A transmission chassis dynamometer environmental test chamber

Abstract

This invention discloses a dynamometer environmental test chamber for a transmission chassis, comprising an above-ground test chamber and a pit equipment chamber. The above-ground test chamber is a closed chamber structure, including a light simulation system, an air pressure simulation system, a temperature and humidity simulation system, and a wind simulation system. The pit equipment chamber houses a chassis dynamometer, a steel support system, a central main beam assembly, side beam assemblies, crossbeam assemblies, and thermal insulation materials. This environmental test chamber can simulate conditions such as high pressure and high altitude, high humidity and low humidity, high temperature and low temperature, sunlight, and wind, enabling dynamometer tests to be conducted under different environments. An adjustable pit surface system is formed in the plane where the two chambers intersect, providing both a reliable road support system and excellent thermal insulation, thereby improving the accuracy of the test.

Description

Technical Field

[0001] This invention relates to the field of heavy-duty dynamometer technology, specifically to a transmission chassis dynamometer environmental test chamber. Background Technology

[0002] A chassis dynamometer is an indoor bench testing device used to test the performance of automobiles and engineering vehicles, including power output, emissions under various operating conditions, fuel efficiency, and pure electric range. The dynamometer uses rollers to simulate a road surface, calculates road simulation equations, and employs a loading device to accurately simulate various operating conditions of automobiles and engineering vehicles. It can be used for loading and debugging of automobiles and engineering vehicles, and for diagnosing faults that occur under load conditions. The chassis dynamometer is easy to use, reliable, and unaffected by external conditions. Without disassembling the vehicle, it can accurately and quickly test the performance of various systems and components. The chassis dynamometer can be used for both scientific automotive testing and maintenance inspection.

[0003] For heavy-duty, large vehicles, simple bench-type dynamometers are insufficient. Specialized environmental test chambers are required for dynamometer testing. These chambers typically consist of a surface section and an underground section, used in conjunction to complete the test. Different natural environments are simulated within the chamber, ranging from high temperatures to sub-zero temperatures. Maintaining the surface temperature for extended periods is crucial to prevent the underground equipment from being affected by such drastic temperature changes. Therefore, effective thermal insulation measures are necessary, along with robust stability for heavy-duty load support. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a transmission chassis dynamometer test chamber.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A transmission chassis dynamometer environmental test chamber includes an above-ground test chamber and a pit equipment chamber. The above-ground test chamber is a closed chamber structure and includes a light simulation system, an air pressure simulation system, a temperature and humidity simulation system and a wind simulation system.

[0007] The pit equipment compartment is equipped with a chassis dynamometer, which has multiple dynamometer hubs. The upper outer periphery of the dynamometer hubs is higher than that of the pit equipment compartment. The pit equipment compartment is also equipped with a steel support system. Above the steel support system is a pit surface system. The pit surface system includes a central main beam assembly and a pair of side beam assemblies mounted on the steel support system. The pair of side beam assemblies and the central main beam assembly are assembled together by several crossbeam assemblies to form an adjustable steel structure pavement. The steel structure pavement has several clearance spaces on both sides of the central main beam assembly. The dynamometer hubs are respectively arranged in the clearance spaces and are equipped with heat insulation and sealing components in the clearance spaces.

[0008] The central main beam assembly, the side beam assembly, and the crossbeam assembly each have several independent spaces, and each independent space is filled with thermal insulation material; a pedestrian platform is also provided on the outside of a pair of side beam assemblies, and the pedestrian platform is also supported by the steel support system and docked with the ground of the ground test chamber.

[0009] This transmission chassis dynamometer environmental test chamber, through the setup of above-ground space and a pit space, can form an above-ground environmental simulation chamber and an underground main dynamometer equipment installation chamber. The above-ground test chamber can simulate test environments under different natural conditions through lighting simulation system, air pressure simulation system, temperature and humidity simulation system, and wind simulation system, such as high pressure and high altitude, high humidity and low humidity, high temperature and low temperature, sunlight and wind, etc., enabling dynamometer tests to be conducted under different environments. The pit equipment chamber can reasonably and stably install the chassis dynamometer, and form an adjustable pit surface system in the plane where the two chambers meet. It can provide a reliable road support system and also has excellent thermal insulation effect, which can reduce energy exchange between the upper and lower chambers, maintain the environmental state simulated by the above-ground test chamber, and avoid large fluctuations in temperature and humidity in the pit equipment, so as not to affect the normal operation of various components used to drive the chassis dynamometer, thereby improving the accuracy of the test.

[0010] The steel support system stably and firmly supports the central main beam assembly, side beam assembly, and crossbeam assembly, providing them with sufficient support force, and also freeing up the enclosed space for arranging the chassis dynamometer. The central main beam assembly and a pair of side beam assemblies form a frame structure along the length, which, together with the numerous crossbeam assemblies, creates a relatively flat steel structure road surface, allowing heavy-duty vehicles to drive directly onto the dynamometer hub without the need for additional heavy-duty traction or lifting systems. The central main beam assembly, side beam assembly, and crossbeam assembly are characterized by high load-bearing capacity, easy adjustment, and strong thermal insulation, making them suitable for use in heavy-duty dynamometer environmental test chambers.

[0011] The crossbeam assembly is installed between the central main beam assembly and the side beam assembly using a detachable overlapping and splicing method, which has a certain sealing effect and is convenient for loading and unloading. The position of the crossbeam assembly can be flexibly adjusted. The chassis dynamometer has a multi-axis structure, in which the spacing between the dynamometer hubs in the length direction can be adjusted to adapt to the dynamometer testing of heavy vehicles with different wheelbases. At this time, the crossbeam assembly can be removed, the position of the clearance space can be adjusted, and then the crossbeam assembly can be covered again, so that the steel structure pavement has both load-bearing capacity and flexibility.

[0012] Each independent space is provided within the central main beam assembly, the side beam assembly, and the crossbeam assembly, which can be used to fill the thermal insulation material, thereby enhancing the thermal insulation effect of the entire pit surface system, greatly reducing heat exchange between the above-ground test chamber and the pit equipment chamber, which is beneficial to maintaining the environmental simulation stability of the above-ground test chamber and avoiding the adverse effects of abnormal high and low temperatures on the pit equipment chamber.

[0013] This design not only utilizes the high strength and load-bearing capacity of the steel structure of the central main beam assembly, the side beam assembly, and the crossbeam assembly, but also utilizes the internal space to install thermal insulation materials, eliminating the need for additional thermal insulation and sealing plates, making loading and unloading simpler and more convenient; moreover, the thermal insulation materials can also play a role in sound insulation and noise reduction, as well as vibration reduction and stress buffering, which can enhance the overall support stability.

[0014] The thermal insulation material can be made of materials such as thermal insulation rock wool, fiber cotton, foam, rubber, or gel, which can insulate against both high and low temperatures. Heat-absorbing materials should be avoided, as this would hinder temperature and humidity control in the space above. The thermal insulation sealing assembly creates a certain degree of thermal insulation and sealing at the dynamometer hub, reducing heat exchange there. The dynamometer hub is also equipped with a hub cover, which further contributes to the insulation structure.

[0015] Furthermore, the crossbeam assembly includes a crossbeam frame, with overlapping structures on both sides of the upper part of the crossbeam frame. The overlapping structures on the same crossbeam frame are arranged in opposite directions to allow the overlapping structures of adjacent crossbeam frames to fit together. After the overlapping structures are assembled, they are fixed by several bolts to form a structure flush with the upper surface of the crossbeam frame. The crossbeam frame overlaps with the central main beam assembly and the side beam assembly on both sides along its length direction. The crossbeam frame forms an independent space inside and is filled with the thermal insulation material.

[0016] The overlapping structure facilitates the connection of the crossbeam frames. When tightly arranged, they provide mutual restraint, preventing spontaneous separation and maintaining stability under bolt tightening. The overlapping creates a flat surface for vehicle movement, and the bolt holes increase friction, preventing wheels from slipping on the steel plate. The space within the crossbeam frames can then be filled with thermal insulation material.

[0017] Furthermore, the crossbeam frame is provided with inner end plates at both ends along its length, and the inner side of the inner end plates is provided with reinforcing inner plates along its length; the crossbeam assembly also includes several I-beams, the ends of which are bolted to the central main beam assembly and the side beam assembly via mounting plates, and the height of the I-beams is lower than the location of the overlapping structure.

[0018] The reinforcing inner plate extends inward along the length of the crossbeam frame, further enhancing its strength. Several I-beams typically do not require disassembly and are installed between them as a long-term connection structure, maintaining basic connection strength and positional relationship over extended periods. The overlapping structure can also overlap both sides of the I-beams, and the I-beams may also have steel plates with overlapping structures. The I-beams are primarily located near the dynamometer hub on the fixed base; they may not be located near the dynamometer hub itself, which is used for adjustment.

[0019] Furthermore, the central main beam assembly includes a main beam frame, within which several independent spaces are divided by several main beam partitions and filled with the thermal insulation material. A pair of main beam side plates are respectively provided on both sides of the main beam frame along its length. Several main beam vertical plates are respectively provided between the pair of main beam side plates and the main beam frame. The height of the upper main beam side plate is lower than the upper surface of the main beam frame, so as to form a stepped structure that supports and connects the crossbeam assembly.

[0020] Furthermore, the side beam assembly includes a side beam frame, the interior of which is divided into several independent spaces by several side beam partitions and filled with the thermal insulation material. The side beam frame has a pair of side beam side plates on one side facing the central main beam assembly, and several side beam vertical plates are respectively provided between the pair of side beam side plates and the side beam frame. The height of the upper side beam side plate is lower than the upper surface of the side beam frame to form a stepped structure that supports and connects the crossbeam assembly.

[0021] The central main beam assembly and side beam assembly with this structure have strong connection and support strength, and can also form a stepped structure to support the crossbeam assembly, which facilitates the connection of the crossbeam assembly; the main beam partition and the side beam partition can divide the interior of the main beam and the side beam into several independent spaces, which can be filled with thermal insulation material and also serve as connection and support; the main beam vertical plate and the side beam vertical plate can further enhance the strength and support stability.

[0022] Furthermore, the upper surface of the side beam assembly is provided with several sliding groove plates, which are fixed to the side beam assembly by bolts. The ends of adjacent sliding groove plates abut against each other, and several connecting grooves are provided on the sliding groove plates respectively.

[0023] The height of the side beam assembly is lower than that of the central main beam assembly. The purpose of this height difference is to install the slide plate on the side beam assembly. After installation, the upper surface of the slide plate can be basically flush with the other pit surfaces. The connecting slide plate can be used to install auxiliary equipment, which is generally set on both sides of the vehicle to be measured to assist in vehicle inspection.

[0024] Furthermore, the pedestrian platform is a platform steel plate mounted on the steel support system, and one side of the platform steel plate is connected to the side beam assembly; the platform steel plate and the ground of the ground test chamber are respectively covered with heat-insulating flooring.

[0025] The pedestrian platform is designed for easy connection with the ground. It does not need to bear a large load, so it can be set up more simply. The laying of the thermal insulation floor can form a thermal insulation effect for the entire surrounding ground.

[0026] Furthermore, the pit equipment compartment is also equipped with several heating systems, each including a mounting rod and a heating frame located below the mounting rod, with a heating plate inside the heating frame; the heating systems are arranged at intervals around the chassis dynamometer, and the mounting rod is connected to the steel support system.

[0027] Because these steel beams are required for load-bearing, although the insulation material can block most of the heat, the steel structure itself still conducts some heat. When dynamometer testing is conducted at low temperatures (tens of degrees below zero), the downward conduction of low temperature will lower the temperature of the pit equipment compartment, which is detrimental to the operation of the equipment inside the pit. The heating system can actively heat the pit equipment compartment in this situation, maintaining its normal operating temperature. The heating system is electrically controlled, making it easy to control and creating a surrounding heat source throughout the entire underground space.

[0028] Furthermore, the chassis dynamometer is a dynamometer directly driven by a permanent magnet synchronous motor, including a fixed base and a sliding base disposed in the pit equipment compartment. The dynamometer hub is mounted on the fixed base via a hub support assembly. The sliding base is arranged along the length direction of the pit equipment compartment, and a slide seat is provided above the sliding base. A movable dynamometer hub is mounted on the slide seat via a hub support assembly. When moving the slide seat and the dynamometer hub, the position of the clearance space on the steel structure road surface is changed by disassembling and assembling the crossbeam assembly to accommodate the movement and adjustment of the dynamometer hub.

[0029] Furthermore, the load-bearing capacity of the pit surface system is not less than 15t, the diameter of the dynamometer hub is 2000-3000mm, the temperature range of the above-ground test chamber is -50 to +65 degrees Celsius, and the humidity range is 20-90%.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The transmission chassis dynamometer environmental test chamber can simulate conditions such as high pressure and high altitude, high humidity and low humidity, high temperature and low temperature, sunlight and wind, and can conduct dynamometer tests under different environments; an adjustable pit surface system is formed in the plane where the two chambers intersect, which can provide a reliable road support system and also has excellent heat insulation effect, maintaining the environmental state simulated by the above-ground test chamber, avoiding large fluctuations in temperature and humidity in the pit equipment, so as not to affect the normal operation of various components used to drive the chassis dynamometer, and improving the accuracy of the test; 2. The steel support system can provide sufficient support force and make room for the chassis dynamometer to be arranged in the enclosed space; the central main beam assembly and a pair of side beam assemblies can form a frame structure in the length direction, and together with a large number of crossbeam assemblies, a relatively flat steel structure road surface can be formed. 1. To allow heavy-duty vehicles to drive directly onto the dynamometer hub without the need for additional heavy-duty traction or lifting systems; 2. The crossbeam assembly is installed using a detachable overlapping and splicing method, which not only has a certain sealing effect but also facilitates loading and unloading. The position of the crossbeam assembly can be flexibly adjusted to accommodate dynamometer testing of heavy vehicles with different wheelbases, making the steel structure pavement both load-bearing and flexible; 3. The thermal insulation material is filled into the central main beam assembly, the side beam assembly, and the crossbeam assembly to enhance the thermal insulation effect of the entire pit surface system, greatly reducing heat exchange between the above-ground test chamber and the pit equipment chamber. This helps maintain the environmental simulation stability of the above-ground test chamber and avoids the adverse effects of abnormal high and low temperatures on the pit equipment chamber. Moreover, the thermal insulation material can also play a role in sound insulation and noise reduction, as well as vibration reduction and stress buffering, which can enhance the overall support stability. Attached Figure Description

[0031] Figure 1This is an overall schematic diagram of a transmission chassis dynamometer environmental test chamber according to the present invention;

[0032] Figure 2 This is a schematic diagram of the pit surface system structure of the environmental test chamber of the present invention;

[0033] Figure 3 This is a schematic diagram of the steel support system structure in the pit equipment compartment of the present invention;

[0034] Figure 4 This is a schematic diagram of the main beam assembly, side beam assembly, and cross beam assembly of the present invention;

[0035] Figure 5 This is a schematic diagram of the connection cross-sectional structure of the main beam assembly, side beam assembly and cross beam assembly in the middle part of the present invention;

[0036] Figure 6 This is a schematic diagram of the cross-sectional structure of the main beam assembly, side beam assembly and cross beam assembly in the middle of the present invention;

[0037] Figure 7 This is a schematic diagram of the cross-sectional structure of the beam assembly of the present invention;

[0038] Figure 8 This is a schematic diagram of the splicing of the beam assembly of the present invention;

[0039] Figure 9 This is a schematic diagram of the heating system of the present invention;

[0040] Figure 10 This is a schematic diagram of the layout of the chassis dynamometer of the present invention;

[0041] Figure 11 This is a top view schematic diagram of the pit surface system of the present invention;

[0042] Figure 12 This is a schematic diagram of the thermal insulation and sealing assembly of the present invention;

[0043] In the diagram: 1. Above-ground test chamber; 2. Pit equipment chamber; 3. Light simulation system; 4. Air pressure simulation system; 5. Temperature and humidity simulation system; 6. Wind power simulation system; 7. Dynamometer hub; 8. Steel support system; 9. Pit surface system; 10. Central main beam assembly; 1001. Main beam frame; 1002. Main beam partition; 1003. Main beam side plate; 1004. Main beam vertical plate; 11. Side beam assembly; 1101. Side beam frame; 1102. Side beam partition; 1103. Side beam side plate; 1104. Side beam vertical plate; 12. Crossbeam assembly ; 1201, Crossbeam frame; 1202, Overlap structure; 1203, Inner end plate; 1204, Reinforced inner plate; 1205, I-beam; 13, Clearance space; 14, Pedestrian platform; 15, Slide plate; 16, Independent space; 17, Thermal insulation material; 18, Fixed base; 19, Sliding base; 20, Rotary hub support assembly; 21, Slide seat; 22, Cover; 23, Heating system; 2301, Mounting rod; 2302, Heating frame; 2303, Heating plate; 24, Flexible thermal insulation sealing gasket; 25, Inner folded edge; 26, Magnetic block. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] like Figures 1 to 8 As shown, a transmission chassis dynamometer environmental test chamber includes an above-ground test chamber 1 and a pit equipment chamber 2. The above-ground test chamber 1 is a closed chamber structure with a door, including a light simulation system 3, an air pressure simulation system 4, a temperature and humidity simulation system 5 and a wind simulation system 6.

[0047] The pit equipment compartment 2 is equipped with a chassis dynamometer, which has multiple dynamometer hubs 7. The upper outer periphery of the dynamometer hubs 7 is higher than that of the pit equipment compartment 2. The pit equipment compartment 2 is also equipped with a steel support system 8. Above the steel support system 8 is a pit surface system 9. The pit surface system 9 includes a central main beam assembly 10 and a pair of side beam assemblies 11 mounted on the steel support system 8. The pair of side beam assemblies 11 and the central main beam assembly 10 are assembled together by several crossbeam assemblies 12 to form an adjustable steel structure road surface. The steel structure road surface has several clearance spaces 13 on both sides of the central main beam assembly 10. The dynamometer hubs 7 are respectively arranged in the clearance spaces 13 and have heat insulation and sealing components in the clearance spaces 13.

[0048] The central main beam assembly 10, the side beam assembly 11 and the crossbeam assembly 12 are each provided with several independent spaces 16, and the independent spaces 16 are each filled with thermal insulation material 17; a pedestrian platform 14 is also provided on the outside of a pair of side beam assemblies 11, and the pedestrian platform 14 is also supported by the steel support system 8 and docked with the ground of the ground test chamber 1.

[0049] This transmission chassis dynamometer environmental test chamber, through the setup of above-ground space and pit space, can form an above-ground environmental simulation chamber and an underground main dynamometer equipment installation chamber. The above-ground test chamber 1, through the lighting simulation system 3, air pressure simulation system 4, temperature and humidity simulation system 5, and wind simulation system 6, can simulate test environments under different natural conditions, such as high pressure and high altitude, high humidity and low humidity, high temperature and low temperature, sunlight, and wind, enabling dynamometer tests to be conducted under different environments. The pit equipment chamber 2 can reasonably and stably install the chassis dynamometer, and forms an adjustable pit surface system 9 in the plane where the two chambers meet. It can provide a reliable road support system and also has excellent thermal insulation effect, which can reduce energy exchange between the upper and lower chambers, maintain the environmental state simulated by the above-ground test chamber, and avoid large fluctuations in temperature and humidity in the pit equipment, so as not to affect the normal operation of various components used to drive the chassis dynamometer, thereby improving the accuracy of the test.

[0050] The steel support system 8 can stably and firmly support the central main beam assembly 10, the side beam assembly 11, and the crossbeam assembly 12, providing them with sufficient support force, and can also make room for the chassis dynamometer to be arranged. The central main beam assembly 10 and a pair of side beam assemblies 11 can form a frame structure in the length direction, and together with a large number of crossbeam assemblies 12, can form a relatively flat steel structure road surface, so that heavy-duty vehicles can drive directly onto the dynamometer hub 7 without the need to add a heavy-duty traction system or lifting system.

[0051] The crossbeam assembly 12 is installed between the central main beam assembly 10 and the side beam assembly 11 in a detachable overlapping and splicing manner, which has a certain sealing effect and is also convenient for loading and unloading. The position of the crossbeam assembly 12 can be flexibly adjusted. The chassis dynamometer has a multi-axis structure, in which the spacing between the dynamometer hubs in the length direction can be adjusted to adapt to the dynamometer testing of heavy vehicles with different wheelbases. At this time, the crossbeam assembly can be removed, the position of the clearance space can be adjusted, and then the crossbeam assembly can be covered again, so that the steel structure pavement has both load-bearing capacity and flexibility.

[0052] Each independent space 16 is provided in the central main beam assembly 10, the side beam assembly 11 and the crossbeam assembly 12, which can be used to fill the thermal insulation material 17, enhance the thermal insulation effect of the entire pit surface system 9, greatly reduce the heat exchange between the above-ground test chamber 1 and the pit equipment chamber 2, help maintain the environmental simulation stability of the above-ground test chamber, and avoid the pit equipment chamber from being adversely affected by abnormal high and low temperatures.

[0053] This configuration not only utilizes the high strength and load-bearing capacity of the steel structure of the central main beam assembly 10, the side beam assembly 11, and the crossbeam assembly 12, but also utilizes the internal space to install thermal insulation material, eliminating the need for additional thermal insulation and sealing plates, making loading and unloading simpler and more convenient; moreover, the thermal insulation material can also play a role in sound insulation and noise reduction, as well as vibration reduction and stress buffering, which can enhance the overall support stability.

[0054] The thermal insulation material 17 can be made of materials such as thermal insulation rock wool, fiber cotton, foam, rubber, or gel, which can insulate against both high and low temperatures. Heat-absorbing materials should be avoided, as this would hinder the control of temperature and humidity in the space above. The thermal insulation sealing assembly creates a certain degree of thermal insulation and sealing at the dynamometer hub, reducing heat exchange there. The dynamometer hub is also equipped with a cover 22 on its outer periphery, which further contributes to the insulation structure.

[0055] Furthermore, the crossbeam assembly 12 includes a crossbeam frame 1201, with overlapping structures 1202 respectively provided on the upper two sides of the crossbeam frame 1201. The overlapping structures 1202 on the same crossbeam frame 1201 are arranged in opposite directions to allow the overlapping structures of adjacent crossbeam frames 1201 to fit together. After the overlapping structures 1202 are spliced, they are fixed by several bolts to form a structure flush with the upper surface of the crossbeam frame 1201. The two sides of the crossbeam frame 1201 in the length direction overlap with the central main beam assembly 10 and the side beam assembly 11 respectively. The crossbeam frame 1201 forms the independent space 16 inside and is filled with the thermal insulation material 17.

[0056] The overlapping structure 1202 facilitates the connection of the crossbeam frame 1201. When tightly arranged, they provide mutual restraint, preventing spontaneous separation and maintaining stability under bolt tightening. The overlapping creates a flat surface for vehicle movement, and the bolt holes increase friction, preventing wheel slippage on the steel plate. The space within the crossbeam frame can then be filled with thermal insulation material.

[0057] Furthermore, the two ends of the crossbeam frame 1201 along the length direction are respectively provided with inner end plates 1203, and the inner side of the inner end plates 1203 is also provided with a reinforcing inner plate 1204 along the length direction; the crossbeam assembly 12 also includes several I-beams 1205, the ends of the I-beams 1205 are respectively bolted to the central main beam assembly 10 and the side beam assembly 11 through mounting plates, and the height of the I-beams 1205 is lower than the position of the overlapping structure 1202.

[0058] The reinforcing inner plate 1204 extends inward along the length of the crossbeam frame 1201, further enhancing the strength of the crossbeam frame 1201. Several I-beams 1205 typically do not require disassembly and are installed between these beams as a long-term connection structure, maintaining basic connection strength and positional relationship over a long period. The overlapping structure can also overlap both sides of the I-beams, and the I-beams can also be equipped with steel plates with overlapping structures. The I-beams 1205 are mainly located near the dynamometer hub on the fixed base; they may not be located near the dynamometer hub where adjustment is performed.

[0059] Furthermore, the central main beam assembly 10 includes a main beam frame 1001. The main beam frame 1001 is divided into several independent spaces 16 by several main beam partitions 1002 and filled with the thermal insulation material 17. A pair of main beam side plates 1003 are respectively provided on both sides of the main beam frame 1001 along its length. Several main beam vertical plates 1004 are respectively provided between the pair of main beam side plates 1003 and the main beam frame 1001. The height of the upper main beam side plate 1003 is lower than the upper surface of the main beam frame 1001, so as to form a stepped structure that supports and connects the crossbeam assembly 12.

[0060] Furthermore, the side beam assembly 11 includes a side beam frame 1101. The interior of the side beam frame 1101 is divided into several independent spaces 16 by several side beam partitions 1102 and filled with the thermal insulation material 17. A pair of side beam side plates 1103 are provided on the side of the side beam frame 1101 facing the central main beam assembly 10. Several side beam vertical plates 1104 are respectively provided between the pair of side beam side plates 1103 and the side beam frame 1101. The height of the upper side beam side plate 1103 is lower than the upper surface of the side beam frame 1101, so as to form a stepped structure that supports and connects the cross beam assembly 12.

[0061] The central main beam assembly 10 and side beam assembly 11 with this structure have strong connection and support strength, and can also form a stepped structure to support the crossbeam assembly 12, which facilitates the connection of the crossbeam assembly 12; the main beam partition 1002 and the side beam partition 1102 can respectively divide the interior of the main beam and the side beam into several independent spaces, which can be filled with thermal insulation material and also serve as connection and support; the main beam vertical plate 1004 and the side beam vertical plate 1104 provided on the side can further enhance the strength and support stability.

[0062] Furthermore, the upper surface of the side beam assembly 11 is also provided with a plurality of sliding groove plates 15. The sliding groove plates 15 are fixed to the side beam assembly 11 by bolts, and the ends of adjacent sliding groove plates 15 are abutted together. The sliding groove plates 15 are respectively provided with a plurality of connecting grooves.

[0063] The height of the side beam assembly 11 is lower than that of the central main beam assembly 10. The purpose of this height difference is to set the slide plate 15 on the side beam assembly 11. After this setting, the upper surface of the slide plate 15 can be basically flush with other pit surfaces. The connecting slide plate 15 can be used to install auxiliary equipment. These devices are generally set on both sides of the vehicle to be measured to assist in vehicle inspection.

[0064] Furthermore, the steel support system 8 includes several support columns, which are connected to the pedestrian platform, the central main beam assembly, and the side beam assembly via short beams. Several intersecting diagonal supports are also provided between adjacent support columns.

[0065] Furthermore, the pedestrian platform 14 is a platform steel plate installed on the steel support system 8, and one side of the platform steel plate is connected to the edge of the side beam frame of the side beam assembly; the platform steel plate and the ground of the ground test chamber 1 are respectively covered with heat-insulating flooring.

[0066] The pedestrian platform 14 is designed for easy connection with the surrounding concrete structure. Since it does not bear a large load, its design is simpler. The insulated flooring provides insulation for the entire surrounding ground. A walking passageway can also be formed beneath the pedestrian platform within the pit equipment compartment.

[0067] Furthermore, in combination Figure 1 and Figure 9 As shown, the pit equipment compartment 2 is also equipped with several heating systems 23. Each heating system 23 includes a mounting rod 2301 and a heating frame 2302 located below the mounting rod 2301. A heating plate 2303 is provided inside the heating frame 2302. The heating systems 23 are arranged around the chassis dynamometer at intervals. The mounting rod 2301 is connected to the steel support system.

[0068] Because these steel beams are required for load-bearing, although the insulation material can block most of the heat, the steel structure itself still conducts some heat. When dynamometer testing is conducted at low temperatures (tens of degrees below zero), the downward conduction of low temperature will lower the temperature of the pit equipment compartment, which is detrimental to the operation of the equipment inside the pit. The heating system can actively heat the equipment compartment in this situation to maintain its normal operating temperature. The heating system 23 is electrically controlled, which is convenient to control and can form a surrounding heat source throughout the entire underground space.

[0069] Furthermore, in combination Figure 1 and Figure 10 As shown, the chassis dynamometer is a dynamometer directly driven by a permanent magnet synchronous motor, including a fixed base 18 and a sliding base 19 disposed in the pit equipment compartment 2. The dynamometer hub 7 is mounted on the fixed base 18 via a hub support assembly 20. The sliding base 19 is arranged along the length of the pit equipment compartment, and a slide seat 21 is provided above the sliding base 19. The movable dynamometer hub 7 is mounted on the slide seat 21 via the hub support assembly 20. When moving the slide seat 21 and the dynamometer hub 7, the position of the clearance space on the steel structure road surface is changed by disassembling and assembling the crossbeam assembly 12 to accommodate the movement and adjustment of the dynamometer hub 7.

[0070] Furthermore, the load-bearing capacity of the pit surface system 9 is not less than 15t, the diameter of the dynamometer hub 7 is 2000-3000mm, and the simulated temperature range of the ground test chamber 1 is -50 to +65 degrees Celsius, and the simulated humidity range is 20-90%.

[0071] Furthermore, in combination Figure 11 and Figure 12As shown, the thermal insulation sealing assembly includes a flexible thermal insulation sealing gasket 24. The flexible thermal insulation sealing gasket 24 has a dynamometer hub hole in the middle. The dynamometer hub hole is provided with an inner folded edge 25. The size of the dynamometer hub hole is slightly larger than the size of the exposed part of the dynamometer hub 7. The back of the flexible thermal insulation sealing gasket 24 is provided with several magnetic blocks 26, which are attracted and connected to the crossbeam assembly 12 and the cover 22 through the magnetic blocks 26.

[0072] The flexible thermal insulation sealing gasket 24 can cover the clearance space over a certain length. Due to the cover 22, the clearance space is reduced, which also facilitates the installation of the flexible thermal insulation sealing gasket 24. The flexible thermal insulation sealing gasket 24 does not directly contact the dynamometer hub. The inner folded edge 25 can form a certain internal blocking effect, and the magnetic block 26 facilitates installation and removal.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transmission chassis dynamometer environmental test chamber, characterized in that, It includes an above-ground test chamber and a pit-based equipment chamber. The above-ground test chamber is a closed chamber structure and includes a light simulation system, an air pressure simulation system, a temperature and humidity simulation system, and a wind simulation system. The pit equipment compartment is equipped with a chassis dynamometer, which has multiple dynamometer hubs. The upper outer periphery of the dynamometer hubs is higher than that of the pit equipment compartment. The pit equipment compartment is also equipped with a steel support system. Above the steel support system is a pit surface system. The pit surface system includes a central main beam assembly and a pair of side beam assemblies mounted on the steel support system. The pair of side beam assemblies and the central main beam assembly are assembled together by several crossbeam assemblies to form an adjustable steel structure pavement. The steel structure pavement has several clearance spaces on both sides of the central main beam assembly. The dynamometer hubs are respectively arranged in the clearance spaces and are equipped with heat insulation and sealing components in the clearance spaces. The central main beam assembly, the side beam assembly, and the cross beam assembly each have several independent spaces, and each independent space is filled with thermal insulation material; a pedestrian platform is also provided on the outside of a pair of side beam assemblies, and the pedestrian platform is also supported by the steel support system and docked with the ground of the ground test chamber; The ground-based test chamber simulates a temperature range of -50 to +65 degrees Celsius. The central main beam assembly includes a main beam frame, within which several independent spaces are divided by main beam partitions and filled with the thermal insulation material. A pair of main beam side plates are provided on each side of the main beam frame along its length. Several main beam vertical plates are provided between the pair of main beam side plates and the main beam frame. The height of the upper main beam side plate is lower than the upper surface of the main beam frame, forming a stepped structure that supports and connects the crossbeam assembly. The side beam assembly includes a side beam frame, within which several independent spaces are divided by side beam partitions and filled with the thermal insulation material. A pair of side beam side plates are provided on the side of the side beam frame facing the central main beam assembly. Several side beam vertical plates are provided between the pair of side beam side plates and the side beam frame. The height of the upper side beam side plate is lower than the upper surface of the side beam frame, forming a stepped structure that supports and connects the crossbeam assembly. The thermal insulation sealing assembly includes a flexible thermal insulation sealing gasket, a dynamometer hub hole in the middle of the flexible thermal insulation sealing gasket, an inner folded edge at the dynamometer hub hole, and a plurality of magnetic blocks on the back of the flexible thermal insulation sealing gasket. When the dynamometer hub is installed, a cover is provided on its outer periphery. The flexible thermal insulation sealing gasket is adsorbed and connected to the crossbeam assembly and the cover through the magnetic blocks.

2. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The crossbeam assembly includes a crossbeam frame, with overlapping structures on both sides of the upper part of the crossbeam frame. The overlapping structures on the same crossbeam frame are arranged in opposite directions to allow the overlapping structures of adjacent crossbeam frames to fit together. After the overlapping structures are assembled, they are fixed by several bolts to form a structure flush with the upper surface of the crossbeam frame. The two sides of the crossbeam frame in the length direction overlap with the central main beam assembly and the side beam assembly, respectively. The crossbeam frame forms an independent space inside and is filled with the thermal insulation material.

3. The transmission chassis dynamometer environmental test chamber according to claim 2, characterized in that, The crossbeam frame is also provided with inner end plates at both ends along its length, and the inner side of the inner end plates is also provided with reinforcing inner plates along its length; the crossbeam assembly also includes several I-beams, the ends of which are bolted to the central main beam assembly and the side beam assembly through mounting plates, and the height of the I-beams is lower than the location of the overlapping structure.

4. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The upper surface of the side beam assembly is also provided with several sliding plates. The sliding plates are fixed to the side beam assembly by bolts. The ends of adjacent sliding plates abut against each other. Several connecting grooves are provided on the sliding plates respectively.

5. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The pedestrian platform is a platform steel plate installed on the steel support system, and one side of the platform steel plate is connected to the side beam assembly; the platform steel plate and the ground of the ground test chamber are respectively covered with heat-insulating flooring.

6. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The pit equipment compartment is also equipped with several heating systems, each including a mounting rod and a heating frame located below the mounting rod, with a heating plate inside the heating frame; the heating systems are arranged at intervals around the chassis dynamometer, and the mounting rod is connected to the steel support system.

7. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The chassis dynamometer is a dynamometer directly driven by a permanent magnet synchronous motor, including a fixed base and a sliding base disposed in the pit equipment compartment. The dynamometer hub is mounted on the fixed base via a hub support assembly. The sliding base is arranged along the length direction of the pit equipment compartment, and a slide seat is provided above the sliding base. A movable dynamometer hub is mounted on the slide seat via a hub support assembly. When moving the slide seat and the dynamometer hub, the position of the clearance space on the steel structure road surface is changed by disassembling and assembling the crossbeam assembly to accommodate the movement and adjustment of the dynamometer hub.

8. The transmission chassis dynamometer environmental test chamber according to claim 1, characterized in that, The load-bearing capacity of the pit surface system is not less than 15t, the diameter of the dynamometer hub is 2000-3000mm, and the simulated humidity range is 20-90%.

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