Headrest mechanism capable of being electrically folded backwards

Abstract

The headrest mechanism comprises a headrest assembly, a lead screw transmission mechanism, a base, a rotating shaft and a fixing support, the lead screw transmission mechanism and the fixing support are both fixedly arranged on the base, the rotating shaft is rotationally connected to the fixing support, the headrest assembly is fixed to the rotating shaft, and the fixing support is fixed to the base. The lead screw transmission mechanism is connected with the rotating shaft through the connecting rod mechanism, the lead screw transmission mechanism is rotationally connected with the connecting rod mechanism, the connecting rod mechanism is fixedly connected with the rotating shaft, the connecting rod mechanism is further rotationally connected to the base, and when the lead screw transmission mechanism drives the connecting rod mechanism to move, the rotating shaft can be driven to rotate backwards. Therefore, the headrest assembly is driven to be folded backwards. Large-angle backward folding of the headrest assembly can be achieved, no matter when a driver needs to adjust the angle of the headrest in a specific driving scene or a backrest needs to be adjusted backwards, the headrest needs to be folded backwards by a large angle to achieve storage, the structure can provide enough folding range, and the use convenience of the headrest is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, in particular to a headrest mechanism which can be electrically folded backwards. Background Art

[0002] In modern automotive seat design, headrests are crucial components for ensuring head and neck safety and enhancing ride comfort. Optimizing their performance and functionality has long been a key research and development focus. Rearward-folding electric headrest mechanisms have garnered significant attention, as they offer flexible adjustment of the headrest's angle to suit diverse seating scenarios and meet diverse riding needs. However, traditional rearward-folding electric headrest mechanisms have numerous limitations in design and application, most notably the limited folding angle. In actual automotive seat use, users have diverse requirements for headrest folding angles. For example, during long drives, drivers may want to continuously adjust the rearward folding angle of the headrest to provide more comfortable neck support and alleviate driver fatigue. Alternatively, they may want to stow the headrest away from the seatback when the backrest is adjusted rearward, eliminating the need to manually remove it. However, due to limitations in the structural design and interoperability of various components, conventional rearward-folding electric headrest mechanisms cannot tilt the headrest backward to a wide angle for effective stowage. Manual removal is still required, a time-consuming and labor-intensive process. Summary of the Invention

[0003] In view of the above problems existing in the prior art, the present invention aims to provide a headrest mechanism that can be electrically folded backwards, so as to achieve large-angle backward folding of the headrest assembly.

[0004] In order to achieve the above-mentioned purpose, the present invention proposes a headrest mechanism that can be electrically folded backward, including a headrest assembly, a screw transmission mechanism and a base, and also including a rotating shaft, a fixed bracket and a connecting rod mechanism. The screw transmission mechanism and the fixed bracket are both fixed on the base, the rotating shaft is rotatably connected to the fixed bracket, the headrest assembly is fixed on the rotating shaft, and the screw transmission mechanism is connected to the rotating shaft through a connecting rod mechanism, wherein the screw transmission mechanism and the connecting rod mechanism are rotatably connected, and the connecting rod mechanism and the rotating shaft are fixedly connected, and the connecting rod mechanism is also rotatably connected to the base. When the screw transmission mechanism drives the connecting rod mechanism to move, it can drive the rotating shaft to rotate backward, thereby driving the headrest assembly to fold backward.

[0005] In the above solution, the screw drive mechanism comprises a motor, gearbox, and screw, which are assembled together. The screw is arranged vertically. The motor, through the gearbox, drives the screw axially, i.e., drives the screw up and down. This transmission method has low energy loss and can quickly respond to the motor's drive command, causing the screw to move up and down rapidly, thereby driving the headrest assembly to achieve a fast and smooth rearward flipping action, effectively improving the operating efficiency of the headrest mechanism.

[0006] In the above scheme, the connecting rod mechanism includes a first connecting rod, a second connecting rod, and a third connecting rod. The lower end of the first connecting rod, the lower end of the second connecting rod, and the upper end of the screw rod are rotatably connected together. The upper end of the first connecting rod is rotatably connected to the base. The upper end of the second connecting rod is rotatably connected to the lower end of the third connecting rod. The upper end of the third connecting rod is fixed to the rotating shaft. When the screw rod is driven to move upward, it can drive the first connecting rod, the second connecting rod, and the third connecting rod to rotate, thereby driving the rotating shaft to rotate, and then driving the headrest assembly to fold backward. The three-link combination design provides the headrest assembly with a larger folding angle range. When the screw rod moves upward, each connecting rod realizes a complex motion trajectory through the rotational connection, which can drive the rotating shaft to achieve a large rotation, so that the headrest assembly can be flipped backward to a more suitable position, meeting the diverse needs of different users for headrest angles in different usage scenarios.

[0007] In the above solution, there are two fixed brackets on the left and right, and the rotating shaft is rotatably connected between the two fixed brackets. The two fixed brackets on the left and right jointly support the rotating shaft, so that the force on the rotating shaft is more balanced during the rotation process.

[0008] In the above embodiment, the headrest assembly includes two headrest rods and a headrest fixed to the upper ends of the two headrest rods. The lower ends of the two headrest rods are respectively fixed to the rotating shaft via headrest rod fixing members. The headrest rod fixing members secure the lower ends of the headrest rods to the rotating shaft, forming an organic whole with the rotating shaft, ensuring structural stability and reliability.

[0009] The beneficial effects of the present invention are as follows: 1. Traditional electric headrest mechanisms are limited by their structure, etc., and the folding angle is often small, making it difficult to meet the diverse usage needs of users. The present invention can easily achieve a large-angle backward folding of the headrest assembly through the clever coordination of the screw transmission mechanism, the connecting rod mechanism and the rotating shaft. Whether the driver needs to adjust the headrest angle in a specific driving scenario, or when the backrest is adjusted backward, the headrest needs to be folded backward at a large angle for storage. This structure can provide a sufficient folding range, greatly enhancing the convenience of using the headrest (in actual application, the folding angle can be greater than 150°). 2. The fixed bracket provides stable support for the rotating shaft, ensuring that the rotating shaft will not shake or deflect during rotation, reducing the noise and vibration caused by friction and collision between transmission components. The screw transmission mechanism has a self-locking function. When the headrest assembly is adjusted to the required angle, it can remain stable and will not easily change position due to external forces, thereby improving the reliability and safety of the headrest mechanism.

[0010] 3. The structure is simple, occupies little space and is easy to arrange. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is an exploded schematic diagram of the present invention.

[0013] Figure 3 It is an enlarged schematic diagram of the connecting rod mechanism of the present invention.

[0014] Figure 4 is a schematic diagram showing the headrest in its initial position.

[0015] Figure 5 This is a diagram of the headrest folded to the middle position.

[0016] Figure 6 is a schematic diagram of the headrest folded to the rearmost position.

[0017] Figure 7 This is the schematic diagram of the folding headrest. DETAILED DESCRIPTION

[0018] like Figure 1 As shown in FIG. 7 , a headrest mechanism that can be electrically folded backward is mainly composed of a headrest assembly A, a screw transmission mechanism B, a base 1, a rotating shaft 2, a fixed bracket 3 and a connecting rod mechanism C.

[0019] The screw transmission mechanism B and the fixed bracket 3 are both fixed on the base 1, the rotating shaft 2 is rotatably connected to the fixed bracket 3, the headrest assembly A is fixed on the rotating shaft 2, and the screw transmission mechanism B is connected to the rotating shaft 2 through the connecting rod mechanism C, wherein the screw transmission mechanism B and the connecting rod mechanism C are rotatably connected, the connecting rod mechanism C is fixedly connected to the rotating shaft 2, and the connecting rod mechanism C is also rotatably connected to the base 1.

[0020] When the screw transmission mechanism B drives the connecting rod mechanism C to move, it can drive the rotating shaft 2 to rotate backward, thereby driving the headrest assembly A to fold backward.

[0021] Preferably, the screw drive mechanism B comprises a motor 4, a gearbox 5, and a screw 6, which are assembled together. The screw 6 is arranged vertically. The motor 4 drives the screw 6 axially through the gearbox 5, that is, drives the screw 6 up and down. This transmission method has low energy loss and can quickly respond to the drive command of the motor 5, causing the screw 6 to move up and down quickly, thereby driving the headrest assembly A to achieve a fast and smooth rearward tilting movement, effectively improving the operating efficiency of the headrest mechanism.

[0022] Preferably, the connecting rod mechanism C includes a first connecting rod 7, a second connecting rod 8 and a third connecting rod 9, the lower end of the first connecting rod 7, the lower end of the second connecting rod 8 and the upper end of the screw rod 6 are rotatably connected together, the upper end of the first connecting rod 7 is rotatably connected to the base 1, the upper end of the second connecting rod 8 is rotatably connected to the lower end of the third connecting rod 9, and the upper end of the third connecting rod 9 is fixed on the rotating shaft 2. When the screw rod 6 is driven by the motor 4 to move upward, it can drive the first connecting rod 7, the second connecting rod 8 and the third connecting rod 9 to rotate, thereby driving the rotating shaft 2 to rotate, and then driving the headrest assembly A to fold backward.

[0023] The three-link combination design provides the headrest assembly A with a larger flip angle range. When the screw rod 6 moves upward, each link realizes a complex motion trajectory through the rotation connection, which can drive the rotating shaft 2 to achieve a larger rotation, so that the headrest assembly A can be flipped backward to a more suitable position, meeting the diverse needs of different users for headrest angles in different usage scenarios.

[0024] Preferably, there are two fixed brackets 3 on the left and right, and the rotating shaft 2 is rotatably connected between the two fixed brackets 3. The two fixed brackets 3 on the left and right jointly support the rotating shaft 2, so that the rotating shaft 2 is subjected to more balanced force during the rotation process.

[0025] Preferably, the headrest assembly A includes two headrest rods 10 and a headrest 11 fixed to the upper ends of the two headrest rods 10. The lower ends of the two headrest rods 10 are respectively fixed to the rotating shaft 2 via headrest rod fixing members 12. The headrest rod fixing members 12 fix the lower ends of the headrest rods 10 to the rotating shaft 2, so that the entire headrest assembly A and the rotating shaft 2 form an organic whole, ensuring the stability and reliability of the structure.

Claims

1. A headrest mechanism capable of being electrically folded backward, comprising a headrest assembly (A), a screw drive mechanism (B) and a base (1), characterized in that: The invention also includes a rotating shaft (2), a fixed bracket (3) and a connecting rod mechanism (C), wherein the screw transmission mechanism (B) and the fixed bracket (3) are both fixedly arranged on the base (1), the rotating shaft (2) is rotatably connected to the fixed bracket (3), the headrest assembly (A) is fixed on the rotating shaft (2), the screw transmission mechanism (B) is connected to the rotating shaft (2) through the connecting rod mechanism (C), wherein the screw transmission mechanism (B) and the connecting rod mechanism (C) are rotatably connected, and the connecting rod mechanism (C) and the rotating shaft (2) are fixedly connected, and the connecting rod mechanism (C) is also rotatably connected to the base (1), and when the screw transmission mechanism (B) drives the connecting rod mechanism (C) to move, it can drive the rotating shaft (2) to rotate backward, thereby driving the headrest assembly (A) to fold backward.

2. The headrest mechanism capable of electric folding backward according to claim 1, characterized in that: The screw transmission mechanism (B) comprises a motor (4), a gear box (5) and a screw (6) assembled together, wherein the screw (6) is arranged vertically, and the motor (4) can drive the screw (6) to move axially through the gear box (5).

3. The headrest mechanism capable of electric folding backward according to claim 2, characterized in that: The connecting rod mechanism (C) includes a first connecting rod (7), a second connecting rod (8) and a third connecting rod (9). The lower end of the first connecting rod (7), the lower end of the second connecting rod (8) and the upper end of the screw rod (6) are rotatably connected together. The upper end of the first connecting rod (7) is rotatably connected to the base (1). The upper end of the second connecting rod (8) is rotatably connected to the lower end of the third connecting rod (9). The upper end of the third connecting rod (9) is fixed to the rotating shaft (2). When the screw rod (6) is driven to move upward, it can drive the first connecting rod (7), the second connecting rod (8) and the third connecting rod (9) to rotate, thereby driving the rotating shaft (2) to rotate, and then driving the headrest assembly (A) to fold backward.

4. The headrest mechanism capable of electric folding backward according to claim 1, characterized in that: There are two fixed brackets (3) on the left and right, and the rotating shaft (2) is rotatably connected between the two fixed brackets (3).

5. The headrest mechanism capable of electric folding backward according to claim 1, characterized in that: The headrest assembly (A) comprises two headrest rods (10) and a headrest (11) fixed to the upper ends of the two headrest rods (10); the lower ends of the two headrest rods (10) are respectively fixed to the rotating shaft (2) through headrest rod fixing members (12).

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