CN212004112U - Worm gear improves structure - Google Patents

Abstract

The utility model discloses an improved structure of a worm gear, which comprises a worm wheel; a worm engaged with the worm wheel; the shell is arranged outside the worm wheel and the worm; the bearing assembly is connected with the worm wheel and the shell and comprises a bearing inner ring and a bearing outer ring; an elastomeric filling structure filling between the bearing assembly and the housing. The utility model discloses a structure is improved to the worm gear, improves meshing noise and bearing radial force, and simple structure, has still reduced the cost of bearing.

Description

Worm gear improves structure

Technical Field

The utility model belongs to the technical field of electric power steering technique and specifically relates to a worm gear improves structure.

Background

Electric Power Steering (EPS) has become more and more widely used in vehicle configurations due to its superior maintenance and expandable functionality. The utilization rate of the worm gear and worm structure is the highest, the structure is used for amplifying the output torque of the power-assisted motor and providing proper rotating speed, and in addition, the smoothness and NVH performance of EPS in the using process are considered, and the worm gear made of plastic nylon commonly used is matched with the worm made of metal. The worm and gear are always in a meshed state in the using process, but the worm and gear belong to machined products and have machining errors; and these errors can influence the meshing situation of worm gear, can make worm gear meshing not ideal, but whole mechanism transmission is not smooth and easy, can reflect and turn to feel and noise, influence driver's subjective experience and feel. In addition, the transmission of force exists in the worm gear, and the bearing at the lower end of the worm gear is subjected to radial force and axial force.

There are many methods for improving EPS performance. For example, the publication No. CN 207683593U of "a worm and gear mechanism of an electric power steering system" disclosed in the chinese patent document includes a housing, the worm and gear mechanism includes a worm wheel, a worm, a bearing assembly and a spring assembly, the worm wheel and the worm are mounted in the housing in a meshed manner, one end of the worm is connected with the housing through the bearing assembly, two ends of the spring assembly are respectively abutted against the housing and the bearing assembly, the spring assembly includes a spring seat, a first spring and a second spring, which are abutted against in sequence, the second spring is a steel sheet spring, the spring seat is abutted against and fixed relative to the housing, and an end of the second spring is abutted against and always attached to the bearing assembly. The utility model discloses a steel sheet spring through establishing ties absorbs the vibration energy of worm, restraines the vibration of worm and shakes and make a sound, nevertheless does not improve under the worm wheel single bearing radial force, and the spring unit who installs the needs installs comparatively complicatedly.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an it is great to overcome the worm gear structure meshing noise among the current electric power steering system, and the great problem of radial force that worm wheel lower extreme bearing received provides a worm gear and improves the structure, improves meshing noise and bearing radial force, and simple structure, has still reduced the cost of bearing.

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

an improved structure of worm gear comprises a worm wheel; a worm engaged with the worm wheel; the shell is arranged outside the worm wheel and the worm; the bearing assembly is connected with the worm wheel and the shell and comprises a bearing inner ring and a bearing outer ring; an elastomeric filling structure filling between the bearing assembly and the housing.

In the technical scheme, the worm wheel and the worm are arranged in the shell, the worm wheel and the worm are meshed with each other and are driven to rotate by the driving device in the electric power steering system, the lower end of the worm wheel is provided with the bearing assembly, and the elastic filling structure is arranged between the bearing assembly and the shell, so that the structure is simple; in the working state of the worm gear and the worm, the worm gear and the worm are meshed to enable the worm gear to generate radial force, the force can be transmitted to the bearing assembly, the radial force can be borne by the bearing, the elastic filling structure is an elastic body and is arranged between the bearing assembly and the shell, and a part of radial force can be consumed, so that the force borne by the bearing can be reduced, and therefore when the bearing assembly is selected, the bearing with small bearing radial force can be selected, and the cost of the bearing is reduced; in addition, under the working state of the worm gear, the worm gear meshing transmission also has micro abrasion, and the elastic filling piece between the bearing assembly and the shell can elastically compensate the abrasion, so that the meshing noise is reduced.

Preferably, the bearing assembly further comprises a bearing retainer and bearing steel balls, wherein the bearing retainer and the bearing steel balls are arranged between the bearing inner ring and the bearing outer ring respectively.

The bearing steel balls play a role in rolling and transferring force in the bearing assembly, and the bearing retainer plays a role in guiding the bearing steel balls to normally run and separating the bearing steel balls from each other to keep the same distance between the bearing steel balls, so that the friction and the heat productivity of the bearing assembly in the working process are minimized, and the load borne by the bearing steel balls is evenly distributed.

Preferably, the elastic filling structure is sleeved outside the bearing outer ring.

The elastic filling structure is sleeved outside the bearing outer ring, so that the elastic filling structure is directly assembled through the elasticity of the elastic filling structure, additional processes such as vulcanization and the like are not needed, and the mounting process is simplified.

Preferably, a limiting groove is formed in the bearing outer ring, the elastic filling structure is arranged in the limiting groove, and the thickness of the elastic filling structure is larger than the depth of the limiting groove.

The setting of spacing groove is convenient for install the elasticity filling structure, prevents that the elasticity filling structure from outside the roll-off bearing subassembly when the bearing subassembly installation, causes inconveniently, and the cooperation between bearing subassembly and the casing is clearance fit, and the clearance between bearing subassembly and the casing has effectively been eliminated to the degree of depth that the thickness of elasticity filling structure is greater than the spacing groove.

Preferably, the limiting groove is provided with a plurality of annular groove structures which are arranged in parallel.

The limiting grooves are arranged into a plurality of annular groove structures which are arranged in parallel, so that the installation position of the elastic filling structure is convenient to determine, the elastic filling structure is effectively prevented from sliding out, and the installation of the elastic filling structure is firmer.

Preferably, the elastic filling structure is provided as a rubber structure.

The rubber structure has elasticity and can be tightly sleeved outside the bearing outer ring.

Preferably, the rubber structure is a split rubber ring, and the rubber rings are arranged in the limiting groove in parallel.

The rubber ring is embedded in the annular groove corresponding to the limiting groove, so that the elastic filling structure is in line contact with the shell, the gap between the bearing assembly and the shell is effectively eliminated, but the large interference magnitude can not be generated, the self clearance of the bearing becomes negative, the problem of bearing clamping bands is avoided, and the split type rubber ring is simple to process and manufacture.

Preferably, the rubber structure is provided as a one-piece rubber ring.

The clearance between bearing subassembly and the casing is eliminated in the setting of the rubber ring of integral type, and simple to operate is swift.

Therefore, the utility model discloses following beneficial effect has:

(1) the meshing noise and the radial force of the bearing are improved, the structure is simple, and the cost of the bearing is reduced;

(2) the elastic filling structure is directly assembled through the elasticity of the elastic filling structure, so that the installation process is simplified;

(3) the arrangement of the limiting groove facilitates installation of the elastic filling structure, determines the installation position of the elastic filling structure, and prevents the elastic filling structure from sliding out of the bearing assembly when the bearing assembly is installed, so that inconvenience is avoided.

(4) The thickness of the elastic filling structure is larger than the depth of the limiting groove, so that the gap between the bearing assembly and the shell is effectively eliminated.

Drawings

FIG. 1 is a schematic view of an improved worm gear structure;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of another portion A of FIG. 1;

FIG. 4 is a schematic structural view of a bearing assembly;

in the figure: 1. the worm gear comprises a worm 2, a worm wheel 3, a shell 4, a bearing assembly 401, a bearing inner ring 402, a bearing outer ring 403, bearing steel balls 404, a bearing retainer 5, an elastic filling structure 501, a rubber ring 502, a rubber ring 6 and a limiting groove.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example 1:

in embodiment 1 shown in fig. 1, a worm wheel and worm improved structure, a worm wheel 2, a worm 1 meshed with the worm wheel 2; the shell 3 is arranged outside the worm wheel 2 and the worm 1; the bearing assembly 4 is connected with the worm wheel 2 and the shell 3, the bearing assembly 4 comprises a bearing inner ring 401 and a bearing outer ring 402, a bearing retainer 404 is further arranged between the bearing inner ring 401 and the bearing outer ring 402, and a bearing steel ball 403 is further arranged in the bearing retainer 404; an elastic filling structure 5, wherein the elastic filling structure 5 is filled between the bearing component 4 and the shell 3.

In the technical scheme, worm and gear wheels are meshed with each other and mounted inside a shell 3, the worm and gear wheels rotate through a driving device in an electric power steering system, a bearing assembly 4 is mounted below a worm wheel 2 and is mainly used for connecting the worm wheel 2 and the shell 3, the shell 3 is sleeved outside the bearing assembly 4, bearing steel balls play a role in rolling and transmitting force in the bearing assembly 4, a bearing retainer 404 plays a role in guiding the bearing steel balls 403 to normally run and keeping the distances between the bearing steel balls 403 equal to the distances between the bearing steel balls 403, so that the friction and the heat productivity of the bearing assembly 4 in working are minimized, and the load borne by the bearing steel balls 403 is evenly distributed. An elastic filling structure 5 is arranged between the bearing assembly 4 and the shell 3, the arrangement of the elastic filling structure 5 ensures that no gap exists between the shell 3 and the bearing assembly 4 when the worm and gear work, the worm wheel can generate radial inward force due to the meshing between the worm wheel and the worm 1, and the force can be transmitted to the bearing assembly 4 and borne by the bearing assembly 4, so that the service life and the rotating hand feeling of the bearing can be influenced, the elastic filling structure 5 has certain elasticity and can consume a part of radial force, so that the force borne by the bearing can be reduced, and when the bearing assembly 4 is selected, a bearing with small bearing radial force can be selected, so that the bearing cost is reduced; in addition, under the working state of the worm gear, the worm gear meshing transmission also generates micro abrasion, and the elastic filling piece between the bearing assembly 4 and the shell 3 can perform elastic compensation on the worm gear meshing transmission, so that the meshing noise is reduced. The housing 3 is here provided as an aluminium housing 3.

Furthermore, the elastic filling structure 5 is sleeved outside the bearing outer ring 402, and the elastic filling structure 5 directly assembles the bearing outer ring 402 through the elasticity of the elastic filling structure, so that additional processes such as vulcanization are not required to be added, and the installation process and steps are simplified. During installation, the elastic filling structure 5 is manually assembled to the bearing outer ring 402, the whole bearing is assembled in the shell 3, and finally the assembly of other components is completed.

Example 2:

as shown in fig. 4, the embodiment 2 is basically the same as the embodiment 1, except that: a limiting groove 6 is arranged on the bearing outer ring 402, and the elastic filling structure 5 is arranged in the limiting groove 6. The arrangement of the limiting groove 6 effectively prevents the elastic filling structure 5 from sliding out of the bearing assembly 4 to cause inconvenience in the assembling process of the bearing assembly 4, the bearing assembly 4 and the shell 3 are in clearance fit, and the thickness of the elastic filling structure 5 is larger than the depth of the limiting groove 6 in order to eliminate the clearance between the bearing assembly 4 and the shell 3.

Furthermore, the limiting groove 6 is arranged into a plurality of annular groove structures which are arranged in parallel, the elastic filling structure 5 is convenient to position when being installed, meanwhile, the contact area between the bearing outer ring 402 and the elastic filling structure 5 is increased, and the installation firmness of the elastic filling structure 5 is improved.

Example 3:

as shown in fig. 2, the embodiment 3 is basically the same as the embodiment 1, except that: the elastic filling structure 5 is a rubber structure, and the rubber structure has elasticity and can be tightly sleeved outside the bearing outer ring 402. The rubber structure sets up to split type rubber circle 501, and rubber circle 501 inlays to be established in the ring channel that corresponds spacing groove 6, makes between elasticity filling structure 5 and the casing 3 be line contact, has effectively eliminated the clearance between bearing assembly 4 and the casing 3 in addition, but also can not appear the interference magnitude and lead to bearing self play to become the burden greatly to avoid producing the problem of bearing cassette tape, and split type rubber circle 501 manufacturing is simple.

Or as shown in fig. 3, the rubber structure is an integrated rubber ring 502, and the integrated rubber ring 502 can be installed in the limit groove 6 at one time, so that the installation is convenient and quick.

It should be noted that as used in the foregoing description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims (8)

1. An improved structure of a worm gear, which is characterized by comprising,

a worm wheel (2);

a worm (1) meshed with the worm wheel (2);

the shell (3), the said shell (3) is installed outside worm gear (2) and worm (1);

the bearing assembly (4), the bearing assembly (4) connects the worm wheel (2) and the housing (3), and the bearing assembly (4) comprises a bearing inner ring (401) and a bearing outer ring (402);

an elastic filling structure (5), the elastic filling structure (5) being filled between the bearing assembly (4) and the housing (3).

2. The improved worm and gear structure as claimed in claim 1, wherein the bearing assembly (4) further comprises a bearing retainer (404) and a bearing steel ball (403) arranged in the bearing retainer (404), wherein the bearing retainer (404) is arranged between the bearing inner ring (401) and the bearing outer ring (402).

3. The improved worm and gear structure as claimed in claim 1, wherein the elastic filling structure (5) is sleeved outside the bearing outer ring (402).

4. The improved worm and gear structure as claimed in claim 1, wherein a limit groove (6) is provided on the bearing outer ring (402), the elastic filling structure (5) is provided in the limit groove (6), and the thickness of the elastic filling structure (5) is greater than the depth of the limit groove (6).

5. The improved worm and gear structure as claimed in claim 4, wherein the limiting groove (6) is configured as a plurality of annular grooves arranged in parallel.

6. An improved worm-gear structure, as claimed in any one of claims 1 to 5, characterised in that the resilient infill structure (5) is provided as a rubber structure.

7. The improved worm and gear structure as claimed in claim 6, wherein the rubber structure is a split type rubber ring (501), and the rubber rings (501) are arranged in parallel in the limiting groove (6).

8. The improved worm gear and worm screw structure as claimed in claim 6, wherein said rubber structure is provided as an integral rubber ring (502).

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