CN211315038U

CN211315038U - Left-right-handed worm

Info

Publication number: CN211315038U
Application number: CN201921709828.9U
Authority: CN
Inventors: 韦涛峰; 肖伟兵; 罗永鸿; 闫鲲
Original assignee: Shenzhen Power Motor Industrial Co Ltd
Current assignee: Shenzhen Power Motor Industrial Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-08-21
Anticipated expiration: 2029-10-11

Abstract

The utility model relates to a left-right rotating worm, which comprises a long shaft part, a spiral part and a short shaft part from left to right in turn, wherein the spiral part comprises a first spiral rod unit, a transition unit and a second spiral rod unit from left to right in an integrated manner; the first screw rod unit and the second screw rod unit have opposite spiral directions, and the axial forces generated by the two screw units and the corresponding meshing gears in the working state of the left-handed worm and the right-handed worm are opposite, so that the axial forces are just counteracted, the stress among all parts in the transmission process is effectively balanced, and the noise generated by large axial force is avoided.

Description

Left-right-handed worm

Technical Field

The utility model belongs to the technical field of small-size gear box motor and specifically relates to a left-handed and right-handed worm.

Background

Small motor gearboxes have found widespread use in general purpose mechanical devices. The motor is widely applied to the field of adjustment of electric seats of automobiles due to the advantages of small volume, convenient transmission and the like, the transmission in the current adjusting device is designed into single worm wheel transmission which is mainly used for worm transmission, the contact state of gear teeth is changed due to the deformation of each part stressed in the transmission process, the poor contact state of the gear teeth is easy to generate, a meshing gap exists, and the motor generates great noise due to the large axial force of the worm wheel and the worm, so that the driving experience of the vehicle is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can effectively balance the axial force left-right-handed worm that produces because worm and worm wheel meshing.

In order to solve the technical problem, the utility model provides a screw part which comprises a long shaft part, a screw part and a short shaft part from left to right in sequence, wherein the screw part comprises a first screw rod unit, a transition unit and a second screw rod unit from left to right in an integrated manner; the first screw rod unit and the second screw rod unit have opposite screw directions.

Further, the spiral direction of the first spiral rod unit is right-handed, and the spiral direction of the second spiral rod unit is left-handed.

Further, the spiral direction of the first spiral rod unit is left-handed, and the spiral direction of the second spiral rod unit is right-handed.

Further, the rod bodies of the first screw rod unit and the second screw rod unit are in a rotating curved surface formed by taking a concave arc as a generatrix in the axial shape.

Further, the long shaft portion, the spiral portion, and the short shaft portion are all made of 40 Cr.

Furthermore, the first screw rod unit and the second screw rod unit are provided with a plurality of spiral lines, and the number of the spiral lines of the first screw rod unit and the second screw rod unit is equal.

Furthermore, the transition unit is annular, and the annular opening of the transition unit is matched with the rod bodies of the first screw rod unit and the second screw rod unit.

The beneficial effects of the utility model reside in that: the two spiral units with opposite spiral directions are arranged on the worm, and the axial force generated by the two spiral units and the corresponding meshing gear in the working state is opposite and just offset, so that the stress among all parts in the transmission process is effectively balanced, and the noise generated by large axial force is avoided.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

In the figure, a long shaft part 100, a spiral part 200, a first spiral rod unit 210, a transition unit 220, a second spiral rod unit 230 and a short shaft part 300.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, will explain the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1, a left-right worm according to an embodiment of the present invention includes a long shaft portion 100, a spiral portion 200, and a short shaft portion 300 in sequence from left to right, where the spiral portion 200 includes a first spiral rod unit 210, a transition unit 220, and a second spiral rod unit 230 integrally formed from left to right; the first screw unit 210 is coupled to one end of the long shaft portion 100, one end of the first screw unit 210, which is away from the long shaft portion 100, is coupled to the transition unit 220, one side of the transition unit 220, which is away from the first screw unit 210, is coupled to one end of the second screw unit 230, which is close to the first screw unit 210, and the first screw unit 210 and the second screw unit 230 have opposite screw directions.

It can be understood that, by arranging the two spiral units with opposite spiral directions on the worm, the axial forces generated by the two spiral units and the corresponding meshing gears are opposite in the working state, so that the axial forces are just counteracted, the stress among all the parts in the transmission process is effectively balanced, and the noise generated by large axial force is avoided.

In the technical solution of this embodiment, the spiral direction of the first spiral rod unit 210 is right-handed, and the spiral direction of the second spiral rod unit 230 is left-handed; or the spiral direction of the first spiral rod unit (210) is left-handed, and the spiral direction of the second spiral rod unit 230 is right-handed.

Further, the rod bodies of the first screw unit 210 and the second screw unit 230 have a rotational curved surface in which a concave arc is a generatrix in the axial direction.

It is understood that the first and second

screw rod units

210 and 230 are configured as a toroidal worm, and the axial shape of the worm body is a rotating curved surface formed by taking a concave arc as a generatrix, so that the worm and the worm wheel form a toroidal worm drive. In the meshing belt of the transmission, the pitch circle of the worm wheel is positioned on the pitch arc surface of the worm, namely, the pitch arc of the worm wraps the worm wheel along the pitch circle of the worm wheel, and in the middle plane, the worm and the worm wheel are both in straight tooth profiles. Because the number of the engaged teeth is large, and the contact line of the teeth is approximately vertical to the moving direction of the worm teeth, the stress condition of the teeth and the condition of forming a lubricating oil film are greatly improved, the bearing capacity is about 2-4 times of that of the Archimedes worm, and the efficiency is generally as high as 0.85-0.9; it requires high manufacturing and installation accuracy.

Further, the long shaft portion 100, the spiral portion 200, and the short shaft portion 300 are all made of 40 Cr.

It can be understood that 40Cr is the GB standard steel number in our country, 40Cr steel is one of the most widely used steels in the mechanical manufacturing industry, can be applied to the manufacture of worms, has moderate price and easy processing, and can obtain certain toughness, plasticity and wear resistance after proper heat treatment. Normalizing can promote tissue refinement, approach an equilibrium state, improve the cutting performance of a blank, and temper at 550-570 ℃, so that the steel has the best comprehensive mechanical property. The hardenability of the steel is higher than 45 steel, and the steel is suitable for surface hardening treatment such as high-frequency quenching, flame quenching and the like.

Further, a plurality of spiral lines are provided for the first spiral rod unit 210 and the second spiral rod unit 230, and the number of spiral lines of the first spiral rod unit 210 and the second spiral rod unit 230 is equal.

It can be understood that, only one spiral line on the worm is called a single-head worm, that is, the worm rotates for one circle, the worm wheel rotates for one tooth, if the worm has two spiral lines, the worm is called a double-head worm, that is, the worm rotates for one circle, the worm wheel rotates for two teeth, and a plurality of spiral lines are analogized according to the principle, so that the transmission efficiency can be increased, and the number of the spiral lines of the first spiral rod unit 210 and the second spiral rod unit 230 is equal to make the limitation in consideration of the flat cross cancellation problem of the axial force.

Further, the transition unit 220 is ring-shaped, and the ring mouth of the transition unit 220 is matched with the rod bodies of the first screw rod unit 210 and the second screw rod unit 230.

It will be appreciated that the transition unit 220 is provided in a ring shape which is more stable than other regular shapes and which may increase the life of the worm.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description in any form, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides a left-right spiral worm, includes major axis portion (100), spiral portion (200) and minor axis portion (300) from left to right in proper order, its characterized in that: the spiral part (200) is integrally formed from left to right and comprises a first spiral rod unit (210), a transition unit (220) and a second spiral rod unit (230); the first screw unit (210) and the second screw unit (230) have opposite screw directions.

2. A right-and-left-handed worm as defined in claim 1, wherein: the spiral direction of the first spiral rod unit (210) is right-handed, and the spiral direction of the second spiral rod unit (230) is left-handed.

3. A right-and-left-handed worm as defined in claim 1, wherein: the spiral direction of the first spiral rod unit (210) is left-handed, and the spiral direction of the second spiral rod unit (230) is right-handed.

4. A right-and-left-handed worm as claimed in any one of claims 1 to 3, wherein: the rod bodies of the first spiral rod unit (210) and the second spiral rod unit (230) are in a rotating curved surface formed by taking a concave arc as a generatrix in the axial shape.

5. A right-and-left-handed worm as claimed in any one of claims 1 to 3, wherein: the long shaft portion (100), the spiral portion (200), and the short shaft portion (300) are all made of 40 Cr.

6. A right-and-left-handed worm as claimed in any one of claims 1 to 3, wherein: the first screw rod unit (210) and the second screw rod unit (230) are provided with a plurality of spiral lines, and the number of the spiral lines of the first screw rod unit (210) and the second screw rod unit (230) is equal.

7. A right-and-left-handed worm as claimed in any one of claims 1 to 3, wherein: the transition unit (220) is annular, and the annular opening of the transition unit (220) is matched with the rod bodies of the first screw rod unit (210) and the second screw rod unit (230).