CN221188736U - Worm wheel structure and automobile electric steering system - Google Patents
Worm wheel structure and automobile electric steering system Download PDFInfo
- Publication number
- CN221188736U CN221188736U CN202322676637.XU CN202322676637U CN221188736U CN 221188736 U CN221188736 U CN 221188736U CN 202322676637 U CN202322676637 U CN 202322676637U CN 221188736 U CN221188736 U CN 221188736U
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- Prior art keywords
- worm gear
- tooth
- connecting body
- worm
- connector
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- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 15
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000004677 Nylon Substances 0.000 claims abstract description 6
- 229920001778 nylon Polymers 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000003365 glass fiber Substances 0.000 description 11
- 238000001746 injection moulding Methods 0.000 description 11
- 229920002302 Nylon 6,6 Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 but not limited to Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 1
- 229920006128 poly(nonamethylene terephthalamide) Polymers 0.000 description 1
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- Gears, Cams (AREA)
Abstract
The utility model provides a worm gear structure and an automobile electric steering system, comprising: worm gears and metal worms; the worm wheel is meshed with the metal worm; the worm wheel includes: a worm gear tooth-shaped portion and a connecting body; the connecting body is of an annular structure, the worm gear tooth-shaped part is arranged on the peripheral side of the outer ring of the connecting body, and the inner ring spline is arranged on the inner ring side of the connecting body and is connected with the turbine bearing through the inner ring spline. The worm gear is divided into the worm gear tooth-shaped part and the connecting body, the connecting body made of nylon can bear high torque, the torque requirement of the electric power steering gears of business cars, heavy-duty cars and the like is met, the fatigue strength of the worm gear tooth-shaped part made of polyether-ether-ketone is high, pitting corrosion and abrasion are resisted, and the whole life requirement of the automobile is met.
Description
Technical Field
The utility model relates to the field of automobile part structures, in particular to a worm gear structure and an automobile electric steering system.
Background
The Electric Power Steering (EPS) system has the advantages of saving 3-4% of energy consumption, steering positioning accuracy and the like compared with the traditional steering system because of energy consumption saving; but because commercial vehicles, trucks and heavy trucks require greater torque and wear; there is a need for a wear resistant and high torque bearing device; and worm wheel with good fatigue strength.
Disclosure of utility model
Aiming at the defects in the prior art, the utility model aims to provide a worm wheel structure and an automobile electric steering system.
According to the present utility model, there is provided a worm wheel structure comprising: worm gears and metal worms;
the worm wheel is meshed with the metal worm;
the worm wheel includes: a worm gear tooth-shaped portion and a connecting body;
The connecting body is of an annular structure, the worm gear tooth-shaped part is arranged on the peripheral side of the outer ring of the connecting body, and the inner ring spline is arranged on the inner ring side of the connecting body and is connected with the turbine bearing through the inner ring spline.
Preferably, the worm gear tooth-shaped part is arranged into an annular structure, and an outer ring side of the worm gear tooth-shaped part adopts an enveloping tooth surface;
and a worm gear throat circle is arranged between adjacent enveloping tooth surfaces.
The enveloping tooth surface is an enveloping structure adopted by the tooth surface known in the art, and the enveloping structure can improve the contact area of the tooth surface, reduce the contact stress of the tooth surface load and avoid the pitting of the gear.
Preferably, the connector further comprises: the connecting body comprises a connecting body, a connecting body tooth-shaped structure, a first step and a second step;
The connector body is arranged to be of a circular ring structure, the first step and the second step are respectively arranged on two sides of the peripheral side face of the outer ring of the connector body, and the tooth-shaped structure of the connector is arranged between the first step and the second step.
Preferably, the outer ring side of the connecting body is interfered with the inner ring side of the worm gear tooth-shaped part in the circumferential direction through the tooth-shaped structure of the connecting body, and the first step and the second step are respectively positioned at two sides of the inner ring side of the worm gear tooth-shaped part and limit the axial movement of the worm gear tooth-shaped part.
Preferably, the connector body is provided with hollow structures uniformly distributed in the circumferential direction.
Preferably, the worm gear tooth-shaped part is made of polyether-ether-ketone, and the connector is made of nylon.
Preferably, a plurality of projections for interference are arranged on the inner ring spline and the connecting body tooth-shaped structure.
Compared with the prior art, the utility model has the following beneficial effects:
1. the worm gear is divided into a multi-layer structure of the worm gear tooth-shaped part and the connecting body, the connecting body made of nylon can bear very high torque, the torque requirement of an electric power steering gear of a commercial vehicle, a heavy-duty vehicle and the like is met, the fatigue strength of the worm gear tooth-shaped part made of polyether-ether-ketone is high, pitting corrosion and abrasion are resisted, and the life requirement of the whole automobile is met;
2. the application realizes low noise in the running process of the gear through the worm gear tooth-shaped part made of polyether-ether-ketone;
3. The application has simple production process, low cost and light weight.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a worm gear engaged;
FIG. 2 is a side view of a worm gear;
FIG. 3 is a cross-sectional view of the worm gear (A-A);
FIG. 4 is a schematic diagram of a connector structure;
The figure shows:
Detailed Description
The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.
Example 1
As shown in fig. 1, a worm wheel structure for an electric power steering system of an automobile includes: worm gear and metal worm 300; the worm wheel is meshed with the metal worm 300; the worm wheel includes: a worm gear tooth-shaped portion 100 and a connecting body 200; the connection body 200 is provided in an annular structure, the worm gear tooth-shaped portion 100 is provided on the outer circumferential side of the connection body 200, the inner ring spline 201 is provided on the inner ring side of the connection body 200, and the turbine bearing is connected through the inner ring spline 201. The worm gear tooth-shaped part 100 is made of polyether-ether-ketone, and the connector 200 is made of nylon.
As shown in fig. 2 and 3, the worm gear tooth-shaped portion 100 is provided in an annular structure, and an outer ring side of the worm gear tooth-shaped portion 100 employs an enveloping tooth surface 102; a worm gear throat 101 is disposed between adjacent enveloping tooth surfaces 102.
As shown in fig. 4, the connector 200 further includes: the connector body, the connector tooth structure 203, the first step 204 and the second step 205; the connector body is arranged to be of a circular ring structure, and hollow structures 202 which are uniformly distributed in the circumferential direction are arranged on the connector body. The two sides of the peripheral side surface of the outer ring of the connector body are respectively provided with a first step 204 and a second step 205, and a connector tooth-shaped structure 203 is arranged between the first step 204 and the second step 205. The inner ring spline 201 and the connector tooth-shaped structure 203 are provided with a plurality of protruding blocks for interference, the outer ring side of the connector 200 is interfered with the inner ring side of the worm gear tooth-shaped part 100 along the circumferential direction through the connector tooth-shaped structure 203, and the first step 204 and the second step 205 are respectively positioned at two sides of the inner ring side of the worm gear tooth-shaped part 100 and limit the axial movement of the worm gear tooth-shaped part 100.
In the embodiment, wear-resistant PEEK is adopted as the worm gear tooth-shaped part 100, so that the wear resistance and fatigue of the gear are improved; the glass fiber added nylon connector 200 with the spline is directly connected with the metal shaft with the spline, so that the structure is simpler; the cost is lower.
Example 2
Example 2 is a preferred example of example 1.
As shown in fig. 1, in order to develop a high torque and more economical EPS worm wheel, a blank of the worm wheel is developed once by means of two-shot molding by using polyether ether ketone (PEEK) and glass fiber reinforced nylon 66; the worm gear tooth-shaped part 100 is made of high-performance polyether-ether-ketone (PEEK) materials, and the fatigue performance and the high-load capacity of the PEEK under the high-temperature performance are utilized to improve the anti-tooth breaking capacity and the anti-pitting capacity of the worm gear; the glass fiber modified nylon 66 material is adopted in the part of the connector 200 which is linked with the worm gear tooth-shaped part 100 and the bearing, the glass fiber modified nylon 66 material can obtain very high Young modulus, the strength of the part is improved, meanwhile, the density is lighter than that of the scheme that a metal insert is adopted in the inner ring of the connector 200, the moment of inertia is reduced, and the load resistance of the tooth surface is improved.
As shown in fig. 2 to 4, the present embodiment includes a connector 200 made of glass fiber reinforced nylon 66 material (including, but not limited to, glass fiber reinforced nylon 6, glass fiber reinforced PA9T, or glass fiber reinforced nylon 6T, etc.) in which a polyether-ether-ketone worm gear tooth-shaped portion 100 is linked with a worm gear tooth-shaped portion, wherein a worm gear throat 101 and an enveloping tooth surface 102 of the worm gear tooth-shaped portion 100 adopt an enveloping worm design structure in order to increase the contact area between a worm gear and a metal worm 300, improve the load capacity of the worm gear tooth surface, and improve the pitting corrosion resistance of the worm gear under high-load working conditions.
The inner ring spline 201 of the connecting body 200 can be directly assembled with the turbine bearing in an interference manner, so that the quality of the whole turbine is reduced, and the processing technology is simplified; the hollowed-out structure 202 improves the strength of the connector 200 and reduces the weight of the connector 200; the purpose of the connector tooth form 203 is to link with the worm gear tooth form portion 100 providing sufficient rotational torque; the purpose of providing the first step 204 and the second step 205 on both sides is to prevent the play of the connection body 200 with the worm gear tooth-shaped portion 100 in the axial direction. The connecting body 200 is obtained in an injection molding mode, the worm gear tooth-shaped part 100 is subjected to secondary injection molding on the basis of the connecting body 200 to obtain a worm gear blank, and the worm gear blank is subjected to machining to obtain the worm gear throat circle 101 and the tooth-shaped part enveloped by the enveloping tooth surface 102, so that the novel EPS worm gear of the high-speed automobile electric steering system can be obtained.
Example 3
Taking the production of nylon 66 reinforced by PEEK and glass fibers as an example, the implementation of this example is as follows:
the first step: a connector 200 of injection molding glass fiber reinforced nylon 66;
Injection molding temperature of injection molding machine: the first section: 230-250 ℃, the second stage: 240-260 ℃, third stage: 260-280 ℃, nozzle: 280-290 ℃ and injection molding pressure: 50MPa to 200MPa;
and a second step of: preheating the connector 200 to 150-180 ℃ in an oven;
And a third step of: transferring the connector 200 of the injection molded glass fiber reinforced nylon 66 into a PEEK injection mold tool for secondary injection molding;
Mold temperature: 180-220 ℃;
Injection molding temperature of injection molding machine: the first section: 320-360 ℃, the second stage: 320-360 ℃, third stage: 320-360 ℃, nozzle: 350-370 ℃, injection molding pressure: 50MPa to 200MPa;
fourth step: removing injection molding pouring gates and burrs;
fifth step: the machining is carried out to the precision required by the gear according to the precision requirement of the worm gear.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the utility model. The embodiments of the utility model and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (8)
1. A worm gear structure, comprising: a worm wheel and a metal worm (300);
the worm wheel is meshed with the metal worm (300);
The worm wheel includes: a worm gear tooth-shaped portion (100) and a connecting body (200);
The connecting body (200) is of an annular structure, the worm gear tooth-shaped part (100) is arranged on the outer circumferential side of the connecting body (200), and the inner ring spline (201) is arranged on the inner ring side of the connecting body (200) and is connected with the turbine bearing through the inner ring spline (201).
2. The worm gear structure as recited in claim 1, wherein: the worm gear tooth-shaped part (100) is arranged into an annular structure, and an enveloping tooth surface (102) is adopted on the outer ring side of the worm gear tooth-shaped part (100);
a worm gear throat circle (101) is arranged between adjacent enveloping tooth surfaces (102).
3. The worm gear structure according to claim 1, characterized in that the connecting body (200) further comprises: the connector comprises a connector body, a connector tooth-shaped structure (203), a first step (204) and a second step (205);
The connector body is arranged to be of a circular ring structure, the first step (204) and the second step (205) are respectively arranged on two sides of the peripheral side face of the outer ring of the connector body, and the connector tooth-shaped structure (203) is arranged between the first step (204) and the second step (205).
4. A worm gear structure according to claim 3, wherein: the outer ring side of the connecting body (200) is in circumferential interference with the inner ring side of the worm gear tooth-shaped part (100) through the connecting body tooth-shaped structure (203), and the first step (204) and the second step (205) are respectively positioned on the two sides of the inner ring side of the worm gear tooth-shaped part (100) and limit the axial movement of the worm gear tooth-shaped part (100).
5. A worm gear structure according to claim 3, wherein: and hollow structures (202) uniformly distributed in the circumferential direction are arranged on the connector body.
6. The worm gear structure as recited in claim 1, wherein: the worm gear tooth-shaped part (100) is made of polyether-ether-ketone, and the connector (200) is made of nylon.
7. A worm gear structure according to claim 3, wherein: a plurality of protruding blocks for interference are arranged on the inner ring spline (201) and the connector tooth-shaped structure (203).
8. An electric power steering system for an automobile, characterized in that: the electric steering system of the automobile adopts the worm gear structure of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322676637.XU CN221188736U (en) | 2023-10-07 | 2023-10-07 | Worm wheel structure and automobile electric steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322676637.XU CN221188736U (en) | 2023-10-07 | 2023-10-07 | Worm wheel structure and automobile electric steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221188736U true CN221188736U (en) | 2024-06-21 |
Family
ID=91516372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322676637.XU Active CN221188736U (en) | 2023-10-07 | 2023-10-07 | Worm wheel structure and automobile electric steering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221188736U (en) |
-
2023
- 2023-10-07 CN CN202322676637.XU patent/CN221188736U/en active Active
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