WO2025102775A1 - Système et procédé de test d'étanchéité à l'air pour châssis de véhicule - Google Patents

Système et procédé de test d'étanchéité à l'air pour châssis de véhicule Download PDF

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Publication number
WO2025102775A1
WO2025102775A1 PCT/CN2024/104249 CN2024104249W WO2025102775A1 WO 2025102775 A1 WO2025102775 A1 WO 2025102775A1 CN 2024104249 W CN2024104249 W CN 2024104249W WO 2025102775 A1 WO2025102775 A1 WO 2025102775A1
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WO
WIPO (PCT)
Prior art keywords
vehicle chassis
airtight
cavity
tooling
detection system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/104249
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English (en)
Chinese (zh)
Inventor
蒋先顺
邵曙光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Intelligence Technology Shanghai Ltd
Original Assignee
Contemporary Amperex Intelligence Technology Shanghai Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Intelligence Technology Shanghai Ltd filed Critical Contemporary Amperex Intelligence Technology Shanghai Ltd
Publication of WO2025102775A1 publication Critical patent/WO2025102775A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors

Definitions

  • the present application relates to the field of vehicle production technology, and in particular to an air tightness detection system and an air tightness detection method for a vehicle chassis.
  • Air tightness refers to the property of a device or component that the medium in its closed cavity will not leak under a specific pressure and time. Air tightness testing of vehicles can reveal defects or wear of vehicle systems or components, as well as whether they meet design specifications and quality standards. If the vehicle's air tightness is poor, it may lead to reduced work efficiency and even cause safety accidents.
  • the present application provides an air tightness detection system and an air tightness detection method for a vehicle chassis to achieve independent detection of the air tightness of the vehicle chassis.
  • an airtightness detection system for a vehicle chassis, the airtightness detection system comprising: an airtight tooling, provided with a sealing surface, the airtight tooling being configured to be arranged on the vehicle chassis, and a cavity being formed between the sealing surface and the vehicle chassis; a detection mechanism, connected to the cavity, the detection mechanism conveys detection gas to the cavity, and monitors the air pressure in the cavity.
  • the airtightness detection system is installed on the vehicle chassis by replacing the upper body of the vehicle with an airtight tooling to form a cavity between the sealing surface of the airtight tooling and the vehicle chassis. Since the vehicle chassis serves as the cavity wall of the cavity, the detection gas is delivered into the cavity through the detection mechanism, and the air pressure in the cavity is detected to determine the leakage of the vehicle chassis, thereby determining the airtightness of the vehicle chassis. Therefore, the airtightness detection system can realize independent testing of the airtightness of the vehicle chassis, and then enable the vehicle chassis to be delivered as an independent product that meets the airtightness standards, thereby improving the reliability of the vehicle.
  • the airtight tooling includes: a main body, provided with a sealing surface; and a connecting portion, arranged around the outer circumference of the main body, the connecting portion being configured to be sealed and connected to a vehicle chassis.
  • the connecting part is arranged around the outer periphery of the main body, and the connecting part is sealed and connected to the vehicle chassis to improve the air tightness of the connection between the airtight tooling and the vehicle chassis, thereby improving the accuracy of the vehicle chassis air tightness detection.
  • connection portion is provided with a mounting through hole
  • the air tightness detection system further comprises a mounting column, wherein a portion of the mounting column is disposed in the mounting through hole, and a portion of the mounting column is disposed in a mounting blind hole of the vehicle chassis.
  • the vehicle chassis and the outer peripheral area of the upper vehicle body are connected through a preset mounting hole and a first mounting column, a mounting through hole is arranged on the connecting portion, and the mounting column cooperates with the mounting through hole and the mounting blind hole on the vehicle chassis to realize the connection between the airtight tooling and the vehicle chassis, so that the connection method between the two can be consistent with the connection method and connection structure of the upper vehicle body and the vehicle chassis, so as to simulate the airtight state of the vehicle chassis and the upper vehicle body when they are connected, and match the working state of the vehicle chassis in actual use. conditions, making the air tightness test more in line with actual usage conditions.
  • the airtightness detection system further includes: a first sealing member, disposed between the mounting column and an end of the mounting through hole facing away from the sealing surface.
  • the airtightness effect at the mounting through hole is increased by the first sealing member, thereby improving the accuracy of vehicle chassis airtightness detection.
  • the airtight tooling is also provided with an air inlet connected to the cavity;
  • the detection mechanism includes: an air duct, one end of which is connected to the air inlet; an airtight detection component, which is connected to the other end of the air duct, and the airtight detection component transports detection gas to the cavity through the air duct and monitors the air pressure in the cavity.
  • the detection mechanism is realized by an air duct and an airtight detection component, and the detection gas is transported through the air duct. Since the position and orientation of the air duct can be adjusted flexibly, the flexibility of movement of the detection mechanism can be improved, and the convenience of airtight detection can be improved.
  • the airtight detection assembly includes: a gas adapter connected to the other end of the air duct and used to generate detection gas; a pressure measuring tube, whose detection end is arranged in the cavity and used to detect the air pressure in the cavity.
  • the air tightness detection assembly is realized by using an air adapter and a pressure measuring tube, and has a simple structure, is easy to operate and has low cost.
  • the airtightness detection system also includes: a clamp mechanism, having a first end face and a second end face arranged opposite to each other, wherein the first end face is configured to abut against a side of the airtight tooling facing away from the cavity, and the second end face is configured to abut against a side of the vehicle chassis facing away from the cavity.
  • the airtight tooling and the vehicle chassis are clamped together by a clamp mechanism to increase the airtightness of the connection between the airtight tooling and the vehicle chassis, thereby improving the accuracy of the vehicle chassis airtightness detection.
  • the airtightness detection system further includes: a gasket, which is arranged between the first end surface and the airtight tooling and/or between the second end surface and the vehicle chassis.
  • Providing a gasket between the fixture mechanism and the airtight tooling and/or providing a gasket between the fixture mechanism and the vehicle chassis can improve the overpressure problem between the airtight tooling and the vehicle chassis and improve the reliability of the airtight tooling and the vehicle chassis.
  • the shims include iron shims.
  • iron gaskets are strong and have low cost, using iron gaskets to improve the overpressure problem between the airtight tooling and the vehicle chassis can significantly improve the overpressure problem and save costs.
  • the airtight tooling further includes: a first positioning portion, which is disposed on the outer periphery of the airtight tooling and is configured to cooperate with a second positioning portion on the vehicle chassis for positioning.
  • the first positioning part is arranged on the airtight tooling to realize the positioning between the airtight tooling and the vehicle chassis, which can improve the efficiency of the vehicle chassis airtightness detection. And the first positioning part is arranged on the periphery of the airtight tooling to reduce the positioning influence of other parts of the airtight tooling on the first positioning part.
  • the airtightness testing system further includes: a transport mechanism connected to the airtightness tooling and configured to transport the airtightness tooling to the vehicle chassis or to move the airtightness tooling from the vehicle chassis after the test is completed.
  • the efficiency of vehicle chassis air tightness testing can be improved by moving the airtight tooling through a transport mechanism.
  • the transport mechanism includes: a sling; a hook portion is provided on a side of the airtight tooling away from the cavity, and the sling is detachably connected to the hook portion.
  • the handling mechanism is realized by the lifting device, so that the airtight tooling can be quickly separated from the vehicle chassis or installed on the vehicle chassis in the vertical direction, which can reduce the wear between the airtight tooling and the vehicle chassis and improve the detection efficiency.
  • the transport mechanism further includes: a translation mechanism configured to load the airtight tool to the periphery of the vehicle chassis; and a sling configured to enable movement of the airtight tool between the translation mechanism and the vehicle chassis.
  • the translation mechanism is used to load the airtight parts to the periphery of the vehicle chassis to provide The efficiency of high-airtight tooling transportation can improve the efficiency of vehicle chassis airtightness testing.
  • the air tightness detection system further includes: a second sealing member for sealing the leaking hole on the vehicle chassis.
  • the second sealing member By using the second sealing member to seal the leaking holes on the vehicle chassis, it is possible to reduce the problem of air leakage from these leaking holes and thus reduce the accuracy of the vehicle chassis air tightness detection.
  • the present application proposes an airtightness detection method for a vehicle chassis, which is used in the above-mentioned airtightness detection system.
  • the airtightness detection method includes: preparing an airtight tooling; installing the airtight tooling on the vehicle chassis of a vehicle; connecting the detection mechanism with the cavity between the airtight tooling and the vehicle chassis; controlling the detection mechanism to deliver detection gas into the cavity and monitoring the air pressure in the cavity.
  • the air tightness detection system provided in this embodiment can realize independent testing of the air tightness of the vehicle chassis, and then enable the vehicle chassis to be delivered as an independent product that meets the air tightness standards, thereby improving the reliability of the vehicle.
  • the airtightness detection system includes: an airtight tooling, provided with a sealing surface, the airtight tooling is configured to be arranged on the vehicle chassis, and a cavity is formed between the sealing surface and the vehicle chassis; a detection mechanism is connected to the cavity, the detection mechanism conveys detection gas to the cavity, and monitors the air pressure in the cavity.
  • the airtightness detection system of the present application is arranged on the vehicle chassis by replacing the upper body of the vehicle with an airtight tooling, so as to form a cavity between the sealing surface of the airtight tooling and the vehicle chassis.
  • the detection gas is conveyed into the cavity by the detection mechanism, and the air pressure in the cavity is detected to determine the leakage of the vehicle chassis, thereby determining the airtightness of the vehicle chassis. Therefore, the airtightness detection system provided by the embodiment of the present application can realize independent testing of the airtightness of the vehicle chassis, and then enable the vehicle chassis to be delivered as an independent product that meets the airtightness standard, thereby improving the reliability of the vehicle.
  • FIG1 is a schematic structural diagram of an embodiment of an air tightness detection system for a vehicle chassis of the present application
  • FIG2 is a schematic top view of a portion of the structure in the embodiment of FIG1 ;
  • FIG3 is a schematic side view of the embodiment of FIG2 ;
  • FIG4 is another side view of the embodiment of FIG3 ;
  • FIG5 is a schematic top view of a partial structure of another embodiment of the airtightness detection system of the present application.
  • FIG6 is a schematic side view of the embodiment of FIG5 ;
  • FIG7 is another side view of the embodiment of FIG5 ;
  • FIG8 is a flow chart of an embodiment of a method for detecting air tightness of a vehicle chassis of the present application.
  • FIG. 01 vehicle chassis 01, cavity 02, airtight tooling 10, sealing surface 11, connecting portion 12, mounting column 121, first sealing member 122, air inlet 13, clamp mechanism 14, first clamp 141, second clamp 142, gasket 15, first positioning portion 16, main body 17, detection mechanism 20, air duct 21, airtight detection assembly 22, transport mechanism 30, sling 31, translation mechanism 32.
  • the term "and/or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • a vehicle usually consists of four major parts: the engine, the upper body, the vehicle chassis and the electrical equipment.
  • the engine is the power unit of the vehicle;
  • the function of the vehicle chassis is to support and install the engine and other components to form the vehicle shape of the car, and to receive the power of the engine to make the car move and ensure normal driving;
  • the vehicle chassis consists of four parts: the transmission system, the running system, the steering system and the braking system;
  • the electrical equipment consists of two major parts: the power supply and the electrical equipment;
  • the vehicle body is installed on the vehicle chassis for the driver and passengers to ride or load cargo.
  • Air tightness refers to the property of a device or component that the medium in its closed cavity will not leak under a specific pressure and time. Air tightness testing of vehicles can reveal defects or wear of vehicle systems or components, as well as whether they meet design specifications and quality requirements. If the vehicle's air tightness is poor, it may lead to reduced work efficiency and even cause safety accidents.
  • the airtightness detection system and airtightness detection method proposed in the present application can detect the airtightness of the vehicle chassis alone, so that the airtightness of the vehicle chassis meets the standards.
  • the airtightness detection system of the present application is arranged on the vehicle chassis by replacing the upper body of the vehicle with an airtight tooling, so as to form a cavity between the sealing surface of the airtight tooling and the vehicle chassis. Since the vehicle chassis serves as the cavity wall of the cavity, the detection gas is delivered into the cavity by the detection mechanism, and the air pressure in the cavity is detected to determine the leakage of the vehicle chassis, thereby determining the airtightness of the vehicle chassis. Therefore, the airtightness detection system provided in the embodiment of the present application can realize independent testing of the airtightness of the vehicle chassis, and then enable the vehicle chassis to be delivered as an independent product that meets the airtightness requirements.
  • the airtightness detection system and airtightness detection method provided in the present application can be used for airtightness testing of vehicle chassis of electric vehicles/electric vehicles, pure electric vehicles, hybrid vehicles, extended-range electric vehicles, plug-in hybrid vehicles, new energy vehicles, electric buses, etc.
  • the vehicle chassis can be a skateboard chassis or the like.
  • FIG1 is a schematic structural diagram of one embodiment of the air tightness detection system for the vehicle chassis of the present application.
  • the air tightness detection system for the vehicle chassis of the present embodiment comprises: an airtight tool 10 and a detection mechanism 20, wherein the airtight tool 10 is provided with a sealing surface 11, the airtight tool 10 is configured to be arranged on the vehicle chassis 01, and a cavity 02 is formed between the sealing surface 11 of the airtight tool 10 and the vehicle chassis 01; the detection mechanism 20 is connected to the cavity 02, the detection mechanism 20 delivers detection gas to the cavity 02, and monitors the air pressure in the cavity 02.
  • the sealing surface 11 refers to the surface of the cavity wall of the airtight tooling 10 used to seal the cavity 02 except the cavity wall where the vehicle chassis 01 is located, so as to measure the airtightness of the vehicle chassis 01 through the air pressure in the cavity 02 .
  • the sealing surface 11 of the airtight tooling 10 can imitate the connection surface between the upper body and the vehicle chassis 01, so that after the vehicle chassis 01 that meets the airtightness standard through the airtightness test using the airtight tooling 10 is installed on the upper body, the airtightness of the vehicle chassis 01 still meets the airtightness standard, thereby improving the airtightness performance of the vehicle chassis 01 in the whole vehicle and improving the reliability of the whole vehicle.
  • the detection mechanism 20 refers to a detection component, a detection assembly or a detection system that can output detection gas and detect gas pressure or gas flow rate.
  • the airtightness detection system of this embodiment is arranged on the vehicle chassis 01 by replacing the upper body of the vehicle with an airtight tool 10, so as to form a cavity 02 between the sealing surface 11 of the airtight tool 10 and the vehicle chassis 01. Since the vehicle chassis 01 serves as the cavity wall of the cavity, the leakage of the vehicle chassis 01 can be determined by delivering the detection gas into the cavity through the detection mechanism 20 and detecting the air pressure in the cavity, thereby determining the airtightness of the vehicle chassis 01. Therefore, the airtightness detection system provided in this embodiment can realize an independent test of the airtightness of the vehicle chassis 01, and then the vehicle chassis 01 can be delivered as an independent product that meets the airtightness standard, thereby improving the reliability of the vehicle.
  • Figure 2 is a top view of a part of the structure in the embodiment of Figure 1;
  • Figure 3 is a side view of the embodiment of Figure 2;
  • Figure 4 is another side view of the embodiment of Figure 3.
  • the airtight tooling 10 of this embodiment includes: a body 17 and a connecting portion 12, wherein the body 17 is provided with a sealing surface; the connecting portion 12 is arranged around the outer periphery of the body 17, and the connecting portion 12 is configured to be sealed and connected to the vehicle chassis 01.
  • the main body 17 and the connecting part 12 serve as a replica of the connection structure between the upper body and the vehicle chassis 01.
  • the shape, size of the main body 17 and the shape, size, position of the connecting part 12 imitate the upper body, so that the airtight tooling 10 can serve as a replica of the upper body to be connected to the vehicle chassis 01, which can improve the accuracy and effectiveness of the airtightness test of the vehicle chassis 01.
  • connection part 12 is arranged around the outer periphery of the main body 17 , and the connection part 12 is sealed and connected to the vehicle chassis 01 to improve the airtightness of the connection between the airtight tooling 10 and the vehicle chassis 01 , thereby improving the accuracy of the airtightness detection of the vehicle chassis 01 .
  • the main body 17 may be provided in a plate shape, which can reduce the weight of the airtight tooling 10 and save materials.
  • the middle portion of the upper body is raised toward the side away from the vehicle chassis 01
  • the main body 17 is raised relative to the connecting portion 12 toward the side away from the vehicle chassis 01 to expand the volume of the cavity so that more vehicle components can be arranged on the vehicle chassis 01 .
  • the connecting portion 12 is provided with a mounting through hole.
  • the airtightness detection system of this embodiment further includes a mounting column 121 . Part of the mounting column 121 is disposed in the mounting through hole. Part of the mounting column 121 is disposed in a mounting blind hole of the vehicle chassis 01 .
  • the vehicle chassis 01 is connected to the peripheral area of the upper vehicle body through a preset mounting hole and a first mounting column.
  • a mounting through hole is set on the connecting portion 12, and the mounting column 121 cooperates with the mounting through hole and the mounting blind hole on the vehicle chassis 01 to realize the connection between the airtight tooling 10 and the vehicle chassis 01.
  • the connection method between the two can be made consistent with the connection method and connection structure between the upper vehicle body and the vehicle chassis 01, thereby simulating the airtightness state of the vehicle chassis 01 when connected to the upper vehicle body, matching the working conditions of the vehicle chassis 01 under actual use, thereby making the airtightness detection more in line with actual use conditions.
  • the projection of the mounting through hole of the connecting portion 12 on the vehicle chassis 01 coincides with the mounting blind hole, so as to improve the connection reliability and further improve the accuracy of the air tightness detection of the vehicle chassis 01 .
  • connection part 12 can be provided according to the connection structure between the upper body and the vehicle chassis 01.
  • the connection part 12 includes four side parts surrounding the four sides of the body 17, and each side part is provided with two installation through holes arranged at intervals to improve the stability between the airtight tooling 10 and the vehicle chassis 01 and the sealing of the connection.
  • the mounting column 121 may be a stud, and the mounting through hole and the mounting blind hole may be threaded holes.
  • the airtightness detection system further includes a first sealing member 122 , which is disposed between the mounting column 121 and an end of the mounting through hole away from the sealing surface.
  • the airtightness effect at the mounting through hole is increased by the first sealing member 122 , thereby improving the accuracy of airtightness detection of the vehicle chassis 01 .
  • an end of the mounting column 121 away from the vehicle chassis 01 is provided with an abutment portion for abutting against a side of the body 17 away from the cavity, and the first sealing member 122 is located between the abutment portion and the end surface of the mounting through hole away from the cavity.
  • the first sealing member 122 may include a sealing ring.
  • a sealing member may be further provided between the mounting post and the inner wall of the mounting through hole.
  • the airtight tooling 10 is also provided with an air inlet 13 connected to the cavity;
  • the detection mechanism 20 includes: an air duct 21 and an airtight detection component 22; wherein, one end of the air duct 21 is connected to the air inlet 13; the airtight detection component 22 is connected to the other end of the air duct 21, and the airtight detection component 22 transports detection gas to the cavity through the air duct 21 and monitors the air pressure in the cavity.
  • the detection mechanism is realized by the air duct 21 and the airtight detection component 22, and the detection gas is delivered by the air duct 21. Since the position and orientation of the air duct 21 can be adjusted flexibly, the flexibility of movement of the detection mechanism 20 can be improved, and the convenience of airtight detection can be improved.
  • the airtight detection component 22 includes: a gas adapter and a pressure measuring tube; the gas adapter is connected to the other end of the air guide tube 21 for generating detection gas, and the detection end of the pressure measuring tube is arranged in the cavity for testing the air pressure in the cavity.
  • the air tightness detection component 22 is realized by using an air adapter and a pressure measuring tube, which has a simple structure, is easy to operate, and has low cost.
  • the pressure measuring tube may include a pressure balance tube or an air pressure sensor, etc.
  • sealing members such as sealing tape may be used to seal the connections between the gas adapter, the air guide tube 21 , the pressure measuring tube, and the vehicle chassis 01 .
  • the airtightness detection system further includes: a clamp mechanism 14, the clamp mechanism 14 is provided with relatively arranged The first end surface and the second end surface, the first end surface of the clamp mechanism 14 is configured to abut against the side of the airtight tooling 10 away from the cavity, and the second end surface of the clamp mechanism 14 is configured to abut against the side of the vehicle chassis 01 away from the cavity.
  • the airtight tool 10 and the vehicle chassis 01 are clamped by the clamp mechanism 14 to increase the airtightness of the connection between the airtight tool 10 and the vehicle chassis 01, thereby improving the accuracy of the airtightness detection of the vehicle chassis 01.
  • the first end surface of the clamp mechanism 14 is configured to abut against a side of the connecting portion 12 that is away from the cavity.
  • the clamp mechanism 14 of this embodiment includes multiple first clamps 141, and the first clamp 141 is provided with a first end face and a second end face that are relatively arranged, and the first end face of the first clamp 141 is configured to abut against the side of the airtight tooling 10 facing away from the cavity, and the second end face of the first clamp 141 is configured to abut against the side of the vehicle chassis 01 facing away from the cavity.
  • this embodiment realizes clamping between multiple different positions of the airtight tooling 10 and multiple positions of the vehicle chassis 01 through multiple first clamps 141, which can improve the stability between the airtight tooling 10 and the vehicle chassis 01 and the sealing of the connection.
  • the connecting portion 12 includes four side portions surrounding the four sides of the main body 17 , and each side portion is provided with two first clamps 141 spaced apart from each other.
  • the first clamp 141 may be fixed to the connecting portion 12 by means of fixing members such as screws.
  • the clamp mechanism 14 of this embodiment also includes a plurality of second clamps 142, the second clamps 142 are provided with a first end face and a second end face that are relatively arranged, the first end face of the second clamp 142 is configured to abut against the side of the airtight tooling 10 facing away from the cavity, and the second end face of the second clamp 142 is configured to abut against the side of the vehicle chassis 01 facing away from the cavity.
  • this embodiment realizes clamping between multiple different positions of the airtight tooling 10 and multiple positions of the vehicle chassis 01 through multiple second clamps 142, which can improve the stability between the airtight tooling 10 and the vehicle chassis 01 and the sealing of the connection.
  • the connecting portion 12 includes four side portions surrounding four sides of the main body 17 , and each side portion is provided with a second clamp 142 spaced apart from the first clamp 141 .
  • the second clamp 142 of this embodiment is provided with an adjustment mechanism at one end having the first end face, through which the abutment force between the first end face and the connecting part 12 can be flexibly adjusted, thereby adjusting the clamping force between the connecting part 12 and the vehicle chassis 01, which can improve problems such as overpressure and underpressure.
  • the airtightness detection system further includes: a gasket 15 disposed between a first end surface of the fixture mechanism 14 and the airtight tooling 10 and/or between a second end surface of the fixture mechanism 14 and the vehicle chassis 01 .
  • a gasket 15 is arranged between the clamp mechanism 14 and the airtight tooling 10 and/or a gasket 15 is arranged between the clamp mechanism 14 and the vehicle chassis 01, which can improve the overpressure problem between the airtight tooling 10 and the vehicle chassis 01 and improve the reliability of the airtight tooling 10 and the vehicle chassis 01.
  • the gasket 15 is disposed between the first end surface of the clamp mechanism 14 and the connecting portion 12 and/or between the second end surface of the clamp mechanism 14 and the vehicle chassis 01 .
  • the gasket 15 comprises an iron gasket.
  • the present embodiment uses the iron gasket to improve the overpressure problem between the airtight tooling 10 and the vehicle chassis 01, which can significantly improve the overpressure problem and save costs.
  • gaskets made of other materials that meet the requirements may be used to replace the above-mentioned iron gaskets.
  • the airtightness detection system of this embodiment includes: a first positioning portion 16 , which is disposed on the outer periphery of the airtight tooling 10 and is configured to cooperate with a second positioning portion on the vehicle chassis 01 for positioning.
  • the first positioning part 16 is arranged on the airtight tool 10 to realize the positioning between the airtight tool 10 and the vehicle chassis 01, which can improve the efficiency of the airtightness detection of the vehicle chassis 01.
  • Other components of the tooling 10 affect the positioning of the first positioning portion 16 .
  • the first positioning portion 16 is disposed on a side of the connecting portion 12 facing away from the body 17 .
  • the first positioning portion 16 may be a positioning through hole, and a positioning column is provided on the vehicle chassis 01 , and the positioning through hole cooperates with the positioning column to achieve positioning between the airtight tooling 10 and the vehicle chassis 01 .
  • the first positioning portion may also be a positioning pin, which cooperates with a positioning hole on the vehicle chassis for positioning, so that the airtight tooling and the vehicle chassis can be accurately positioned when assembled.
  • the connecting portion 12 includes four side portions surrounding the four sides of the main body 17 , and each side portion is provided with a positioning through hole to achieve rapid and accurate positioning.
  • the airtightness testing system further includes: a transport mechanism 30 connected to the airtightness tooling 10 and configured to transport the airtightness tooling 10 to the vehicle chassis 01 or to move the airtightness tooling 10 from the vehicle chassis 01 after testing.
  • the transport mechanism is used to move the airtight tooling 10, which can improve the efficiency of vehicle chassis airtightness testing.
  • the transport mechanism 30 includes a hanger 31 ; a hook portion 110 is provided on the side of the airtight tooling 10 facing away from the cavity 02 , and the hanger 31 is detachably connected to the hook portion 110 .
  • the transport mechanism 30 is realized by the sling 31, so that the airtight tooling 10 can be quickly separated from the vehicle chassis 01 or installed on the vehicle chassis 01 in the vertical direction, which can reduce the wear between the airtight tooling 10 and the vehicle chassis 01 and improve the detection efficiency.
  • the sling 31 includes a chain, which enables the airtight tooling 10 to be flexibly adjusted in position during transportation, and facilitates accurate positioning of the airtight tooling 10 with respect to the vehicle chassis 01 .
  • Figure 5 is a top view schematic diagram of a partial structure of another embodiment of the airtightness detection system of the present application;
  • Figure 6 is a side view schematic diagram of the embodiment of Figure 5;
  • Figure 7 is another side view schematic diagram of the embodiment of Figure 5.
  • the transport mechanism 30 also includes: a translation mechanism 32, the translation mechanism 32 is configured to carry the airtight tooling 10 to the periphery of the vehicle chassis 01; and the sling 31 is configured to realize the movement of the airtight tooling 10 between the translation mechanism 32 and the vehicle chassis 01.
  • the airtight tooling 10 is carried to the periphery of the vehicle chassis 01 by using the translation mechanism 32 , which can improve the efficiency of transporting the airtight tooling 10 and the efficiency of airtightness testing of the vehicle chassis 01 .
  • the air tightness detection system further includes: a second sealing member for sealing the leaking hole on the vehicle chassis 01 .
  • the leak hole is a perforation reserved for the upper body parts.
  • This embodiment uses the second sealing member to seal the leaking holes on the vehicle chassis 01 , which can reduce the problem of air leakage from these leaking holes and causing the air tightness detection accuracy of the vehicle chassis 01 to be affected.
  • the second sealing member may be a tape or the like, which is easy to disassemble, has low cost, and has little impact on the assembly of other components.
  • the air tightness detection system of the vehicle chassis of this embodiment includes: an airtight tool 10 and a detection mechanism 20, wherein the airtight tool 10 includes: a body 17 and a connection portion 12; wherein the body 17 is provided with a sealing surface, and the body 17 is also provided with an air inlet 13 connected to the cavity 02; a cavity 02 is formed between the sealing surface 11 and the vehicle chassis 01; the connection portion 12 is arranged around the outer periphery of the body 17, and the connection portion 12 is configured to be sealed and connected to the vehicle chassis 01.
  • the detection mechanism 20 includes: an air duct 21, an air adapter and a pressure measuring tube; one end of the air duct 21 is connected to the air inlet 13, and the air adapter is connected to the other end of the air duct 21, for generating detection gas, and the detection end of the pressure measuring tube is arranged in the cavity, for testing the air pressure in the cavity.
  • the connecting portion 12 is provided with a mounting through hole
  • the airtightness detection system of this embodiment further includes a mounting column 121, and a portion of the mounting column 121 is disposed in the mounting through hole, and a portion of the mounting column 121 is disposed in a mounting blind hole of the vehicle chassis 01.
  • the mounting column 121 may be a stud, and the above-mentioned mounting through hole and mounting blind hole may be threaded holes.
  • an end of the mounting post 121 away from the vehicle chassis 01 is provided with an abutment portion for contacting with the body 17 away from the cavity.
  • One side is abutted, and the first sealing member 122 is located between the abutting portion and the end surface of the mounting through hole facing away from the cavity.
  • the airtightness detection system of this embodiment also includes: a plurality of first fixtures 141 and a plurality of second fixtures 142; the first fixture 141 is provided with a first end face and a second end face that are arranged opposite to each other, the first end face of the first fixture 141 is configured to abut against the side of the airtight tooling 10 that is away from the cavity, and the second end face of the first fixture 141 is configured to abut against the side of the vehicle chassis 01 that is away from the cavity.
  • the second fixture 142 is provided with a first end face and a second end face that are arranged opposite to each other, the first end face of the second fixture 142 is configured to abut against the side of the airtight tooling 10 that is away from the cavity, and the second end face of the second fixture 142 is configured to abut against the side of the vehicle chassis 01 that is away from the cavity.
  • the first fixture 141 and the second fixture 142 are arranged at intervals.
  • a gasket 15 such as an iron gasket, is provided between the first fixture 141 and the vehicle chassis 01 , and between the first fixture 141 and the body 17 .
  • a gasket 15 is provided between the second fixture 142 and the vehicle chassis 01 , and between the second fixture 142 and the body 17 .
  • the airtightness detection system of this embodiment also includes: a first positioning portion 16 arranged on the side of the connecting portion 12 away from the main body 17, the first positioning portion 16 is a positioning through hole, and cooperates with the positioning column on the vehicle chassis 01 to achieve positioning between the airtight tooling 10 and the vehicle chassis 01.
  • the airtightness detection system of this embodiment also includes: a hanger 31 for transporting the airtight tooling 10; a hook portion 110 is provided on the side of the airtight tooling 10 facing away from the cavity 02, and the hanger 31 is detachably connected to the hook portion 110.
  • the sling 31 includes a chain and hooks at both ends of the chain.
  • the four corners of the airtight tooling 10 away from the cavity 02 are provided with hooks 110, and the chain includes four branches corresponding to the four hooks 110 to improve the stability of the airtight tooling 10 during transportation.
  • the airtightness detection system of this embodiment also includes: a translation mechanism 32, the translation mechanism 32 is configured to carry the airtight tooling 10 to the periphery of the vehicle chassis 01; the sling 31 is configured to realize the movement of the airtight tooling 10 between the translation mechanism 32 and the vehicle chassis 01.
  • the translation mechanism 32 includes a transport vehicle, and the transport vehicle is further provided with a push-pull handle.
  • the present application further proposes a method for detecting air tightness of a vehicle chassis, as shown in FIG8 , which is a flow chart of an embodiment of the method for detecting air tightness of a vehicle chassis of the present application.
  • the air tightness detection method of the present embodiment is used for the above-mentioned air tightness detection system, and the air tightness detection method of the present embodiment specifically includes the following steps.
  • Step S81 preparing airtight tooling.
  • the airtight fixture can be prepared based on the structure and size of the vehicle's upper body.
  • the sealing surface of the airtight fixture can imitate the connection surface between the upper body and the vehicle chassis, so that after the vehicle chassis meets the airtightness standard through the airtightness test using the airtight fixture, the airtightness of the vehicle chassis still meets the airtightness standard after being installed with the upper body, thereby improving the airtightness performance of the vehicle chassis in the whole vehicle and improving the reliability of the whole vehicle.
  • the main body and the connecting part of the airtight fixture serve as the imitation body of the connection structure between the upper body and the vehicle chassis, and the shape, size, and position of the main body, as well as the shape, size, and position of the connecting part, imitate the upper body.
  • Step S82 Install the airtight tooling on the vehicle chassis.
  • the airtight tooling is transported to the vehicle chassis by using a transport mechanism, and the airtight tooling is positioned by using a first positioning portion; then the positioned airtight tooling and the vehicle chassis are clamped by using a clamp mechanism to install the airtight tooling on the vehicle chassis.
  • Step S83 Connect the detection mechanism to the cavity between the airtight tooling and the vehicle chassis.
  • the air guide tube connected to the air adapter is connected to the air inlet of the cavity, and the detection end of the pressure measuring tube is arranged in the cavity.
  • Step S84 Control the detection mechanism to deliver detection gas into the cavity and monitor the gas pressure in the cavity.
  • the control gas adapter generates the detection gas and inputs it into the cavity through the gas guide tube, and the gas pressure in the cavity is monitored through the pressure measuring tube.
  • the air adapter quickly adjusts the air pressure in the cavity formed by the airtight tooling and the vehicle chassis to a preset INWC (English Inch of water column), and measure the air pressure in the cavity through a pressure measuring tube.
  • INWC American Inch of water column
  • the volume of gas input into the cavity is the volume of gas leaking out of the cavity, which is the leakage value of the vehicle chassis.
  • the air tightness detection system provided in this embodiment can realize independent testing of the air tightness of the vehicle chassis, and then enable the vehicle chassis to be delivered as an independent product that meets the air tightness standards, thereby improving the reliability of the vehicle.
  • the vehicle chassis flows to the airtightness inspection station to do the pre-test preparation work and seal the leaks in the vehicle chassis with sealing tape.
  • a sling to place the airtight tooling on the vehicle chassis, press the sealing tape on the vehicle chassis, and use the positioning pins on the airtight tooling as a guide when placing it to ensure the accuracy of the placement.
  • a clamp to clamp the airtight tooling and the vehicle chassis, and use iron gaskets to isolate the clamping point of the airtight tooling and the vehicle chassis clamp to prevent overpressure.
  • Use a tightening gun to tighten the bolts, that is, tighten the above-mentioned mounting columns to ensure that the bolts are not loose.
  • the bolts are also equipped with sealing rings to ensure that there is no air leakage at the bolt points.
  • sealing tape to seal the air adapter and the pressure balance rod hose.
  • the airtight tester Before starting the test, connect the airtight tester to the power supply, wait for the airtight tester to preheat for 10 minutes, turn on the button on the control panel of the airtight tester, start the test, rotate the wind speed adjustment knob, and observe the pressure rise until the pressure reaches the target pressure (1 inch water column/250Pa) (the test gas is generated by the gas adapter in the airtight tester). After the pressure reaches the target value, record the maximum and minimum values of the flow display screen, and calculate the average leakage (unit: SCFM). The average leakage is less than or equal to the specified leakage. The wind speed adjustment knob is 0, and the average leakage at the target pressure is restarted. A total of three sets of data are tested to determine whether the leakage is less than or equal to the specified leakage. If the leakage values meet the requirements, it can be determined that the vehicle chassis air tightness meets the requirements.
  • SCFM average leakage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

La présente demande divulgue un système et un procédé de test d'étanchéité à l'air pour un châssis de véhicule. Le système de test d'étanchéité à l'air comprend : un outil étanche à l'air pourvu d'une surface d'étanchéité, l'outil étanche à l'air étant conçu pour être agencé sur un châssis de véhicule, et une cavité étant formée entre la surface d'étanchéité et le châssis de véhicule ; et un mécanisme de test en communication avec la cavité, le mécanisme de test transportant un gaz de test vers la cavité et surveillant la pression d'air dans la cavité. Grâce à la présente demande, l'étanchéité à l'air d'un châssis de véhicule peut être testée de manière indépendante, de sorte que le châssis de véhicule puisse être livré en tant que produit indépendant satisfaisant la norme d'étanchéité à l'air, ce qui permet d'améliorer la fiabilité des véhicules.
PCT/CN2024/104249 2023-11-13 2024-07-08 Système et procédé de test d'étanchéité à l'air pour châssis de véhicule Pending WO2025102775A1 (fr)

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CN202311511911.6 2023-11-13
CN202311511911.6A CN119984676A (zh) 2023-11-13 2023-11-13 车辆底盘的气密性检测系统及气密性检测方法

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WO2025102775A1 true WO2025102775A1 (fr) 2025-05-22

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