can be positioned and mounted on the input flange 130 and/or the output flange 140 through bearings; in addition, the planetary shaft 160 rotates in the planetary hole of the input flange 130 and/or the output flange 140, that is, the planetary shaft 160 and the planetary gear 120 rotate together as a whole, and the input gear 185 on the input shaft 180 can drive the planetary gear to realize planetary motion.

In a particular embodiment, the planet 120 is disposed on the planet shaft 160 by bearings; the planet axle 160 is fixedly connected to the planet aperture of the input flange 130 and/or the planet axle 160 is fixedly connected to the planet aperture of the output flange 140.

It should be noted that, the planetary shaft 160 and the planetary hole of the input flange 130 are fixed to realize positioning and installation, the planetary gear 120 can rotate relative to the planetary shaft 160, and when gears are machined on the discs 122 at two sides of the planetary gear 120, the input gear 185 on the input shaft 180 can drive the gears on the planetary gear 120 to realize planetary motion.

For example, the planet 120 is arranged on the planet shaft 160 by means of cylindrical roller bearings.

In a particular embodiment, the output flange 140 is disposed within the ring gear 110 via bearings.

It should be noted that, when the ring gear 110 is fixed, the output flange 140 may be used to output power.

In a particular embodiment, the input flange 130 is disposed within the ring gear 110 via bearings.

It should be noted that, the input flange 130 can rotate relative to the ring gear 110, the input flange 130 and the output flange 140 are integrally connected as a planet carrier through the fastener 190, and when the ring gear 110 is fixed, the planet carrier outputs power.

Preferably, the input flange 130 and the output flange 140 are disposed in the ring gear 110 by angular contact ball bearings of opposite directions, so as to be able to withstand both axial and radial forces.

In a specific embodiment, the planet gears 120 revolve around the centerline of the ring gear 110 while rotating around the planet shaft 160.

Third embodiment

As shown in fig. 3-7, the transmission 100 further includes: the input side planetary gear 150, the input side planetary gear 150 is located on the side of the input flange 130 far from the planetary gear 120, the input side planetary gear 150 has an inner hole, and is mounted on the planetary shaft 160, so that the design of a larger number of steps and a larger transmission speed ratio is realized. The number of input-side planetary gears 150 is 2 or more.

In the present embodiment, the input side planetary gear 150 is of a double-tooth structure, and is composed of the first gear 151 and the second gear 152, and the purpose of this embodiment is to enable a transmission design of a larger number of stages and a higher transmission ratio. The input side planetary gear 150 is mounted on the planetary shaft 160 through a roller 161, and when the driving shaft 170 is driven by a motor (not shown), a third gear 181 on the driving shaft 170 is engaged with the second gear 152, and the driving gear 152 rotates, and since the first gear 151 and the second gear 152 are of a double-tooth structure, the first gear 151 drives a fourth gear 182, and the fourth gear 182 is fixedly connected to the input shaft 180 to rotate in synchronization with the input shaft 180. When the input shaft 180 rotates, the input gear 185 on the input shaft 180 drives the planet gears 120 to do planetary motion, and the planet gears 120 are meshed with the annular gear 110, so that the purpose of speed reduction is achieved.

In a specific embodiment, as shown in fig. 7, the side of the input flange 130 remote from the planets 120 has a planetary groove that accommodates the first gear 151 and the fourth gear 182, making the axial dimensions of the input side planetary gear 150 and the input flange 130 more compact.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A transmission, comprising:

an inner gear ring having a plurality of inner teeth;

the planetary gear comprises a plurality of rolling pins and discs at two sides of the rolling pins, wherein the rolling pins are circumferentially arranged, the rolling pins are meshed with the internal teeth, and the number of the planetary gears is more than or equal to 2;

The input flange is positioned on the input side of the planet wheel, and the output flange is positioned on the output side of the planet wheel; a plurality of planet holes are formed in the input flange and/or the output flange;

the planetary shaft is arranged at the central line position of the planetary hole on the input flange and/or the output flange, and the planetary wheel is arranged on the planetary shaft and rotates around the central axis of the planetary hole;

the planetary gear is arranged on a disc of the planetary gear or the planetary shaft;

the input shaft is provided with an input gear, and the input gear is meshed with the planetary gear.

2. The transmission according to claim 1, wherein two of the discs of the planet are arranged on both sides of the internal teeth, and external teeth are machined on at least one disc.

3. The transmission of claim 1, wherein the planetary shaft is provided with a first planetary external gear that meshes with the input gear.

4. The transmission according to claim 1, wherein a needle roller sliding sleeve is provided on the needle roller, and the needle roller sliding sleeve is engaged with the internal teeth.

5. A transmission according to claim 1, wherein the planet shafts are integral with the planet wheels, the planet shafts being arranged at planet hole locations of the input flange and/or the output flange by means of bearings.

6. The transmission of claim 1, wherein the planet gears are disposed on the planet shaft by bearings; the planetary shaft is fixedly connected with the planetary hole of the input flange, and/or the planetary shaft is fixedly connected with the planetary hole of the output flange.

7. The transmission of claim 1, wherein the output flange is disposed within the annulus via a bearing.

8. The transmission of claim 1, wherein the planet gears revolve around the ring gear centerline while rotating around the planet shaft.