Worm gear structure, worm gear and worm speed reducer, power-assisted steering system and vehicle

Abstract

The utility model relates to a worm gear structure for a worm and gear speed reducer, the worm and gear speed reducer, a power-assisted steering system and a vehicle. The worm gear structure for the worm gear and worm speed reducer comprises a worm gear body, the worm gear body is made of first metal and provided with a center hole, transmission teeth are arranged on the outer periphery of the worm gear body, and the outer surfaces of the transmission teeth are coated with wear-resistant layers; the annular piece is made of second metal and fixed in the center hole of the worm wheel body, and the strength of the second metal is larger than that of the first metal. The worm gear structure for the worm and gear speed reducer has the advantages of being simple in structure, low in manufacturing cost, stable in transmission, long in service life and the like.

Description

Technical Field

[0001] The present application belongs to the field of automotive parts, and specifically relates to a worm gear structure for a worm gear reduction device, a worm gear reduction device provided with the worm gear structure, a power steering system provided with the worm gear reduction device, and a vehicle equipped with the power steering system. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present disclosure. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present disclosure.

[0003] A worm gear reduction device uses the rotation of a worm to drive the rotation of a worm wheel, thereby reducing speed and increasing torque. It matches speed and transmits torque between the prime mover and the working machine or actuator. Specifically, a worm gear reduction device typically consists of a meshing connection between a worm and a worm wheel. The rotation of the worm drives the rotation of the worm wheel. The worm's speed is typically much greater than the worm wheel's speed, thus providing a speed reduction function. Utility Model Content

[0004] According to the present application, a worm gear structure for a worm gear reduction device is provided, the worm gear structure comprising:

[0005] a worm gear body made of a first metal and provided with a central hole, wherein the outer periphery of the worm gear body is provided with transmission teeth, and the outer surface of the transmission teeth is coated with a wear-resistant layer; and

[0006] An annular member is made of a second metal and fixed in the central hole of the worm gear body, wherein the second metal has a strength greater than that of the first metal.

[0007] Optionally, in the worm gear structure for the worm gear reduction device as described above, the wear-resistant layer is made of plastic and is coated on the outer surface of the transmission tooth by plastic coating.

[0008] Optionally, in the worm gear structure for the worm gear reduction device as described above, the wear-resistant layer is made of polyetheretherketone material; and / or

[0009] The worm wheel body is made of aluminum alloy, and the ring member is made of 16MnCrS5.

[0010] Optionally, in the worm gear structure for the worm gear reduction device as described above, the worm gear body is formed by forging.

[0011] Optionally, in the worm gear structure for a worm and worm gear reduction device as described above, a groove for weight reduction is provided on the side surface of the worm gear body.

[0012] Optionally, in the worm gear structure for a worm and worm gear reduction device as described above, the central hole of the worm gear body is formed by machining.

[0013] Optionally, in the worm gear structure for a worm and worm gear reduction device as described above, the annular member is press-fitted into the central hole of the worm gear body with an interference fit.

[0014] In addition, according to the present application, there is also provided a worm and worm gear reduction device, and the worm and worm gear reduction device is provided with the above-mentioned worm gear structure.

[0015] Furthermore, according to the present application, there is also provided an assisted steering system, and the assisted steering system is provided with the above-mentioned worm and worm gear reduction device.

[0016] In addition, according to the present application, there is also provided a vehicle, and the vehicle is configured with the above-mentioned assisted steering system.

[0017] It can be understood that the worm gear structure for a worm and worm gear reduction device of the present application has many advantages such as simple structure, low manufacturing cost, stable transmission, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Referring to the accompanying drawings, the disclosure of the present application will become more understandable. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present application. In addition, similar numbers in the drawings are used to represent similar components, where:

[0019] Figure 1 Exemplarily shown is a schematic structural diagram of a worm gear structure for a worm and worm gear reduction device disclosed according to the present application;

[0020] Figure 2 Exemplarily shown is a cross-sectional schematic diagram of a worm gear structure for a worm and worm gear reduction device disclosed according to the present application; and

[0021] Figure 3 Exemplarily shown is a partial enlarged cross-sectional schematic diagram of a worm gear structure for a worm and worm gear reduction device disclosed according to the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of specific embodiments of the present application will be provided in conjunction with the accompanying drawings. First of all, it should be noted that the orientation terms such as upper, lower, left, right, front, rear, inner, outer, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0023] In the present application, unless otherwise clearly specified and limited, terms such as "fixed" should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", "some examples", or "possible implementation manners" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0025] Those skilled in the art are aware that the worm and worm gear reduction device, as a basic mechanical transmission component, has important and extensive applications in the mechanical field. Especially in power transmission devices such as reduction motors and other equipment, the setting of the worm and worm gear reduction device is basically indispensable.

[0026] Figure 1 Shows a worm structure for a worm and worm gear reduction device disclosed according to the present application. From Figure 1 and Figure 2It can be clearly seen that the worm gear structure 10 includes a worm gear body 100 and an annular member 200. The worm gear body 100 is made of a first metal and is provided with a central hole 110. In addition, the worm gear body 100 is generally disc-shaped, and its outer peripheral edge is provided with transmission teeth 120, and the outer surface of the transmission teeth 120 is coated with a wear-resistant layer 121. The annular member 200 is made of a second metal and is fixed in the central hole 110 of the worm gear body 100, wherein the strength of the second metal is greater than that of the first metal. The inner ring of the annular member 200 is usually in interference fit with an intermediate shaft (not shown), so as to ensure the connection strength between the worm gear structure 10 and the intermediate shaft, and further achieve the purpose of torque transmission.

[0027] In the above embodiment, the wear-resistant layer 121 is made of plastic and is coated on the outer surface of the transmission teeth 120 by means such as plastic coating to improve its wear resistance. For example, the wear-resistant layer 121 is made of polyetheretherketone material. Those skilled in the art know that the polyetheretherketone material has advantages such as wear resistance and self-lubrication. In addition, the worm gear body 100 can be formed by forging to save manufacturing costs. Specifically, the worm gear body 100 can be pre-forged into a shape with transmission teeth 120, and a layer of polyetheretherketone material is coated on the outside of the transmission teeth 120, and the central hole 110 of the worm gear body 100 can be formed by machining and other means, which not only saves machining costs but also reduces the use cost of polyetheretherketone material. For another example, the worm gear body 100 can be made of aluminum alloy, and the annular member 200 can be made of 16MnCrS5. The worm gear body 100 made of aluminum alloy can play a good supporting role for the wear-resistant layer 121 made of polyetheretherketone material, so that the strength of the worm gear body 100 is significantly enhanced.

[0028] In order to further reduce the mass of the worm gear structure, a groove 130 for weight reduction is provided on the side surface of the worm gear body 100. In this way, not only can the overall weight of the worm gear speed reducer be reduced, but also it is very beneficial to save fuel consumption.

[0029] As an example, the annular member 200 can be fixed in the central hole 110 of the worm gear body 100 by means of interference press-fitting, so that the central hole 110 of the worm gear body 100 is in interference fit with the annular member 200, thereby fastening the two together.

[0030] In addition, the present application also provides a worm gear speed reducer, and the worm gear speed reducer is provided with the above worm gear structure 10 and a worm structure (not shown). The technical improvements and beneficial effects of the worm gear speed reducer are the same as those of the worm gear structure 10, so no detailed description will be made for the worm gear speed reducer.

[0031] In addition, the present application further provides an electric power steering system, and the electric power steering system is provided with the above-mentioned worm and worm gear reduction device.

[0032] Furthermore, the present application also provides a vehicle. The vehicle is configured with the above-mentioned electric power steering system. The vehicle can be various vehicles such as private cars, taxis, buses, minibuses or coaches.

[0033] In summary, according to the worm structure for the worm and worm gear reduction device of the present application, by using metal materials with different strengths, the strength of the worm structure can be improved, and the mass of the worm structure can be reduced, thereby reducing the overall weight of the worm and worm gear reduction device, and further reducing the weight of the entire electric power steering system. In addition, a wear-resistant layer is provided on the transmission teeth of the worm structure, thereby extending its service life.

[0034] The above has listed several specific embodiments to elaborate in detail the worm structure for the worm and worm gear reduction device of the present application, the worm and worm gear reduction device provided with the worm structure, the electric power steering system provided with the worm and worm gear reduction device, and the vehicle configured with the electric power steering system. These examples are only for illustrating the principle and its implementation manners of the present application, rather than limiting the present application. Without departing from the spirit and scope of the present application, those of ordinary skill in the art can also make various deformations and improvements. Therefore, all equivalent technical solutions should fall within the scope of the present application and be defined by the claims of the present application.

Claims

1. A worm wheel structure for a worm and worm gear reduction device, characterized in that, The worm gear structure (10) includes: A worm gear body (100) made of a first metal and provided with a central hole (110), and a transmission tooth (120) is provided on the outer peripheral edge of the worm gear body (100), and a wear-resistant layer (121) is coated on the outer surface of the transmission tooth (120); and An annular member (200) made of a second metal and fixed in the central hole (110) of the worm gear body (100), wherein the strength of the second metal is greater than that of the first metal.

2. The worm wheel structure for a worm and worm wheel reduction device according to claim 1, characterized in that, The wear-resistant layer (121) is made of plastic and is coated on the outer surface of the transmission tooth (120) by plastic coating.

3. The worm wheel structure for a worm and worm wheel reduction device according to claim 2, characterized in that, The wear-resistant layer (121) is made of polyetheretherketone material; and / or The worm gear body (100) is made of aluminum alloy, and the annular member (200) is made of 16MnCrS5.

4. The worm wheel structure for a worm and worm wheel reduction device according to any one of claims 1-3, characterized in that, The worm gear body (100) is formed by forging.

5. The worm wheel structure for a worm and worm wheel reduction device according to any one of claims 1-3, characterized in that, A groove (130) for weight reduction is provided on the side surface of the worm gear body (100).

6. The worm gear structure for a worm gear speed reduction device according to any one of claims 1 to 3, characterized in that, The central hole (110) of the worm gear body (100) is formed by machining.

7. The worm wheel structure for a worm and worm wheel reduction device according to any one of claims 1-3, characterized in that, The annular member (200) is press-fitted with interference into the central hole of the worm gear body (100).

8. A worm and worm gear reduction device, characterized in that, The worm gear and worm reduction device is provided with the worm gear structure (10) according to any one of claims 1-7.

9. A power steering system, characterized in that, The power steering system is provided with the worm gear and worm reduction device according to claim 8.

10. A vehicle, characterized in that, The vehicle is configured with the power steering system according to claim 9.

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