CN217539513U

CN217539513U - Electric power steering system gear

Info

Publication number: CN217539513U
Application number: CN202220485362.4U
Authority: CN
Inventors: 顾伟; 杨帆; 顾润沺
Original assignee: Scm Advanced Material Tech Co ltd
Current assignee: Scm Advanced Material Tech Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-10-04
Anticipated expiration: 2032-03-04

Abstract

The utility model provides an automobile parts technical field an electric steering system gear, including working of plastics and metal insert, metal insert sets up with the working of plastics gomphosis, and the last fixed excircle teeth of a cogwheel that is provided with of metal insert, the fixed step that is provided with on the working of plastics. The utility model adopts the design structure of combining the polyether-ether-ketone plastic part with the 20 carbon steel metal insert or the 40Cr metal insert, so that the gear can bear very high torque, and the torque requirement of electric power steering gears of commercial vehicles, heavy-duty vehicles and the like is met; the fatigue resistance is high, and the service life of the whole automobile is prolonged; the pitting corrosion and abrasion resistant effect of the gear is improved; noise generated in the running process of the gear is reduced; the fuel oil using efficiency of the engine of the automobile is improved.

Description

Electric power steering system gear

Technical Field

The utility model relates to an automobile parts technical field specifically, relates to an electric steering system gear.

Background

The electric power steering system saves 3-4% of energy consumption compared with the traditional steering system due to the energy consumption saving, and has the advantage of steering positioning which is widely applied to cars. However, as commercial vehicles, trucks and heavy trucks require greater torque and wear, the current common materials such as nylon and metal materials cannot meet the design requirements at all, which requires the development of gears that are both wear resistant and capable of withstanding high torque and meet fatigue strength standards.

The prior art searches and discovers that the Chinese utility model patent publication No. CN206175610U discloses a steering gear of an automobile electric power steering system, which is a cylindrical revolving body structural member and comprises a gear big end and a gear small end, wherein the big end is provided with two symmetrically arranged arc grooves for butting with a steering input shaft; the groove bottom of the arc groove is of an angular structure formed by two slope surfaces, the two slope surfaces are perpendicular to corresponding diameter lines of the end face respectively, corners are formed at the bottoms of the side surfaces of the two sides of the arc groove and at the junctions of the slope surfaces, and the two corners are symmetrical. The utility model has the above problems.

The utility model relates to a high moment of torsion electric steering system gear adopts working of plastics and metal insert to combine, designs through means such as moulding plastics and machining and has not only wear-resisting but also can bear high moment of torsion, the high gear of fatigue resistance intensity moreover. Therefore, the utility model relates to an ingenious, the practicality is strong, can solve above-mentioned problem, and the in-service use effect is better.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing an electric steering system gear.

According to the utility model provides a pair of electric steering system gear, including working of plastics and metal insert, metal insert with the working of plastics gomphosis sets up, the last fixed excircle teeth of a cogwheel that is provided with of metal insert, the fixed step that is provided with on the working of plastics.

In some embodiments, the metal insert includes a lightening hole and a shaft hole, and the lightening hole and the shaft hole are fixedly arranged on the metal insert.

In some embodiments, the shaft hole is fixedly arranged at the center of the metal insert.

In some embodiments, the lightening holes are symmetrically arranged around the shaft hole, and the number of the lightening holes is fixedly 8.

In some embodiments, the metal insert further comprises grooves fixedly arranged on two sides of the metal insert, and the grooves on the two sides are symmetrically arranged.

In some embodiments, the shaft hole and the lightening hole are fixedly arranged on the groove.

In some embodiments, the plastic part comprises a polyetheretherketone plastic part.

In some embodiments, the metal insert comprises a 20 carbon steel metal insert or a 40Cr metal insert.

In some embodiments, the step is fixedly disposed in an inner direction of the plastic member.

In some embodiments, the external gear teeth are fixedly arranged in the outer side direction of the metal insert.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model adopts the design structure of combining the polyether-ether-ketone plastic part with the 20C steel metal insert or the 40Cr metal insert, so that the gear can bear high torque, and the torque requirement of electric power steering gears of commercial vehicles, heavy-duty vehicles and the like can be met; the fatigue resistance is high, and the service life of the whole automobile is prolonged; the effects of pitting corrosion resistance and abrasion resistance of the gear are improved; noise generated in the running process of the gear is reduced; the fuel oil using efficiency of the engine of the automobile is improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural view of a gear of an electric power steering system of the present invention;

fig. 2 is a front view of the electric power steering gear of the present invention;

fig. 3 is a sectional view of the electric power steering gear of the present invention.

Reference numerals:

metal insert 1 plastic part 2

Step 21 of lightening hole 11

Gear teeth 3 on the outer circle of the shaft hole 12

Groove 13

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

Fig. 1 shows a schematic structural diagram of the electric power steering system gear of the present invention. Fig. 2 is a front view of the electric power steering gear of the present invention. Fig. 3 is a cross-sectional view of the electric power steering gear of the present invention. Comprises a plastic piece 2 and a metal insert 1, wherein the metal insert 1 is embedded with the plastic piece 2. The metal insert 1 is fixedly provided with external gear teeth 3, and the purpose is to increase the binding force between the metal insert 1 and the plastic part 2. The plastic part 2 is fixedly provided with a step 21 to prevent the plastic part 2 from moving axially.

The metal insert 1 comprises a lightening hole 11 and a shaft hole 12, and the lightening hole 11 and the shaft hole 12 are fixedly arranged on the metal insert 1. The shaft hole 12 is fixedly arranged at the center of the metal insert 1. The lightening holes 11 are symmetrically arranged around the shaft hole 12, and 8 lightening holes 11 are fixedly arranged. The metal insert 1 further comprises grooves 13, the grooves 13 are fixedly arranged on two sides of the metal insert 1, and the grooves 13 on the two sides are symmetrically arranged to play a weight reducing role. The shaft hole 12 and the lightening hole 11 are fixedly arranged on the groove 13. The plastic part 2 comprises a polyetheretherketone plastic part. The metal insert 1 comprises a 20 carbon steel metal insert or a 40Cr metal insert. The step 21 is fixedly arranged in the inner direction of the plastic part 2. The external gear teeth 3 are fixedly arranged in the outer side direction of the metal insert 1.

The specific manufacturing method of the high-torque electric steering system gear is as follows:

the first step is as follows: the blank of the metal insert 1 is precision cast. The metal material can be 20 carbon steel or 40 Cr. The second step is that: and (3) turning the blank of the precisely cast metal insert 1 into the shaft hole 12 and the end surfaces on the two sides. The third step: the metal insert 1 is placed in an oven to be preheated to 200-220 ℃. The fourth step: the metal insert 1 is placed into a mold for injection molding, and the injection molding process comprises the following steps: the temperature of the die is 180-220 ℃; injection molding temperature of the injection molding machine: a first stage: 320-360 ℃; and a second stage: 320-360 ℃; a third stage: 320-360 ℃; a nozzle: 350-370 ℃. Injection molding pressure: the pressure adopted by the injection molding machine is 50MPa-200MPa, and the plastic part 2 gear containing the metal insert 1 in the figure 1 is injected. The fifth step: and removing the injection molding gate and burrs. And a sixth step: and processing according to the design precision requirement of the gear to obtain the novel high-torque electric steering system gear.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the essential spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The utility model provides an electric steering system gear, its characterized in that includes working of plastics (2) and metal insert (1), metal insert (1) with working of plastics (2) gomphosis sets up, metal insert (1) is gone up the fixed excircle teeth of a cogwheel (3) that is provided with, the fixed step (21) that is provided with on working of plastics (2).

2. Electric power steering system gear according to claim 1, characterized in that the metal insert (1) comprises lightening holes (11) and a shaft hole (12), the lightening holes (11) and the shaft hole (12) being fixedly arranged on the metal insert (1).

3. Electric power steering gear according to claim 2, characterized in that the shaft hole (12) is fixedly arranged in the central position of the metal insert (1).

4. The electric power steering gear according to claim 3, characterized in that the lightening holes (11) are symmetrically arranged around the shaft hole (12), and 8 lightening holes (11) are fixedly arranged.

5. The electric power steering gear according to claim 2, wherein the metal insert (1) further comprises grooves (13), the grooves (13) are fixedly arranged on two sides of the metal insert (1), and the grooves (13) on two sides are symmetrically arranged.

6. The electric power steering gear according to claim 5, characterized in that the shaft hole (12) and the lightening hole (11) are fixedly provided on the recess (13).

7. The electric power steering gear according to claim 1, wherein the plastic member (2) comprises a polyetheretherketone plastic member.

8. Electric steering system gear according to claim 1, characterized in that the metal insert (1) comprises a 20 carbon steel metal insert or a 40Cr metal insert.

9. Electric power steering gear according to claim 1, characterized in that the step (21) is fixedly arranged in the inner direction of the plastic part (2).

10. Electric steering gear according to claim 1, characterized in that the external gear teeth (3) are fixedly arranged in the direction of the outside of the metal insert (1).