CN217539515U

CN217539515U - High-torque electric power steering system gear and automobile thereof

Info

Publication number: CN217539515U
Application number: CN202220528255.5U
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: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-10-04
Anticipated expiration: 2032-03-08

Abstract

The utility model provides an automobile parts technical field a high moment of torsion electric power steering system gear and car thereof, including working of plastics and metal insert, the working of plastics sets up with the metal insert gomphosis. The plastic part comprises a first tooth profile, a weight reduction groove, a reinforcing rib and a first shaft hole, the first tooth profile is fixedly arranged on the plastic part, the weight reduction groove is fixedly arranged on the plastic part, the reinforcing rib is fixedly arranged on the plastic part, and the first shaft hole is fixedly arranged on the plastic part. The metal insert comprises a second tooth form, a step and a shaft hole, the second tooth form is fixedly arranged on the metal insert, the step is fixedly arranged on the metal insert, and the shaft hole is fixedly arranged on the metal insert. 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 requirements of electric power steering gears of commercial vehicles and heavy-duty vehicles are met; the fatigue resistance is high, and the service life of the automobile is prolonged; the effects of pitting corrosion resistance and abrasion resistance of the gear are improved.

Description

High-torque electric power steering system gear and automobile thereof

Technical Field

The utility model relates to an automobile parts technical field specifically, relates to an electronic power steering system gear of high moment of torsion and car thereof.

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 in addition, the advantage of the steering positioning of the electric power steering system is widely applied to cars. However, since commercial vehicles, trucks and heavy trucks require a larger amount of 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 wear resistant and can withstand high torque, and have fatigue strength that meets the use requirements.

Through prior art retrieval discovery, chinese utility model patent publication number is CN210949748U, discloses a high-accuracy gear for electric power steering system, relates to high moment of torsion electric power steering system gear technical field, including the gear body, the middle part inboard of gear body sets up the adapter sleeve, and the inboard of adapter sleeve is provided with the centre bore, and the inboard of adapter sleeve is provided with the screw hole, and the inboard of screw hole is provided with the plug screw, and the inside of gear body is provided with the oil storage chamber, and the terminal surface inboard of gear body is provided with the oil feeding hole. The utility model has the above problems.

The utility model relates to a high moment of torsion electric power steering system gear adopts the mode that working of plastics and metal insert combine, wherein adopts metal insert in the part that the bearing is connected, designs through means such as moulding plastics and machining and not only wear-resisting but also can bear the high moment of torsion, the high gear of fatigue strength moreover. Therefore, the utility model relates to a simply, but 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 a high moment of torsion electric power steering system gear and car thereof.

According to the utility model, the high-torque electric power steering system gear comprises a plastic part and a metal insert, wherein the plastic part is embedded with the metal insert;

the plastic part comprises a first tooth profile, a weight reduction groove, a reinforcing rib and a first shaft hole, the first tooth profile is fixedly arranged on the plastic part, the weight reduction groove is fixedly arranged on the plastic part, the reinforcing rib is fixedly arranged on the plastic part, and the first shaft hole is fixedly arranged on the plastic part;

the metal insert comprises a second tooth form, a step and a shaft hole, the second tooth form is fixedly arranged on the metal insert, the step is fixedly arranged on the metal insert, and the shaft hole is fixedly arranged on the metal insert.

In some embodiments, the tooth-shaped element is fixedly arranged on the outer side of the plastic part.

In some embodiments, the reinforcing rib is fixedly arranged in the tooth groove of the first tooth form.

In some embodiments, the axial hole is fixedly arranged at the central position of the plastic part.

In some embodiments, the weight-reduction grooves are symmetrically arranged around the shaft hole.

In some embodiments, the second tooth form is fixedly arranged on the outer side of the metal insert.

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

In some embodiments, the step protrusion is disposed on one side of the second tooth form.

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

The utility model also provides a car, include the electronic power assisted steering system gear of high moment of torsion.

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 requirements of electric power steering gears of commercial vehicles and heavy-duty vehicles are 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 in the running process of the gear is reduced; promote the engine fuel efficiency of car, the inserts cost is also lower simultaneously, reduces the manufacturing cost of enterprise.

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 plastic member of a high torque electric power steering gear of the present invention;

FIG. 2 is a schematic structural view of a metal insert of the gear of the high torque electric power steering system of the present invention;

fig. 3 is a cross-sectional view of the gear of the high torque electric power steering system of the present invention.

Reference numerals are as follows:

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist 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 is a schematic structural view of a plastic member of the gear of the high torque electric power steering system of the present invention. Fig. 2 is a schematic structural diagram of a metal insert of the gear of the high-torque electric power steering system according to the present invention. Fig. 3 is a sectional view of the gear of the high torque electric power steering system of the present invention. Comprises a plastic piece 1 and a metal insert 2, wherein the plastic piece 1 and the metal insert 2 are embedded. The plastic part 1 comprises a tooth profile I11, a weight reduction groove 12, a reinforcing rib 13 and a shaft hole I14, wherein the tooth profile I11 is fixedly arranged on the plastic part 1, the weight reduction groove 12 is fixedly arranged on the plastic part 1, the reinforcing rib 13 is fixedly arranged on the plastic part 1, and the shaft hole I14 is fixedly arranged on the plastic part 1. The metal insert 2 comprises a second tooth form 21, a step 22 and a second shaft hole 23, the second tooth form 21 is fixedly arranged on the metal insert 2, the step 22 is fixedly arranged on the metal insert 2, and the second shaft hole 23 is fixedly arranged on the metal insert 2.

The first tooth-shaped part 11 is fixedly arranged on the outer side of the plastic part 1. The reinforcing ribs 13 are fixedly arranged in the tooth grooves of the first tooth profiles 11. The first shaft hole 14 is fixedly arranged at the center of the plastic part 1. The weight-reducing grooves 12 are symmetrically arranged around the first shaft hole 14. The second tooth form 21 is fixedly arranged on the outer side of the metal insert 2, and the purpose is to increase the bonding force between the metal insert 2 and the plastic part 1. The second shaft hole 23 is fixedly arranged at the center of the metal insert 2. The step 22 is arranged on one side of the second tooth-shaped part 21 in a protruding mode and prevents the plastic part 1 from moving axially. Plastic part 1 comprises a polyetheretherketone plastic part and metal insert 2 comprises a 20 carbon steel metal insert or a 40Cr metal insert.

The specific production mode of the high-torque electric power steering system gear is as follows:

the first step is as follows: hot forging a blank of the metal insert 2. The metal material can be 20 carbon steel or 40 Cr. The second step is that: and (3) turning the blank of the hot-forged metal insert 2 to machine the shaft hole and the end surfaces at two sides. The third step: the metal insert 2 is preheated to 200-220 ℃ in an oven. The fourth step: the metal insert 2 is placed into a mold for injection molding, and the injection molding process comprises the following steps: the temperature of the mould 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 1 gear containing the metal insert 2 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 power 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, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not 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 high-torque electric power steering system gear is characterized by comprising a plastic part (1) and a metal insert (2), wherein the plastic part (1) and the metal insert (2) are embedded;

the plastic part (1) comprises a first tooth profile (11), a weight reduction groove (12), a reinforcing rib (13) and a first shaft hole (14), the first tooth profile (11) is fixedly arranged on the plastic part (1), the weight reduction groove (12) is fixedly arranged on the plastic part (1), the reinforcing rib (13) is fixedly arranged on the plastic part (1), and the first shaft hole (14) is fixedly arranged on the plastic part (1);

the metal insert (2) comprises a second tooth form (21), a step (22) and a second shaft hole (23), the second tooth form (21) is fixedly arranged on the metal insert (2), the step (22) is fixedly arranged on the metal insert (2), and the second shaft hole (23) is fixedly arranged on the metal insert (2).

2. A high torque electric power steering gear according to claim 1, wherein the first tooth profile (11) is fixedly arranged on the outside of the plastic part (1).

3. The high torque electric power steering gear according to claim 1, wherein the ribs (13) are fixedly arranged in the tooth spaces of the tooth profile one (11).

4. The high torque electric power steering gear according to claim 1, wherein the axial hole one (14) is fixedly disposed at a central position of the plastic member (1).

5. The high torque electric power steering gear according to claim 4, wherein the weight-reduction recesses (12) are symmetrically disposed around the first axial hole (14).

6. The high torque electric power steering system gear according to claim 1, wherein the tooth profile two (21) is fixedly arranged on the outer side of the metal insert (2).

7. The high torque electric power steering gear according to claim 1, wherein the second shaft hole (23) is fixedly arranged at the center of the metal insert (2).

8. The high torque electric power steering gear according to claim 1, wherein the step (22) is protrudingly provided on one side of the tooth profile two (21).

9. The high torque electric power steering system gear according to claim 1, wherein the plastic (1) comprises a polyetheretherketone plastic and the metal insert (2) comprises a 20 carbon steel metal insert or a 40Cr metal insert.

10. An automobile comprising a high torque electric power steering gear according to any one of claims 1 to 9.