Reflecting mirror adjusting device of HUD (Head Up Display)

Abstract

The utility model provides an HUD reflector adjusting device, and relates to the technical field of head-up displays, the HUD reflector adjusting device comprises a main shell, the main shell is provided with a driving assembly and a reflector, the driving assembly comprises a worm and a guide structure, the reflector is provided with a helical gear, the reflector is in transmission connection with the worm through the helical gear, and the guide structure is arranged on the worm. The reflecting mirror is arranged in the main shell so that the reflecting mirror turns over along the main shell; the worm is arranged on the guide structure in a sleeved mode so as to eliminate the axial clearance of the worm. The scheme that the worm is meshed with the bevel gear on the reflector to enable the reflector to be in transmission is adopted, transmission is firm and reliable, meshing is stable, precision is high, a guide structure is matched, axial gaps of the worm can be eliminated, and therefore the level adjusting precision of the reflector is improved. And the structure is simple, the occupied space is small, and the method is suitable for HUD scene application.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and in particular to a reflector adjustment device for a HUD. Background Art

[0002] With the development of new energy vehicles, vehicle-mounted HUD (head-up display) has gradually developed into AR-HUD (augmented reality-head-up display) and has been widely used. New energy vehicles have more space to arrange larger AR-HUD, which can display more content and combine virtual information with actual roads, providing users with a human-computer interaction method that improves driving safety and driving pleasure.

[0003] In order to obtain more display content, a flip mirror with a larger display area is needed, which will increase the load and bring greater challenges to the driving solution. At present, the driving force for driving the flip of the vehicle-mounted HUD mirror mainly comes from the motor. In the transmission process of the motor-driven vehicle-mounted HUD mirror flipping, the meshing between large and small gears is generally used for transmission. However, there is a meshing gap between the transmission gears, which leads to low precision of the motor-driven mirror, thus affecting the display accuracy. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a reflector adjustment device for a HUD, which can provide reliable fastening, stable engagement, and high-precision transmission, thereby improving the adjustment accuracy of the HUD reflector.

[0005] In one aspect of an embodiment of the present application, a reflector adjustment device for a HUD is provided, comprising a main shell, on which a driving assembly and a reflector are disposed, the driving assembly comprising a worm and a guide structure, a helical gear is disposed on the reflector, the reflector is connected via the helical gear and the worm gear so that the reflector can be flipped along the main shell; the worm gear is sleeved on the guide structure to eliminate the axial clearance of the worm gear.

[0006] Optionally, the guide structure includes a guide sleeve, a compression spring and an auxiliary positioning sleeve which are arranged in sequence, and one end of the worm is inserted through the guide sleeve, the compression spring and the auxiliary positioning sleeve.

[0007] Optionally, the driving assembly further comprises a motor seat, two ends of the motor seat respectively form a mounting hole and a slot, and two ends of the worm are respectively arranged in the mounting hole and the slot.

[0008] Optionally, a positioning column is provided on the auxiliary positioning sleeve, and a positioning hole is correspondingly provided on the groove wall of the groove to limit the auxiliary positioning sleeve.

[0009] Optionally, the slot is a U-shaped slot, and the opening of the U-shaped slot faces the direction of the reflector.

[0010] Optionally, the driving assembly further includes a rotating shell, the motor seat is arranged in the rotating shell, and a Z-direction spring sheet is arranged between the motor seat and the rotating shell.

[0011] Optionally, the driving assembly further comprises a motor, and the motor is connected to one end of the worm sleeve on which the auxiliary positioning sleeve is mounted.

[0012] Optionally, a rotation axis is also provided on the reflector, and the reflector is connected to the main housing via the rotation axis.

[0013] Optionally, an elastic sleeve is further provided on the main shell, and the rotating shaft is connected to the main shell via the elastic sleeve.

[0014] Optionally, a reset switch is further provided on the main housing near the reflector, and the reflector touches the reset switch as an initial position for flipping the reflector.

[0015] The reflector adjustment device of the HUD provided in the embodiment of the present application has a driving assembly and a reflector on the main shell, the driving assembly includes a worm and a guide structure, a helical gear is provided on the reflector, and the reflector is connected by the helical gear and the worm to make the reflector flip along the main shell; the worm is sleeved on the guide structure to eliminate the axial clearance of the worm. The scheme of meshing the worm with the helical gear on the reflector to drive the reflector has reliable transmission, stable meshing, high precision, and cooperates with the guide structure to eliminate the axial clearance of the worm, thereby improving the adjustment accuracy of the reflector. It has a simple structure and occupies a small space, which is suitable for HUD scene applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic structural diagram of a reflector adjustment device for a HUD provided in this embodiment;

[0018] Figure 2 is an exploded schematic diagram of a reflector adjustment device of a HUD provided in this embodiment;

[0019] Figure 3 is a schematic diagram of the structure of a compression component of a reflector adjustment device for a HUD provided in this embodiment;

[0020] Figure 4 is a schematic diagram of the rotating main body structure of the HUD reflector adjustment device provided in this embodiment;

[0021] Figure 5 is a schematic diagram of the structure of a worm assembly of a reflector adjustment device of a HUD provided in this embodiment;

[0022] Figure 6 is a schematic diagram of the structure of a driving component of a reflector adjustment device of a HUD provided in this embodiment;

[0023] Figure 7 It is a schematic diagram of an exploded view of the rotating body of the HUD reflector adjustment device provided in this embodiment.

[0024] Icons: 1-reset switch; 2, 3, 7, 11, 141-screw; 4-drive assembly; 5-main housing; 6-elastic sleeve; 8-reflector; 81-bevel gear; 9-rotating housing; 10-rotating body; 12-motor; 13-compression assembly; 14-Z-direction spring; 15-worm assembly; 16-motor seat; 161-mounting hole; 162-slot; 163-positioning hole; 17-auxiliary positioning sleeve; 171-positioning column; 18-compression spring; 19-guide shaft sleeve; 20-worm. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0026] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] The automotive HUD has gradually developed from C-HUD to W-HUD and is widely used in AR-HUD, which requires the use of flip mirrors with larger display areas, but the load will increase and bring greater challenges to the driving solution. Larger mirrors bring greater tests to the anti-vibration performance, and longer virtual image distances require higher precision in mirror flipping to avoid unsatisfactory image position accuracy.

[0029] Due to the transmission process of the motor-driven vehicle-mounted HUD reflector flipping, there is a meshing gap between the gears, resulting in low precision of the motor-driven reflector; the worm is machined from metal materials, which is costly; the installation process is complicated, or the E-type retaining spring is directly installed on the worm, which can easily cause the worm to deform and reduce the transmission accuracy; the worm transmission assembly is too large, and the internal space of many HUDs is small and cannot accommodate the transmission mechanism; even many motor transmission mechanisms do not have a self-locking function.

[0030] At present, there are basically three types of motor-driven HUD reflectors on the market. Solution 1: A transmission scheme in which a small gear meshes with a large gear. Most of them use tension springs and torsion springs to eliminate the transmission gap. However, the biggest disadvantage of this structure is that it does not have a self-locking function, and this structure requires a relatively large space. Its disadvantages cause the car to shake when driving on bumpy roads because the HUD reflector has no self-locking force. Solution 2: A two-stage transmission scheme in which a worm drives a helical gear, and the helical gear drives the fan gear. The forward and reverse drive of the two-stage worm and gear transmission is prone to produce virtual positions, resulting in low transmission accuracy and high costs caused by many parts. The circlip scheme is used to install the worm, which is difficult to install. The worm transmission component is relatively large in size, and many HUDs have small internal spaces and cannot accommodate the transmission mechanism. Solution 3: A one-stage transmission scheme in which a worm drives a helical gear has a self-locking function, but the forward and reverse rotation of the worm will cause axial movement and installation difficulties. The worm is installed at one end of the motor shaft. When the worm vibrates, it will apply force to the motor shaft in the opposite direction, which may cause abnormal noise in the motor and shorten its life.

[0031] On this basis, the embodiment of the present application provides a HUD reflector adjustment device, which mainly solves the problem of the motor 12 driving the HUD reflector 8 to rotate, and provides a transmission design that is reliable, stable in engagement, high in precision and has a self-locking function, and solves the problem of inaccurate height position of the virtual image of the reflector 8 by flipping at a small angle, so that drivers of different heights and sitting postures can observe the virtual image comfortably.

[0032] For details, please refer to Figure 1 , Figure 2As shown, an embodiment of the present application provides a reflector adjustment device for a HUD, comprising: a main shell 5, a driving assembly 4 and a reflector 8 are arranged on the main shell 5, the driving assembly 4 includes a worm 20 and a guide structure, a bevel gear 81 is arranged on the reflector 8, and the reflector 8 is connected to the worm 20 through the bevel gear 81 so that the reflector 8 can be flipped along the main shell 5; the worm 20 is sleeved on the guide structure to eliminate the axial clearance of the worm 20.

[0033] like Figure 2 As shown, the reflector 8 is arranged on the main shell 5, and a rotating shaft is also arranged on the reflector 8, and the reflector 8 is connected to the main shell 5 through the rotating shaft; an elastic sleeve 6 is also arranged on the main shell 5, and the rotating shaft is connected to the main shell 5 through the elastic sleeve 6.

[0034] A driving assembly 4 is also provided on the main shell 5, and the driving assembly 4 can drive the reflector 8 to flip along the main shell 5; wherein the driving assembly 4 includes a worm 20, and a bevel gear 81 is provided on the reflector 8, and the meshing transmission of the worm gear 20 formed by the bevel gear 81 and the worm 20 can make the reflector 8 flip.

[0035] A reset switch 1 is also provided near the reflector 8 on the main housing 5 , and the reflector 8 touches the reset switch 1 as the initial position for flipping the reflector 8 .

[0036] In addition, the driving assembly 4 further includes a guide structure, and the worm 20 is sleeved on the guide structure to eliminate the axial clearance of the worm 20 .

[0037] In the prior art, the transmission mechanism of the motor 12 adopts a small gear meshing with a large gear, and does not use a torsion spring or a compression spring to eliminate the transmission gap, resulting in low accuracy of flipping and adjusting the level of the reflector 8.

[0038] However, the present application adopts the cooperation between the worm 20 and the guide structure to eliminate the axial clearance of the worm 20 and improve the level adjustment accuracy of the reflector 8.

[0039] Specifically, Figure 5 As shown, the guide structure includes a guide sleeve 19 , a compression spring 18 and an auxiliary positioning sleeve 17 which are arranged in sequence, and one end of the worm 20 is inserted through the guide sleeve 19 , the compression spring 18 and the auxiliary positioning sleeve 17 .

[0040] The present application adopts a solution in which the worm 20 meshes with the bevel gear 81 on the reflector 8 to transmit the reflector 8. The worm 20 uses a compression spring 18 on the guide sleeve 19 and the auxiliary positioning sleeve 17 to eliminate the axial clearance of the worm 20, thereby improving the adjustment accuracy of the reflector 8.

[0041] In the prior art, the worm gear will produce axial movement when the motor drives the worm gear to rotate forward and reverse. The metal spring is used to solve the axial movement of the worm gear, but the service life is short and it is easy to fail. The E-type retaining spring is used to limit the worm shaft, which is easy to deform the worm gear. The process of assembling the worm gear is complicated and the precision of the finished product is not high, which affects the adjustment precision of the HUD reflector. In addition, the existing worm gear transmission assembly is relatively large in size, and the available space inside many HUDs is small and cannot accommodate the worm gear transmission assembly. The guide structure and the worm gear 20 of the present application form a worm gear assembly 15, which has a simple structure, occupies a small space, and can eliminate the axial clearance of the worm gear 20, solving the problems of the prior art.

[0042] like Figure 2 , Figure 3 As shown, the drive assembly 4 also includes a motor base 16, and the two ends of the motor base 16 are respectively formed with a mounting hole 161 and a slot 162. For example, the slot 162 is a U-shaped slot, and the opening of the U-shaped slot is facing the direction of the reflector 8; the two ends of the worm 20 are respectively arranged in the mounting hole 161 and the slot 162.

[0043] One end of the worm 20 is directly installed in the mounting hole 161 of the motor base 16, and the other end is installed in the U-shaped groove of the motor base 16. The compression spring 18 is squeezed before the worm 20 is installed, and the compression spring 18 is released after it is installed in place. The compression spring 18 will support the worm 20, and a positioning column 171 is provided on the auxiliary positioning sleeve 17, and a positioning hole 163 is correspondingly provided on the groove wall of the slot 162. After the positioning column 171 is adapted into the mounting hole 161, it will limit the auxiliary positioning sleeve 17 in the U-shaped groove of the motor base 16, thereby solving the problem of installation difficulty or improving installation efficiency.

[0044] The compression spring 18 applies force directly to the auxiliary positioning sleeve 17 and the guide sleeve 19 to eliminate the axial clearance of the worm 20. However, the auxiliary positioning sleeve 17 and the guide sleeve 19 only slide relative to each other in the axial direction and do not rotate radially with the worm 20. The auxiliary positioning sleeve 17 and the motor seat 16 have a positioning column 171 and a positioning hole 163 to limit the rotation of the auxiliary positioning sleeve 17. The clearance on both sides of the guide sleeve 19 and the motor seat 16 is very small to limit the rotation of the guide sleeve 19. The elastic structure of the compression spring 18 only has an axial elastic effect, and the structure does not rotate. The two ends of the compression spring 18 do not rotate relatively, which greatly increases the service life of the compression spring 18 and makes the structure rotate smoothly.

[0045] One end of the existing worm is limited by the motor shaft, the worm has low precision and affects the life of the motor; in the present application, both ends of the worm 20 are limited, which improves the rotation precision of the worm 20 and is also beneficial to extending the life of the motor 12.

[0046] In addition, if Figure 4 , Figure 7As shown, the driving assembly 4 further includes a motor 12 , which is connected to one end of the worm 20 on which the auxiliary positioning sleeve 17 is sleeved.

[0047] A U-shaped groove is provided on the motor seat 16 at the end close to the motor 12. When installing the motor 12, the human eye can clearly see the shaft of the worm 20 at one end of the worm 20, which makes it very convenient to insert the shaft of the motor 12 into the shaft of the worm 20, and then achieve the transmission purpose, thereby solving the problem of blind installation difficulties due to the inability to see the shaft of the worm 20 and improving installation efficiency.

[0048] like Figure 6 , Figure 7 As shown, the driving assembly 4 further includes a rotating housing 9 , a motor seat 16 is disposed inside the rotating housing 9 , and a Z-direction spring piece 14 is disposed between the motor seat 16 and the rotating housing 9 .

[0049] The worm 20, the guide structure, the motor seat 16, and the motor 12 form a rotating body 10, which is located in the conveying shell, and the rotating shell 9 is installed on the main shell 5; a Z-direction spring piece 14 is arranged between the bottom of the motor seat 16 and the bottom wall of the rotating shell 9 to reduce the Z-direction vibration of the worm 20.

[0050] The working principle of the reflector adjustment device of the HUD provided in the embodiment of the present application is as follows: when the HUD is turned on, the motor 12 first drives the worm 20 to rotate, and then the worm 20 drives the bevel gear 81 of the reflector 8 to rotate, thereby achieving the purpose of allowing the reflector 8 to flip from the position of the reset switch 1 to the screen display position according to the set angle steps.

[0051] The installation steps are as follows: first, install the auxiliary positioning sleeve 17, the compression spring 18, and the guide sleeve 19 into the worm 20 in sequence to form a worm assembly 15; second, install the worm assembly 15 into the mounting hole 161 and the slot 162 of the motor seat 16 to form a compression assembly 13 (compress the compression spring 18 before installation, release the compression spring 18 after installation, and the compression spring 18 will support the worm 20); third, install the motor 12 into the motor seat 16 of the compression assembly 13, and then lock it with the screw 11, and install the Z-direction spring 14 into the compression assembly 13. The motor base 16 of the shrink assembly 13 is locked with a screw 141 to form a rotating body 10; the fourth step is to install the rotating body 10 into the rotating groove of the rotating shell 9 to form a driving assembly 4; the fifth step is to install the reset switch 1 into the main shell 5 and fix it with a screw 2; the reflector 8 is installed into the main shell 5, and then the rotating axis of the reflector 8 is limited by an elastic sleeve 6 and fixed with a screw 7; the sixth step is to first install the driving assembly 4 into the main shell 5, and then fix it with a screw 3, and finally achieve the purpose of meshing transmission between the worm 20 of the main shell 5 and the bevel gear 81 of the reflector 8.

[0052] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A reflector adjustment device for a HUD, characterized in that: It comprises: a main shell, on which a driving assembly and a reflector are arranged, the driving assembly comprises a worm and a guide structure, a helical gear is arranged on the reflector, the reflector is connected to the helical gear and the worm through transmission, so that the reflector can be flipped along the main shell; the worm is sleeved on the guide structure to eliminate the axial clearance of the worm.

2. The HUD reflector adjustment device according to claim 1, characterized in that: The guide structure comprises a guide sleeve, a compression spring and an auxiliary positioning sleeve which are arranged in sequence, and one end of the worm is inserted through the guide sleeve, the compression spring and the auxiliary positioning sleeve.

3. The HUD reflector adjustment device according to claim 2, characterized in that: The driving assembly also includes a motor seat, two ends of which are respectively formed with a mounting hole and a slot, and two ends of the worm are respectively arranged in the mounting hole and the slot.

4. The HUD reflector adjustment device according to claim 3, characterized in that: The auxiliary positioning sleeve is provided with a positioning column, and the groove wall of the groove is correspondingly provided with a positioning hole to limit the auxiliary positioning sleeve.

5. The HUD reflector adjustment device according to claim 4, characterized in that: The slot is a U-shaped slot, and the opening of the U-shaped slot faces the direction of the reflector.

6. The HUD reflector adjustment device according to claim 3, characterized in that: The driving assembly further comprises a rotating shell, the motor seat is arranged in the rotating shell, and a Z-direction spring sheet is arranged between the motor seat and the rotating shell.

7. The HUD reflector adjustment device according to claim 3, characterized in that: The driving assembly also includes a motor connected to one end of the worm sleeve on which the auxiliary positioning sleeve is mounted.

8. The HUD reflector adjustment device according to any one of claims 1 to 7, characterized in that: A rotation shaft is also arranged on the reflector, and the reflector is connected to the main shell via the rotation shaft.

9. The HUD reflector adjustment device according to claim 8, characterized in that: An elastic sleeve is also provided on the main shell, and the rotating shaft is connected to the main shell through the elastic sleeve.

10. The HUD reflector adjustment device according to any one of claims 1 to 7, characterized in that: The main housing is also provided with a reset switch near the reflector, and the reflector touches the reset switch as the initial position of the flipping of the reflector.

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