Silencing rotating shaft structure for vehicle-mounted air outlet

Abstract

The utility model relates to the technical field of automotive interior parts, and concretely relates to a mute rotating shaft structure for a vehicle-mounted air outlet, comprising: a shaft sleeve structure, the shaft sleeve structure is structured as an annular structure, the annular structure is greater than the outer diameter of target rotating shaft, a plurality of connecting pieces, the first end of connecting piece is connected to the inner wall of shaft sleeve structure, and the second end extends to the surface of target rotating shaft. The utility model discloses that the rotating shaft structure's shaft sleeve inboard sets up elastic contact piece, and through the elastic compensation of elastic structure, can keep the sustained and relatively constant pressure to rotating shaft, namely has the sustained radial pre-tightening force, can eliminate the abnormal sound of traditional gap fit because of loosening, and simultaneously, it also has excellent energy absorption and damping characteristics, effectively inhibits the high-frequency vibration and plastic friction noise in the rotating process, and the user can feel the uniform, linear and light resistance change when operating.

Description

Technical Field

[0001] This utility model relates to the field of automotive interior parts technology, and more specifically to a silent rotating shaft structure for vehicle air vents. Background Technology

[0002] In shaping the refined style and immersive experience of modern car cabins, interior functional components play a crucial role, especially high-frequency touch-sensitive details such as the air conditioning vent blade adjustment mechanism. Every touch of the user's fingertips to the knobs or paddles, every subtle adjustment to the airflow direction and volume, carries a direct judgment on the sense of quality and enjoyment.

[0003] Engineers aim to provide users with a better user experience. This requires the initial resistance to opening, closing, or adjusting to be just right, the rotation process to be as smooth and fluid as silk, the force to be even, and the absence of any stuttering or jumping sensation. Furthermore, it requires that each operation deliver a calm, steady, and quiet feedback without any noise. This is not only about functionality, but also about the cabin temperature and sense of luxury that users can perceive at the fingertips.

[0004] However, the core of achieving this user experience—the pivot support structure—has long been constrained by a fundamental physical contradiction. Excessive tightness can avoid noise issues in the shaft-hole fit, but it also increases friction, affecting opening time and operational smoothness. A clearance fit reduces friction, ensuring stable opening time and smooth operation, but introduces vibration and noise problems. An over-fit requires a very small tolerance window, posing a significant challenge to process control. Summary of the Invention

[0005] To address the technical problems existing in automotive interior hinge components in the prior art, this utility model proposes a silent hinge structure for vehicle air vents, comprising: A bushing structure, wherein the bushing structure is configured as a ring structure, and the ring structure is larger than the outer diameter of the target rotating shaft; Multiple connectors, wherein a first end of each connector is connected to the inner wall of the bushing structure and a second end extends toward the surface of the target rotating shaft; Multiple contacts, including at least one connecting end and one contact end, the connecting end being connected to a second end of one or more of the connecting ends, the contact end extending toward the surface of the target shaft; The contact element is configured to be elastically connected to the connector, so that the contact end can change the distance from the center of the bushing structure under radial pressure, and the inner circle diameter D1 of the contact ends of the plurality of contact elements is smaller than the outer diameter D2 of the target shaft.

[0006] Preferably, at least one stress concentration area is provided between the contact end of the connector and the contact member, and when the contact end of the contact member is compressed, the stress concentration area will deform preferentially.

[0007] Preferably, the structural component thickness / cross-sectional dimensions in the stress concentration region are smaller than those in other regions.

[0008] Preferably, the connector is configured as a rod-shaped structure extending radially from the inner wall of the bushing structure toward the target pivot direction.

[0009] Preferably, the contact element is configured to include a first arc-shaped structure and a second arc-shaped structure, a first end of the first arc-shaped structure is connected to the end of the connector, the second arc-shaped structure is connected to the end of the first arc-shaped structure, and the second arc-shaped structure forms a contact end with the contact area of ​​the target rotating shaft.

[0010] Preferably, the center of the first arc-shaped structure is the same as the center of the bushing structure, and the bending direction of the second arc-shaped structure is opposite to the bending direction of the first arc-shaped structure.

[0011] Preferably, the bushing structure, connecting parts, and contact parts are integrally injection molded.

[0012] Preferably, the bushing structure, connector, and contact are made of nylon.

[0013] Preferably, the diameter difference between D1 and D2 is less than 10% of D2.

[0014] Compared with the prior art, the advantages of this utility model are: The rotating shaft structure proposed in this utility model has an elastic contact element on the inner side of the bushing. Through the elastic compensation of the elastic structure, it can maintain a continuous and relatively constant pressure on the rotating shaft, that is, it has a continuous radial preload force, which can eliminate the abnormal noise caused by loosening in traditional clearance fits. At the same time, it also has excellent energy absorption and damping characteristics, effectively suppressing high-frequency vibration and plastic friction noise during rotation. Users can feel a uniform, linear and light resistance change when operating. At the same time, it not only optimizes the user experience, but also provides a higher product yield because elastic deformation has a strong tolerance compensation capability, low requirements for process precision, avoids dependence on precision molds. Attached Figure Description

[0015] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of a rotating shaft in the prior art; Figure 2 This is a schematic diagram of the silent rotating shaft structure for vehicle air vents shown in this utility model; Figure 3 This is a front view of the silent rotating shaft structure for vehicle air vents shown in this utility model; Figure 4 This is a schematic diagram of the contact element before elastic deformation as shown in this utility model. Detailed Implementation

[0016] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0017] Combination Figure 1 As shown, the original bushing 10 has only one shaft hole 10A inside. The size of the shaft hole 10A directly affects the assembly difficulty of the target rotating shaft 20, the rotational friction and wear problems in the later stage. However, there are some problems regardless of whether the shaft hole 10A and the target rotating shaft 20 adopt a transition fit, clearance fit or interference fit.

[0018] Based on the above, combined with Figures 2 to 4 As shown, this utility model proposes a silent rotating shaft structure for vehicle air vents, including a bushing structure 11, multiple connectors 12, and multiple contact members 13.

[0019] The bushing structure 11 is constructed as a ring structure, which is larger than the outer diameter of the target rotating shaft 20. The first end of the connector 12 is connected to the inner wall of the bushing structure 11, and the second end extends toward the surface of the target rotating shaft 20.

[0020] Furthermore, the contact 13 includes at least one connecting end and a contact end 131, the connecting end being connected to the second end of one or more connectors 12, and the contact end 131 extending toward the surface of the target shaft 20.

[0021] The contact element 13 is configured to be elastically connected to the connector 12, so that the contact end 131 can change the distance from the center of the bushing structure 11 under radial pressure. The inner circle diameter D1 of the contact ends 131 of the multiple contact elements 13 is smaller than the outer diameter D2 of the target rotating shaft 20.

[0022] Thus, when the target shaft 20 is inserted into the inside of the contact member 13, since the diameter of the inscribed circle of the contact end 131 of the contact member 13 is slightly smaller than the outer diameter D2 of the target shaft 20, the contact member 13 is displaced radially outward due to the pressure. The material elasticity of the contact member 13 and the connecting member 12 causes deformation, and due to the elastic deformation, the contact member 13 maintains a certain pressure on the target shaft.

[0023] Optionally, the diameter difference between D1 and D2 is less than 10% of D2.

[0024] As mentioned above, this structure does not require stringent process requirements for the inner diameter. In particular, the pivot structure of the air vent interior parts is usually less than 5mm, while existing technologies require an accuracy of less than 0.1mm. This structure can still meet the usage requirements with a process accuracy of 0.5mm, which greatly reduces the difficulty of the process.

[0025] Furthermore, at least one stress concentration area is provided between the contact end 131 of the connector 12 and the contact end 131 of the contact member 13. When the contact end 131 of the contact member 13 is compressed, the stress concentration area will deform preferentially.

[0026] In an optional embodiment, the structural member thickness / cross-sectional dimension in the stress concentration region is smaller than that in other regions.

[0027] It should be understood that stress concentration areas reduce the structural strength of the area by reducing the thickness / cross-sectional dimensions of its structural components, thus making it prone to deformation under stress. By setting multiple stress concentration areas on the structural path between the contact end 131 of the connector 12 and the contact 13, the requirements for elasticity, resilience and fatigue resistance can be met, and stress fatigue in a certain area can be avoided. This method has better wear resistance and fatigue life compared to elastic structures such as rubber pads.

[0028] In an optional embodiment, combined with Figure 3 As shown, the connector 12 is constructed as a rod-shaped structure extending radially from the inner wall of the bushing structure 11 toward the target rotating shaft 20.

[0029] Furthermore, the contact 13 is configured to include a first arcuate structure 132 and a second arcuate structure 133. The first end of the first arcuate structure 132 is connected to the end of the connector 12, and the second arcuate structure 133 is connected to the end of the first arcuate structure 132. The second arcuate structure 133 forms a contact end 131 with the contact area of ​​the target rotating shaft 20.

[0030] The center of the first arc-shaped structure 132 is the same as the center of the bushing structure 11, and the bending direction of the second arc-shaped structure 133 is opposite to the bending direction of the first arc-shaped structure 132.

[0031] Thus, the inner side of the bushing structure 11 is provided with four inwardly extending connectors 12, and the end of each connector 12 is connected to two contact members 13. Multiple contact members 13 are connected to each other to form a ring-like structure. Multiple inwardly extending second arc-shaped structures 133 are provided on the ring structure to form a contact area with the target rotating shaft 20. The first arc-shaped structure 132 forms a bridge-shaped structure, making it easy for the second arc-shaped structure 133 to generate radial displacement at the central position.

[0032] In the above embodiments, the bushing structure 11, the connector 12, and the contact 13 are integrally injection molded.

[0033] In an optional embodiment, the bushing structure 11, the connector 12, and the contact 13 are made of nylon.

[0034] In conjunction with the above embodiments, the inner side of the bushing of the shaft structure proposed in this utility model is provided with an elastic contact element. Through the elastic compensation of the elastic structure, it can maintain a continuous and relatively constant pressure on the shaft, that is, it has a continuous radial preload force, which can eliminate the abnormal noise caused by loosening in traditional clearance fits. At the same time, it also has excellent energy absorption and damping characteristics, effectively suppressing high-frequency vibration and plastic friction noise during rotation. Users can feel a uniform, linear and light resistance change when operating. At the same time, it not only optimizes the user experience, but also provides a higher product yield because elastic deformation has a strong tolerance compensation capability, low requirements for process precision, avoids dependence on precision molds.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A silent rotating shaft structure for a vehicle air vent, characterized in that, include: A bushing structure (11) is constructed as a ring structure, the ring structure being larger than the outer diameter of the target rotating shaft (20); Multiple connectors (12), the first end of which is connected to the inner wall of the bushing structure (11), and the second end extends toward the surface of the target shaft (20); Multiple contacts (13) include at least one connecting end and one contact end (131), the connecting end being connected to a second end of one or more of the connectors (12), and the contact end (131) extending toward the surface of the target shaft (20); The contact (13) is configured to be elastically connected to the connector (12), so that the contact end (131) can change the distance from the center of the bushing structure (11) under radial pressure, and the inner circle diameter D1 of the contact end (131) of the plurality of contact (13) is smaller than the outer diameter D2 of the target shaft (20).

2. The silent rotating shaft structure for a vehicle air vent according to claim 1, characterized in that, At least one stress concentration area is provided between the connector (12) and the contact end (131) of the contact member (13). When the contact end (131) of the contact member (13) is compressed, the stress concentration area will deform preferentially.

3. The silent rotating shaft structure for a vehicle air vent according to claim 2, characterized in that, The thickness / cross-sectional dimensions of the structural components in the stress concentration region are smaller than those in other regions.

4. The silent rotating shaft structure for a vehicle air vent according to claim 1, characterized in that, The connector (12) is constructed as a rod-shaped structure extending radially from the inner wall of the bushing structure (11) toward the target pivot (20).

5. The silent rotating shaft structure for a vehicle air vent according to claim 4, characterized in that, The contact (13) is configured to include a first arc-shaped structure (132) and a second arc-shaped structure (133), the first end of the first arc-shaped structure (132) is connected to the end of the connector (12), the second arc-shaped structure (133) is connected to the end of the first arc-shaped structure (132), and the second arc-shaped structure (133) forms a contact end (131) with the contact area of ​​the target rotating shaft (20).

6. The silent rotating shaft structure for a vehicle air vent according to claim 5, characterized in that, The center of the first arc structure (132) is the same as the center of the bushing structure (11), and the bending direction of the second arc structure (133) is opposite to the bending direction of the first arc structure (132).

7. The silent rotating shaft structure for a vehicle air vent according to claim 1, characterized in that, The bushing structure (11), connector (12) and contact (13) are integrally injection molded.

8. The silent rotating shaft structure for a vehicle air vent according to claim 1, characterized in that, The bushing structure (11), connector (12) and contact (13) are made of nylon.

9. The silent rotating shaft structure for a vehicle air vent according to claim 1, characterized in that, The diameter difference between D1 and D2 is less than 10% of D2.

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