A skeleton structure with high tuning function

Abstract

This invention belongs to the field of automotive seat technology and relates to a frame structure with a height adjustment function, including a backrest frame, a lowering adjustment mechanism connecting plate, a front linkage, a rear linkage, a lead screw motor, and a base. The base is fixedly installed on the seat base. One end of the lead screw motor is hinged to the base, and the other end is connected to the backrest frame. The lower ends of both the front and rear linkages are hinged to the base, and the upper ends are hinged to the lowering adjustment mechanism connecting plate. The front and rear linkages, the base, and the lowering adjustment mechanism connecting plate form a four-bar linkage mechanism. The front end of the lowering adjustment mechanism connecting plate is hinged to the front linkage, the rear end is hinged to the rear linkage, and the top is fixedly connected to the backrest frame. The backrest frame is fixedly installed above the lowering adjustment mechanism connecting plate and is driven by the lead screw motor and guided by the four-bar linkage mechanism to achieve overall height adjustment. This invention provides a controllable lifting trajectory, structural stability, improved whiplash test results, and enhanced passenger safety; it is suitable for passengers of various heights, significantly improving passenger comfort and meeting the development needs of electric seats.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat technology, specifically relating to a frame structure adapted to automotive seats and having a backrest height adjustment function. Background Technology

[0002] As the automotive market rapidly evolves towards electrification and diversification, the usage scenarios for car seats are becoming increasingly diverse, placing higher demands on seat performance and comfort. Currently, seats need to adapt to multiple usage scenarios, with seat cushions featuring a reclining function and a split design for the seat and backrest. Simultaneously, seats need to incorporate high-adjustment features to further enhance passenger comfort and better meet the occupant experience needs in different usage scenarios.

[0003] Existing height-adjustable seats mostly use a single straight slide rail, achieving only partial extension and failing to adjust the overall backrest height. This results in poor back support adaptability for occupants of different heights. Furthermore, it's difficult to optimize whiplash test performance, compromising both safety and comfort. To effectively improve seat whiplash test scores, ensure occupant safety, and simultaneously address the comfort needs of individuals of different heights, resolving the issue of insufficient backrest support adaptability, there is an urgent need to develop a backrest frame with height adjustment capabilities. This functional optimization would achieve a dual improvement in safety and comfort, aligning with current market trends and core occupant needs. Summary of the Invention

[0004] The purpose of this invention is to provide a frame structure with a high-adjustment function to solve the problem of insufficient backrest support adaptability for passengers of different heights.

[0005] This invention is achieved through the following technical solution:

[0006] A backrest frame structure with high adjustment function includes a backrest frame, two downward adjustment angle connecting plates, two front connecting rods, two rear connecting rods, two lead screw motors and a base;

[0007] The base is fixedly installed on the seat base. The upper front end of the base is provided with a motor fixing end for fixing the lead screw motor. One end of the two lead screw motors is hinged to the motor fixing ends on the left and right sides of the base. The two front connecting rods and the rear connecting rod are located on the left and right sides of the upper part of the base, respectively. The middle part of the two front connecting rods is hinged to the other end of the lead screw motor, i.e. the output end.

[0008] The lower ends of the two front connecting rods are hinged to the base, and the upper ends are hinged to the front end of the lower angle adjuster connecting plate. The lower ends of the two rear connecting rods are hinged to the base, and the upper ends are hinged to the synchronous shaft passing through the rear end of the lower angle adjuster connecting plate. The front connecting rods, rear connecting rods, base, and lower angle adjuster connecting plate form a four-bar linkage. On the connecting frames on both sides of the base, there are pins with eccentric structures between the front and rear connecting rods. When the eccentric shaft is rotated, the eccentric profile of the shaft can change the position of the lower fulcrum of the rear connecting rod, thereby driving the four-bar linkage to move. The two lower angle adjuster connecting plates are connected synchronously through the synchronous shaft. The front end of the lower angle adjuster connecting plate is hinged to the front connecting rod, and the rear end is hinged to the synchronous shaft together with the rear connecting rod. The top of the lower angle adjuster connecting plate is fixedly connected to the backrest frame.

[0009] Furthermore, the base is fixedly installed on the seat base by bolts.

[0010] Furthermore, one end of each of the two lead screw motors is hinged to the motor fixed end on the left and right sides of the base via bolts and bushings, forming a rotatable connection. The other end of the lead screw motor, i.e. the output end, is hinged to the front connecting rod, forming a drive pair.

[0011] Furthermore, the two front connecting rods are hinged to the output end of the lead screw motor via bolts and bushings at their midpoints.

[0012] Furthermore, hinge holes are provided at both the upper and lower ends of the two front connecting rods and the two rear connecting rods, and bushings are press-fitted into the holes.

[0013] Furthermore, the shaft end of the eccentric pin is fixed to the slide rail by bolts for axial fixing and locking / limiting functions.

[0014] Furthermore, the top of the lowering bracket connecting plate is fixedly connected to the backrest frame by bolts.

[0015] Furthermore, the base is a one-piece molded structure with connecting frames on both sides.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention provides a frame structure with a height adjustment function, including a backrest frame, a lowering angle connecting plate, a front link, a rear link, a lead screw motor, and a base. The present invention uses a four-bar linkage structure to realize the height adjustment of the backrest, and can achieve a predetermined adjustment trajectory, thus having higher adaptability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the frame structure with high-adjustment function when the backrest is in its lowest position;

[0020] Figure 2 A schematic diagram of the frame structure with high-adjustment function when the backrest is in its highest position;

[0021] Figures 3-4 This is a partial structural diagram of the frame with high-adjustment function when the backrest is in its highest position.

[0022] Figures 5-6 for Figure 4 Side view;

[0023] Figure 7 An exploded view of the frame with a high-profile function when the backrest is at its highest position;

[0024] Figure 8 This is a schematic diagram of the backrest frame.

[0025] Figure 9 This is a schematic diagram of the structure of the lower angle adjustment device connecting plate;

[0026] Figure 10 This is a schematic diagram of the front connecting rod.

[0027] Figure 11 This is a schematic diagram of the structure of a lead screw motor;

[0028] Figure 12 This is a schematic diagram of the rear connecting rod.

[0029] Figure 13 This is a schematic diagram of the base structure. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0031] like Figures 1-13 As shown, the backrest frame structure with high adjustment function of the present invention includes a backrest frame, two downward adjustment angle connecting plates, two front connecting rods, two rear connecting rods, two lead screw motors and a base.

[0032] The base is bolted to the seat base, providing an installation reference and support for the entire mechanism. Specifically, the upper front end of the base has a motor mounting end for fixing the lead screw motor.

[0033] Two lead screw motors are connected at one end to the motor fixed ends on the left and right sides of the base by bolts and bushings to form a rotary connection. The other end of the lead screw motor, i.e. the output end, is connected to the middle of the front connecting rod to form a drive pair, which provides electric drive power for height adjustment.

[0034] Two front connecting rods and a rear connecting rod are located on the upper left and right sides of the base, respectively. The middle of the two front connecting rods is hinged to the output end of the lead screw motor via bolts and bushings. Hinge holes are provided at both the upper and lower ends of the two front and two rear connecting rods, with bushings press-fitted into these holes to reduce friction and improve rotational smoothness. In this invention, bolts pass through the hinge holes and bushings, and are locked in place with nuts, forming a hinge pair that can rotate relative to each other; this ensures both connection strength and the requirement for free rotation between components, ensuring smooth high-speed movement.

[0035] The lower ends of the two front connecting rods are hinged to the base, and the upper ends are hinged to the front end of the lower angle adjuster connecting plate. The lower ends of the two rear connecting rods are hinged to the base, and the upper ends are hinged to the synchronous shaft passing through the rear end of the lower angle adjuster connecting plate. The front connecting rods, rear connecting rods, base, and lower angle adjuster connecting plate constitute a four-bar linkage.

[0036] The base has eccentric pins on its side rails between the front and rear connecting rods. When the eccentric pins are rotated, their eccentric profile changes the position of the lower fulcrum of the rear connecting rod, causing the four-bar linkage to move and thus adjusting the height of the rear seat. The pin ends are fixed to the rails with bolts, providing axial fixation and locking, preventing accidental rotation of the eccentric pins and ensuring the stability of the seat position after adjustment.

[0037] In this invention, the base is a common one-piece molded structure found in existing technologies, with connecting frames on both sides. Two angle adjustment plate connecting plates are connected via a synchronous shaft, synchronously unlocking and adjusting the angles of the left and right angle adjustment plates to ensure smooth rotation and even force distribution on the backrest. The angle adjustment plate serves as a movable upper platform for a four-bar linkage mechanism; its front end is hinged to the front link, its rear end is hinged to the synchronous shaft along with the rear link, and its top is fixedly connected to the backrest frame. The angle adjustment plates are welded and fixed to the angle adjustment plate.

[0038] The backrest frame is fixedly installed above the adjusting arm connecting plate and is driven by a lead screw motor and guided by a four-bar linkage to achieve overall lifting. The rear linkage, through the displacement of the eccentric shaft, links with the front linkage to achieve overall seat height change and seat tilt angle adjustment, ensuring synchronous change of seat cushion height or differentiated adjustment as needed.

[0039] In this invention, a lead screw motor provides stable driving force to control the raising and lowering of the backrest frame, achieving a height adjustment function. A four-bar linkage, consisting of a front link, a rear link, a base, and a lowering angle adjustment plate, constrains the backrest frame to move along a preset trajectory, ensuring smooth, stable, and wobbly lifting and lowering. The lowering angle adjustment plate connects the four links to the backrest frame, transmitting motion and support force. The base provides a rigid mounting foundation, ensuring the overall structural strength and stability. The backrest frame, as the main body of the backrest, adjusts its height according to the four links, accommodating occupants of different heights.

[0040] This invention uses a four-bar linkage and an electric lead screw to achieve backrest height adjustment, which greatly improves support adaptability; the lifting trajectory is controllable, the structure is stable, improves whiplash test results, and enhances riding safety; it is suitable for passengers of various heights, significantly improves riding comfort, and meets the development needs of electric seats.

[0041] It will be understood by those skilled in the art that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A backrest frame structure with height adjustment function, characterized in that: It includes a backrest frame, two adjustable angle connecting plates, two front connecting rods, two rear connecting rods, two lead screw motors, and a base; The base is fixedly installed on the seat base. The upper front end of the base is provided with a motor fixing end for fixing the lead screw motor. One end of the two lead screw motors is hinged to the motor fixing ends on the left and right sides of the base. The two front connecting rods and the rear connecting rod are located on the left and right sides of the upper part of the base, respectively. The middle part of the two front connecting rods is hinged to the other end of the lead screw motor, i.e. the output end. The lower ends of the two front connecting rods are hinged to the base, and the upper ends are hinged to the front end of the lower angle adjuster connecting plate. The lower ends of the two rear connecting rods are hinged to the base, and the upper ends are hinged to the synchronous shaft passing through the rear end of the lower angle adjuster connecting plate. The front connecting rods, rear connecting rods, base, and lower angle adjuster connecting plate form a four-bar linkage. On the connecting frames on both sides of the base, there are pins with eccentric structures between the front and rear connecting rods. When the eccentric shaft is rotated, the eccentric profile of the shaft can change the position of the lower fulcrum of the rear connecting rod, thereby driving the four-bar linkage to move. The two lower angle adjuster connecting plates are connected synchronously through the synchronous shaft. The front end of the lower angle adjuster connecting plate is hinged to the front connecting rod, and the rear end is hinged to the synchronous shaft together with the rear connecting rod. The top of the lower angle adjuster connecting plate is fixedly connected to the backrest frame.

2. The backrest frame structure with height adjustment function according to claim 1, characterized in that: The base is fixedly installed on the seat base by bolts.

3. The backrest frame structure with height adjustment function according to claim 1, characterized in that: Two lead screw motors are connected at one end to the motor fixed ends on the left and right sides of the base by bolts and bushings to form a rotating connection. The other end of the lead screw motor, i.e. the output end, is connected to the front connecting rod to form a drive pair.

4. The backrest frame structure with height adjustment function according to claim 3, characterized in that: The two front connecting rods are hinged to the output end of the lead screw motor via bolts and bushings in the middle.

5. A backrest frame structure with height adjustment function according to claim 1, characterized in that: Hinge holes are provided at both the upper and lower ends of the two front connecting rods and the two rear connecting rods, and bushings are press-fitted into the holes.

6. The backrest frame structure with height adjustment function according to claim 1, characterized in that: The shaft end of the eccentrically shaped pin is fixed to the slide rail by bolts.

7. A backrest frame structure with height adjustment function according to claim 1, characterized in that: The top of the angle adjustment plate is fixedly connected to the backrest frame with bolts.

8. A backrest frame structure with height adjustment function according to claim 1, characterized in that: The base is a one-piece molded structure with connecting frames on both sides.

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