A lumbar support translation structure

Abstract

The utility model relates to the technical field of seat adjustment, specifically relates to a waist support translation structure, and the structure includes the waist support pedestal, installs the drive mechanism of waist support pedestal, transmission mechanism, translation screw rod and translation nut, the output end of drive mechanism is connected with translation screw rod drive through transmission mechanism, translation nut is screwed on translation screw rod and is used for fixed connection with the support pedestal of outside. The utility model discloses a waist support translation structure, and its translation process is stable and smooth, and the reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of seat adjustment technology, specifically to a lumbar support translation structure. Background Technology

[0002] Prolonged sitting puts a lot of pressure on the lumbar spine. To alleviate this pressure, modern chairs (especially office chairs and car seats) are usually equipped with lumbar supports. Adjustable lumbar supports can adapt the support position to different users' body shapes and sitting postures.

[0003] Existing adjustment methods include manual and electric. Manual adjustment is usually inconvenient, requiring the user to operate with their hand behind their back or stand up to adjust it. While electric adjustment is convenient, existing electric sliding mechanisms (usually used to adjust the lumbar support's height or forward / backward movement) have some problems: Poor stability: Many structures are prone to tilting, swaying or jamming when moved, if the force is uneven (such as the user's back pressure is biased to one side).

[0004] Insufficient driving force or excessive noise: To overcome back pressure, a large driving torque is required, which usually means a large motor (large size) or a gearbox with a high reduction ratio (which may be noisy).

[0005] Therefore, how to provide a compact and stable lumbar support translation structure is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a lumbar support translation structure, which has a stable and smooth translation process and high reliability.

[0007] This utility model is achieved through the following technical solution: A lumbar support translation structure includes a lumbar support base, a drive mechanism mounted on the lumbar support base, a transmission mechanism, a translation screw, and a translation nut. The output end of the drive mechanism is driven and connected to the translation screw through the transmission mechanism. The translation nut is screwed to the translation screw and used for fixed connection with an external support base.

[0008] The lumbar support base is also connected to a translation guide column parallel to the output direction of the drive mechanism, and the support base is slidably connected to the translation guide column.

[0009] The translation guide column consists of two columns, symmetrically arranged on both sides of the translation lead screw.

[0010] The driving mechanism is a motor.

[0011] The transmission mechanism includes a worm, a first double gear, a second double gear, a first gear, a first helical gear, and a second helical gear. The worm meshes with the large gear of the first double gear, the small gear of the first double gear meshes with the large gear of the second double gear, the small gear of the second double gear meshes with the first gear, the first gear and the first helical gear are coaxially rotatably connected, the first helical gear meshes with the second helical gear, and the second helical gear is coaxially rotatably connected with a translation screw.

[0012] It also includes a limit protection mechanism, which includes at least one limit switch disposed on the lumbar support base and a trigger part disposed on the support base or a component that moves synchronously with the support base; when the support base moves to the limit position, the trigger part can trigger the limit switch to cut off the power supply of the drive mechanism.

[0013] The beneficial effects of this utility model are: This utility model discloses a lumbar support translation structure, which includes a lumbar support base, a drive mechanism, a transmission mechanism, a translation screw, and a translation nut. The translation nut is connected to an external support structure, thereby achieving a stable and smooth seat adjustment and translation process with high reliability. Attached Figure Description

[0014] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the transmission mechanism.

[0017] Figure Labels Waist support base--101, translation guide column--102, drive mechanism--103, transmission mechanism--104, translation lead screw--105, translation nut--106, worm gear--107, first double gear--108, second double gear--109, first gear--110, first helical gear--111, second helical gear--112, support base--113, limit switch--114. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] like Figure 1 and Figure 2 As shown, this embodiment discloses a lumbar support translation structure, which includes a lumbar support base 101, a drive mechanism 103, a transmission mechanism 104, a translation screw 105, and a translation nut 106 mounted on the lumbar support base 101. The output end of the drive mechanism 103 is driven and connected to the translation screw 105 through the transmission mechanism 104. The translation nut 106 is screwed to the translation screw 105 and is used to fix it to an external support base 113.

[0022] In this embodiment, the lumbar support base 101 is the fixed base of the entire structure (e.g., it is mounted on the backrest frame of the seat). The drive mechanism 103 and the transmission mechanism 104 are also mounted on the lumbar support base 101. The translation screw 105 is driven to rotate by the transmission mechanism 104, but its axial position relative to the lumbar support base 101 is fixed. The translation nut 106 is screwed onto the screw and is fixedly connected to the movable part supporting the user's waist. When the translation screw 105 rotates, the translation nut 106 cannot rotate with it due to rotational constraints, and therefore can only perform linear translation along the axial direction of the translation screw 105. The translation of the translation nut 106 causes the support base 113, which is fixed to it, to translate together (e.g., move up and down), thereby realizing the adjustment of the lumbar support position. The screw and nut transmission is a high-precision and high-efficiency method of converting rotary motion to linear motion, with smooth transmission and easy to achieve precise position control.

[0023] As a preferred embodiment, the lumbar support base 101 is also connected to a translation guide column 102 that is parallel to the output direction of the drive mechanism 103 (i.e., parallel to the translation lead screw 105), and the support base 113 is slidably connected to the translation guide column 102.

[0024] The translation guide post 102 provides crucial motion constraints for the support base 113, and is fixed to the waist support base 101. The support base 113 is provided with corresponding guide holes or sliding sleeves that slide in conjunction with the translation guide post 102. The guide post provides a clear motion trajectory for the translation of the support base 113, ensuring that it can only perform linear translation.

[0025] In addition, the main pressure on the user's back (especially the lateral force) is borne by the translation guide post 102 and the sliding sleeve, rather than by the translation screw 105 and the translation nut 106. This allows the screw and nut to focus on transmitting thrust, greatly improving transmission efficiency and service life, and preventing wobbling and jamming of the support base 113.

[0026] As a preferred embodiment, there are two translation guide posts 102, symmetrically arranged on both sides of the translation lead screw 105. A double guide post structure is adopted, and they are symmetrically arranged on both sides of the translation lead screw 105 that provides thrust. The support base 113 is slidably connected to these two guide posts via two sliding sleeves.

[0027] Compared to a single guide post, the dual translational guide post 102 structure offers superior rigidity and stability. When the pressure on the user's back is uneven, i.e., when an eccentric load is applied, the dual guide posts effectively resist the resulting torsional moment, preventing the support base 113 from tilting, skewing, or wobbling, ensuring smooth and stable movement throughout its entire stroke.

[0028] As a preferred option, the drive mechanism 103 is a motor, that is, it uses electrical energy as a power source, which realizes the automation of lumbar support adjustment. Users do not need to operate manually, but can easily adjust it by simply pressing a button, which greatly improves the convenience of the product and the user experience.

[0029] As a preferred embodiment, the transmission mechanism 104 includes a worm 107, a first double gear 108, a second double gear 109, a first gear 110, a first helical gear 111, and a second helical gear 112. The worm 107 meshes with the large gear of the first double gear 108, the small gear of the first double gear 108 meshes with the large gear of the second double gear 109, the small gear of the second double gear 109 meshes with the first gear 110, the first gear 110 is coaxially rotatably connected to the first helical gear 111, the first helical gear 111 meshes with the second helical gear 112, and the second helical gear 112 is coaxially rotatably connected to the translation screw 105.

[0030] The aforementioned transmission mechanism 104 achieves multi-stage reduction and reversing transmission chains, realizing a huge overall transmission ratio through worm gear 107 and two-stage double gear transmission. This converts the high speed and low torque of the motor into the low speed and extremely high torque required by the translation screw 105. This allows even a micro motor to generate sufficient thrust to overcome the strong pressure on the user's back and achieve smooth adjustment.

[0031] Furthermore, one of the key aspects of this transmission chain lies in the first-stage worm gear 107, which possesses a natural reverse self-locking characteristic. This means that when the motor stops supplying power, the reverse pressure (pressure on the user's back) from the translation screw 105 and the support base 113 cannot drive the worm gear 107 in the reverse direction via the transmission chain, and the entire mechanism is firmly locked. This ensures that the lumbar support can remain stably suspended after being adjusted to any position, without sliding down or retracting on its own, greatly improving safety and reliability, and eliminating the need for an additional braking device.

[0032] The engagement of the first helical gear 111 and the second helical gear 112 enables the reversal of power, allowing the axis of the motor (and worm gear 107) to be arranged perpendicular to the axis of the translation screw 105. For example, the motor can be mounted horizontally while the screw is mounted vertically, which allows the overall thickness (or width) of the entire translation structure to be very small, i.e., compact and easy to integrate into a thin seat back.

[0033] Compared to ordinary spur gear drives, worm gear 107 drives and helical gear drives have a smoother meshing process, less impact, and therefore lower operating noise.

[0034] As a preferred embodiment, to ensure safety, a limit protection mechanism is also included. The limit protection mechanism includes at least one limit switch disposed on the lumbar support base 101, and a trigger part disposed on the support base 113 or a component that moves synchronously with the support base 113. When the support base 113 moves to the limit position, the trigger part can trigger the limit switch to cut off the power supply to the drive mechanism 103.

[0035] Limit switches (such as micro switches) are installed at both ends of the translation path of the lumbar support base 101, and a trigger is provided on the support base 113. When the support base 113 moves to the end of its stroke, the trigger will physically collide with and press down the limit switch, and the limit switch will immediately cut off the circuit supplying the drive mechanism 103. The power supply is cut off before the support base 113 strikes the mechanical end of the lead screw or guide post, avoiding severe mechanical impact and damage. Furthermore, it prevents motor stalling due to reaching mechanical limits, which would generate extremely high current and easily burn out the motor coils. Additionally, this mechanism effectively prevents motor overload and burnout, avoids applying excessive impact loads to the transmission mechanism 104 (especially gears) at the end of the stroke, extends the gearbox's lifespan, and provides a simple and reliable stroke end signal for the control system.

[0036] In summary, the lumbar support translation structure provided in this embodiment has the following effects: High stability: The symmetrical layout of the double guide pillars effectively resists eccentric loads, ensuring smooth translation without wobbling.

[0037] High torque and self-locking: The worm gear 107 and multi-stage gear transmission provide high torque and reliable power-off self-locking function, ensuring stable support and preventing slippage.

[0038] Compact structure: The helical gear reversal design optimizes the spatial layout.

[0039] High reliability: The limit switch protects the motor and transmission system, preventing overload damage and has a long service life.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A lumbar support translation structure, characterized in that, It includes a lumbar support base, a drive mechanism mounted on the lumbar support base, a transmission mechanism, a translation screw, and a translation nut. The output end of the drive mechanism is driven and connected to the translation screw through the transmission mechanism. The translation nut is screwed to the translation screw and used for fixed connection with an external support base.

2. The lumbar support translation structure according to claim 1, characterized in that, The lumbar support base is also connected to a translation guide column parallel to the output direction of the drive mechanism, and the support base is slidably connected to the translation guide column.

3. The lumbar support translation structure according to claim 2, characterized in that, The number of translation guide columns is two, which are symmetrically arranged on both sides of the translation lead screw.

4. The lumbar support translation structure according to claim 1, characterized in that, The drive mechanism is a motor.

5. The lumbar support translation structure according to claim 1, characterized in that, The transmission mechanism includes a worm, a first double gear, a second double gear, a first gear, a first helical gear, and a second helical gear. The worm meshes with the large gear of the first double gear, the small gear of the first double gear meshes with the large gear of the second double gear, the small gear of the second double gear meshes with the first gear, the first gear and the first helical gear are coaxially rotatably connected, the first helical gear meshes with the second helical gear, and the second helical gear is coaxially rotatably connected with a translation screw.

6. The lumbar support translation structure according to claim 1, characterized in that, It also includes a limit protection mechanism, which includes at least one limit switch disposed on the lumbar support base and a trigger part disposed on the support base or a component that moves synchronously with the support base; When the support base moves to its limit position, the triggering part can trigger the limit switch to cut off the power supply to the drive mechanism.

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