Jacking device and vehicle comprising jacking device
By using guides and springs in the hoist, instead of the traditional bushing, the rapid pressure relief of gas in the casing after the hoist is activated is achieved, solving the problem of high pressure after the traditional hoist is activated, and reducing the damage to pedestrians.
Patent Information
- Application Number
- CN202411908606.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-28
AI Technical Summary
There is a lot of pressure in the casing after the traditional hoist is activated, which leads to adverse damage to the hit pedestrian.
A hoist is designed, and a guide member and a spring instead of the traditional bushing. The guide member is equipped with a pressure relief opening. When the piston rod is pushed outward, the spring squeezes and breaks the annular boss of the guide member, and the pressure relief opening allows the gas in the sleeve to quickly release pressure.
The rapid pressure relief of gas in the casing after the hoist is activated is achieved, reducing the damage to the hit pedestrians.
Smart Images
Figure CN119705339A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of automobile safety, and in particular to a jacking device and a vehicle comprising the jacking device. Background Art
[0002] Usually, a lifter is provided at the front hood of the vehicle. When a pedestrian collides with the vehicle, the lifter is actuated and lifts the front hood so that the rear end of the front hood rises to a certain height, thereby providing a certain amount of crumpling space when the pedestrian's head hits the front hood, thereby achieving the purpose of protecting the pedestrian.
[0003] The traditional lifter mainly includes a sleeve, a piston rod, a bushing and a gas generator. Among them, the piston rod is arranged in the sleeve along the axial direction of the sleeve, the gas generator is fixed at the bottom of the sleeve, the top of the sleeve is provided with a through hole, and one end of the piston rod adjacent to the sleeve through hole is sleeved with a bushing. When the lifter is actuated, the piston rod will be ejected outward from the through hole under the action of the gas generator. During the ejection process, the bushing mainly plays a guiding and buffering role, but it will be squeezed and deformed under the huge impact force at the bottom of the piston rod. The deformation will enhance the sealing between the piston rod and the sleeve, resulting in a large pressure in the sleeve after the lifter is actuated (it has been measured that when the lifter is actuated for 300Ms, it can still provide a force of more than 1000N), which is not conducive to reducing the damage to the pedestrians who are hit. Summary of the invention
[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a jacking device and a vehicle comprising the jacking device, so as to achieve rapid pressure relief of gas in the casing after the jacking device is actuated.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] In a first aspect, the present invention provides a lifting device, comprising a sleeve, a piston rod, a gas generator and a sealing cap, wherein the piston rod is arranged in the sleeve along the axial direction of the sleeve, a through hole is arranged at the top end of the sleeve and the sealing cap is fixed to seal the through hole, and the gas generator is arranged inside the bottom end of the sleeve, and the gas generator is used to push the piston rod outward from the through hole;
[0007] The piston rod is sleeved with a guide member adjacent to the through hole and a spring away from the through hole, wherein the top end of the guide member is provided with a first annular boss extending radially outward, the bottom end of the guide member is provided with a second annular boss extending radially outward, and the first annular boss is provided with a pressure relief opening;
[0008] When the piston rod is pushed outward, the spring squeezes and breaks the second annular boss and then moves to abut against the first annular boss.
[0009] Furthermore, a plurality of the pressure relief openings are provided on the first annular boss, and the plurality of the pressure relief openings are evenly distributed along the circumference of the first annular boss.
[0010] Furthermore, the pressure relief opening is configured to be recessed radially inward from the outer periphery of the first annular boss.
[0011] Furthermore, the guide member also includes a sleeve portion sleeved on the piston rod, the sleeve portion is connected between the first annular boss and the second annular boss, and is integrally formed with the first annular boss and the second annular boss.
[0012] Furthermore, a thrust platform extending radially outward is provided at the bottom end of the piston rod, and the bottom end of the spring is fixedly connected to the top surface of the thrust platform.
[0013] Furthermore, the sealing cap is sleeved on the top end of the sleeve and has an interference fit with the sleeve.
[0014] Furthermore, there is a circumferential gap between the piston rod and the hole wall of the through hole, and when the piston rod is pushed outward, the piston rod can drive the sealing cap to expose the circumferential gap to the outside;
[0015] Alternatively, a plurality of exhaust holes are provided on the top of the sleeve, and when the piston rod is pushed outward, the piston rod can drive the sealing cap to expose the exhaust holes to the outside.
[0016] Furthermore, the sealing cap has a sealing portion embedded in the circumferential gap or the exhaust hole.
[0017] Further, the sealing cap is configured to be completely separated from the sleeve when the piston rod is pushed outward; or,
[0018] The sealing cap has a weakened area, and the weakened area is configured to be detached from the sealing cap when the piston rod is ejected outward.
[0019] In a second aspect, the present invention provides a vehicle, wherein the vehicle comprises the jacking device as described above.
[0020] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:
[0021] The present invention realizes the guiding function of the bushing in the traditional jacking device by adopting a guide member, and realizes the buffering function of the bushing in the traditional jacking device by adopting a spring. Without changing the remaining structures, when the piston rod is pushed outward under the action of the gas generator, the spring can squeeze and rupture the second annular boss and then move it to abut against the first annular boss. Since the first annular boss is provided with a pressure relief opening, the gas in the sleeve can be discharged through the pressure relief opening. When the piston rod retreats a part under the rebound action of the spring, it can help to quickly relieve pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the jacking device of the present invention;
[0023] Figure 2 An exploded view of the jacking device of the present invention;
[0024] Figure 3A It is a structural schematic diagram of the guide member in the present invention;
[0025] Figure 3B It is a longitudinal cross-sectional view of the guide member in the present invention;
[0026] Figure 4A for Figure 1 A partial enlarged view of the dotted frame area when the spring moves to abut against the second annular boss and is compressed;
[0027] Figure 4B for Figure 1 A partial enlarged view of the dotted frame area when the spring moves to abut against the first annular boss;
[0028] Figure 4C for Figure 1 The dotted box area in the figure is a partial enlarged view of the spring when it is reset. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0030] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the" and "the" used in the present disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0031] As mentioned above, when the traditional jack is actuated, the piston rod will be pushed out from the opening under the action of the gas generator. During the ejection process, the bushing will be squeezed and deformed under the huge impact force at the bottom of the piston rod. The deformation will enhance the sealing between the piston rod and the sleeve, resulting in a large pressure in the sleeve after the jack is actuated, which is not conducive to reducing the damage to the pedestrians who are hit.
[0032] In view of this, the inventor conducted in-depth research and found that the guiding and buffering functions of the bushing on the piston rod can be split into two parts, namely the guide part and the spring, so that the pressure can be quickly relieved after the lifter is actuated without changing the remaining structures.
[0033] Based on this, the present invention provides an improved jacking device and a vehicle comprising the jacking device.
[0034] Example 1
[0035] This embodiment provides a jacking device, which is installed by a bracket 10 (see Figure 1 ) is fixed to the vehicle to lift the hood of the vehicle to protect pedestrians.
[0036] like Figures 1 to 4C As shown, the jacking device of this embodiment mainly includes a sleeve 1, a piston rod 2, a gas generator 3 and a sealing cap 4. Among them, the piston rod 2 is arranged in the sleeve 1 along the axial direction of the sleeve 1, and the piston rod 2 is only circumferentially closed between its bottom and the inner wall of the sleeve 1, and there is a certain gap in the rest of the part to facilitate the movement of the piston rod 2. A through hole 41 is provided at the top of the sleeve 1, and a sealing cap 4 is fixed to seal the through hole 41. In the initial state, the top of the piston rod 2 is adjacent to the through hole 41 of the sleeve 1. A gas generator 3 is arranged inside the bottom end of the sleeve 1, which can generate high-pressure gas after ignition to push the piston rod 2 out of the through hole 41.
[0037] In addition, the piston rod 2 is also sleeved with a guide member 5 adjacent to the through hole 41 and a spring 6 away from the through hole 41. The guide member 5 is used to provide a guide for the movement of the piston rod 2; the spring 6 is a compression spring, which is used to provide a buffering effect for the movement of the piston rod 2, thereby being able to replace the bushing in the traditional jacking device.
[0038] like Figure 3A and 3BAs shown, the top end of the guide member 5 is provided with a first annular boss 51 extending radially outward, and the bottom end of the guide member 5 is provided with a second annular boss 52 extending radially outward. The first annular boss 51 and the second annular boss 52 are coaxially spaced and arranged, and the outer circumferential surfaces of both are circumferentially closed with the inner wall of the casing 1. Among them, the first annular boss 51 is provided with a plurality of pressure relief openings 511 for relieving pressure in the pipe after the lifter is actuated; the second annular boss 52 is configured to seal the inside of the casing 1 in the initial state, and can be broken under the pressure of the spring 6 when the piston rod 2 is pushed outward, so that the gas inside the casing 1 can be discharged through the pressure relief openings 511.
[0039] In this embodiment, the guide member 5 further includes a sleeve portion 53 sleeved on the piston rod 2, the sleeve portion 53 is connected between the first annular boss 51 and the second annular boss 52, and is integrally formed with the first annular boss 51 and the second annular boss 52. As an example but not a limitation, the plurality of pressure relief openings 511 are arranged in an arc shape and are recessed radially inward from the outer circumference of the first annular boss 51. Preferably, the guide member 5 is made of plastic, and the plurality of pressure relief openings 511 are evenly distributed along the circumference of the first annular boss 51 to achieve uniform pressure relief of the gas in the tube.
[0040] See again Figure 1 and Figure 2 As shown, the bottom end of the piston rod 2 is provided with a thrust platform 21 extending radially outward, and the thrust platform 21 is circumferentially closed with the sleeve 1. The bottom end of the spring 6 is fixedly connected to the top surface of the thrust platform 21. As an example but not a limitation, the spring 6 can be fixed to the thrust platform 21 by welding, and the thrust platform 21 can be processed separately on the piston rod 2, or can be integrally formed with the piston rod 2.
[0041] When the gas generator 3 is ignited, high-pressure gas will be quickly generated in the sleeve 1 to push the piston rod 2 outward. During the ejection process of the piston rod 2, its thrust platform 21 will drive the spring 6 to move upward. When the spring 6 moves to abut against the bottom surface of the second annular boss 52, it begins to compress. Figure 4A When the spring 6 is compressed to a certain extent, it will squeeze and rupture the second annular boss 52 and continue to move until it abuts against the first annular boss 51. Figure 4B As shown. Since the second annular boss 52 is squeezed and broken and separated from the guide member 5, the gas in the sleeve 1 can be discharged upward through the pressure relief opening 511 on the first annular boss 51. Then, the piston rod 2 can be reset and retreated partially under the rebound effect of the spring 6 to help quickly release the pressure. Figure 4C shown.
[0042] In this embodiment, the sealing cap 4 is preferably sleeved on the top end of the sleeve 1 and has an interference fit with the sleeve 1 , so as to achieve reliable sealing of the sleeve 1 .
[0043] In an operative manner, there is a circumferential gap between the piston rod 2 and the hole wall of the sleeve through hole 41. When the piston rod 2 is pushed outward, the piston rod 2 can drive the sealing cap 4 to expose the circumferential gap to the outside, so as to quickly discharge the gas in the sleeve 1 to the outside through the circumferential gap exposed to the outside. As a result, the gas in the sleeve 1 can be discharged to the outside air through the circumferential gap after flowing through the pressure relief opening 511.
[0044] In another practicable manner, a plurality of exhaust holes (not shown) are reserved at the top of the sleeve 1. Accordingly, when the piston rod 2 is pushed outward, it can drive the sealing cap 4 to expose these exhaust holes to the outside, so that the gas in the sleeve 1 can be quickly discharged to the outside through the exhaust holes exposed to the outside. Thus, after the gas in the sleeve 1 flows through the pressure relief opening 511, it can be discharged to the outside air through these exhaust holes.
[0045] As an example but not a limitation, the corresponding area of the sealing cap 4 has a sealing portion 42 embedded in the aforementioned circumferential gap or exhaust hole to improve the sealing performance inside the sleeve 1.
[0046] In an operative manner, the sealing cap 4 has a weakened area, which is configured to separate from the sealing cap 4 when the piston rod 2 is ejected outward. The weakened area should cover the area corresponding to the top position of the piston rod 2 and the area having the aforementioned sealing portion 42. When the piston rod 2 is ejected outward, the weakened area separates from the sealing cap 4, and the remaining part of the sealing cap 4 is retained on the sleeve 1, as shown in FIG. Figure 4A and 4B Preferably, the edge of the weakened area may be provided with a tear line to facilitate separation of the weakened area.
[0047] In another practicable manner, the sealing cap 4 is configured to be completely separated from the sleeve 1 when the piston rod 2 is ejected outward, that is, when the piston rod 2 is ejected outward, it can drive the sealing cap 4 to be separated from the sleeve 1 as a whole, and the sealing cap 4 is no longer left on the sleeve 1. Figure 4C shown.
[0048] As an example but not a limitation, the lifter of this embodiment may further include a plastic sleeve 7 fixed inside the bottom end of the casing 1, and the gas generator 3 is limitedly installed in the plastic sleeve 7 to prevent the gas generator 3 from being displaced.
[0049] As an example but not a limitation, a sealing ring 8 may also be provided at the bottom of the piston rod 2 to achieve sealing between the bottom of the piston rod 2 and the sleeve 1 .
[0050] In this embodiment, the guiding function of the bushing in the traditional jacking device is realized by adopting the guide member 5, and the buffering function of the bushing in the traditional jacking device is realized by adopting the spring 6. Without changing the remaining structures, when the piston rod 2 is pushed outward under the action of the gas generator 3, the spring 6 can squeeze and rupture the second annular boss 52 and then move it to abut against the first annular boss 51. Since the first annular boss 51 is provided with a pressure relief opening 511, the gas in the sleeve 1 can be quickly depressurized and discharged through the pressure relief opening 511. When the piston rod 2 retreats a part under the rebound action of the spring 6, it can help to quickly relieve the pressure.
[0051] Example 2
[0052] This embodiment provides a vehicle, which includes the jacking device provided in Embodiment 1, so that the hood of the vehicle can be effectively lifted and rapid pressure relief can be achieved, thereby achieving the purpose of protecting pedestrians.
[0053] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A lifting device, comprising a sleeve, a piston rod, a gas generator and a sealing cap, wherein the piston rod is arranged in the sleeve along the axial direction of the sleeve, the top end of the sleeve is provided with a through hole and the sealing cap is fixed to seal the through hole, the bottom end of the sleeve is provided with the gas generator, and the gas generator is used to push the piston rod out from the through hole, characterized in that: The piston rod is sleeved with a guide member adjacent to the through hole and a spring away from the through hole, wherein the top end of the guide member is provided with a first annular boss extending radially outward, the bottom end of the guide member is provided with a second annular boss extending radially outward, and the first annular boss is provided with a pressure relief opening; When the piston rod is pushed outward, the spring squeezes and breaks the second annular boss and then moves to abut against the first annular boss.
2. The jacking device according to claim 1, characterized in that: The first annular boss is provided with a plurality of pressure relief openings, and the plurality of pressure relief openings are evenly distributed along the circumference of the first annular boss.
3. The jacking device according to claim 1, characterized in that: The pressure relief opening is configured to be recessed radially inward from the outer periphery of the first annular boss.
4. The jacking device according to claim 1, characterized in that: The guide member also includes a sleeve portion sleeved on the piston rod, wherein the sleeve portion is connected between the first annular boss and the second annular boss and is integrally formed with the first annular boss and the second annular boss.
5. The jacking device according to claim 1, characterized in that: The bottom end of the piston rod is provided with a thrust platform extending radially outward, and the bottom end of the spring is fixedly connected to the top surface of the thrust platform.
6. The jacking device according to any one of claims 1 to 5, characterized in that: The sealing cap is sleeved on the top end of the sleeve and is interference fit with the sleeve.
7. The jacking device according to claim 6, characterized in that: There is a circumferential gap between the piston rod and the hole wall of the through hole, and when the piston rod is pushed outward, the piston rod can drive the sealing cap to expose the circumferential gap to the outside; Alternatively, a plurality of exhaust holes are provided on the top of the sleeve, and when the piston rod is pushed outward, the piston rod can drive the sealing cap to expose the exhaust holes to the outside.
8. The jacking device according to claim 7, characterized in that: The sealing cap has a sealing portion that is embedded in the circumferential gap or the exhaust hole.
9. The jacking device according to claim 6, characterized in that: The sealing cap is configured to be completely separated from the sleeve when the piston rod is pushed outward; or The sealing cap has a weakened area, and the weakened area is configured to be detached from the sealing cap when the piston rod is ejected outward.
10. A vehicle, characterized in that: The vehicle comprises a jack as claimed in any one of the preceding claims 1-9.