A front underbody shield device for a passenger car

Abstract

The application discloses a front car body bottom guard plate device of a household car and belongs to the technical field of automobile power system bottom protection. The guard plate device comprises a guard plate, the two side edges of the guard plate are installed on the chassis of the front car body of the automobile, further comprises a force direction conversion mechanism arranged in front of the guard plate and a crash receiver, when a crash occurs, the crash receiver receives the impact of the protrusion and transmits the impact force to the force direction conversion mechanism, the force direction conversion mechanism converts the impact force into a force F1 for lifting the front car body of the automobile upward, the front car body of the automobile is lifted upward to the height of the guard plate, the height of the protrusion is consistent, then the protrusion can slide backward on the bottom surface of the guard plate or be supported between the bottom surface of the guard plate and the road surface.

Description

TECHNICAL FIELD

[0001] The application relates to a front body bottom guard device of a household car, and belongs to the technical field of automobile power system bottom protection. BACKGROUND

[0002] The engine or motor (used in new energy vehicles) as a core component of a household car is located between the left and right front wheels of the front body, and the distance between the engine or motor and the ground is only about 150 mm, so the engine or motor is easily damaged by hard protrusions on the ground during driving. Although the driver can basically judge the road conditions in front during driving, when the line of sight is poor, the vehicle speed is high, or the driver is not concentrated, it is difficult to discover and take evasive measures in time for protrusions with a height of 20-40 mm above the distance between the bottom surface of the car and the ground, and general car bottom scratches are caused by such protrusions. However, protrusions with a height of more than 40 mm above the distance between the bottom surface of the car and the ground can be discovered in time and measures such as avoiding or reducing the impact force can be taken.

[0003] The protrusions on the road are relative to the ground on which the wheels are located. When there is a pit on the road, the wheels in driving fall into the pit, so that the bottom of the car contacts the road. At this time, the road is also the protrusion referred to in this paper.

[0004] The existing guard plate is installed on the chassis connected between the lower bottom surface of the front body and the main beam of the car, and the bottom of the engine or motor is protected. In order to avoid the deformation of the beam caused by excessive impact force during strong impact, the existing technology endows the steel guard plate with deformable elasticity, so as to avoid the deformation of the beam caused by the hard guard plate when the impact force of the protrusion on the road is too large. This results in that the protection of the existing bottom guard plate for the engine or motor is actually very limited, and the deformation of the guard plate will still damage the engine or motor under strong impact. SUMMARY

[0005] The technical problem to be solved by the application is how to protect the bottom of the engine or motor by the guard plate without damaging the beam of the car when the car is subjected to strong impact of the protrusion on the ground.

[0006] In view of the above problems, the technical solution provided by the application is as follows:

[0007] A front body bottom guard device of a household car, comprising a guard plate, the two side edges of the guard plate being installed on the chassis of the front body of the car, and further comprising a force conversion mechanism arranged in front of the guard plate and an impact receiver. When impact occurs, the impact receiver receives the impact of the protrusion and transmits the impact force to the force conversion mechanism, and the force conversion mechanism converts the impact force into a force F1 for lifting the front body of the car upward, so that the front body of the car is lifted upward to the height of the guard plate and the height of the protrusion, and then the protrusion can slide backward on the bottom surface of the guard plate or be supported between the bottom surface of the guard plate and the road.

[0008] The force conversion mechanism comprises a left fixed arm, a right fixed arm, a left pressure turning arm, a right pressure turning arm, a left elastic body and a right elastic body, the rear ends of the left fixed arm and the right fixed arm are fixedly connected with the two side edges of the guard plate respectively, the front ends of the left pressure turning arm and the right pressure turning arm are hingedly connected with the front ends of the left fixed arm and the right fixed arm respectively, the left elastic body is located between the left pressure turning arm and the left fixed arm, the right elastic body is located between the right pressure turning arm and the right fixed arm, the front ends of the left pressure turning arm and the right pressure turning arm are equal in height, the rear ends of the left pressure turning arm and the right pressure turning arm are equal in height, and the front ends of the left pressure turning arm and the right pressure turning arm are higher than the rear ends of the left pressure turning arm and the right pressure turning arm respectively in the non-impact state.

[0009] The rear sections of the left fixed arm and the right fixed arm are arched upward to form left and right compression spaces respectively.

[0010] The left elastic body and the right elastic body are made of rubber.

[0011] The impact receiver comprises a synchronous roller, a left sliding block and a right sliding block, the left sliding block and the right sliding block are installed on the left pressure turning arm and the right pressure turning arm respectively and can slide forward and backward on the left pressure turning arm and the right pressure turning arm synchronously, the synchronous roller can directly bear the impact of the protrusion and can rotate around its own axis, the two ends of the synchronous roller are installed on the left sliding block and the right sliding block respectively, the ends of the two ends of the synchronous roller are pressed on the bottom surfaces of the left pressure turning arm and the right pressure turning arm respectively to walk forward and backward in a rolling manner, when the synchronous roller rolls backward, the left elastic body and the right elastic body are compressed constantly, the left pressure turning arm and the right pressure turning arm rotate upward, and when the synchronous roller rolls backward to the position close to the guard plate, the height of the lower side surface of the synchronous roller is consistent with the height of the guard plate.

[0012] The left sliding block has a left sliding groove on the left side, the left pressure turning arm has a left sliding rail on the right side, and the left sliding rail is sleeved in the left sliding groove; the right sliding block has a right sliding groove on the right side, the right pressure turning arm has a right sliding rail on the left side, and the right sliding rail is sleeved in the right sliding groove.

[0013] The synchronous roller is made of an impact-resistant metal material, a rubber layer is vulcanized and bonded on a section of the outer periphery between the left sliding block and the right sliding block, and the ends of the two ends of the synchronous roller are provided with gears, and the bottom surfaces of the left pressure turning arm and the right pressure turning arm are provided with racks engaged with the gears.

[0014] A free roller parallel to the synchronous roller and capable of rotating around its own axis is arranged between the left sliding block and the right sliding block above the synchronous roller, the two ends of the free roller are installed on the left sliding block and the right sliding block through rotating shafts respectively, and the height difference between the free roller and the synchronous roller is less than the radius of the synchronous roller.

[0015] A decorative plate is arranged between the left slider and the right slider above the free roller, and the decorative plate is arranged on the left slider and the right slider through two rotating shafts at both ends, and a rubber part is arranged at the lower rear side of the decorative plate to make it elastically rotate backward and reset forward.

[0016] The impact receiver is an impact plate connected with the left and right pressure rotating arms and capable of bearing the impact of the protrusion, and the bottom surface of the impact plate is in the same plane with the bottom surfaces of the left and right pressure rotating arms.

[0017] Beneficial effects: when the protrusion contacts the guard plate at the bottom of the engine or motor, the bottom of the front vehicle body has been lifted to the same height as the protrusion, and the guard plate does not need to bear the force of lifting the front vehicle body by a height, but at most only maintains the force of the protrusion on the bottom to prevent the front vehicle body from falling, thereby greatly reducing the backward and upward impact force suffered by the guard plate, so that the guard plate is not deformed to contact the upper engine or motor and damage the engine or motor; the impact receiver in the guard plate device is arranged in the lower bottom empty area between the engine and the bumper, which does not occupy useful space and does not affect the appearance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic view of the guard plate device at the bottom of the front vehicle body of the household car according to the first embodiment;

[0019] Figure 2 It is a three-dimensional schematic view of the structural relationship of the left fixed arm, the right fixed arm, the left pressure rotating arm, the left sliding rail, the right pressure rotating arm and the guard plate according to the first embodiment;

[0020] Figure 3 It is a three-dimensional schematic view of the assembly relationship of the guard plate, the force conversion mechanism and the impact receiver according to the first embodiment;

[0021] Figure 4 It is a three-dimensional schematic view of the Figure 3 partial view according to the first embodiment, mainly showing the assembly relationship of the left slider with the left sliding rail through the left sliding groove;

[0022] Figure 5 It is a disassembled schematic view of each part of the impact receiver according to the first embodiment;

[0023] Figure 6 It is an assembly schematic view of the frame body composed of the left slider, the left sliding groove and the right slider and the transition plate according to the first embodiment;

[0024] Figure 7 It is an assembly schematic view of the frame body composed of the left slider, the left sliding groove and the right slider and the transition plate and the synchronous roller according to the first embodiment, and the transition plate is blocked in the figure;

[0025] Figure 8The assembly diagram of the frame body composed of the left slider, the left sliding groove, the right slider, the transition plate, the synchronous roller and the free roller of the embodiment one, wherein the transition plate is blocked in the diagram;

[0026] Figure 9 The cross-sectional diagram of the impact receiver of the embodiment one;

[0027] Figure 10 The partial cross-sectional diagram of the force direction conversion mechanism and the synchronous roller of the embodiment one, wherein the synchronous roller gear is shown to run on the rack at the bottom surface of the left pressure turning arm towards the guard plate, and F1 is the upward pressure of the gear on the left pressure turning arm, which is also the upward lifting force F1 on the front vehicle body;

[0028] Figure 11 The partial cross-sectional diagram of the force direction conversion mechanism and the synchronous roller of the embodiment one, wherein the lower surface of the synchronous roller is shown to be consistent with the height of the ground of the guard plate when the synchronous roller gear has run on the rack at the bottom surface of the left pressure turning arm towards the guard plate to the end, and the upward lifting force F1 of the gear on the front vehicle body disappears, and only the support force for maintaining the height of the lifted front vehicle body is provided;

[0029] Figure 12 The schematic diagram of the beginning of the device in which the protrusion impacts the guard plate at the bottom of the front vehicle body of the embodiment one, wherein the protrusion is shown to have impacted the guard plate of the impact receiver, and the guard plate is shown to be in a state of avoiding by turning back, and F2 is the upward support force of the spring of the front vehicle body on the front vehicle body;

[0030] Figure 13 The schematic diagram of the beginning of the device in which the protrusion impacts the guard plate at the bottom of the front vehicle body of the embodiment one, wherein the protrusion is shown to have impacted the free roller of the impact receiver, and the guard plate is shown to be in a state of avoiding by turning back, and F2 is the upward support force of the spring of the front vehicle body on the front vehicle body;

[0031] Figure 14 The schematic diagram of the device in which the protrusion impacts the guard plate at the bottom of the front vehicle body of the embodiment one, wherein the protrusion is shown to have been rolled under the free roller and to have impacted the free roller of the impact receiver, and in this process, the impact receiver slides back and the gear at both ends of the synchronous roller applies the upward lifting force F1 on the front vehicle body, and under the joint action of F1 and F2, the front vehicle body has been lifted to a set height, and the spring of the vehicle has been stretched and lengthened;

[0032] Figure 15 The schematic diagram of the device in which the protrusion impacts the guard plate at the bottom of the front vehicle body of the embodiment one, wherein the protrusion is shown to have been rolled under the synchronous roller and to have contacted the transition plate, and in this process, the impact receiver continues to slide back and continues to apply the upward lifting force F1 on the front vehicle body, and under the joint action of F1 and F2, the front vehicle body has been lifted to a set height, and the spring of the vehicle has been further stretched and lengthened;

[0033] Figure 16 This is a schematic diagram of the device for impacting the front vehicle body bottom guard plate described in Embodiment 1. The diagram shows that the protrusion has transitioned to the bottom of the guard plate, the impactor has retreated to the position before the impact started, the upward lifting force F1 applied to the front vehicle body has disappeared, and only the guard plate and the car spring maintain the support force of the height of the front vehicle body after it has been lifted. The car spring still maintains the extension length of the front vehicle body after it has been lifted.

[0034] Figure 17 This is a three-dimensional schematic diagram of the front underbody protection plate device for a family car as described in Embodiment 2.

[0035] In the diagram: 1. Guard plate; 2. Force conversion mechanism; 201. Left fixed arm; 202. Right fixed arm; 203. Left pressure rotating arm; 2031. Left slide rail; 204. Right pressure rotating arm; 2041. Right slide rail; 205. Left elastic body; 206. Right elastic body; 207. Left compression space; 208. Right compression space; 209. Rack; 3. Impact receiver; 300. Impact plate; 301. Left slider; 3011. Left slide groove; 302. Right slider; 3021. Right slide groove; 303. Connector; 304. Synchronous roller; 3041. Gear; 305. Free roller; 3051. Shaft one; 306. Trim panel; 3061. Shaft two; 307. Transition plate; 308. Reset tension spring; 309. Rubber part; 310. Rubber layer; 311. Tension spring hole; 4. Front body; 401. Automobile spring; 402. Wheel; 5. Protrusion; 6. Road surface. Detailed Implementation

[0036] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0037] Example 1: As Figure 1 , 3 As shown, a front underbody protection plate device for a passenger car includes a protection plate 1. The two sides of the protection plate 1 are mounted on the underframe of the front body 4 of the car. It also includes a force conversion mechanism 2 and a shock absorber 3 located in front of the protection plate 1. When an impact occurs, the shock absorber 3 receives the impact of the protrusion 5 and transmits the impact force to the force conversion mechanism 2. The force conversion mechanism 2 converts the impact force into a force F1 that lifts the front body 4 of the car upward, so that the height of the protection plate 1 is the same as the height of the protrusion 5. Then, the protrusion 5 can slide backward over the bottom surface of the protection plate 1 or be supported between the bottom surface of the protection plate 1 and the road surface 6. In this way, when the protrusion 5 contacts the guard plate 1, the bottom of the front vehicle body 4 has already been raised to the same height as the protrusion 5. The guard plate 1 does not need to bear the additional force that lifts the front vehicle body 4 to a certain height. At most, it only maintains the force that keeps the protrusion 5 at its bottom to prevent the front vehicle body 4 from falling down. This greatly reduces the rearward and upward impact force suffered by the guard plate 1, so that the guard plate 1 will not deform to the point of contacting the upper engine or motor and damaging the engine or motor.

[0038] As shown in Figure 2 , 3 , the force conversion mechanism 2 comprises a left fixed arm 201, a right fixed arm 202, a left pressure turning arm 203, a right pressure turning arm 204, a left elastic body 205, and a right elastic body 206. The rear ends of the left fixed arm 201 and the right fixed arm 202 are fixedly connected with the two side edges of the guard plate 1, so that the left fixed arm 201 and the right fixed arm 202 become an integral part of the guard plate 1. The front ends of the left pressure turning arm 203 and the right pressure turning arm 204 are hingedly connected with the front ends of the left fixed arm 201 and the right fixed arm 202, respectively. The left elastic body 205 is located between the left pressure turning arm 203 and the left fixed arm 201, and the right elastic body 206 is located between the right pressure turning arm 204 and the right fixed arm 202. The front ends of the left pressure turning arm 203 and the right pressure turning arm 204 are of equal height, and the rear ends of the left pressure turning arm 203 and the right pressure turning arm 204 are of equal height. In a non-impact state, the front ends of the left pressure turning arm 203 and the right pressure turning arm 204 are higher than the rear ends of the left pressure turning arm 203 and the right pressure turning arm 204, respectively, so that the bottom surfaces of the left pressure turning arm 203 and the right pressure turning arm 204 are inclined surfaces with the front end being higher than the rear end.

[0039] The rear sections of the left fixed arm 201 and the right fixed arm 202 are arched upward to form left and right compression spaces 207 and 208, respectively, which are open downward. The left elastic body 205 and the right elastic body 206 are located in the left and right compression spaces 207 and 208, respectively.

[0040] Preferably, the left elastic body 205 and the right elastic body 206 are made of rubber. The left elastic body 205 made of rubber is bonded to the upper surface of the left pressure turning arm 203 and the lower surface of the left fixed arm 201 by vulcanization. The right elastic body 206 made of rubber is bonded to the upper surface of the right pressure turning arm 204 and the lower surface of the right fixed arm 202 by vulcanization. Of course, the left elastic body 205 and the right elastic body 206 can also be metal springs, but the rubber material has good damping characteristics.

[0041] As shown in Figures 3-9As shown, as preferred, the impact receiver 3 comprises a synchronous roller 304, a left sliding block 301 and a right sliding block 302, the left sliding block 301 and the right sliding block 302 are respectively installed on the left pressure turning arm 203 and the right pressure turning arm 204 and can slide forward and backward on the left pressure turning arm 203 and the right pressure turning arm 204 respectively, the synchronous roller 304 can directly bear the impact of the protrusion 5 and can rotate around its own axis, the two ends of the synchronous roller 304 are respectively installed on the left sliding block 301 and the right sliding block 302, the end portions of the two ends of the synchronous roller 304 are respectively pressed on the bottom surface of the left pressure turning arm 203 and the bottom surface of the right pressure turning arm 204 to walk forward and backward in a rolling manner, when the synchronous roller 304 rolls backward, the left elastic body 205 and the right elastic body 206 are constantly compressed, the left pressure turning arm 203 and the right pressure turning arm 204 are turned upward, when the synchronous roller 304 rolls backward to be close to the guard plate 1, the height of the lower side surface of the synchronous roller 304 is consistent with the height of the guard plate 1. In order to facilitate the description of the principle below, the height between the road surface 6 and the guard plate 1 is defined as H, the height of the guard plate 1 is close to the height of the bottom surface of the automobile, and it can also be understood that H is the height of the bottom surface of the automobile relative to the road surface 6.

[0042] The basic principle of the above arrangement is that the impact absorber 3 is located in front of the force conversion mechanism 2 before the vehicle encounters the road protrusion 5, so that the height between the lower surface of the synchronous roller 304 and the road surface 6 is H. When the protrusion 5 with a height higher than H hits the synchronous roller 304, and the height of the protrusion 5 above H is less than the radius of the synchronous roller 304, the protrusion 5 hits the synchronous roller 304 below the center line of the shaft, and the protrusion 5 contacts the lower part of the synchronous roller 304 to form a strong friction force that rotates the synchronous roller 304 backward. The backward rotation of the synchronous roller 304 makes the two ends of the synchronous roller 304 roll backward on the lower surfaces of the left and right pressure arms 203 and 204, respectively. Since the bottom surfaces of the left and right pressure arms 203 and 204 are inclined surfaces that are high in front and low in back, the bottom surfaces of the left and right pressure arms 203 and 204 are constantly subjected to the force F1 upwardly pushed by the two ends of the synchronous roller 304. This force F1 has two effects: one is that the left and right elastic bodies 205 and 206 are constantly compressed, and the left and right pressure arms 203 and 204 are constantly rotated upward, so that the rear ends of the left and right pressure arms 203 and 204 constantly approach the height of the front end of the guard plate 1; the other is that this force F1 causes the front vehicle body 4 to be subjected to an additional upward lifting force, which, together with the support force F2 provided by the vehicle spring 401, lifts the front vehicle body 4. Due to the lifting of the front vehicle body 4 and the upward rotation of the left and right pressure arms 203 and 204, as the impact absorber 3 approaches the guard plate 1, the top surface of the protrusion 5 is rolled onto the lower surface of the synchronous roller 304, which is substantially the same height as the guard plate 1. As the vehicle continues to move forward, the protrusion 5 slides onto the guard plate 1, and no longer exerts an upward impact force on the guard plate 1 to cause excessive deformation of the guard plate and damage to the engine above. In this way, the synchronous roller 304 rolls from the front end to the rear end of the left and right pressure arms 203 and 204, which actually gives the front vehicle body 4 time to flexibly lift upward. Although the time is only an instant, it is much smaller than the impact force that the guard plate 1 of the prior art directly hits the protrusion, and can ensure that the guard plate will not be deformed excessively.

[0043] It should be noted that the height of the protrusion 5 is generally only adapted to be within 60 mm above the above-mentioned H value, and protrusions with a height of more than 40 mm above the H value (close to the distance between the bottom surface of the vehicle and the ground) are generally discovered in time and measures are taken to avoid or reduce the impact force.

[0044] It should be noted that the body of the passenger car is supported on the corresponding wheels 402 by four automobile springs 401, and the weight of the passenger car body is mainly concentrated on the front body 4 with the engine and gearbox. When the above-mentioned guard device is lifted within the lifting range of the front body 4 upon impact, the lifting force is mainly provided by the elastic force F2 of the compressed automobile spring 401, and the force F1 is only auxiliary, but under the joint action of F2 and F1, the front body 4 is lifted within a very small lifting range.

[0045] To ensure that the height of the lower side of the synchronous roller 304 is consistent with the height of the guard 1 when the synchronous roller 304 rolls backward to approach the guard 1, the rigidity of the left elastic body 205 and the right elastic body 206 can be adjusted, or a limiting structure can be provided.

[0046] As shown in Figures 3-5 Preferably, the left sliding block 301 has a left sliding groove 3011 on the left side, the left pressure turning arm 203 has a left sliding rail 2031 on the right side, and the mounting mode of the left sliding block 301 on the left pressure turning arm 203 is that the left sliding rail 2031 is sleeved in the left sliding groove 3011; the right sliding block 302 has a right sliding groove 3021 on the right side, the right pressure turning arm 204 has a right sliding rail 2041 on the left side, and the mounting mode of the right sliding block 302 on the right pressure turning arm 204 is that the right sliding rail 2041 is sleeved in the right sliding groove 3021. The impact receiver 3 further comprises a connecting piece 303 arranged between the left sliding block 301 and the right sliding block 302, so that the left sliding block 301, the right sliding block 302 and the connecting piece 303 form a frame body that restricts the synchronous roller 304 on the left pressure turning arm 203 and the right pressure turning arm 204 and enables the synchronous roller 304 to move forward and backward.

[0047] As shown in Figure 3 , 5 , 8, 9, 10, 11, the end portions of the synchronous roller 304 are provided with gears 3041, and the bottom surfaces of the left pressure turning arm 203 and the right pressure turning arm 204 are provided with racks 209 engaged with the gears 3041. Thus, when the protrusions 5 contact the synchronous roller 304 to form a friction force that causes the synchronous roller 304 to rotate backward, the synchronous roller 304 is forced to synchronously rotate at the lower surfaces of the left pressure turning arm 203 and the right pressure turning arm 204.

[0048] The synchronous roller 304 is made of an impact-resistant metal material, and a section of the outer periphery between the left sliding block 301 and the right sliding block 302 has a vulcanized rubber layer 310. The rubber layer 310 functions to buffer the contact between the synchronous roller 304 and the protrusions 5, and also enhances the friction with the surface of the protrusions 5, forcing the synchronous roller 304 to rotate backward.

[0049] Further, a free roller 305 parallel to the synchronous roller 304 is arranged between the left slider 301 and the right slider 302 above the front of the synchronous roller 304, the two ends of the free roller 305 are respectively installed on the left slider 301 and the right slider 302 through the rotating shaft 3051, and the height difference between the free roller 305 and the synchronous roller 304 is less than the radius of the synchronous roller 304. The setting of the free roller 305 can meet higher protrusions 5, and the protrusions 5 higher than the lower half of the synchronous roller 304 can be transferred to the synchronous roller 304 in sequence. Of course, the outer periphery of the free roller 305 is also wrapped with a rubber layer 310.

[0050] A decorative plate 306 is arranged between the left slider 301 and the right slider 302 above the front of the free roller 305, the decorative plate 306 is respectively installed on the left slider 301 and the right slider 302 through the rotating shaft 3061 at both ends, and the lower middle part of the back of the decorative plate 306 is provided with a rubber piece 309 for elastic rotation backward and forward reset. The function of the decorative plate 306 is to block the force conversion mechanism 2 and the impact receiver 3 behind the line of sight, and to play a decorative role, and the front outer surface has a paint surface suitable for the vehicle body. When encountering a protrusion impact, the decorative plate 306 can rotate backward around the rotating shaft 3061, so that the protrusion 5 is met by the free roller 305, and the decorative plate 306 can be rotated to the original posture under the elastic action of the rubber piece 309.

[0051] Optionally, a transition plate 307 is further arranged behind the synchronous roller 304, and when the impact receiver 3 retreats backward after impact, the transition plate 307 behind the synchronous roller 304 is in abutment with the guard plate 1.

[0052] As shown in Figure 1 , 5 , the impact receiver 3 further includes a reset tension spring 308, the front end of the left slider 301 and the right slider 302 is respectively provided with a tension spring hole 311, the rear end of the reset tension spring 308 is fixed in the tension spring hole 311, and the front end is connected with the vehicle body below the front bumper of the vehicle, for resetting the impact receiver 3 which slides to the rear guard plate 1 after impact.

[0053] The working process of the device when the highest protrusion 5 impact is borne will be briefly described below with reference to the accompanying Figures 12-16 As shown in

[0054] As shown in Figure 12 , the protrusion 5 first collides with the decorative plate 306 in front of the free roller 305; Figure 13 As shown in Figure 14As shown, the protrusion 5 is rolled up under the free roller 305 and comes into contact with the synchronous roller 304. From the time the protrusion 5 hits the free roller 305 to the time it is rolled up under the free roller 305, the impactor 3 has slid towards the guard plate 1. The force F1 formed, together with the supporting force F2 of the car spring 401, causes the front body 4 to be lifted, and at the same time the car spring 401 has a corresponding extension. Figure 15 As shown, the protrusion 5 is rolled up below the synchronous roller 304 and contacts the bottom surface of the transition plate 307. From the moment the protrusion 5 hits the synchronous roller 304 until it is rolled up below the synchronous roller 304, the impactor 3 continues to slide towards the guard plate 1 until it is close to the guard plate 1. The force F1 formed, together with the supporting force F2 of the car spring 401, causes the front body 4 to be further lifted. The height of the protrusion 5 is basically the same as the height of the guard plate 1. At this time, the car spring 401 has further extended. Figure 16 As shown, the protrusion 5 has been moved onto the guard plate 1, causing the force F1 that lifts the front vehicle body 4 to disappear. However, due to the support of the protrusion 5, the guard plate 1 supports the front vehicle body 4, preventing it from sinking. The impactor 3 returns to its position before the impact under the action of the reset spring 308.

[0055] In this embodiment, the impactor in the guard plate device is located in the lower bottom empty area between the engine and the bumper. It neither occupies useful space nor affects the appearance. Due to the obstruction of the trim panel 24, people can hardly see the existence of the guard plate device unless they squat down.

[0056] Example 2: Figure 17 As shown, the difference between this embodiment and Embodiment 1 is that the impactor 3 is a shock plate 300 connecting the left pressure arm 203 and the right pressure arm 204, capable of withstanding the impact of the protrusion 5. The bottom surface of the shock plate 300 is on the same plane as the bottom surfaces of the left pressure arm 203 and the right pressure arm 204. That is, in the non-impact state, the front end of the shock plate 300 is higher than the front end of the guard plate 1, and the rear end is lower than the front end of the guard plate 1, making the bottom surface of the shock plate 300 a slope that is higher in the front and lower in the rear. When encountering the protrusion 5, the protrusion 5 impacts the bottom surface of the shock plate 300 and slides backward on the bottom surface of the shock plate 300, continuously squeezing the left pressure arm 203 and the right pressure arm 204 upward, causing the left elastic body 205 and the right elastic body 206 to be continuously compressed and providing a force F1 that lifts the front vehicle body 4, thus lifting the front vehicle body 4. When the rear bottom surface of the impact plate 300 is at the same height as the guard plate 1, the protrusion 5 transitions horizontally onto the guard plate 1. Compared with Embodiment 1, this embodiment has a simpler structure, but the protrusion 5 slides and rubs on the bottom surface of the impact plate 300, resulting in high frictional resistance and a large backward thrust on the guard plate device. Therefore, it is necessary to reduce the slope angle of the bottom surface of the impact plate 300 to reduce frictional resistance and decrease the backward thrust on the guard plate device, making it suitable for dealing with lower protrusions.

[0057] The above examples are only used for more clearly describing the present application, and cannot be considered as limiting the protection scope of the present application, and any equivalent modification should be considered as falling into the protection scope of the present application.

Claims

1. A device for protecting the bottom of the front body of a passenger car, comprising a shield (1) which is mounted on the chassis of the front body (4) of the car on both sides, characterized in that: It also includes a force conversion mechanism (2) and a bumper (3) in front of the guard plate (1). When the impact occurs, the impact of the protrusion (5) is accepted by the bumper (3) and the impact force is transmitted to the force conversion mechanism (2), and the impact force is converted by the force conversion mechanism (2) into a force F1 that lifts the front body (4) of the car upward, so that the front body (4) of the car is lifted upward to the height of the guard plate (1) and the height of the protrusion (5), and then the protrusion (5) can slide backward on the bottom surface of the guard plate (1) or be supported between the bottom surface of the guard plate (1) and the road surface (6); the force conversion mechanism (2) includes a left fixed arm (201), a right fixed arm (202), a left pressure turning arm (203), a right pressure turning arm (204), a left elastic body (205), and a right elastic body (206), the rear ends of the left fixed arm (201) and the right fixed arm (202) are fixedly connected with the two side edges of the guard plate (1), the front ends of the left pressure turning arm (203) and the right pressure turning arm (204) are hingedly connected with the front ends of the left fixed arm (201) and the right fixed arm (202), the left elastic body (205) is located between the left pressure turning arm (203) and the left fixed arm (201), the right elastic body (206) is located between the right pressure turning arm (204) and the right fixed arm (202), the front ends of the left pressure turning arm (203) and the right pressure turning arm (204) are equal in height, the rear ends of the left pressure turning arm (203) and the right pressure turning arm (204) are equal in height, and in a non-impact state, the front ends of the left pressure turning arm (203) and the right pressure turning arm (204) are higher than the rear ends of the left pressure turning arm (203) and the right pressure turning arm (204) in height; the bumper (3) includes a synchronous roller (304), a left sliding block (301), and a right sliding block (302), the left sliding block (301) and the right sliding block (302) are installed on the left pressure turning arm (203) and the right pressure turning arm (204) and can synchronously slide forward and backward on the left pressure turning arm (203) and the right pressure turning arm (204), the synchronous roller (304) can directly bear the impact of the protrusion (5) and can rotate around its own axis, and its two ends are installed on the left sliding block (301) and the right sliding block (302), respectively, and the ends of the two ends of the synchronous roller (304) are respectively pressed on the bottom surfaces of the left pressure turning arm (203) and the right pressure turning arm (204) to roll forward and backward, when the synchronous roller (304) rolls backward, the left elastic body (205) and the right elastic body (206) are continuously compressed, and the left pressure turning arm (203) and the right pressure turning arm (204) are turned upward, when the synchronous roller (304) rolls backward to the height of the guard plate (1), the height of the lower side surface of the synchronous roller (304) is consistent with the height of the guard plate (1); the ends of the two ends of the synchronous roller (304) are provided with gears (3041), and the bottom surfaces of the left pressure turning arm (203) and the right pressure turning arm (204) are provided with racks (209) engaged with the gears (3041).

2. A front underbody panel arrangement for a passenger car as claimed in claim 1, characterized in that: The rear section of the left fixed arm (201) and the right fixed arm (202) is arched upward, forming a left compression space (207) and a right compression space (208) respectively, and the left elastic body (205) and the right elastic body (206) are located in the left compression space (207) and the right compression space (208) respectively.

3. A front undertray arrangement for a passenger car as claimed in claim 1 or 2, c h a r a c t e r i s e d in that: The left elastic body (205) and the right elastic body (206) are both made of rubber material.

4. The underbody rocker panel apparatus for a passenger vehicle of claim 1, wherein: The left side of the left sliding block (301) is provided with a left sliding groove (3011), the right side of the left pressure turning arm (203) is provided with a left sliding rail (2031), and the mounting mode of the left sliding block (301) on the left pressure turning arm (203) is that the left sliding rail (2031) is sleeved in the left sliding groove (3011); the right side of the right sliding block (302) is provided with a right sliding groove (3021), the left side of the right pressure turning arm (204) is provided with a right sliding rail (2041), and the mounting mode of the right sliding block (302) on the right pressure turning arm (204) is that the right sliding rail (2041) is sleeved in the right sliding groove (3021).

5. The underbody rocker panel apparatus for a passenger vehicle of claim 1, wherein: The synchronous roller (304) is made of impact-resistant metal material, and a vulcanized rubber layer (310) is provided on the outer periphery of the synchronous roller (304) between the left sliding block (301) and the right sliding block (302).

6. The underbody rocker panel apparatus for a passenger vehicle of claim 1, wherein: A free roller (305) parallel to the synchronous roller (304) is arranged between the left sliding block (301) and the right sliding block (302) in front of the synchronous roller (304), the two ends of the free roller (305) are respectively installed on the left sliding block (301) and the right sliding block (302) through a rotating shaft (3051), and the height difference between the free roller (305) and the synchronous roller (304) is less than the radius of the synchronous roller (304).

7. The underbody rocker panel apparatus for a passenger vehicle of claim 1, wherein: A decorative plate (306) is arranged between the left sliding block (301) and the right sliding block (302) in front of the free roller (305), the two ends of the decorative plate (306) are respectively installed on the left sliding block (301) and the right sliding block (302) through rotating shafts (3061), and a rubber part (309) is arranged at the rear side of the middle and lower part of the decorative plate (306) to make it elastically rotate backward and reset forward.

8. The underbody rocker panel apparatus for a passenger vehicle of claim 1 further comprising: The impact receiver (3) is an impact plate (300) connected with the left pressure turning arm (203) and the right pressure turning arm (204) and capable of bearing the impact of the protruding object (5), and the bottom surface of the impact plate (300) is in the same plane with the bottom surfaces of the left pressure turning arm (203) and the right pressure turning arm (204).

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