Electrically controlled telescopic roof rack for a vehicle

Abstract

The utility model discloses an electric control telescopic car roof luggage rack relates to the technical field of car modification, aims at solving the problem of the existing fixed type car roof luggage rack heavy, non -automatic and the hindrance sunroof etc. The utility model discloses including left and right symmetry's L shape longitudinal beam, left and right symmetry's special-shaped folding frame and set up in the special-shaped folding frame between horizontal pole subassembly, L shape longitudinal beam outside is equipped with the buckle and is combined on the original car roof longitudinal rod, the special-shaped folding frame is four -segment type, and each section is connected with the folding leaf, and the second section and the third section are equipped with interference gap, the first section horizontal pole and second section horizontal pole bottom intermediate position all are equipped with drive assembly, and drive assembly is connected with gear through motor rotating shaft and both sides L board bearing, and motor gear all roll on L shape longitudinal beam horizontal surface rack, respectively drive frame to make telescopic movement and horizontal pole to move back and forth, the utility model discloses can be realized unfolding and folding with electric control, and after folding, avoid the sunroof, guarantee the sunroof function, be applicable to various domestic car, city SUV and off -road vehicle.

Description

Technical Field

[0001] This utility model relates to the field of automotive modification technology, and in particular to an electronically controlled telescopic car roof rack. Background Technology

[0002] With the increasing demand for multi-functional vehicles, roof racks have become an important accessory for enhancing a car's storage and cargo-carrying capacity, and are widely used in various models such as family sedans, urban SUVs, and off-road vehicles. However, existing roof racks are generally fixed structures, with their crossbars and frames rigidly connected, making it impossible to achieve electronically controlled retraction and deployment. This presents significant technical shortcomings in practical use, specifically as follows: I. The core conflict between fixed structure and sunroof function The crossbars of fixed roof racks need to remain in a pre-set position on the roof at all times. When the roof rack is not carrying any items, the crossbars continuously obstruct the upper area of ​​the sunroof. On the one hand, this obstruction directly blocks the sunroof's path to light, preventing it from allowing outside light to pass through and thus negating its basic function of improving interior lighting. On the other hand, because the crossbars are fixed above the sunroof, they severely affect the sunroof's function as a means of access between the vehicle and the outside world—whether it's for people to temporarily enter or exit the vehicle through the sunroof in special circumstances, or for passing items through the sunroof, both will be restricted or even impossible due to the obstruction of the crossbars.

[0003] II. The manual adjustable luggage rack lacks ease of operation. To reduce the drawbacks of fixed structures, some existing technologies have introduced manually adjustable luggage racks (such as buckle-connected crossbars and manually sliding frames). However, such solutions still have obvious operational drawbacks: the adjustment process requires manual operation. First, the locking mechanisms at both ends of the crossbar must be unlocked, and then the crossbar must be moved manually and the frame must be pushed manually. The operation is cumbersome and time-consuming, and there is a risk of people getting their hands caught or bumping into things.

[0004] In summary, existing fixed car roof racks, due to their inability to be electrically retracted and extended, severely affect the sunroof's lighting and access functions when not carrying items, and there is a lack of an effective technical solution to this problem. The market urgently needs a car roof rack that can be electrically retracted or extended automatically to fill the existing technological gap and meet the actual needs of users. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model aims to solve the problems of fixed luggage racks blocking the skylight, affecting lighting and access functions, and the cumbersome operation caused by manually adjusting the luggage rack.

[0006] This utility model is achieved through the following technical solution: an electronically controlled telescopic car roof rack, characterized in that: it includes L-shaped longitudinal beams symmetrically arranged on the left and right sides, an irregularly shaped folding frame placed on the L-shaped longitudinal beams, and a crossbar assembly that moves back and forth between the irregularly shaped folding frames; The L-shaped longitudinal beam is fixedly equipped with buckles at the front and rear positions on its outer side for locking and fixing to the original vehicle roof longitudinal bar. The structure of the L-shaped longitudinal beam consists of an L-shaped longitudinal beam elevation and an L-shaped longitudinal beam transverse surface; a longitudinal boss for placing an irregularly shaped folding frame is fixedly provided on the L-shaped longitudinal beam transverse surface; The crossbar assembly includes several crossbars arranged from front to back and a telescopic link hinged between the crossbars; a drive assembly for driving the crossbars to move back and forth is provided at the lower part of the front first section crossbar and the front second section crossbar on the front side. The irregular folding frame is composed of four frame units, each connected by a hinge; the second and third frame units are provided with notches to prevent interference when the frame units are folded. The two ends of the first crossbar on the front side are respectively hinged to the first frame unit on the front side by optical axis bolts; The two ends of the rear tail section crossbar are respectively hinged to the rear first section frame unit frame by optical axis bolts; The first rear frame unit is fixed to the L-shaped longitudinal beam by fastening bolts.

[0007] Furthermore, L-shaped limiting plates are symmetrically arranged on both sides of the bottom of the first and second front crossbars; each L-shaped limiting plate consists of an L-shaped limiting plate facade and an L-shaped limiting plate transverse surface; an L-shaped limiting plate bearing is fixedly installed inside the L-shaped limiting plate facade; the L-shaped limiting plate facade and the L-shaped limiting plate transverse surface are bent outward at 90 degrees; the L-shaped limiting plates on both sides and the L-shaped longitudinal beams on both sides are oriented in opposite directions, and the transverse surfaces of the L-shaped longitudinal beams and the transverse surfaces of the L-shaped limiting plates are staggered vertically, with the transverse surface of the L-shaped longitudinal beams on top and the transverse surface of the L-shaped limiting plates on the bottom; its function is to prevent the frame from moving vertically and achieve the purpose of limiting movement.

[0008] Furthermore, the drive assembly includes a dual-axis motor fixedly connected to the bottom of the crossbar, a rotating shaft shafted to the dual-axis motor, a traveling gear connected to the rotating shaft via an L-shaped limiting plate bearing, and a rack fixedly mounted on the transverse surface of the L-shaped longitudinal beam that meshes with the traveling gear; the traveling gear meshes and rolls on the rack on the transverse surface of the L-shaped longitudinal beam; the drive assembly configurations of the first and second front crossbar sections are identical, driving the crossbars to move back and forth; the first front crossbar section is connected to the irregular folding frame, driving the irregular folding frame to fold and unfold; the second front crossbar section uses a telescopic connecting rod to drive several crossbars in the crossbar assembly to move back and forth in a retracting and unfolding motion. The motor in the drive assembly is powered by a vehicle battery connected to a power cable, and a remote control and relay controller control the precise travel distance of the motor's traveling gear.

[0009] Furthermore, the frame unit consists of an inverted U-shaped frame and a frame support plate fixedly connected to the bottom of the inverted U-shaped frame; the crossbars set between the two inverted U-shaped frames, constrained by the inverted U-shaped frames, prevent the crossbars from jumping up and down during movement. The connecting rods between the crossbars restrict the crossbars from moving left and right during movement, ensuring that the crossbars always move in a straight line; the bottom of the frame support plate rests on a longitudinal boss, and the function of the frame support plate is to bear the load.

[0010] Furthermore, through holes for the optical axis bolts are provided on the front first crossbar and the rear tail crossbar.

[0011] Furthermore, the telescopic link is a two-link system composed of two hinged links; a link angle limiting block is fixedly installed on one of the links to limit the unfolding angle of the two-link system; except for the first section of the front crossbar, the other crossbars are connected to each other by telescopic links, and the telescopic links are symmetrically arranged on both sides of the crossbars, the function of which is to pull the crossbars to a preset position.

[0012] Furthermore, the hinge between the second and third frame units is a torsion hinge. The purpose of the torsion hinge is to deflect the angle, creating favorable conditions for subsequent frame folding.

[0013] The beneficial effects and features of this utility model are as follows: To resolve the conflict between sunroof functions and ensure functional integrity: the roof rack is automatically retracted and extended via electronic control; when not carrying cargo, the drive component can fold the irregularly shaped folding frame backward and retract the crossbar component, so that the overall structure is retracted to the rear of the roof, completely avoiding the sunroof area, ensuring normal lighting through the sunroof, restoring the sunroof's emergency escape and cargo transfer functions; it also takes into account both the storage needs of the roof rack and the use of the sunroof.

[0014] Improved ease of operation and reduced labor costs: The electric control system, which combines a dual-axis motor with a remote control, eliminates the need for manual operation by climbing onto the roof. The luggage rack can be extended or retracted simply by pressing buttons on the remote control. The operation process does not require manual unlocking, carrying, or folding assistance, which greatly shortens the operation time. At the same time, it avoids the risks of bumps, pinching, and falling caused by manual operation, reduces the user's workload, and improves the efficiency of use.

[0015] Enhanced adaptability and stability, ensuring safe use: The buckle design on the outer side of the L-shaped longitudinal beam can accommodate roof longitudinal bars of different cross-sections; the horizontal surfaces of the L-shaped longitudinal beam and the L-shaped limiting plate are correspondingly set and staggered vertically to prevent the horizontal bars from jumping up and down; the connecting rod angle limiting block limits the spacing between the horizontal bars and prevents lateral movement; the dual-axis worm gear motor self-locking function prevents front and rear displacement; the multi-structure collaboration improves the adaptability and stability of the roof rack, avoiding problems such as abnormal noise, swaying, and displacement during driving, ensuring driving safety and the service life of the roof rack. Attached Figure Description

[0016] Figure 1 This is a top perspective view of the unfolded state of this utility model; Figure 2 This is a bottom perspective view of the present invention in its unfolded state; Figure 3 This is a top view of the folded state of this utility model; Figure 4 This is a three-dimensional schematic diagram of the present invention in its folded state; Figure 5 This is a front view schematic diagram of the present invention in its unfolded state; Figure 6 This is a schematic diagram of the telescopic linkage structure of this utility model.

[0017] The main components in the diagram are numbered as follows: 1. L-shaped longitudinal beam; 1-1. L-shaped longitudinal beam elevation; 1-2. L-shaped longitudinal beam transverse surface; 1-3. Buckle; 2. Irregular folding frame; 2-1. Frame support plate; 2-2. C-shaped frame; 2-3. Hinge; 2-4. Torque hinge; 3. L-shaped limiting plate; 3-1. L-shaped limiting plate elevation; 3-2. L-shaped limiting plate transverse surface; 3-3. L-shaped limiting plate bearing; 4. Crossbar assembly; 4-1. First front crossbar section; 4-2. Second front crossbar section; 4-3. Crossbar through hole; 4-5. Rear tail crossbar section; 5. Telescopic connecting rod; 5-1. Connecting rod angle limiting block; 6. Drive assembly; 6-1. Dual-axis motor; 6-2. Rotating shaft; 6-3. Traveling gear; 7. Longitudinal rack; 8. Optical shaft bolt; 9. Longitudinal boss; 10. Fastening bolt.

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the contents of the embodiments will be described below in conjunction with the accompanying drawings. Obviously, the embodiments and drawings described below are only one embodiment and one drawing of this utility model. For those skilled in the art, other embodiments and drawings can be derived from these embodiments and drawings without creative effort. Other embodiments and drawings obtained on this basis are all within the protection scope of this utility model. Detailed Implementation

[0019] The following combination Figures 1-6 The contents of this utility model will be described in detail through specific embodiments. Example

[0020] An electrically controlled telescopic car roof rack includes L-shaped longitudinal beams 1 symmetrically arranged on the left and right sides, irregularly shaped folding frames 2 symmetrically arranged on the L-shaped longitudinal beams 1, and a crossbar assembly 4 that moves back and forth between the irregularly shaped folding frames 2 on both sides.

[0021] The L-shaped longitudinal beam 1 is made of lightweight, high-strength aluminum alloy (such as 6061 series). It is composed of an L-shaped longitudinal beam vertical surface 1-1 and an L-shaped longitudinal beam horizontal surface 1-2, forming an L-shaped structure. The L-shaped longitudinal beam horizontal surface 1-2 is used to support the traveling gear 6-3. A rack 7 that meshes with the gear 6-3 is fixedly installed on the L-shaped longitudinal beam horizontal surface 1-2.

[0022] At the front and rear parts of the outer side of the L-shaped longitudinal beam 1-1, buckles 1-3 are fixedly installed. The L-shaped longitudinal beam 1 can be connected and fixed to the original vehicle roof longitudinal bar through the buckles 1-3. The inner ring of the buckle 1-3 is wrapped with an elastic wear-resistant rubber pad, and the nut is screwed into the bolt thread for fastening.

[0023] The irregularly shaped folding frame 2 consists of four frame units, arranged from front to back as a first, second, third, and fourth frame unit. Each frame unit includes a C-shaped frame 2-2 and a frame support plate 2-1. The C-shaped frame 2-2 is made of corrosion-resistant aluminum alloy, and its C-shaped groove structure is used to accommodate the crossbar assembly 4, ensuring that both ends of the crossbar assembly 4 can move back and forth along the groove. The frame support plate 2-1 is vertically set at the bottom of the C-shaped frame 2-2 and is used to support the irregularly shaped folding frame 2 on the longitudinal boss 9 on the transverse surface 1-2 of the L-shaped longitudinal beam. The second and third frame units have notches to prevent interference when the frame is folded. The four frame units are connected between the facades of the C-shaped frame 2-2 via hinges 2-3 and torsion hinges 2-4. The first and second frame units are connected by a standard hinge 2-3; the second and third frame units are connected by a torsion hinge 2-4; and the third and fourth frame units are connected by a standard hinge 2-3. The torsion hinge 2-4 automatically tilts the frame inwards during folding, ensuring smooth folding and preventing jamming.

[0024] The first section of the front crossbar 4-1 is hinged to the first section of the front frame unit by passing through the crossbar through hole 4-3 with the optical axis bolt 8 through the shaped frame 2-2 and the crossbar through hole 4-3. The rear tail section crossbar 4-5 is connected to the rear fourth section frame unit by means of the optical axis bolt 8, which passes through the C-shaped frame 2-2 and the crossbar through hole 4-3.

[0025] The crossbar assembly 4 consists of several crossbar sections and multiple sets of telescopic connecting rods 5. The crossbars are made of high-strength aluminum alloy, and both ends of the crossbars are embedded in the C-shaped grooves of the frame 2-2. Except for the first crossbar section 4-1 at the front and the last crossbar section 4-5 at the rear, the remaining crossbars can move back and forth within the C-shaped frame 2-2 under the action of the telescopic connecting rods 5. The telescopic connecting rods 5 are two-bar structures, with the two connecting rods hinged together by a movable pivot. The connecting rod angle limiting block 5-1 limits the unfolding angle of the two connecting rods according to actual needs, thereby flexibly limiting the unfolding distance between the crossbars so that the spacing between the crossbars can be determined according to actual needs.

[0026] On both sides of the bottom of the first and second front crossbars 4-1 and 4-2, L-shaped limiting plates 3 are symmetrically arranged, consisting of an L-shaped limiting plate vertical surface 3-1 and an L-shaped limiting plate horizontal surface 3-2. An L-shaped limiting plate bearing 3-3 is fixed inside the L-shaped limiting plate vertical surface 3-1; the L-shaped limiting plate horizontal surface 3-2 is bent outwards at a 90-degree angle. The two L-shaped limiting plates 3 and the two L-shaped longitudinal beams 1 are oriented in opposite directions, with their horizontal surfaces staggered vertically; the L-shaped longitudinal beam horizontal surface 1-2 is on top, and the L-shaped limiting plate horizontal surface 3-2 is on the bottom, with a clearance fit to prevent the frame from moving up and down, thus achieving the limiting purpose. Simultaneously, the rear frame support plate 2-1 and the rear L-shaped longitudinal beam vertical surface 1-1 are provided with corresponding bolt holes and are connected and fixed with fastening bolts 10 to prevent the irregularly shaped folding frame 2 from moving back and forth; ensuring the smooth unfolding and retraction of the irregularly shaped folding frame 2 during movement.

[0027] The drive assembly 6 is installed at the bottom center of the first crossbar 4-1 and the second crossbar 4-2 at the front. The drive assembly 6 includes a dual-axis motor 6-1, an L-shaped limiting plate bearing 3-3, a rotating shaft 6-2, and a traveling gear 6-3. The dual-axis motor 6-1 drives the rotating shaft 6-2, which rotates synchronously via the L-shaped limiting plate bearing 3-3 and the traveling gear 6-3. The rotating shaft 6-2 is connected to the L-shaped limiting plate vertical surface 3-1 via the L-shaped limiting plate bearing 3-3, and the rotating shaft 6-2 is coaxially connected to the traveling gear 6-3. The traveling gear 6-3 smoothly engages and rolls on the rack 7 on the horizontal surface 1-2 of the L-shaped longitudinal beam. All motors are stepper worm gear micro motors, powered by a vehicle battery connected via a power cable. A remote control and a relay controller control the precise travel distance of the motor gears.

[0028] With the luggage rack retracted, pressing the remote control activates the relay controller, which first engages the drive assembly 6 on the first front crossbar 4-1. Driven by the drive assembly 6, the first front crossbar 4-1 moves forward. Since the first front crossbar 4-1 is fixedly connected to the two side irregularly shaped folding frames 2, it also drives the irregularly shaped folding frames 2 forward. Under the action of the front and rear hinges 2-3 and the middle torque hinge 2-4 of the irregularly shaped folding frame 2, the frame begins to unfold. Once fully unfolded, the dual-axis motor 6-1 in the drive assembly 6 stops. The worm gear motor 6-1 has a stop-lock function; after stopping and locking, the engagement of gear 6-3 and rack 7 further prevents the irregularly shaped folding frame 2 from moving forward or backward, thus solving the problem of unfolding and stabilizing the luggage rack.

[0029] After the luggage rack unfolds, the relay controller then activates the drive assembly 6 below the second front crossbar 4-2, causing the second front crossbar 4-2 to move forward. Under the action of the connecting rod 5 between the crossbars and the connecting rod angle limiting block 5-1, several crossbars unfold and are confined to predetermined positions. Because the worm gear motor in the drive assembly 6 has a stop locking function, the second front crossbar 4-2 connected to the motor is simultaneously locked; under the interlocking action of the connecting rod 5, several crossbars arranged after the second front crossbar 4-2 are also simultaneously locked; thus solving the problem of crossbar unfolding and stability.

[0030] With the luggage rack extended, pressing the remote control to retract it activates the relay controller, which first engages the drive assembly 6 on the second front crossbar 4-2. Drive assembly 6 then moves the second front crossbar 4-2 backward. Due to the retraction of connecting rod 5, the second front crossbar 4-2 retracts without obstruction. After contacting the third crossbar, it pushes the third crossbar backward. This process continues, with the third crossbar pushing the fourth, the fourth pushing the fifth, and so on. Once each crossbar is fully retracted, the worm gear motor in drive assembly 6 stops and locks. The meshing of the traveling gear 6-3 and rack 7 limits the retracted crossbar assembly 4, thus resolving the issue of forward and backward movement after retraction.

[0031] After the crossbar is retracted, the relay controller activates the drive assembly 6 on the first front crossbar 4-1, causing it to move backward. The first front crossbar 4-1 is connected to the two irregularly shaped folding frames 2 on either side. Thus, under the combined action of the drive assembly 6 and the torque hinges 2-4, the irregularly shaped folding frames 2 smoothly begin to fold backward, thanks to the deflection angle of the torque hinges 2-4. After folding, the dual-axis motor 6-1 in the drive assembly 6 stops. Because the dual-axis motor 6-1 has a stop-lock function, the irregularly shaped folding frames 2, connected to the motor via the first front crossbar 4-1, are also locked and cannot move forward or backward. This solves the folding and stability problem of the irregularly shaped folding frames 2, and thus solves the folding and stability problem of the luggage rack.

[0032] The principle of this utility model: The L-shaped longitudinal beams 1 on both sides are installed on the longitudinal bars of the roof on both sides in a bridging manner. This allows the horizontal surfaces 1-2 of the L-shaped longitudinal beams to avoid the uncertain shape of the original roof longitudinal bars and run straight through the front and rear of the roof, acting as a unified bridge. The traveling gears 6-3 on both sides of the drive assembly 6 can roll in a straight front-to-back meshing motion on the racks 7 of the horizontal surfaces 1-2 of the L-shaped longitudinal beams without being hindered by height. The drive assembly 6 in the first section of the front crossbar 4-1 is connected to the irregular frame 2. Under the principle of rotation, bending and straight extension of the frame unit's hinges, the frame unit can fold and unfold. The drive assembly 6 in the second section of the front crossbar 4-2 is fixedly connected to the crossbar. The traveling gears 6-3 in the drive assembly roll in a straight front-to-back meshing motion on the racks 7 of the horizontal surfaces 1-2 of the L-shaped longitudinal beams, thereby driving the crossbar to fold and unfold.

[0033] The motors in drive assembly 6 are two stepper micro worm gear motors, arranged in a front-to-back sequence. Each stepper micro worm gear motor is equipped with a relay controller to control the step angle; this allows for precise control of the movement distance and starting sequence. After power failure, the motor, utilizing a self-locking principle and the action of the motor's running gear and rack, prevents the luggage rack from moving back and forth when it is unfolded or folded, thus securing the luggage rack.

[0034] How to use this utility model: The electrically controlled retractable car roof rack described in this utility model is used as follows: Expand state operations: Pressing the "Frame Unfold" button on the remote control first activates the motor in the drive assembly 6 of the first front crossbar 4-1, causing it to rotate forward. This drives the rotating shaft 6-2 and the traveling gear 6-3 connected to the rotating shaft 6-2 to rotate forward along the rack 7 on the L-shaped longitudinal beam 1-2. Under the action of the hinges 2-3 and the torsion hinges 2-4, the irregularly shaped folding frames 2 on both sides are unfolded. After the irregularly shaped folding frames 2, i.e., the luggage rack, are unfolded, the relay controller activates the motor in the drive assembly 6 of the second front crossbar 4-2, causing it to rotate forward. Following the same driving principle as the first crossbar, the drive assembly 6 moves the second front crossbar 4-2 forward. Under the action of the connecting rod 5 and the connecting rod limit stop 5-1, several crossbar sections in the crossbar assembly 4 are pulled and positioned in a predetermined location. The stepper worm gear motor has a self-locking function when it stops. After stopping, the irregular folding frame 2 and the crossbar are locked in place by the cooperation of the traveling gear 6-3 and the rack 7, so that the irregular folding frame 2 and the crossbar cannot be moved, thus realizing the unfolding and fixing of the irregular folding frame 2 and the crossbar.

[0035] Collapse state operation: Pressing the "Frame Retraction" button on the remote control first activates the motor in the drive assembly 6 on the second front crossbar 4-2, causing it to rotate in the opposite direction and move backward. Under the retraction of the telescopic link 5, the second front crossbar 4-2 moves closer to the third crossbar and pushes it backward, and so on, with the third pushing the fourth, the fourth pushing the fifth, and so on, until the motor pushes the crossbar assembly 4 to retract into place. After the crossbar assembly 4 retracts, the relay controller activates the motor in the drive assembly 6 on the first front crossbar 4-1, causing it to rotate in the opposite direction. This drives the rotating shaft 6-2 and the traveling gear 6-3 connected to the rotating shaft 6-2 to rotate backward along the rack 7 on the L-shaped longitudinal beam surface 1-2. Under the action of the hinges 2-3 and the torsion hinges 2-4, the irregularly shaped folding frames 2 on both sides are folded. The stepper worm gear motor has a self-locking function when it stops. After stopping, the irregular folding frame 2 and the crossbar are locked in the cooperation of gear 6-3 and rack 7, and cannot be displaced, thus realizing the folding and fixing of the frame and crossbar.

Claims

1. An electrically controlled retractable car roof rack, characterized in that: It includes L-shaped longitudinal beams (1) symmetrically arranged on the left and right sides, irregular folding frames (2) placed on the L-shaped longitudinal beams (1), and crossbar components (4) that move back and forth between the irregular folding frames (2). The L-shaped longitudinal beam (1) is fixedly provided with buckles (1-3) at the front and rear positions on the outer side; the structure of the L-shaped longitudinal beam consists of the L-shaped longitudinal beam elevation (1-1) and the L-shaped longitudinal beam transverse (1-2); on the L-shaped longitudinal beam transverse (1-2), a longitudinal boss (9) for placing the irregular folding frame (2) is fixedly provided. The crossbar assembly (4) includes several crossbars arranged from front to back and a telescopic link (5) hinged between the crossbars; a drive assembly (6) for driving the crossbars to move back and forth is provided at the lower part of the front first crossbar (4-1) and the front second crossbar (4-2). The irregular folding frame (2) is composed of four frame units, and each frame unit is connected by a hinge (2-3); the second and third frame units are provided with notches to prevent interference when the frame units are folded. The two ends of the first crossbar (4-1) at the front are respectively hinged to the first frame unit at the front side by optical axis bolts (8); The two ends of the rear tail section crossbar (4-5) are respectively hinged to the rear first section frame unit frame by optical shaft bolts (8); The first rear frame unit is connected and fixed to the L-shaped longitudinal beam (1) by fastening bolts (10).

2. The electrically controlled telescopic roof rack for automobiles according to claim 1, characterized in that: L-shaped limiting plates are symmetrically arranged on both sides of the bottom of the first section of the front crossbar (4-1) and the second section of the front crossbar (4-2); the L-shaped limiting plate is composed of the L-shaped limiting plate vertical surface (3-1) and the L-shaped limiting plate horizontal surface (3-2); an L-shaped limiting plate bearing (3-3) is fixedly installed inside the L-shaped limiting plate vertical surface (3-1); the L-shaped limiting plate vertical surface (3-1) and the L-shaped limiting plate horizontal surface (3-2) are bent outward at 90 degrees; the L-shaped limiting plates (3) on both sides and the L-shaped longitudinal beams (1) on both sides are oriented in the same direction, and the L-shaped longitudinal beam horizontal surface (1-2) and the L-shaped limiting plate horizontal surface (3-2) are staggered in the upper and lower positions, with the L-shaped longitudinal beam horizontal surface (1-2) on top and the L-shaped limiting plate horizontal surface (3-2) on the bottom.

3. The electrically controlled telescopic roof rack for automobiles according to claim 2, characterized in that: The drive assembly (6) includes a dual-axis motor (6-1) fixedly connected to the bottom of the crossbar, a rotating shaft (6-2) shafted to the dual-axis motor (6-1), a traveling gear (6-3) connected to the rotating shaft (6-2) through an L-shaped limiting plate bearing (3-3), and a rack (7) fixedly provided on the cross surface (1-2) of the L-shaped longitudinal beam that meshes with the traveling gear (6-3).

4. The electrically controlled telescopic roof rack for automobiles according to claim 1, characterized in that: The frame unit consists of an inverted frame (2-2) and a frame support plate (2-1) fixedly connected to the bottom of the inverted frame (2-2); the bottom of the frame support plate (2-1) is placed on a longitudinal boss (9).

5. The electrically controlled telescopic roof rack for automobiles according to claim 1, characterized in that: A crossbar through hole (4-3) for the optical axis bolt (8) to pass through is provided on the first crossbar section (4-1) at the front and the crossbar section (4-5) at the rear.

6. The electrically controlled telescopic roof rack for automobiles according to claim 1, characterized in that: The telescopic link (5) is a two-link linkage composed of two links hinged together; a link angle limiting block (5-1) is fixedly installed on one of the links to limit the extension angle of the two links.

7. The electrically controlled telescopic roof rack for automobiles according to claim 1, characterized in that: The hinge between the second and third frame units is a torsion hinge (2-4).

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