A power-assisted system structure for a central armrest of a rear seat of a vehicle

Abstract

The application relates to a power-assisted system structure of a central armrest of a rear seat of an automobile, which comprises a rear seat, a handrail support and a rear armrest, a rotating shaft assembly is fixedly arranged on the handrail support and connected with the rear armrest, the rear armrest rotates around the rotating shaft assembly to open or close the rear armrest; a power-assisted mechanism comprises a crank arm which is sleeved on the rotating shaft assembly and rotates at a set angle relative to the rotating shaft assembly, and a gas strut which is rotatably connected with one end of the crank arm and connected with the other end of the rear armrest; an auxiliary buffer spring is sleeved on the rotating shaft assembly, the auxiliary buffer spring is used for synchronously driving the crank arm and the gas strut to rotate, so that the rear armrest rotates around the rotating shaft assembly to the closing direction. The application can control the operating force in a proper range during the process that the rear armrest is rotated from an initial position to a terminal position by external operating force, and realizes "easy starting" and "slow stopping" of the rear armrest during the initial stage of starting opening and the last stage of returning closing.

Description

Technical Field

[0001] This application relates to the field of automotive seat technology, and in particular to a power assist system structure for the center armrest of a rear seat in an automobile. Background Technology

[0002] With the increasing prevalence of automotive intelligence, large electronic devices such as display screens and tablets are gradually being integrated into the center armrests of rear seats. Considering ease of human-machine interaction, these electronic devices are typically installed on the upper part of the rear armrest, away from the pivot point (for easy access by passengers when the armrest is rotated and folded down), thus resulting in a large moment of inertia.

[0003] When the rear armrest rotates and falls down around its pivot point, the work done by gravity torque causes a huge impact on the seat or limiting structure upon falling, which can lead to abnormal noises, damage to the limiting structure or electronic products. Furthermore, the pushing force required for the rear armrest to return to its original position may exceed the comfort range of force required for occupants to operate the rear armrest while seated, and it is generally desirable for the rear armrest to return to its original position slowly.

[0004] Because the turning angle of the rear armrest is usually large (exceeding 90°, generally 90°-120°), the motion envelope of the limiting structure also occupies a large space. To avoid dead points (the two ends of the gas strut being on the same line as the pivot) or excessive mechanical balance angles of the rear armrest (excessive angle with the horizontal plane) or excessive return torque of the rear armrest, the gas strut is arranged so that the angle formed by its moving end, fixed end, and armrest pivot is as close to 90° as possible. Often, due to the presence of the limiting structure, it is structurally difficult to meet the requirements for the fixed end arrangement. Summary of the Invention

[0005] This application provides a power assist system structure for the center armrest of a rear seat in a car, in order to solve the problem of difficult arrangement of gas struts in related technologies due to the large turning angle of the rear armrest.

[0006] This application provides a power assist system structure for the center armrest of a rear seat in a car, including:

[0007] The rear seat includes an armrest bracket and a rear armrest. The armrest bracket is fixedly provided with a pivot assembly that is rotatably connected to the rear armrest. The rear armrest rotates around the pivot assembly to open or close the rear armrest.

[0008] The power assist mechanism includes a crank arm with one end sleeved on the rotating shaft assembly and rotating at a set angle relative to the rotating shaft assembly, and a gas strut with one end rotatably connected to the crank arm and the other end rotatably connected to the rear armrest.

[0009] An auxiliary buffer spring is fitted onto the pivot assembly. The auxiliary buffer spring is used to synchronously drive the crank arm and the gas strut to rotate, so that the rear armrest rotates around the pivot assembly in the closing direction.

[0010] In some embodiments: the pivot assembly includes a pivot body with a non-circular cross-section, and one end of the crank arm is provided with a fan-shaped through hole for passing through the pivot body. The pivot body rotates relative to the crank arm at a set angle within the fan-shaped through hole.

[0011] In some embodiments: the other end of the crank arm extends away from the pivot assembly and is fixedly provided with a pin, the movable end of the gas strut is rotatably connected to the pin, and the fixed end of the gas strut is rotatably connected to the rear armrest.

[0012] In some embodiments: the gas strut includes a cylinder and a telescopic rod that moves telescopically within the cylinder. The cylinder is higher than the end of the telescopic rod. The end of the telescopic rod away from the cylinder is a movable end and is provided with a hinge joint that is rotatably connected to the pin.

[0013] The end of the cylinder away from the telescopic rod is a fixed end and is provided with a ball head screw that is rotatably connected to the rear armrest. The pin is provided with a sleeve located inside the hinge joint and a retaining ring that axially positions the hinge joint on the pin.

[0014] In some embodiments: a mounting bushing located in the fan-shaped through hole is sleeved on the rotating shaft body, and the mounting bushing is circumferentially fixed on the rotating shaft body;

[0015] The crank arm is made of steel plate of a set thickness, and the mounting bushing includes annular baffles on both sides of the crank arm and a sleeve connecting the two annular baffles.

[0016] In some embodiments: the auxiliary buffer spring is a torsion spring, a spring fixing bracket is fixedly provided on the rotating shaft body, one end of the auxiliary buffer spring is connected to the spring fixing bracket, and the other end of the auxiliary buffer spring is fixedly connected to the crank arm.

[0017] In some embodiments: a spring bushing and a rear armrest mounting bushing are rotatably connected to the rotating shaft body, the spring bushing being located between the auxiliary buffer spring and the rotating shaft body, and the rear armrest mounting bushing being located between the rear armrest and the rotating shaft body.

[0018] In some embodiments: the armrest support includes a left armrest support and a right armrest support located on both sides of the rear armrest, and both the left armrest support and the right armrest support are connected to the rear armrest via a pivot assembly;

[0019] A seat cushion and an armrest limiting bracket are provided between the left armrest bracket and the right armrest bracket. The seat cushion is located below the rear armrest to limit the rear armrest from rotating downwards, and the armrest limiting bracket is located behind the rear armrest to limit the rear armrest from rotating upwards.

[0020] In some embodiments, the rear armrest includes an upper armrest housing and a lower armrest housing that are mated to each other, and a hollow structure is formed between the upper armrest housing and the lower armrest housing to accommodate the power assist mechanism.

[0021] In some embodiments, a display screen is fixedly provided on the housing of the armrest.

[0022] The beneficial effects of the technical solution provided in this application include:

[0023] This application provides a power assist system structure for the center armrest of a rear seat in a car. The power assist system structure includes a rear seat, which comprises an armrest bracket and a rear armrest. A pivot assembly rotatably connects to the rear armrest is fixed on the armrest bracket. The rear armrest rotates around the pivot assembly to open or close the armrest. A power assist mechanism includes a crank arm with one end sleeved on the pivot assembly and rotating at a set angle relative to the pivot assembly, and a gas strut with one end rotatably connected to the crank arm and the other end connected to the rear armrest. An auxiliary buffer spring is sleeved on the pivot assembly. The auxiliary buffer spring synchronously drives the crank arm and the gas strut to rotate, causing the rear armrest to rotate around the pivot assembly in the closing direction.

[0024] Therefore, the power assist system structure of the rear seat center armrest of this application adopts a combination of a gas strut and an auxiliary buffer spring to form a power assist mechanism. The gas strut is the main power assist, and the auxiliary buffer spring is the auxiliary power assist. The fixed support point of the gas strut can rotate around the pivot assembly. The auxiliary buffer spring is mounted on the pivot assembly. When the rear armrest is opened, the output force of the auxiliary buffer spring is insufficient to drive the gas strut to extend or retract; this stage is the "easy start" stage of the rear armrest. When the rear armrest is closed, the output force of the auxiliary buffer spring is insufficient to drive the gas strut to extend or retract; this stage is the "slow stop" function stage of the rear armrest. This ensures that the operating force can always be controlled within a suitable range during the process of the rear armrest being rotated and lowered from its initial position to its final position by external operating force, achieving "easy start" and "slow stop" of the rear armrest in the initial opening stage and the final closing stage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0027] Figure 2 This is an exploded view of the structure of an embodiment of this application;

[0028] Figure 3 An exploded view of the structure of the mechanism used in the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of the crank arm in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure in the initial state of this application.

[0031] Figure 6 This is a schematic diagram of the structure of the gas strut in the retracted state of this application;

[0032] Figure 7 This is a schematic diagram of the structure in equilibrium according to the present application.

[0033] Figure 8 This is a schematic diagram of the structure at the end point of this application.

[0034] Figure label:

[0035] 1. Armrest bracket; 2. Rear armrest; 3. Armrest limiting bracket; 4. Seat cushion; 5. Rotary shaft assembly; 6. Crank arm; 7. Gas strut; 8. Auxiliary buffer spring; 11. Left armrest bracket; 12. Right armrest bracket; 21. Lower armrest housing; 22. Upper armrest housing; 51. Rotary shaft body; 52. Nut; 53. Rear armrest mounting bushing; 61. Sector-shaped through hole; 62. Pin; 63. Sleeve; 64. Mounting bushing; 65. Retaining ring; 71. Cylinder; 72. Telescopic rod; 73. Ball head screw; 81. Spring fixing bracket; 82. Spring bushing. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This application provides a power assist system structure for the center armrest of a rear seat in a car, which can solve the problem of difficult arrangement of gas struts caused by the excessive turning angle of the rear armrest in related technologies.

[0038] See Figures 1 to 3 As shown in the figure, this application embodiment provides a power assist system structure for the center armrest of a rear seat in a car, including:

[0039] The rear seats include an armrest bracket 1 and a rear armrest 2. The rear armrest 2 is located between the left and right rear seats, and the armrest bracket 1 is fixed to the left and right rear seats. A pivot assembly 5 is fixed on the armrest bracket 1, which rotatably connects to the rear armrest 2. The rear armrest 2 can be manually rotated around the pivot assembly 5 to open or close the rear armrest 2.

[0040] The power assist mechanism includes a crank arm 6, one end of which is fitted onto a pivot assembly 5 and rotates at a predetermined angle relative to the pivot assembly 5, and a gas strut 7, one end of which is rotatably connected to the crank arm 6 and the other end of which is rotatably connected to the rear armrest 2. The crank arm 6 and the pivot assembly 5 rotate relative to each other within a predetermined angle. When the crank arm 6 rotates to the predetermined angle relative to the pivot assembly 5, the pivot assembly 5 limits the rotation of the crank arm 6. When the pivot assembly 5 limits the rotation of the crank arm 6, the gas strut 7 causes the rear armrest 2 to rotate around the pivot assembly 5 through its own telescopic movement, thereby slowly opening or closing the rear armrest 2.

[0041] An auxiliary buffer spring 8 is fitted onto the pivot assembly 5. This auxiliary buffer spring 8 is used to synchronously drive the crank arm 6 and the gas strut 7 to rotate, so that the rear armrest 2 rotates around the pivot assembly 5 in the closing direction. The rotation angle of the rear armrest 2 usually exceeds 90°, which limits the length of the gas strut 7 and makes it difficult to arrange. When the gas strut 7 is extended to its maximum length, it cannot drive the rear armrest 2 to rotate to the closed state. At this time, the auxiliary buffer spring 8 drives the crank arm 6 and the gas strut 7 to rotate, so that the rear armrest 2 rotates to the closed state.

[0042] The power assist system of the rear seat center armrest in this embodiment of the application adopts a combination of a gas strut 7 and an auxiliary buffer spring 8 to form a power assist mechanism. The gas strut 7 is the main power assist, and the auxiliary buffer spring 8 is the auxiliary power assist. The fixed support point of the gas strut 7 can rotate around the rotating shaft assembly 5. The auxiliary buffer spring 8 is mounted on the rotating shaft assembly 5. When the rear armrest 2 is opened, the output force of the auxiliary buffer spring 8 is insufficient to drive the gas strut 7 to extend or retract; this stage is the "easy start" stage of the rear armrest 2. When the rear armrest 2 is closed, the output force of the auxiliary buffer spring 8 is insufficient to drive the gas strut 7 to extend or retract; this stage is the "slow stop" function stage of the rear armrest.

[0043] The gas strut 7 and the auxiliary buffer spring 8 combine to form an assist mechanism, which allows the operating force to be controlled within a suitable range during the process of the rear armrest 2 being rotated and tilted from the initial position to the final position by external operating force. Furthermore, it enables the rear armrest 2 to "start easily" and "stop slowly" during the initial opening stage and the final closing stage, thus solving the problem of difficult layout caused by the excessive turning angle of the rear armrest 2 due to the gas strut 7 and reducing the design and layout difficulty.

[0044] In some alternative embodiments: see Figure 3 and Figure 4 As shown in the figure, this application embodiment provides a power assist system structure for the center armrest of a rear seat in an automobile. The pivot assembly 5 of the power assist system structure includes a pivot body 51, the cross-section of which is a non-circular structure (e.g., a semi-circular structure or a rectangular structure). One end of the crank arm 6 is provided with a fan-shaped through hole 61 for inserting into the pivot body 51, and the pivot body 51 rotates relative to the crank arm 6 at a set angle within the fan-shaped through hole 61.

[0045] The rotation angle of the pivot body 51 relative to the crank arm 6 within the fan-shaped through hole 61 can be set according to the preset "easy start" comfort angle. When the passenger manually operates the rear armrest 2 to open, the torque of the manual operation needs to overcome the gravitational torque of the rear armrest 2 and the preload of the auxiliary buffer spring 8 (at this time, the gas strut 7 is not compressed), thereby rotating the rear armrest 2 in the opening direction, reducing the torque of the manual operation by the passenger, so that the passenger can maintain a comfortable range when operating the rear armrest 2 in a seated position, so that the rear armrest 2 meets the human-machine comfort requirements in the process of opening and closing, and improves the perceived quality.

[0046] The other end of the crank arm 6 extends away from the pivot assembly 5 and is vertically fixed with a pin 62. The movable end of the gas strut 7 is rotatably connected to the pin 62, and the fixed end of the gas strut 7 is rotatably connected to the rear armrest 2. The pin 62 on the crank arm 6 is away from the axis of the pivot body 51 and is arranged downward in the Z direction along the axis of the pivot body 51. The crank arm 6 is used to rotate the fixed end of the gas strut 7 around the pivot body 51 to increase the lever arm of the gas strut 7 driving the rear armrest 2 to rotate around the pivot body 51.

[0047] The gas strut 7 includes a cylinder 71 and a telescopic rod 72 that extends and retracts within the cylinder 71. The end of the telescopic rod 72 away from the cylinder 71 is a movable end and has a hinge joint that is rotatably connected to a pin 62. The end of the cylinder 71 away from the telescopic rod 72 is a fixed end and has a ball head screw 73 that is rotatably connected to the rear armrest 2. The pin 62 has a sleeve 63 located within the hinge joint and a retaining ring 65 that axially positions the hinge joint on the pin 62.

[0048] A mounting sleeve 64 is fitted onto the rotating shaft body 51 within a fan-shaped through hole 61, and the mounting sleeve 64 is circumferentially fixed to the rotating shaft body 51. The crank arm 6 is made of steel plate of a predetermined thickness. The mounting sleeve 64 includes annular baffles on both sides of the crank arm 6 and a sleeve connecting the two annular baffles. The mounting sleeve 64 facilitates the smooth rotation of the crank arm 6 on the rotating shaft body 51. A nut 52 is also threaded onto the rotating shaft body 51. The nut 52 is used to axially position the mounting sleeve 64, the crank arm 6, and the auxiliary buffer spring 8 on the rotating shaft body 51.

[0049] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a power assist system structure for the center armrest of a rear seat in an automobile. The auxiliary buffer spring 8 in this power assist system structure is preferably, but not limited to, a torsion spring. A spring fixing bracket 81 is fixedly mounted on the rotating shaft body 51. One end of the auxiliary buffer spring 8 is connected to the spring fixing bracket 81, and the other end of the auxiliary buffer spring 8 is fixedly connected to a crank arm 6. The crank arm 6 rotates at a set angle on the rotating shaft body 51 to allow the auxiliary buffer spring 8 to store energy and generate a preload.

[0050] A spring bushing 82 and a rear armrest mounting bushing 53 are rotatably connected to the pivot body 51. The spring bushing 82 is located between the auxiliary buffer spring 8 and the pivot body 51, and the spring bushing 82 improves the rotational flexibility between the auxiliary buffer spring 8 and the pivot body 51. The rear armrest mounting bushing 53 is located between the rear armrest 2 and the pivot body 51, and the rear armrest mounting bushing 53 improves the rotational flexibility between the rear armrest 2 and the pivot body 51.

[0051] The armrest support 1 includes a left armrest support 11 and a right armrest support 12 located on both sides of the rear armrest 2. Both the left armrest support 11 and the right armrest support 12 are connected to the rear armrest 2 via a pivot assembly 5. A seat cushion 4 and an armrest limiting bracket 3 are provided between the left armrest support 11 and the right armrest support 12. The seat cushion 4 is located below the rear armrest 2 to limit the downward rotation of the rear armrest 2, and the armrest limiting bracket 3 is located behind the rear armrest 2 to limit the upward rotation of the rear armrest 2.

[0052] The rear armrest 2 includes an upper armrest housing 22 and a lower armrest housing 21 that fit together, forming a hollow structure to accommodate the power assist mechanism. A display screen is fixedly mounted on the upper armrest housing 22.

[0053] The rear armrest 2 in this embodiment of the application is divided into four states and three stages from the initial state to the final state: initial state, auxiliary buffer spring action stage, gas strut start working state, gas strut torque provided by compression is greater than gravity torque stage, equilibrium state, slow stop stage, and final state.

[0054] in:

[0055] The initial state is: see Figure 5 As shown, the rear armrest 2 is pressed against the seat back by the torque of the auxiliary buffer spring 8 and the gravitational torque of the rear armrest 2, making the rear armrest 2 flush with the seat back and in the closed state. At this time, the gas strut 7 is in its longest extension state, and the auxiliary buffer spring 8 is in its minimum preload torque state.

[0056] The auxiliary buffer spring 8 operates during the stage where the rear armrest 2 overcomes the preload torque of the auxiliary buffer spring 8 and the gravitational torque of the rear armrest 2 under the action of the passenger's manual operation. At this time, the torque of the auxiliary buffer spring 8 is insufficient to compress the gas strut 7, and the gas strut 7 is in its longest extended state. The gas strut 7 drives the crank arm 6 and the rear armrest to rotate together around the pivot assembly 5, and the pin 62 on the crank arm 6 drives the auxiliary buffer spring 8 to be further preloaded and compressed.

[0057] Gas strut in operation state: See Figure 6 As shown, when the crank arm 6 reaches the rotatable angle value, the crank arm 6 is restricted from rotating by the rotating shaft body 51. At this time, if the rear armrest 2 is further opened by the passenger, the gas strut 7 will be compressed to provide the buffer torque for the entire rear armrest 2, and the auxiliary buffer spring 8 will be provided as the internal torque to provide the buffering effect.

[0058] When the torque provided by the gas strut is greater than the gravitational torque: the crank arm 6 is limited by the pivot body 51, and the torque provided by the gas strut 7 is always slightly greater than the gravitational torque of the rear armrest 2. However, in the arrangement design of the gas strut 7, the curve of its torque with the opening angle intersects with the curve of the gravitational torque with the opening angle.

[0059] Equilibrium state: See Figure 7 As shown, the state at the intersection of the curve of the gas strut 7 with the opening angle and the curve of the gravitational torque with the opening angle indicates that the torque of the gas strut 7 is equal to the gravitational torque.

[0060] During the easing phase: the gas strut 7 is compressed to provide a torque less than the gravitational torque. The angle involved in this phase is usually as small as possible, that is, the opening angle of the equilibrium state is usually designed to be larger.

[0061] Endpoint status: See Figure 8 As shown, the rear armrest 2 is in its maximum open state, which is the state required by the occupants.

[0062] The closing and opening processes of the rear armrest 2 are the reverse of each other. For ease of understanding, the process is briefly described as follows: When the occupant manually operates the torque to overcome the gravitational torque during the slow-stop phase and exceeds the torque of the gas strut 7, and reaches and passes the equilibrium state, the rear armrest 2 first automatically rotates in the closing direction under the torque of the gas strut 7. As the gas strut 7 reaches its maximum extension and no longer provides torque, the auxiliary buffer spring 8 starts to work to drive the rear armrest 2 (after the gas strut 7 reaches its maximum extension, it is stationary relative to the rear armrest 2 along with the crank arm 6) to rotate back to the initial closed state.

[0063] Working principle

[0064] This application provides a power assist system structure for the center armrest of a rear seat in a car. The power assist system structure for the center armrest of a rear seat in this application includes a rear seat, which comprises an armrest bracket 1 and a rear armrest 2. A pivot assembly 5 is fixedly mounted on the armrest bracket 1, rotatably connecting the rear armrest 2. The rear armrest 2 rotates around the pivot assembly 5 to open or close the rear armrest 2. The power assist mechanism includes a crank arm 6, one end of which is sleeved on the pivot assembly 5 and rotates at a set angle relative to the pivot assembly 5, and a gas strut 7, one end of which is rotatably connected to the crank arm 6 and the other end of which is connected to the rear armrest 2. An auxiliary buffer spring 8 is sleeved on the pivot assembly 5, which synchronously drives the crank arm 6 and the gas strut 7 to rotate, causing the rear armrest 2 to rotate around the pivot assembly 5 in the closing direction.

[0065] Therefore, the power assist system structure of the rear seat center armrest of this application adopts a combination of a gas strut 7 and an auxiliary buffer spring 8 to form a power assist mechanism. The gas strut 7 is the main power assist, and the auxiliary buffer spring 8 is the auxiliary power assist. The fixed support point of the gas strut 7 can rotate around the rotating shaft assembly 5, and the auxiliary buffer spring 8, mounted on the rotating shaft assembly 5, provides driving torque to the gas strut 7. The auxiliary buffer spring 8 reduces the space occupied by the gas strut 7, thus allowing more space to be allocated for covering foam / other functional components.

[0066] The power assist system structure of the rear seat center armrest of this application allows the operating force to be controlled within a suitable range throughout the process of rotating and lowering the rear armrest 2 from its initial position to its final position by an external operating force. Furthermore, it achieves "easy start" and "slow stop" of the rear armrest during the initial opening phase and the final closing phase. The power assist system structure of the rear seat center armrest of this application only requires a gas strut 7 and an auxiliary buffer spring 8, eliminating the need for high-cost components such as a motor, thus reducing the overall vehicle cost.

[0067] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0068] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A power assist system structure for the center armrest of a rear seat in a car, characterized in that, include: The rear seat includes an armrest bracket (1) and a rear armrest (2). The armrest bracket (1) is fixedly provided with a pivot assembly (5) that rotatably connects to the rear armrest (2). The rear armrest (2) rotates around the pivot assembly (5) to open or close the rear armrest (2). The assist mechanism includes a crank arm (6) with one end sleeved on the rotating shaft assembly (5) and rotating at a set angle relative to the rotating shaft assembly (5), and a gas strut (7) with one end rotatably connected to the crank arm (6) and the other end rotatably connected to the rear armrest (2). An auxiliary buffer spring (8) is fitted on the pivot assembly (5). The auxiliary buffer spring (8) is used to synchronously drive the crank arm (6) and the gas strut (7) to rotate so that the rear armrest (2) rotates around the pivot assembly (5) in the closing direction. The rotating shaft assembly (5) includes a rotating shaft body (51), the cross-section of which is a non-circular structure. One end of the crank arm (6) is provided with a fan-shaped through hole (61) for passing through the rotating shaft body (51). The rotating shaft body (51) rotates relative to the crank arm (6) at a set angle within the fan-shaped through hole (61). The auxiliary buffer spring (8) is a torsion spring. A spring fixing bracket (81) is fixedly provided on the rotating shaft body (51). One end of the auxiliary buffer spring (8) is connected to the spring fixing bracket (81), and the other end of the auxiliary buffer spring (8) is fixedly connected to the crank arm (6). The other end of the crank arm (6) extends away from the pivot assembly (5) and is fixedly provided with a pin (62). The movable end of the gas strut (7) is rotatably connected to the pin (62), and the fixed end of the gas strut (7) is rotatably connected to the rear armrest (2). The rear armrest (2) includes an upper armrest shell (22) and a lower armrest shell (21) that are mutually opposed to each other, and a hollow structure is formed between the upper armrest shell (22) and the lower armrest shell (21) to accommodate the power assist mechanism.

2. The assistive system structure for the center armrest of a rear seat in a car as described in claim 1, characterized in that: The gas strut (7) includes a cylinder (71) and a telescopic rod (72) that moves in and out of the cylinder (71). The cylinder (71) is higher than the end of the telescopic rod. The end of the telescopic rod (72) away from the cylinder (71) is a movable end and is provided with a hinge joint that is rotatably connected to the pin (62). The cylinder (71) has a fixed end away from the telescopic rod (72) and is provided with a ball head screw (73) that is rotatably connected to the rear armrest (2). The pin (62) is provided with a sleeve (63) located inside the hinge joint and a retaining ring (65) that axially positions the hinge joint on the pin (62).

3. The assistive system structure for the center armrest of a rear seat in a car as described in claim 1, characterized in that: The rotating shaft body (51) is fitted with a mounting bushing (64) located in the fan-shaped through hole (61), and the mounting bushing (64) is circumferentially fixed on the rotating shaft body (51); The crank arm (6) is made of steel plate of a set thickness, and the mounting bushing (64) includes annular baffles on both sides of the crank arm (6) and a sleeve connected between the two annular baffles.

4. The assistive system structure for the center armrest of a rear seat in a car as described in claim 1, characterized in that: A spring bushing (82) and a rear armrest mounting bushing (53) are rotatably connected on the rotating shaft body (51). The spring bushing (82) is located between the auxiliary buffer spring (8) and the rotating shaft body (51), and the rear armrest mounting bushing (53) is located between the rear armrest (2) and the rotating shaft body (51).

5. The assistive system structure for the center armrest of a rear seat in a car as described in claim 1, characterized in that: The armrest bracket (1) includes a left armrest bracket (11) and a right armrest bracket (12) located on both sides of the rear armrest (2). The left armrest bracket (11) and the right armrest bracket (12) are both connected to the rear armrest (2) through a pivot assembly (5). A seat cushion (4) and an armrest limiting bracket (3) are provided between the left armrest bracket (11) and the right armrest bracket (12). The seat cushion (4) is located below the rear armrest (2) to limit the rear armrest (2) from rotating downwards. The armrest limiting bracket (3) is located behind the rear armrest (2) to limit the rear armrest (2) from rotating upwards.

6. The assistive system structure for the center armrest of a rear seat in a car as described in claim 1, characterized in that: A display screen is fixedly installed on the upper shell (22) of the armrest.

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