A kind of noise reduction automobile sun visor frame pull rod mechanism

Abstract

The present invention is a noise-reducing automobile sun visor frame pull rod mechanism, comprising an aluminum tube, a sun visor frame with a hook shaft fixedly connected to the aluminum tube, and an L-shaped support shaft with one end sleeved in the aluminum tube and the other end installed in the automobile sun visor support, characterized in that: the support shaft connector provided on the support shaft side of the sun visor frame has a gap notch along the axial direction of the support shaft, and the support shaft connector is divided into an upper part and a lower part respectively fixedly connected to the sun visor frame, the minimum inner diameter of the support shaft connector and the outer diameter of the support shaft are interference fit, and the hole walls on both sides of the gap notch apply a clamping force to the support shaft, so as to achieve the purpose of reducing noise of the automobile sun visor. The present invention can give the sun visor a uniform and stable pull rod force and rotation force, reduce the abnormal noise generated during the pulling process of the automobile sun visor and the automatic reset of the automobile roof, and effectively improve the riding comfort experience of passengers in the car.

Description

Technical Field

[0001] The invention relates to an automobile sun visor, and in particular discloses a noise-reducing automobile sun visor frame pull rod mechanism. Background Art

[0002] With the rapid development of the automobile industry, the continuous increase in the number of cars owned at home and abroad, and the comprehensive development of major automobile brands, there are more and more product types to choose from on the market, which has prompted vehicle manufacturers to improve the competitiveness of their products from more angles, among which interior quietness is an extremely important point.

[0003] As an indispensable part of the car interior, the car sun visor has increasingly stringent noise control requirements. At present, the sun visor frame and aluminum tube are mostly fixed by clamping or riveting. The support shaft is inserted into the aluminum tube through the support shaft hole on the frame and clamped with the pre-set retaining spring sub-assembly. The support shaft needs to slide along the support shaft axis in the aluminum tube, so the support shaft hole diameter needs to be larger than the support shaft diameter. Therefore, when the sun visor is pulled or flipped, the support shaft and the support shaft hole on the frame rub against each other and make abnormal noises.

[0004] Traditional sun visors will inevitably produce slight creaking and knocking sounds when they automatically return to the car roof. This discomfort is particularly evident in mid-to-high-end luxury models that require a quiet interior space. So how to reduce the noise made by the car sun visor when it rotates back to its original position, so that it is more in line with the positioning of the car model and provides customers with a better user experience has become the focus of research. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects existing in the traditional design and provide a noise-reducing automobile sun visor frame pull rod mechanism, which reduces or basically eliminates the noise generated when the automobile sun visor is pulled and automatically returns to the automobile roof by changing the matching mode of the rotating shaft and the sun visor frame hole. At the same time, the mechanism of the present invention fully considers the product manufacturing cost factors, has a simpler structure, is easy to assemble, and has a stable structure, strong reliability and adaptability.

[0006] The present invention is a noise-reducing automobile sun visor frame pull rod mechanism, comprising an aluminum tube, a sun visor frame with a hook shaft fixedly connected to the aluminum tube, and an L-shaped support shaft with one end sleeved in the aluminum tube and the other end installed in the automobile sun visor support. The aluminum tube and the sun visor frame rotate around the support shaft, and the support shaft slides axially along the aluminum tube. It is characterized in that: a retaining spring subassembly matching its shape and inner diameter is provided in the aluminum tube, the connection between the sun visor frame and the aluminum tube is a U-shaped opening, one end of which is the hook shaft side, and the other end is the support shaft side, the shapes and sizes of the two ends are respectively matched with the shape and inner diameter of the connection at the aluminum tube, and are clamped and fixed to the aluminum tube, and protrusions are respectively provided at the clamping positions to increase friction and clamping strength. The retaining spring sub-assembly is provided with a semi-through hole that matches the size and shape of the end of the support shaft. After the support shaft connector provided on the support shaft side of the sun visor frame extends into the aluminum tube, the end of the support shaft is inserted into the semi-through hole of the retaining spring sub-assembly and is kept in the semi-through hole during rotation to ensure the position stability of the support shaft when the sun visor frame and the aluminum tube rotate. The support shaft connector provided on the support shaft side of the sun visor frame is provided with a gap notch along the axial direction of the support shaft, and the support shaft connector is divided into an upper part and a lower part that are respectively fixedly connected to the sun visor frame. The minimum inner diameter of the support shaft connector is interference fit with the outer diameter of the support shaft, and a clamping force is applied to the support shaft by the hole walls on both sides of the gap notch.

[0007] The end of the support shaft is a step-type clamping design. After the clamp spring subassembly is inserted, the two are automatically locked with each other. During the process of the sun visor automatically returning to the car roof, the support shaft is always kept in close contact with the sun visor frame through the clamping force of the support shaft connector. According to the use requirements, the clamping force of the support shaft can be controlled by changing the minimum inner diameter size of the support shaft connector and the size of the gap gap to ensure a comfortable feel when the aluminum tube and the sun visor frame rotate around the support shaft.

[0008] The aluminum tube provides a stable axial sliding channel for the support shaft. When the support shaft drives the retaining spring sub-assembly to slide in the aluminum tube, the support shaft connector always engages with the support shaft. The purpose is to provide a stable direction for the support shaft, avoiding uneven pull rod force caused by changes in force due to slight changes in the angle between the support shaft and the sun visor frame and the aluminum tube caused by the active gap. At the same time, when the support shaft is pulled, the support shaft connector provides a resistance in a corresponding direction, so that the pull rod force is moderate, closer to the median, and the feel is uniform.

[0009] The support shaft connecting piece on the sun visor frame is a reducer design with one end larger than the other end. The terminal end of the notch at the connection with the aluminum tube is the large end, which is clearance-fitted with the support shaft to avoid rotation difficulties caused by the complete fit between the sun visor frame and the support shaft. The starting end of the notch is an interference fit with the support shaft, so as to make the sun visor frame fit with the support shaft and eliminate the noise caused by the collision between the support shaft and the sun visor frame when the sun visor rotates.

[0010] The positive tolerance of the support shaft is controlled to be (+0.1 / 0), the negative tolerance of the starting end of the notch is controlled to be (0 / -0.1), and the interference fit is controlled within the range of 0~0.2mm, so that the clamping force applied to the support shaft by the sun visor frame through the support shaft connector is controlled within a reasonable range, ensuring that the flipping force of the support shaft is moderate.

[0011] The gap size of the support shaft connecting piece is controlled to be within the range of ±0.1mm of the diameter of the support shaft, and needs to be adjusted according to the size of the flipping force. If the size is too small, the clamping force will increase accordingly, thereby hindering the flexibility of the support shaft rotation. If the size is too large, the lateral clamping force is insufficient, which will cause the support shaft to shake left and right and produce noise.

[0012] The beneficial effects of the present invention are as follows: the present invention arranges a support shaft connector with a gap notch on the sun visor frame, and utilizes the notch-type design of the variable diameter support shaft connector to make the support shaft and the sun visor frame fit more closely, solving the noise problem caused by the active gap between the sun visor frame and the support shaft during the automatic return or pulling of the sun visor in the traditional design of the automobile sun visor, providing a uniform and comfortable flipping force and pulling rod force for the use of the sun visor, and at the same time fully considering the manufacturing cost factor, the structure is simpler, the assembly is simple, and the overall structure is stable, reliable and adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the exploded structure of the sun visor frame pull rod mechanism of the present invention.

[0014] Figure 2 It is a front view of the structure of the sun visor frame pull rod mechanism after assembly.

[0015] Figure 3 yes Figure 2 Top view of the .

[0016] Figure 4 yes Figure 2 Schematic diagram of the AA-direction cross-sectional structure of the mating parts of the sun visor frame pull rod mechanism and the support shaft sub-assembly.

[0017] Figure 5 yes Figure 3Schematic diagram of the enlarged structure of the partial section along the BB line at the middle support shaft connection.

[0018] Wherein: 1. Aluminum tube; 2. Support shaft; 3. Sun visor frame; 4. Retaining spring sub-assembly; 5. Support shaft connector; 6. Hook shaft; 51. Gap notch; 52; Starting end of notch; 53. End of notch. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] according to Figures 1 to 5 A noise-reducing automobile sun visor frame pull rod mechanism comprises an aluminum tube 1, a sun visor frame 3 with a hook shaft 6 fixedly connected to the aluminum tube 1, and an L-shaped support shaft 2 with one end sleeved in the aluminum tube 1 and the other end installed in the automobile sun visor support. The aluminum tube 1 and the sun visor frame 3 rotate around the support shaft 2, and the support shaft 2 slides axially along the aluminum tube 1. It is characterized in that: a retaining spring subassembly 4 matching its shape and inner diameter is provided in the aluminum tube 1, the connection between the sun visor frame 3 and the aluminum tube 1 is a U-shaped opening, one end of which is the hook shaft side, and the other end is the support shaft side. The shape and size of the two ends are respectively matched with the shape and inner diameter of the connection of the aluminum tube, and are clamped and fixed with the aluminum tube 1, and protrusions are respectively provided at the clamping parts to increase friction and clamping firmness. The retaining spring subassembly 4 is provided with a semi-through hole that matches the size and shape of the end of the support shaft 2. After the support shaft 2 extends from the support shaft connector 5 provided on the support shaft side of the sun visor frame 3 into the aluminum tube 1, the end of the support shaft 2 is inserted into the semi-through hole of the retaining spring subassembly 4 and is kept in the semi-through hole during rotation to ensure the position stability of the support shaft 2 when the sun visor frame 3 and the aluminum tube 1 rotate. The support shaft connector 5 provided on the support shaft side of the sun visor frame 3 is provided with a gap notch 51 along the axial direction of the support shaft 2, dividing the support shaft connector 5 into upper and lower parts that are respectively fixedly connected to the sun visor frame 3. The minimum inner diameter of the support shaft connector 5 is interference fit with the outer diameter of the support shaft 2, and the hole walls on both sides of the gap notch 51 apply a clamping force to the support shaft 2.

[0021] The end of the support shaft 2 is designed as a step-type clamping connection. After the clamp spring subassembly 4 is inserted, the two are automatically locked with each other. The support shaft 2 is always kept in close contact with the sun visor frame 3 through the clamping force of the support shaft connector 5 during the sun visor automatically returns to the car roof. According to the use requirements, the clamping force on the support shaft 2 can be controlled by changing the minimum inner diameter of the support shaft connector 5 and the size of the gap notch 51 to ensure a comfortable feel when the aluminum tube 1 and the sun visor frame 3 rotate around the support shaft 2.

[0022] The aluminum tube 1 provides a stable axial sliding channel for the support shaft 2. When the support shaft 2 drives the retaining spring sub-assembly 4 to slide in the aluminum tube 1, the support shaft connector 5 always engages with the support shaft 2. The purpose is to provide a stable direction for the support shaft 2, avoiding uneven pull rod force caused by force changes caused by slight changes in the angle between the support shaft 2 and the sun visor frame 3 and the aluminum tube 1 due to the active gap. At the same time, when pulling the support shaft 2, the support shaft connector 5 provides a resistance in a corresponding direction, so that the pull rod force is moderate, closer to the median, and the feel is uniform.

[0023] The support shaft connector 5 on the sun visor frame 3 is a variable diameter design with one end larger than the other end. The notch termination end at the connection with the aluminum tube 1 is the large end, and is in a clearance fit with the support shaft 2 to avoid the difficulty of rotation caused by the complete fit between the sun visor frame 3 and the support shaft 2. The starting end 52 of the notch is an interference fit with the support shaft 2, the purpose of which is to make the sun visor frame 3 fit with the support shaft 2 and eliminate the noise caused by the collision between the support shaft 2 and the sun visor frame 3 when the sun visor rotates. When the sun visor is stationary at any position or automatically returns to the roof of the car, the support shaft 2 always keeps fit with the starting end 52 of the notch under the action of the gap notch 51 of the support shaft connector 5, providing a uniform bite force for the support shaft 2, so that the return speed of the sun visor is uniform and not stuck, and at the same time avoids the collision and abnormal rotation noise caused by the clearance fit design between the traditional sun visor frame and the support shaft, and achieves the required noise reduction effect.

[0024] The positive tolerance of the support shaft 2 is controlled to be (+0.1 / 0), the negative tolerance of the notch starting end 52 is controlled to be (0 / -0.1), and the interference fit is controlled within the range of 0~0.2mm, so that the clamping force applied by the sun visor frame 3 to the support shaft 2 through the support shaft connector 5 is controlled within a reasonable range, ensuring that the flipping force of the support shaft 2 is moderate.

[0025] The size of the gap notch of the support shaft connecting piece 5 is within the range of ±0.1mm of the diameter of the support shaft, and needs to be adjusted according to the size of the flipping force. If the size is too small, the clamping force will increase accordingly, thereby hindering the flexibility of the rotation of the support shaft 2. If the size is too large, the lateral clamping force is insufficient, which will cause the support shaft 2 to shake left and right and produce noise.

Claims

1. A noise-reducing automobile sun visor frame pull rod mechanism, comprising an aluminum tube, a sun visor frame with a hook shaft fixedly connected to the aluminum tube, and an L-shaped support shaft with one end sleeved in the aluminum tube and the other end installed in the automobile sun visor support, the aluminum tube and the sun visor frame rotate around the support shaft, and the support shaft slides along the axial direction of the aluminum tube, characterized in that: The aluminum tube is provided with a retaining spring subassembly that matches its shape and inner diameter. The connection between the sun visor frame and the aluminum tube is a U-shaped opening, one end of which is the hook shaft side, and the other end is the support shaft side. The shapes and sizes of the two ends are respectively matched with the shape and inner diameter of the connection of the aluminum tube, and are clamped and fixed with the aluminum tube, and protrusions for increasing friction and clamping firmness are respectively provided at the clamping position. The retaining spring subassembly is provided with a semi-through hole that matches the size and shape of the end of the support shaft. The support shaft is supported from the sun visor frame After the support shaft connecting piece arranged on the seat shaft side extends into the aluminum tube, the end portion is inserted into the semi-through hole of the retaining spring sub-assembly, and the end portion of the support shaft is always kept in the semi-through hole during rotation. The support shaft connecting piece arranged on the support shaft side of the sun visor frame is provided with a gap notch along the axial direction of the support shaft, and the support shaft connecting piece is divided into an upper and a lower part respectively fixedly connected to the sun visor frame. The minimum inner diameter of the support shaft connecting piece and the outer diameter of the support shaft are interference fit, and the hole walls on both sides of the gap notch apply a clamping force to the support shaft.

2. The noise reduction automobile sun visor frame pull rod mechanism according to claim 1, characterized in that: The support shaft connecting piece on the sun visor frame is a variable diameter design with one end larger than the other end. The termination end of the gap notch where it is connected to the aluminum tube is the larger end, which is a clearance fit with the support shaft, and the starting end of the gap notch is an interference fit with the support shaft.

3. The noise reduction automobile sun visor frame pull rod mechanism according to claim 1, characterized in that: The end of the support shaft is designed as a step-type clamping connection, and the two are automatically locked with each other after the clamping spring sub-assembly is inserted.

4. The noise reduction automobile sun visor frame pull rod mechanism according to claim 1, characterized in that: The aluminum tube provides a stable axial sliding channel for the support shaft. When the support shaft drives the retaining spring subassembly to slide in the aluminum tube, the support shaft connector always engages with the support shaft.

5. The noise reduction automobile sun visor frame pull rod mechanism according to claim 2, characterized in that: The positive tolerance of the support shaft is controlled to +0.1 / 0, the negative tolerance of the starting end of the notch is controlled to 0 / -0.1, the interference fit is controlled within the range of 0~0.2mm, and the gap size of the support shaft connector is within the range of ±0.1mm of the shaft diameter.

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