Seat cushion lifting mechanism for seat and backrest linkage

Abstract

The utility model relates to the technical field of automobile seat, concretely relates to a seat seat backrest linkage's cushion lifting mechanism, including backrest side plate support, cushion connecting rod pivot and sit and lie connecting rod, one end of backrest side plate support is fixedly connected with backrest skeleton frame, cushion connecting rod pivot is rotatably arranged on the seat frame skeleton subassembly, and both ends of cushion connecting rod pivot are provided with one end fixed connection's cushion outer connecting rod and cushion inner connecting rod respectively, the other end of cushion inner connecting rod is rotatably connected with the rear end of the sitting basin, both ends of sit and lie connecting rod are rotatably connected with the other end of backrest side plate support and the other end of cushion outer connecting rod respectively, when the seat frame skeleton subassembly rotates, can realize the passenger in the adjustment backrest process each position all has corresponding cushion height, reduces the height difference between the cushion and backrest, solves the problem that the structure of existing seat backrest linkage mechanism is complex.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, specifically to a seat cushion lifting mechanism that links the seat and backrest. Background Technology

[0002] Modern car seat backrests offer increasingly wider adjustment angles, even allowing for a fully reclined position. However, the seat cushion typically doesn't change height during backrest adjustment, creating a height difference at the lumbar region where the backrest and seat cushion connect. This can cause lumbar discomfort and poor comfort for passengers. To address this issue, car seats with synchronized backrest and seat adjustment can be designed. Existing patented technologies for synchronized backrest and seat adjustment enable the backrest and seat cushion to adjust in tandem, reducing the height difference and improving comfort. However, most of these technologies suffer from complex structures, difficulties in platform-based application, and insufficient feasibility for mass production.

[0003] Patent document publication number CN218141155U discloses a seat frame with a seat-back linkage, including a seat frame and a backrest rotatably mounted at the rear end of the seat frame. A seat basin is installed in the seat frame. The front end of the seat basin is rotatably connected to the seat frame, and a first connecting component is fixedly installed at the rear end. A second connecting component is fixedly installed at the lower end of the backrest. A linkage component is provided between the second connecting component and the first connecting component. The two ends of the linkage component are respectively hinged to the second connecting component and the first connecting component.

[0004] The seat can achieve a seat-back linkage function, but from its structure, the linkage mechanism is located inside the seat frame. When the seat cushion is raised, the linkage mechanism will move to a higher position, occupying the space at the lower end of the backrest foam, which makes it difficult to mass-produce. Moreover, since it is located inside the seat cushion foam and backrest foam, an additional shielding design for the linkage mechanism is required, making the structure complex and limiting its platform application. Utility Model Content

[0005] Therefore, it is necessary to address the problems of existing technologies by providing a seat cushion lifting mechanism that links the seat and backrest. This mechanism involves setting a rotatable seat cushion linkage shaft on the seat frame assembly, and setting a backrest side panel bracket and a seat cushion linkage rotatably connected to the backrest side panel bracket on the backrest frame. The two ends of the seat cushion linkage shaft are respectively provided with an outer seat cushion linkage and an inner seat cushion linkage. When the seat frame assembly rotates, it can ensure that the passenger has a corresponding seat cushion height at each position during backrest adjustment, reducing the height difference between the seat cushion and the backrest, and solving the problem of complex structure in existing seat-backrest linkage mechanisms.

[0006] To address the problems of existing technologies, this utility model provides a seat cushion lifting mechanism that links the seat and backrest. This mechanism guides the rear end of the seat basin to lift relative to the seat frame assembly when the backrest frame rotates backward. It includes a backrest side panel bracket, a seat cushion connecting rod shaft, and a seat-back connecting rod. One end of the backrest side panel bracket is fixedly connected to the backrest frame. The seat cushion connecting rod shaft is rotatably mounted on the seat frame assembly. Each end of the seat cushion connecting rod shaft has an outer seat cushion connecting rod and an inner seat cushion connecting rod, one end of which is fixedly connected to the shaft. The other end of the inner seat cushion connecting rod is rotatably connected to the rear end of the seat basin. Both ends of the seat-back connecting rod are rotatably connected to the other ends of the backrest side panel bracket and the outer seat cushion connecting rod, respectively. When the backrest frame rotates backward, the seat cushion connecting rod shaft rotates counterclockwise on the seat frame assembly to lift the rear end of the seat basin upward via the inner seat cushion connecting rod.

[0007] Preferably, the front end of the seat frame assembly is provided with a small front horizontal tube, and the bottom of the front end of the seat basin is provided with a seat basin limiting plastic part that slides with the small front horizontal tube.

[0008] Preferably, the bottom of the seat retaining plastic part is provided with a retaining notch with an elongated groove structure, and the small front horizontal tube is slidably disposed in the retaining notch.

[0009] Preferably, the seat cushion connecting rod pivot has an outer end and an inner end on the seat frame assembly, the outer end being connected to the outer connecting rod of the seat cushion, and the inner end being connected to the inner connecting rod of the seat cushion.

[0010] Preferably, the seat cushion lifting mechanism is symmetrically arranged on both sides of the seat cushion and the backrest.

[0011] Preferably, both ends of the seat-back linkage are provided with round holes. The round hole at one end of the seat-back linkage is rotatably connected to the backrest side panel bracket, and the round hole at the other end of the seat-back linkage is rotatably connected to the outer linkage of the seat cushion.

[0012] The advantages of this application compared to the prior art are:

[0013] This application incorporates a rotatable seat cushion linkage shaft on the seat frame assembly, and a backrest side panel bracket and a seat-back linkage rotatably connected to the backrest side panel bracket on the backrest frame. An outer seat cushion linkage and an inner seat cushion linkage are respectively located at both ends of the seat cushion linkage shaft. When the seat frame assembly rotates, this reduces the height difference between the car seat back and the seat cushion after adjustment, improving passenger comfort. Simultaneously, the spatial layout of the linkage mechanism is optimized, without occupying internal space within the seat frame, and can accommodate common car seat frame platforms on the market. Furthermore, the linkage mechanism is primarily assembled on the outside of the seat frame, facilitating assembly and manufacturing. Compared to existing technologies, the entire linkage mechanism of this solution mainly consists of linkages, resulting in a simple structure and high feasibility. Attached Figure Description

[0014] Figure 1 It's a 3D model of the seat.

[0015] Figure 2 This is a 3D exploded view of the seat.

[0016] Figure 3 This is a three-dimensional exploded view of a seat cushion lifting mechanism that links the seat and backrest in a seat.

[0017] Figure 4 This is a schematic diagram of a seat cushion lifting mechanism that links the seat and backrest when the backrest frame is at its forwardmost angle.

[0018] Figure 5 This is a schematic diagram of a seat cushion lifting mechanism that links the seat and backrest when the backrest frame is at its final angle.

[0019] Figure 6 This is a simplified diagram illustrating the motion principle of a seat cushion lifting mechanism that links the seat and backrest.

[0020] The diagram is labeled as follows: A. Backrest frame assembly; B. Seat frame assembly; C. Seat basin assembly; D. Seat and backrest fastening bolts; E. Seat basin limiting plastic parts; 1. Backrest frame; 2. Backrest side panel bracket; 3. Seat and backrest connecting rod; 4. Rivet; 5. Self-lubricating bushing; 6. Seat cushion outer connecting rod; 7. Seat cushion frame; 8. Seat cushion connecting rod pivot; 9. Seat cushion connecting rod bushing; 10. Seat cushion inner connecting rod; 11. Small front cross tube; 12. Seat basin bracket; 13. Seat basin; 14. Bolt; 15. Rear cross tube; 16. Large front cross tube. Detailed Implementation

[0021] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0022] like Figures 1-6 As shown, a seat cushion lifting mechanism for seat back linkage is used to guide the rear end of the seat basin 13 to lift upward relative to the seat frame assembly B when the backrest frame 1 rotates backward. It includes a backrest side panel bracket 2, a seat cushion connecting rod shaft 8, and a seat back linkage 3. One end of the backrest side panel bracket 2 is fixedly connected to the backrest frame 1. The seat cushion connecting rod shaft 8 is rotatably mounted on the seat frame assembly B. Each end of the seat cushion connecting rod shaft 8 has an outer seat cushion connecting rod 6 and an inner seat cushion connecting rod 10, one end of which is fixedly connected to the shaft. The other end of the inner seat cushion connecting rod 10 is rotatably connected to the rear end of the seat basin 13. Both ends of the seat back linkage 3 are rotatably connected to the other ends of the backrest side panel bracket 2 and the outer seat cushion connecting rod 6, respectively. When the backrest frame 1 rotates backward, the seat cushion connecting rod shaft 8 rotates counterclockwise on the seat frame assembly B to lift the rear end of the seat basin 13 upward via the inner seat cushion connecting rod 10.

[0023] The front end of the seat frame assembly B is provided with a small front horizontal tube 11, and the bottom of the front end of the seat basin 13 is provided with a seat basin limiting plastic part 13 that slides with the small front horizontal tube 11.

[0024] The bottom of the pot seat limiting plastic part 13 is provided with a limiting notch with an elongated groove structure, and the small front horizontal tube 11 is slidably disposed in the limiting notch.

[0025] The seat cushion connecting rod pivot 8 has an outer end and an inner end on the seat frame assembly B. The outer end is connected to the outer seat cushion connecting rod 6, and the inner end is connected to the inner seat cushion connecting rod 10.

[0026] When the seat cushion connecting rod shaft 8 rotates, the angle between the outer seat cushion connecting rod 6 and the inner seat cushion connecting rod 10 remains unchanged.

[0027] The seat lifting mechanism is symmetrically arranged on both sides of the seat and backrest.

[0028] Both ends of the seat-back linkage 3 are provided with round holes. The round hole at one end of the seat-back linkage 3 is rotatably connected to the backrest side panel bracket 2, and the round hole at the other end of the seat-back linkage 3 is rotatably connected to the outer linkage 6 of the seat cushion.

[0029] The backrest frame assembly consists of a backrest frame 1, a backrest side panel bracket 2, a seat / backrest linkage 3, rivets 4, and a self-lubricating bushing 5. The backrest frame 1 can rotate around its own angle adjuster and is a common backrest adjustment structure. The backrest frame 1 includes a backrest side panel and a backrest motor. The backrest side panel has two holes for fixing the backrest side panel bracket 2. One end of the backrest side panel bracket 2 has a round hole, on which a self-lubricating bushing 5 is fitted. This reduces the contact area between the two linkages after hinge, allowing the two linkages to rotate freely and reducing the coefficient of friction. The other end has two bolt 14 fixing holes, allowing the backrest side panel bracket 2 to be installed on the backrest side panel by tightening the bolts 14. The seat / backrest linkage 3 has a round hole at each end. The round hole at one end of the seat / backrest linkage 3 is hinged to the round hole of the backrest side panel bracket 2 by riveting with rivets 4. After assembly, both the seat / backrest linkage 3 and the backrest side panel bracket 2 can rotate around the hinge hole.

[0030] The seat frame assembly B consists of an outer seat cushion link 6, a seat cushion frame 7, a seat cushion link shaft 8, a seat cushion link bushing 9, and an inner seat cushion link 10. The outer seat cushion link 6 has a round hole at each end, one of which is designed with a threaded structure for mounting a bolt 14. The round hole at the threaded end of the outer seat cushion link 6 can be fastened to the round hole of the seat back link 3 using bolts 14. The other round hole of the outer seat cushion link 6 is assembled and welded to one end of the seat cushion link shaft 8, ensuring that the welded seat cushion link shaft 8 and the outer seat cushion link 6 cannot rotate relative to each other. The seat cushion frame 7 consists of a seat cushion side plate, a seat cushion side plate shaft bracket, a large front cross tube 16, a small front cross tube 11, a rear cross tube 15, and a slide rail assembly. The seat cushion side plate has round holes for mounting the seat cushion link shaft 8, and the seat cushion side plate shaft bracket is welded to the two round holes on the seat cushion side plate. The small front cross tube 11 is fixed to the seat cushion side plate by welding. The assembly of other sub-components of the seat cushion frame 7 belongs to the common seat cushion skeleton assembly B layout structure, which will not be elaborated here. The seat cushion connecting rod shaft 8 can pass through the seat cushion side plate shaft bracket and the seat cushion side plate, and can rotate within the three concentric holes. The seat cushion connecting rod bushing 9 is fitted on the inner end of the seat cushion connecting rod shaft 8, and can position the inner seat cushion connecting rod 10 after the seat cushion connecting rod shaft is installed from the outside to the inside. Both ends of the inner seat cushion connecting rod 10 have round holes. The other end of the seat cushion connecting rod shaft 8 can pass through the round hole at one end of the inner seat cushion connecting rod 10, and the two are fixed together by welding. After welding, the seat cushion connecting rod shaft 8 and the inner seat cushion connecting rod 10 cannot rotate relative to each other.

[0031] Both the adjusting plate of the backrest frame 1 and the seat cushion side plate of the seat frame assembly B have bolt 14 mounting holes. The adjusting plate and the seat cushion side plate can be fixed together by tightening the bolts 14. The adjusting plate of the backrest frame 1 and the backrest frame 1 can rotate around the adjusting axis. This is a common backrest frame arrangement structure, which will not be elaborated here.

[0032] The plastic seat assembly C consists of a seat support 12 and a seat 13; a seat cushion foam can be installed on the seat, and when the seat rises or falls, it drives the seat cushion foam to rise or fall; the seat support 12 and the seat 13 are fastened together by bolts 14; both sides of the seat support 12 have round hole structures, which can be riveted to the other end of the inner connecting rod 10 of the seat cushion by rivets 4.

[0033] The interior of the seat-limiting plastic part E has an elongated groove structure with a limiting notch, which can be fitted onto the small front horizontal tube 11. After being fixed, the small front horizontal tube 11 can limit the movement of the seat-limiting plastic part E. The upper part of the seat-limiting plastic part E also has bolt 14 mounting holes, which can be fastened to the seat 13 by bolts 14.

[0034] The linkage mechanism consisting of the backrest side panel bracket 2, seat back linkage 3, seat cushion outer linkage 6, seat cushion linkage pivot 8, seat cushion linkage bushing 9, and seat cushion inner linkage 10 is symmetrically designed on both sides of the seat cushion and serves the same function. Through the design of the linkage mechanism on both sides, the transmission force of the linkage mechanism on one side can be reduced, and the linkage function can be ensured to be stable. The composition and assembly of the parts on the other side will not be described again here.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, a type of linked car seat frame includes sub-components such as backrest frame assembly A, seat frame frame assembly B, seat basin assembly C, seat fastening bolts D, and seat basin limiting plastic parts E, which can be assembled together. Figure 6 As can be seen from the principle of remote control, the linkage mechanism can be simplified to a parallelogram, wherein the backrest frame assembly and the seat assembly C belong to two parallel sides of the parallelogram.

[0036] The backrest frame assembly A rotates backward in conjunction with the rear end of the seat assembly C lifting, as follows: Figure 4 The backrest frame assembly A is initially in its forwardmost position, while the seat frame assembly B is fixed to the vehicle body and cannot move. When the passenger adjusts the angle of the backrest frame assembly A, the backrest motor is activated via a switch button on the seat. This drives the backrest frame 1 to rotate backward around the adjuster axis, which in turn causes the backrest side panel bracket 2 to rotate counterclockwise around the adjuster axis. One end of the seat-back linkage 3, hinged to the backrest side panel bracket 2, also rotates counterclockwise around the adjuster axis. Simultaneously, the seat cushion linkage shaft 8, fitted into the round hole in the seat cushion side panel, can only rotate on its own and cannot translate. According to the parallelogram principle, the outer seat cushion linkage 6 will also rotate counterclockwise around the seat cushion linkage shaft 8, simultaneously causing the welded seat cushion linkage shaft 8 to rotate counterclockwise, which in turn causes the linkage welded to the seat cushion to rotate. When the connecting rod 10 inside the seat cushion rotates counterclockwise around the axis of the connecting rod 8, the non-welded end of the connecting rod 10 inside the seat cushion is lifted upwards. The non-welded end of the connecting rod 10 inside the seat cushion is hinged to the seat basin support 12. According to the schematic diagram, the seat basin support 12, which is hinged to the connecting rod 10 inside the seat cushion, will drive the seat basin 13 to move clockwise upwards around the small front horizontal tube 11 (the other end of the seat basin 13 is restricted within the seat basin limiting plastic part E and can only move around the small front horizontal tube 11). That is, the rear end of the seat basin 13 of the seat cushion is lifted upwards and moves forward at the same time. This ultimately realizes the linkage function between the backrest and the seat cushion, reduces the height difference between the backrest and the seat cushion during the adjustment process, and improves passenger comfort.

[0037] The backrest rotates forward and the rear of the seat cushion lowers in tandem: such as Figure 5The backrest frame assembly A is initially in its rearmost position, while the seat frame assembly B is fixed to the vehicle body and cannot move. When the passenger adjusts the backrest angle forward, the backrest motor is activated via a switch button on the seat. This drives the backrest frame 1 to rotate rearward around the adjuster axis, which in turn causes the backrest side panel bracket 2 to rotate clockwise around the adjuster axis. One end of the seat-back linkage 3, hinged to the backrest side panel bracket 2, also rotates clockwise around the adjuster axis. Simultaneously, the seat cushion linkage shaft 8, fitted into the round hole in the seat cushion side panel, can only rotate on its own and cannot translate. According to the parallelogram principle, the outer seat cushion linkage 6 will also rotate clockwise around the seat cushion linkage shaft 8, simultaneously causing the welded seat cushion linkage shaft 8 to rotate clockwise; this, in turn, causes the welded... When the inner connecting rod of the seat cushion at the other end of the seat cushion connecting rod shaft 8 rotates clockwise around the axis of the seat cushion connecting rod shaft 8, it causes the non-welded end of the inner connecting rod 10 of the seat cushion to move downward. The non-welded end of the inner connecting rod 10 of the seat cushion is hinged to the seat basin support 12. According to the schematic diagram, the seat basin support 12, which is hinged to the inner connecting rod 10 of the seat cushion, will cause the seat basin to move counterclockwise downward around the small front horizontal tube 11 (the other end of the seat basin is restricted within the seat basin limiting plastic part E and can only move around the small front horizontal tube 11). That is, the rear end of the seat basin 13 of the seat cushion moves downward and backward at the same time. Finally, the linkage function between the backrest and the seat cushion is realized, which reduces the height difference between the backrest and the seat cushion during the adjustment process and improves passenger comfort.

[0038] At this time, the linkage function of the seat cushion and backrest of the patented product is realized. According to the layout structure shown in this application, the patented product can complete the seat support height adjustment within the range of 0-64mm. It can meet the seat cushion linkage adjustment within the range of backrest angle adjustment from the foremost position to zero gravity mode or reclining mode, so that passengers have corresponding seat cushion heights in each position during backrest adjustment, reducing the height difference between the seat cushion and backrest.

[0039] The structural advantages of this application are as follows: Compared with the solution of Chinese patent CN117124944, which uses a sliding groove fit between the backrest fixing plate and the drive linkage, the two are in line contact, and long-term motion friction is prone to wear problems; the rotating area of ​​the patented product described herein uses a linkage drive solution in which the rotating positions are all fitted with bushings, and the two are in surface contact, resulting in low pressure per unit area, greater wear resistance, and a more optimized linkage structure.

[0040] Advantages of this application: Compared to the solution of Chinese patent CN 218141155U, whose seat-back linkage mechanism is located inside the lower part of the backrest frame, there are problems such as insufficient seat foam space and difficulty in covering the backrest with a cover. However, the linkage mechanism of this patent is located in the seat cushion guard area, and the linkage outside the seat cushion can be transmitted to the seat cushion basin through the pivot. Moreover, the linkage mechanism located in the seat cushion guard area can prevent the frame from being exposed by installing a conventional seat cushion guard, and does not occupy the original backrest foam space, thus not affecting the comfort of the seat.

[0041] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A seat cushion lifting mechanism linked to a seat backrest, used to guide the rear end of the seat basin to lift upward relative to the seat frame assembly when the backrest frame rotates backward, characterized in that, Includes the backrest side panel bracket, seat cushion linkage pivot, and seat / backrest linkage. One end of the backrest side panel bracket is fixedly connected to the backrest frame; The seat cushion connecting rod shaft is rotatably mounted on the seat frame assembly. At each end of the seat cushion connecting rod shaft, there is an outer seat cushion connecting rod and an inner seat cushion connecting rod, one end of which is fixedly connected to the shaft. The other end of the inner seat cushion connecting rod is rotatably connected to the rear end of the seat basin. The two ends of the seat back linkage are rotatably connected to the other end of the backrest side panel bracket and the other end of the seat cushion outer linkage, respectively. When the backrest frame rotates backward, the seat cushion linkage shaft rotates counterclockwise on the seat frame assembly to drive the rear end of the seat basin upward through the seat cushion inner linkage.

2. The seat cushion lifting mechanism for seat back linkage according to claim 1, characterized in that, The front end of the seat frame assembly is provided with a small front horizontal tube, and the bottom of the front end of the seat basin is provided with a seat basin limiting plastic part that slides with the small front horizontal tube.

3. The seat cushion lifting mechanism for seat back linkage according to claim 2, characterized in that, The bottom of the pot seat retaining plastic part is provided with a retaining notch with an elongated groove structure, and the small front horizontal tube is slidably disposed in the retaining notch.

4. A seat cushion lifting mechanism for seat backrest linkage according to any one of claims 1-3, characterized in that, The seat cushion connecting rod pivot has an outer end and an inner end on the seat frame assembly. The outer end is connected to the outer connecting rod of the seat cushion, and the inner end is connected to the inner connecting rod of the seat cushion.

5. A seat cushion lifting mechanism for seat backrest linkage according to any one of claims 1-3, characterized in that, The seat lifting mechanism is symmetrically arranged on both sides of the seat and backrest.

6. A seat cushion lifting mechanism for seat backrest linkage according to any one of claims 1-3, characterized in that, Both ends of the seat-back linkage are provided with round holes. The round hole at one end of the seat-back linkage is rotatably connected to the backrest side panel bracket, and the round hole at the other end of the seat-back linkage is rotatably connected to the outer linkage of the seat cushion.

Images