Head-up display and vehicle

Abstract

The invention relates to the technical field of vehicle-mounted head-up displayers, in particular to a head-up displayer and a vehicle, the head-up displayer comprises a reflecting mirror, a driven wheel, a driving wheel and a motor, the reflecting mirror is used for transmitting optical information, the driven wheel is fixed to the reflecting mirror, the driving wheel is meshed with the driven wheel, and an output shaft of the motor is connected to the driving wheel; therefore, the driven wheel and the reflecting mirror are sequentially driven to rotate. The pitch lines of the driven wheel and the driving wheel are both in an oval shape, so that the reflecting mirror is driven by the motor to rotate at a variable speed. According to the head-up display, the driven wheel and the driving wheel of which the pitch lines are oval are used for transmitting the reflecting mirror, so that the reflecting mirror has an accelerated rotation process, and the time spent in the whole rotation process can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle head-up display, in particular to a head-up display and a vehicle. BACKGROUND

[0002] The vehicle HUD (head-up display) realizes the interactive mode of "eyes not leaving the road" by projecting the key driving information (such as vehicle speed, navigation, advanced driving assistance system warning, etc.) to the driver's front field of view. The HUD usually adjusts the projection position of the key driving information by adjusting the rotation of the reflector. The existing HUD generally adopts the transmission mode of worm gear to realize the rotation of the reflector. The transmission of the worm gear is relatively gentle, so that the rotation of the reflector is relatively gentle, and a long time is needed in the whole rotation process. SUMMARY

[0003] In view of the above problems, the present application provides a head-up display and a vehicle, which overcomes the above problems or at least partially solves the above problems.

[0004] According to one aspect of the present application, a head-up display is provided, comprising a reflector, a driven wheel, a driving wheel and a motor. The reflector is used to transmit optical information. The driven wheel is fixed to the reflector. The driving wheel is engaged with the driven wheel. The output shaft of the motor is connected to the driving wheel to drive the driving wheel to rotate, thereby sequentially driving the driven wheel and the reflector to rotate. Wherein the shape of the pitch line of the driven wheel and the driving wheel is an ellipse, so that the reflector rotates at variable speed under the driving of the motor.

[0005] In some embodiments, the engagement area of the driving wheel includes a first area and a second area. When the first area is engaged with the driven wheel, the driving wheel and the driven wheel have a first transmission ratio. When the second area is engaged with the driven wheel, the driving wheel and the driven wheel have a second transmission ratio. The second transmission ratio is smaller than the first transmission ratio.

[0006] In some embodiments, the polar radius of the second area is greater than the polar radius of the first area.

[0007] In some embodiments, when the first area is engaged with the driven wheel, the driving wheel and the driven wheel have a first center distance. When the second area is engaged with the driven wheel, the driving wheel and the driven wheel have a second center distance. The second center distance is the same as the first center distance.

[0008] In some embodiments, during the transmission of the driving wheel and the driven wheel, the center distance between the driving wheel and the driven wheel remains unchanged.

[0009] In some embodiments, the number of the second area is two, and the two second areas are respectively connected to the two ends of the first area.

[0010] In some embodiments, the head-up display further comprises a housing, the mirror is provided with a first rotation shaft, the first rotation shaft is rotatably arranged on the housing, the rotation axis of the driven wheel is located on the first rotation shaft, and the motor is fixed on the housing.

[0011] In some embodiments, the head-up display further comprises a fixing seat and a second rotation shaft, the fixing seat is fixed on the housing, the motor is fixed on the fixing seat, one end of the second rotation shaft is fixed on the output shaft of the motor, the other end of the second rotation shaft is rotatably arranged on the fixing seat, and the driving wheel is fixed on the second rotation shaft.

[0012] In some embodiments, the head-up display further comprises a limiting component, the limiting component is electrically connected to the motor, the limiting component is used for identifying the position of the mirror, the meshing area of the driven wheel comprises a first edge and a second edge which are opposite in the rotation direction, and the limiting component controls the motor to stop rotating when the first edge or the second edge is meshed with the driving wheel.

[0013] According to an aspect of the present application, a vehicle is provided, comprising the head-up display described above.

[0014] The head-up display provided by the present application has the following beneficial effects: Different from the prior art, the head-up display provided by the present application comprises a mirror, a driven wheel, a driving wheel and a motor, the mirror is used for transmitting optical information, the driven wheel is fixed on the mirror, the driving wheel is meshed with the driven wheel, the output shaft of the motor is connected to the driving wheel to drive the driving wheel to rotate, and then the driven wheel and the mirror are driven to rotate in turn. The shape of the pitch line of the driven wheel and the driving wheel is an ellipse, so that variable transmission ratio transmission can be realized, the driven wheel is driven to rotate at a variable angular velocity, the mirror is driven to rotate at a variable angular velocity by the motor, the driven wheel has an acceleration rotation process, the mirror has an acceleration rotation process, and the time required in the whole rotation process can be reduced. The head-up display provided by the present application adopts the driven wheel and the driving wheel with an elliptical pitch line to drive the mirror, so that the mirror has an acceleration rotation process, and the time required in the whole rotation process can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0016] Figure 1 FIG. 1 is a perspective view of a head-up display provided by an embodiment of the present application; Figure 2 FIG. 2 is a perspective view of the head-up display provided by the embodiment of the present application from another angle. Figure 3 is a structural schematic diagram of a mirror, a driven wheel and a driving wheel provided by an embodiment of the present application; Figure 4 is a schematic diagram of the second zone of the driving wheel engaging with the driven wheel provided by an embodiment of the present application; Figure 5 is a schematic diagram of the first zone of the driving wheel engaging with the driven wheel provided by an embodiment of the present application; Figure 6 is a schematic diagram of the second zone of the driving wheel engaging with the driven wheel provided by an embodiment of the present application; Figure 7 is a transmission schematic diagram of the driving wheel when the rotation angle θ1 of the driving wheel is 0° provided by an embodiment of the present application; Figure 8 is an exploded view of a head-up display provided by an embodiment of the present application.

[0017] Reference signs in the detailed description are as follows: 100, head-up display; 1, shell; 11, upper shell; 12, lower shell; 13, bottom shell; 2, mirror; 21, first rotation shaft; 31, driven wheel; 311, first edge; 312, second edge; 32, driving wheel; 321, first zone; 322, second zone; 33, motor; 34, fixing seat; 35, second rotation shaft; 36, limiting circuit board; 37, wire harness; 4, elastic sheet; 5, lens; 6, control circuit board. Detailed description

[0018] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the present specification are only for the purpose of illustration.

[0019] Unless otherwise defined, all technical and scientific terms used in the present specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present specification and the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0020] The vehicle-mounted HUD (Head-Up Display) realizes the interactive mode of "eyes not leaving the road" by projecting the key driving information (such as the vehicle speed, navigation, advanced driving assistance system warning, etc.) to the driver's front field of view. The HUD usually adjusts the projection position of the key driving information by adjusting the rotation of the reflector. The existing HUD generally adopts the transmission mode of worm gear to realize the rotation of the reflector. The transmission of the worm gear is relatively gentle, so that the rotation of the reflector is relatively gentle, and a long time is needed to spend in the whole rotation process.

[0021] The head-up display of the present application adopts the driven wheel and the driving wheel with the elliptical shape of the pitch line to drive the reflector, so that the reflector has the acceleration rotation process, and the time needed to spend in the whole rotation process can be reduced.

[0022] In order to facilitate the reader to understand the inventive concept of the present application, the specific structure of the head-up display is described as follows: Please refer to Figures 1-3 The head-up display 100 includes the reflector 2, the driven wheel 31, the driving wheel 32 and the motor 33. The reflector 2 is used to transmit optical information, for example, the reflector 2 can refract the optical information to the windshield of the vehicle. The driven wheel 31 is fixed to the reflector 2, the driving wheel 32 is engaged with the driven wheel 31, and the output shaft of the motor 33 is connected to the driving wheel 32 to drive the driving wheel 32 to rotate, and then drive the driven wheel 31 and the reflector 2 to rotate in turn. Among them, the shape of the pitch line of the driven wheel 31 and the driving wheel 32 is elliptical, which can realize variable transmission ratio transmission, so that the driven wheel 31 realizes variable angular velocity rotation, so that the reflector 2 rotates at variable angular velocity under the driving of the motor 33. The driven wheel 31 has the acceleration rotation process, so that the reflector 2 has the acceleration rotation process, and the time needed to spend in the whole rotation process can be reduced. The head-up display 100 of the present application adopts the driven wheel 31 and the driving wheel 32 with the elliptical shape of the pitch line to drive the reflector 2, so that the reflector 2 has the acceleration rotation process, and the time needed to spend in the whole rotation process can be reduced.

[0023] In some embodiments, the driving wheel 32 and the driven wheel 31 are gear wheels.

[0024] In some embodiments, please refer to Figure 4The engagement area of the driving wheel 32 includes a first area 321 and a second area 322. When the first area 321 engages the driven wheel 31, the driving wheel 32 and the driven wheel 31 have a first transmission ratio. When the second area 322 engages the driven wheel 31, the driving wheel 32 and the driven wheel 31 have a second transmission ratio. The second transmission ratio is smaller than the first transmission ratio. According to the principle of gear transmission, the angular velocity of the driven wheel 31 is inversely proportional to the transmission ratio. Therefore, the second transmission ratio smaller than the first transmission ratio can make the rotation speed of the driven wheel 31 when the second area 322 engages greater than the rotation speed of the driven wheel 31 when the first area 321 engages, i.e., the engagement process of the second area 322 is an acceleration process of the driven wheel 31.

[0025] In some embodiments, the polar radius r2 of the second area 322 is greater than the polar radius r1 of the first area 321, so that the second transmission ratio when the second area 322 engages is smaller than the first transmission ratio when the first area 321 engages. It should be noted that the polar radius refers to the distance from the rotation axis of the gear to the engagement point.

[0026] In some embodiments, referring to Figure 5 and Figure 6 When the first area 321 engages the driven wheel 31, the driving wheel 32 and the driven wheel 31 have a first center distance d1. When the second area 322 engages the driven wheel 31, the driving wheel 32 and the driven wheel 31 have a second center distance d2. The second center distance is the same as the first center distance, which is beneficial to reduce the volatility of the engagement between the driving wheel 32 and the driven wheel 31 in the transition process between the first area 321 and the second area 322. It should be noted that the center distance of the driving wheel 32 and the driven wheel 31 refers to the distance between the rotation axis of the driving wheel 32 and the rotation axis of the driven wheel 31.

[0027] In some embodiments, during the transmission between the driving wheel 32 and the driven wheel 31, the center distance between the driving wheel 32 and the driven wheel 31 remains unchanged, which is beneficial to reduce the volatility of the driving wheel 32 and the driven wheel 31 in the entire engagement process.

[0028] In some embodiments, the number of the second area 322 is two, and the two second areas 322 are respectively connected to the two ends of the first area 321, which is beneficial to increase the acceleration rotation process of the driven wheel 31.

[0029] In some embodiments, the rotation axis of the driving wheel 32 is located at the geometric center of the driving wheel 32, and the rotation axis of the driven wheel 31 is located at the geometric center of the driven wheel 31.

[0030] Please refer to Figure 7 , Figure 7 is a transmission schematic diagram of the driving wheel 32 with an angle θ1 of 0°. In order to facilitate the reader to understand the inventive concept of the present application, the transmission principle of the driving wheel 32 and the driven wheel 31 of the present application is described: (1) Ellipse geometry: Major axis (a): the length of the longest diameter of an ellipse.

[0031] Minor axis (b): the length of the shortest diameter of an ellipse.

[0032] Eccentricity (e): a parameter describing the degree of flatness of an ellipse. e = √(1-(b² / a²)) (0 < e < 1). e = 0 is a circle, and the larger e is, the flatter the ellipse is.

[0033] Foci (F1, F2): An ellipse has two foci, located on the major axis, and the distance from the center to the foci is c = e × a.

[0034] (2) Transmission principle: The major axis of the ellipse driving wheel 32 is a1, the minor axis of the ellipse driving wheel 32 is b1, the major axis of the ellipse driven wheel 31 is a2, and the minor axis of the ellipse driven wheel 31 is b2.

[0035] Two identical ellipse gears (i.e., a1= a2 = a, b1 = b2 = b, e1 = e2 = e).

[0036] The initial angle between the major axes of the two ellipses (installation angle) is usually 90 degrees (this is the most common and can ensure continuous and smooth meshing). Assuming that the driving wheel 32 and the driven wheel 31 are two identical ellipse gears, the rotation axis of the driving wheel 32 is located at the geometric center of the driving wheel 32, and the rotation axis of the driven wheel 31 is located at the geometric center of the driven wheel 31, based on which the analysis and calculation are carried out: Determine the ellipse parameters: obtain the major axis a and the minor axis b of the driving wheel 32 / driven wheel 31.

[0037] Calculate the eccentricity: e = √(1-(b² / a²)).

[0038] Determine the position of the driving wheel 32: specify the current rotation angle θ1 of the driving wheel 32 (measured from the starting position of the major axis).

[0039] Calculate the polar radius of the driving wheel 32 (obtained according to the geometric relationship): r1 = ab / √(a 2 -c 2 cos 2 θ1)=b / √(1-e 2 cos 2 θ1) Calculate the polar radius of the driven wheel 31: r2 = ab / √(a 2 -c 2 cos 2 (θ1+π / 2))=ab / √(a 2 -c 2 sin 2θ1)=b / √(1-e 2 sin 2 θ1) Calculate the instantaneous transmission ratio: i12= r2 / r1=√(1-e 2 cos 2 θ1) / √(1-e 2 sin 2 θ1)=√((2-e 2 ) / (1-e 2 sin 2 θ1)-1). (Formula 1) The driving wheel 32 is given an input angular velocity: the driving wheel 32 is assigned a constant angular velocity ω1.

[0040] Calculate the output angular velocity of the driven wheel 31: ω2=ω1 / i12=ω1 / √((2-e 2 ) / (1-e 2 sin 2 θ1)-1). (Formula 2) Calculate maximum / minimum speed and gear ratio: i_min=√(1-e²)(at θ1=0°,180°), i_c=1(at θ1=45°,225°) i_max=1 / √(1-e²)(at θ1=90°,270°), i_d=1(at θ1=135°,315°) ω2_max=ω1 / i_min=ω1 / √(1-e²)(maximum angular velocity of the driven wheel 31) ω2_min=ω1 / i_max=ω1×√(1-e²) ​​(minimum angular velocity of the driven wheel 31) For example, assume that: the major axis a = 50 mm, the minor axis b = 40 mm, the driving wheel 32 rotates at a constant speed ω1 = 10 rad / s, and the current position of the driving wheel 32 θ1 = 30° (measured from the starting position of the major axis) calculate: 1. Eccentricity e: e=√(1-(b² / a²))=√(1-(40² / 50²))=√(1-(1600 / 2500))=√(1-0.64)=√(0.36)=0.6 e²=0.36 2. Instantaneous transmission ratio i12 (according to formula 1): cos(30°)=√3 / 2≈0.8660 cos²(30°)≈(0.8660)²=0.75 sin(30°)=0.5 sin2(30°) = 0.25 i12=√(1-0.36×0.75) / √(1-0.36×0.25)= √0.73 / √0.91=0.8957 3. From the driven wheel 31 angular velocity ω2 (according to formula 2): ω2=ω1 / i12=10 rad / s / 0.8957≈11.16 rad / s 4. Analysis: At θ1=30°, i12≈0.8957<1, so ω2≈11.16 rad / s>ω1=10 rad / s, the driven wheel 31 is accelerating the driven wheel 31.

[0041] ① Maximum speed (θ1=0°): i_min=√(1-e²)=√(1-0.36)= √0.64=0.8 ω2_max=ω1 / i_min=10 / 0.8=12.5 rad / s ② Minimum speed (θ1=90°): i_max=1 / √(1-e²)=1 / √0.64=1.25 ω2_min=ω1 / i_max=10 / 1.25=8 rad / s ③ θ1=45°: cos45°= sin45°=√2 / 2≈0.7071 cos²45°= sin²45°=(0.7071)^2≈0.5 1-e²×cos²θ1=1-e²×sin ²θ1 i12=1 ω2=10 / 1=10 rad / s ④ θ1=135°:cos²135°= sin²135°=cos²45°=0.5, so the same as 45° ω2=10 rad / s ⑤ θ1=225°: Similarly, cos²225°=sin²225°=cos²45°=0.5, so ω2=10 rad / s ⑥ θ1=315°:cos²315°=sin²315°=cos²45°=0.5, so ω2=10 rad / s In summary, in the transmission process of the driving wheel 32 and the driven wheel 31, a variable transmission ratio transmission can be achieved, so that the driven wheel 31 rotates at a variable angular velocity. The driven wheel 31 has an acceleration rotation process, and the rotation angle θ1 of the driving wheel 32 (the angle of the second zone 322) is 0° to 45°, 135° to 225°, and 315° to 360° (measured from the starting position of the long axis) in the acceleration rotation process. The driven wheel 31 has a gentle rotation process, and the rotation angle θ1 of the driving wheel 32 (the angle of the first zone 321) is 45° to 135° and 225° to 315° in the gentle rotation process.

[0042] In some embodiments, the driving wheel 32 and the driven wheel 31 have a set of preferred parameters: the number of teeth of the driving wheel 32 is 28, the long semi-axis of the driving wheel 32 is 15 mm, the short semi-axis of the driving wheel 32 is 3 mm, the eccentricity e of the driving wheel 32 is 0.98, the number of teeth of the driven wheel 31 is 72, the long semi-axis of the driven wheel 31 is 35.62 mm, the short semi-axis of the driven wheel 31 is 15 mm, the eccentricity e of the driven wheel 31 is 0.9, and the center distance of the driving wheel 32 and the driven wheel 31 is 41.62 mm.

[0043] In some embodiments, referring to Figures 1-4 and Figure 8 , the head-up display 100 further comprises a housing 1, the mirror 2 is provided with a first rotation shaft 21, the first rotation shaft 21 is rotatably arranged on the housing 1, and the rotation axis of the driven wheel 31 is located on the first rotation shaft 21, which is beneficial to reduce the fluctuation of the rotation of the mirror 2 driven by the driven wheel 31. The motor 33 is fixed to the housing 1.

[0044] In some embodiments, the number of first rotation shafts 21 is two, which are respectively located at both ends of the mirror 2, which is beneficial to improve the stability of the rotation of the mirror 2.

[0045] In some embodiments, the housing 1 comprises an upper housing 11 and a lower housing 12, the upper housing 11 and the lower housing 12 are detachably connected, one end of the upper housing 11 and one end of the lower housing 12 clamping the first rotation shaft 21 of one end of the mirror 2, and the other end of the upper housing 11 and the other end of the lower housing 12 clamping the first rotation shaft 21 of the other end of the mirror 2, so that the mirror 2 can rotate relative to the housing 1.

[0046] In some embodiments, the head-up display 100 further comprises a spring 4 for limiting the first rotation shaft 21 of the mirror 2 to reduce the possibility of the mirror 2 being separated from the housing 1. In some embodiments, the number of springs 4 is two, and the two springs 4 are respectively used to limit the two first rotation shafts 21 of the mirror 2.

[0047] In some embodiments, the shell 1 further comprises a lens 5 and a bottom shell 13, the bottom shell 13 is detachably connected to the lower shell 12, the bottom shell 13 and the lower shell 12 clamp the lens 5, and the lens 5 is used to assist the reflecting mirror 2 to transmit optical information.

[0048] In some embodiments, the head-up display 100 further comprises a fixing base 34 and a second rotating shaft 35, the fixing base 34 is fixed to the shell 1, the motor 33 is fixed to the fixing base 34, one end of the second rotating shaft 35 is fixed to the output shaft of the motor 33, the other end of the second rotating shaft 35 is rotatably arranged in the fixing base 34, and the driving wheel 32 is fixed to the second rotating shaft 35, which is conducive to improving the stability of the rotation of the driving wheel 32.

[0049] In some embodiments, the head-up display 100 further comprises a limiting assembly, the limiting assembly comprises a limiting circuit board 36 and a sensor (not shown in the figure) arranged on the limiting circuit board 36, the limiting circuit board 36 is fixed to the fixing base 34, the limiting circuit board 36 is electrically connected to the sensor and the motor 33, the sensor is used to identify the position of the reflecting mirror 2, the meshing area of the driven wheel 31 comprises a first edge 311 and a second edge 312 which are opposite in the rotation direction, when the first edge 311 or the second edge 312 meshes with the driving wheel 32, the sensor transmits an electrical signal to the limiting circuit board 36, and the limiting circuit board 36 controls the motor 33 to stop rotating.

[0050] In some embodiments, the sensor can be a position sensor, such as a magnetostrictive position sensor (GEFRAN MK4-P, GEFRAN RK-2) or a Hall effect position sensor (VARIOHM ELHM linear position sensor, VARIOHM Euro-CMRS micro rotary sensor).

[0051] In some embodiments, the head-up display 100 further comprises a control circuit board 6 and a wire harness 37, the control circuit board 6 is arranged between the bottom shell 13 and the lower shell 12, the control circuit board 6 is electrically connected to the limiting circuit board 36 and the motor 33 through the wire harness 37, and the control circuit board 6 can receive the electrical signal of the limiting circuit board 36 to assist in controlling the start, stop and change of the rotation direction of the motor 33.

[0052] The application also provides a vehicle embodiment, which comprises the above-mentioned head-up display 100, and the functions and structures of the head-up display 100 can be referred to the above-mentioned embodiments, which will not be described here one by one.

[0053] It should be noted that the preferred embodiments of the present application are described in the specification and its drawings only for the purpose of better understanding the present application, and the present application can be implemented in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not intended to be additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, each of the above technical features continues to be combined with each other, forming various embodiments not listed above, which are all considered to be within the scope of the present application specification; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes shall fall within the scope of protection of the claims of the present application.

Claims

1. A head-up display, characterized in that: include: a reflector, wherein the reflector is used to transmit optical information; A driven wheel fixed to the reflector; a driving wheel, meshed with the driven wheel; a motor, wherein the output shaft of the motor is connected to the driving wheel to drive the driving wheel to rotate, thereby driving the driven wheel and the reflector to rotate in turn; The pitch lines of the driven wheel and the driving wheel are both elliptical, so that the reflector can rotate at a variable speed under the drive of the motor.

2. The head-up display according to claim 1, wherein: The meshing area of ​​the driving wheel includes a first area and a second area. When the first area is meshed with the driven wheel, the driving wheel and the driven wheel have a first transmission ratio; when the second area is meshed with the driven wheel, the driving wheel and the driven wheel have a second transmission ratio; the second transmission ratio is smaller than the first transmission ratio.

3. The head-up display according to claim 2, wherein: The polar diameter of the second region is larger than the polar diameter of the first region.

4. The head-up display according to claim 3, characterized in that When the first zone is engaged with the driven wheel, the driving wheel and the driven wheel have a first center distance; when the second zone is engaged with the driven wheel, the driving wheel and the driven wheel have a second center distance; the second center distance is the same as the first center distance.

5. The head-up display according to claim 4, characterized in that During the transmission process between the driving wheel and the driven wheel, the center distance between the driving wheel and the driven wheel remains unchanged.

6. The head-up display according to claim 2, wherein: There are two second areas, and the two second areas are connected to two ends of the first area respectively.

7. The head-up display according to any one of claims 1 to 6, characterized in that: The head-up display further includes a housing. The reflector is provided with a first rotating shaft, which is rotatably arranged on the housing. The rotation axis of the driven wheel is located on the first rotating shaft, and the motor is fixed to the housing.

8. The head-up display according to claim 7, characterized in that The head-up display also includes a fixed base and a second rotating shaft, the fixed base is fixed to the shell, the motor is fixed to the fixed base, one end of the second rotating shaft is fixed to the output shaft of the motor, the other end of the second rotating shaft is rotatably arranged on the fixed base, and the driving wheel is fixed to the second rotating shaft.

9. The head-up display according to any one of claims 1 to 6, characterized in that: The head-up display also includes a limit assembly, which is electrically connected to the motor and is used to identify the position of the reflector. The engagement area of ​​the driven wheel includes a first edge and a second edge opposite to each other in the rotation direction. When the first edge or the second edge engages with the driving wheel, the limit assembly controls the motor to stop rotating.

10. A means of transport, characterized in that: The method comprises a head-up display as claimed in any one of claims 1 to 9.

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