CN216078049U

CN216078049U - Overload protection mechanism and transmission system

Info

Publication number: CN216078049U
Application number: CN202122088829.XU
Authority: CN
Inventors: 刘新; 黄瑞日
Original assignee: Shenzhen Haiyi Zhixin Technology Co Ltd
Current assignee: Shenzhen Haiyi Zhixin Technology Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-18
Anticipated expiration: 2031-08-31

Abstract

The utility model provides an overload protection mechanism and a transmission system, wherein the overload protection mechanism comprises an annular rigid gear, and the rigid gear comprises external teeth arranged on the outer peripheral surface of the annular rigid gear and internal teeth arranged on the inner peripheral surface of the annular rigid gear; the elastic member is arranged coaxially with the rigid gear on a radially inner side of the rigid gear, and includes an elastic meshing portion including a plurality of elastic arms equally spaced apart in a circumferential direction, an outer circumferential surface of each of the plurality of elastic arms being provided with elastic outer teeth meshing with inner teeth of the rigid gear, and each of the plurality of elastic arms being provided with a hollow structure penetrating in an extending direction of a central axis of the elastic member. The overload protection function is realized by adopting the engagement of the elastic component and the rigid gear, when the whole transmission system bears larger torque, the elastic component deforms so as to be separated from the engagement with the rigid gear, and slip and idle rotation are generated, so that the overload protection effect is realized on the whole transmission system.

Description

Overload protection mechanism and transmission system

Technical Field

The present invention relates generally to the field of transmission overload protection, and more particularly to an overload protection mechanism and a transmission system.

Background

The existing torque protection device/overload protection device generally protects gear transmission by increasing a spring or a plurality of gear combination elastic bodies to generate collapse, and the overload protection device adopting the mode has the problems of unstable movement mechanism, unsmooth mechanism, easy occurrence of jamming, very complex implementation mode and high cost.

Accordingly, there is a need to provide an overload protection mechanism to at least partially address the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

To at least partially solve the above problems, the present invention provides an overload protection mechanism including:

an annular rigid gear including external teeth provided on an annular outer peripheral surface and internal teeth provided on an annular inner peripheral surface;

an elastic member disposed coaxially with the rigid gear on a radially inner side thereof, the elastic member including an elastic meshing portion including a plurality of elastic arms equally spaced apart in a circumferential direction, an outer circumferential surface of each of the plurality of elastic arms being provided with elastic outer teeth meshing with inner teeth of the rigid gear, and each of the plurality of elastic arms being provided with a hollow structure penetrating in an extending direction of a central axis of the elastic member.

Optionally, the resilient engagement portion comprises three resilient arms equally spaced apart in a circumferential direction.

Optionally, the rigid gear is made of metal.

Optionally, the resilient member is made of plastic.

Optionally, a radial dimension of the hollow structure is greater than a radial dimension of the resilient outer teeth.

Optionally, the elastic member further includes a transmission gear disposed coaxially with the elastic meshing portion.

Optionally, the transmission gear and the elastic meshing part are integrally formed by injection molding.

Optionally, the overload protection mechanism further includes a rotating shaft, the elastic member is provided with a central hole penetrating along an extending direction of a central axis of the elastic member, and the rotating shaft penetrates through the central hole.

The utility model also provides a transmission system which comprises a driving motor, a driven assembly and the overload protection mechanism.

Optionally, the rigid gear is connected with the driving motor, and the elastic component is connected with the driven assembly.

According to the overload protection mechanism, the elastic component is meshed with the rigid gear to realize the overload protection function, when the whole transmission system bears large torque, the elastic component deforms to be separated from the meshing with the rigid gear, and slip and idle rotation are generated, so that the overload protection effect on a driven assembly is realized, the torque borne by the driving motor/motor cannot reach a locked-rotor state, and the overload protection effect on the whole transmission system is realized. The overload protection mechanism has the advantages of simple structure, low production cost and high production efficiency.

Drawings

The following drawings of embodiments of the utility model are included as part of the present invention for an understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model. In the drawings, there is shown in the drawings,

FIG. 1 is a perspective view of an overload protection mechanism according to a preferred embodiment of the present invention;

FIG. 2 is an exploded view of an overload protection mechanism according to a preferred embodiment of the present invention;

FIG. 3 is a front view of an overload protection mechanism according to a preferred embodiment of the present invention without overload;

fig. 4 is a front view of an overload protection mechanism according to a preferred embodiment of the present invention in the event of an overload.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the utility model may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the utility model.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the utility model. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

The present invention provides an overload protection mechanism, as shown in fig. 1 to 4, which includes an annular rigid gear 1 and an elastic member 2. The annular rigid gear 1 includes external teeth 11 provided on an annular outer peripheral surface and internal teeth 12 provided on an annular inner peripheral surface; the elastic member 2 is arranged coaxially with the rigid gear 1 on the radially inner side of the rigid gear 1, the elastic member 2 includes an elastic engaging portion including a plurality of elastic arms 21 equally spaced apart in the circumferential direction, an outer peripheral surface of each elastic arm 21 is provided with an elastic outer tooth 211 engaging with the inner tooth 12 of the rigid gear 1, and each elastic arm 21 is provided with a hollow structure 212 penetrating in the extending direction of the central axis of the elastic member. When the rigid gear 1 and the elastic component 2 are assembled, the elastic external teeth 211 of the elastic component 2 are meshed with the internal teeth 12 of the rigid gear 1, and when the transmitted torque is in a normal range, as shown in fig. 3, the internal teeth 12 of the rigid gear 1 and the elastic external teeth 211 of the elastic component 2 are in a normal meshed state, so that the rigid gear 1 and the elastic component 2 are ensured to synchronously rotate, and the normal operation of the device is ensured. When the torque exceeds the normal range and is in an overload state, as shown in fig. 4, the elastic arm 21 retracts inwards to enable the internal teeth 12 of the rigid gear 1 and the elastic external teeth 211 of the elastic component 2 to be in an abnormal meshing state, so that the rigid gear 1 and the elastic component 2 generate relative slip and cannot be in a synchronous rotation state or even in an idle rotation state, and the overload protection mechanism ensures that each transmission component and a driving system provided with the overload protection mechanism are protected by overload. Specifically, by providing the hollow structure 212 in each elastic arm 21, it can be ensured that, in an overspeed or overload state, the end portion (meshing portion) of the elastic arm located radially outside the hollow structure 212 is elastically deformed (the elastic external teeth 211 contract inward in the radial direction) so as to be out of the normal meshing state with the rigid gear 1.

Preferably, the elastic engagement portion may include three elastic arms 21 equally spaced apart in the circumferential direction. Alternatively, the elastic engagement portion may include four elastic arms 21 equally spaced apart in the circumferential direction. Specifically, the number and size of the elastic arms are set to ensure that the rigid gear is normally engaged with the elastic member to rotate synchronously under normal rotation speed/load conditions, while the radial end portions of the elastic arms are elastically deformed/contracted inward under overspeed/overload conditions so that slip occurs between the rigid gear and the elastic member to disengage from the normal engagement condition.

Further, the radial dimension of the hollow structure 212 is larger than the radial dimension of the elastic outer teeth 211. The dimensioning of the hollow structure 212 as large as possible contributes to the elastic deformation of the elastic arm 21 in the event of an overspeed/overload, and the dimensioning of the elastic outer toothing 211 and the inner toothing 12 of the rigid gear wheel 1 as small as possible contributes to the disengagement of the elastic outer toothing 211 from the engagement with the inner toothing 12 of the rigid gear wheel 1 in the event of an elastic deformation of the elastic arm 21 for the purpose of overload protection.

Further, the rigid gear 1 may be a metal gear made of metal. The elastic part 2 may be made of plastic.

Further, as shown in fig. 1 to 4, the elastic member 2 may further include a transmission gear 22 disposed coaxially with the elastic engaging portion. The transmission gear 22 may be a plastic gear made of plastic. Also, the entire elastic member 2 (including the transmission gear 22 and the elastic engaging portion) may be integrally injection-molded.

Further, as shown in fig. 2, the overload protection mechanism may include a rotating shaft 3, and the elastic member 2 may be provided with a central hole penetrating along an extending direction of a central axis thereof, through which the rotating shaft 3 passes, for supporting the elastic member 2.

According to the overload protection mechanism of the utility model, the rigid gear 1 is connected with a driving motor, for example, a driving shaft of the driving motor, the elastic component 2 is connected with a driven component through the transmission gear 22, if the rotation speed of the driving motor enables the torque transmitted between the rigid gear 1 and the elastic component 2 to be in a normal load range, the internal teeth 12 of the rigid gear 1 and the elastic external teeth 211 of the elastic component 2 are in a normal meshing state, so that the rigid gear 1 and the elastic component 2 synchronously rotate, and the transmission gear 22 and the driven component which is in matched connection with the transmission gear are driven to normally operate. If the rotation speed of the driving motor is such that the torque transmitted between the rigid gear 1 and the elastic component 2 exceeds the normal load range, the elastic external teeth 211 of the elastic component 2 contract inwards in the radial direction due to the existence of the hollow structure 212, so that the elastic external teeth 211 are disengaged from the internal teeth 12 of the rigid gear 1, a slip occurs between the rigid gear 1 and the elastic component 2, the rigid gear 1 is caused to idle, and the elastic component 2 stops rotating gradually, so that overload protection is provided for the rigid gear 1, the driving motor and the transmission gear 22 connected with the rigid gear 1, and driven components connected with the rigid gear 1.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the utility model, which fall within the scope of the utility model as claimed.

Claims

1. An overload protection mechanism, comprising:

2. The overload protection mechanism of claim 1, wherein the resilient engagement portion includes three resilient arms equally spaced apart in a circumferential direction.

3. The overload protection mechanism of claim 1, wherein the rigid gear is made of metal.

4. The overload protection mechanism of claim 1, wherein the resilient member is formed from plastic.

5. The overload protection mechanism of claim 1, wherein a radial dimension of the hollow structure is greater than a radial dimension of the resilient outer teeth.

6. The overload protection mechanism of claim 1, wherein the resilient member further includes a drive gear disposed coaxially with the resilient engagement portion.

7. The overload protection mechanism of claim 6, wherein the drive gear is integrally injection molded with the resilient engagement portion.

8. The overload protection mechanism according to claim 1, further comprising a rotation shaft, wherein the elastic member is provided with a central hole penetrating along an extending direction of a central axis thereof, and the rotation shaft penetrates through the central hole.

9. A transmission system comprising a drive motor, a driven component and an overload protection mechanism according to any one of claims 1 to 8.

10. The transmission system of claim 9, wherein the rigid gear is coupled to the drive motor and the resilient member is coupled to the driven component.