Backrest adjustment device for a motorized seat of a vehicle

Abstract

The utility model belongs to the technical field of automobile seat, and disclose a back adjusting device for automobile electric seat, including seat body, backrest and headrest, still include drive assembly, adjusting assembly and limit component, drive assembly includes drive motor, differential and rotary lever, drive motor output passes through differential and is connected in rotary lever one end, rotary lever outer wall is connected with seat body inner wall rotation, adjusting assembly includes adjusting plate and pressure sensor. The utility model has realized through drive assembly can effectively compensate gear meshing gap, avoids angle deviation, realizes stable adjusting speed, ensures backrest angle adjusting precision, adapts to the sitting posture habit of different drivers and passengers, avoids drive motor overload damage, protects the driver and passenger from impact at the same time, and limit component can better carry out maintenance dismounting through the cooperation of the limiting ring with a plurality of limiting holes and the limiting rod with a return spring.

Description

Technical Field

[0001] This utility model belongs to the field of automotive seat technology, specifically a backrest adjustment device for an electric automotive seat. Background Technology

[0002] With the rapid development of the automotive industry, consumers are demanding higher and higher levels of comfort in their vehicles. Taking electric car seats as an example, the electric adjustment of the seats makes it easier for drivers and passengers to accurately and quickly adjust the seats to the most comfortable and familiar angle, eliminating the inconvenience of manually adjusting them. However, the backrest adjustment device is required when using electric car seats.

[0003] Existing backrest adjustment devices typically adjust the backrest of car electric seats by driving a motor. However, in actual use, they lack a differential mechanism to compensate for gear meshing clearance. When adjusting the backrest forward / backward, the gear clearance can easily cause large angle deviations, making it difficult to accurately match the comfort angle needs of the driver and passengers. Utility Model Content

[0004] To address the problems mentioned in the background section, this utility model provides a backrest adjustment device for an electric car seat.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backrest adjustment device for an electric car seat, comprising a seat body, a backrest, and a headrest, and further comprising a drive assembly, an adjustment assembly, and a limiting assembly. The drive assembly includes a drive motor, a differential, and a rotating rod. The output end of the drive motor is connected to one end of the rotating rod through the differential. The outer wall of the rotating rod is rotatably connected to the inner wall of the seat body. The adjustment assembly includes an adjustment plate and a pressure sensor. The adjustment plate is detachably connected to one side of the backrest, and the pressure sensor is embedded in the inner wall of the seat body. The limiting assembly includes a limiting ring, a fixing plate, an adjustment box, a limiting rod, a blocking plate, a connecting plate, and a fixing bolt. The inner wall of the limiting ring is fixed to the outer wall of the rotating rod. The limiting rod is slidably connected to the inner wall of the adjustment box. The blocking plate is fixed to the outer wall of the limiting rod. One end of the connecting plate is fixed to one end of the limiting rod, and the inner wall of the connecting plate is threadedly connected to the outer wall of the fixing bolt.

[0006] Preferably, the differential is a planetary differential with a gear ratio of 1:30. The input end of the differential is connected to the output end of the drive motor via a coupling, and the output end of the differential is connected to one end of the rotating rod via a spline. The planetary differential has a compact structure, effectively compensates for gear meshing backlash, avoids angular deviations caused by backlash during backrest adjustment, and ensures adjustment accuracy.

[0007] Preferably, the pressure sensor is a thin-film pressure sensor, two in total, each disposed on the inner wall of the seat body, and connected to the overload protection module of the drive motor via wires. Thin-film pressure sensors are small in size and thin in thickness, and their embedding in the inner wall of the seat body does not affect the seat's appearance or seating comfort.

[0008] Preferably, the limiting ring has several limiting holes on its outer periphery, and one end of the limiting rod is inserted into the inner wall of the limiting hole. The several limiting holes can correspond to different adjustment angles of the backrest, such as 30° forward tilt, 110° backward tilt, and multiple positioning angles in the middle, to meet the diverse sitting posture needs of drivers and passengers.

[0009] Preferably, a return spring is fixedly installed between one side of the baffle plate and the inner wall of the regulating box. The return spring can provide automatic reset power when the limit is released, eliminating the need for manual operation of the limit rod. The limit can be released simply by loosening the fixing bolt, greatly simplifying the maintenance and disassembly steps.

[0010] Preferably, the adjustment plate is an arc-shaped polyurethane board covered with breathable mesh fabric, and is detachably connected to the support frame of the backrest via buckles. The arc-shaped polyurethane board conforms to the curve of the human back, which can distribute back pressure and reduce local pressure during long-term sitting.

[0011] Preferably, the rotating rod is made of a steel shaft, with its outer wall rotatably connected to the inner wall of the seat body, and the outer wall of the rotating rod is connected to the inner wall of the adjustment plate. The steel shaft has high strength and good toughness, can withstand the torque and pressure during the backrest adjustment process, is not easily deformed or broken, and ensures stable power transmission.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves stable adjustment speed by using a planetary differential in the drive component and connecting the rotating rod through a spline, which can effectively compensate for gear meshing clearance, avoid angle deviation, and adapt to different sitting posture habits of drivers and passengers. Two pressure sensors detect back pressure in real time. When the lumbar region is under excessive pressure, the drive motor can be triggered to fine-tune the backrest, so that the pressure is evenly distributed and relieve local fatigue. When a sudden increase in pressure exceeding 500N is detected, the motor is immediately triggered to stop, avoiding overload damage to the drive motor and protecting the driver and passengers from impact. The limiting component, through the cooperation of a limiting ring with several limiting holes and a limiting rod with a return spring, can accurately limit the forward and backward tilting of the backrest. When limiting, after the limiting rod is inserted into the limiting hole, the connecting plate is locked by the fixing bolt to ensure that the limiting is firm and does not loosen. When releasing the limiting, only the bolt needs to be loosened in the opposite direction, and the return spring can drive the limiting rod to automatically return, thereby enabling better maintenance and disassembly. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0014] Figure 2 This is a side view of the present invention.

[0015] Figure 3 This is a cross-sectional view of the present invention.

[0016] Figure 4 This is a schematic diagram of the adjustment plate of this utility model.

[0017] Figure 5 This is a schematic diagram of the limiting ring of this utility model;

[0018] Figure 6 This is a schematic diagram of the limiting rod of this utility model.

[0019] In the diagram: 1. Seat body; 2. Backrest; 3. Headrest; 4. Drive motor; 5. Differential; 6. Rotating rod; 7. Adjusting plate; 8. Pressure sensor; 9. Limit ring; 10. Fixing plate; 11. Adjustment box; 12. Limiting rod; 13. Blocking plate; 14. Connecting plate; 15. Fixing bolt. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] like Figures 1 to 6 As shown, this utility model provides a backrest adjustment device for an electric car seat, including a seat body 1, a backrest 2 and a headrest 3, and also includes a drive assembly, an adjustment assembly and a limiting assembly. The drive assembly includes a drive motor 4, a differential 5 and a rotating rod 6. The output end of the drive motor 4 is connected to one end of the rotating rod 6 through the differential 5. The outer wall of the rotating rod 6 is rotatably connected to the inner wall of the seat body 1. The adjustment assembly includes an adjustment plate 7 and a pressure sensor 8. The adjustment plate 7 is detachably connected to one side of the backrest 2. The pressure sensor 8 is embedded in the inner wall of the seat body 1. The limiting assembly includes a limiting ring 9, a fixing plate 10, an adjustment box 11, a limiting rod 12, a blocking plate 13, a connecting plate 14 and a fixing bolt 15. The inner wall of the limiting ring 9 is fixed to the outer wall of the rotating rod 6. The limiting rod 12 is slidably connected to the inner wall of the adjustment box 11. The blocking plate 13 is fixed to the outer wall of the limiting rod 12. One end of the connecting plate 14 is fixed to one end of the limiting rod 12. The inner wall of the connecting plate 14 is threadedly connected to the outer wall of the fixing bolt 15.

[0023] Differential 5 is a planetary differential with a transmission ratio of 1:30. The input end of differential 5 is connected to the output end of drive motor 4 through a coupling, and the output end of differential 5 is connected to one end of rotating rod 6 through a spline.

[0024] Pressure sensor 8 is a thin-film pressure sensor, there are two in total, which are respectively installed on the inner wall of seat body 1 and connected to the overload protection module of drive motor 4 through wires;

[0025] The outer circumference of the limiting ring 9 is provided with several limiting holes. One end of the limiting rod 12 is inserted into the inner wall of the limiting hole. The rotating rod 6 is made of steel shaft and its outer wall is rotatably connected to the inner wall of the seat body 1. The outer wall of the rotating rod 6 is connected to the inner wall of the adjusting plate 7.

[0026] Example 2

[0027] Based on Example 1, a reset spring is fixedly installed between one side of the baffle plate 13 and the inner wall of the adjustment box 11. The adjustment plate 7 is an arc-shaped polyurethane plate with a breathable mesh covering its surface. It is detachably connected to the support frame of the backrest 2 by a buckle.

[0028] A reset spring is added between the baffle plate 13 and the inner wall of the regulating box 11. When it is necessary to release the limit, after loosening the fixing bolt 15 in the reverse direction, the reset spring releases the pre-compression force, pushes the baffle plate 13 to slide along the inner wall of the regulating box 11, and then drives the limit rod 12 to automatically disengage from the limit hole of the limit ring 9. There is no need to manually pull the limit rod 12, realizing the quick release of the limit state and simplifying the maintenance and disassembly operation process. When locking the limit, during the process of pushing the connecting plate 14 to drive the limit rod 12 to insert into the limit hole, the baffle plate 13 simultaneously compresses the reset spring, so that the spring stores the force, providing a power basis for the automatic reset of the limit release in the future.

[0029] The adjustment plate 7 is made of arc-shaped polyurethane board covered with breathable mesh fabric. The arc-shaped structure can closely conform to the curve of the human back, distributing back pressure and reducing local pressure. The polyurethane material has good elasticity and support, and can adaptively adjust according to the body shape of the driver and passenger, improving the comfort of long-term riding. The breathable mesh fabric on the surface can enhance air circulation and avoid the stuffiness caused by the back touching the adjustment plate 7. At the same time, the flexible material of the mesh fabric further enhances the tactile feel. With the snap-on detachable connection, the adjustment plate 7 can be quickly replaced according to the needs of different users' comfort preferences or component maintenance needs.

[0030] Before construction, the specific specifications of the core components must be clearly defined to ensure performance compatibility.

[0031] The backrest 2 hinged ear plate of the seat body 1 is made of Q235 steel plate by stamping.

[0032] Drive motor 4 is a 12V DC permanent magnet motor;

[0033] The planetary differential model 5 is PL20;

[0034] Rust prevention treatment for metal parts: The steel parts such as rotating rod 6, limit ring 9, and limit rod 12 are galvanized. The regulating box 11 and fixing plate 10 are made of cold-rolled steel plate and then sprayed with epoxy resin anti-rust paint dry film.

[0035] The surface of the adjustment plate 7 is made of breathable polyester mesh with a mesh size of 1mm×1mm. It is pre-attached with hot melt adhesive with a melting point of 120℃, and a 5mm margin is left at the edge for subsequent fastening.

[0036] The pressure sensor 8 is a thin-film type, model FSR402. It needs to be calibrated with a standard pressure calibrator before use to avoid moisture inside the seat affecting its accuracy.

[0037] When assembling the core transmission components of the drive assembly, the mating relationships must be clearly defined:

[0038] The flexible pin coupling, model HL2, is used.

[0039] The differential 5 is fixed to the built-in bracket of the seat body 1 by two hex bolts. The surface of the bracket needs to be pre-milled flat. After the bolts are tightened, the torque is checked with a torque wrench to prevent vibration from causing it to loosen.

[0040] Apply lithium-based grease to the outer spline end of the rotating rod 6 and slowly insert it into the inner spline hole of the differential 5. The insertion depth must ensure that the splines are fully engaged. After insertion, the rotating rod 6 should be able to rotate flexibly.

[0041] The buckles are made of PA66 nylon, with four buckles evenly distributed on each adjustment plate 7, two on the top and two on the bottom edges;

[0042] Installation steps: First, fit the curved surface of the adjustment plate 7 with the support frame of the backrest 2, and then insert the buckle into the buckle hole from the inside of the adjustment plate 7.

[0043] Two pressure sensors 8 are respectively installed on the inner walls of the left and right sides of the seat body 1 near the hinge of the backrest 2.

[0044] The sensor is attached to the inner wall of the seat body 1 with 3M double-sided tape. The wire is AWG24, made of copper core, and is arranged along the wiring harness channel of the seat body 1. It is fixed with cable ties. The end of the wire is soldered to the terminal and connected to the signal interface of the overload protection module L298N of the drive motor 4.

[0045] The limiting ring 9 is made of steel and is interference-fitted with the rotating rod 6. Six limiting holes are evenly opened on the outer circumference. The distribution angle of the limiting holes corresponds to the adjustment angle of the backrest 2: one hole corresponds to a 30° forward tilt and a 30° counterclockwise rotation from the vertical position of the backrest 2; one hole corresponds to a 110° backward tilt and a 110° clockwise rotation; and the other four holes are intermediate positioning holes spaced 20° apart.

[0046] After the limit ring 9 is heated and quickly fitted onto the rotating rod 6, it is cooled and then locked with an Allen head screw. The end of the screw is pressed against the recess on the surface of the rotating rod 6 to ensure that the limit ring 9 and the rotating rod 6 do not rotate relative to each other.

[0047] Working principle and usage process of this utility model:

[0048] Angle adjustment process:

[0049] Start the drive motor 4, and the power is transmitted to the differential 5 through the coupling. The differential 5 drives the rotating rod 6 to rotate through the spline.

[0050] The rotating rod 6 is connected to the adjusting plate 7. When the rotating rod 6 rotates, it drives the adjusting plate 7 to rotate, thus driving the backrest 2 to rotate around the hinged ear plate of the seat body 1, thereby realizing the forward / backward adjustment.

[0051] During the adjustment process, the differential 5 compensates for the gear meshing clearance to ensure accurate adjustment angle and stable adjustment speed of 5° / s.

[0052] Dynamic adaptation and overload protection process:

[0053] When the user leans against the backrest 2, two pressure sensors 8 on the seat body 1 detect the back pressure in real time.

[0054] If the pressure in a certain area exceeds 200N, such as excessive pressure on the waist, the sensor transmits a signal to the overload protection module of the drive motor 4 through the wire. The motor drives the backrest 2 to make a fine adjustment of ±2° until the pressure is uniform.

[0055] If the resistance is too high, such as when the backrest 2 is squeezed by external force, the pressure sensor 8 will detect a sudden increase in pressure exceeding 500N and immediately trigger the motor to stop to avoid overload damage.

[0056] Repair and disassembly process:

[0057] When maintenance or disassembly is required, the rotating rod 6 rotates, causing the limit ring 9 to rotate synchronously.

[0058] When the backrest 2 is tilted forward to 30° or backward to 110° in accordance with automotive seat safety standards, the connecting plate 14 is pushed to move, causing the limiting rod 12 to move. The moving limiting rod 12 causes the blocking plate 13 to move on the inner wall of the adjustment box 11. The moving blocking plate 13 compresses the return spring, and the moving limiting rod 12 is inserted into the limiting hole on one side of the limiting ring 9. After insertion, the fixing bolt 15 is rotated to move on the inner wall of the connecting plate 14. The moving fixing bolt 15 can be inserted into the fixing hole on one side of the adjustment box 11, thereby limiting and fixing the limiting rod 12, thus limiting and fixing the limiting ring 9, preventing the rotating rod 6 from continuing to rotate, and thus limiting and fixing the whole. When the limiting is released, the above steps are repeated in reverse, so that the fixing bolt 15 is pulled out of the fixing hole, and the spring force of the return spring resets the limiting rod 12, thus enabling use and adjustment, and thus enabling better disassembly and maintenance.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backrest adjustment device for an electric car seat, comprising a seat body (1), a backrest (2), and a headrest (3), characterized in that: It also includes a drive assembly, an adjustment assembly, and a limiting assembly. The drive assembly includes a drive motor (4), a differential (5), and a rotating rod (6). The output end of the drive motor (4) is connected to one end of the rotating rod (6) through the differential (5). The outer wall of the rotating rod (6) is rotatably connected to the inner wall of the seat body (1). The adjustment assembly includes an adjustment plate (7) and a pressure sensor (8). The adjustment plate (7) is detachably connected to one side of the backrest (2). The pressure sensor (8) is embedded in the inner wall of the seat body (1). The limiting assembly... The components include a limiting ring (9), a fixing plate (10), an adjusting box (11), a limiting rod (12), a blocking plate (13), a connecting plate (14), and a fixing bolt (15). The inner wall of the limiting ring (9) is fixed to the outer wall of the rotating rod (6). The limiting rod (12) is slidably connected to the inner wall of the adjusting box (11). The blocking plate (13) is fixed to the outer wall of the limiting rod (12). One end of the connecting plate (14) is fixed to one end of the limiting rod (12). The inner wall of the connecting plate (14) is threadedly connected to the outer wall of the fixing bolt (15).

2. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: The differential (5) is a planetary differential with a transmission ratio of 1:

30. The input end of the differential (5) is connected to the output end of the drive motor (4) through a coupling. The output end of the differential (5) is connected to one end of the rotating rod (6) through a spline.

3. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: The pressure sensor (8) is a thin-film pressure sensor, there are two in total, which are respectively installed on the inner wall of the seat body (1) and connected to the overload protection module of the drive motor (4) through wires.

4. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: The limiting ring (9) has several limiting holes on its outer periphery, and one end of the limiting rod (12) is inserted into the inner wall of the limiting hole.

5. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: A reset spring is fixedly installed between one side of the baffle plate (13) and the inner wall of the regulating box (11).

6. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: The adjustment plate (7) is made of arc-shaped polyurethane board, with a breathable mesh covering the surface, and is detachably connected to the support frame of the backrest (2) by buckles.

7. The backrest adjustment device for an electric car seat according to claim 1, characterized in that: The rotating rod (6) is made of steel shaft, and its outer wall is rotatably connected to the inner wall of the seat body (1). The outer wall of the rotating rod (6) is connected to the inner wall of the adjusting plate (7).

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