CN209909080U

CN209909080U - Worm gear mechanism

Info

Publication number: CN209909080U
Application number: CN201920136942.0U
Authority: CN
Inventors: 童爱军
Original assignee: Dongguan City Spark Gear Co Ltd
Current assignee: Dongguan City Spark Gear Co Ltd
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2020-01-07
Anticipated expiration: 2029-01-24

Abstract

The utility model discloses a worm gear mechanism, which comprises a worm gear and a worm which can be meshed with each other, wherein the worm gear is made of metal, and the worm is made of plastic; the tooth thickness of the worm wheel at the reference circle is 3/4P, the tooth thickness of the worm at the reference circle is 1/4P, and P is the pitch of the worm wheel; the pressure angle of the worm ranges from 2 to 12.5 degrees. The utility model provides a worm gear mechanism can steadily transmit, thereby and the worm wheel tooth thickness obtains improving difficult wearing and tearing, has improved worm gear mechanism's life.

Description

Worm gear mechanism

Technical Field

The utility model relates to a drive mechanism technical field, in particular to worm gear mechanism.

Background

However, with the development of the plastic industry, a worm gear mechanism consisting of a metal worm and a plastic worm wheel appears, and the worm gear mechanism has the advantages of low cost, low noise and the like, so that the worm gear mechanism gradually replaces the metal worm used in some household and civil facilities. In the prior art, the tooth thickness of the worm at a reference circle is 1/2P (P is the pitch of the worm wheel), the pressure angle of the worm wheel and the worm is usually designed to be 20 degrees, the traditional design enables the strength of the stress on the worm wheel and the worm wheel to be equal, but the mechanical strength of the metal worm is better than that of the plastic worm wheel, so that the plastic worm wheel is relatively easy to wear and damage, and the transmission of the whole worm wheel and worm mechanism fails.

It is seen that improvements and enhancements to the prior art are needed.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a worm and gear mechanism, which aims to solve the technical problem that the plastic worm gear is easy to be damaged in the worm and gear mechanism composed of the metal worm and the plastic worm gear in the prior art.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a worm gear mechanism comprises a worm gear and a worm which can be meshed with each other, wherein the worm gear is made of metal, and the worm is made of plastic; the tooth thickness of the worm wheel at the reference circle is 3/4P, the tooth thickness of the worm at the reference circle is 1/4P, and P is the pitch of the worm wheel; the pressure angle of the worm ranges from 2 to 12.5 degrees.

In the worm gear mechanism, the worm wheel is made of POM plastic.

In the worm gear mechanism, the worm gear is formed by injection molding.

In the worm gear mechanism, the worm is made of stainless steel or aluminum alloy.

In the worm gear mechanism, the worm is machined and molded through a lathe.

In the worm gear mechanism, the transmission ratio range of the worm gear mechanism is (1: 5) - (1: 100).

Has the advantages that: compared with the prior art, the worm gear is made of metal, the tooth thickness of the worm is reduced, the worm gear is made of plastic, the tooth thickness of the worm gear is improved, and the pressure angle is limited at the same time, so that the complete tooth shape can be processed conveniently even if the tooth thickness of the worm is reduced; thereby forming a worm gear mechanism that differs from conventional designs. During the in-service use, worm gear can transmit steadily, and the worm wheel is difficult for wearing and tearing, has improved worm gear mechanism's life.

Drawings

Fig. 1 is a front view of the worm and gear mechanism provided by the present invention.

Detailed Description

The utility model provides a worm gear mechanism, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the attached drawing and the embodiment of lifting the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, the present invention provides a worm and gear mechanism. The figures only schematically show the meshing state of the worm and the worm wheel, and do not show the complete structure of the worm and the worm wheel. Fig. 1 is not intended to limit the specific number of teeth of the worm and the worm wheel.

A worm gear mechanism comprises a worm wheel 1 and a worm 2 which can be meshed with each other (in the figure 1, the worm wheel and the worm are in a meshed state), wherein the worm wheel 1 is made of metal, and the worm 2 is made of plastic; the tooth thickness of the worm wheel 1 at the reference circle 101 is 3/4P; the thickness of the worm 2 at its reference circle 201 is 1/4P, which is the pitch of the worm wheel (P ═ pi × m, m is the worm wheel modulus). The pressure angle of the worm ranges from 2 to 12.5 deg., which is vertically equal to half the angle a in fig. 1. It is understood that the actual tooth thickness and the expressions "3/4P" and "1/4P" may have some deviation, even if the deviation is a certain degree, due to machining error and other factors, and the present invention also falls into the protection scope of the present invention.

Through the arrangement, the thickness of the teeth of the worm wheel is thickened, and the worm wheel is not easy to wear in the using process. In addition, if the tooth thickness of the worm is simply thinned, the tooth profile of the worm is obviously sharpened, and the actual tooth profile cannot be processed; the utility model discloses in, through reducing the pressure angle (less than conventional 20 pressure angles), under the thick circumstances of tooth of attenuate metal worm, the worm profile can obviously not become sharp, consequently can actually process out the actual profile of tooth of worm, guarantees that worm wheel and worm can normally mesh and transmission.

Preferably, the worm wheel is made of POM plastic, and the service life of the worm wheel is prolonged due to the advantages of high hardness, high wear resistance and the like of the POM plastic.

Preferably, the worm gear is injection molded.

Preferably, the worm is made of stainless steel or aluminum alloy, and of course, even if the technical nature of the worm made of other metals is not changed, the worm falls into the protection scope of the present invention.

Preferably, the worm is machined and formed through a lathe, and the fact that the actual worm is machined with high precision can be guaranteed.

Preferably, the transmission ratio range of the worm gear mechanism is (1: 5) - (1: 100).

Through the analysis, the worm gear mechanism provided by the utility model has the advantages that the worm is made of metal, the tooth thickness of the worm is reduced, the worm gear is made of plastic, the tooth thickness of the worm gear is increased, and the pressure angle is limited, so that the complete tooth shape can be conveniently processed even if the tooth thickness of the worm is reduced; thereby forming a worm gear mechanism that differs from conventional designs. During the in-service use, worm gear mechanism can transmit steadily, and the worm wheel is difficult for wearing and tearing, has improved worm gear mechanism's life.

It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.

Claims

1. A worm gear mechanism comprises a worm gear and a worm which can be meshed with each other, and is characterized in that the worm gear is made of metal, and the worm is made of plastic; the tooth thickness of the worm wheel at the reference circle is 3/4P, the tooth thickness of the worm at the reference circle is 1/4P, and P is the pitch of the worm wheel; the pressure angle of the worm ranges from 2 to 12.5 degrees.

2. The worm-gear mechanism according to claim 1, wherein the worm gear is made of POM plastic.

3. The worm-gear mechanism according to claim 2, wherein the worm gear is injection molded.

4. The worm-gear mechanism according to claim 1, wherein the worm is made of stainless steel or aluminum alloy.

5. The worm-gear mechanism according to claim 4, wherein the worm is formed by lathe machining.

6. The worm-gear mechanism according to claim 1, characterized in that the transmission ratio of the worm-gear mechanism ranges from (1: 5) to (1: 100).