Driving device, engine hood system, pedestrian protection device and vehicle
Patent Information
- Application Number
- CN202410057652.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-15
- Publication Date
- 2025-07-22
Smart Images
Figure CN120348239A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of drive control, and particularly to a drive device, an engine hood system, a pedestrian protection device, and a vehicle. Background Art
[0002] With the development of the automotive industry, the casualties caused by traffic accidents have been increasing. To reduce the injuries of pedestrians, vehicles usually include an active engine hood. Under normal driving conditions, the active engine hood is in a closed state. After a vehicle collides with a pedestrian, the rear end of the active engine hood will be lifted by a drive device, thereby forming a certain buffer space, effectively preventing the pedestrian from colliding with the hard points under the engine hood, and reducing the injuries of pedestrians.
[0003] Currently, the drive device is usually a gunpowder type, which uses the high-pressure gas generated by gunpowder explosion to bounce up the engine hood. However, the gunpowder type drive device cannot be reused, and the maintenance cost is high. Summary of the Invention
[0004] Some embodiments of the present application provide a drive device, an engine hood system, a pedestrian protection device, and a vehicle. The following introduces the present application from multiple aspects, and the embodiments and beneficial effects of the following multiple aspects can be referred to each other.
[0005] In a first aspect, an embodiment of the present application provides a drive device. The drive device includes a support seat, a lifting mechanism, and a clamping mechanism. Among them, the lifting mechanism and the clamping mechanism are arranged on the support seat.
[0006] Among them, the lifting mechanism includes a first transmission member, a second transmission member, and an elastic member. The first transmission member is disposed through the second transmission member. The first transmission member includes a first end and a second end. Among them, the first end includes a first stop portion; the second end extends through the first surface of the support seat to the inside of the support seat, and when the elastic member is in a compressed state, the first stop portion contacts one end of the elastic member, and the first surface contacts the other end of the elastic member. The second transmission member is close to the second end, and the second transmission member can rotate around the first transmission member to a first position inside the support seat. When the second transmission member rotates around the first transmission member to the first position, under the elastic force of the elastic member, the first transmission member moves in a direction away from the support seat. The clamping mechanism is used to clamp the second transmission member to fix the second transmission member at a second position and prevent it from rotating around the first transmission member.
[0007] The above drive device can be repeatedly switched between the initial state and the working state through the cooperation between the support seat, the lifting mechanism, and the clamping mechanism, and has reusability. Therefore, it is not necessary to frequently replace and repair parts, and the maintenance cost is lower.
[0008] For example, when the clamping mechanism clamps the second transmission member of the lifting mechanism, the second transmission member is fixed at the second position. At this time, the elastic member is compressed between the first stop portion of the first transmission member and the first surface of the support base. The driving device is in the initial state.
[0009] When the clamping mechanism releases the second transmission member of the lifting mechanism, the second transmission member can rotate around the first transmission member inside the support base, so as to move from the second position to the first position. In this way, the elastic member can gradually resume its shape, and under the elastic force of the elastic member, the first transmission member moves away from the support base. The driving device is in the working state.
[0010] When it is necessary to reset the driving device from the working state to the initial state, the second end of the first transmission member can be pressed back into the support base to compress the elastic member between the first stop portion of the first transmission member and the first surface of the support base again. Then, the second transmission member is rotated back to the second position, and the second transmission member is fixed at the second position by the clamping mechanism, so that the second transmission member cannot rotate around the first transmission member, so that the elastic member can maintain the compressed state, and further enable the driving device to maintain the initial state.
[0011] In some embodiments, the clamping mechanism includes a driving member and a clamping member. The driving member is used to drive the clamping member to translate in the first direction, the first direction is perpendicular to the rotation axis of the second transmission member, and the clamping member is used to clamp the second transmission member.
[0012] In some embodiments, a convex portion protruding away from the second transmission member in the first direction is formed on the outer peripheral surface of the second transmission member, and a groove matching the convex portion is formed on the clamping member.
[0013] According to the embodiment of the present application, when the groove of the clamping member abuts against the convex portion of the second transmission member, the groove restricts the rotation of the convex portion, thereby fixing the second transmission member at the second position and preventing it from rotating around the first transmission member.
[0014] In some embodiments, an opening portion is formed on the first surface of the support base. The opening portion communicates the inside and the outside of the support base. The second end of the first transmission member extends from the outside of the support base to the inside of the support base through the opening portion. The opening portion is matched with the outer peripheral surface of the second transmission member, and when the second transmission member rotates around the first transmission member inside the support base to the first position, there is a first gap between the inner wall of the opening portion and the outer peripheral surface of the second transmission member in the direction perpendicular to the rotation axis of the second transmission member.
[0015] In this way, when the second transmission member is in the first position, it can be smoothly withdrawn from the inside of the support base via the opening portion, thereby avoiding interference with the movement of the first transmission member by the second transmission member. Exemplarily, the first gap can be greater than 0 mm and less than or equal to 5 mm. For example, the first gap can be 0.5 mm, 1 mm, 2 mm, 5 mm, etc. In this way, the size of the first gap can be made appropriate, so as to ensure that the second transmission member can be smoothly withdrawn from the inside of the support base along a predetermined trajectory, while preventing larger foreign objects from entering the inside of the support base and affecting the movement of the second transmission member.
[0016] In some embodiments, the inside of the support base includes a cavity portion, and the second transmission member can rotate around the first transmission member in the cavity portion. A limiting sliding groove is provided on one of the inner wall of the cavity portion and the outer peripheral surface of the second transmission member, and a sliding member is provided on the other surface. The sliding member extends in a direction perpendicular to the rotation axis of the second transmission member, and the end of the sliding member is located in the limiting sliding groove.
[0017] According to the embodiments of the present application, when the second transmission member rotates around the first transmission member in the cavity portion, the limiting sliding groove and the sliding member will slide relative to each other, so as to limit the rotation of the second transmission member, effectively preventing the second transmission member from turning over due to too fast rotation speed, and ensuring that the second transmission member can move to the first position more accurately and be withdrawn from the inside of the support base.
[0018] In some embodiments, the stroke of the relative sliding of the limiting sliding groove and the sliding member is the length of the intersection line of the first sector area and the plane where the limiting sliding groove is located. The center of the first sector area coincides with the rotation axis of the second transmission member, and the central angle of the first sector area is the rotation angle of the second transmission member around the first transmission member from the second position to the first position.
[0019] In some embodiments, along the extension direction of the rotation axis of the second transmission member, the end face of the second transmission member provided inside the support base faces the inner wall of the inside of the support base, and the fit between the end face of the second transmission member and the inner wall of the inside of the support base is a rolling friction fit.
[0020] In this way, the friction between the end face of the second transmission member and the inner wall of the cavity portion can be effectively reduced, thereby reducing the rotation damping of the second transmission member and making the rotation of the second transmission member smoother.
[0021] In some embodiments, balls or rollers are provided on the end face of the second transmission member.
[0022] In some embodiments, the first transmission member is a ball screw, and the second transmission member is a lead screw nut. The ball screw is disposed through the lead screw nut. The second end of the ball screw includes a second stop portion. Along the extending direction of the screw, when the lead screw nut is fixed at the second position, there is a second gap between the lead screw nut and the second stop portion, so that the lead screw nut can rotate from the second position to the first position.
[0023] According to the embodiments of the present application, when the lead screw nut is released by the clamping mechanism, under the action of gravity, the lead screw nut can rotate around the ball screw and axially move relative to the first transmission member. Based on this, the second gap can ensure that the second transmission member has sufficient axial movement stroke, and further ensure that the second transmission assembly has sufficient rotation stroke. It can be understood that the second gap is related to the thread parameters of the ball screw (for example, parameters such as pitch, thread angle, and number of threads). For example, the second gap can be greater than 0 mm and less than or equal to 5 mm. For example, the second gap G2 can be 0.5 mm, 1 mm, 2 mm, 5 mm, etc. In addition, the ball screw is similar to a rod shape. When the lead screw nut is released by the clamping mechanism, the ball screw can move along its extending direction, and the movement trajectory is controllable. And the second stop portion can ensure that the lead screw nut does not come off the ball screw.
[0024] In some embodiments, the elastic member includes a spring. When the elastic member is in a compressed state, one end of the spring contacts the first stop portion of the first transmission member, and the other end of the spring contacts the first surface of the support seat.
[0025] In some embodiments, the spring is a helical spring, and the helical spring is helically wound around the outer periphery of the first transmission member.
[0026] In some embodiments, a reset groove is formed in the support seat. The reset groove communicates with the inside and the outside of the support seat. The driving device further includes a rotating rod. When the second transmission member is located inside the support seat, the rotating rod is inserted into the support seat from the outside through the reset groove and is connected to the second transmission member located inside the support seat, for driving the second transmission member to rotate around the first transmission member to the second position.
[0027] Through the cooperation of the above-mentioned reset groove and the rotating rod, the second transmission member can be reset to the second position. For example, first, the second transmission member is placed inside the support seat. Then, the rotating rod is inserted into the support seat from the outside through the reset groove and is connected to the second transmission member. For example, the rotating rod is inserted into the second transmission member. Then, the rotating rod is rotated around the first transmission member, and the rotating rod can drive the second transmission member to be reset to the second position during the rotation process.
[0028] In some embodiments, the driving member is a linear motor.
[0029] In a second aspect, an embodiment of the present application provides an engine hood system. The engine hood system includes an engine hood and a driving device provided in any one of the embodiments of the first aspect of the present application. Wherein, the first end of the first transmission member is connected to the engine hood, and when the second transmission member rotates around the first transmission member to a first position, the first transmission member lifts the engine hood away from the support seat under the elastic force of the elastic member.
[0030] In a third aspect, an embodiment of the present application provides a pedestrian protection device. The pedestrian protection device includes a collision signal sensing module, a control module, and a driving device provided in any one of the embodiments of the first aspect of the present application. Wherein, the collision signal sensing module is configured to generate a collision signal based on a detected collision event and transmit the collision signal to the control module, and the control module is configured to send an instruction to the driving device after receiving the collision signal, and the instruction is used to control the clamping mechanism of the driving device to release the second transmission member.
[0031] In a fourth aspect, an embodiment of the present application provides a vehicle. The vehicle includes a vehicle body, an engine hood, and a driving device provided in any one of the embodiments of the first aspect of the present application. Wherein, the engine hood and the driving device are arranged on the vehicle body, the first end of the first transmission member is connected to the engine hood, and when the second transmission member rotates around the first transmission member to a first position, the first transmission member lifts the engine hood away from the support seat under the elastic force of the elastic member.
[0032] It should be understood that the beneficial effects of the above second aspect to the fourth aspect can refer to the description of the foregoing first aspect and will not be elaborated herein. Description of the Drawings
[0033] Figure 1 Shows an exemplary structure of a vehicle in an embodiment of the present application;
[0034] Figure 2 Shows a schematic diagram of the engine hood of the vehicle in the embodiment of the present application being lifted upward;
[0035] Figure 3A Shows a perspective view of the driving device in the embodiment of the present application;
[0036] Figure 3B Shows a partial structure of the driving device in the embodiment of the present application along Figure 3A A cross-sectional view taken along section A-A in;
[0037] Figure 4A Shows a perspective view of the driving device in the working state in the embodiment of the present application Figure 1 ;
[0038] Figure 4B Shows a partial structure of the driving device in the working state in the embodiment of the present application along Figure 4A A cross-sectional view taken along section A-A inFigure 1 ;
[0039] Figure 5A Shows a three-dimensional view of the driving device in the working state in the embodiment of the present application Figure 2 ;
[0040] Figure 5B Shows a partial structure of the driving device in the working state in the embodiment of the present application along Figure 5A The sectional view of the A-A section in Figure 2 ;
[0041] Figure 6A Shows a three-dimensional view of the cooperation between the support seat and the second transmission member in the driving device in the embodiment of the present application Figure 1 ;
[0042] Figure 6B Shows a top view of the cooperation between the support seat and the second transmission member in the driving device in the embodiment of the present application Figure 1 ;
[0043] Figure 7A Shows a three-dimensional view of the cooperation between the support seat and the second transmission member in the driving device in the embodiment of the present application Figure 2 ;
[0044] Figure 7B Shows a top view of the cooperation between the support seat and the second transmission member in the driving device in the embodiment of the present application Figure 2 ;
[0045] Figure 8A Shows a schematic view of the cooperation between the cavity part of the support seat and the second transmission member in the embodiment of the present application Figure 1 ;
[0046] Figure 8B Shows a schematic view of the cooperation between the cavity part of the support seat and the second transmission member in the embodiment of the present application Figure 2 ;
[0047] Figure 9 Shows the driving device in the embodiment of the present application in Figure 3B The partial enlarged view of the S1 area in;
[0048] Figure 10 Shows a schematic diagram of the driving device reset from the working state to the initial state in the embodiment of the present application;
[0049] Figure 11A Shows a three-dimensional view of the lifting mechanism in the driving device in the embodiment of the present application;
[0050] Figure 11B Shows the lifting mechanism in the driving device in the embodiment of the present application along Figure 11A The sectional view of the A-A section in. Detailed implementation manners
[0051] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0052] The embodiment of the present application is used to provide a driving device, including the engine hood system, pedestrian protection device and vehicle of the driving device. The driving device can be reused and has a relatively low maintenance cost.
[0053] Figure 1 An exemplary structure of vehicle 1 in the embodiment of the present application is shown. Refer to Figure 1 , vehicle 1 includes a vehicle body 01 and an engine hood 02. The engine hood 02 is provided at the front end of the vehicle body 01.
[0054] Generally, when vehicle 1 in motion collides with a pedestrian, due to inertia, the upper body of the pedestrian will rotate towards the direction close to the vehicle body 01, resulting in the pedestrian's head colliding with the engine hood 02. Since there are many hard points under the engine hood 02 (such as shock towers, engines, the lower frame 03 of the front windshield, etc.), when the pedestrian's head collides with the hard points, a huge acceleration is generated, which is likely to cause head injuries.
[0055] Therefore, the engine hood 02 of vehicle 1 is usually an active engine hood. When vehicle 1 is driving normally, the engine hood 02 is in a closed state. When vehicle 1 collides with a pedestrian, the engine hood 02 will lift upwards, thereby forming a certain buffer space, effectively preventing the pedestrian's head from colliding with the hard points under the engine hood 02 and reducing the injury to the pedestrian's head.
[0056] Specifically, Figure 2 A schematic diagram of the engine hood 02 of vehicle 1 lifting upwards in the embodiment of the present application is shown. Refer to Figure 2 and in combination with Figure 1 , vehicle 1 may include a collision sensing module 10, a control module 20 and a driving device 30.
[0057] Among them, the collision sensing module 10 can be set at the front end of the vehicle body 01, generally a sensor, for example, an acceleration sensor, a pressure tube sensor, etc., which is used to detect the collision event of the engine hood 02 in real time, and then generate a collision signal based on the detected collision event and transmit the collision signal to the control module 20. The control module 20 can be set inside the vehicle body 01, which is used to receive the collision signal from the collision sensing module 10 and control the driving device 30 to lift the engine hood 02 according to the collision signal. The driving device 30 is set at one end of the engine hood 02 close to the lower frame 03 of the front windshield to facilitate lifting the engine hood 02.
[0058] When the vehicle 1 collides with a pedestrian, the collision sensing module 10 detects a collision event of the engine hood 02, then generates a collision signal based on this collision event, and transmits the collision signal to the control module 20. After receiving the collision signal, the control module 20 issues an instruction to the driving device 30 to control the driving device 30 to lift the engine hood 02, so as to form a certain buffer space below the engine hood 02, reduce the injury of the pedestrian's head, and play a role in protecting the pedestrian.
[0059] In some technical solutions, the driving device is a powder type, and the high-pressure gas generated by the explosion of gunpowder is used to bounce up the engine hood. However, the powder type driving device cannot be reused, and after the gunpowder explodes, component replacement and maintenance are also required for the driving device, and the overall cost is relatively high.
[0060] To solve the above problems, the embodiment of the present application provides a driving device. Compared with the above-mentioned powder type driving device, the driving device provided by the present application is a mechanical type and can be reused, thereby effectively reducing the maintenance cost. The technical solution of the present application will be introduced in detail below with reference to the accompanying drawings.
[0061] Figure 3A The perspective view of the driving device 30 in the embodiment of the present application is shown. Figure 3B The partial structure of the driving device 30 in the embodiment of the present application is shown along Figure 3A the cross-sectional view of the A-A section in. Among them, for the convenience of observation, Figure 3A the partial structural features of the support seat 100 are shown in dotted lines in. Refer to Figure 3A and Figure 3B , the driving device 30 includes a support seat 100, a lifting mechanism 200, and a clamping mechanism 300. Among them, the lifting mechanism 200 and the clamping mechanism 300 are respectively arranged on the support seat 100.
[0062] Among them, the lifting mechanism 200 includes a first transmission member 210, a second transmission member 220, and an elastic member 230. The first transmission member 210 includes a first end 210A and a second end 210B. The first end 210A of the first transmission member 210 is used to connect with the engine hood (for example, the engine hood 02 described above). The second end 210B of the first transmission member 210 extends through the first surface 110 of the support seat 100 to the inside of the support seat 100. The second transmission member 220 is sleeved on the outer periphery of the first transmission member 210, or in other words, the first transmission member 210 passes through the second transmission member 220. And, the second transmission member 220 is arranged close to the second end 210B of the first transmission member 210. Along the Z direction, the elastic member 230 is located between the first end 210A of the first transmission member 210 and the first surface 110 of the support seat 100.
[0063] The clamping mechanism 300 can clamp or release the second transmission member 220 of the lifting mechanism 200, so that the driving device 30 can be maintained in the initial state or enter the working state.
[0064] Specifically, referring to Figure 3A and Figure 3B , when the clamping mechanism 300 clamps the second transmission member 220 of the lifting mechanism 200, the driving device 30 is in the initial state. The second transmission member 220 is fixed at the second position. For example, when viewed from the perspective of the Z direction, the second transmission member 220 located at the second position is similar to a "cross" shape, and the rotation angle of the "cross" shape relative to the X direction is 0°, that is, one of the horizontal and vertical directions of the "cross" shape is parallel to the X direction, and the other is perpendicular to the X direction. Among them, the X direction is perpendicular to the Z direction.
[0065] At this time, the elastic member 230 is compressed between the first end 210A of the first transmission member 210 and the first surface 110 of the support seat 100. Exemplarily, the first end 210A includes a first stop portion 211A. The first stop portion 211A is generally disk-shaped. One end of the elastic member 230 abuts against the first stop portion 211A, and the other end of the elastic member 230 abuts against the first surface 110.
[0066] Figure 4A and Figure 4B show the schematic diagram of the driving device 30 in the working state in the embodiment of the present application Figure 1 , where Figure 4A is the perspective view of the driving device 30, Figure 4B is the cross-sectional view of a part of the structure in the driving device 30 along the Figure 4A A-A section in Figure 5A and Figure 5B show the schematic diagram of the driving device 30 in the working state in the embodiment of the present application Figure 2 , where Figure 5A is the perspective view of the driving device 30, Figure 5B is the cross-sectional view of a part of the structure in the driving device 30 along the Figure 5A A-A section in
[0067] Referring to Figure 4A and Figure 4B , when the clamping mechanism 300 releases the second transmission member 220 of the lifting mechanism 200, the second transmission member 220 can rotate around the first transmission member 210 inside the support seat 100, so as to move from Figure 3A and Figure 3B the second position shown to Figure 4A and Figure 4BThe first position shown. For example, when viewed from a perspective along the Z direction, the second transmission member 220 located at the first position is similar to an "X" shape, and the rotation angle of the "X" shape relative to the X direction is 45°. That is, the second transmission member 220 rotates 45° from the Figure 3A and Figure 3B shown "cross" shape and becomes the Figure 4A and Figure 4B shown "X" shape. Among them, the rotation axis L1 of the second transmission member 220 can extend along the Z direction.
[0068] In this way, continuing to refer to Figure 5A and Figure 5B , the elastic member 230 can gradually return to its original shape, and under the elastic force of the elastic member 230, the first transmission member 210 moves away from the support base 100, so as to be able to lift the engine hood (for example, the engine hood 02 described above). The drive device 30 is in a working state.
[0069] When it is necessary to reset the drive device 30 from the Figure 5A and Figure 5B shown working state back to the Figure 3A and Figure 3B shown initial state, the second end 210B of the first transmission member 210 can be pressed back into the interior of the support base 100 to compress the elastic member 230 again between the first end 210A of the first transmission member 210 and the first surface 110 of the support base 100. Then, rotate the second transmission member 220 back to the Figure 3A and Figure 3B shown second position, and fix the second transmission member 220 at the second position through the clamping mechanism 300, so that the second transmission member 220 cannot rotate around the first transmission member 210, so that the elastic member 230 can maintain a compressed state, and further enable the drive device 30 to maintain the initial state.
[0070] In summary, the drive device 30 provided in the present application can be repeatedly switched between the initial state and the working state through the cooperation between the support base 100, the lifting mechanism 200 and the clamping mechanism 300, and has reusability. Compared with the above-mentioned gunpowder-type drive device that requires replacement and repair of components after gunpowder explosion, the drive device 30 provided in the present application can be reused, so there is no need to frequently replace and repair components, and the maintenance cost is lower.
[0071] It can be understood that the greater the elastic force of the elastic member 230 of the lifting mechanism 200, the greater the height and strength of the first transmission member 210 to lift the engine hood 02; on the contrary, the smaller the elastic force of the elastic member 230 of the lifting mechanism 200, the smaller the height and strength of the first transmission member 210 to lift the engine hood 02. Therefore, the lifting height and strength can be controlled by selecting elastic members 230 with different elastic forces.
[0072] The following further introduces the specific structures of the components in the driving device 30 in conjunction with the accompanying drawings.
[0073] Continuing to refer to Figure 3B 、 Figure 4B and Figure 5B , the support base 100 includes an opening portion 120. The opening portion 120 is formed in the first surface 110 of the support base 100. The interior of the support base 100 includes a cavity portion 130. The opening portion 120 communicates the exterior of the support base 100 with the cavity portion 130 inside the support base 100. In this way, the second end 210B of the first transmission member 210 can extend from the exterior of the support base 100 to the cavity portion 130 inside the support base 100 via the opening portion 120. The second transmission member 220 can rotate in the cavity portion 130 inside the support base 100 to switch between a first position and a second position.
[0074] Figure 6A and Figure 6B show a schematic diagram of the cooperation between the support base 100 and the second transmission member 220 in the driving device 30 according to an embodiment of the present application. Figure 1 , at this time, the second transmission member 220 is located at the first position, wherein Figure 6A is a perspective view of the support base 100, Figure 6B is a top view of the support base 100.
[0075] Referring to Figure 6A and Figure 6B , in some embodiments of the present application, the opening portion 120 of the support base 100 cooperates with the outer peripheral surface of the second transmission member 220. That is to say, the shape of the opening portion 120 of the support base 100 is similar to the contour of the outer peripheral surface of the second transmission member 220. For example Figure 6A and Figure 6B shown, the second transmission member 220 includes four arc-shaped walls F1 and four protruding portions F2 that are alternately connected. Among them, the arc-shaped walls F1 protrude a small arc in a direction away from the rotation axis L1, and the protruding portions F2 protrude a larger dimension in a direction away from the rotation axis L1. The inner wall of the opening portion 120 of the support base 100 includes four arc-shaped walls F3 and four grooves F4 that are alternately connected. Among them, the arc-shaped walls F3 are recessed a small arc in a direction away from the rotation axis L1 to be able to cooperate with the arc-shaped walls F1; the grooves F4 are recessed a larger dimension in a direction away from the rotation axis L1 to be able to cooperate with the protruding portions F2.
[0076] Continuing to refer to Figure 6A and Figure 6B, when the second transmission member 220 is in the first position, there is a first gap G1 between the inner wall of the opening portion 120 and the outer peripheral surface of the second transmission member 220 along a direction perpendicular to the Z direction (for example, the radial direction of the second transmission member 220). That is to say, when the second transmission member 220 is in the first position, the orthographic projection area of the opening portion 120 on the first plane M1 covers the orthographic projection area of the second transmission member 220 on the first plane M1, and the area of the orthographic projection area of the opening portion 120 on the first plane M1 is larger than the area of the orthographic projection area of the second transmission member 220 on the first plane M1. Or, it can also be understood that when the second transmission member 220 is in the first position, after its orthographic projection area on the first plane M1 is enlarged by a certain proportion, it can coincide with the orthographic projection area of the opening portion 120 on the first plane M1. In this way, it can be ensured that when the second transmission member 220 is in the first position, it can be withdrawn from the inside of the support base 100 through the opening portion 120, thereby avoiding interference of the second transmission member 220 with the movement of the first transmission member 220.
[0077] For example, the orthographic projection areas of the opening portion 120 and the second transmission member 220 in the first position on the first plane M1 are both similar to an "X" shape, the "X" shape of the second transmission member 220 covers the "X" shape of the second transmission member 220, and after the "X" shape of the second transmission member 220 is enlarged by a certain proportion, it can completely coincide with the "X" shape of the opening portion 120.
[0078] In some embodiments of the present application, the first gap G1 can be greater than 0 mm and less than or equal to 5 mm. For example, the first gap G1 can be 0.5 mm, 1 mm, 2 mm, 5 mm, etc. In this way, the size of the first gap G1 can be moderate, so as to ensure that the second transmission member 220 can be smoothly withdrawn from the inside of the support base 100 along a predetermined trajectory, and at the same time prevent larger foreign objects from entering the inside of the support base 100 and affecting the movement of the second transmission member 220.
[0079] Figure 7A and Figure 7B shows a schematic diagram of the cooperation between the support base 100 and the second transmission member 220 in the drive device 30 in the embodiments of the present application Figure 2 , at this time, the second transmission member 220 is in the second position, where Figure 7A is a perspective view of the support base 100, Figure 7B is a top view of the support base 100. Refer to Figure 7A and Figure 7B, when the second transmission member 220 is in the second position, the orthographic projection area of it on the first plane M1 is approximately in the shape of a "plus" sign. At this time, a part of the orthographic projection area of the second transmission member 220 in the first plane M1 is located outside the orthographic projection area of the opening part 120 in the first plane M1. Therefore, the second transmission member 220 in the second position cannot be withdrawn from the inside of the support base 100 through the opening part 120. After rotating 45°, it becomes the Figure 6A and Figure 6B shown "X" shape (that is, the form when the second transmission member 220 is in the first position), and then it can be withdrawn from the inside of the support base 100 through the opening part 120. In this way, it can effectively prevent the second transmission member 220 from accidentally disengaging from the inside of the support base 100, and further improve the reliability of the driving device 30.
[0080] It can be understood that the overall outer peripheral surface contour of the second transmission member 220 being approximately in the shape of a cross is only for illustrative purposes. In other embodiments, the outer peripheral surface contour of the second transmission member 220 can also be other shapes, such as a star shape, a rectangle, a triangle, or other irregular shapes, and the opening part 120 of the support base 100 can be a shape corresponding to the shape of the outer peripheral surface contour of the second transmission member 200. The present application does not limit this, as long as the second transmission member 220 in the first position can be withdrawn from the inside of the support base 100 through the opening part 120, and the second transmission member 220 in the second position cannot be withdrawn from the inside of the support base 100 through the opening part 120.
[0081] In addition, it can be understood that the rotation angle of the second transmission member 220 from the first position to the second position is 45°, but the present application is not limited thereto. In other embodiments, the rotation angle of the second transmission member 220 from the first position to the second position can also be other values. For example, the rotation angle of the second transmission member 220 from the first position to the second position can be greater than 0° and less than or equal to 45°, such as 0.5°, 1°, 10°, 20°, etc.
[0082] In some embodiments of the present application, the inner wall of the cavity part 130 of the support base 100 and the outer peripheral surface of the second transmission member 220 can be matched by a limit chute and a sliding member, so as to limit the rotation angle of the second transmission member 220, prevent the second transmission member 220 from turning too far due to too fast a rotation speed, and ensure that the second transmission member 220 can move to the first position more accurately and be withdrawn from the inside of the support base 100 through the opening part 120.
[0083] Exemplarily, Figure 8A and Figure 8B show a schematic diagram of the cooperation between the cavity part 130 of the support base 100 and the second transmission member 220 in the embodiments of the present application. Refer to Figure 8A andFigure 8B , a limiting chute 131 extending along the B direction is provided on the inner wall of the cavity portion 130. A sliding member 221 is provided on the outer peripheral surface of the second transmission member 220. The sliding member 221 extends and protrudes away from the rotation axis L1 in a direction perpendicular to the Z direction. Among them, the sliding member 221 and the second transmission member 220 can be an integrally formed structure or a split structure, and are installed together by assembling, and the present application does not limit this.
[0084] The end of the sliding member 221 is located in the limiting chute 131. When the second transmission member 220 rotates around the rotation axis L1, the sliding member 221 can slide relative to the limiting chute 131. As Figure 8A shown, when the second transmission member 220 is clamped at the second position by the clamping mechanism 300, the end of the sliding member 221 contacts the end 131A of the limiting chute 131; as Figure 8B shown, when the clamping mechanism 300 releases the second transmission member 220, the second transmission member 220 rotates around the rotation axis L1, and the sliding member 221 slides accordingly. When the end of the sliding member 221 slides to the end 131B of the limiting chute 131, the second transmission member 220 is located at the first position, thereby realizing the limiting function, effectively avoiding the second transmission member 220 from turning over due to too fast rotation speed, ensuring that the second transmission member 220 can move to the first position more accurately, and being withdrawn from the inside of the support base 100 through the opening portion 120.
[0085] It can be understood that the rotation angle of the second transmission member 220 described above depends on the relative sliding stroke of the limiting chute 131 and the sliding member 221. Based on this, the dimensions of the relative sliding of the limiting chute 131 and the sliding member 221 are controlled, and then the rotation angle of the second transmission member 220 is controlled. It can be understood that the relative sliding stroke of the limiting chute 131 and the sliding member 221 depends on the length of the limiting chute 131 (for example, the dimension of the limiting chute 131 along the B direction) and the dimension of the sliding member 221 along the B direction.
[0086] For example Figure 8A shown, the relative sliding stroke S0 of the limiting chute 131 and the sliding member 221 can be the length of the intersection line of the first sector region M2 and the inner wall of the cavity portion 130. Among them, the center of the first sector region M2 coincides with the rotation axis L1, and the central angle of the first sector region M2 is the rotation angle α of the second transmission member 220 from the second position to the first position. And, subtracting the dimension of the sliding member 221 along the B direction from the dimension of the limiting chute 131 along the B direction can obtain the relative sliding stroke S0 of the limiting chute 131 and the sliding member 221.
[0087] In other alternative implementations, the limiting sliding groove 131 can also be formed on the outer peripheral surface of the second transmission member 220, and the sliding member 221 can also be disposed on the inner wall of the cavity portion 130. When the second transmission member 220 rotates about the rotation axis L1, the limiting sliding groove 131 can slide relative to the sliding member 221, thereby realizing the limiting function.
[0088] It can be understood that in the embodiments of the present application, the number of the limiting sliding grooves 131 and the number of the sliding members 221 are matched, or the same. For example, the number of both can be set to one, two, three, etc. Among them, the multiple limiting sliding grooves 131 and the multiple sliding members 221 correspond to each other one by one.
[0089] For example Figure 8A and Figure 8B As shown, the number of the limiting sliding grooves 131 can be two. The two limiting sliding grooves 131 are arranged at intervals around the B direction. Correspondingly, the number of the sliding members 221 can also be two. And the two sliding members 221 correspond to the two limiting sliding grooves 131 one by one. The end portions of the respective sliding members 221 are respectively located in the corresponding limiting sliding grooves 131. When the number of the limiting sliding grooves 131 and the sliding members 221 are both set to two, the acting force for limiting the rotation of the second transmission member 220 can be effectively increased, thereby improving the reliability of the limiting of the limiting sliding groove 131.
[0090] It can be understood that the above Figure 8A and Figure 8B only schematically show the internal shape of the cavity portion 130 of the support base 100. In other embodiments, the cavity portion 130 of the support base 100 can also have other shapes, and the present application does not limit this, as long as it does not interfere with the normal movement of the second transmission member 220 in the cavity portion 130.
[0091] To reduce the rotational damping between the second transmission member 220 and the inner wall of the cavity portion 130 during rotation, in some embodiments of the present application, along the Z direction, the fit between the second transmission member 220 located inside the cavity portion 130 and the inner wall of the cavity portion 130 is a rolling friction fit.
[0092] Specifically, Figure 9 shows a partial enlarged view of the driving device 30 in the Figure 3B S1 region in the present application embodiment. Refer to Figure 9 and in combination with Figure 8A and Figure 8BWhen the second transmission member 220 is located inside the cavity portion 130, its end face 222 is opposite to the inner wall 132 of the cavity portion 130 in the Z direction. A ball 223 is provided on the end face 222 of the second transmission member 220. The ball 223 can effectively reduce the friction between the end face 222 of the second transmission member 220 and the inner wall 132 of the cavity portion 130, thereby reducing the rotational damping of the second transmission member 220 and making the rotation of the second transmission member 220 smoother.
[0093] In some embodiments of the present application, the number of balls 223 can be multiple to further reduce the friction between the end face 222 of the second transmission member 220 and the inner wall 132 of the cavity portion 130. Exemplarily, the multiple balls 223 can be symmetrically distributed about the rotation axis L1 on the end face 222 of the second transmission member 220 to ensure the uniformity of the force on the end face 222 of the second transmission member 220.
[0094] In some embodiments of the present application, a roller can also be provided between the end face 222 of the second transmission member 220 and the inner part 132 of the cavity portion 130, such as a cylindrical roller, a tapered roller, a spherical roller, etc., so that the fit between the second transmission member 220 and the inner wall of the cavity portion 130 is a rolling friction fit.
[0095] In some embodiments of the present application, a substance such as lubricating oil that helps reduce friction can also be applied between the end face 222 of the second transmission member 220 and the inner part 132 of the cavity portion 130 to further reduce the rotational damping of the second transmission member 220.
[0096] To enable the drive device 30 to reset from the working state to the initial state, in some embodiments of the present application, a reset groove is further provided on the support base 100. By the cooperation of the rotating rod and the reset groove, the second transmission member 220 can be returned to the second position again, and further the drive device 30 is reset to the initial state.
[0097] Specifically, Figure 10 shows a schematic diagram of the drive device 30 resetting from the working state to the initial state in the embodiments of the present application. Refer to Figure 10 In, a reset groove 140 is provided on the support base 100. The reset groove 140 communicates with the cavity portion 130 inside the support base 100 and the outside of the support base 100.
[0098] First, insert the second transmission member 220 into the cavity portion 130 through the opening portion 120. Then, insert the rotating rod 400 through the reset groove 140 from the outside of the support base 100 into the cavity portion 130 inside the support base 100, and connect it to the second transmission member 220. For example, the rotating rod 400 is inserted into the second transmission member 220. Next, rotate the rotating rod 400 in the C direction. During the rotation of the rotating rod 400 in the C direction, the second transmission member 220 can be driven to reset to the second position. At this time, the elastic member (not shown) is in a compressed state. Finally, clamp the second transmission member 220 through a clamping mechanism (not shown) so that the second transmission member 220 can be fixed in the second position, the elastic member remains in the compressed state, and further the driving device 30 can be maintained in the initial state.
[0099] Figure 11A FIG. 4 shows a schematic structural view of the lifting mechanism 200 in the driving device 30 according to an embodiment of the present application, where Figure 11A FIG. 5 is a perspective view of the lifting mechanism 200, Figure 11B FIG. 6 is a cross-sectional view of the lifting mechanism 200 along the Figure 11A A-A cross-section in FIG. 4.
[0100] Referring to Figure 11A and Figure 11B , in some embodiments of the present application, the first transmission member 210 of the lifting mechanism 200 is a ball screw, extending in the Z direction. The second transmission member 220 is a lead screw nut. The first transmission member 210 and the second transmission member 220 are in a threaded fit. In this way, the second transmission member 220 can rotate around the first transmission member 210 under the action of gravity and move relative to the first transmission member 210 in the Z direction at the same time.
[0101] Based on this, when the second transmission assembly 220 is released by the clamping mechanism 300, under the elastic force of the elastic member 230, the first transmission member 210 can move away from the support base 100 along a predetermined trajectory (for example, the Z direction), so that the pop-up trajectory of the engine hood (for example, the engine hood 02 in the above Figure 1 ) is controllable.
[0102] In some embodiments of the present application, the second end 210B of the first transmission member 210 includes a second stop portion 211B. The second stop portion 211B is similar to a disc shape. The second stop portion 211B is used to limit the movement of the second transmission member 220 in the Z direction to ensure that the second transmission member 220 does not come out of the first transmission member 210.
[0103] In some embodiments of the present application, along the Z direction, when the second transmission member 220 is fixed in the second position by the clamping mechanism 300, there is a second gap G2 between the second transmission member 220 and the second stop portion 211B. In this way, it can be ensured that the second transmission member 220 has sufficient axial (for example, Z direction) movement stroke, and further ensure that the second transmission assembly 220 has sufficient rotation stroke to be able to switch between the first position and the second position.
[0104] It can be understood that the second gap G2 is related to the thread parameters (e.g., pitch, thread angle, number of threads, etc.) of the first transmission member 210. In this embodiment, the second gap G2 can be greater than 0 mm and less than or equal to 5 mm. For example, the second gap G2 can be 0.5 mm, 1 mm, 2 mm, 5 mm, etc.
[0105] In other embodiments, the first transmission member 210 and the second transmission member 220 may also be implemented in other ways. For example, the first transmission member 210 may be a transmission shaft extending along the Z direction, and the second transmission member 220 may be a gear, and the second transmission member 220 is driven by a driving member (for example, a motor) to rotate around the first transmission member 210, and the present application does not limit this.
[0106] In some embodiments of the present application, the elastic member 230 includes a spring 231. When the elastic member 230 is in a compressed state, two ends of the spring 231 abut against the first stopper 211A of the first transmission member 210 and the first surface 110 of the support base 100, respectively.
[0107] In some implementations, the spring 231 may be a coil spring, and the coil spring may be spirally wound around the outer circumference of the first transmission member 210. Alternatively, in other alternative implementations, the spring 231 may also be a torsion spring, a disc spring, an annular spring, a spiral spring, or other types of springs, which are not limited in the present application, as long as the elastic force requirements of actual use can be met.
[0108] In other embodiments, the number of springs 231 may also be multiple to further increase the elastic force. For example, the multiple springs 231 may be arranged in a ring array or a rectangular array around the outer circumference of the first transmission member 210, and the present application does not limit this.
[0109] Continue reading Figure 3A , Figure 4A and Figure 5A In some embodiments of the present application, the clamping mechanism 300 includes a driving member 310 and a clamping member 320. The driving member 310 is connected to the clamping member 320.
[0110] Among them, the driving member 310 can drive the clamping member 320 to translate in the X direction (as an example of the first direction) so that the clamping member 320 can reach or move away from the clamping position of the second transmission member 220. For example Figure 3A As shown, in the X direction, the driving member 310 drives the clamping member 320 to translate close to the second transmission member 220. At this time, the clamping member 320 enters the inside of the support base 100 and clamps the second transmission member 220, and the second transmission member 220 is fixed at the second position. Another example is to refer to Figure 4A and Figure 5A , in the X direction, the driving member 310 drives the clamping member 320 to translate away from the second transmission member 220. At this time, the clamping member 320 is withdrawn from the inside of the support base 100, thereby releasing the second transmission member 220. The second transmission member 220 can rotate around the first transmission member 310, so as to reach the first position.
[0111] In some embodiments of the present application, the driving member 310 can be a linear motor. When the driving device 30 is in Figure 3A the initial state shown, the linear motor makes the clamping member 320 in a state of clamping the second transmission member 220. When the driving device 30 needs to enter Figure 4A and Figure 5A the working states shown, the linear motor is powered on to drive the clamping member 320 to move away from the second transmission member 220 in the X direction to release the second transmission member 220.
[0112] Alternatively, in other alternative embodiments, the driving member 310 can also be a cylinder. The present application does not make specific limitations on this, as long as it can drive the second transmission member 220 to translate in the X direction.
[0113] In some embodiments of the present application, the clamping member 320 and the second transmission member 220 are matched by mutually engaging protrusions and grooves, so as to fix the second transmission member 220 at the second position. Exemplarily, continue to refer to Figure 8A and Figure 8B , a groove 321 is formed on the clamping member 320 to cooperate with the protrusion F2 of the second transmission member 220. When the groove 321 of the clamping member 320 abuts against the protrusion F2 of the second transmission member 220, the groove 321 will limit the rotation of the protrusion F2, thereby fixing the second transmission member 220 at the second position and preventing it from rotating around the rotation axis L1.
[0114] In some embodiments of the present application, uneven patterns (such as herringbone patterns) can also be provided on the two surfaces where the protrusion F2 and the groove 321 are in contact. These uneven patterns can increase the resistance to relative sliding between the protrusion F2 and the groove 321, thereby further improving the reliability of the cooperation between the protrusion F2 and the groove 321.
[0115] It can be understood that Figure 8A and Figure 8B only shows the cooperation mode of part of the clamping member 320 and the second transmission member 220, and does not constitute a specific limitation on the implementation mode of the present application. For example, in some other embodiments of the present application, the clamping member 320 may further include a pin extending along the X direction, and a pin hole adapted to the pin is provided on the second transmission member 220. When the driving member 310 drives the clamping member 320 to approach the second transmission member 220, the pin can be inserted into the pin hole, so as to fix the second transmission member 220 at the second position. For another example, the first clamping member 320 may also be a mechanical claw. When the driving member 310 drives the clamping member 320 to approach the second transmission member 220, the mechanical claw can grab the second transmission member 220, so as to fix the second transmission member 220 at the second position.
[0116] Continuing to refer to Figures 1 to 5B , the present application further provides an engine hood system, which includes an engine hood 02 and any one of the above-mentioned driving devices 30. The first end 210A of the first transmission member 210 of the driving device 30 is connected to the engine hood 02. When the second transmission member 220 is in the first position, under the elastic force of the elastic member 230, the first transmission member 210 moves in a direction away from the support seat 100, so as to lift the engine hood 02.
[0117] The present application further provides a pedestrian protection device, which includes a collision sensing module 10, a control module 20 and a driving device 30. When the vehicle 1 collides with a pedestrian, the collision sensing module 10 detects a collision event of the engine hood 02, and then generates a collision signal based on the collision event and transmits the collision signal to the control module 20. After receiving the collision signal, the control module 20 issues an instruction to the driving device 30 to control the clamping mechanism 300 of the driving device 30 to release the second transmission member 220, so that the first transmission member 210 can lift the engine hood 02, thereby forming a certain buffer space to reduce the injury of the pedestrian's head and play a role in protecting the pedestrian.
[0118] The present application further provides a vehicle, which includes any one of the above-mentioned driving devices 30, which will not be elaborated here.
[0119] It can be understood that the above-mentioned driving device is applied to a vehicle, but the present application is not limited thereto. In other embodiments, the driving device can also be applied to other forms of devices, such as smart home devices (for example, smart electric doors), smart security devices (for example, access control systems), etc. that need to be opened, closed or lifted.
[0120] The above specific embodiments illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Although the description of the present application will be introduced in combination with some embodiments, this does not mean that the features of this application are limited to this implementation manner. On the contrary, the purpose of introducing the application in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present application. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscuring the key points of the present application, some specific details are omitted in the description. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0121] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "outer", "inner", "circumferential", "radial", "axial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0122] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "fitted" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.
[0123] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.
Claims
1. A driving device, characterized in that, It includes a support base, a lifting mechanism and a clamping mechanism provided on the support base, where: The lifting mechanism includes a first transmission member, a second transmission member and an elastic member. The first transmission member is disposed through the second transmission member. The first transmission member includes a first end and a second end. Among them, The first end includes a first stop portion. The second end extends through the first surface of the support base to the inside of the support base. And when the elastic member is in a compressed state, the first stop portion contacts one end of the elastic member, and the first surface contacts the other end of the elastic member; The second transmission member is positioned near the second end. And the second transmission member can rotate around the first transmission member to a first position inside the support base. When the second transmission member rotates around the first transmission member to the first position, under the elastic force of the elastic member, the first transmission member moves in a direction away from the support base; The clamping mechanism is used to clamp the second transmission member to fix the second transmission member at a second position and prevent it from rotating around the first transmission member.
2. The drive device according to claim 1, characterized in that, The clamping mechanism includes a driving member and a clamping member. The driving member is used to drive the clamping member to translate in a first direction. The first direction is perpendicular to the rotation axis of the second transmission member. The clamping member is used to clamp the second transmission member.
3. The drive device according to claim 2, characterized in that, A convex portion protruding away from the second transmission member in the first direction is formed on the outer peripheral surface of the second transmission member. A groove matching the convex portion is provided on the clamping member.
4. The drive device according to claim 1, characterized in that, An opening portion is provided on the first surface of the support base. The opening portion communicates the inside and the outside of the support base. The second end of the first transmission member extends from the outside of the support base to the inside of the support base through the opening portion; The opening portion is matched with the outer peripheral surface of the second transmission member. And when the second transmission member rotates around the first transmission member to the first position inside the support base, there is a first gap between the inner wall of the opening portion and the outer peripheral surface of the second transmission member in a direction perpendicular to the rotation axis of the second transmission member.
5. The drive device according to claim 1, characterized in that, The inside of the support base includes a cavity portion. The second transmission member can rotate around the first transmission member in the cavity portion; A limiting sliding groove is provided on one of the inner wall of the cavity portion and the outer peripheral surface of the second transmission member. A sliding member is provided on the other surface. The sliding member extends in a direction perpendicular to the rotation axis of the second transmission member, and the end of the sliding member is located in the limiting sliding groove.
6. The drive device according to claim 5, characterized in that The relative sliding stroke of the limiting sliding groove and the sliding member is the length of the intersection line of the first sector region and the plane where the limiting sliding groove is located. The center of the first sector region coincides with the rotation axis of the second transmission member. The central angle of the first sector region is the rotation angle of the second transmission member rotating around the first transmission member from the second position to the first position.
7. The drive device according to claim 1, characterized in that, Along the extending direction of the rotation axis of the second transmission member, the end face of the second transmission member disposed inside the support base faces the inner wall inside the support base, and the fit between the end face of the second transmission member and the inner wall inside the support base is a rolling friction fit.
8. The drive device according to claim 7, characterized in that, Ball beads or rollers are provided on the end face of the second transmission member.
9. The drive device according to claim 1, characterized in that The first transmission member is a ball screw, the second transmission member is a lead screw nut, the ball screw is disposed through the lead screw nut, the second end of the ball screw includes a second stop portion, and when the lead screw nut is fixed at the second position along the extending direction of the lead screw, there is a second gap between the lead screw nut and the second stop portion, so that the lead screw nut can rotate from the second position to the first position.
10. The drive device according to claim 1, characterized in that, The elastic member includes a spring. When the elastic member is in a compressed state, one end of the spring contacts the first stop portion of the first transmission member, and the other end of the spring contacts the first surface of the support base.
11. The drive device according to claim 10, characterized in that, The spring is a helical spring, and the helical spring is helically wound around the outer periphery of the first transmission member.
12. The drive device according to claim 1, characterized in that A reset groove is formed in the support base, the reset groove communicates the inside and the outside of the support base, and the driving device further includes a rotating rod; When the second transmission member is located inside the support base, the rotating rod is inserted into the inside of the support base from the outside of the support base through the reset groove and is connected to the second transmission member located inside the support base for driving the second transmission member to rotate around the first transmission member to the second position.
13. The drive device according to claim 2, characterized in that, The driving member is a linear motor.
14. An engine hood system, characterized in that, It includes an engine hood and the driving device according to any one of claims 1 to 13. The first end of the first transmission member is connected to the engine hood. When the second transmission member rotates around the first transmission member to the first position, the first transmission member lifts the engine hood away from the support base under the elastic force of the elastic member.
15. A pedestrian protection device, characterized in that, It includes a collision signal sensing module, a control module and the driving device according to any one of claims 1 to 13. The collision signal sensing module is configured to generate a collision signal based on a detected collision event and transmit the collision signal to the control module. The control module is configured to send an instruction to the driving device after receiving the collision signal, and the instruction is used to control the clamping mechanism of the driving device to release the second transmission member.
16. A vehicle, characterized in that, It includes a vehicle body, an engine hood and the driving device according to any one of claims 1 to 13. The engine hood and the driving device are disposed on the vehicle body. The first end of the first transmission member is connected to the engine hood. When the second transmission member rotates around the first transmission member to the first position, the first transmission member lifts the engine hood away from the support base under the elastic force of the elastic member.