A vehicle projection screen device capable of free hovering

Abstract

The application discloses a vehicle projection curtain device capable of freely hovering, which comprises a motor, a shaft coupling, a lead screw, a moving nut, a moving block, a connecting block, a sliding bearing, a first supporting arm, a second supporting arm, an upper fixed sliding groove, a lower following sliding groove, an electromagnet and a travel switch; the motor is used for driving the rotation of the lead screw, the rotation of the lead screw drives the horizontal movement of the moving block and the sliding bearing, the rotary motion output by the horizontally placed motor is converted into the horizontal motion of the sliding bearing, so as to drive the first supporting arm and the second supporting arm to realize the function of staggered opening, stretching and shrinking the curtain. The application has the advantages of small noise, stable motion and self-locking by using the lead screw transmission, the cross arm structure and the electromagnet, and can realize the free hovering of the curtain at any position without unstable phenomenon caused by the motion of the vehicle. The application provides a new reference scheme based on the existing vehicle projection curtain device, and has good use value and application development prospect.

Description

Technical Field

[0001] This invention relates to the field of projection screen technology, and more specifically to a vehicle projection screen, particularly suitable for maintaining the projection screen in a stable and freely hovering position while the vehicle is in motion. Background Technology

[0002] As automotive intelligence advances, the role of cars is evolving from a simple means of transportation to an extension of living, working, and entertainment spaces. Users expect richer and higher-quality leisure and entertainment experiences while commuting and traveling long distances. As a crucial feature for enhancing the riding experience, in-vehicle projection systems are receiving increasing attention for the stability of their screens and ease of operation.

[0003] Patent document CN221650793U discloses a vehicle-mounted projection screen device, which has a roller in a roller cavity for winding the projection screen. An electric folding linkage mechanism is provided on one side of the roller cavity along the length direction. The folding end of the electric folding linkage mechanism is connected to the free end of the projection screen. The electric folding linkage mechanism controls the projection screen to be pulled out or retracted. Side guide rails are provided at both ends of the roller cavity in the opposite direction of the projection screen being pulled out. Guide grooves that cooperate with the edge of the projection screen are opened on the side guide rails. This solution can ensure that the screen does not twist or sway through the two side guide rails. However, the disadvantage is that the two side guide rails cannot be retracted, occupy a lot of space, and cannot control the screen to self-lock at any position.

[0004] Patent document CN223308533U discloses a vehicle-mounted projection screen. Its outer casing houses a motor, the motor's output shaft of which is connected to one end of a roller. One end of the screen is wound around the outside of the roller, and the other end extends out of the outer casing. One end of a folding rod is rotatably connected to the outer casing, and the folding rod has an elastic component. The two ends of the elastic component are connected to the two ends of the folding rod, with the middle of the elastic component abutting against the bend of the folding rod. The other end of the folding rod is rotatably connected to a horizontal plate, and the other end of the screen is fixedly connected to the horizontal plate. While it occupies a small volume when folded, it cannot allow the screen to be suspended in any position and cannot prevent deformation of the screen due to bumps during vehicle movement.

[0005] Patent document CN220399791U discloses a vehicle-mounted projection screen. The screen is housed within a casing, with one end extending out of the casing. A first end cap is fixedly connected to one end of the casing, and one end of a central axis is fixedly connected to the first end cap. One end of a first torsion spring is fixedly connected to the other end of the central axis. A sleeve is fitted around the outside of the central axis, and the screen wraps around the sleeve. The other end of the first torsion spring is connected to the sleeve. A limiting wheel is connected to one end of the sleeve, and the other end of the sleeve is rotatably connected to the other end of the casing. The limiting wheel is rotatably connected to the first end cap. A limiting mechanism is provided inside the first end cap, and multiple spaced limiting grooves are formed on the limiting wheel. The limiting mechanism is located near the limiting grooves. While the structure is simple, it does not restrict the screen's rising and falling positions, making it impossible to suspend the screen at any position during normal operation. Furthermore, relying solely on the weight of the screen and the crossbar to ensure the screen hangs down cannot guarantee that the screen will not deform due to bumps during vehicle movement.

[0006] Patent document CN219435209U discloses a vehicle-mounted projection screen device, specifically a built-in electric locking mechanism for the drive rod of a floor-mounted screen. The first and second drive rods are connected by a hinge mechanism, which includes an inner hinge seat and an outer hinge seat. An electromagnetic locking mechanism is provided between the inner and outer hinge seats. A push-pull electromagnet, when energized, pushes a rod into a locking groove, locking the relative angle between the inner and outer hinge seats. When de-energized, the rod disengages from the locking groove under spring force, releasing the locking of the relative angle between the inner and outer hinge seats. While its structure is simple, its hovering mechanism requires a pre-set groove for stepped adjustment, preventing the screen from freely hovering at any position. Summary of the Invention

[0007] The present invention aims to overcome the shortcomings of the prior art by providing a vehicle projection screen device that is simple in structure, more stable, and can be freely suspended.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: The vehicle projection screen device of the present invention, which can be freely suspended, is characterized by comprising: a housing having an upper fixed slide groove; a drive assembly including a motor and a lead screw, the motor and the lead screw being connected by a coupling; a moving assembly including a moving nut and a moving block, the moving nut being threadedly connected to the lead screw and the moving block being fixedly connected to the moving nut; a cross arm assembly including a first support arm and a second support arm, the first support arm and the second support arm being cross-hinged at the middle, the first end of the first support arm being hinged to the moving block, and the first end of the second support arm being slidably connected to the upper fixed slide groove; and a lower follower slide groove, which is connected to the second support arm of the first support arm. The first end and the second end of the second support arm are slidably connected; the electromagnetic locking assembly includes an electromagnet, which is fixedly mounted on the moving block, with the electromagnet's attracting end facing the second support arm, and a ferromagnetic attracting part provided on the second support arm at a position corresponding to the electromagnet; when the motor stops, the threaded pair between the lead screw and the moving nut forms a self-locking mechanism; the electromagnet attracts the second support arm to form an auxiliary lock; the electromagnet moves synchronously with the moving block, so that it can maintain a preset attracting gap with the second support arm at any unfolded position of the cross arm assembly, thereby achieving stepless hovering function without relying on preset grooves or stops.

[0009] The vehicle projection screen device of the present invention is also characterized in that sliding bearings are provided inside both the upper fixed slide groove and the lower follower slide groove; the second end of the first support arm and the second end of the second support arm are respectively slidably connected to the corresponding slide grooves through the sliding bearings; the moving block is fixedly connected to the sliding bearings through a small interference fit.

[0010] The vehicle projection screen device of the present invention is also characterized in that it further includes a limit switch, which is disposed at both ends of the travel of the lower follower slide or the upper fixed slide, and is used to trigger the motor to stop when the moving component moves to the limit position.

[0011] The vehicle projection screen device of the present invention is also characterized in that the first support arm and the second support arm are hinged by a screw, and the screw and the first support arm and the second support arm are both clearance fit.

[0012] The vehicle projection screen device of the present invention is also characterized in that the motor and the lead screw are connected by a single-membrane coupling.

[0013] The vehicle of the present invention is characterized in that it includes a vehicle body and a vehicle projection screen device of the present invention, wherein the vehicle projection screen device is installed on the roof of the vehicle body or behind the seats.

[0014] This invention converts rotational motion into linear motion by driving a lead screw with a motor, forming a helical pair between the moving nut and the lead screw. A revolute pair is formed between the first support arm and the moving block, and the moving block and the moving nut are fixed together by bolts and nuts. An interference fit is formed between the moving block and the sliding bearing, and a sliding pair is formed between the sliding bearing and the upper fixed groove and the lower following groove. This transmits the motion of the moving nut to the sliding bearing, driving the first and second support arms to move symmetrically, opening and closing the curtain. The first and second support arms form a cross-arm configuration, ensuring motion stability. A single-diaphragm coupling is used, effectively absorbing vibration and reducing noise. Using sliding bearings instead of traditional sliders offers advantages such as reduced friction, wear resistance, and long service life. A limit switch controls the motor, thereby controlling the maximum opening and minimum retraction of the curtain. The self-locking property of the lead screw drive and the assistance of the electromagnet ensure that the curtain can be freely suspended at any position.

[0015] Compared with existing technologies, the beneficial effects of this invention are reflected in: 1. This invention uses a lead screw drive, which uses a motor to drive the lead screw to rotate to provide power for the raising and lowering of the curtain. It has self-locking properties, and with the assistance of an electromagnet, the curtain can be freely suspended at any position.

[0016] 2. In this invention, the first support arm and the second support arm are connected by plug screws and nuts to form a cross arm structure, which has stability and can ensure the stability of the curtain during vehicle operation.

[0017] 3. In this invention, a single-membrane coupling is used between the motor and the lead screw, which has a significant shock absorption effect, can absorb vibration and reduce noise, and ensure the smooth operation of the curtain.

[0018] 4. In this invention, a sliding bearing is used instead of a slider, which has the functions of reducing friction and wear resistance, and has a long service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the vehicle projection screen device of the present invention; Figure 2a This is a schematic diagram of the screen opening in the vehicle projection screen device of the present invention; Figure 2b This is a schematic diagram of the screen closure in the vehicle projection screen device of the present invention; Figure 3 This is a schematic diagram of the drive module and motion conversion structure in the vehicle projection screen device of the present invention; Figure 4 This is a schematic diagram of the travel limiting structure in the vehicle projection screen device of the present invention; Figure 5 This is a schematic diagram of the electromagnet-assisted self-locking structure in the vehicle projection screen device of the present invention; The following components are labeled in the diagram: 100 Drive module, 200 Motion mode conversion module, 300 Motion execution module, 400 Brake module, 101 Motor, 102 Coupling, 103 Lead screw, 201 Moving nut, 202 Moving block, 203 Connecting block, 204 Sliding bearing, 301 First support arm, 302 Second support arm, 303 Upper fixed slide groove, 304 Lower follower slide groove, 401 Electromagnet, 402 Limit switch; Detailed Implementation

[0020] The following description, in conjunction with the accompanying drawings, provides a further illustration of a vehicle projection screen device capable of free hovering according to the present invention through embodiments.

[0021] See Figure 1 In this embodiment, the vehicle projection screen device that can be freely hovered consists of a power module 100, a motion conversion module 200, a motion execution module 300, and a braking module 400.

[0022] See Figure 1 and Figure 3 For the power module 100, the motor 101 provides power as a power source, and the power of the motor 101 is transmitted to the lead screw 103 via the coupling 102. The coupling 102 uses a single-diaphragm coupling, which can effectively reduce vibration and noise, and ensure smooth and reliable force transmission.

[0023] See Figure 1 and Figure 3 For the motion conversion module 200, a helical pair is formed between the movable nut 201 and the lead screw 103. The movable block 202 is fixed to the movable nut 201 using bolts and nuts. The connecting block 203 is fixed to the sliding bearing 204 with an interference fit, and its motion is restricted by a sliding groove: the sliding bearing 204 slides left and right in the upper fixed sliding groove 303, and the connecting block 203 and the movable block 202 are connected by a transition. The rotation of the lead screw 103 drives the movable nut 201 to move left and right, and the left and right movement of the movable nut 201 drives the sliding bearing 204 to slide left and right in the upper fixed sliding groove 303, thereby converting the axial rotation output by the motor 101 into the left and right sliding of the sliding bearing 204.

[0024] See Figure 1 and Figure 3For the motion execution module 300, the first support arm 301 and the stop screw have a clearance fit, and the second support arm 302 and the stop screw also have a clearance fit, ensuring that the first and second support arms 302 can rotate relative to each other. The stop screw and nut fit together to restrict the positions of the first and second support arms 301 and 302. Both the first and second support arms 301 and 302 have clearance fits with the connecting block 203, ensuring relative rotation is possible. When the moving nut 201 moves, the first support arm 301 moves and rotates, driving the second support arm 302 to move. Due to the constraint of the lower follower slide 304, the opening and closing of the first and second support arms 301 and 302 are achieved, ultimately realizing the opening and closing of the curtain.

[0025] See Figure 2a and Figure 2b When the movable nut 201 moves to the right, the upper end of the first support arm 301 and the lower end of the second support arm 302 both move to the right, thus closing the curtain. Figure 2b As shown; when the movable nut 201 moves to the left, the upper end of the first support arm 301 and the lower end of the second support arm 302 both move to the left, thus opening the curtain. Figure 2a As shown. To change the shape of the screen, simply change the rotation direction of motor 101.

[0026] See Figure 4 ,by Figure 4 Based on the viewing angle, when the sliding bearing 204 moves to the right, i.e., the curtain closes, the sliding bearing 204 will touch the right limit switch 402 when it moves to a certain extent. The limit switch 402 sends a signal to stop the motor 101 from working, and the curtain closing stops. When the sliding bearing 204 moves to the left, i.e., the curtain opens, the sliding bearing 204 will touch the left limit switch 402 when it moves to a certain extent. The limit switch 402 sends a signal to stop the motor 101 from working, and the curtain opening stops.

[0027] See Figure 1 and Figure 5 When the customer needs to suspend the screen at a certain position, the motor 101 stops working, and the lead screw transmission mechanism has self-locking properties; at the same time, the electromagnet 401 is attracted, and the distance between its attracting end and the ferromagnetic attracting part of the second support arm 302 is controlled within the effective attracting distance, for example, 0.5 mm to 1.5 mm, thereby providing auxiliary locking force. The two structures work together to resist the vibration and impact generated by the vehicle movement, ensuring that the screen can be stably suspended at the position required by the customer.

Claims

1. A vehicle projection screen device that can be freely hovered, characterized in that, include: The housing is provided with an upper fixed slide groove (303); the drive assembly includes a motor (101) and a lead screw (103), the motor (101) and the lead screw (103) being connected by a coupling (102); the moving assembly includes a moving nut (201) and a moving block (202), the moving nut (201) being threadedly connected to the lead screw (103), and the moving block (202) being fixedly connected to the moving nut (201); the cross arm assembly includes a first support arm (301) and a second support arm (302), the first support arm (301) and the second support arm (302) being cross-hinged at the middle, the first end of the first support arm (301) being hinged to the moving block (202), and the first end of the second support arm (302) being slidably connected to the upper fixed slide groove (303); and a lower follower slide groove (304) connected to the first support arm (301). The second end and the second end of the second support arm (302) are slidably connected respectively; the electromagnetic locking assembly includes an electromagnet (401), the electromagnet (401) is fixedly set on the moving block (202), the attracting end of the electromagnet (401) is set towards the second support arm (302), and a ferromagnetic attracting part is set on the second support arm (302) at a position corresponding to the electromagnet (401); when the motor (101) stops, the threaded pair between the lead screw (103) and the moving nut (201) forms a self-locking; the electromagnet (401) attracts the second support arm (302) to form an auxiliary lock; the electromagnet (401) moves synchronously with the moving block (202), so that it can maintain a preset attracting gap with the second support arm (302) at any unfolded position of the cross arm assembly, thereby realizing the stepless hovering function without relying on a preset groove or gear.

2. The vehicle projection screen device according to claim 1, characterized in that, Both the upper fixed slide groove (303) and the lower follower slide groove (304) are equipped with sliding bearings (204); the second end of the first support arm (301) and the second end of the second support arm (302) are slidably connected to the corresponding slide grooves through the sliding bearings (204); the moving block (202) and the sliding bearings (204) are fixedly connected by a small interference fit.

3. The vehicle projection screen device according to claim 1, characterized in that, It also includes a limit switch (402), which is disposed at both ends of the travel of the lower follower slide (304) or the upper fixed slide (303), and is used to trigger the motor (101) to stop when the moving component moves to the limit position.

4. The vehicle projection screen device according to claim 1, characterized in that, The first support arm (301) and the second support arm (302) are hinged by a screw, and the screw is clearance-fitted with both the first support arm (301) and the second support arm (302).

5. The vehicle projection screen device according to claim 1, characterized in that, The motor (101) and the lead screw (103) are connected by a single-membrane coupling (102).

Images