Lens transmission assembly, head-up display device and vehicle

Abstract

The application discloses a lens transmission assembly, a head-up display device and a vehicle, which comprises a worm base and a shell. The worm base comprises a first connecting arm and a second connecting arm. The first connecting arm comprises a first end face, and the first end face is provided with a first arc-shaped protrusion. The second connecting arm comprises a second end face, and the second end face is provided with a second arc-shaped protrusion. The worm base is arranged on the shell, and the shell comprises a first connecting groove and a second connecting groove. The first connecting groove comprises a first inner wall, and the first arc-shaped protrusion is in abutment with the first inner wall. The second connecting groove comprises a second inner wall, and the second arc-shaped protrusion is in abutment with the second inner wall. When the first arc-shaped protrusion and the second arc-shaped protrusion are in abutment with the first inner wall and the second inner wall, a point-surface contact mode is formed, and the mode makes the friction between the worm base and the shell smaller when the worm base rotates. The above scheme reduces the friction between the worm base and the shell, and improves the fluency and transmission accuracy when the lens is transmitted.

Description

Technical Field

[0001] This application relates to the field of HUD technology, and more particularly to a lens drive assembly, a head-up display device, and a vehicle. Background Technology

[0002] With the development of modern technology, head-up display (HUD) technology is being used more and more widely, especially in the automotive field. Currently, most HUD transmission modules use a worm gear drive system. The worm gear seat and the housing have surface-to-surface contact, resulting in significant friction and potentially inaccurate lens positioning during transmission. Summary of the Invention

[0003] This application aims to provide a lens transmission assembly, a head-up display device, and a vehicle, with the goal of reducing friction between the worm gear seat and the housing during transmission.

[0004] In a first aspect, this application proposes a lens transmission assembly, including a worm gear seat and a housing. Along a first direction, the worm gear seat includes a first connecting arm and a second connecting arm disposed opposite to each other. The first connecting arm includes a first end face facing away from the second connecting arm, and the first end face has a first arcuate protrusion. The second connecting arm includes a second end face facing away from the first connecting arm, and the second end face has a second arcuate protrusion. The worm gear seat is disposed in the housing, and the housing includes a first connecting groove and a second connecting groove disposed opposite to each other. The first connecting arm extends at least partially into the first connecting groove, and along the first direction, the first connecting groove includes a first inner wall facing the first connecting arm, and the first arcuate protrusion abuts against the first inner wall. The second connecting arm extends at least partially into the second connecting groove, and along the first direction, the second connecting groove includes a second inner wall facing the second connecting arm, and the second arcuate protrusion abuts against the second inner wall.

[0005] In the above scheme, the first connecting arm and the second connecting arm of the worm gear holder are respectively disposed in the first connecting groove and the second connecting groove of the housing. The first arc-shaped protrusion of the first connecting arm abuts against the first inner wall, and the second arc-shaped protrusion of the second connecting arm abuts against the second inner wall. When the first and second arc-shaped protrusions abut against the first and second inner walls, a point-to-surface contact is formed. This contact method reduces the friction between the worm gear holder and the housing during rotation. Specifically, when there is surface-to-surface contact, the contact points are denser and more uniform. During relative sliding, the total intermolecular adhesion forces that need to be overcome are greater, resulting in greater total friction. However, point-to-surface contact reduces the number of contact points, the intermolecular adhesion forces that need to be overcome are smaller, and the total friction is smaller. Furthermore, the contact points formed by the first and second arc-shaped protrusions and the first and second inner walls can make the rotation axis of the worm gear holder relatively stable, reducing the displacement of the worm gear holder in the non-rotational direction during operation and reducing errors. Through the above scheme, the friction between the worm gear holder and the housing is reduced, improving the smoothness and transmission accuracy of lens transmission.

[0006] In some embodiments, the first connecting arm includes a third end face, the second connecting arm includes a fourth end face, the first connecting groove includes a first outer wall facing the first connecting arm, and the second connecting groove includes a second outer wall facing the second connecting arm. A first gap exists between the third end face and the first outer wall, and a second gap exists between the fourth end face and the second outer wall. By providing a first gap between the third end face of the first connecting arm and the first outer wall of the first connecting groove, and a second gap between the fourth end face of the second connecting arm and the second outer wall of the second connecting groove, the two end faces of the first and second connecting arms do not contact the two walls of the first and second connecting grooves, reducing the contact area between the worm gear seat and the housing, and further reducing the friction between the worm gear seat and the housing.

[0007] In some embodiments, along the second direction, the first connecting arm includes a first arcuate surface and a second arcuate surface disposed opposite to each other, and the second connecting arm includes a third arcuate surface and a fourth arcuate surface disposed opposite to each other. The second direction is perpendicular to the first direction. The first and second arcuate surfaces in the first connecting arm, and the third and fourth arcuate surfaces in the second connecting arm, reduce the resistance of the contact between the first and second connecting arms and the housing when the worm gear seat rotates, thereby improving the smoothness of rotation.

[0008] In some embodiments, the lens transmission assembly further includes a worm and a lens. The worm seat includes a first mounting groove, and the worm is rotatably disposed within the first mounting groove. The lens is rotatably connected to the housing, and the lens is provided with a worm wheel structure that meshes with the worm. The first mounting groove, formed in the worm seat, allows the worm to be disposed within it. The first mounting groove provides constraint force during worm rotation, reducing errors during worm rotation and improving worm stability.

[0009] In some embodiments, the lens transmission assembly further includes a worm gear spring and a motor, with the worm gear spring disposed on a worm gear seat. The worm gear spring includes a first spring and a second spring connected to each other, arranged sequentially along the axial direction of the worm, with the first spring abutting against the worm. The first spring has a first through hole, and the second spring has a second through hole, coaxially arranged. The motor's drive shaft passes through the first and second through holes and connects to the worm. By providing the worm gear spring and arranging the first and second springs along the worm's axial direction, elastic force can be generated through the deformation of the first and second springs during the meshing transmission between the worm and the lens's worm wheel structure. This elastic force acts on the worm, providing axial displacement compensation and making the meshing transmission between the worm and the worm wheel structure more stable. The motor, with the first spring having a first through hole and the second spring having a second through hole, passes through both holes, making the structure between the motor, the worm gear seat, and the worm more compact and the transmission between the motor and the worm more stable and efficient.

[0010] In some embodiments, the worm spring further includes a third spring connected to the second spring and / or the first spring. The third spring extends from the second spring toward the worm along the direction from the second spring to the worm, and at least partially forms an angle with the axial direction of the worm. The third spring abuts against the housing and the worm seat along the radial direction of the worm. By providing the third spring in the worm spring, forming an angle with the axial direction of the worm and abutting against the housing and the worm seat, when the worm rotates in mesh with the worm wheel structure of the lens, the worm seat rotates, and the meshing of the worm and worm wheel structure loosens due to the rotation of the worm seat. The third spring generates an elastic force on the worm seat through deformation, providing compensation for the meshing of the worm and worm wheel structure in a direction perpendicular to the worm axial direction. This can improve the stability of the meshing of the worm and worm wheel structure and improve the transmission efficiency of the lens.

[0011] In some embodiments, the housing includes a third connecting groove and a fourth connecting groove, and the lens includes a third connecting arm and a fourth connecting arm. The third connecting arm includes a first ball joint, and the fourth connecting arm includes a second ball joint. The first ball joint is rotatably disposed in the third connecting groove, and the second ball joint is rotatably disposed in the fourth connecting groove. By providing the first ball joint and the second ball joint on the third and fourth connecting arms of the lens, the lens is rotatably connected to the housing through the two ball joints. This allows the lens to be rotated and adjusted in multiple directions, making the lens transmission process more flexible and smoother.

[0012] In some embodiments, along the first direction, the first connecting arm is clearance-fitted with the first outer wall, and the width of the first gap is D1, where D1 ≥ 0.5 mm. And / or, along the first direction, the second connecting arm is clearance-fitted with the second outer wall, and the width of the second gap is D2, where D2 ≥ 0.5 mm. Setting the fit between the first and second connecting arms and the first and second outer walls as a clearance fit and providing a certain amount of clearance distance can reduce interference between the worm gear seat and the housing, thereby improving transmission efficiency.

[0013] Secondly, this application proposes a head-up display device, including a lens drive assembly as described in any embodiment of the first aspect.

[0014] Thirdly, this application proposes a means of transportation that includes a head-up display device as described in any embodiment of the second aspect.

[0015] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0017] Figure 1 This is a schematic diagram of the structure of a lens transmission assembly according to some embodiments of this application; Figure 2 This is a schematic diagram of the worm gear seat structure of some embodiments of this application; Figure 3 This is a schematic diagram of the worm gear seat structure of some embodiments of this application; Figure 4 This is a schematic diagram of the housing structure of some embodiments of this application; Figure 5 This is a schematic diagram of the lens structure in some embodiments of this application; Figure 6 This is a schematic diagram of the lens structure in some embodiments of this application; Figure 7 This is a partial structural schematic diagram of a lens transmission assembly according to some embodiments of this application; Figure 8 This is a schematic diagram of the structure of the worm gear spring in some embodiments of this application; Figure 9 This is a partial structural cross-sectional view of a lens transmission assembly according to some embodiments of this application; Figure 10 for Figure 9 Enlarged view of A in the middle; Figure 11 for Figure 9 A magnified view of B in the middle.

[0018] Explanation of reference numerals in the attached drawings: 1. Worm gear seat; 11. First connecting arm; 111. First end face; 112. First arc-shaped protrusion; 113. Third end face; 114. First arc surface; 115. Second arc surface; 12. Second connecting arm; 121. Second end face; 122. Second arc-shaped protrusion; 123. Fourth end face; 124. Third arc surface; 125. Fourth arc surface; 13. First mounting groove; 2. Housing; 21. First connecting groove; 211. First inner wall; 212. First outer wall; 22. Second connecting groove; 221. Second inner wall; 222. Second outer wall; 23. Third connecting groove; 24. Fourth connecting groove; 3. Worm gear; 4. Lens; 41. Worm gear structure; 42. Third connecting arm; 421. First ball joint; 43. Fourth connecting arm; 431. Second ball joint; 5. Worm gear spring; 51. First spring; 511. First through hole; 52. Second spring; 521. Second through hole; 53. Third spring; 6. Electric motor; X, the first direction; Y, the second direction. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0020] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0023] Firstly, this application proposes a lens transmission assembly, please refer to... Figure 1 It includes the worm gear seat 1 and the housing 2.

[0024] The worm seat 1 described above must bear the load of the worm 3 during transmission. To reduce the risk of breakage or deformation during use, materials with high strength and toughness, such as alloy steel, can be used. Furthermore, there is relative movement between the worm seat 1, the worm 3, and the housing 2, which will cause wear over time. This wear can be reduced by heat treating the surface of the worm seat 1.

[0025] As the aforementioned housing 2, which serves as the load-bearing component of the transmission assembly, it must support core components such as the worm gear seat 1 and the lens 4, and will be subject to vibration or impact during operation. The impact of vibration or impact can be reduced by adding reinforcing ribs to housing 2 or by thickening key stress-bearing areas. Furthermore, housing 2 can be made of materials with a shielding coating, such as conductive plastic, to reduce the interference of electromagnetic forces from electromagnetic components such as the motor 6 on optical signals.

[0026] Please refer to Figures 2 to 3 Along the first direction X, the worm gear seat 1 includes a first connecting arm 11 and a second connecting arm 12 disposed opposite to each other. The first connecting arm 11 includes a first end face 111 disposed opposite to the second connecting arm 12, and the first end face 111 is provided with a first arcuate protrusion 112. The second connecting arm 12 includes a second end face 121 disposed opposite to the first connecting arm 11, and the second end face 121 is provided with a second arcuate protrusion 122. The worm gear seat 1 is disposed on a housing 2, and the housing 2 includes a first connecting groove 21 and a second connecting groove 22 disposed opposite to each other. The first connecting arm 11 extends at least partially into the first connecting groove 21. Along the first direction X, the first connecting groove 21 includes a first inner wall 211 facing the first connecting arm 11, and the first arcuate protrusion 112 abuts against the first inner wall 211. The second connecting arm 12 extends at least partially into the second connecting groove 22. Along the first direction X, the second connecting groove 22 includes a second inner wall 221 facing the second connecting arm 12, and the second arcuate protrusion 122 abuts against the second inner wall 221.

[0027] In the above scheme, the first connecting arm 11 and the second connecting arm 12 of the worm gear seat 1 are respectively disposed in the first connecting groove 21 and the second connecting groove 22 of the housing 2. The first arc-shaped protrusion 112 of the first connecting arm 11 abuts against the first inner wall 211, and the second arc-shaped protrusion 122 of the second connecting arm 12 abuts against the second inner wall 221. When the first arc-shaped protrusion 112 and the second arc-shaped protrusion 122 abut against the first inner wall 211 and the second inner wall 221, a point-to-surface contact is formed. This contact method reduces the friction between the worm gear seat 1 and the housing 2 when rotating. It can be understood that the protrusion shape of the first arc-shaped protrusion 112 and the second arc-shaped protrusion 122 can be a general arc shape or a spherical protrusion shape. Specifically, when there is surface-to-surface contact, the contact points are denser and more uniform. During relative sliding, the total amount of intermolecular adhesion forces that need to be overcome is greater, resulting in greater total friction. When there is point-to-surface contact, the number of contact points is reduced, the intermolecular adhesion forces that need to be overcome are smaller, and the total friction is smaller. Furthermore, the contact points formed by the first arc-shaped protrusion 112 and the second arc-shaped protrusion 122 with the first inner wall 211 and the second inner wall 221 can make the rotation axis of the worm gear seat 1 relatively stable, reduce the displacement of the worm gear seat 1 in the non-rotational direction during operation, and reduce errors. Through the above solution, the friction between the worm gear seat 1 and the housing 2 is reduced, and the smoothness and transmission accuracy of the lens 4 during transmission are improved.

[0028] In some embodiments, please refer to Figures 9 to 11The first connecting arm 11 includes a third end face 113, the second connecting arm 12 includes a fourth end face 123, the first connecting groove 21 includes a first outer wall 212 facing the first connecting arm 11, and the second connecting groove 22 includes a second outer wall 222 facing the second connecting arm 12. A first gap exists between the third end face 113 and the first outer wall 212, and a second gap exists between the fourth end face 123 and the second outer wall 222. By providing a first gap between the third end face 113 of the first connecting arm 11 and the first outer wall 212 of the first connecting groove 21, and a second gap between the fourth end face 123 of the second connecting arm 12 and the second outer wall 222 of the second connecting groove 22, the two end faces of the first connecting arm 11 and the second connecting arm 12 do not contact the two walls of the first connecting groove 21 and the second connecting groove 22, reducing the contact area between the worm gear seat 1 and the housing 2, and further reducing the friction between the worm gear seat 1 and the housing 2.

[0029] In some embodiments, please refer to Figure 2 and Figure 3 Along the second direction, the first connecting arm 11 includes a first arcuate surface 114 and a second arcuate surface 115 disposed opposite to each other, and the second connecting arm 12 includes a third arcuate surface 124 and a fourth arcuate surface 125 disposed opposite to each other. The second direction is perpendicular to the first direction X. The first arcuate surface 114 and the second arcuate surface 115 on the first connecting arm 11, and the third arcuate surface 124 and the fourth arcuate surface 125 on the second connecting arm 12, reduce the resistance of the contact between the first connecting arm 11 and the second connecting arm 12 and the housing 2 when the worm gear seat 1 rotates, thereby improving the smoothness of rotation.

[0030] In some embodiments, please refer to Figures 5 to 7 The lens transmission assembly also includes a worm gear 3 and a lens 4. The worm gear seat 1 includes a first mounting groove 13, within which the worm gear 3 is rotatably mounted. The lens 4 is rotatably connected to the housing 2, and the lens 4 is equipped with a worm wheel structure 41 that meshes with the worm gear 3. The first mounting groove 13, located within the worm gear seat 1, provides constraint force during worm gear 3 rotation, reducing errors and improving stability.

[0031] In some embodiments, please refer to Figure 7 and Figure 8The lens transmission assembly also includes a worm gear spring 5 and a motor 6. The worm gear spring 5 is disposed on the worm gear seat 1. The worm gear spring 5 includes a first spring 51 and a second spring 52 connected to each other. The first spring 51 and the second spring 52 are connected and arranged sequentially along the axial direction of the worm 3. The first spring 51 abuts against the worm 3. The first spring 51 has a first through hole 511, and the second spring 52 has a second through hole 521. The first through hole 511 and the second through hole 521 are coaxially arranged. The drive shaft of the motor 6 passes through the first through hole 511 and the second through hole 521 and is connected to the worm 3. By setting the worm gear spring 5 and the first spring 51 and the second spring 52 along the axial direction of the worm 3, elastic force can be generated by the deformation of the first spring 51 and the second spring 52 when the worm 3 and the worm wheel structure 41 of the lens 4 are engaged in transmission. The elastic force acts on the worm 3, providing axial displacement compensation for the worm 3, making the meshing transmission between the worm 3 and the worm wheel structure 41 more stable. A motor 6 is installed, and a first through hole 511 is opened in the first spring plate 51 and a second through hole 521 is opened in the second spring plate 52. The motor 6 is inserted through the first through hole 511 and the second through hole 521, making the structure between the motor 6, the worm seat 1 and the worm 3 more compact, and the transmission between the motor 6 and the worm 3 more stable and efficient.

[0032] In some embodiments, please refer to Figure 7 and Figure 8 The worm spring 5 also includes a third spring 53, which is connected to the second spring 52 and / or the first spring 51. Along the direction from the second spring 52 to the worm 3, the third spring 53 extends from the second spring 52 toward the worm 3, and at least partially forms an angle with the axial direction of the worm 3. In the radial direction of the worm 3, the third spring 53 abuts against the housing 2 and the worm seat 1. With the third spring 53 provided in the worm spring 5, forming an angle with the axial direction of the worm 3 and abutting against the housing 2 and the worm seat 1, when the worm 3 meshes and rotates with the worm wheel structure 41 of the lens 4, the worm seat 1 will rotate. The meshing of the worm 3 and the worm wheel structure 41 will loosen due to the rotation of the worm seat 1. The third spring 53 generates a spring force on the worm seat 1 through deformation, providing compensation for the meshing of the worm 3 and the worm wheel structure 41 in a direction perpendicular to the axial direction of the worm 3. It can improve the stability of the meshing between the worm 3 and the worm wheel structure 41, and improve the transmission efficiency of the lens 4.

[0033] In some embodiments, please refer to Figures 4 to 6The housing 2 includes a third connecting groove 23 and a fourth connecting groove 24. The lens 4 includes a third connecting arm 42 and a fourth connecting arm 43. The third connecting arm 42 includes a first ball joint 421, and the fourth connecting arm 43 includes a second ball joint 431. The first ball joint 421 is rotatably disposed in the third connecting groove 23, and the second ball joint 431 is rotatably disposed in the fourth connecting groove 24. By providing the first ball joint 421 and the second ball joint 431 on the third connecting arm 42 and the fourth connecting arm 43 of the lens 4, the lens 4 is rotatably connected to the housing 2 through the two ball joints. This allows the lens 4 to be rotated and adjusted in multiple directions, making the transmission process of the lens 4 more flexible and smoother.

[0034] In some embodiments, please refer to Figures 9 to 11 Along the first direction X, the first connecting arm 11 is clearance-fitted with the first outer wall 212, with a first gap width of D1, D1≥0.5mm. And / or, along the first direction X, the second connecting arm 12 is clearance-fitted with the second outer wall 222, with a second gap width of D2, D2≥0.5mm. Setting the fit between the first connecting arm 11 and the second connecting arm 12 and the first outer wall 212 and the second outer wall 222 as a clearance fit and setting a certain gap distance can reduce the friction between the worm gear seat 1 and the housing 2, thereby improving the transmission efficiency.

[0035] In this application, arc-shaped protrusions are provided on the first connecting arm 11 and the second connecting arm 12 of the worm gear seat 1, changing the contact method between the first connecting arm 11 and the second connecting arm 12 and the housing 2 from surface-to-surface contact to point-to-surface contact. Furthermore, the fit between the third end face 113 of the first connecting arm 11 and the first outer wall 212 of the first connecting groove 21, and the fit between the fourth end face 123 of the second connecting arm 12 and the second outer wall 222 of the second connecting groove 21, are set as clearance fits, reducing the contact area between the worm gear seat 1 and the housing 2. When the worm 3 meshes with the worm wheel structure 41, the meshing force causes the worm gear seat 1 to rotate around the line connecting the first arc-shaped protrusion and the second arc-shaped protrusion 122. During rotation, the friction between the first arc-shaped protrusion 112 and the second arc-shaped protrusion 122 and the housing 2 is reduced, making the transmission process smoother and improving the transmission accuracy and efficiency of the lens 4.

[0036] Secondly, this application proposes a head-up display device, including a lens drive assembly as described in any embodiment of the first aspect.

[0037] Thirdly, this application proposes a means of transportation that includes a head-up display device as described in any embodiment of the second aspect.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lens transmission assembly, characterized in that, include: A worm gear holder, along a first direction, includes a first connecting arm and a second connecting arm disposed opposite to each other; the first connecting arm includes a first end face disposed away from the second connecting arm, and the first end face is provided with a first arc-shaped protrusion; the second connecting arm includes a second end face disposed away from the first connecting arm, and the second end face is provided with a second arc-shaped protrusion. The housing includes a worm gear seat disposed on the housing, the housing including a first connecting groove and a second connecting groove disposed opposite to each other; the first connecting arm extends at least partially into the first connecting groove, and along the first direction, the first connecting groove includes a first inner wall facing the first connecting arm, and the first arcuate protrusion abuts against the first inner wall. The second connecting arm extends at least partially into the second connecting groove along the first direction, and the second connecting groove includes a second inner wall facing the second connecting arm, with the second arcuate protrusion abutting against the second inner wall.

2. The lens transmission assembly according to claim 1, characterized in that, The first connecting arm includes a third end face, the second connecting arm includes a fourth end face, the first connecting groove includes a first outer wall facing the first connecting arm, and the second connecting groove includes a second outer wall facing the second connecting arm; a first gap exists between the third end face and the first outer wall, and a second gap exists between the fourth end face and the second outer wall.

3. The lens transmission assembly according to claim 1, characterized in that, Along the second direction, the first connecting arm includes a first arc surface and a second arc surface disposed opposite to each other, and the second connecting arm includes a third arc surface and a fourth arc surface disposed opposite to each other; the second direction is perpendicular to the first direction.

4. The lens transmission assembly according to claim 1, characterized in that, The lens transmission assembly further includes a worm gear and a lens. The worm gear seat includes a first mounting groove, and the worm gear is rotatably disposed in the first mounting groove. The lens is rotatably connected to the housing, and the lens is provided with a worm wheel structure, which meshes with the worm gear.

5. The lens transmission assembly according to claim 4, characterized in that, The lens transmission assembly also includes a worm gear spring and a motor, wherein the worm gear spring is disposed on the worm gear seat; The worm gear spring includes a first spring and a second spring connected to each other. The first spring and the second spring are connected and arranged sequentially along the axial direction of the worm. The first spring abuts against the worm. The first spring has a first through hole, and the second spring has a second through hole. The first through hole and the second through hole are coaxially arranged. The drive shaft of the motor passes through the first through hole and the second through hole and is connected to the worm.

6. The lens transmission assembly according to claim 5, characterized in that, The worm gear spring also includes a third spring, which is connected to the second spring and / or the first spring; Along the direction from the second spring to the worm, the third spring extends from the second spring toward the worm, and the third spring at least partially forms an angle with the axial direction of the worm. Along the radial direction of the worm, the third spring abuts between the housing and the worm seat.

7. The lens transmission assembly according to claim 1, characterized in that, The housing includes a third connecting groove and a fourth connecting groove, and the lens includes a third connecting arm and a fourth connecting arm. The third connecting arm includes a first ball joint, and the fourth connecting arm includes a second ball joint. The first ball joint is rotatably disposed in the third connecting groove, and the second ball joint is rotatably disposed in the fourth connecting groove.

8. The lens transmission assembly according to claim 2, characterized in that, Along the first direction, the first connecting arm is clearance-fitted with the first outer wall, the width of the first gap being D1, D1≥0.5mm; and / or, along the first direction, the second connecting arm is clearance-fitted with the second outer wall, the width of the second gap being D2, D2≥0.5mm.

9. A head-up display device, characterized in that, Includes the lens drive assembly as claimed in any one of claims 1 to 8.

10. A means of transportation, characterized in that, Including the head-up display device as described in claim 9.

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