Seat assembly for motor vehicle

Abstract

A seat assembly (1) for a motor vehicle, the seat assembly comprising: a base assembly; a seat cushion (2); a seat backrest (3); first and second backrest driving devices; and a linkage mechanism, which drives the seat assembly to move between a plurality of positions. The linkage mechanism comprises a first linkage mechanism (151) and a second linkage mechanism (152). The first linkage mechanism comprises a first linkage member (1511), a second linkage member (1512), and a third linkage member (1513), wherein movable ends of the first and second linkage members are pivotally connected to a first foot portion (1513-1) and a second foot portion (1513-2) of the third linkage member, respectively, and the bottom end of the seat backrest is pivotally connected to a third foot portion (1513-3) of the third linkage member. The first backrest driving device drives the first or second linkage member, and the second backrest driving device drives the seat backrest to pivot. The second linkage mechanism comprises a first linkage member (1521), a second linkage member (1522) and a third linkage member (1523), wherein one end of the seat cushion is pivotally connected to a movable end (1521-2) of the first linkage member, and the other end is pivotally connected to a first movable end (1522-1) of the second linkage member, and a second movable end (1522-2) of the second linkage member is pivotally connected to a movable end (1523-2) of the third linkage member. Said assembly has superior strength performance.

Description

Seating components for motor vehicles

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 202422643682.X, filed on October 30, 2024, entitled “Seat Assembly for Motor Vehicles”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to the technical field of vehicle seats. More particularly, this disclosure relates to a seat assembly for a motor vehicle. Background Technology

[0004] Seating assemblies for motor vehicles typically include a seat cushion and a seat back. It is known in the art to design seating assemblies for motor vehicles to be movable between two or more positions to provide a more comfortable seating experience for occupants. For example, some seating assemblies are designed to be movable between a folded position, a designed position, and an easy-access (also known as “EZE”) position. In the folded position, the seat back pivots toward the seat cushion and folds over it to increase, for example, cargo space in the motor vehicle. In the easy-access position, at least the seat back of the seating assembly can tilt forward to increase access space behind the seating assembly. Some seating assemblies are also designed to include a reclining position, in which the seat back pivots away from the seat cushion to a substantially horizontal position, thus forming a “double bed mode” or “double bed state” so that an occupant can lie down on the seating assembly. Other seating assemblies are designed to include a “zero-gravity” position, in which an occupant can sit on the seating assembly in a substantially zero-pressure posture, thus feeling more comfortable.

[0005] However, while existing seat assemblies offer some angle adjustment for functions such as folding, reclining, and easy entry, the bottom of the backrest is typically mounted on the seat cushion (or its frame), or the angle adjustment is usually driven by a single motor. This structure presents several drawbacks. For example, because the bottom of the backrest is attached to the seat cushion, the center of rotation cannot be adjusted independently of the seat cushion. This makes it difficult to achieve the most comfortable seating experience in certain positions. For instance, when the seat is reclined, the seat cushion and / or backrest cannot be adjusted independently of each other, potentially creating a height difference between the seat cushion and the horizontally positioned backrest, thus affecting the occupant's reclining experience. Alternatively, when the seat assembly is in a zero-gravity position, the bottom of the seat back may be pressing against the occupant's lower back, while the top of the seat back may not be in contact with the occupant's shoulders, resulting in problems such as the occupant being pushed against their lower back and lacking shoulder support, thus affecting the occupant's riding experience.

[0006] Therefore, there is a need to improve existing seat components. Summary of the Invention

[0007] According to some embodiments of this disclosure, a seat assembly for a motor vehicle is provided. The seat assembly includes: a base assembly; a seat cushion; a seat back; a first backrest drive; a second backrest drive; and a linkage mechanism configured to move the seat assembly between multiple positions; wherein the linkage mechanism includes a first linkage mechanism for the seat back and a second linkage mechanism for the seat cushion, the first linkage mechanism and the second linkage mechanism being configured to be driven independently of each other; wherein the first linkage mechanism includes a first linkage member, a second linkage member, and a third linkage member, the first linkage member including a constrained end and a movable end, the second linkage member including a constrained end and a movable end, and the third linkage member including a first foot, a second foot, and a third foot, wherein the movable ends of the first linkage member and the second linkage member are pivotally connected to the first and second feet of the third linkage member, respectively, and the bottom end of the seat back near the seat cushion is pivotally connected to the third foot of the third linkage member, wherein the first backrest drive is driven... At least one of the first linkage and the second linkage is configured to pivot the first linkage and the second linkage about a first pivot portion disposed at their respective constraint ends, while the second backrest drive device drives the seat back to pivot about a second pivot portion disposed at the third foot of the third linkage; and wherein the second linkage mechanism includes a first linkage, a second linkage, and a third linkage, the first linkage of the second linkage mechanism including a constraint end and a movable end, the second linkage of the second linkage mechanism including a first movable end and a second movable end, the third linkage of the second linkage mechanism including a constraint end and a movable end, wherein one end of the seat cushion near the seat back is pivotally connected to the movable end of the first linkage of the second linkage mechanism, and the other end away from the seat back is pivotally connected to the first movable end of the second linkage of the second linkage mechanism, and the second movable end of the second linkage of the second linkage mechanism is pivotally connected to the movable end of the third linkage of the second linkage mechanism.

[0008] According to some embodiments of this disclosure, the constraint end of the first linkage member of the first linkage mechanism, the constraint end of the second linkage member of the first linkage mechanism, the constraint end of the first linkage member of the second linkage mechanism, and the constraint end of the third linkage member of the second linkage mechanism are pivotally mounted on the vehicle floor, or pivotally mounted on a slide rail that can slide relative to the vehicle floor to move the seat assembly, or pivotally mounted on a rotating component that can rotate relative to the vehicle floor to rotate the seat assembly about a vertical direction.

[0009] According to some embodiments of this disclosure, one of the second linkage member and the third linkage member of the second linkage mechanism is configured as a zero-gravity linkage member for realizing the zero-gravity position of the seat assembly.

[0010] According to some embodiments of this disclosure, the seat assembly further includes a first seat cushion drive device and a second seat cushion drive device. The first seat cushion drive device is used to drive a first linkage member of the second linkage mechanism to pivot around a first pivot portion disposed at the constraint end of the first linkage member of the second linkage mechanism, while the second seat cushion drive device is used to drive the zero-gravity linkage member to pivot.

[0011] According to some embodiments of this disclosure, when the constraint end of the first linkage member of the first linkage mechanism, the constraint end of the second linkage member of the first linkage mechanism, the constraint end of the first linkage member of the second linkage mechanism, and the constraint end of the third linkage member of the second linkage mechanism are pivotally mounted on the slide rail, the seat assembly further includes a slide rail drive device for driving the slide rail to move linearly.

[0012] According to some embodiments of this disclosure, the third linkage component of the first linkage mechanism is configured as a connecting plate.

[0013] According to some embodiments of this disclosure, the seat back includes a backrest frame, wherein the first backrest drive device and the first linkage member and the second linkage member of the first linkage mechanism are mounted on the base assembly, and the second backrest drive device and the third linkage member of the first linkage mechanism are mounted on the backrest frame of the seat back.

[0014] According to some embodiments of this disclosure, each of the first backrest drive device and the second backrest drive device includes a motor and an angle adjuster.

[0015] According to some embodiments of this disclosure, the seat cushion includes a seat cushion frame, the seat cushion frame including two side connectors located on the left and right sides, a front connector for connecting the two side connectors at the front of the two side connectors, and a rear connector for connecting the two side connectors at the rear of the two side connectors; wherein, the second linkage mechanism includes two first linkage members, the two first linkage members of the second linkage mechanism being respectively installed on the left and right sides of the seat cushion frame at the rear of the two side connectors.

[0016] According to some embodiments of this disclosure, the first seat cushion drive device includes a motor and an angle adjuster, and a seat cushion motor mounting bracket for mounting the motor of the first seat cushion drive device is provided on the inner side of one of the two side connectors.

[0017] According to some embodiments of this disclosure, the second linkage member of the second linkage mechanism is pivotally mounted on the front of the seat cushion frame.

[0018] According to some embodiments of this disclosure, the third linkage of the second linkage mechanism is configured as a zero-gravity linkage for realizing the zero-gravity position of the seat assembly, and the constraint end of the third linkage is pivotally mounted to the base assembly.

[0019] According to some embodiments of this disclosure, the second linkage mechanism includes two third linkage members spaced apart from each other, and the two third linkage members of the second linkage mechanism are connected together via a connector. The second seat cushion drive device includes a zero-gravity motor, and one end of the connector for connecting the two third linkage members of the second linkage mechanism is provided with a zero-gravity motor mounting bracket for mounting the zero-gravity motor.

[0020] According to some embodiments of this disclosure, the seat assembly moves between a designed position, a high-adjustment position, the zero-gravity position, a folded position, a reclining position, and an easy-entry position under the drive of one or more of the first backrest drive device, the second backrest drive device, the first seat cushion drive device, and the second seat cushion drive device. In the designed position, the seat back of the seat assembly forms a predetermined angle with respect to the seat cushion to support the occupant. In the high-adjustment position, the seat cushion of the seat assembly is raised or lowered by a predetermined height relative to the designed position. In the zero-gravity position, the seat assembly is adjusted to a designed zero-pressure state. In the folded position, the seat back of the seat assembly and the seat cushion are substantially stacked to increase the space of the vehicle. In the reclining position, the seat back of the seat assembly and the seat cushion are substantially flush. And in the easy-entry position, the seat back of the seat assembly pivots towards the seat cushion by a predetermined angle relative to the designed position and / or the seat cushion moves forward a predetermined distance relative to the designed position to increase the space behind the seat assembly.

[0021] According to some embodiments of this disclosure, during the movement of the seat assembly from the designed position to the zero-gravity position, the first seat cushion drive device locks the first linkage member of the second linkage mechanism so that it cannot move; and during the movement of the seat assembly from the designed position to other positions besides the zero-gravity position, the second seat cushion drive device locks the zero-gravity linkage member of the second linkage mechanism so that it cannot move.

[0022] It should be noted that aspects of this disclosure described with respect to one embodiment can be included in other different embodiments, although these other different embodiments are not specifically described. In other words, features of all embodiments and / or any embodiments can be combined in any manner and / or combination, as long as they do not contradict each other. Attached Figure Description

[0023] Many aspects of this disclosure will be better understood after reading the following detailed description in conjunction with the accompanying drawings, in which:

[0024] Figures 1a and 1b are perspective views of a seat assembly for a motor vehicle according to an embodiment of the present disclosure, shown from different angles.

[0025] Figure 2a is a side view of the seat assembly shown in Figures 1a and 1b;

[0026] Figure 2b is a schematic diagram of the linkage mechanism of a seat assembly according to an embodiment of the present disclosure, wherein the linkage mechanism is in the designed position;

[0027] Figure 2c is a schematic diagram of the linkage mechanism of a seat assembly according to another embodiment of the present disclosure, wherein the linkage mechanism is in the designed position;

[0028] Figure 2d is a schematic diagram and side view of the first linkage mechanism shown in Figure 2b or Figure 2c when it pivots backward to the final position.

[0029] Figure 2e is a schematic diagram and side view of the first linkage mechanism shown in Figure 2b or Figure 2c when it pivots forward to the foremost position.

[0030] Figure 3 is a perspective view of the backrest frame of a seat back of a seat assembly according to an embodiment of the present disclosure.

[0031] Figure 4a is a perspective view of a seat cushion frame according to an embodiment of the present disclosure;

[0032] Figure 4b is an anatomical diagram of the seat cushion frame shown in Figure 4a;

[0033] Figure 5a is a perspective view of a seat cushion frame with a front linkage mounted according to an embodiment of the present disclosure.

[0034] Figure 5b is a schematic diagram of the assembly of the seat frame and front linkage of Figure 4a;

[0035] Figure 6a is a perspective view of the base assembly of a seat assembly according to an embodiment of the present disclosure;

[0036] Figure 6b is an anatomical diagram of the base assembly shown in Figure 6a;

[0037] Figure 7a is a perspective view of a seat assembly according to an embodiment of the present disclosure, showing a base assembly with a zero-gravity linkage installed.

[0038] Figure 7b is a schematic diagram of the assembly of the base assembly and the zero-gravity linkage shown in Figure 6a;

[0039] Figures 8a and 8b are schematic diagrams showing, from different angles, a zero-gravity linkage directly driven by an angle adjuster according to another embodiment.

[0040] Figure 9a is a schematic diagram of the assembly of the seat frame shown in Figure 5a and the base assembly shown in Figure 7a;

[0041] Figure 9b is a perspective view of the seat assembly formed by assembling the seat frame shown in Figure 5a and the base assembly shown in Figure 7a together.

[0042] Figure 9c is a schematic diagram of the assembly of the backrest frame shown in Figure 3 and the seat cushion assembly shown in Figure 9b.

[0043] Figure 10a is a side view of the seat assembly in a high-profile position;

[0044] Figures 10b and 10c are schematic diagrams of the linkage mechanism during the process from the design position to the high-profile position;

[0045] Figure 11a is a side view of the seat assembly in a zero-gravity position;

[0046] Figures 11b and 11c are schematic diagrams of the linkage mechanism during the process from the design position to the zero gravity position;

[0047] Figure 12a is a comparison diagram of the linkage mechanism of the prior art seat assembly and the linkage mechanism of the seat assembly according to the present disclosure when both are in a zero-gravity position.

[0048] Figure 12b is a schematic diagram of an occupant sitting on a prior art seat assembly in a zero-gravity position;

[0049] Figure 12c is a schematic diagram of an occupant sitting on a seat assembly according to the present disclosure in a zero-gravity position;

[0050] Figure 13a is a side view of the seat assembly in the folded position;

[0051] Figures 13b and 13c are schematic diagrams of the linkage mechanism driving the process from the design position to the folding position;

[0052] Figure 14a is a side view of the seat assembly in the easy-access position;

[0053] Figures 14b and 14c are schematic diagrams of the linkage mechanism during the process from the design position to the convenient access position;

[0054] Figure 15a is a side view of the seat assembly in a reclining position;

[0055] Figures 15b and 15c are schematic diagrams of the linkage mechanism during the process from the design position to the lying position.

[0056] Figure 15d is a schematic diagram showing that when the seat assembly according to this disclosure is in a reclining position, there is essentially no height difference between the bottom end of the seat back and the rear end of the seat cushion.

[0057] Figures 16a and 16b are force analysis diagrams of a first linkage mechanism with another concept and a force analysis diagram of a first linkage mechanism according to the present disclosure, respectively.

[0058] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of some features may be altered and they may not be drawn to scale. Detailed Implementation

[0059] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0060] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0061] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0062] When a component is described in the specification as being "on", "attached" to, "connected" to, "joined" to, or "in contact" with another component, the component may be directly located on, attached to, connected to, joined to, or in contact with the other component, or there may be an intermediate component present.

[0063] In this specification, the terms "first," "second," "third," etc., are used for ease of explanation only and are not intended to be limiting. Any technical feature represented by "first," "second," "third," etc., is interchangeable.

[0064] In the specification, spatial relation terms such as "above," "below," "front," "back," "top," and "bottom" describe the relationship between one feature and another in the accompanying drawings. It should be understood that spatial relation terms include not only the orientation shown in the drawings but also the different orientations of the device during use or operation. For example, when the device in the drawings is inverted, a feature previously described as "below" other features can now be described as "above" other features. The device can also be oriented in other ways (rotated 90 degrees or in other orientations), in which case the relative spatial relationships will be interpreted accordingly.

[0065] This disclosure relates to a seat assembly for a motor vehicle, which is movable between multiple positions to perform corresponding functions. As shown in Figures 1a and 1b, the seat assembly 1 according to this disclosure may include a seat cushion 2 and a seat back 3. The seat assembly 1 according to this disclosure may also include a linkage mechanism 150 configured to move the seat cushion 2 and the seat back 3 to realize the movement of the seat assembly 1 between multiple positions.

[0066] Unlike existing seat assemblies, as shown in FIG2b, the linkage mechanism 150 of the seat assembly 1 according to the present disclosure includes a first linkage mechanism 151 for the seat back 3 and a second linkage mechanism 152 for the seat cushion 2.

[0067] In embodiments according to this disclosure, the first linkage mechanism 151 can be configured as a "four-bar" linkage mechanism. As shown in FIG2b, the first linkage mechanism 151 may include a first linkage member 1511, a second linkage member 1512, and a third linkage member 1513. The first linkage member 1511 may include a restrained end 1511-1 and a movable end 1511-2, and the second linkage member 1512 may include a restrained end 1512-1 and a movable end 1512-2. The third linkage member 1513 may include a first foot 1513-1, a second foot 1513-2, and a third foot 1513-3. For example, the third linkage member 1513 may be configured as a triangle. However, this disclosure is not limited thereto, and the third linkage member 1513 may also be configured as a quadrilateral, a pentagon, or other polygon or shape. The constraint ends 1511-1 of the first linkage 1511 and 1512-1 of the second linkage 1512 can be pivotally mounted on the vehicle floor 5 at positions A and C, respectively (as shown in FIG. 2b), or pivotally mounted on a slide rail 6 that can slide relative to the vehicle floor to move the seat assembly 1 (as shown in FIG. 2c), or pivotally mounted on a rotating component (not shown) that can rotate relative to the vehicle floor to allow the seat assembly 1 to rotate about the vertical direction. These constraint ends 1511-1 and 1512-1 can be pivotally mounted on the vehicle floor 5, the slide rail 6, or the rotating component via an intermediate component, such as the base assembly mentioned below. The movable ends 1511-2 of the first linkage 1511 and 1512-2 of the second linkage 1512 can be pivotally connected to the first foot 1513-1 and the second foot 1513-2 of the third linkage 1513, respectively.

[0068] In this embodiment, the first linkage member 1511, the second linkage member 1512, the third linkage member 1513, and the components (vehicle floor, slide rail, or rotating component) on which the constraint end 1511-1 of the first linkage member 1511 and the constraint end 1512-1 of the second linkage member 1512 are mounted constitute a so-called "four-bar linkage" mechanism. In this embodiment, at least one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 can be driven by a first backrest drive device (e.g., a motor and / or an adjuster), such that the first linkage member 1511 and the second linkage member 1512 can pivot around a first pivot portion located at the constraint end 1511-1 of the first linkage member 1511 and a second pivot portion located at the constraint end 1512-1 of the second linkage member 1512, respectively. This causes the movable end 1511-2 of the first linkage member 1511 and the movable end 1512-2 of the second linkage member 1512 to move or swing, which in turn causes the third linkage member 1513 to move or swing. Figure 2d shows a schematic diagram of the first linkage mechanism 151 pivoting backward from the design position shown in Figure 2b to the final position under the drive of the first backrest drive device; Figure 2e shows a schematic diagram of the first linkage mechanism 151 pivoting forward from the design position shown in Figure 2b to the foremost position under the drive of the first backrest drive device.

[0069] In this embodiment, the bottom end of the seat back 3 can be pivotally connected to the third foot 1513-3 of the third linkage 1513. On the one hand, this allows the seat back 3 to move or swing in response to the movement or swinging of the third foot 1513-3 of the third linkage 1513 of the first linkage mechanism 151. On the other hand, this also allows the seat back 3 to pivot relative to the first linkage mechanism 151 (more specifically, its third linkage 1513) around a third pivot portion disposed at the third foot 1513-3 of the third linkage 1513. The pivoting of the seat back 3 relative to the first linkage mechanism 151 around the third pivot portion can be driven by a second backrest drive device (e.g., a motor and / or an adjuster). Therefore, the seat back 3 of the seat assembly 1 according to this disclosure can be referred to as a "dual-drive" seat back. In addition, when the first backrest drive device and the second backrest drive device are not working, the pivoting of the first linkage mechanism 151 around the first pivot portion and the second pivot portion and the pivoting of the seat back 3 around the third pivot portion can be locked, so that the seat back 3 cannot move.

[0070] In this embodiment, as shown in Figures 1a and 1b, the first linkage mechanism 151 may include two first linkage members 1511, two second linkage members 1512, and two third linkage members 1513, which are respectively disposed on the left and right sides of the seat assembly 1. The two first linkage members 1511 or the two second linkage members 1512 may be configured to move synchronously under the drive of the same drive device, for example, by means of two angle adjusters connected to each other, driven synchronously by a single motor.

[0071] In embodiments according to this disclosure, the second linkage mechanism 152 is configured as a "five-bar" linkage mechanism. As shown in FIG2b, the second linkage mechanism 152 may include a first linkage member 1521 (also referred to as a "rear seat linkage member", which is located at the rear of the seat cushion 2 near the seat back 3), a second linkage member 1522 (also referred to as a "front seat linkage member", which is located at the front of the seat cushion 2 away from the seat back 3), and a third linkage member 1523 (also referred to as a "zero gravity linkage member", which is used to adjust the seat assembly 1 to a zero gravity position). The first linkage member 1521 includes a restrained end 1521-1 and a movable end 1521-2, the second linkage member includes a first movable end 1522-1 and a second movable end 1522-2, and the third linkage member includes a restrained end 1523-1 and a movable end 1523-2. The constraint end 1521-1 of the first linkage 1521 and the constraint end 1523-1 of the third linkage 1523 can be pivotally mounted on the vehicle floor 5 at positions B and D as shown in FIG. 2b, respectively, or pivotally mounted on a slide rail 6 that can slide relative to the vehicle floor to move the seat assembly 1, or pivotally mounted on a rotating component that can rotate relative to the vehicle floor to rotate the seat assembly 1 about the vertical direction. The constraint ends 1521-1 and 1523-1 can be pivotally mounted on the vehicle floor 5, the slide rail 6, or the rotating component via an intermediate component, such as the base assembly mentioned below. The seat cushion 2 of seat assembly 1, at one end (also referred to as the "rear end") 21 near the seat back 3, is pivotally connected to the movable end 1521-2 of the first linkage 1521, while the other end (also referred to as the "front end") 22 away from the seat back 3 is pivotally connected to the first movable end 1522-1 of the second linkage 1522. The second movable end 1522-2 of the second linkage 1522 is pivotally connected to the movable end 1523-2 of the third linkage 1523. Thus, the first linkage 1521, the second linkage 1522, and the third linkage 1523 of the second linkage mechanism 152, the seat cushion 2, and the components (vehicle floor, slide rail, or rotating component) on which the restraint ends 1521-1 of the first linkage 1521 and 1523-1 of the third linkage 1523 are mounted constitute a so-called "five-bar" linkage mechanism.

[0072] The first linkage 1521 can pivot about a first pivot portion located at the constraint end 1521-1 under the drive of a first cushion drive device (e.g., a motor and / or an adjuster). The third linkage 1523 can pivot about a second pivot portion located at the constraint end 1523-1 under the drive of a second cushion drive device (e.g., a motor and / or an adjuster) (as shown in Figures 2b and 2c). The pivoting of the first linkage 1521 about the first pivot portion located at the constraint end 1521-1 and the pivoting of the third linkage 1523 about the second pivot portion located at the constraint end 1523-1 both enable the seat cushion 2 to move or swing accordingly, thereby moving the seat cushion 2 to the desired position. When the first cushion drive device and / or the second cushion drive device are not in operation, the pivoting of the first linkage 1521 around the first pivot portion located at the constraint end 1521-1 and / or the pivoting of the third linkage 1523 around the second pivot portion located at the constraint end 1523-1 can be locked, so that the seat cushion 2 can move with restriction or cannot move. In some cases, when the first cushion drive device is not in operation, the movable end 1521-2 of the first linkage 1521 can also be locked by the first cushion drive device, so that the seat cushion 2 cannot pivot around the movable end 1521-2 of the first linkage 1521, but the first linkage 1521 can still pivot around its pivot end 1521-1.

[0073] In embodiments according to this disclosure, as mentioned above, the third linkage 1523 is configured as a zero-gravity linkage for achieving a zero-gravity position of the seat assembly 1. However, this disclosure is not limited thereto, and the second linkage 1522 may also be configured as a zero-gravity linkage for achieving a zero-gravity position of the seat assembly 1.

[0074] Similar to the first linkage mechanism 151, the second linkage mechanism 152 may include two first linkage members 1521, two second linkage members 1522, and two third linkage members 1523, which are respectively disposed on the left and right sides of the seat assembly 1. The two first linkage members 1521, the two second linkage members 1522, or the two third linkage members 1523 can move synchronously under the drive of the same drive device, for example, by means of two angle adjusters connected to each other, driven synchronously by a single motor.

[0075] In embodiments according to this disclosure, the bottom end of the seat back 3 and the first linkage mechanism 151 for the seat back 3 are not mounted on the seat cushion 2, but rather on the vehicle floor 5, the slide rail 6, or a rotating component. Furthermore, the first linkage mechanism 151 for the seat back 3 and the second linkage mechanism 152 for the seat cushion 2 can be driven independently of each other. This configuration enables independent control of the movement of both the seat back 3 and the seat cushion 2. This independent control, combined with the aforementioned "dual drive" of the seat back 3, gives the seat assembly 1 according to this disclosure more flexible adjustment capabilities. This more flexible adjustment capability not only improves the comfort of the seat assembly 1 according to this disclosure but also expands the application scenarios of the seat assembly 1. For example, the seat assembly 1 according to this disclosure can move between a designed position (as shown in Figures 2a and 2b), a high-profile position (as shown in Figures 10a to 10c), a zero-gravity position (as shown in Figures 11a to 11c), a folded position (as shown in Figures 13a to 13c), an easy-access (EZE) position (as shown in Figures 14a to 14c), and a reclined position (as shown in Figures 15a to 15c), and the seat assembly 1 according to this disclosure can provide increased comfort in these positions compared to prior art seat assemblies, as will be described in detail below.

[0076] Next, referring to Figures 3 to 9b, the specific structure of the seat assembly 1 according to this disclosure will be described in detail.

[0077] As described above, the seat assembly 1 may include a seat cushion 2 and a seat back 3. As shown in FIG. 3, the seat back 3 may include a backrest frame 31. The backrest frame 31 may be configured to be generally rectangular and may include a first frame member 31-1 and a second frame member 31-2 arranged to the left and right relative to its central longitudinal axis L31. The two third linkage members 1513 of the first linkage mechanism 151 may be pivotally mounted at the bottom positions of the first frame member 31-1 and the second frame member 31-2 respectively via their third feet 1513-3. In some embodiments, the second backrest drive device mentioned above for driving the seat back 3 to pivot about a second pivot relative to the first linkage mechanism 151 may include a motor 32 and an adjuster 33. The motor 32 may be mounted on the backrest frame 31 by fasteners (e.g., bolts). The adjuster 33 may include a fixed member and a rotating member rotatable relative to the fixed member. The fixed component of the angle adjuster 33 can be fixedly connected (e.g., welded) to the third linkage 1513, while the rotating component of the angle adjuster 33 can be fixedly connected (e.g., welded) to a corresponding part of the backrest frame 31. Thus, when the rotating component of the angle adjuster 33 rotates relative to the fixed component, it drives the backrest frame 31 to pivot relative to the third linkage 1513. The rotation of the rotating component of the angle adjuster 33 relative to the fixed component is driven by the motor 32. In this embodiment, the third linkage 1513 can be configured as a triangular connecting plate for fixing the fixed component of the angle adjuster 33. Additionally, as shown in FIG3, the second backrest drive device can include a single motor 32 and two angle adjusters 33. The two angle adjusters 33 are respectively mounted on both sides of the backrest frame 31 for driving the backrest frame 31 to pivot from the left and right sides. To synchronously drive the two angle adjusters 33 using a single motor 32, the two angle adjusters 33 can be connected to each other using a rod 34. The motor 32 can drive the rod 34 to rotate, causing the rotating parts of the two angle adjusters 33 to rotate synchronously.

[0078] As shown in Figures 4a and 4b, the seat cushion 2 may include a seat cushion frame 21. The seat cushion frame 21 may be configured in a generally rectangular shape and may include two side connectors (e.g., side panels) 21-1 located on the left and right sides, a front connector 21-2 (e.g., a front crossbar or front tube) for connecting the two side connectors at the front, and a rear connector 21-3 (e.g., a rear crossbar) for connecting the two side connectors at the rear. The seat cushion frame 21 may also include a seat basin 21-4, which may be supported on the two side connectors 21-1 and the front connector 21-2 at the front of the two side connectors. In some embodiments, the seat frame assembly 21 may also include a leg rest mounting bracket 21-5 for mounting a leg rest 4 (as shown in Figure 11b).

[0079] The first linkage member (or rear linkage member of the seat cushion) 1521 of the second linkage mechanism 152 mentioned above can be mounted on the rear of the two side connectors 21-1 on the left and right sides of the seat cushion frame 21. The seat cushion 2 may include a first seat cushion drive device for driving the first linkage member 1521 to pivot around the first pivot portion. As shown in FIG4b, the first seat cushion drive device may include a motor 21-6 and an adjuster 21-7. In order to install the motor 21-6, a seat cushion motor mounting bracket 21-8 may be provided on the inner side of one of the side connectors 21-1 of the seat cushion frame 21. The motor 21-6 can be mounted on the seat cushion motor mounting bracket 21-8 by fasteners (e.g., bolts). The adjuster 21-7 may have a construction that is substantially the same as that of the adjuster 33, and its rotating part can be mounted to drive the first linkage member 1521 to pivot around the first pivot portion.

[0080] Specifically, the first seat cushion drive device may include a single motor 21-6 and two adjusters 21-7. The two adjusters 21-7 are respectively mounted on both sides of the seat cushion frame 21, for driving the two first linkage members 1521 of the second linkage mechanism 152 to pivot. To synchronously drive the two adjusters 21-7 using the single motor 21-6, the two adjusters 21-7 can be connected to each other using a lever 21-9. The motor 21-6 can drive the lever 21-9 to rotate, causing the rotating parts of the two adjusters 21-7 to rotate synchronously.

[0081] Referring to Figures 5a and 5b, the second linkage member (or seat cushion front linkage member) 1522 of the second linkage mechanism 152 can be pivotally mounted on the front of the seat cushion frame 21. As shown in Figure 5b, the second linkage mechanism 152 may include two second linkage members 1522, which can be connected together via a connector (e.g., a cross tube or crossbar) 1522-3. The first movable ends 1522-1 of the two linkage members 1522 and the connector 1522-3 can be welded together to form an integral second linkage member assembly. The second linkage member assembly can be pivotally connected to the front of the seat cushion frame 21 via both ends of the connector 1522-3 using bushings (e.g., plastic bushings).

[0082] Referring to Figures 6a and 6b, the seat assembly 1 may further include a base assembly 7. The base assembly 7 may include two base fixing plates 701 spaced apart from each other, two lifting brackets 702 spaced apart from each other, and a reinforcing member (e.g., a reinforcing cross tube) 703 located between the two lifting brackets 702. The two base fixing plates 701, the two lifting brackets 702, and the reinforcing member 703 of the base assembly 7 may be welded together to form the base assembly 7.

[0083] A first linkage member 1511 and a second linkage member 1512 for the first linkage mechanism 151 of the seat backrest 3, and a first backrest drive device for driving at least one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 to pivot, can be mounted on the base assembly 7. Specifically, the first linkage member 1511 of the first linkage mechanism 151 can be pivotally riveted to the base fixing plate 701 by rivets and bushings, while the second linkage member 1512 (more specifically, its restraining end) can be pivotally connected to the base fixing plate 701 by bolts (e.g., stepped bolts) through an arcuate groove 7011 provided on the base fixing plate 701, wherein the two ends of the arcuate groove 7011 are used to limit the pivoting or swinging angle of the second linkage member 1512. The first backrest drive device may include a motor 35 and an adjuster 36. The adjuster 36 may have the same construction as the adjuster 33, and may include a fixed part and a rotating part that can rotate relative to the fixed part. The fixed component of the adjuster 36 can be welded, for example, to the rear of the base assembly 7, while the rotating component of the adjuster 36 can be welded, for example, to the first linkage member 1511 or the second linkage member 1512 of the first linkage mechanism 151, so that when the rotating component of the adjuster 36 rotates relative to its fixed component, one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 pivots. The rotation of one of the first linkage member 1511 and the second linkage member 1512 further drives the other of the first linkage member 1511 and the second linkage member 1512, as well as the third linkage member 1513, to move or pivot, thereby moving the seat back 3. The motor 35 of the first backrest drive device can be bolted to the vehicle floor 5 or the slide rail 6. Similar to the second backrest drive device, as shown in FIG. 6b, the first backrest drive device may include a single motor 35 and two adjusters 36. Two angle adjusters 36 are respectively installed on both sides of the base assembly 7 for driving one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 to pivot from the left and right sides.

[0084] In the embodiments shown in Figures 6a and 6b, the base assembly 7 is mounted on the slide rail 6 using fasteners (e.g., bolts). The slide rail 6 can move linearly under the drive of a slide rail drive device (e.g., a slide rail motor) 8. The slide rail drive device 8 can be installed in any suitable position.

[0085] Referring to Figures 7a and 7b, a base assembly with a zero-gravity linkage is shown. As shown in Figure 7b, the constraint end 1523-1 of the third linkage 1523 (i.e., the zero-gravity linkage) of the second linkage mechanism 152 can be pivotally mounted (e.g., riveted) to the base assembly 7. The second linkage mechanism 152 may include two third linkages 1523 spaced apart from each other, which can be connected together via a connector (e.g., a cross tube or crossbar) 1523-3. The constraint ends 1523-1 of the two linkages 1523 and the connector 1523-3 can be welded together to form an integral third linkage assembly. The third linkage assembly may include a zero-gravity motor mounting bracket 1523-4 for mounting the zero-gravity drive device (i.e., the aforementioned second cushion drive device, which may include a zero-gravity motor) 9, which may be disposed at one end of the connector 1523-3. The zero-gravity drive device 9 may consist only of a zero-gravity motor. In some embodiments, as shown in Figures 8a and 8b, the zero-gravity drive device 9 may include an angle adjuster 1523-5. The third linkage 1523 of the second linkage mechanism 152 (i.e., the zero-gravity linkage) may be driven by the angle adjuster 1523-5.

[0086] Figure 9a shows the connection between the seat cushion frame 21 shown in Figure 5a and the base assembly 7 shown in Figure 7a. The restraint end 1521-1 of the first linkage member 1521 of the second linkage mechanism 152 mounted on the seat cushion frame 21 can be rotatably mounted to the base assembly 7 using bolts (e.g., step bolts), and the second movable end 1522-2 of the second linkage member 1522 of the second linkage mechanism 152 can be pivotally connected to the movable end 1523-2 of the third linkage member 1523, thereby forming a seat cushion assembly (as shown in Figure 9b). The backrest frame 31 shown in Figure 3 can be mounted to the seat cushion assembly shown in Figure 9b using fasteners (e.g., bolts) to form the seat assembly 1. Specifically, the movable end 1511-2 of the first linkage member 1511 and the movable end 1512-2 of the second linkage member 1512 of the first linkage mechanism 151 mounted on the backrest frame 21 shown in FIG3, and the first foot 1513-1 and the second foot 1513-2 of the third linkage member 1513 of the first linkage mechanism 151 mounted on the seat cushion assembly shown in FIG9 can be fastened together to form the seat assembly 1.

[0087] Next, referring to Figures 10a to 15d, the movement process of the seat assembly 1 according to this disclosure from the designed position shown in Figures 2a to 2c to other positions will be described.

[0088] In the design position, as shown in Figure 2a, the seat back 3 of the seat assembly 1 is at a predetermined angle relative to the seat cushion 2 to support the occupant.

[0089] In the high-adjustment position, as shown in Figure 10a, the seat cushion 2 of the seat assembly 1 can be raised or lowered by a predetermined height relative to the designed position. As shown in Figures 10b and 10c, to move the seat assembly 1 from the designed position to the high-adjustment position, the first linkage member 1521 of the second linkage mechanism 152 can be driven by the first cushion drive device to pivot away from the seat back 3, causing the seat cushion 2 to move forward and upward, thereby raising the seat cushion 2 of the seat assembly 1; or the first linkage member 1521 of the second linkage mechanism 152 can be driven to pivot towards the seat back 3, thereby lowering the seat cushion 2 of the seat assembly 1. During this process, the zero-gravity linkage member (e.g., the second linkage member 1522 or the third linkage member 1523) can be locked by the second cushion drive device, preventing the zero-gravity linkage member from moving, and only allowing the seat cushion 2 and other linkage members besides the zero-gravity linkage member to move. In addition, during or after the first linkage member 1521 of the second linkage mechanism 152 is pivoted away from the seat back 3 by the first seat cushion drive device, the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 can be pivoted toward or away from the seat cushion 2 (i.e., forward or backward) by the first backrest drive device to raise or lower the seat back 3 accordingly, and / or the second backrest drive device can be used to pivot the seat back 3 toward or away from the seat cushion 2 relative to the third linkage member 1513 of the first linkage mechanism 151 (i.e., forward or backward). This allows the seat back 3 and the seat cushion 2 to be adjusted to a predetermined position and angle relative to each other even in a high position, thereby increasing the comfort of the seat assembly 1.

[0090] In the zero-gravity position, as shown in Figure 11a, the seat assembly 1 is adjusted to a designed zero-pressure state (e.g., the seat cushion 2 and seat back 3 are adjusted to a predetermined angle and relative position, the footrest 4 of the seat cushion 2 is extended and in a predetermined position, etc.). As shown in Figures 11b and 11c, in order to move the seat assembly 1 from the designed position to the zero-gravity position, the zero-gravity linkage (the third linkage 1523 or the second linkage 1522) can be pivoted toward the seat back 3 (i.e., backward and upward) using the second seat cushion drive device. In this process, the first seat cushion drive device can be used to lock the constraint end 1521-1 of the first linkage 1521, so that the first linkage 1521 cannot move, while only the second linkage 1522, the third linkage 1523 and the seat cushion 2 can move; or the first seat cushion drive device can be used to lock the movable end 1521-2 of the first linkage 1521, so that the seat cushion 2 cannot pivot relative to the movable end 1521-2 of the first linkage 1521, but the first linkage 1521 can still pivot around its pivot end 1521-1. In addition, during the process of moving the seat assembly 1 from the designed position to the zero-gravity position, the first backrest drive device can be used to drive one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 to pivot away from the seat cushion 2 (i.e., backward), and the second backrest drive device can be used to drive the seat back 3 to pivot away from or closer to the seat cushion 2 relative to the third linkage member 1513 of the first linkage mechanism 151, until the seat back 3 is pivoted to the desired position.

[0091] In the embodiments according to this disclosure, since the first linkage mechanism 151 and the seat back 3 can pivot under the drive of the first backrest drive device and the second backrest drive device respectively (i.e., they can be adjusted independently), the seat assembly 1 according to this disclosure can overcome the defects of existing seat assemblies in zero gravity, such as lack of support for the lumbar and shoulders, thereby providing occupants with a more comfortable "zero-pressure state" experience. This will be explained in conjunction with Figures 12a to 12c.

[0092] As shown in Figures 12a and 12b, in the prior art seat assembly 1', in a zero-gravity position, the bottom 31' of the seat back 3' cannot move relative to the seat cushion in a zero-gravity position. This causes the seat back 3' to tilt so that its bottom 31' is closer to the seat cushion and its top 32' is farther away from the seat cushion (see the comparison in Figure 12a). Consequently, when an occupant sits on the seat assembly 1', the bottom 31' of the seat back 3' presses against the occupant's lower back, while the top 32' does not provide sufficient support for the occupant's shoulders or head, as shown in Figure 12b. However, the seat back 3 of this disclosure can be appropriately adjusted under the drive of the first and second backrest drive devices. Therefore, it can be adjusted to a more comfortable position that neither presses against the occupant's lower back nor does it provide support for the occupant's shoulders or head (see Figure 12c), thereby improving or enhancing the comfort of the seat assembly.

[0093] In the folded position, as shown in Figure 13a, the seat back 3 of the seat assembly 1 is substantially stacked with the seat cushion 2 to increase the space of the vehicle (e.g., cargo space). As shown in Figures 13b and 13c, to move the seat assembly 1 from its designed position to the folded position, on the one hand, the first linkage 1521 of the second linkage mechanism 152 can be pivoted away from the seat back 3 (i.e., forward and downward) using the first cushion drive device; on the other hand, the seat back 3 can be pivoted toward the seat cushion 2 using the second back drive device until it is substantially stacked with the seat cushion 2. In some cases, before folding the seat back 3, one of the first linkage 1511 and the second linkage 1512 of the first linkage mechanism 151 can be pivoted toward the seat cushion 2 (i.e., forward) using the first back drive device, thereby raising the seat back 3 to facilitate folding.

[0094] In this disclosure, the folding is more flexible because the movement of the seat cushion 2 and the seat back 3 can be controlled independently (e.g., controlled independently by a controller with a predetermined control program). In other cases, the first backrest drive device can also be used to drive one of the linkage 1511 and the second linkage 1512 of the first linkage mechanism 151 to pivot away from the seat cushion 2 (i.e., backward). This pivoting method allows the folded seat back 3 to be in a lower position, thereby freeing up more cargo space.

[0095] In the convenient access position, as shown in Figure 14a, on the one hand, the seat cushion 2 of the seat assembly 1 can pivot forward a certain distance relative to the design position; on the other hand, the seat back 3 of the seat assembly 1 can pivot towards the seat cushion 2 at a predetermined angle relative to the design position, thereby providing more space behind the seat assembly 1 to facilitate the entry and exit of the occupant. As shown in Figures 14b and 14c, in order to move the seat assembly 1 from the design position to the convenient access position, on the one hand, the first linkage member 1521 of the second linkage mechanism 152 can be driven away from the seat back 3 (i.e., forward) by the first seat cushion driving device; on the other hand, one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 can be driven to pivot towards the seat cushion 2 by the first backrest driving device, thereby causing the seat back 3 to move forward towards the seat cushion 2. In some cases, after one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 has pivoted toward the seat cushion 2 by a predetermined angle, the second backrest drive device can be used to drive the seat back 3 to continue to pivot toward the seat cushion 2 relative to the third linkage member 1513 until it pivots to the desired position.

[0096] Compared to existing seat assemblies, the seat assembly 1 according to this disclosure can provide a larger space for easy entry and exit by means of the independently controlled first linkage mechanism 151. In addition, if the first linkage mechanism 151 and the second linkage mechanism 152 of the seat assembly 1 are mounted on the slide rail 6, the entire seat assembly 1 can be driven forward by the slide rail drive device 8, thereby further increasing the space for easy entry and exit.

[0097] In the reclining position, as shown in Figure 15a, the seat back 3 of the seat assembly 1 is substantially flush with the seat cushion 2, allowing the occupant to lie down on the seat assembly 1. As shown in Figures 15b and 15c, to move the seat assembly 1 from its designed position to the reclining position, the first backrest drive device can be used to drive one of the first linkage member 1511 and the second linkage member 1512 of the first linkage mechanism 151 to pivot away from the seat cushion 2. After pivoting at a predetermined angle, the second backrest drive device can be used to drive the seat back 3 to pivot away from the seat cushion 2 relative to the third linkage member 1513 of the first linkage mechanism 151 until it is substantially flush with the seat cushion 2. Alternatively, the first cushion drive device can be used to drive the first linkage member 1521 of the second linkage mechanism 152 to pivot away from the seat back 3 (i.e., forward), so that the seat cushion 2 and the seat back 3 are substantially unfolded on the same plane or at the same height. Compared with existing seat assemblies, the seat assembly 1 according to this disclosure is more comfortable in the lying position by means of independently controlled first linkage mechanism 151 and second linkage mechanism 152, because there is basically no height difference at the joint between its seat back 3 and seat cushion 2 (as shown in Figure 15d), thus avoiding the common problem of the occupant's lower back being pressed against the seat.

[0098] Furthermore, as shown in Figures 16a and 16b, configuring the first linkage 151 as a "four-bar" linkage mechanism offers additional advantages. In particular, the first linkage 151 configured as a "four-bar" linkage mechanism is suitable for high-intensity applications (e.g., it can be used in seat backs that require high strength, including ABTS (full seat belts and seats)).

[0099] Specifically, as shown in Figure 16a, assuming the first linkage mechanism 151 is a "single-link" linkage mechanism (i.e., only including the first linkage member 1511), when a force F is applied to the seat back 3, the force F is transmitted to the movable end 1511-2 of the first linkage member 1511. At this point, the force F can be decomposed into two orthogonal components F7 and F8, where F7 is perpendicular to the first linkage member 1511. Thus, a torque M2 will be generated at the constrained end 1511-1 of the first linkage member 1511, where M2 = F7 * L1, and L1 is the length of the first linkage member 1511. In contrast, in the embodiments disclosed herein, when a force F is applied to the seat back 3, the force F is transmitted to the first foot 1513-1 and the second foot 1513-2 of the third linkage member 1513 of the first linkage mechanism 151, and is decomposed into two forces F1 and F4, where F = F1 + F4. Simultaneously, force F1 includes two mutually orthogonal components F2 and F3, where F2 is perpendicular to the second linkage member 1512; force F4 includes two mutually orthogonal components F5 and F6, where F5 is perpendicular to the first linkage member 1511. Thus, if the second linkage member 1512 is the driven member, a torque M1 will be generated at the constraint end 1512-1 of the second linkage member 1512, where torque M1 = F2 * L2, and L2 is the length of the second linkage member 1512. Since F2 is less than F and L2 is less than L1, M1 is less than M2. Alternatively, if the first linkage 1511 is a driven component, the situation is similar.

[0100] It is evident that when subjected to the same external force F, the four-bar linkage experiences a smaller torque than the single-bar linkage. In other words, compared to the single-bar linkage, the four-bar linkage can withstand greater external force or strength. Therefore, the first linkage 151 configured as a four-bar linkage according to this disclosure is more suitable for high-strength applications. In other words, by means of the first linkage 151 configured as a four-bar linkage, the seat assembly according to this disclosure also possesses superior strength performance.

[0101] Exemplary embodiments according to this disclosure have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope of this disclosure. All changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A seat assembly for a motor vehicle, characterized in that, The seat assembly includes: Base assembly; Seat cushion; Seat backrest; First backrest drive device; Second backrest drive mechanism; and A linkage mechanism configured to enable the seat assembly to move between multiple positions; The linkage mechanism includes a first linkage mechanism for the seat back and a second linkage mechanism for the seat cushion, wherein the first linkage mechanism and the second linkage mechanism are configured to be driven independently of each other. The first linkage mechanism includes a first linkage member, a second linkage member, and a third linkage member. The first linkage member includes a constrained end and a movable end. The second linkage member includes a constrained end and a movable end. The third linkage member includes a first foot, a second foot, and a third foot. The movable ends of the first and second linkage members are pivotally connected to the first and second feet of the third linkage member, respectively. The bottom end of the seat back near the seat cushion is pivotally connected to the third foot of the third linkage member. The first backrest drive device drives at least one of the first and second linkage members to pivot about a first pivot portion located at their respective constrained ends. The second backrest drive device drives the seat back to pivot about a second pivot portion located at the third foot of the third linkage member. The second linkage mechanism includes a first linkage member, a second linkage member, and a third linkage member. The first linkage member of the second linkage mechanism includes a constrained end and a movable end. The second linkage member of the second linkage mechanism includes a first movable end and a second movable end. The third linkage member of the second linkage mechanism includes a constrained end and a movable end. The end of the seat cushion near the seat back is pivotally connected to the movable end of the first linkage member of the second linkage mechanism, while the other end away from the seat back is pivotally connected to the first movable end of the second linkage member of the second linkage mechanism. The second movable end of the second linkage member of the second linkage mechanism is pivotally connected to the movable end of the third linkage member of the second linkage mechanism.

2. The seat assembly according to claim 1, characterized in that, The constraint ends of the first linkage member of the first linkage mechanism, the second linkage member of the first linkage mechanism, the first linkage member of the second linkage mechanism, and the third linkage member of the second linkage mechanism are pivotally mounted on the vehicle floor, or pivotally mounted on a slide rail that can slide relative to the vehicle floor to move the seat assembly, or pivotally mounted on a rotating component that can rotate relative to the vehicle floor to rotate the seat assembly about the vertical direction.

3. The seat assembly according to claim 1, characterized in that, One of the second linkage component and the third linkage component of the second linkage mechanism is configured as a zero-gravity linkage component for realizing the zero-gravity position of the seat assembly.

4. The seat assembly according to claim 3, characterized in that, The seat assembly further includes a first seat cushion drive device and a second seat cushion drive device. The first seat cushion drive device is used to drive the first linkage member of the second linkage mechanism to pivot around the first pivot portion disposed at the constraint end of the first linkage member of the second linkage mechanism, while the second seat cushion drive device is used to drive the zero-gravity linkage member to pivot.

5. The seat assembly according to claim 2, characterized in that, When the constraint end of the first linkage member of the first linkage mechanism, the constraint end of the second linkage member of the first linkage mechanism, the constraint end of the first linkage member of the second linkage mechanism, and the constraint end of the third linkage member of the second linkage mechanism are pivotally mounted on the slide rail, the seat assembly further includes a slide rail drive device for driving the slide rail to move linearly.

6. The seat assembly according to claim 1, characterized in that, The third linkage component of the first linkage mechanism is constructed as a connecting plate.

7. The seat assembly according to claim 6, characterized in that, The seat back includes a backrest frame, wherein the first backrest drive device and the first linkage component and the second linkage component of the first linkage mechanism are mounted on the base assembly, and the second backrest drive device and the third linkage component of the first linkage mechanism are mounted on the backrest frame of the seat back.

8. The seat assembly according to claim 7, characterized in that, Each of the first backrest drive device and the second backrest drive device includes a motor and an angle adjuster.

9. The seat assembly according to claim 4, characterized in that, The seat cushion includes a seat cushion frame, the seat cushion frame including two side connectors located on the left and right sides, a front connector for connecting the two side connectors at the front of the two side connectors, and a rear connector for connecting the two side connectors at the rear of the two side connectors. The second linkage mechanism includes two first linkage components, which are respectively installed on the left and right sides of the seat cushion frame at the rear of the two side connectors.

10. The seat assembly according to claim 9, characterized in that, The first seat cushion drive device includes a motor and an angle adjuster. One of the two side connectors has a seat cushion motor mounting bracket on its inner side for mounting the motor of the first seat cushion drive device.

11. The seat assembly according to claim 9, characterized in that, The second linkage component of the second linkage mechanism is pivotally mounted on the front of the seat cushion frame.

12. The seat assembly according to claim 4, characterized in that, The third linkage of the second linkage mechanism is configured as a zero-gravity linkage to achieve the zero-gravity position of the seat assembly, and the constraint end of the third linkage is pivotally mounted to the base assembly.

13. The seat assembly according to claim 12, characterized in that, The second linkage mechanism includes two third linkage components spaced apart from each other, and the two third linkage components of the second linkage mechanism are connected together by a connector. The second seat cushion drive device includes a zero-gravity motor, and one end of the connector for connecting the two third linkage components of the second linkage mechanism is provided with a zero-gravity motor mounting bracket for mounting the zero-gravity motor.

14. The seat assembly according to claim 4, characterized in that, The seat assembly moves between a designed position, a high-adjustment position, a zero-gravity position, a folded position, a reclining position, and a convenient access position under the drive of one or more of the first backrest drive device, the second backrest drive device, the first seat cushion drive device, and the second seat cushion drive device. In the designed position, the seat back of the seat assembly is at a predetermined angle relative to the seat cushion to support the occupant; In the high-profile position, the seat cushion of the seat assembly is raised or lowered by a predetermined height in the height direction compared to the design position; At the zero-gravity position, the seat assembly is adjusted to a designed zero-pressure state; In the folded position, the seat back of the seat assembly and the seat cushion are substantially overlapped to increase the space of the motor vehicle; In the lying position, the seat back of the seat assembly is substantially flush with the seat cushion; and In the convenient access position, the seat back of the seat assembly is pivoted at a predetermined angle toward the seat cushion relative to the design position and / or the seat cushion is moved forward a predetermined distance relative to the design position to increase the space behind the seat assembly.

15. The seat assembly according to claim 14, characterized in that, During the movement of the seat assembly from the designed position to the zero-gravity position, the first seat cushion drive device locks the first linkage member of the second linkage mechanism so that it cannot move; and during the movement of the seat assembly from the designed position to other positions besides the zero-gravity position, the second seat cushion drive device locks the zero-gravity linkage member of the second linkage mechanism so that it cannot move.

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