A general test tool for air spring of commercial vehicle chassis

Abstract

A kind of commercial vehicle chassis air spring universal test tool, including upper universal test tool and lower universal test tool, upper universal test tool and lower universal test tool are connected with the upper cover plate and lower cover plate of air spring to be detected respectively, while upper universal test tool and lower universal test tool are connected with test equipment respectively, air spring to be detected is installed between upper universal test tool and lower universal test tool;Replaceable joint and plug are provided on upper universal test tool and / or lower universal test tool.The utility model can effectively solve the problems of long auxiliary operation time of air spring test and inconvenient operation, and improve test efficiency by installing a set of air spring multifunctional universal test tool on air spring to be detected, and then testing air spring to be detected with multifunctional universal test tool.

Description

Technical Field

[0001] This utility model relates to a tooling for testing automotive parts, and more particularly to a universal testing tooling for commercial vehicle chassis air springs; this universal testing tooling for commercial vehicle chassis air springs can reduce auxiliary operation time during various tests and effectively improve the operation efficiency during testing; it belongs to the field of automotive parts testing technology. Background Technology

[0002] With the development of automobile manufacturing technology and people's increasing demands for travel comfort, more and more cars are now using air springs, and more and more commercial vehicles are adopting air springs in their chassis. Commercial vehicle air springs have become the core component of automobile air suspension systems, improving vehicle driving stability and comfort by adjusting vehicle height, damping and stiffness, and are widely used in the commercial vehicle field.

[0003] On the other hand, because air springs have become a core component of automotive air suspension systems, the requirements for air springs in passenger vehicles are becoming increasingly stringent. Commercial vehicle air springs, however, are elastic elements that use compressed air as a medium and leverage the compressibility of gas to achieve elasticity. To ensure their safety and reliability, they require extensive testing before use, including: 1. Air tightness test: Check the air tightness of the air spring to ensure that it will not leak gas when subjected to pressure. This is usually done by inflating and holding the air spring to a certain pressure, then closing the inlet valve and observing the pressure change over a period of time. If the pressure remains stable, the air tightness is good; otherwise, the leak point needs to be located and repaired.

[0004] 2. Dynamic elasticity test: Set the length of the air spring at a specific height, set the amplitude, frequency, loading period, and pressure, and record the load-displacement curves for each cycle. The deviation should be within the specified range.

[0005] 3. Isothermal pressure variation characteristic test: Set the length of the air spring at a specific height, set the amplitude, frequency, loading period, and pressure, and record the load-deformation curve and internal pressure-deformation curve under each pressure gradient. The deviation should be within the specified range.

[0006] 4. Isothermal and isobaric characteristic test: Set the length of the air spring at the initial height, set the initial air pressure value, and reduce the fixed pressure value each time (keep the air source connected and keep the pressure stable after the pressure is established), compress to the specified height and hold for a certain time, and then stretch to the specified height at a certain speed. Record the load-deformation curve and internal pressure-deformation curve under each pressure gradient. The deviation should be within the specified range.

[0007] 5. Destructive test (water explosion test): Determine the maximum pressure that the air spring can withstand, i.e., the burst pressure, to ensure its safety and reliability in actual use and avoid the air spring from breaking and failing due to excessive pressure.

[0008] 6. Bench Fatigue Test: This involves subjecting the air springs to high-frequency, low-amplitude fatigue tests over extended periods to simulate the vibrations experienced during long-term vehicle use. This accelerates the aging and wear of the air springs, thereby predicting their fatigue life. During the fatigue test, it is necessary to monitor changes in the air spring's performance in real time, such as a decrease in stiffness or leakage.

[0009] These tests need to be performed on different testing equipment, requiring the commercial vehicle air springs to be tested to be disassembled and reassembled multiple times on different testing equipment for different performance tests. Since the air spring mounting platforms of various testing equipment are different, different testing fixtures are currently configured according to different testing equipment. When conducting tests on different testing equipment, different configurations of testing fixtures must be installed on the air springs to be tested in order to perform different tests. However, this requires the installation of testing fixtures multiple times, which not only increases auxiliary operation time, but also easily damages the air springs to be tested due to repeated disassembly and reassembly. Therefore, it is necessary to improve this process.

[0010] The search revealed no identical technical reports, only technical literature in related fields. The most similar articles are as follows: 1. Patent application number CN202311541765.1, entitled "An Air Spring Test Monitoring Device and Application Method," filed by China FAW Group Corporation, discloses an air spring test monitoring device and application method, including an air compressor, a three-way pipe, an air spring, a pressure sensor, an ammeter, multiple indicator lights, a vibration sensor, a relay, and a power supply. The power supply provides power to all electrical components. The air compressor, air spring, and pressure sensor are interconnected via the three-way pipe. The air compressor is used to charge and discharge air into the air spring. The pressure sensor is connected to the relay and identifies the gas pressure value inside the air spring. After converting the gas pressure value into an electrical signal, it is transmitted to the ammeter via the relay. The identified gas pressure current signal is displayed on the ammeter. A second indicator light monitors the circuit operation. A vibration sensor is installed on the air spring and is connected to the relay. The vibration sensor detects the air spring's operation via a first indicator light. This technical solution only addresses the testing of a single device and does not involve the testing of multiple stations and multiple devices, therefore the aforementioned problem does not exist.

[0011] 2. Patent document CN110779708A discloses a durability testing method for air springs, including the following steps: Step S1, at least three sets of air springs are taken in a single batch, and three environmental temperatures (low temperature, normal temperature, and high temperature) are set for each set of air springs. The test environments for the three sets of air springs are isolated from each other, and each air spring is further isolated; Step S2, the upper end of each air spring is fixed along its extension direction; multiple air springs are driven and compressed at one time through a cam drive. By changing the shape of the cam plate, different amplitudes and frequencies of compression can be achieved for the air springs, simulating the compression experienced by the springs in a driving environment. The low-temperature and high-temperature resistance performance of the air springs is tested by setting separate temperature environments. The technical solution disclosed in this patent only involves single stiffness and fatigue resistance tests, and does not involve the operation of multiple devices, therefore it does not address the aforementioned issues.

[0012] 3. Patent publication number CN108801622B discloses a three-dimensional composite loading fatigue testing device and method for air springs. The device includes a support, a transverse loading component for applying a transverse dynamic load to the air spring, a vertical loading component for applying a vertical dynamic load to the air spring, and a longitudinal offset component for causing longitudinal deformation of the air spring. The transverse loading component is mounted on the support along the front-rear direction of the air spring. The longitudinal offset component is mounted on the transverse loading component, and its positioning on the transverse loading component is adjustable. The air spring is mounted on the longitudinal offset component, and the vertical loading component is mounted vertically above the air spring and in contact with it. This patent document also refers to the testing of a single device and does not address the testing of multiple devices.

[0013] The aforementioned patents all involve the testing of air springs, but current testing methods only consider the testing of a single device and do not take into account the testing of multiple devices. As testing technology develops, the number of items to be tested for air springs is increasing, and how to reduce the auxiliary operation time of testing has become a pain point in improving the testing effect; therefore, further research and improvement are still needed. Utility Model Content

[0014] The technical problem to be solved by this utility model is that, in view of the shortcomings of existing multi-item combination testing of air springs for commercial vehicle chassis, such as the need to change test fixtures multiple times, long auxiliary operation time, and easy damage to the air springs under test, a universal test fixture for air springs for commercial vehicle chassis is provided. This universal test fixture for air springs for commercial vehicle chassis can meet the tooling requirements of various test equipment with one set of fixtures, effectively shortening the auxiliary operation time and avoiding multiple disassembly and assembly of the air springs under test.

[0015] This utility model is mainly achieved through the following technical solution: a universal testing fixture for air springs of commercial vehicle chassis, including an upper universal testing fixture and a lower universal testing fixture, which are respectively connected to the upper cover plate and the lower cover plate of the air spring to be tested, and are also respectively connected to testing equipment. The air spring to be tested is installed between the upper universal testing fixture and the lower universal testing fixture; replaceable joints and plugs are provided on the upper universal testing fixture and / or the lower universal testing fixture.

[0016] Furthermore, the upper and lower universal test fixtures are double-layer plate structures. One layer is an air spring connecting plate that connects to the upper and lower cover plates of the air spring to be tested, and the other layer is an equipment connecting plate that connects to the test equipment. A connecting post connects the air spring connecting plate and the equipment connecting plate, forming an operating cavity between them. The air spring connecting plate connected to the air spring to be tested within the operating cavity is provided with stud clearance holes and replaceable connector mounting holes, with the replaceable connector mounting holes positioned at the air inlet of the air spring to be tested. The air spring connecting plates on both the upper and lower universal test fixtures are provided with countersunk screw holes that mate with the air spring to be tested. These countersunk screw holes correspond to the external connecting holes on the air spring to be tested. The countersunk screws connect the air spring connecting plates on both the upper and lower universal test fixtures to the upper and lower cover plates of the air spring to be tested, respectively.

[0017] Furthermore, a replaceable connector is screwed onto the replaceable connector hole, and the replaceable connector is directly screwed onto the air inlet of the air spring to be tested. The outlet of the replaceable connector is connected to the outlet pipeline of the working air source or water source of the testing equipment through a gas source or water source connection connector, forming a channel for the air spring to be tested to enter and exit gas or liquid during the testing process; the testing equipment provides the testing gas or liquid to the air spring to be tested through the replaceable connector.

[0018] Furthermore, the gas source or water source connection connector is a water explosion connector, which has a "T" shaped pipe structure and includes three outlets; one outlet is connected to a replaceable connector, and the other two are symmetrically arranged, distributed vertically, one being a water inlet pipe and the other being a water outlet pipe, which are respectively connected to the water inlet pipe of the water explosion equipment and the water outlet pipe of the water explosion equipment.

[0019] Furthermore, the upper and lower universal test fixtures are respectively connected to the test equipment by having multiple elongated "U"-shaped grooves on the equipment connection plates of the upper and lower universal test fixtures. The distribution of the elongated "U"-shaped grooves matches the screw holes or bolt positions of the upper and lower mounting plates on the test equipment. During the test, bolts are inserted into the elongated "U"-shaped grooves to connect the equipment connection plates of the upper and lower universal test fixtures to the upper and lower mounting plates of the test equipment.

[0020] Furthermore, the number of the elongated "U"-shaped grooves is the same as the number of screw holes or bolts on the upper and lower mounting plates of the test equipment, and the plane center of the equipment connection layer of the upper and lower general-purpose test fixtures is arranged radially.

[0021] Furthermore, the number of the elongated "U"-shaped grooves is 12, corresponding to the number of screw holes or bolts that are multiples of 4 or 6 on the upper and lower mounting plates of the test equipment.

[0022] The beneficial effects of this utility model are: This invention utilizes a universal testing fixture pre-installed on the upper and lower end connecting plates with a detection air spring. This universal testing fixture can adapt to the testing needs of various testing equipment, thus greatly shortening auxiliary testing time and improving testing efficiency. Its main advantages include: 1. This utility model installs universal testing fixtures on the upper and lower parts of the air spring to be tested, so that the air spring to be tested can be tested on multiple different testing equipment without the need for additional installation work. All air spring testing can be completed by one set of fixtures, which can save a lot of auxiliary operation time, manpower and material resources. 2. The universal testing fixture of this utility model adopts a double-layer structure, forming a working space between the air spring to be tested and the testing platform, facilitating the installation of air or water source inlet and outlet interfaces; all operations are concentrated on the equipment connection plate in the working space, which is both convenient and safe. 3. This utility model uses a water-exploding pipe to draw water and gas inlets from the double-layer working cavity, which makes it easier for operators to connect and simplifies the installation of inlet and outlet pipelines. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the general-purpose testing and inspection tooling of this utility model; Figure 2 This is a schematic diagram of another structure of the general-purpose testing fixture of this utility model; Figure 3 This is a schematic diagram of the connection structure between the general testing fixture of this utility model and the air spring to be tested; Figure 4This is a three-dimensional structural diagram of the universal testing and experimental fixture of this utility model; Figure 5 This is a three-dimensional structural diagram of the universal testing and inspection fixture of this utility model from another perspective; Figure 6 This is a schematic diagram of the overall structure of the general-purpose test fixture of this utility model; Figure 7 This is a schematic diagram of the connection structure between the replacement connector and the gas or water source connection connector of this utility model. Figure 8 This is a schematic diagram of the gas or water source connection connector structure of this utility model; Figure 9 This is a schematic diagram of the replaceable connector structure of this utility model; Figure 10 A schematic diagram of a structure for mounting on a gas or water source connection connector; Figure 11 A schematic diagram of a structure for installing a gas or water source connection connector at the bottom; Figure 12 This is a schematic diagram of the installation of this utility model on the testing equipment.

[0024] Explanation of reference numerals: 1. Upper universal test fixture; 2. Lower universal test fixture; 3. Air spring to be tested; 4. Upper cover plate; 5. Lower cover plate; 6. Replaceable connector; 7. Plug; 8. Air spring connecting plate; 9. Equipment connecting plate; 10. Stud clearance hole; 11. Replaceable connector mounting hole; 12. Connecting column; 13. Air source or water source connection connector; 14. Long pipe outlet; 15. Water inlet pipe; 16. Water outlet pipe; 17. Long strip "U" groove; 18. Replaceable connector outlet; 19. Countersunk screw hole; 20. Countersunk screw; 21. External connection hole; 22. Upper and lower mounting plates. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] A universal testing fixture for air springs in commercial vehicle chassis includes an upper universal testing fixture 1 and a lower universal testing fixture 2. The upper universal testing fixture 1 and the lower universal testing fixture 2 are respectively connected to the upper cover plate 4 and the lower cover plate 5 of the air spring 3 to be tested. Simultaneously, the upper universal testing fixture 1 and the lower universal testing fixture 2 are also respectively connected to testing equipment. The air spring 3 to be tested is installed between the upper universal testing fixture 1 and the lower universal testing fixture 2. Replaceable connectors 6 and plugs 7 are provided on the upper universal testing fixture 1 and / or the lower universal testing fixture 2. (See attached...) Figure 1 and 2 As shown.

[0027] Furthermore, the upper universal test fixture 1 and the lower universal test fixture 2 are structural components with a double-layer plate structure. One layer is an air spring connecting plate 8 that connects to the upper cover plate 4 and the lower cover plate 5 of the air spring 3 to be tested, and the other layer is an equipment connecting plate 9 that connects to the test equipment. The air spring connecting plate 8 and the equipment connecting plate 9 are connected by a connecting post 12, and an operating cavity is formed between the air spring connecting plate 8 and the equipment connecting plate 9. A stud clearance hole 1 is provided on the air spring connecting plate 8 connected to the air spring 3 to be tested in the operating cavity. 0 and replaceable connector mounting hole 11, and the replaceable connector mounting hole 11 is located at the air inlet position of the air spring 3 to be tested; and the air spring connecting plate 8 on the upper universal test fixture 1 and the lower universal test fixture 2 is provided with countersunk screw holes 19 that match the air spring to be tested. The countersunk screw holes 19 correspond to the external connecting holes 21 on the air spring 3 to be tested. The air spring connecting plate 8 on the upper universal test fixture 1 and the lower universal test fixture 2 is connected to the upper cover plate 4 and the lower cover plate 5 of the air spring 3 to be tested respectively by countersunk screws 20 (as shown in the attached figure). Figure 3 (As shown).

[0028] Furthermore, a replaceable connector 6 is screwed onto the replaceable connector hole, and the replaceable connector 6 is directly screwed onto the air inlet of the air spring 3 to be tested. The outlet 18 of the replaceable connector is connected to the outlet pipeline of the working air source or water source of the testing equipment through the air source or water source connection connector 13, forming a channel for the air spring 3 to enter and exit gas or liquid during the testing process; the testing equipment provides the testing gas or liquid to the air spring 3 to be tested through the replaceable connector 6. The replaceable connector 6 can be connected to the air source or water source connection connector 13 by connecting it to the replaceable connector mounting hole 11 on the equipment connection plate 9 of the upper general-purpose test fixture 1 and / or the lower general-purpose test fixture 2, forming multiple connection methods. See attached... Figure 9 The replaceable connector 6 connects to the equipment connection plate 9 of the general-purpose test fixture 1; (Attached) Figure 10 The replaceable connector 6 is connected to the equipment connection plate 9 of the lower general-purpose test fixture 2; the replaceable connector 6 is then connected to the air source or water source connection connector 13.

[0029] Furthermore, the gas or water source connection connector 13 is a water explosion connector, which has a "T" shaped pipe structure and includes three outlets; one of them is a long pipe outlet 14, which is connected to the replaceable connector 6; the other two are symmetrically arranged, distributed vertically, one is a water inlet pipe 15 and the other is a water outlet pipe 16, which are respectively connected to the water inlet pipe of the water explosion equipment and the water outlet pipe of the water explosion equipment (not shown in the figure).

[0030] Furthermore, the upper universal testing fixture 1 and the lower universal testing fixture 2 are respectively connected to the testing equipment. Multiple elongated "U"-shaped grooves 17 are formed on the equipment connection plates 9 of the upper universal testing fixture 1 and the lower universal testing fixture 2. The distribution of the elongated "U"-shaped grooves 17 matches the screw holes or bolt positions of the upper and lower mounting plates on the testing equipment. During testing, bolts are inserted into the elongated "U"-shaped grooves 17 to connect the equipment connection plates 9 of the upper universal testing fixture 1 and the lower universal testing fixture 2 to the upper and lower mounting plates 22 of the testing equipment (as shown in the attached figure). Figure 11 (As shown).

[0031] Furthermore, the number of the elongated "U"-shaped grooves 17 is the same as the screw holes or bolts on the upper and lower mounting plates of the test equipment, and the equipment connecting layer 9 of the upper general test fixture 1 and the lower general test fixture 2 are arranged radially at their center planes.

[0032] Furthermore, the number of the elongated "U"-shaped grooves 17 is 12, corresponding to the number of screw holes or bolts that are multiples of 4 or 6 on the upper and lower mounting plates of the test equipment.

[0033] It should be noted that the above-listed embodiments are merely a clear and complete description of the technical solution of this utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are only for clarity of description and not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. Simultaneously, the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and purposes achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A universal testing fixture for air springs in commercial vehicle chassis, characterized in that: It includes an upper universal test fixture and a lower universal test fixture, which are respectively connected to the upper cover plate and the lower cover plate of the air spring to be tested. At the same time, the upper universal test fixture and the lower universal test fixture are also respectively connected to the test equipment. The air spring to be tested is installed between the upper universal test fixture and the lower universal test fixture. Replaceable joints and plugs are provided on the upper universal test fixture and / or the lower universal test fixture.

2. The universal testing fixture for commercial vehicle chassis air springs as described in claim 1, characterized in that: The upper and lower universal test fixtures are double-layer plate structures. One layer is an air spring connecting plate that connects to the upper and lower cover plates of the air spring to be tested, and the other layer is an equipment connecting plate that connects to the test equipment. A connecting post connects the air spring connecting plate and the equipment connecting plate, forming an operating cavity between them. Within the operating cavity, the air spring connecting plate connected to the air spring to be tested has stud clearance holes and replaceable connector mounting holes, with the replaceable connector mounting holes positioned at the air inlet of the air spring. The air spring connecting plates on both the upper and lower universal test fixtures have countersunk screw holes that mate with the external connecting holes on the air spring to be tested. These countersunk screw holes are connected to the upper and lower cover plates of the air spring to be tested via countersunk screws.

3. The universal testing fixture for commercial vehicle chassis air springs as described in claim 2, characterized in that: The replaceable connector hole is screwed with a replaceable connector, which is directly screwed onto the air inlet of the air spring to be tested. The outlet of the replaceable connector is connected to the outlet pipeline of the working air source or water source of the testing equipment through a gas source or water source connection connector, forming a channel for the air spring to be tested to enter and exit gas or liquid during the testing process. The testing equipment provides the testing gas or liquid to the air spring to be tested through the replaceable connector.

4. The universal testing fixture for commercial vehicle chassis air springs as described in claim 3, characterized in that: The gas or water source connection connector is a water explosion connector, which has a "T" shaped pipe structure and includes three outlets; one outlet is connected to a replaceable connector, and the other two are symmetrically arranged, distributed vertically, one being a water inlet pipe and the other being a water outlet pipe, which are respectively connected to the water inlet pipe of the water explosion equipment and the water outlet pipe of the water explosion equipment.

5. The universal testing fixture for commercial vehicle chassis air springs as described in claim 2 or 3, characterized in that: The upper and lower universal test fixtures are respectively connected to the test equipment. Multiple elongated "U"-shaped grooves are opened on the equipment connection plates of the upper and lower universal test fixtures. The distribution of the elongated "U"-shaped grooves matches the screw holes or bolt positions of the upper and lower mounting plates on the test equipment. During the test, the equipment connection plates of the upper and lower universal test fixtures are connected to the upper and lower mounting plates of the test equipment by inserting bolts into the elongated "U"-shaped grooves.

6. The universal testing fixture for commercial vehicle chassis air springs as described in claim 5, characterized in that: The number of the elongated "U"-shaped grooves is the same as the number of screw holes or bolts on the upper and lower mounting plates of the test equipment. The equipment connection plates of the upper and lower general-purpose test fixtures are arranged radially at their center planes.

7. The universal testing fixture for commercial vehicle chassis air springs as described in claim 6, characterized in that: The number of the elongated "U"-shaped grooves is 12, corresponding to the number of screw holes or bolts that are multiples of 4 or 6 on the upper and lower mounting plates of the test equipment.

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