Airtightness testing system and method for vehicle chassis

Abstract

The present application discloses an airtightness testing system and method for a vehicle chassis. The airtightness testing system comprises: an airtight tool provided with a seal surface, the airtight tool being configured to be arranged on a vehicle chassis, and a cavity being formed between the seal surface and the vehicle chassis; and a testing mechanism communicated with the cavity, the testing mechanism conveying a test gas to the cavity and monitoring the air pressure in the cavity. By means of the present application, the airtightness of a vehicle chassis can be independently tested, so that the vehicle chassis can be delivered as an independent product meeting the airtightness standard, thereby improving the reliability of vehicles.

Description

Vehicle chassis air tightness detection system and air tightness detection method

[0001] This application claims priority to Chinese patent application No. 2023115119116, filed on November 13, 2023, entitled “Air tightness detection system and air tightness detection method for vehicle chassis”, which is incorporated herein by reference in its entirety.

Technical field

[0002] 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. [Background Technology]

[0003] Airtightness refers to the property of a device or component that prevents leakage of media within a sealed cavity under specific pressure and time. Airtightness testing of vehicles can reveal defects or wear in vehicle systems or components, as well as compliance with design specifications and quality standards. Poor airtightness can lead to reduced work efficiency and even safety accidents.

[0004] Related technologies seal each vehicle's exhaust vents, maintain a constant pressure inside the vehicle, and measure the amount of air leakage throughout the vehicle. However, as an essential and independent component of a vehicle, the airtightness of the vehicle chassis significantly impacts its overall performance. Therefore, independent testing of the chassis's airtightness is necessary to ensure compliance with standards.

[0005] [Summary of the invention]

[0006] In view of the above problems, 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.

[0007] In order to solve the above technical problems, the present application proposes an airtightness detection system for a vehicle chassis. The airtightness detection system includes: an airtight tooling, which is provided with a sealing surface. The airtight tooling is configured to be set on the vehicle chassis, and a cavity is formed between the sealing surface and the vehicle chassis; a detection mechanism, which is connected to the cavity, and the detection mechanism transports detection gas to the cavity and monitors the air pressure in the cavity.

[0008] The airtightness testing system replaces the vehicle's upper body with an airtight fixture installed on the vehicle chassis. A cavity is formed between the sealing surface of the airtight fixture and the vehicle chassis. Since the vehicle chassis serves as the cavity wall, a testing mechanism delivers test gas into the cavity and measures the air pressure within the cavity to determine air leaks and, therefore, the airtightness of the vehicle chassis. Therefore, the airtightness testing system enables independent testing of the vehicle chassis' airtightness, enabling the vehicle chassis to be delivered as a standalone product that meets airtightness standards, improving vehicle reliability.

[0009] In some embodiments, the airtight tooling includes: a body provided with a sealing surface; and a connecting portion arranged around the outer periphery of the body, the connecting portion being configured to be sealed and connected to a vehicle chassis.

[0010] The connecting portion is arranged around the outer periphery of the main body and is sealed with the vehicle chassis to improve the airtightness of the connection between the airtight tooling and the vehicle chassis, thereby improving the accuracy of the vehicle chassis airtightness detection.

[0011] In some embodiments, the connection portion is provided with a mounting through hole, and the air tightness detection system further includes a mounting column, wherein the mounting column portion is disposed in the mounting through hole, and the mounting column portion is disposed in a mounting blind hole of the vehicle chassis.

[0012] The vehicle chassis and the outer peripheral area of ​​the upper body are connected through preset mounting holes and first mounting columns. A mounting through-hole is set on the connecting part, and the connection between the airtight tooling and the vehicle chassis is realized by cooperating with the mounting through-hole and the mounting blind hole on the vehicle chassis through the mounting column. The connection method between the two can be made consistent with the connection method and connection structure between the upper body and the vehicle chassis, so that the airtightness state of the vehicle chassis and the upper body when connected can be simulated, and the working conditions of the vehicle chassis under actual use are matched, so that the airtightness test is more in line with actual use.

[0013] In some embodiments, the airtightness detection system further includes: a first sealing member disposed between the mounting post and an end portion of the mounting through hole facing away from the sealing surface.

[0014] The first sealing member increases the airtightness of the mounting hole, thereby improving the accuracy of vehicle chassis airtightness testing.

[0015] In some embodiments, the airtight tooling is further 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.

[0016] The detection mechanism is realized through the air duct and the airtight detection component, and the detection gas is transported through the air duct. Since the position and orientation of the air duct are highly flexible in adjustment, the flexibility of the movement of the detection mechanism can be improved, and the convenience of airtight detection can be improved.

[0017] In some embodiments, the airtightness detection assembly includes: a gas adapter connected to the other end of the air duct for generating detection gas; a pressure measuring tube, whose detection end is arranged in the cavity for detecting the air pressure in the cavity.

[0018] The airtightness detection component is realized by using a gas adapter and a pressure measuring tube, which has a simple structure, is easy to operate and has low cost.

[0019] In some embodiments, the airtightness detection system also includes: a clamping 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 the side of the airtight tooling facing away from the cavity, and the second end face is configured to abut against the side of the vehicle chassis facing away from the cavity.

[0020] The airtight tooling is clamped to the vehicle chassis by a clamping 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 test.

[0021] In some embodiments, 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.

[0022] Providing a gasket between the fixture mechanism and the airtight tooling and / or between the fixture mechanism and the vehicle chassis can improve the overpressure problem between the airtight tooling and the vehicle chassis and enhance the reliability of the airtight tooling and the vehicle chassis.

[0023] In some embodiments, the shims include iron shims.

[0024] Because iron gaskets are strong and low in 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.

[0025] In some embodiments, the airtight tooling further includes: a first positioning portion, disposed on the periphery of the airtight tooling, configured to cooperate with a second positioning portion on the vehicle chassis for positioning.

[0026] The first positioning portion is provided on the airtight tooling to achieve positioning between the tooling and the vehicle chassis, which can improve the efficiency of the vehicle chassis airtightness test. The first positioning portion is provided on the periphery of the airtight tooling to reduce the influence of other components of the airtight tooling on the positioning of the first positioning portion.

[0027] In some embodiments, the airtightness testing system further includes: a transport mechanism connected to the airtightness tooling, configured to transport the airtightness tooling to the vehicle chassis or to move the airtightness tooling from the vehicle chassis after testing.

[0028] The efficiency of vehicle chassis air tightness testing can be improved by using a transport mechanism to move the airtight tooling.

[0029] In some embodiments, the transport mechanism includes: a sling; a hook portion is provided on a side of the airtight tooling facing away from the cavity, and the sling is detachably connected to the hook portion.

[0030] The handling mechanism is realized by the sling, 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.

[0031] In some embodiments, 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.

[0032] Since the horizontal range of movement of the sling is small, the airtight tool is loaded to the periphery of the vehicle chassis using a translation mechanism, which can improve the efficiency of the airtight tooling transportation and the efficiency of the vehicle chassis airtightness testing.

[0033] In some embodiments, the air tightness detection system further includes: a second sealing member for sealing the leak hole on the vehicle chassis.

[0034] By using the second sealing member to seal the leak holes on the vehicle chassis, it is possible to reduce the problem of air leakage from these leak holes and thus reduce the accuracy of the vehicle chassis air tightness detection.

[0035] In order to solve the above technical problems, the present application proposes an air tightness detection method for a vehicle chassis, which is used in the above-mentioned air tightness detection system. The air tightness 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.

[0036] Based on this, the air tightness detection system provided in this embodiment can realize independent testing of the air tightness of the vehicle chassis, thereby enabling the vehicle chassis to be delivered as an independent product that meets the air tightness standards, thereby improving the reliability of the vehicle.

[0037] Different from the prior art: The airtightness detection system provided by the present application 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 transports detection gas to the cavity, and monitors the air pressure in the cavity. In the above manner, 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 transported 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 can enable the vehicle chassis to be delivered as an independent product that meets the airtightness standards, thereby improving the reliability of the vehicle.

Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0039] FIG1 is a schematic structural diagram of an embodiment of an air tightness detection system for a vehicle chassis of the present application;

[0040] FIG2 is a schematic top view of a portion of the structure in the embodiment of FIG1 ;

[0041] FIG3 is a schematic side view of the embodiment of FIG2 ;

[0042] FIG4 is another side view of the embodiment of FIG3 ;

[0043] FIG5 is a schematic top view of a partial structure of another embodiment of the airtightness detection system of the present application;

[0044] FIG6 is a schematic side view of the embodiment of FIG5 ;

[0045] FIG7 is another side view of the embodiment of FIG5;

[0046] FIG8 is a flow chart of an embodiment of a method for detecting air tightness of a vehicle chassis according to the present application.

[0047] Figure numerals: vehicle chassis 01, cavity 02, airtight tooling 10, sealing surface 11, connecting part 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 guide tube 21, airtight detection assembly 22, transport mechanism 30, sling 31, translation mechanism 32. [Specific implementation method]

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] A vehicle usually consists of four major parts: the engine, the upper body, the vehicle chassis and the electrical equipment. Among them, 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, 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.

[0057] Airtightness refers to the property of a device or component that prevents leakage of media within a sealed cavity under specific pressure and time. Airtightness testing of vehicles can reveal defects or wear in vehicle systems or components, as well as whether they meet design specifications and quality requirements. Poor airtightness can lead to reduced work efficiency and even safety accidents.

[0058] In related technologies, after sealing each vehicle's exhaust ports, a certain pressure is applied inside the vehicle to measure the amount of air leakage from the entire vehicle. While related technologies have implemented sealing tests for the entire vehicle, no corresponding research has been conducted on the vehicle chassis alone. As an essential and independent product, the airtightness of the vehicle chassis significantly impacts the vehicle's overall performance. The vehicle chassis is delivered as a separate product, and its airtightness must be guaranteed to meet standards. Therefore, independent airtightness testing of the vehicle chassis is necessary.

[0059] Based on this, the airtightness detection system and airtightness detection method proposed in the present application can independently detect the airtightness of the vehicle chassis so that the airtightness of the vehicle chassis meets the standards. Specifically, 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 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 provided in the embodiment of the present application can realize independent testing of the airtightness of the vehicle chassis, and thus can enable the vehicle chassis to be delivered as an independent product that meets the airtightness requirements.

[0060] The air tightness detection system and air tightness detection method provided in this application can be used for air tightness 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.

[0061] The vehicle chassis may be a skateboard chassis or the like.

[0062] In one embodiment, as shown in FIG1 , FIG1 is a schematic structural diagram of an embodiment of an airtightness testing system for a vehicle chassis of the present application. The airtightness testing system for a vehicle chassis of this embodiment includes: an airtight tool 10 and a testing mechanism 20 , wherein the airtight tool 10 has a sealing surface 11 and is configured to be mounted on a vehicle chassis 01 , with a cavity 02 formed between the sealing surface 11 of the airtight tool 10 and the vehicle chassis 01 ; and the testing mechanism 20 is in communication with the cavity 02 , delivering a test gas to the cavity 02 and monitoring the air pressure within the cavity 02 .

[0063] 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 .

[0064] Among them, 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 is tested for airtightness using the airtight tooling 10 and meets the airtightness standard, the airtightness of the vehicle chassis 01 still meets the airtightness standard after being installed on the upper body, thereby improving the airtightness performance of the vehicle chassis 01 in the whole vehicle and improving the reliability of the whole vehicle.

[0065] 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.

[0066] The airtightness detection system of this embodiment is arranged on the vehicle chassis 01 by replacing the vehicle upper body 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 detection mechanism 20 is used to deliver detection gas into the cavity, and the air pressure in the cavity is detected to determine the leakage of the vehicle chassis 01, thereby determining the airtightness of the vehicle chassis 01. Therefore, the airtightness detection system provided by this embodiment can realize independent testing of the airtightness of the vehicle chassis 01, and further enable the vehicle chassis 01 to be delivered as an independent product that meets the airtightness standards, thereby improving the reliability of the vehicle.

[0067] In some embodiments, as shown in Figures 2 to 4, Figure 2 is a schematic top view of a portion of the structure of the embodiment of Figure 1; Figure 3 is a schematic side view of the embodiment of Figure 2; and Figure 4 is a schematic 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 has a sealing surface; the connecting portion 12 is disposed around the outer periphery of the body 17 and is configured to be sealed to the vehicle chassis 01.

[0068] Among them, 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 used with the vehicle chassis 01, which can improve the accuracy and effectiveness of the airtightness test of the vehicle chassis 01.

[0069] The connecting portion 12 is arranged around the outer periphery of the main body 17 and is sealed 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.

[0070] Optionally, the main body 17 may be provided in a plate shape, which can reduce the weight of the airtight tooling 10 and save materials.

[0071] Optionally, the middle portion of the upper body is raised toward the side away from the vehicle chassis 01, and 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.

[0072] In some embodiments, 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, and part of the mounting column 121 is disposed in a mounting blind hole of the vehicle chassis 01 .

[0073] 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. In this embodiment, a mounting through hole is provided 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 of 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 test more in line with actual use.

[0074] 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 thereby improve the accuracy of the air tightness detection of the vehicle chassis 01 .

[0075] Optionally, the connection portion 12 can be provided based on the connection structure between the upper body and the vehicle chassis 01. For example, in this embodiment, the connection portion 12 includes four edges surrounding the four sides of the body 17, each edge having two spaced-apart mounting holes to improve the stability and sealing of the connection between the airtight tooling 10 and the vehicle chassis 01.

[0076] Optionally, the mounting post 121 may be a stud, and the mounting through hole and the mounting blind hole may be threaded holes.

[0077] In some embodiments, the airtightness detection system further includes a first sealing member 122 , which is disposed between the mounting post 121 and an end portion of the mounting through hole facing away from the sealing surface.

[0078] In this embodiment, the first sealing member 122 is used to increase the airtightness effect at the mounting through hole, thereby improving the accuracy of the airtightness detection of the vehicle chassis 01.

[0079] Optionally, an abutment portion is provided on the end of the mounting post 121 facing away from the vehicle chassis 01 for abutting against the side of the body 17 facing 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 facing away from the cavity. The first sealing member 122 may include a sealing ring.

[0080] In other embodiments, a sealing member may be further provided between the mounting post and the inner wall of the mounting through hole.

[0081] In some embodiments, the airtight tooling 10 is further 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.

[0082] In this embodiment, the detection mechanism is realized by the air duct 21 and the airtightness detection component 22, and the detection gas is transported by the air duct 21. Since the position and orientation of the air duct 21 are highly flexible to adjust, the flexibility of the movement of the detection mechanism 20 can be improved, and the convenience of airtightness detection can be improved.

[0083] Of course, in other embodiments, other components or parts that can generate gas, realize gas transportation and detection can also be used to realize the detection mechanism.

[0084] In one embodiment, the airtightness detection component 22 includes: a gas adapter and a pressure measuring tube; the gas adapter is connected to the other end of the gas guide tube 21 for generating detection gas, and the detection end of the pressure measuring tube is set in the cavity for testing the air pressure in the cavity.

[0085] In this embodiment, the airtightness detection assembly 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.

[0086] The pressure measuring tube may include a pressure balance tube or an air pressure sensor, etc.

[0087] Optionally, a sealing member such as a 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 .

[0088] In some embodiments, the airtightness detection system also includes: a clamping mechanism 14, the clamping mechanism 14 is provided with a first end face and a second end face arranged opposite to each other, the first end face of the clamping mechanism 14 is configured to abut against the side of the airtight tooling 10 facing away from the cavity, and the second end face of the clamping mechanism 14 is configured to abut against the side of the vehicle chassis 01 facing away from the cavity.

[0089] In this embodiment, the airtight tooling 10 and the vehicle chassis 01 are clamped by the clamping mechanism 14 to increase 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 .

[0090] Specifically, the first end surface of the clamp mechanism 14 is configured to abut against a side of the connecting portion 12 facing away from the cavity.

[0091] Optionally, 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. 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.

[0092] Among them, this embodiment uses multiple first clamps 141 to achieve clamping between multiple different positions of the airtight tooling 10 and multiple positions of the vehicle chassis 01, which can improve the stability between the airtight tooling 10 and the vehicle chassis 01 and the sealing of the connection.

[0093] In this embodiment, the connecting portion 12 includes four side portions surrounding the four sides of the body 17 , and each side portion is provided with two first clamps 141 spaced apart from each other.

[0094] Optionally, the first clamp 141 may be fixed to the connecting portion 12 by means of fixing members such as screws.

[0095] Optionally, 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.

[0096] Among them, this embodiment uses multiple second clamps 142 to achieve clamping between multiple different positions of the airtight tooling 10 and multiple positions of the vehicle chassis 01, which can improve the stability between the airtight tooling 10 and the vehicle chassis 01 and the sealing of the connection.

[0097] In this embodiment, the connecting portion 12 includes four side portions surrounding the four sides of the body 17 , and each side portion is provided with a second clamp 142 spaced apart from the first clamp 141 .

[0098] The second clamp 142 of this embodiment is provided with an adjustment mechanism at one end where the first end face is provided. The adjustment mechanism can flexibly adjust the abutment force between the first end face and the connecting part 12, thereby adjusting the clamping force between the connecting part 12 and the vehicle chassis 01, which can improve problems such as overpressure and underpressure.

[0099] In some embodiments, the airtightness detection system further includes: a gasket 15 , which is disposed between the first end surface of the fixture mechanism 14 and the airtight tooling 10 and / or between the second end surface of the fixture mechanism 14 and the vehicle chassis 01 .

[0100] In this embodiment, a gasket 15 is set between the clamp mechanism 14 and the airtight tooling 10 and / or a gasket 15 is set 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.

[0101] Specifically, 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 .

[0102] In some embodiments, the gasket 15 comprises an iron gasket.

[0103] Since iron gaskets are strong and have low cost, this embodiment uses iron gaskets 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.

[0104] Of course, in other embodiments, gaskets made of other materials that meet the requirements can be used to replace the above-mentioned iron gaskets.

[0105] Optionally, the airtightness detection system of this embodiment includes: a first positioning portion 16 , which is provided on the periphery of the airtight tooling 10 and is configured to cooperate with a second positioning portion on the vehicle chassis 01 for positioning.

[0106] In this embodiment, a first positioning portion 16 is provided on the airtight tooling 10 to achieve positioning with respect to the vehicle chassis 01, thereby improving the efficiency of airtightness testing of the vehicle chassis 01. Furthermore, the first positioning portion 16 is provided on the periphery of the airtight tooling 10 to reduce the influence of other components of the airtight tooling 10 on the positioning of the first positioning portion 16.

[0107] Optionally, the first positioning portion 16 is provided on a side of the connecting portion 12 facing away from the body 17 .

[0108] Optionally, the first positioning portion 16 may be a positioning through hole, and a positioning column is provided on the vehicle chassis 01 . The positioning through hole cooperates with the positioning column to achieve positioning between the airtight tooling 10 and the vehicle chassis 01 .

[0109] In other embodiments, 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.

[0110] 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 fast and accurate positioning.

[0111] In some embodiments, the airtightness testing system further includes: a transport mechanism 30 connected to the airtight tooling 10 and configured to transport the airtight tooling 10 to the vehicle chassis 01 or to move the airtight tooling 10 from the vehicle chassis 01 after testing.

[0112] In this embodiment, the transport mechanism is used to move the airtight tooling 10 , thereby improving the efficiency of vehicle chassis airtightness testing.

[0113] In some embodiments, the transport mechanism 30 includes a sling 31 ; a hook portion 110 is provided on a side of the airtight tooling 10 facing away from the cavity 02 , and the sling 31 is detachably connected to the hook portion 110 .

[0114] This embodiment implements the transport mechanism 30 through 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.

[0115] Optionally, the sling 31 includes a chain, which enables the airtight tooling 10 to be flexibly adjusted in position during transportation, and facilitates accurate positioning thereof with respect to the vehicle chassis 01 .

[0116] In some embodiments, as shown in Figures 5 to 7 (Figure 5 is a schematic top view of a portion of another embodiment of the airtightness testing system of the present application, Figure 6 is a schematic side view of the embodiment of Figure 5, and Figure 7 is another schematic side view of the embodiment of Figure 5), the transport mechanism 30 further includes: a translation mechanism 32 configured to carry the airtight tooling 10 to the periphery of the vehicle chassis 01; and a sling 31 configured to facilitate movement of the airtight tooling 10 between the translation mechanism 32 and the vehicle chassis 01.

[0117] Since the horizontal range of movement of the sling 31 is relatively small, the translation mechanism 32 is used to carry the airtight tooling 10 to the periphery of the vehicle chassis 01 , which can improve the efficiency of transporting the airtight tooling 10 and the efficiency of airtightness testing of the vehicle chassis 01 .

[0118] In some embodiments, the air tightness detection system further includes: a second sealing member for sealing the leaking hole on the vehicle chassis 01 .

[0119] Among them, the leak hole is a perforation reserved for the upper body parts.

[0120] This embodiment utilizes the second sealing member to seal the leaking holes on the vehicle chassis 01 , thereby reducing the problem of air leakage from these leaking holes causing an inaccurate detection of the air tightness of the vehicle chassis 01 .

[0121] Optionally, the second sealing member may be a tape, etc., which is easy to disassemble, low in cost, and has little impact on the assembly of other components.

[0122] In one embodiment, as shown in Figures 1 to 4 , the vehicle chassis airtightness testing system of this embodiment includes: an airtight tool 10 and a testing mechanism 20. The airtight tool 10 includes: a body 17 and a connecting portion 12. The body 17 is provided with a sealing surface and an air inlet 13 connected to the cavity 02. The cavity 02 is formed between the sealing surface 11 and the vehicle chassis 01. The connecting portion 12 is arranged around the outer periphery of the body 17 and is configured to be sealed with the vehicle chassis 01. The testing mechanism 20 includes: an air duct 21, a gas adapter, and a pressure measuring tube. One end of the air duct 21 is connected to the air inlet 13, and the gas adapter is connected to the other end of the air duct 21 for generating test gas. The detection end of the pressure measuring tube is disposed in the cavity for testing the air pressure within the cavity.

[0123] There are parts on the mounting surface of the vehicle chassis 01 and the airtight tooling 10, and the airtight tooling 10 needs to avoid them accordingly.

[0124] Furthermore, the connecting portion 12 is provided with a mounting through-hole. The airtightness detection system of this embodiment further includes a mounting post 121. The mounting post 121 is partially disposed within the mounting through-hole and partially disposed within a mounting blind hole of the vehicle chassis 01. The mounting post 121 may be a stud, and the aforementioned mounting through-hole and mounting blind hole may be threaded holes.

[0125] Furthermore, an end of the mounting post 121 facing away from the vehicle chassis 01 is provided with an abutment portion for abutting against a side of the body 17 facing 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 facing away from the cavity.

[0126] Furthermore, the airtightness testing system of this embodiment also includes: a plurality of first fixtures 141 and a plurality of second fixtures 142; the first fixture 141 has 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 being configured to abut against the side of the airtight tooling 10 that faces away from the cavity, and the second end face of the first fixture 141 being configured to abut against the side of the vehicle chassis 01 that faces away from the cavity. The second fixture 142 has 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 being configured to abut against the side of the airtight tooling 10 that faces away from the cavity, and the second end face of the second fixture 142 being configured to abut against the side of the vehicle chassis 01 that faces away from the cavity. The first fixture 141 and the second fixture 142 are spaced apart.

[0127] 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 .

[0128] Furthermore, 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.

[0129] Furthermore, the airtightness detection system of this embodiment also includes: a sling 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 sling 31 is detachably connected to the hook portion 110.

[0130] Optionally, the sling 31 includes a chain and hooks at both ends of the chain. Hooks 110 are provided at the four corners of the airtight tooling 10 facing away from the cavity 02. The chain includes four branches corresponding to the four hooks 110 to improve the stability of the airtight tooling 10 during transportation.

[0131] In another embodiment, as shown in Figures 5 to 7, 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.

[0132] Optionally, the translation mechanism 32 includes a transport vehicle, and the transport vehicle is further provided with a push-pull handle.

[0133] The present application further proposes a method for detecting the air tightness of a vehicle chassis, as shown in Figure 8. Figure 8 is a flow chart of an embodiment of the method for detecting the air tightness of a vehicle chassis of the present application. The air tightness detection method of this embodiment is used in the above-mentioned air tightness detection system. The air tightness detection method of this embodiment specifically includes the following steps.

[0134] Step S81: preparing an airtight tooling.

[0135] Airtight fixtures can be prepared based on information such as the structure and dimensions of the vehicle's upper body. The sealing surface of the airtight fixture can mimic the connection between the upper body and the vehicle chassis. This ensures that even after the vehicle chassis meets airtightness standards through airtightness testing using the airtight fixture, the vehicle chassis's airtightness will still meet these standards after being installed on the upper body. This improves the airtightness performance of the vehicle chassis within the entire vehicle, thereby enhancing the reliability of the entire vehicle. For example, the main body and connecting portion of the airtight fixture serve as a replica of the connection structure between the upper body and the vehicle chassis. The shape and dimensions of the main body, as well as the shape, dimensions, and position of the connecting portion, mimic those of the upper body.

[0136] Step S82: Install the airtight tooling on the vehicle chassis.

[0137] The airtight tooling is transported to the vehicle chassis by using a transport mechanism, and is positioned by using a first positioning portion; the positioned airtight tooling and the vehicle chassis are then clamped by using a clamping mechanism to install the airtight tooling on the vehicle chassis.

[0138] Step S83: connecting the detection mechanism to the cavity between the airtight tooling and the vehicle chassis.

[0139] 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 set in the cavity.

[0140] Step S84: Control the detection mechanism to deliver detection gas into the cavity and monitor the gas pressure in the cavity.

[0141] 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.

[0142] Specifically, the gas adapter quickly adjusts the air pressure in the cavity formed by the airtight tooling and the vehicle chassis to a preset INWC (inches of water column) and measures the air pressure in the cavity through a pressure measuring tube. By maintaining this pressure, 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.

[0143] Based on this, the air tightness detection system provided in this embodiment can realize independent testing of the air tightness of the vehicle chassis, thereby enabling the vehicle chassis to be delivered as an independent product that meets the air tightness standards, thereby improving the reliability of the vehicle.

[0144] In one application scenario, the vehicle chassis flows to the airtightness inspection station for preparatory work before testing, and the leaks in the vehicle chassis are sealed with sealing tape. Use a sling to lower the airtight tooling onto the vehicle chassis, pressing the sealing tape on the vehicle chassis. When lowering the tooling, use the positioning pins on the airtight tooling as a guide to ensure accurate positioning. Use a clamp to clamp the airtight tooling and the vehicle chassis, and use iron gaskets to isolate the clamping point between 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. Use sealing tape to seal the air adapter and the pressure balance rod hose.

[0145] Before starting the test, connect the air tightness tester to the power supply, wait for the air tightness tester to preheat for 10 minutes, turn on the button on the air tightness tester control panel, 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 air tightness tester). After the pressure reaches the target value, record the maximum and minimum values ​​on the flow display screen and calculate the average leakage (unit: SCFM). The average leakage is less than or equal to the specified leakage. Set the wind speed adjustment knob to 0 and restart the test of the average leakage at the target pressure. Test a total of three sets of data 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.

[0146] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An air tightness detection system for a vehicle chassis, the air tightness detection system comprising: An airtight tooling is 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, and the detection mechanism delivers detection gas to the cavity and monitors the gas pressure in the cavity.

2. The airtightness detection system according to claim 1, wherein: The airtight tooling comprises: A body, provided with the sealing surface; The connecting portion is arranged around the outer periphery of the main body, and the connecting portion is configured to be sealed and connected to the vehicle chassis.

3. The airtightness detection system according to claim 2, wherein: The connecting portion is provided with a mounting through hole, and the air tightness detection system further comprises a mounting column, wherein a portion of the mounting column is arranged in the mounting through hole, and a portion of the mounting column is arranged in a mounting blind hole of the vehicle chassis.

4. The airtightness detection system according to claim 3, wherein: The airtightness detection system also includes: The first sealing member is arranged between the mounting column and the end of the mounting through hole away from the sealing surface.

5. The airtightness detection system according to any one of claims 1 to 4, wherein: The airtight tooling is also provided with an air inlet connected to the cavity; the detection mechanism comprises: An air guide tube, one end of which is connected to the air inlet; The airtight detection component 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.

6. The airtightness detection system according to claim 5, wherein: The airtight detection component comprises: A gas adapter, connected to the other end of the gas guide tube, for generating the detection gas; A pressure measuring tube, whose detection end is arranged in the cavity, is used to detect the air pressure in the cavity.

7. The airtightness detection system according to any one of claims 1 to 6, wherein: The airtightness detection system also includes: The clamp mechanism is provided with a first end face and a second end face which are arranged opposite to each other, wherein the first end face is configured to abut against a side of the airtight tooling away from the cavity, and the second end face is configured to abut against a side of the vehicle chassis away from the cavity.

8. The airtightness detection system according to claim 7, wherein: The airtightness detection system also includes: A gasket is arranged between the first end surface and the airtight tooling and / or between the second end surface and the vehicle chassis.

9. The airtightness detection system according to claim 8, wherein: The gasket comprises an iron gasket.

10. The airtightness detection system according to any one of claims 1 to 9, wherein: The airtight tooling also includes: The first positioning portion is arranged on the outer periphery of the airtight tooling and is configured to cooperate with the second positioning portion on the vehicle chassis for positioning.

11. The airtightness detection system according to any one of claims 1 to 9, wherein: The airtightness detection system also includes: The transport mechanism is connected to the airtight tooling and is configured to transport the airtight tooling to the vehicle chassis or to move the airtight tooling from the vehicle chassis after inspection.

12. The airtightness detection system according to claim 11, wherein: The transport mechanism comprises: a sling; a hook portion is provided on the side of the airtight tooling away from the cavity, and the sling is detachably connected to the hook portion.

13. The airtightness detection system according to claim 12, wherein: The transport mechanism also includes: The translation mechanism is configured to load the airtight tool to the periphery of the vehicle chassis; the lifting device is configured to realize the movement of the airtight tool between the translation mechanism and the vehicle chassis.

14. The airtightness detection system according to any one of claims 1 to 13, wherein: The airtightness detection system also includes: The second sealing member is used to seal the leakage hole on the vehicle chassis.

15. A vehicle chassis air tightness detection method, used in the air tightness detection system according to any one of claims 1 to 14, the air tightness detection method comprising: preparing the airtight tooling; Installing the airtight tooling on a vehicle chassis of the vehicle; Connecting the detection mechanism to the cavity between the airtight tooling and the vehicle chassis; The detection mechanism is controlled to deliver detection gas into the cavity, and the gas pressure in the cavity is monitored.

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