CN111442078B

CN111442078B - Low-noise worm gear speed reducer

Info

Publication number: CN111442078B
Application number: CN202010377303.0A
Authority: CN
Inventors: 蔡东; 胡军; 金新华; 金超
Original assignee: Jiangsu Guomao Reducer Group Co ltd
Current assignee: Jiangsu Guomao Reducer Group Co ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-10-02
Anticipated expiration: 2040-05-07
Also published as: CN111442078A

Abstract

The invention relates to the technical field of speed reducers, in particular to a low-noise worm and gear speed reducer which comprises a worm wheel and a worm; the worm wheel shaft comprises an outer rod body, an inner rod core and an elastic gasket, and two ends of the inner rod core extend to the outer part of the outer rod body; a plurality of first tooth-shaped structures are uniformly distributed in the outer rod body, a second tooth-shaped structure is arranged outside the inner rod core, the elastic gasket extends from the middle part to two sides to form two side edges, a first gap is formed between the side edge and the first tooth-shaped structure, a second gap is formed between the root part and the second tooth-shaped structure on the two sides, the first gap and the second gap are adjusted through relative movement between the outer rod body and the inner rod core, and one end of the inner rod core is connected with the outside as an output shaft. In the invention, the worm wheel shaft is designed in a split manner, and the purpose is to elastically buffer the impact between the tooth plates of the worm wheel and the worm, so that the noise degree can be reduced by buffering in the process of transmitting vibration between the two tooth plates, and the low-noise worm wheel and worm speed reducer is obtained.

Description

Low-noise worm gear speed reducer

Technical Field

The invention relates to the technical field of speed reducers, in particular to a low-noise worm and gear speed reducer.

Background

Worm gear reducers are used in a variety of applications in conjunction with motors, where the worm is driven by an auxiliary motor and meshes on a worm gear that is coupled to the output shaft of the module. In order to compensate for the gear backlash and limit the parasitic noise, it is known practice to insert a spring between the reduction gearbox housing and one of the bearing supports supporting the worm, designed to press the worm radially against the worm teeth.

However, during operation, the spring may be caused to move along the worm axis due to the vibrations of the output shaft, which movement to a large extent may cause impacts between the teeth of the worm wheel and the worm, so that parasitic noise is intensified under certain circumstances.

In view of the above circumstances, the present inventors have devised a low-noise worm gear reducer, which is more practical.

Disclosure of Invention

The invention provides a low-noise worm gear speed reducer, thereby effectively solving the problems in the background art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a low-noise worm gear and worm speed reducer comprises a worm gear and a worm which are meshed with each other, wherein the worm gear is fixed on the periphery of a worm gear shaft;

the worm wheel shaft comprises an outer rod body, an inner rod core and a plurality of elastic gaskets arranged between the outer rod body and the inner rod core, the inner rod core is sleeved in the outer rod body, two ends of the inner rod core extend to the outside of the outer rod body, so that the inner rod core and the outer rod core are respectively in rotating connection with hole sites on the shell through bearings, and the worm wheel is arranged on the outer rod body;

the elastic gasket extends from the middle part to two sides and is provided with two side edges in the extending direction, the edge of each side edge is attached to the second tooth-shaped structure, a first gap which is elastically changed between the side walls of the first tooth-shaped structures is obtained, a second gap which is elastically changed between the side walls of the second tooth-shaped structures is obtained, the first gap and the second gap are adjusted through relative movement between the outer rod body and the inner rod core, the end part of each side edge is attached to the side wall of the second tooth-shaped structure, and one end of the inner rod core is connected with the outside as an output shaft.

Furthermore, the elastic gasket is respectively attached to the tooth crest of the first tooth-shaped structure and the bottom of the tooth groove.

Furthermore, the elastic gasket is attached to the tooth top of the first tooth-shaped structure by surface attachment, and a turning line formed by the edge of the attachment surface due to turning is attached to the edge of the first tooth-shaped structure.

Furthermore, the binding face is a plane, and the bottom of the tooth socket is of an arc surface structure.

Furthermore, two side walls of the first tooth-shaped structure are symmetrically and parallelly arranged.

Further, the distance between the side wall of the tooth groove and the side wall of the first tooth-shaped structure arranged opposite to the tooth groove is gradually increased in the process of extending from the root. Further, the part of the end part of the side edge, which is attached to the second tooth-shaped structure, is a fillet structure.

Further, the bottom of the tooth groove is covered with a polytetrafluoroethylene layer structure.

Further, the bottom of the groove between two adjacent first tooth-shaped structures and the tooth crest of the second tooth-shaped structure are arranged in a clearance mode.

Furthermore, a groove body is arranged at the position of the turning line of the elastic gasket, and a polytetrafluoroethylene filling strip is arranged in the groove body.

Through the technical scheme, the invention has the beneficial effects that:

in the invention, the worm wheel shaft is designed in a split manner, and the purpose is to elastically buffer the impact between the tooth plates of the worm wheel and the worm, so that the noise degree can be reduced by buffering in the process of transmitting vibration between the two tooth plates, and the low-noise worm wheel and worm speed reducer is obtained.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a low noise worm gear reducer split at a first angle;

FIG. 2 is a schematic diagram of a low noise worm gear reducer split at a second angle;

FIG. 3 is a schematic view of the outer rod body and the inner rod core in a split state relative to the assembled worm gear shaft;

FIG. 4 is a cross-sectional view of the worm gear shaft;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is an enlarged end view of the outer rod body;

FIG. 7 is a schematic structural view of an elastic pad;

FIG. 8 is a schematic cross-sectional view of an elastomeric gasket;

FIG. 9 is a schematic view of the buffer area and the meshing area during meshing of the worm wheel and worm;

FIG. 10 is a schematic view of the tooth spaces of a first tooth form corresponding to the tooth spaces of a second tooth form, wherein the resilient pad is in a first operative condition;

FIG. 11 is a schematic view of the tooth spaces of the first tooth form and the second tooth form corresponding to each other, wherein the resilient pad is in a second operating state;

FIG. 12 is an enlarged view of a portion of the resilient pad;

reference numerals: the worm wheel comprises a worm wheel 1, a worm 2, a worm wheel shaft 3, an outer rod body 31, an inner rod core 32, an elastic gasket 33, a side edge 33a, a first gap 33b, a second gap 33c, a polytetrafluoroethylene filling strip 33d, a fillet structure 33e, a first tooth-shaped structure 34, a second tooth-shaped structure 35, a shell 4, a bearing 5, a motor 6 and a gear set 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

This embodiment is written in a progressive manner.

As shown in fig. 1 to 12, a low-noise worm gear reducer comprises a worm wheel 1 and a worm 2 which are meshed with each other, wherein the worm wheel 1 is fixed on the periphery of a worm wheel shaft 3; the worm wheel shaft 3 comprises an outer rod body 31, an inner rod core 32 and a plurality of elastic gaskets 33 arranged between the outer rod body 31 and the inner rod core 32, wherein the inner rod core 32 is sleeved in the outer rod body 31, and two ends of the inner rod core extend to the outside of the outer rod body 31 so as to be respectively and rotatably connected with hole positions on the shell 4 through bearings 5, and the worm wheel 1 is arranged on the outer rod body 31; the inner rod core 32 is provided with second tooth-shaped structures 35 which are matched with tooth grooves between two adjacent first tooth-shaped structures 34 in a one-to-one correspondence mode, two side edges 33a extend from the middle to two sides of the elastic gasket 33, edges of the side edges 33a in the extending direction are attached to the second tooth-shaped structures 35 to obtain first gaps 33b which are elastically changed with the side walls of the first tooth-shaped structures 34, second gaps 33c which are elastically changed are obtained between the roots of the side edges 33a and the side walls of the second tooth-shaped structures 35, the first gaps 33b and the second gaps 33c are adjusted through relative movement between the outer rod body 31 and the inner rod core 32, the end portions of the side edges 33a are attached to the side walls of the second tooth-shaped structures 35, and one end of the inner rod core 32 serves as an output shaft and is connected with the outside.

In the invention, the worm wheel shaft 3 is designed in a split mode, the impact between the tooth plates of the worm wheel 1 and the worm 2 is elastically buffered, the elastic gasket 33 is arranged to enable a buffering space and an elastic structure which can move relatively to be obtained between the outer rod body 31 and the inner rod core 32, in the process that the inner rod core 32 is used as an output shaft and is connected with the outside, vibration with different degrees can be generated due to different working conditions, the vibration mode directly acts on the tooth plates of the worm 2 through the tooth plates of the worm wheel 1 in the current use process to form larger parasitic noise, and in the invention, the noise degree can be reduced through buffering in the process of transmitting the vibration between the tooth plates through the arrangement of the buffering space, so that the low-noise worm and worm gear speed reducer is obtained.

Specifically, as shown in fig. 9, the region B is a meshing region, and the region C is a buffer region, and the vibration from the output shaft is dissipated to a certain extent in the region C by the elastic pad 33, so that the relative impact in the meshing region can be effectively relieved, and the purpose of reducing noise can be achieved.

During operation, power from the motor 6 can be transmitted to the worm wheel 1 through the connecting shaft structure and the gear set 7, two ends of the worm wheel 1 are also in rotating connection with the shell 4 through the bearings 5, and the worm wheel 1 is meshed with the worm 2 to adjust the finished power output.

As shown in fig. 10 and 11, the elastic pad 33 is respectively attached to the tooth crest and the bottom of the tooth socket of the first tooth-shaped structure 34, and this attachment ensures radial stability, so that the power transmission between the outer rod 31 and the inner rod 32 is relatively stable, and sudden change of relative position due to a radial unconstrained position relationship is avoided, so that the elastic deformation of the elastic pad 33 obtains a stable reference to implement more controllable and stable buffering.

In the above embodiment, the elastic pad 33 is preferably bonded to the tooth tip of the first tooth profile 34 by surface bonding, and the edge of the bonding surface is preferably bonded to the edge of the first tooth profile 34 by a bend line formed by bending the edge.

Through the surface attaching mode and the limitation of the edge turning line, a stable position relation is obtained between the elastic gasket 33 and the first tooth-shaped structure 34, the elastic gasket 33 is prevented from moving between the outer rod body 31 and the inner rod core 32, and the power transmission obstacle caused by vibration is avoided.

Wherein, binding face is the plane, and the bottom of tooth's socket is ARC structure, can make the bottom of tooth's socket pass through the line laminating between elastic gasket 33 and two first profile of tooth structures 34 through above-mentioned setting, takes place the in-process that relative position removed between the outer body of rod 31 and interior pole core 32, can make elastic gasket 33's surface tangent all the time with ARC structure, and obtain more stable laminating.

As a preference of the above embodiment, the two side walls of the first tooth-shaped structure 34 are symmetrically and parallelly arranged, and the arrangement ensures that the first tooth-shaped structure 34 is convenient to process, and simultaneously, the first gap 33b can be enlarged as much as possible, so as to obtain a more effective buffer space. The distance between the side wall of the tooth socket and the side wall of the first tooth-shaped structure 34 arranged opposite to the tooth socket is gradually increased in the process of extending the side wall of the tooth socket from the root, as shown in the change processes of fig. 10 and 11, one tooth of the first tooth-shaped structure 34 in fig. 10 is located at the center position of the tooth socket, and when vibration occurs, the tooth is deviated to one side, as shown in fig. 11, the tooth is deviated to the right side in the figure, at this time, the bottom of the first tooth-shaped structure 34 presses the elastic gasket 33, so that the root of the right side edge 33a in the figure is close to the right second tooth-shaped structure 35, the first gap 33b and the second gap 33c on the right side are both reduced until the root of the right side edge 33a is attached to the side wall of the second tooth-shaped structure 35, and the buffer purpose is realized in the reducing process, and the first gap 33; however, in this process, the end of the side edge 33a is always attached to the side wall of the second tooth structure 35, and there is no radial movement, so that the reliability of power transmission is ensured. In the above process, the end of the side edge 33a moves relative to the side wall of the second tooth structure 35, and therefore, as a preferred embodiment, the portion where the end of the side edge 33a abuts against the second tooth structure 35 is a rounded corner structure 33e, as shown in fig. 7 and 8, and the rounded corner structure 33e referred to herein can be obtained by rounding the edge where the side edge 33a abuts against the second tooth structure 35, so as to reduce the friction loss during the relative movement.

In order to further reduce the noise and ensure the structural integrity of parts in the vibration process, the bottom of the tooth groove is covered with a polytetrafluoroethylene layer structure. In this preferred scheme, polytetrafluoroethylene layer structure set up aim at and realize the self-lubricating, and this kind of self-lubricating realizes through the characteristic of material self, and the use of lubricating oil can effectively reduce the structure damage probability of this position under frequent vibrations in the cooperation box 4.

Preferably, as for the above embodiment, the gap between the bottom of the groove between two adjacent first tooth structures 34 and the tooth top of the second tooth structure 35 is set, and the gap set here can reduce the noise generated by friction while ensuring the stability of the radial structure.

As shown in fig. 12, a groove is provided at a position of a turning line of the elastic gasket 33, a polytetrafluoroethylene filling strip 33d is provided in the groove, and in a vibration process, since the edge of a joint surface between the elastic gasket 33 and the tooth top of the first tooth-shaped structure 34 may frequently collide with the first tooth-shaped structure 34, in order to reduce noise and prolong service life of the position, the polytetrafluoroethylene filling strip 33d is provided in the groove provided at the position, so that lubrication is provided, and simultaneously, the collision at the position is alleviated, and even when the polytetrafluoroethylene filling strip 33d at the position is damaged, normal operation of the speed reducer can be ensured.

It should be noted that the elasticity of the elastic pad 33 needs to be realized through the material characteristics thereof, and the complete structure can easily realize the purpose, and the elastic pad 33 preferably has a certain amount of compression when being installed between the outer rod 31 and the inner rod core 32, and even if the elastic pad does not have the amount of compression, the elastic pad preferably tightly fits with the two adjacent second tooth-shaped structures 35, so as to avoid the noise caused by the gap.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A low-noise worm gear speed reducer is characterized by comprising a worm gear (1) and a worm (2) which are meshed with each other, wherein the worm gear (1) is fixed on the periphery of a worm gear shaft (3);

the worm wheel shaft (3) comprises an outer rod body (31), an inner rod core (32) and a plurality of elastic gaskets (33) arranged between the outer rod body and the inner rod core (32), the inner rod core (32) is sleeved in the outer rod body (31), two ends of the inner rod core extend to the outer part of the outer rod body (31), so that the inner rod core and the outer rod core are respectively in rotating connection with hole positions on the shell (4) through bearings (5), and the worm wheel (1) is installed on the outer rod body (31);

the outer rod body (31) is internally provided with a plurality of first tooth-shaped structures (34) which are uniformly distributed in an annular mode, the outer portion of the inner rod core (32) is provided with second tooth-shaped structures (35) which are matched with tooth grooves between two adjacent first tooth-shaped structures (34) in a one-to-one correspondence mode, the elastic gasket (33) extends from the middle portion to two sides to form two side edges (33 a), the edges of the side edges (33 a) in the extending direction are attached to the second tooth-shaped structures (35) to form first gaps (33 b) which are elastically changed with the side walls of the first tooth-shaped structures (34), second gaps (33 c) which are elastically changed are formed between the roots of the side edges (33 a) and the second tooth-shaped structures (35), the first gaps (33 b) and the second gaps (33 c) are adjusted through relative movement between the outer rod body (31) and the inner rod core (32), and the end portions of the side edges (33 a) are attached to the side walls of the second tooth-shaped structures (35), one end of the inner rod core (32) is used as an output shaft to be connected with the outside.

2. The low noise worm gear reducer according to claim 1, wherein the elastic washer (33) is attached to a tooth crest of the first tooth profile structure (34) and a bottom of a tooth groove of the second tooth profile structure (35), respectively.

3. The low noise worm and gear reducer according to claim 2, wherein the elastic pad (33) is attached to the tooth top of the first tooth-shaped structure (34) by surface attachment, and a turning line formed by the edge of the attachment surface due to turning is attached to the edge of the first tooth-shaped structure (34).

4. The low noise worm gear and worm reducer according to claim 3, wherein the abutting surface is a plane surface, and the bottom of the tooth slot of the second tooth-shaped structure (35) is an arc-shaped structure.

5. The low noise worm-gear reducer according to claim 1, wherein two side walls of the first tooth-shaped structure (34) are arranged symmetrically and in parallel.

6. The low noise worm gear reducer according to claim 5, wherein the distance between the side wall of the tooth groove of the second tooth-shaped structure (35) and the side wall of the first tooth-shaped structure (34) arranged opposite to the side wall of the tooth groove of the second tooth-shaped structure is gradually increased in the process of extending from the root.

7. The low noise worm gear reducer according to claim 1, wherein the portion of the end of the side edge (33 a) that abuts the second tooth structure (35) is a rounded corner structure (33 e).

8. The low noise worm gear reducer according to claim 2, characterized in that the bottom of the tooth bottom of the second tooth-shaped structure (35) is covered with a teflon layer structure.

9. The low noise worm and gear reducer according to claim 2 or 8, wherein the groove bottom between two adjacent first tooth structures (34) is arranged in a clearance with the tooth top of the second tooth structure (35).

10. The low-noise worm and gear speed reducer according to claim 3, wherein a groove is arranged at the position of the turning line of the elastic gasket (33), and a polytetrafluoroethylene filling strip (33 d) is arranged in the groove.