Foaming steering wheel and manufacturing method

Abstract

The embodiment of the invention provides a foaming steering wheel and a manufacturing method, the foaming steering wheel comprises a steering wheel framework, a foaming body and a functional pad, the foaming body is formed by placing the steering wheel framework in a foaming mold for foaming forming, comprises a hub part, a spoke part and a handle ring part, and comprises a primary foaming body and a secondary foaming body; the hub part and the spoke part are formed by the primary foaming body, a wrapping base face is formed on the handle ring part, the functional pad wraps the wrapping base face, the secondary foaming body is formed on the side, away from the wrapping base face, of the functional pad, and a circumferential closed contour of the handle ring part is formed or the secondary foaming body and the primary foaming body jointly form the circumferential closed contour of the handle ring part. According to the steering wheel, the hub part and the spoke part are formed through two-time foaming forming and one-time foaming, whether appearance defects which cannot be repaired exist in the appearance area of the hub part or not can be directly detected, waste of parts and production time can be reduced, part cost and production cost are saved, and production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steering wheels, and in particular to a foam steering wheel and a manufacturing method thereof. Background Art

[0002] Currently, when a steering wheel has a foam bottom cover and a heating function or a hand-off sensing function, a secondary foaming design structure is used to ensure the appearance of the product.

[0003] Conventional secondary foaming solution: first, the skeleton handle area is foamed once, then the functional pad is pasted on the primary foaming, and finally the secondary foaming is performed (the foaming area includes the steering wheel hub); during the final secondary foaming, if the steering wheel hub (such as the hub bottom cover) has appearance defects that cannot be repaired, it will result in a waste of parts and work hours. Summary of the invention

[0004] In view of this, the embodiments of this specification provide a foam steering wheel and a manufacturing method. The steering wheel is formed by two foaming processes and one foaming process to form the hub and the spoke. It is possible to directly detect whether there are any appearance defects in the appearance area of ​​the hub that cannot be repaired, thereby reducing the waste of parts and production hours, saving parts costs, production costs and improving production efficiency.

[0005] The embodiment of this specification provides the following technical solution: a foam steering wheel, comprising a steering wheel frame, a foam body and a functional pad, wherein the foam body is placed in a foaming mold by the steering wheel frame for foaming molding, and comprises a hub portion, a spoke portion and a handle portion,

[0006] The foam body includes a primary foam body and a secondary foam body. The primary foam body molds the hub portion and the spoke portion and forms a covering base surface on the handle ring portion. The functional pad is covered on the covering base surface. The secondary foam body is molded on the side of the functional pad away from the covering base surface to form a circumferential closed contour of the handle ring portion or form a circumferential closed contour of the handle ring portion together with the primary foam body.

[0007] Preferably, the handle ring portion also includes a sealing step portion formed by the primary foam body and having a first radius, the second radius of the coating base surface is smaller than the first radius, and the sealing step portion and the foaming mold together form a molding cavity for the secondary foam body.

[0008] Preferably, the sealing step portion is arranged at the junction of the spoke portion and the handle ring portion to form a continuous closed structure extending from the front side to the back side.

[0009] Preferably, the spoke portion comprises at least two spokes symmetrically arranged about the hub portion, and the sealing step portion is provided with two groups, and the two groups of sealing step portions respectively span all the spokes on both sides of the hub portion.

[0010] Preferably, the number of the spokes is four, the four spokes include two main spokes and two secondary spokes, and the two main spokes are respectively distributed at the three o'clock and nine o'clock positions of the handle.

[0011] Preferably, the primary foam body also includes a slot formed at the junction of the hub portion and the spoke portion and a wire groove extending from the handle portion along the secondary spoke to the slot, the wiring harness of the functional pad is at least partially embedded in the wire groove, and the slot is used to plug in the wiring harness connector of the functional pad.

[0012] Preferably, the foam steering wheel also includes foam and leather, and the edge of the sealing step portion extends outward to form a limiting protrusion, and a groove for accommodating the foam is formed between the limiting protrusion and the secondary foam body, the foam is embedded in the groove, and the leather is covered on the outside of the foam and the limiting protrusion.

[0013] A method for manufacturing a foam steering wheel, the method being used to manufacture the foam steering wheel as described in any one of the above, comprising:

[0014] The steering wheel frame is foamed and molded in a primary foaming mold to form a primary foam body, wherein the primary foam body comprises a spoke portion, a handle portion and a hub portion, and the handle portion is formed with a covering base surface for bonding a functional pad;

[0015] Bonding the functional pad onto the covering base surface to obtain a steering wheel semi-assembly;

[0016] The steering wheel semi-assembly is foamed in a secondary foaming mold to form a secondary foam body.

[0017] Preferably, the primary foam body further comprises a sealing step portion formed at the junction of the spoke portion and the handle ring portion, and the sealing step portion and the secondary foaming mold together form a molding cavity of the secondary foam body.

[0018] Preferably, after the step of bonding the functional pad onto the ring, the step further includes fixing the wiring harness of the functional pad to the spoke portion and fixing the wiring harness connector to the junction of the hub portion and the spoke portion.

[0019] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0020] The steering wheel is foamed twice. The hub and spoke parts are formed by the first foaming process. The appearance defects in the hub area that cannot be repaired can be directly inspected, which can reduce the waste of parts and production hours, save parts costs, production costs and improve production efficiency. At the same time, the first foaming process forms a covering base surface in the handle area, which is convenient for bonding functional pads. The functional pads are covered by the second foaming process, and the circumferential closed contour of the handle can be formed at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a front view of the foam steering wheel provided by the present application after one foaming;

[0023] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 This is a front view of the foam steering wheel provided by the present application after being covered with a functional pad;

[0025] Figure 4 yes Figure 3 Sectional view at the middle BB;

[0026] Figure 5 This is a front view of the foam steering wheel provided by the present application after secondary foaming;

[0027] Figure 6 yes Figure 5 Sectional view at CC;

[0028] Figure 7 is a schematic diagram of a sealing step portion of a foam steering wheel provided by the present application;

[0029] Figure 8 yes Figure 5 The enlarged schematic diagram of point a in the middle;

[0030] Fig. 9 yes Figure 8 Sectional view at DD in the middle;

[0031] Fig.10 is a rear view of the foam steering wheel provided by the present application after secondary foaming;

[0032] Fig.11 is a schematic diagram of the foam steering wheel provided by the present application after being coated with foam;

[0033] Fig.12 is a schematic diagram of the foam steering wheel provided by the present application after being covered with leather;

[0034] Fig.13 This is a schematic diagram of the foam steering wheel provided in the present application after the decorative parts are installed.

[0035] In the figure, 1. steering wheel frame; 2. primary foam; 21. handle ring; 22. spoke; 221. main spoke; 222. secondary spoke; 23. hub; 24. sealing step; 25. covering base surface; 26. wire groove; 27. slot; 3. functional pad; 31. wire harness; 32. wire harness connector; 4. secondary foam; 5. secondary foam mold; 6. foam; 7. leather; 8. decorative parts. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0038] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0039] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0040] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0041] In the prior art, the general technical ideas in the field of steering wheel technology formed by secondary foaming are as follows:

[0042] First, the skeleton handle area is foamed once, then the functional pad is attached to the primary foaming, and finally the secondary foaming is performed (the foaming area includes the steering wheel hub). However, in this solution, if the steering wheel hub (such as the wheel hub bottom cover) has an appearance defect that cannot be repaired during the final secondary foaming, it will lead to a waste of parts and work hours, and this solution requires a harness protective cover to fix the harness of the functional pad, which requires a large space.

[0043] The inventor has designed a foam steering wheel and a manufacturing method thereof after extensive and in-depth experiments.

[0044] More specifically, the solution adopted by the present invention includes: adopting a method that runs counter to the above-mentioned commonly used technical ideas, forming the hub part and the spoke part by foaming at one time, and directly detecting whether there are any appearance defects in the appearance area of ​​the hub part that cannot be repaired, thereby reducing the waste of parts and production hours, saving parts costs, production costs and improving production efficiency. At the same time, a slot for the wiring harness connector for plugging in the functional pad is formed in the hub part during one foaming, without the need for wiring harness protective cover auxiliary materials, saving costs and the space required for wiring harness sealing materials, and meeting customers' needs for smaller space styling.

[0045] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0046] like Figure 1-Figure 10 As shown, a foam steering wheel comprises a steering wheel frame 1, a foam body and a functional pad 3. The foam body is formed by placing the steering wheel frame 1 in a foaming mold for foaming, and comprises a hub portion 23, a spoke portion 22 and a handle ring portion 21.

[0047] The foam body includes a primary foam body 2 and a secondary foam body 4. The primary foam body 2 molds the hub portion 23 and the spoke portion 22, and forms a covering base surface 25 on the handle ring portion 21. The functional pad 3 is covered on the covering base surface 25. The secondary foam body 4 is molded on the side of the functional pad 3 away from the covering base surface 25 to form a circumferential closed contour of the handle ring portion 21 or form a circumferential closed contour of the handle ring portion 21 together with the primary foam body 2.

[0048] The hub portion 23, the spoke portion 22 and the handle ring portion 21 of the steering wheel are all formed by foaming, wherein the hub portion 23, the spoke portion 22 and partial areas of the handle ring portion 21 are formed during the primary foaming, and the hub portion 23 is directly foamed during the primary foaming, and there is no need to foam the hub portion 23 for the second time. At the same time, a covering base surface 25 for placing the functional pad 3 is formed in a partial area of ​​the handle ring portion 21 during the primary foaming, and the functional pad 3 can be covered on the covering base surface 25, and the wiring harness 31 of the functional pad 3 can be pulled to the hub portion 23 via the spoke portion 22, and there is no need to separately set a protective cover for fixing the wiring harness 31 of the functional pad 3. The secondary foaming is only performed on the handle ring portion 21, and the functional pad 3 is covered by the secondary foam body 4 formed by the secondary foaming, so that the functional pad 3 is between the covering base surface 25 and the secondary foam body 4, and at the same time, the handle ring portion 21 of the steering wheel is improved to form a circumferential closed contour of the handle ring portion 21.

[0049] It should be noted that since the hub portion 23 is directly foamed in one foaming process, if it is found that there are appearance defects in the appearance area of ​​the hub portion 23 that cannot be repaired, the one-time foam body 2 can be directly scrapped without the need for subsequent processes, thereby reducing the waste of parts and production hours, saving parts costs, production costs and improving production efficiency.

[0050] like Figure 3-Figure 7 As shown, in some embodiments, the handle ring portion 21 also includes a sealing step portion 24 having a first radius formed by the primary foam body 2, the second radius of the coating base surface 25 is smaller than the first radius, the sealing step portion 24 and the foaming mold jointly form a molding cavity of the secondary foam body 4, and a sealing step portion 24 with a first radius is formed on the handle ring portion 21 during the primary foaming molding, the second radius of the coating base surface 25 is smaller than the first radius, the functional pad 3 is bonded to the coating base surface 25, the outer periphery of the sealing step portion 24 is still higher than the outer surface of the functional pad 3, the portion of the sealing step portion 24 higher than the functional pad 3 cooperates with the foaming mold to form a molding cavity of the secondary foam body 4, the secondary foam body 4 fills the area between the sealing step portions 24, thereby forming a circumferential closed contour of the handle ring portion 21, and at the same time makes the functional pad 3 between the primary foam body 2 and the secondary foam body 4.

[0051] like Figure 3 , Figure 5 and Fig.10 As shown, in some embodiments, the sealing step portion 24 is arranged at the junction of the spoke portion 22 and the handle ring portion 21, forming a continuous closed structure extending from the front side to the back side. The sealing step is a continuous closed structure, which is located at the junction of the spoke portion 22 and the handle ring portion 21. During the secondary foaming, the area of ​​the sealing step away from the spoke portion 22 is improved to form a complete handle ring structure.

[0052] It should be noted that the junction between the spoke portion 22 and the handle ring portion 21 is generally the portion that the driver often holds. By forming a sealing step portion 24 in this area, the functional pad 3 can be concentrated in this area, ensuring the practicality of the installation position of the functional pad 3.

[0053] like Figure 6 As shown, it should also be noted that, during the secondary foaming, an interference structure is formed between the secondary foaming mold 5 and the sealing step 24, and the width of the sealing step 24 is greater than the width of the interference structure. In this embodiment, the width of the sealing step 24 is 4mm, and the secondary foaming mold 5 and the sealing step 24 form an interference structure of 3mm width and 0.5mm height. The remaining 1mm of the sealing step 24 does not cooperate with the secondary foaming mold 5, which can absorb the poor sealing caused by the tolerance between the single products. The foaming and sealing is performed through this structure, and the final finished product has no step marks caused by the sealing structure, and has no effect on the appearance of the steering wheel.

[0054] like Figure 5 As shown, in some embodiments, the spoke portion 22 includes at least two spokes symmetrically arranged about the hub portion 23, and the sealing step portion 24 is provided with two groups. The two groups of sealing step portions 24 respectively span all the spokes on both sides of the hub portion 23, and by providing at least one spoke on the left and right sides of the hub portion 23, respectively, sealing adjustment portions are formed on the left and right sides of the handle portion 21 by one foaming, and the sealing step portions 24 on the left and right sides respectively span all the spokes on the left and right sides of the hub portion 23, so that all the spokes are at least partially in the continuous closed structure formed by the sealing steps.

[0055] like Figure 5 and Figure 8-Figure 9As shown, in some embodiments, there are four spokes, and the four spokes include two main spokes 221 and two secondary spokes 222. The two main spokes 221 are respectively distributed at the three o'clock and nine o'clock positions of the handle ring portion 21. By setting two main spokes 221 and two secondary spokes 222, the two main spokes 221 are at the three o'clock and nine o'clock positions of the conventional handle ring portion 21, and physical buttons of the steering wheel can be installed on the main spokes 221. The positions of the two secondary spokes 222 can be set according to actual conditions, and it is only necessary to facilitate the wiring harness 31 of the traction function pad 3 to reach the wheel hub.

[0056] It should be noted that, in this embodiment, the two secondary spokes 222 are respectively located at approximately five o'clock and seven o'clock of the handle 21, so as to facilitate extending the two wire harnesses 31 of the functional pad 3 to the hub 23 via the secondary spokes 222. In other embodiments, the two secondary spokes 222 may also be respectively located at approximately one o'clock and eleven o'clock of the handle 21, which can be set according to actual conditions.

[0057] like Figure 5 and Figure 8-Figure 9 As shown, in some embodiments, the primary foam body 2 also includes a slot 27 formed at the junction of the hub portion 23 and the spoke portion 22 and a wire groove 26 extending from the handle portion 21 along the secondary spoke 222 to the slot 27, and the wiring harness 31 of the functional pad 3 is at least partially embedded in the wire groove 26, and the slot 27 is used to plug in the wiring harness connector 32 of the functional pad 3. During the primary foaming process, the slot 27 is directly formed at the junction of the hub portion 23 and the spoke portion 22, and before the secondary foaming, the wiring harness connector 32 of the functional pad 3 can be inserted into the slot 27. At the same time, during the primary foaming process, the wire groove 26 is directly formed on the secondary spoke 222, and the wiring harness 31 of the functional pad 3 can be embedded in the wire groove 26, without the need for an additional protective cover, thereby saving costs and the space required for sealing the wiring harness 31, and meeting customers' needs for smaller space styling.

[0058] like Figure 11-13 As shown, in some embodiments, the foam steering wheel also includes foam 6 and leather 7, and the edge of the sealing step portion 24 extends outward to form a limiting protrusion, and a groove for accommodating the foam 6 is formed between the limiting protrusion and the secondary foam body 4, and the foam 6 is embedded in the groove, and the leather 7 is covered on the outside of the foam 6 and the limiting protrusion. The edge area of ​​the sealing step portion 24 extends in a direction away from the steering wheel frame 1 to form a limiting protrusion, and the foam 6 is accommodated in the groove formed between the limiting protrusion and the secondary foam body 4, and the foam 6 is adhered to the handle ring portion 21 area of ​​the secondary foam body, and the outer end of the foam 6 is in contact with the limiting protrusion. The foam 6 can increase the softness of the handle ring portion 21 area, thereby improving the hand feel as required by customers.

[0059] See also Figure 1-Figure 13 Based on the same inventive concept, an embodiment of this specification provides a method for manufacturing a foam steering wheel, the method for manufacturing a foam steering wheel as described in any one of the above, comprising:

[0060] The steering wheel frame 1 is foamed in a primary foaming mold to form a primary foam body 2, wherein the primary foam body 2 includes a spoke portion 22, a handle portion 21 and a hub portion 23, and the handle portion 21 is formed with a covering base surface 25 for bonding the functional pad 3;

[0061] Bonding the functional pad 3 onto the covering base surface 25 to obtain a steering wheel semi-assembly;

[0062] The steering wheel half assembly is foamed in a secondary foaming mold 5 to form a secondary foam body 4 .

[0063] In practice, a foamed steering wheel is obtained by foaming twice. When the steering wheel skeleton 1 is placed in a primary foaming mold for primary foaming, the hub portion 23, the spoke portion 22 and a partial area of ​​the handle ring portion 21 are directly foamed. It can be checked whether there are defects in the hub portion 23 that cannot be repaired. At the same time, a slot 27 is formed at the junction of the hub portion 23 and the spoke portion 22, a wire groove 26 is formed on the spoke portion 22, and a partial area of ​​the handle ring portion 21 forms a covering base surface 25. The functional pad 3 is pasted on the covering base surface 25 by a sticky material such as glue or double-sided tape to obtain a To the steering wheel semi-assembly, place the steering wheel semi-assembly in the secondary foaming mold 5, perform secondary foaming on the handle ring part 21, and the secondary foam body 4 fits the outer surface of the functional pad 3. After the secondary foaming is completed, the circumferential closed contour of the handle ring part 21 is formed, and the foam 6 can be pasted on the handle ring area of ​​the secondary foam body 4 to improve the driver's grip feel. At the same time, leather 7 is covered on the outside of the handle ring part 21 to protect the handle ring part 21. Other parts such as decorative parts 8 can be assembled on the steering wheel covered with leather 7 to obtain a steering wheel assembly.

[0064] In some embodiments, the primary foam body 2 also includes a sealing step portion 24 formed at the junction of the spoke portion 22 and the handle ring portion 21, and the sealing step portion 24 and the secondary foaming mold 5 together form a molding cavity of the secondary foam body 4. During the first foaming, the sealing step portion 24 is formed at the junction of the spoke portion 22 and the handle ring portion 21. During the secondary foaming, the sealing step portion 24 and the secondary mold cooperate to form a molding cavity of the secondary foam body 4. The secondary foam body 4 is molded in the molding cavity and fills the area between the sealing step portions 24, thereby forming a circumferential closed contour of the handle ring portion 21.

[0065] In some embodiments, after the step of bonding the functional pad 3 on the ring, the step also includes fixing the wiring harness 31 of the functional pad 3 to the spoke portion 22 and fixing the wiring harness connector 32 to the junction of the hub portion 23 and the spoke portion 22. During the first foaming, a slot 27 is formed at the junction of the hub portion 23 and the spoke portion 22, and a wire groove 26 is formed on the spoke portion 22. When the functional pad 3 is pasted, the wiring harness 31 of the functional pad 3 can be embedded in the wire groove 26, and the wiring harness connector 32 can be inserted into the slot 27 to fix the wiring harness 31 and the wiring harness connector 32 of the functional pad 3.

[0066] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment described later, since it corresponds to the system, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A foam steering wheel, comprising a steering wheel frame, a foam body and a functional pad, wherein the foam body is placed in a foaming mold by the steering wheel frame for foaming molding, and comprises a hub portion, a spoke portion and a handle portion, characterized in that: The foam body includes a primary foam body and a secondary foam body. The primary foam body molds the hub portion and the spoke portion and forms a covering base surface on the handle ring portion. The functional pad is covered on the covering base surface. The secondary foam body is molded on the side of the functional pad away from the covering base surface to form a circumferential closed contour of the handle ring portion or form a circumferential closed contour of the handle ring portion together with the primary foam body.

2. The foam steering wheel according to claim 1, characterized in that: The handle ring portion also includes a sealing step portion formed by the primary foam body and having a first radius, the second radius of the covering base surface is smaller than the first radius, and the sealing step portion and the foaming mold together form a molding cavity for the secondary foam body.

3. The foam steering wheel according to claim 2, characterized in that: The sealing step portion is arranged at the junction of the spoke portion and the handle ring portion, forming a continuous closed structure extending from the front side to the back side.

4. The foam steering wheel according to claim 3, characterized in that: The spoke portion includes at least two spokes symmetrically arranged about the hub portion, and the sealing step portion is provided with two groups, and the two groups of sealing step portions respectively span all the spokes on both sides of the hub portion.

5. The foam steering wheel according to claim 4, characterized in that: There are four spokes, including two main spokes and two secondary spokes, and the two main spokes are respectively distributed at the three o'clock and nine o'clock positions of the handle.

6. The foam steering wheel according to claim 5, characterized in that: The primary foam body also includes a slot formed at the junction of the hub portion and the spoke portion and a wire groove extending from the handle portion along the secondary spoke to the slot, the wiring harness of the functional pad is at least partially embedded in the wire groove, and the slot is used to plug in the wiring harness connector of the functional pad.

7. The foam steering wheel according to claim 2, characterized in that: The foam steering wheel also includes foam and leather. The edge of the sealing step portion extends outward to form a limiting protrusion. A groove for accommodating the foam is formed between the limiting protrusion and the secondary foam body. The foam is embedded in the groove, and the leather is covered on the outside of the foam and the limiting protrusion.

8. A method for manufacturing a foam steering wheel, characterized in that: The manufacturing method is used to manufacture the foam steering wheel according to any one of claims 1 to 7, comprising: The steering wheel frame is foamed and molded in a primary foaming mold to form a primary foam body, wherein the primary foam body comprises a spoke portion, a handle portion and a hub portion, and the handle portion is formed with a covering base surface for bonding a functional pad; Bonding the functional pad onto the covering base surface to obtain a steering wheel semi-assembly; The steering wheel semi-assembly is foamed in a secondary foaming mold to form a secondary foam body.

9. The manufacturing method according to claim 8, characterized in that: The primary foam body further comprises a sealing step portion formed at the junction of the spoke portion and the handle ring portion, and the sealing step portion and the secondary foaming mold together form a molding cavity of the secondary foam body.

10. The manufacturing method according to claim 9, characterized in that: After the step of bonding the functional pad onto the handle, the method further includes fixing the wiring harness of the functional pad to the spoke portion and fixing the wiring harness plug connector to the junction of the hub portion and the spoke portion.

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