Passenger car active opening and closing hub cover device

Abstract

The present invention provides an active opening and closing wheel hub cover device for a passenger car, which belongs to the field of automobile aerodynamics technology. It includes a base plate, a blade, and a cover plate. A rotating block is provided at the center of the base plate near the cover plate, and a first torque spring is provided between the rotating block and the base plate; a pair of ratchet sliders are provided at the base plate near the cover plate, and the ratchet sliders are both provided with movable ratchets, and a telescopic part is provided between the ratchet sliders and the movable ratchets; a blade is provided at the base plate near the cover plate, and a right-angled boss is fixedly installed on the ratchet boss of the base plate, a tension spring is fixedly installed between the ratchet slider and the right-angled boss, a fixed magnet is fixedly installed on the right-angled boss near the ratchet boss of the base plate, and a second torque spring is provided between the blade and the cover plate. The device has a compact and stable structure, high mechanical reliability, does not require additional driving devices and control devices, has high space utilization, and has low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile aerodynamics, and in particular relates to an active opening and closing hub cover device for a passenger car. Background Art

[0002] With the rapid development of my country's automobile industry and related technologies, the performance of automobiles has been greatly enhanced, and the speed of automobiles has also increased significantly. The forces and torques caused by air action have an increasingly greater impact on various indicators of automobile driving. In order to ensure the safety and fuel economy of automobile driving, modern automobiles have put forward higher requirements for the air resistance encountered by vehicles when driving at high speeds.

[0003] Using closed wheel hubs is a common method to reduce the drag coefficient of a car, but closed wheel hubs are often used in new energy vehicles that rely on motor energy recovery braking. The braking system of traditional fuel vehicles will generate a lot of heat during braking, and closed wheel hubs will limit the ventilation conditions of the wheel braking system. Therefore, traditional fuel vehicles are not suitable for closed wheel hubs.

[0004] Under the premise of taking into account the heat dissipation efficiency of the braking system, how to reduce the drag coefficient of the entire fuel vehicle is a problem that the present invention needs to solve. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an active opening and closing wheel hub cover device for a passenger vehicle.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a passenger car active opening and closing wheel hub cover device, comprising a base plate, a blade, and a cover plate, wherein the base plate and the cover plate are respectively arranged on both sides of the blade, and the base plate and the cover plate are respectively circumferentially opened with a plurality of base plate fan ring through holes and a plurality of cover plate fan ring through holes, and the base plate, the blade and the cover plate are coaxially arranged, the base plate and the cover plate are fixedly mounted on the automobile wheel hub, a cylindrical boss is installed on the side of the base plate close to the cover plate, the inner wall of the blade is rotatably mounted on the cylindrical boss, and the cylindrical boss is installed with a base plate. The ratchet boss of the plate, the two ends of the ratchet boss of the bottom plate are provided with sliding grooves, the ratchet slider is provided on the side of the bottom plate close to the cover plate, the ratchet slider is slidably connected with the sliding groove, the ratchet boss of the bottom plate is rotatably installed with a rotating block close to the cover plate, a first torque spring is fixedly installed between the rotating block and the ratchet boss of the bottom plate, the ratchet slider is provided with a slider inner groove on the side away from the first torque spring, a movable ratchet is slidably installed in the slider inner groove, a telescopic member is installed between the slider inner groove and the movable ratchet, and the movable ratchet is in contact with the inner side surface of the blade;

[0007] The blade is rotatably connected to the cover plate, a second torsion spring is fixedly installed between the blade and the cover plate, right-angle bosses are fixedly installed between the two sides of the ratchet boss of the bottom plate and the cylindrical boss, a tension spring is fixedly installed between the side of the right-angle boss close to the ratchet slider and the ratchet slider, a fixed magnet is fixedly installed on the side of the right-angle boss close to the ratchet boss of the bottom plate, and the rotating block is made of magnetic material.

[0008] As a further improvement, a plurality of ratchet inner teeth are provided on the inner side surface of the blade, and the ratchet inner teeth are in abutting connection with the movable ratchet teeth.

[0009] As a further improvement scheme: the telescopic part includes a first ratchet magnet and a second ratchet magnet, and the first ratchet magnet and the second ratchet magnet are fixedly installed on the two ends of the inner groove of the slider close to the movable ratchet, and the first ratchet magnet and the second ratchet magnet repel each other.

[0010] As a further improvement: when the rotating block is in contact with the side of the right-angle boss where the fixed magnet is not installed, the first torsion spring is at its minimum deformation; when the rotating block is in contact with the side of the right-angle boss where the fixed magnet is installed, the first torsion spring reaches its maximum deformation.

[0011] As a further improvement: when the blade completely covers the base fan ring through hole, the second torsion spring is at the minimum deformation; when the blade completely reveals the base fan ring through hole, the second torsion spring reaches the maximum deformation.

[0012] As a further improvement, when the inner arc of the slider fits with the right-angle boss, the tension spring is at its minimum deformation; when the outer arc of the slider fits with the cylindrical boss, the tension spring is at its maximum deformation.

[0013] As a further improvement: when the car brakes, if the ratchet slider is not in contact with the cylindrical boss, the rotating block rotates relative to the base plate due to the inertial force, and the rotating block pushes the ratchet slider along the slide toward the cylindrical boss. When the ratchet slider is fully in contact with the cylindrical boss, the car's braking acceleration meets the critical condition:

[0014] (M1-M k1 )cosα1=2(F k2 -F1)r1;

[0015]

[0016] M k1 =Δθ1K1;

[0017] F k2 =Δxk1;

[0018] F1=m1w 2 L1

[0019] Where M1 is the torque generated by the inertia of the rotating block, J1 is the moment of inertia of the rotating block, d is the wheel diameter, a1 is the critical acceleration of the ratchet slider and the cylindrical boss; M k1 is the torque generated by the deformation of the first torsion spring, Δθ1 is the deformation of the first torsion spring, K1 is the elastic modulus of the first torsion spring; α1 is the rotation angle of the rotating block compared to the rotation position; F k2 is the pulling force of the tension spring on the ratchet slider, Δx is the deformation of the tension spring, k1 is the elastic modulus of the tension spring; F1 is the centrifugal force acting on the ratchet slider, telescopic member and movable ratchet, m1 is the total mass of the ratchet slider, telescopic member and movable ratchet, w is the angular velocity of the base plate, L1 is the distance between the center of mass and the center of rotation of the ratchet slider, telescopic member and movable ratchet.

[0020] As a further improvement: when the car stops braking, if the ratchet slider fits into the cylindrical boss, the ratchet slider is pushed by the tension spring to rotate the rotating block away from the fixed magnet. When the rotating block is completely in contact with the right-angle boss, the car's braking acceleration meets the critical condition:

[0021] (M2+2M c -M k1 )cosα1=2(F k2 -F1)r1;

[0022]

[0023] M k1 =ΔθK1;

[0024] F k2 =Δxk1;

[0025] F1=m1w 2 L1;

[0026] Where M2 is the torque generated by the rotating block due to inertia, a2 is the critical acceleration of the ratchet slider and the right-angle boss; M c The fixed magnet generates a torque on the rotating block by magnetic force.

[0027] As a further improvement: when the car brakes, if the blades are in the closed state, the blades rotate relative to the base plate due to the inertial force, and the base plate fan ring through-holes and the cover plate fan ring through-holes are exposed. At this time, the car's braking acceleration meets the critical condition:

[0028] M3=M k2 ;

[0029]

[0030] M k2 =Δθ2K2;

[0031] Where M3 is the moment of inertia of the blade, J2 is the moment of inertia of the blade, d is the wheel diameter, and a3 is the critical acceleration of the blade relative to the base plate due to the inertial force. k2 is the torque generated by the deformation of the second torsion spring, Δθ2 is the deformation amount of the second torsion spring, and K2 is the elastic modulus of the second torsion spring.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] By providing a ratchet mechanism, the blades can only be closed under specific conditions after opening, ensuring that the blades have sufficient opening time, thereby ensuring the ventilation effect of the hub cover; the opening and closing power source of the hub cover is the inertia force of the car's rotation, and the second torque spring is used to generate torque as the power source for closing the blades. The device has a compact structure and high space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 An exploded view from one side of a passenger vehicle active opening and closing hub cover device provided by an embodiment of the present invention;

[0035] Figure 2 An exploded view from another side of an active opening and closing hub cover device for a passenger vehicle provided by an embodiment of the present invention;

[0036] Figure 3 A schematic structural diagram of the central area of ​​a device for actively opening and closing a hub cover for a passenger vehicle provided by an embodiment of the present invention;

[0037] Figure 4 A schematic structural diagram of a ratchet slider in an active opening and closing hub cover device for a passenger vehicle provided by an embodiment of the present invention;

[0038] Figure 5 A schematic structural diagram of the center area of ​​a bottom plate in an active opening and closing hub cover device for a passenger vehicle provided by an embodiment of the present invention;

[0039] Figure 6 A schematic structural diagram of a rotating block in an active opening and closing hub cover device for a passenger vehicle provided by an embodiment of the present invention;

[0040] Figure 7 The present invention provides a structural intention of blades in an active opening and closing hub cover device for a passenger vehicle.

[0041] Figure 8The present invention provides a structural intention of a cover plate in an active opening and closing hub cover device for a passenger vehicle.

[0042] In the figure: 1, bottom plate; 11, first threaded hole; 12, bottom plate ring; 13, bottom plate spoke; 14, clamping plate; 15, cylindrical boss; 16, right-angle boss; 17, first spring hole; 18, bottom plate fan ring through hole; 19, slide groove; 110, bottom plate ratchet boss; 111, first spring ring groove; 112, center cylinder; 2, cover plate; 21, second threaded hole; 22, fourth spring ring groove; 23, cover plate ratchet boss; 24, center hole; 25, Cover plate fan ring through hole; 3. Rotating block; 31. Arc surface; 32. Second spring ring groove; 33. Circular through hole; 4. Second torque spring; 5. Tension spring; 6. Ratchet slider; 61. Slider inner groove; 62. Slider guide block; 63. Slider inner arc; 64. Slider outer arc; 7. First ratchet magnet; 8. Second ratchet magnet; 9. Movable ratchet; 91. Ratchet guide block; 10. Blade; 101. Third spring ring groove; 102. Ratchet inner teeth. DETAILED DESCRIPTION

[0043] The technical solution of the present application will be further described in detail below in conjunction with specific implementation methods.

[0044] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0045] See also Figures 1 to 8In one embodiment, a passenger car active opening and closing wheel hub cover device includes a base plate 1, a blade 10, and a cover plate 2, wherein the base plate 1 and the cover plate 2 are respectively arranged on both sides of the blade 10, and the base plate 1 and the cover plate 2 are respectively circumferentially opened with a plurality of base plate fan ring through holes 18 and a plurality of cover plate fan ring through holes 25, and the base plate 1, the blade 10 and the cover plate 2 are coaxially arranged, and the base plate 1 and the cover plate 2 are fixedly mounted on the automobile wheel hub, and a cylindrical boss 15 is installed on the side of the base plate 1 close to the cover plate 2, and the inner wall of the blade 10 is rotatably mounted on the cylindrical boss 15, and the cylindrical boss 15 is installed with a base plate ratchet boss 110, and the base plate ratchet boss 110 Slide grooves 19 are provided at both ends, and a ratchet slider 6 is provided on the side of the bottom plate 1 close to the cover plate 2. The ratchet slider 6 is slidably connected to the slide groove 19. A central cylinder 112 is fixedly installed at the axis of the ratchet boss 110 of the bottom plate close to the cover plate 2. A rotating block 3 is rotatably installed on the central cylinder 112. A first torque spring is fixedly installed between the rotating block 3 and the bottom plate 1. A slider inner groove 61 is provided on the side of the ratchet slider 6 away from the central cylinder 112. A movable ratchet 9 is slidably installed on the slider inner groove 61. A telescopic member is installed between the slider inner groove 61 and the movable ratchet 9, and the movable ratchet 9 is in contact with the inner side of the blade 10.

[0046] The blade 10 is rotatably connected to the cover plate 2, and a second torsion spring 4 is fixedly installed between the blade 10 and the cover plate 2. A right-angle boss 16 is fixedly installed between the two sides of the bottom plate ratchet boss 110 and the cylindrical boss 15. A tension spring 5 is fixedly installed between the side of the right-angle boss 16 close to the ratchet slider 6 and the side of the ratchet slider 6 close to the right-angle boss 16. A fixed magnet is fixedly installed on the side of the right-angle boss 16 close to the bottom plate ratchet boss 110, and the rotating block 3 is made of magnetic material.

[0047] In this embodiment, a bottom plate ring 12 is installed on the side of the bottom plate 1 close to the cover plate 2, and bottom plate spokes 13 are fixedly installed on both sides of the bottom plate fan ring through hole 18. When the blade 10 completely covers the position of the bottom plate fan ring through hole 18, the blade 10 remains in contact with the bottom plate spoke 13 and the bottom plate ring 12, thereby realizing the overall processing closed state of the device. A number of clamping plates 14 are fixedly installed on the bottom plate 1, and the bottom plate 1 is fixedly mounted on the automobile wheel hub through the clamping plates 14. A number of first threaded holes 11 are opened circumferentially on the bottom plate 1, and a number of second threaded holes 21 are opened circumferentially on the cover plate 2. The first threaded holes 11 and the second threaded holes 21 are arranged corresponding to each other, and the first threaded holes 11 and the second threaded holes 21 are connected to each other by screws, thereby realizing the connection and fixation of the bottom plate 1 and the cover plate 2.

[0048] The slider guide blocks 62 are fixedly installed on both sides of the ratchet slider 6, and the slider guide blocks 62 on one side of the ratchet slider 6 are slidably connected to the slide groove 19. The bottom plate ratchet boss 110 is fixedly installed with a center cylinder 112 at the axis of the cover plate 2 side. The cover plate 2 is fixedly installed with a cover plate ratchet boss 23 on the side close to the bottom plate 1. The slider guide blocks 62 on the other side of the ratchet slider 6 are slidably connected to the cover plate ratchet boss 23. A center circular hole 24 is opened on the cover plate ratchet boss 23, and a circular through hole 33 is opened on the rotating block 3. The center cylinder 11 2 passes through the circular through hole 33, one end of the central cylinder 112 is located in the central circular hole 24, and the central cylinder 112 is rotatably connected to the circular through hole 33 and the central circular hole 24. The ratchet boss 110 of the bottom plate is provided with a first spring ring groove 111 on the side close to the cover plate 2, and the rotating block 3 is provided with a second spring ring groove 32 on the side close to the bottom plate 1. A first torsion spring is fixedly installed between the second spring ring groove 32 and the first spring ring groove 111, and both ends of the first torsion spring are respectively fixedly connected to the bottom ends of the first spring ring groove 111 and the second spring ring groove 32;

[0049] A third spring ring groove 101 is provided on the side of the blade 10 close to the cover plate 2, and a fourth spring ring groove 22 is provided on the side of the cover plate 2 close to the blade 10. Both ends of the second torsion spring 4 are fixedly connected to the bottom ends of the third spring ring groove 101 and the fourth spring ring groove 22 respectively. A right-angle boss 16 is fixedly installed between the two sides of the ratchet boss 110 of the bottom plate and the cylindrical boss 15. A first spring hole 17 is provided on the right-angle boss 16 close to the ratchet slider 6. A second spring hole is provided on the ratchet slider 6 close to the right-angle boss 16. A tension spring 5 is fixedly installed between the first spring hole 17 and the second spring hole. A magnet groove is provided on the right-angle boss 16 close to the ratchet boss 110 of the bottom plate, and a fixed magnet is installed in the magnet groove. The bottom plate 1 is made of non-magnetic material, and the rotating block 3 is made of magnetic material.

[0050] When the car is stationary and traveling at a constant speed, the blades 10 are always kept in contact with the bottom plate spokes 13 and the bottom plate ring 12 by the action of the second torque spring 4, the fan ring through hole is closed, and the entire device is in a closed state.

[0051] When the car starts to brake, the base plate 1, the fixed magnet, the tension spring 5, the ratchet slider 6, the first ratchet magnet 7, the second ratchet magnet 8 and the cover plate 2 rotate with the wheel at a reduced speed. Under the action of inertia, the rotating block 3 rotates relative to the base plate 1. The rotating block 3 presses the ratchet slider 6, causing it to move linearly along the slide groove 19 toward the cylindrical boss 15, and finally the ratchet slider 6 fits with the cylindrical boss 15, and the movable ratchet 9 extends. At the same time, under the action of inertia, the blade 10 also rotates relative to the base plate 1, thereby realizing the opening of the blade 10. At this time, the airflow inside and outside the spokes flows freely, and the airflow through the brake increases, thereby dissipating heat from the braking system.

[0052] When the car stops braking, the sum of the inertia moment of the rotating block 3 and the torque provided by the fixed magnet is less than the return torque of the first torque spring. The ratchet slider 6 moves linearly along the slide groove 19 toward the center of rotation under the action of the tension spring 5 until it fits with the right-angle boss 16. At this time, the movable ratchet 9 contracts and no longer contacts the inner side of the blade 10. The blade 10 closes unobstructed and completes the closing under the action of the second torque spring 4. At this time, the hub cover isolates the momentum exchange of the airflow inside and outside the spoke, and the aerodynamic resistance of the entire vehicle is reduced.

[0053] See also Figure 6 In one embodiment, arc surfaces 31 are provided at both ends of the rotating block 3. The provision of the arc surfaces 31 can make the contact with the ratchet slider 6 smoother and reduce resistance.

[0054] See also Figure 7 In one embodiment, a plurality of ratchet inner teeth 102 are provided on the inner side of the blade 10 , and the ratchet inner teeth 102 are in contact with the movable ratchet teeth 9 .

[0055] In this embodiment, ratchet guide blocks 91 are provided at both ends of the movable ratchet 9. The ratchet guide blocks 91 can perform linear motion with restrictions at both ends in the inner groove 61 of the slider. The ratchet inner teeth 102 cooperate with the movable ratchet 9. When the ratchet inner teeth 102 are engaged with the movable ratchet 9, the blade 10 can only rotate in one direction. When the ratchet inner teeth 102 are disengaged from the movable ratchet 9, the blade 10 can rotate in both directions.

[0056] See also Figure 4 In one embodiment, the telescopic member includes a first ratchet magnet 7 and a second ratchet magnet 8, and the first ratchet magnet 7 and the second ratchet magnet 8 are fixedly installed at both ends of the slider inner groove 61 close to the movable ratchet 9, and the first ratchet magnet 7 and the second ratchet magnet 8 repel each other.

[0057] In this embodiment, the telescopic member may also be implemented by a spring, and is not limited to the structure of the first ratchet magnet 7 and the second ratchet magnet 8 .

[0058] See also Figure 4 In one embodiment, when the rotating block 3 is in contact with the side of the right-angle boss 16 where the fixed magnet is not installed, the first torsion spring is in minimum deformation; when the rotating block 3 is in contact with the side of the right-angle boss 16 where the fixed magnet is installed, the first torsion spring reaches maximum deformation.

[0059] See also Figure 1 、 Figure 2 In one embodiment, when the blade 10 completely covers the base fan ring through hole, the second torsion spring 4 is in minimum deformation; when the blade 10 completely exposes the base fan ring through hole, the second torsion spring 4 reaches maximum deformation.

[0060] See also Figure 3 In one embodiment, when the inner arc 63 of the slider fits with the right-angle boss 16, the tension spring 5 is in minimum deformation; when the outer arc 64 of the slider fits with the cylindrical boss 15, the tension spring 5 is in maximum deformation.

[0061] In this embodiment, the ratchet slider 6 includes a slider inner arc 63 and a slider outer arc 64 .

[0062] In one embodiment, when the vehicle brakes, if the ratchet slider 6 is not in contact with the cylindrical boss 15, the rotating block 3 rotates relative to the base plate 1 due to the inertial force, and the rotating block 3 pushes the ratchet slider 6 to move along the slide groove 19 toward the cylindrical boss 15. When the ratchet slider 6 is fully in contact with the cylindrical boss 15, the vehicle braking acceleration meets the critical condition:

[0063] (M1-M k1 )cosα1=2(F k2 -F1)r1;

[0064]

[0065] M k1 =Δθ1K1;

[0066] F k2 =Δxk1;

[0067] F1=m1w 2 L1;

[0068] Wherein, M1 is the torque generated by the inertia of the rotating block 3, J1 is the moment of inertia of the rotating block 3, d is the wheel diameter, a1 is the critical acceleration of the ratchet slider 6 and the cylindrical boss 15; M k1is the torque generated by the deformation of the first torsion spring, Δθ1 is the deformation of the first torsion spring, K1 is the elastic modulus of the first torsion spring; α1 is the rotation angle of the rotating block 3 compared to the rotation position; F k2 is the pulling force of the tension spring 5 on the ratchet slider 6, Δx is the deformation of the tension spring 5, k1 is the elastic modulus of the tension spring 5; F1 is the centrifugal force acting on the ratchet slider 6, the telescopic part and the movable ratchet 9, m1 is the total mass of the ratchet slider 6, the telescopic part and the movable ratchet 9, w is the angular velocity of the base plate 1, and L1 is the distance between the center of mass and the center of rotation of the ratchet slider 6, the telescopic part and the movable ratchet 9.

[0069] Since the two groups of ratchet sliders 6, telescopic parts and movable ratchets 9 are centrally symmetrically distributed around the rotation center, the torques caused by weight cancel each other out, while the friction generated by the movement of the rotating block 3, ratchet sliders 6, telescopic parts and movable ratchets 9 is ignored.

[0070] In one embodiment, when the vehicle stops braking, if the ratchet slider 6 is in contact with the cylindrical boss 15, the ratchet slider 6 is pushed by the tension spring 5 to rotate the rotating block 3 away from the fixed magnet. When the rotating block 3 is completely in contact with the right-angle boss 16, the vehicle braking acceleration meets the critical condition:

[0071] (M2+2M c -M k1 )cosα1=2(F k2 -F1)r1;

[0072]

[0073] M k1 =ΔθK1;

[0074] F k2 =Δxk1;

[0075] F1=m1w 2 L1;

[0076] Wherein, M2 is the torque generated by the inertia of the rotating block 3, a2 is the critical acceleration of the ratchet slider 6 and the right-angle boss 16; M c In order to fix the torque generated by the magnetic force of the magnet on the rotating block 3, since the two sets of ratchet sliders 6, telescopic parts and movable ratchet 9 are centrally symmetrically distributed around the rotation center, the torques caused by weight cancel each other out, and the friction generated by the movement of the rotating block 3, ratchet sliders 6, telescopic parts and movable ratchet 9 can be ignored.

[0077] In one embodiment, when the vehicle brakes, if the blades 10 are in the closed state, the blades 10 rotate relative to the base plate 1 due to the inertial force, and the base plate fan ring through-holes 18 and the cover plate fan ring through-holes 25 are exposed. At this time, the vehicle braking acceleration meets the critical condition:

[0078] M3=M k2 ;

[0079]

[0080] M k2 =Δθ2K2;

[0081] Wherein, M3 is the moment of force generated by the blade 10 due to inertia, J2 is the moment of inertia of the blade 10, d is the wheel diameter, and a3 is the critical acceleration of the blade 10 relative to the base plate 1 under the action of inertia force; M k2 is the torque generated by the deformation of the second torsion spring 4, Δθ2 is the deformation of the second torsion spring 4, K2 is the elastic modulus of the second torsion spring 4, the friction force generated by the relative movement of the blade 10 and the base plate 1 is ignored, and the interaction force between the ratchet inner teeth 102 and the movable ratchet 9 is also ignored.

[0082] In one embodiment, the three critical accelerations satisfy a3<a1<a2.

[0083] The working principle of the present invention is as follows: when the car is stationary and traveling at a constant speed, the blade 10 is always kept in contact with the bottom plate spoke 13 and the bottom plate ring 12 by the action of the second torque spring 4, the fan ring through hole is closed, and the entire device is in a closed state.

[0084] When the car starts to brake and the car acceleration a satisfies a<a3<a1 (with the car's driving direction as the positive direction), the base plate 1 and its contact accessories (fixed magnet, tension spring 5, ratchet slider 6, first ratchet magnet 7, second ratchet magnet 8 and cover plate 2, etc.) rotate with the wheel at a reduced speed. Under the action of inertia, the rotating block 3 rotates relative to the base plate 1. The rotating block 3 presses the ratchet slider 6, causing it to move linearly along the slide groove 19 toward the cylindrical boss 15, and finally the ratchet slider 6 fits with the cylindrical boss 15, and the movable ratchet 9 extends. At the same time, under the action of inertia, the blade 10 also rotates relative to the base plate 1. The inner teeth 102 of the ratchet continuously push the movable ratchet 9 to contract, and the blade 10 rotates unidirectionally, thereby realizing the opening of the blade 10. At this time, the airflow inside and outside the spokes flows freely, and the airflow through the brake increases, thereby dissipating heat from the braking system.

[0085] When the car stops braking and the car acceleration a is greater than the closing critical acceleration a3 (with the car's driving direction as the positive direction), if the car acceleration a satisfies a3<a<a2 at this time, the inertia moment of the blade 10 is less than the return torque of the second torque spring 4, and the blade 10 has a closing tendency. Since the movable ratchet 9 is stuck with the ratchet inner tooth 102, the blade 10 cannot be closed; if the car acceleration a satisfies a2<a at this time, the sum of the inertia moment of the rotating block 3 and the torque provided by the fixed magnet is less than the return torque of the first torque spring, and the ratchet slider 6 moves linearly along the slide groove 19 toward the rotation center under the action of the tension spring 5 until it fits with the right-angle boss 16. At this time, the movable ratchet 9 contracts and no longer contacts the ratchet inner tooth 102, and the blade 10 closes unobstructed. The blade 10 completes the closing under the action of the second torque spring 4. At this time, the hub cover isolates the momentum exchange of the airflow inside and outside the spoke, and the aerodynamic resistance of the entire vehicle is reduced.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0087] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A passenger car active opening and closing hub cover device, characterized in that: The cam is provided with a plurality of through holes on the bottom of the base plate, and a plurality of through holes on the bottom plate are provided on the bottom plate, and a plurality of through holes on the bottom plate are provided on the bottom plate. The blade is rotatably connected to the cover plate, a second torsion spring is fixedly installed between the blade and the cover plate, right-angle bosses are fixedly installed between the two sides of the ratchet boss of the bottom plate and the cylindrical boss, a tension spring is fixedly installed between the side of the right-angle boss close to the ratchet slider and the ratchet slider, a fixed magnet is fixedly installed on the side of the right-angle boss close to the ratchet boss of the bottom plate, and the rotating block is made of magnetic material.

2. The active opening and closing hub cover device for a passenger vehicle according to claim 1, characterized in that: A plurality of ratchet inner teeth are provided on the inner side surface of the blade, and the ratchet inner teeth are in contact with the movable ratchet teeth.

3. The active opening and closing hub cover device for a passenger vehicle according to claim 1, characterized in that: The telescopic member includes a first ratchet magnet and a second ratchet magnet. The first ratchet magnet and the second ratchet magnet are fixedly mounted on both ends of the inner groove of the slider close to the movable ratchet, and the first ratchet magnet and the second ratchet magnet repel each other.

4. The active opening and closing hub cover device for a passenger vehicle according to claim 1, characterized in that: When the rotating block is in contact with the side of the right-angle boss where the fixed magnet is not installed, the first torsion spring is at its minimum deformation; when the rotating block is in contact with the side of the right-angle boss where the fixed magnet is installed, the first torsion spring reaches its maximum deformation.

5. The active opening and closing hub cover device for a passenger vehicle according to claim 4, characterized in that: When the blade completely covers the bottom plate fan ring through hole, the second torsion spring is at the minimum deformation; when the blade completely exposes the base plate ring through hole, the second torsion spring reaches the maximum deformation.

6. The active opening and closing hub cover device for a passenger vehicle according to claim 5, characterized in that: When the inner arc of the slider fits with the right-angle boss, the tension spring is at its minimum deformation; when the outer arc of the slider fits with the cylindrical boss, the tension spring is at its maximum deformation.

7. The active opening and closing hub cover device for a passenger vehicle according to claim 6, characterized in that: When the car brakes, if the ratchet slider is not in contact with the cylindrical boss, the rotating block rotates relative to the base plate due to the inertial force, and the rotating block pushes the ratchet slider along the slide toward the cylindrical boss. When the ratchet slider is completely in contact with the cylindrical boss, the car's braking acceleration meets the critical condition: (M1-M k1 )cosα1=2(F k2 -F1)r1; M k1 =Δθ1K1; F k2 =Δxk1; F1=m1w 2 L1; Where M1 is the torque generated by the inertia of the rotating block, J1 is the moment of inertia of the rotating block, d is the wheel diameter, a1 is the critical acceleration of the ratchet slider and the cylindrical boss; M k1 is the torque generated by the deformation of the first torsion spring, Δθ1 is the deformation of the first torsion spring, K1 is the elastic modulus of the first torsion spring; α1 is the rotation angle of the rotating block compared to the rotation position; F k2 is the pulling force of the tension spring on the ratchet slider, Δx is the deformation of the tension spring, k1 is the elastic modulus of the tension spring; F1 is the centrifugal force acting on the ratchet slider, telescopic member and movable ratchet, m1 is the total mass of the ratchet slider, telescopic member and movable ratchet, w is the angular velocity of the base plate, L1 is the distance between the center of mass and the center of rotation of the ratchet slider, telescopic member and movable ratchet.

8. The active opening and closing hub cover device for a passenger vehicle according to claim 7, characterized in that: When the car stops braking, if the ratchet slider fits with the cylindrical boss, the ratchet slider is pushed by the tension spring to rotate the rotating block away from the fixed magnet. When the rotating block is completely fitted with the right-angle boss, the car's braking acceleration meets the critical condition: (M2+2M c -M k1 )cosα1=2(F k2 -F1)r1; M k1 =ΔθK1; F k2 =Δxk1; F1=m 11 w 2 L1; Where M2 is the torque generated by the rotating block due to inertia, a2 is the critical acceleration of the ratchet slider and the right-angle boss; M c The fixed magnet generates a torque on the rotating block by magnetic force.

9. The active opening and closing hub cover device for a passenger vehicle according to claim 8, characterized in that: When the car brakes, if the blades are in the closed state, the blades rotate relative to the base plate due to the inertial force, and the base plate fan ring through-holes and the cover plate fan ring through-holes are exposed. At this time, the car's braking acceleration meets the critical condition: <h2 style=";text-align:left;direction:ltr">M3=M<h2 style=";text-align:left;direction:ltr"> k2 <h2 style=";text-align:left;direction:ltr"> ; M k2 =Δθ2K2; Where M3 is the moment of inertia of the blade, J2 is the moment of inertia of the blade, d is the wheel diameter, and a3 is the critical acceleration of the blade relative to the base plate due to the inertial force. k2 is the torque generated by the deformation of the second torsion spring, Δθ2 is the deformation amount of the second torsion spring, and K2 is the elastic modulus of the second torsion spring.

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