Steering wheel airbag module mounting structure

Abstract

A steering wheel airbag module mounting structure includes a steering wheel frame and an airbag housing, with at least three shock-absorbing units disposed between the steering wheel frame and the airbag housing. The shock-absorbing units include a fixing pin, a damping sleeve, and a return spring. The structure is characterized in that a guide hook, a receiving base, and a guide sleeve are sequentially disposed on the fixing pin from top to bottom. The guide hook passes through the damping sleeve and has first hooks evenly distributed around its lower end. The receiving base has first and second engaging windows evenly distributed, with the first hooks respectively engaging within corresponding first engaging windows. The guide sleeve is positioned and inserted into corresponding sockets on the steering wheel frame. Second hooks are evenly distributed around its upper end, engaging within corresponding second engaging windows and being able to slide along the second engaging windows. The return spring is disposed around the outer edge of the receiving base and clamped between the receiving base and the guide sleeve. This structure can effectively reduce or eliminate steering wheel vibration, improve driver grip comfort, and achieve excellent vibration reduction effects.

Description

Technical Field

[0001] The invention relates to the field of automobile steering wheels, and in particular to a steering wheel airbag module mounting structure. Background Art

[0002] The existing car steering wheel and airbag module are elastically connected by springs, and the vibration reduction effect is not obvious, and the vibration reduction structure cannot be directly expanded. For the problem of steering wheel vibration and abnormal noise, the only way is to increase the spring stiffness to reduce the relative movement of the steering wheel and the airbag module. However, this method will affect the pressure feel of the steering wheel horn, and it takes a lot of force to press the horn switch, and it also increases the sound of abnormal rebound of the horn contact.

[0003] Publication number CN214084154U discloses a steering wheel and airbag mounting structure, including a steering wheel frame and an airbag housing, with at least three groups of connecting components provided between the steering wheel frame and the airbag housing, and the connecting components are respectively limited by fixed retaining springs clamped under the steering wheel frame; the connecting components include a connecting bracket, a connecting hook, a horn spring and a support spring, the upper end of the connecting hook is movably clamped into a T-shaped slot provided on the bottom surface of the airbag housing and the movable gap is greater than the upper limit value of the horn contact stroke, the lower end of the connecting hook is inserted into a socket provided on the steering wheel frame and is clamped by a fixed retaining spring; the horn spring, the connecting bracket and the support spring are sequentially mounted on the connecting hook from top to bottom; the connecting bracket is movably clamped to the bottom of the airbag housing, and the movable gap is greater than the upper limit value of the horn contact stroke; the connecting bracket is fixedly clamped to the connecting hook.

[0004] This structure has the following problems:

[0005] 1. After the airbag housing is assembled to the steering wheel frame through the connecting assembly and the retaining spring, when the airbag module is pressed to activate the horn function, the airbag module as a whole undergoes a Z-axis return movement. At this time, the components being pressed are the shock absorber sleeve, support spring, and horn spring. The actual cumulative pressing stroke of these three components is much greater than the design-defined pressing stroke of the horn spring. This increased pressing stroke of the three components affects the user experience.

[0006] 2. From a technical perspective, this structure requires the combined effect of a support spring and a damping sleeve to achieve shock absorption. However, fluctuations in the stiffness of the support spring and the hardness of the damping sleeve will cause large fluctuations in the output frequency. The speaker spring, as the terminal support, will also affect the actual effect of the entire shock absorption, seriously affecting the end-user experience and causing numbness when holding the steering wheel.

[0007] 3. After installation, the airbag module as a whole can achieve Z-direction displacement relative to the steering wheel frame, and the rubber ring is installed at the top of the connecting hook 5. The rubber ring has adsorption properties due to the high friction coefficient of the rubber material. When the airbag module is pressed in the Z direction, the rubber ring is easily caused to fall off, resulting in the airbag module having no effective XY plane limit when installed in the steering wheel frame, making the airbag module loose, causing the peripheral structure of the airbag module to directly collide with the surrounding matching structure of the steering wheel, producing abnormal noise. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a steering wheel airbag module installation structure with good vibration reduction effect, which can reduce or eliminate steering wheel vibration and improve driving hand grip comfort; at the same time, it can reduce the impact sound when using the horn.

[0009] The technical solutions of the present invention are as follows:

[0010] A steering wheel airbag module mounting structure includes a steering wheel frame and an airbag housing for mounting the airbag module. At least three groups of shock-absorbing units are provided between the steering wheel frame and the airbag housing. The shock-absorbing units are respectively limited by fixed retaining springs clamped under the steering wheel frame to achieve Z-axis positioning of the airbag module and prevent detonation and disengagement. The shock-absorbing units include a fixing pin, a damping sleeve, and a return spring. The damping sleeve is embedded in a mounting hole in the airbag housing. The special feature of the structure is that a guide hook, a receiving base, and a guide sleeve are sequentially sleeved on the fixing pin from top to bottom.

[0011] The guide hook passes through the damping sleeve and has first hooks evenly distributed around the circumference of its lower end. The receiving base has first and second latching windows evenly distributed along the circumference and arranged alternately. The first hooks are inserted into the receiving base and respectively latched in the corresponding first latching windows, so that the upper end of the receiving base rests against the lower end of the damping sleeve and is connected to the airbag housing as a whole.

[0012] The guide sleeve is positioned and inserted into the corresponding socket on the steering wheel frame, and second hooks are evenly distributed on the circumference of the upper end of the guide sleeve. After the second hooks are inserted into the receiving base, they are respectively clamped in the corresponding second clamping windows and can slide along the second clamping windows, which are used to limit the XY direction freedom of the receiving base and the guide sleeve; the reset spring sleeve is arranged on the outer edge of the receiving base and clamped between the receiving base and the guide sleeve, which is used to realize elastic support of the airbag module and automatic reset after the horn is pressed.

[0013] As a further preference, an upper conductive plate is preset in the receiving base, one end of the upper conductive plate is located at the lower end surface of the receiving base, and the other end of the upper conductive plate is led out from one side of the receiving base to form a connector for connecting the speaker wiring harness.

[0014] As a further preference, a lower conductive sheet is preset in the guide sleeve, the upper end of the lower conductive sheet is annular and has trapezoidal protrusions evenly distributed around the circumference, which is used to contact the upper conductive sheet to achieve conduction of the speaker circuit; the lower part of the lower conductive sheet is provided with multiple patches evenly distributed around the circumference of the guide sleeve, and the patches are fitted with the outer edge of the fixing pin to achieve conduction of the speaker circuit.

[0015] As a further preference, anti-retreat hooks are evenly distributed on the circumference of the lower end of the guide sleeve, and an anti-retreat ring groove is provided at the lower part of the fixed pin. The anti-retreat hooks are inserted into the anti-retreat ring groove to prevent the fixed pin from retreating and falling off.

[0016] As a further preference, the insertion hole on the steering wheel skeleton is a tapered hole, and the lower outer edge of the guide sleeve is tapered and matches the taper of the insertion hole to facilitate installation and positioning and improve structural stability.

[0017] As a further preference, corresponding mounting holes on the airbag housing are respectively provided with overmolded parts, the middle part of the outer edge of the damping sleeve is provided with an annular groove, and the damping sleeve is clamped on the upper and lower sides of the overmolded part through the annular groove; an annular boss is provided in the middle part of the outer edge of the damping sleeve corresponding to the annular groove, so that the damping sleeve forms an annular cavity structure with the overmolded part after assembly, which is used to effectively absorb and reset the pressure feed effect.

[0018] As a further preference, the upper end of the guide hook is provided with an annular clamping edge and pressed on the upper end face of the damping sleeve, and stepped countersunk holes are respectively provided on the upper and lower ends of the damping sleeve, so that the damping sleeve forms an annular cavity structure with the guide hook and the receiving base after assembly, which is used to effectively absorb and reset the pressure feed effect.

[0019] As a further preference, two positioning columns are provided on the outer periphery of the mounting hole on the overmolded part, and two hanging ears are provided on the upper end of the outer edge of the damping sleeve. The hanging ears are provided with positioning holes and are respectively connected to the positioning columns to achieve circumferential limitation of the damping sleeve.

[0020] As a further preference, two card grooves are arranged along the circumferential direction on the lower end surface of the damping sleeve, and two card platforms are arranged along the circumferential direction on the upper end surface of the receiving base, and the card platforms are respectively inserted into the corresponding card grooves to achieve installation positioning of the receiving base; bosses are evenly distributed on the circumference of the inner wall of the damping sleeve, and grooves are evenly distributed on the circumference of the lower end of the outer wall of the guide hook, and the bosses are respectively inserted into the corresponding grooves to achieve installation positioning and circumferential limitation of the guide hook.

[0021] As a further preference, annular bosses are respectively provided on the upper and lower end faces of the overmolded part near the inner edge of the mounting hole, and the inner and outer edges of the annular bosses are both conical surfaces, which can cooperate with the annular groove of the damping sleeve to achieve glue overflow when the damping sleeve is squeezed, thereby increasing the variable modulus of the airbag module.

[0022] The beneficial effects of the present invention are:

[0023] 1. Since each set of shock-absorbing units includes a fixing pin, a damping sleeve, and a return spring, the damping sleeve is embedded in the mounting hole on the airbag housing, and a guide hook, a receiving base, and a guide sleeve are sequentially sleeved on the fixing pin from top to bottom. The guide hook passes through the damping sleeve and is inserted into the receiving base through first hooks evenly distributed around the circumference and is respectively clamped in the corresponding first clamping windows, so that the upper end of the receiving base rests on the lower end of the damping sleeve and is connected to the airbag housing as a whole; the guide sleeve is positioned and inserted into the corresponding insertion hole on the steering wheel frame, and the second hook at the upper end is inserted into the receiving base and is respectively clamped in the corresponding second clamping window, thereby limiting the XY direction freedom of the receiving base and the guide sleeve, so that the airbag module can achieve XY direction freedom limitation with the steering wheel frame through multiple sets of shock-absorbing units, and can avoid the peripheral structure of the airbag module directly colliding with the peripheral matching structure of the steering wheel to produce abnormal noise;

[0024] 2. Since the reset spring sleeve is arranged on the outer edge of the receiving base and clamped between the receiving base and the guide sleeve, it can realize elastic support of the airbag module and automatic reset after the horn is pressed. At the same time, it cooperates with the damping sleeve embedded in the mounting hole of the airbag shell. Structurally speaking, the horn pressing stroke is superimposed by the reset spring and the damping sleeve. By making the compression amount of the reset spring and the pressure feed amount of the damping sleeve correspond to the reference value and tolerance band of the horn pressing stroke respectively, it ensures that the design of the horn pressing stroke is consistent with the actual situation, effectively reducing or eliminating the steering wheel vibration, improving the driving hand grip comfort, and having good vibration reduction effect. It is smooth and has a better perception evaluation during use.

[0025] 3. Since the damping sleeve is designed to be embedded in the mounting hole of the airbag housing, and there are no other spring parts around the airbag housing to support the airbag housing after the damping sleeve is installed, when resonance occurs in actual vehicle use, it will directly act on the pressure feedback of the damping sleeve. In this way, in product application, it is only necessary to control the quality of the damping sleeve alone to ensure the resonant frequency output value of the airbag module assembly, so that the product has a controllable frequency range value, thereby improving the actual use perception and customer experience.

[0026] 4. Since the guide sleeve, supporting base, damping sleeve and fixing pin involved in the shock-absorbing unit are all universal parts with the same structure, rather than using the mirror-image design concept, the tooling, inspection fixtures and molds involved in the development of the guide sleeve, supporting base, damping sleeve and fixing pin only need to be one set. There is no need to develop more corresponding tooling, inspection fixtures and molds according to the mirror-image concept. Therefore, this design can save development costs when applied. After the product is assembled, the product size and performance are highly consistent, the stability is better, and the actual benefits of product development and use are improved.

[0027] 5. This structural design can achieve the desired effects for different vehicle models by adjusting the hardness of the damping sleeve, greatly reducing customer complaints caused by unstable factors in the new product structural design, increasing the universality rate, and reducing the cost increase caused by multi-mode development.

[0028] 6. The present invention sets the speaker contact position on the guide sleeve and the receiving base respectively, which can effectively avoid the problem of uncontrollable travel caused by setting the speaker contact position separately on the airbag assembly and the steering wheel assembly in the past. In addition, this structure wraps the speaker conductive sheet in the guide sleeve and the receiving base respectively, which can reduce the impact sound and improve the evaluation of abnormal noise in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0030] Figure 2 yes Figure 1 rear view.

[0031] Figure 3 yes Figure 1 Bottom view of .

[0032] Figure 4 yes Figure 1 AA partial cross-sectional view.

[0033] Figure 5 yes Figure 3 BB cross-sectional view.

[0034] Figure 6 It is a structural diagram of the guide hook.

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the damping sleeve.

[0036] Figure 8 It is a structural cross-sectional view of the damping sleeve.

[0037] Figure 9 It is a structural diagram of the supporting base.

[0038] Figure 10 、 11 It is a structural diagram of the guide sleeve.

[0039] Figure 12 It is a three-dimensional structural diagram of a shock absorbing unit.

[0040] In the figure: fixing pin 1, guide hook 2, damping sleeve 3, airbag housing 4, overmolded part 5, receiving base 6, return spring 7, steering wheel frame 8, guide sleeve 9, lower conductive sheet 10, upper conductive sheet 11, cavity structure 12, fixing retaining spring 13, speaker wiring harness 14;

[0041] Anti-retraction ring groove 101, limiting card slot 102, first hook 201, annular card edge 202, groove 203, hanging ear 301, positioning hole 302, card slot 303, through hole 304, boss 305, annular groove 306, annular boss 307, stepped countersunk hole 308, annular boss 501, first card window 601, second card window 602, card platform 603, jack 801, second hook 901, anti-retraction hook 902, trapezoidal protrusion 1001, patch 1002. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figures 1-12 As shown, the present invention relates to a steering wheel airbag module mounting structure, comprising a steering wheel skeleton 8 and an airbag housing 4 for mounting the airbag module. At least three groups of shock-absorbing units are provided between the steering wheel skeleton 8 and the airbag housing 4. This embodiment takes four groups of shock-absorbing units as an example and they are symmetrically arranged in the mounting holes on both sides of the airbag housing 4. Each group of shock-absorbing units is limited by a fixed retaining spring 13 clamped under the steering wheel skeleton 8, so as to realize the Z-direction positioning and detonation prevention of the airbag module.

[0045] A molded part 5 is provided in each mounting hole on the airbag housing 4. Each molded part 5 tightly wraps the upper and lower ends and inner edge of the corresponding mounting hole. The two molded parts 5 located on the same side of the airbag housing 4 are connected as one. A number of process holes are provided on the airbag housing 4 outside each mounting hole to enable the molded part 5 to pass through during the injection molding process, thereby increasing the stability of the combination of the two.

[0046] Two positioning columns are injection-molded at the upper end of the overmolded part 5, located outside the mounting hole. Annular bosses 501 are respectively provided on the upper and lower end faces of the overmolded part 5, close to the inner edge of the mounting hole. The inner and outer edges of the annular bosses are both conical surfaces, which can cooperate with the annular groove of the damping sleeve 3 to achieve glue overflow when the damping sleeve 3 is squeezed, thereby increasing the variable modulus of the airbag module.

[0047] The shock absorbing unit includes a fixing pin 1, a damping sleeve 3 and a reset spring 7. The damping sleeve 3 is made of silicone or rubber and is embedded in the overmolded part 5 in each mounting hole on the airbag housing 4. Two hanging ears 301 are provided at the upper end of the outer edge of the damping sleeve 3. The hanging ears 301 are provided with positioning holes 302 and are respectively plugged into the positioning columns to achieve circumferential limitation of the damping sleeve 3; an annular groove 306 is provided in the middle of the outer edge of the damping sleeve 3, and is clamped on the upper and lower sides of the overmolded part 5 through the annular groove 306; an annular boss 307 is provided in the middle of the outer edge corresponding to the annular groove on the damping sleeve 3, so that the damping sleeve 3 forms an annular cavity structure 12 with the overmolded part 5 after assembly, which is used to effectively absorb and reset the pressure feed effect; through holes 304 are evenly distributed along the circumferential direction at both ends of the damping sleeve 3, which can realize glue overflow during use and increase the buffering and absorption effect.

[0048] A guide hook 2, a receiving base 6, and a guide sleeve 9 are sequentially sleeved on the fixing pin 1 from top to bottom. The guide hook 2 passes through the damping sleeve 3 and has three first hooks 201 evenly distributed along the circumferential direction on its lower end. Three first engaging windows 601 and three second engaging windows 602 are evenly distributed along the circumferential direction on the receiving base 6, and are staggered with each other. The second engaging windows are longer than the first engaging windows. The first hooks 201 are inserted into the receiving base 6 and respectively engaged in the corresponding first engaging windows 601, so that the upper end of the receiving base 6 rests against the lower end of the damping sleeve 3 and is integrally connected to the airbag housing 4.

[0049] The guide sleeve 9 is positioned and inserted into the corresponding socket 801 on the steering wheel skeleton 8. The socket is a tapered hole. The lower outer edge of the guide sleeve 9 is tapered and matches the taper of the socket 801 to facilitate installation and positioning and improve structural stability. Three second hooks 901 extending upward are evenly distributed along the circumferential direction on the inner edge of the upper end of the guide sleeve 9. The second hooks 901 are opposite to the direction of the first hooks 201. After the second hooks 901 are inserted into the receiving base 6, they are respectively clamped in the corresponding second clamping windows and can slide upward along the second clamping windows 602 to limit the XY direction freedom of the receiving base 6 and the guide sleeve 9. The reset spring 7 is sleeved on the outer edge of the receiving base 6 and clamped between the stepped clamping edge at the upper end of the receiving base 6 and the guide sleeve 9 to achieve elastic support for the airbag module and automatic reset after the horn is pressed.

[0050] Three inward-extending anti-retraction hooks 902 are evenly distributed around the lower circumference of the inner guide sleeve 9. A vertical anti-retraction ring groove 101 and a retaining clip 102 are located on the lower outer edge of the fixing pin 1. The anti-retraction hooks 902 are inserted into the anti-retraction ring groove to prevent the fixing pin 1 from falling out. After passing through the guide sleeve 9 and the insertion hole, the lower end of the fixing pin 1 is axially restrained by a retaining spring 13 engaged in the retaining clip. The retaining spring 13 is attached to the steering wheel frame 8 to ensure electrical continuity of the speaker's negative terminal. The lower end of the fixing pin 1 has a tapered head for easier installation.

[0051] An upper conductive plate 11 is preset in the receiving base 6. One end of the upper conductive plate 11 is annular and located at the lower end surface of the receiving base 6. The other end of the upper conductive plate 11 is led out from one side of the receiving base 6 to form a connector 1101 for connecting to the positive pole of the speaker harness 14.

[0052] A lower conductive sheet 10 is preset in the guide sleeve 9. The upper end of the lower conductive sheet 10 is annular and has trapezoidal protrusions 1001 evenly distributed along the circumferential direction. The trapezoidal protrusions 1001 are led out from the top surface of the guide sleeve 9 and are used to contact the upper conductive sheet 11 to achieve conduction of the speaker circuit; the lower part of the lower conductive sheet 10 is evenly distributed on the circumference of the guide sleeve 9 with multiple patches 1002, which are fitted with the outer edge of the fixing pin 1 to achieve conduction of the speaker circuit.

[0053] The upper end of the guide hook 2 is provided with an annular clamping edge 202 and is pressed against the upper end surface of the damping sleeve 3. Stepped countersunk holes 308 are respectively provided on the upper and lower ends of the damping sleeve 3, so that after the damping sleeve 3 is assembled, it forms an annular cavity structure 12 with the guide hook 2 and the receiving base 6 for effectively absorbing and resetting the pressure feed effect.

[0054] Two card grooves 303 are arranged along the circumferential direction on the lower end surface of the damping sleeve 3, and two card platforms 603 are arranged along the circumferential direction on the upper end surface of the receiving base 6. The card platforms 603 are respectively inserted into the corresponding card grooves to achieve the installation positioning of the receiving base 6; three bosses 305 are evenly distributed on the circumference of the inner wall of the damping sleeve 3, and three grooves 203 are evenly distributed on the circumference of the lower end of the outer wall of the guide hook 2. The bosses are respectively inserted into the corresponding grooves 203 to achieve the installation positioning and circumferential limitation of the guide hook 2.

[0055] During operation, the guide hook 2 passes through the damping sleeve 3 and is inserted into the receiving base 6 through the first hooks 201 evenly distributed around the circumference and are respectively clamped in the corresponding first clamping windows, so that the upper end of the receiving base 6 is against the lower end of the damping sleeve 3 and is connected to the airbag housing 4 as a whole; the reset spring 7 is sleeved on the outer edge of the receiving base 6 and clamped between the receiving base 6 and the guide sleeve 9, which can realize elastic support of the airbag module and automatic reset after the horn is pressed. At the same time, in conjunction with the damping sleeve 3 embedded in the mounting hole of the airbag housing 4, it can effectively reduce or eliminate steering wheel vibration, improve driving hand grip comfort, have good vibration reduction effect, and be smooth and have a better perception evaluation during use.

[0056] Example 2

[0057] The present invention relates to a steering wheel airbag module mounting structure. Based on Example 1, the guide hook 2, damping sleeve 3, and overmolded component 5 form an integrated overmolded structure, directly overmolded within the mounting hole of the airbag housing 4. This structure is designed for use as a non-shock-absorbing product. The remaining structures of this embodiment are the same as those of Example 1 and are not further described in detail.

[0058] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A steering wheel airbag module mounting structure, comprising a steering wheel frame and an airbag housing for mounting the airbag module. At least three sets of damping units are disposed between the steering wheel frame and the airbag housing. The damping units are each limited in position by a fixed retaining spring clipped onto the underside of the steering wheel frame, thereby achieving Z-axis positioning of the airbag module and preventing it from detonating and dislodging. The damping units comprise a fixing pin, a damping sleeve, and a return spring. The damping sleeve is embedded in a mounting hole in the airbag housing. The structure is characterized by: A guide hook, a receiving base and a guide sleeve are sequentially sleeved on the fixing pin from top to bottom; The guide hook passes through the damping sleeve and has first hooks evenly distributed around the circumference of its lower end. The receiving base has first and second latching windows evenly distributed along the circumference and arranged alternately. The first hooks are inserted into the receiving base and respectively latched in the corresponding first latching windows, so that the upper end of the receiving base rests against the lower end of the damping sleeve and is connected to the airbag housing as a whole. The guide sleeve is positioned and inserted into the corresponding socket on the steering wheel frame. Second hooks are evenly distributed around the circumference of the upper end of the guide sleeve. After the second hooks are inserted into the receiving base, they are respectively clamped in the corresponding second clamping windows and can slide along the second clamping windows to limit the XY direction freedom of the receiving base and the guide sleeve. The return spring is arranged on the outer edge of the receiving base and clamped between the receiving base and the guide sleeve to achieve elastic support for the airbag module and automatic reset after the horn is pressed. Overmolded parts are provided in the corresponding mounting holes on the airbag housing, and an annular groove is provided in the middle of the outer edge of the damping sleeve, and the damping sleeve is clamped on the upper and lower sides of the overmolded part through the annular groove; an annular boss is provided in the middle of the outer edge of the damping sleeve corresponding to the annular groove, so that the damping sleeve forms an annular cavity structure with the overmolded part after assembly, which is used to effectively absorb and reset the pressure feedback effect; The upper end of the guide hook is provided with an annular clamping edge and pressed on the upper end surface of the damping sleeve. Stepped countersunk holes are respectively provided on the upper and lower ends of the damping sleeve, so that the damping sleeve forms an annular cavity structure with the guide hook and the receiving base after assembly, which is used to effectively absorb and reset the pressure feed effect.

2. A steering wheel airbag module mounting structure according to claim 1, characterized in that: An upper conductive sheet is preset in the receiving base, one end of the upper conductive sheet is located at the lower end surface of the receiving base, and the other end of the upper conductive sheet is led out from one side of the receiving base to form a connector for connecting the speaker wiring harness.

3. The steering wheel airbag module mounting structure according to claim 2, characterized in that: A lower conductive sheet is preset in the guide sleeve. The upper end of the lower conductive sheet is annular and has trapezoidal protrusions evenly distributed around the circumference, which is used to contact the upper conductive sheet to achieve conduction of the speaker circuit; the lower part of the lower conductive sheet is evenly distributed around the circumference of the guide sleeve with multiple patches, which are fitted with the outer edge of the fixing pin to achieve conduction of the speaker circuit.

4. A steering wheel airbag module mounting structure according to any one of claims 1 to 3, characterized in that: Anti-retraction hooks are evenly distributed on the circumference of the lower end of the guide sleeve, and an anti-retraction ring groove is provided at the lower part of the fixed pin. The anti-retraction hooks are inserted into the anti-retraction ring groove to prevent the fixed pin from withdrawing and falling off.

5. The steering wheel airbag module mounting structure according to claim 1, characterized in that: The insertion hole on the steering wheel frame is a tapered hole, and the lower portion of the outer edge of the guide sleeve is tapered and matches the taper of the insertion hole, so as to facilitate installation and positioning and improve structural stability.

6. A steering wheel airbag module mounting structure according to claim 1, characterized in that: Two positioning columns are provided on the plastic-coated part at the periphery of the mounting hole, and two hanging ears are provided on the upper end of the outer edge of the damping sleeve. The hanging ears are provided with positioning holes and are respectively plugged with the positioning columns to achieve circumferential limitation of the damping sleeve.

7. A steering wheel airbag module mounting structure according to claim 1 or 6, characterized in that: Two card grooves are arranged along the circumferential direction on the lower end surface of the damping sleeve, and two card platforms are arranged along the circumferential direction on the upper end surface of the receiving base. The card platforms are respectively inserted into the corresponding card grooves to realize the installation positioning of the receiving base; bosses are evenly distributed on the circumference of the inner wall of the damping sleeve, and grooves are evenly distributed on the circumference of the lower end of the outer wall of the guide hook. The bosses are respectively inserted into the corresponding grooves to realize the installation positioning and circumferential limitation of the guide hook.

8. The steering wheel airbag module mounting structure according to claim 1 or 6, characterized in that: Annular bosses are provided on the upper and lower end faces of the overmolded part near the inner edge of the mounting hole. The inner and outer edges of the annular bosses are both conical surfaces, which are used to prevent glue overflow when the damping sleeve is extruded, thereby increasing the variable modulus of the airbag module.

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