Rail vehicle secondary suspension system and method for adjusting the height of the floor of a car body

Abstract

The rail vehicle secondary suspension system connects the bogie and the carriage floor, and comprises a height adjustment mechanism fixed to the bogie and a rubber vibration isolator fixed to the carriage floor. The height adjustment mechanism comprises a box body fixed to the bogie and filled with lubricating grease or lubricating oil, an electric worm gear installed in the box body, and an expansion piece installed in the box body in the vertical direction and having a self-locking function. The expansion piece is in transmission connection with the electric worm gear, and is fixed to the rubber vibration isolator and is extended and retracted with the transmission of the electric worm gear to drive the rubber vibration isolator to rise and fall. The present application ensures the consistency of the height of the carriage floor after adjustment, avoids the inclination and deflection of the floor caused by different loads, improves the convenience, accuracy and reliability of the height adjustment of the carriage floor, has a simple structure, light weight, low manufacturing and maintenance cost, keeps the normal height of the carriage floor during the load process, ensures the stability of the vehicle during driving, and improves the riding comfort. The present application also provides a height adjustment method of the carriage floor.

Description

Technical Field

[0001] This invention relates to a secondary suspension system for rail vehicles and a method for adjusting the floor height of the carriage, belonging to the technical field of rail vehicle floor height adjustment. Background Technology

[0002] The secondary suspension system, installed between the car body and bogie of railway passenger trains and urban rail vehicles, directly affects the vehicle's dynamic qualities such as curve maneuvering safety and running smoothness. Simultaneously, the height of the car body floor relative to the bogie must always be maintained at the design standard height, and cannot be altered by changes in load. The secondary suspension system is one of the key technologies of railway vehicle bogies.

[0003] In passenger trains and urban rail vehicles, when the load increases during passenger boarding, the car floor will sink below the standard height; when the load decreases during passenger disembarkation, the car floor will rise above the standard height. This requires a specialized system to adjust the floor height, ensuring it remains at the required standard level for passenger safety and convenience, as well as for overall vehicle safety. Previously, rail vehicles primarily used air springs as the secondary suspension system, adjusting the floor height by inflating and deflating the rubber air bladders. This floor height adjustment system has the following drawbacks:

[0004] 1. The inflation and deflation of the rubber air bladder of the air spring requires a special air source and air pipeline, which has many drawbacks such as high manufacturing and maintenance costs of the air source and air pipeline, relatively heavy weight, and complex air pipeline layout.

[0005] 2. Generally, a carriage is equipped with two or four air springs. Due to factors such as vehicle layout and passenger distribution, the air springs in areas with concentrated passengers have a large load capacity and compression, while the air springs in areas with fewer passengers have a small load capacity and compression. This results in different compression values ​​for each air spring, making it difficult and time-consuming to level the carriage floor. Even after leveling, the carriage body still has a large deflection, and the carriage floor is prone to tilting or swaying, affecting passenger comfort.

[0006] The existing patent documents retrieved include:

[0007] 1.CN202323453612.X - An electric sightseeing vehicle with adjustable floor height;

[0008] 2. CN202010836295.1 - A magnetic levitation air suspension height adjustment system and adjustment method;

[0009] 3. CN201921101399.7 - An air spring and rail vehicle capable of horizontal limiting in a confined space;

[0010] 4. CN201810997947.2 - Methods and systems for controlling the lifting and lowering of rail vehicles;

[0011] 5.CN201410008904.9-Air spring suspension mechanism for low-floor rail vehicle bogies. Summary of the Invention

[0012] The secondary suspension system for rail vehicles provided by this invention can independently adjust each system according to passenger distribution and the inclination of the car floor to compensate for height differences in the car floor caused by changes in passenger weight. This ensures the consistency of the car floor height after adjustment, avoids floor tilting and swaying due to different loads, and improves the convenience, accuracy, and reliability of car floor height adjustment. The system is simple in structure, lightweight, and has low manufacturing and maintenance costs. It allows the car floor to maintain a normal height during load-bearing, ensuring vehicle stability and improving passenger comfort. This invention also provides a method for adjusting the car floor height.

[0013] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0014] A secondary suspension system for rail vehicles, connecting the bogie and the car floor, includes a height adjustment mechanism fixedly connected to the bogie and rubber vibration isolators fixedly connected to the car floor. The height adjustment mechanism comprises a housing fixedly connected to the bogie and filled with grease or lubricating oil, an electric worm gear installed within the housing, and a telescopic component installed vertically within the housing with a self-locking function. The telescopic component is driven by the electric worm gear, extends out of the housing and is fixedly connected to the rubber vibration isolator, and extends and retracts with the transmission of the electric worm gear, thereby raising and lowering the rubber vibration isolator.

[0015] Preferably, an elastic body is connected between the housing and the rubber vibration isolator, and the elastic body deforms elastically as the rubber vibration isolator rises and falls.

[0016] Preferably, the electric worm gear includes a worm connected to a motor on the housing, a worm wheel meshing with the worm, and a telescopic component including a rotatable sleeve installed in the housing and a screw rod installed in the sleeve. The worm wheel is keyed and fitted onto the sleeve, and the upper end of the screw rod extends out of the housing and is fixedly connected to the rubber vibration isolator.

[0017] Preferably, tapered roller bearings are press-fitted to both ends of the threaded sleeve, the tapered roller bearings are assembled in the housing and are axially positioned by a positioning nut fastened to the threaded sleeve, and the positioning nut and the housing are sealed with a sealing ring.

[0018] Preferably, the rubber vibration isolator includes a conical metal outer sleeve, a conical metal inner sleeve located in the inner cavity of the metal outer sleeve, and a rubber body that vulcanizes and connects the metal outer sleeve and the metal inner sleeve. A through hole is opened on the metal inner sleeve along the central axis, and the upper end of the screw passes through the through hole and is fixedly connected to the metal inner sleeve. At least one layer of conical metal partition is vulcanized in the rubber body. The top of the metal outer sleeve is fixedly connected to the floor of the carriage, and a vertical distance is formed between the metal inner sleeve and the metal outer sleeve.

[0019] Preferably, the elastomer is a rubber sealing ring connected between the metal inner sleeve and the housing. The upper end face of the elastomer is bonded to the metal inner sleeve, and the lower end face is bonded to the housing. The elastomer is sleeved outside the screw and its inner diameter is larger than the outer diameter of the screw.

[0020] The method for adjusting the height of the carriage floor, employing the aforementioned secondary suspension system for rail vehicles, is characterized by:

[0021] The standard height of the car floor under normal load conditions is determined by adjusting the number of secondary suspension systems of the rail vehicle between the bogie and the car floor, the stiffness and height of the rubber vibration isolators, based on the load-bearing capacity of a single car and the operating conditions of the vehicle's running line.

[0022] The electric worm gear is connected to the vehicle's floor height detection system. When the vehicle floor sinks below a predetermined standard height, the floor height detection system sends a lifting signal to the electric worm gear. The electric worm gear then extends the telescopic component until the vehicle floor is raised to the standard height. When the vehicle floor rises above the predetermined standard height, the floor height detection system sends a lowering signal to the electric worm gear. The electric worm gear then retracts the telescopic component until the vehicle floor descends to the standard height.

[0023] Preferably, adjusting the stiffness of the rubber vibration isolator refers to adjusting the initial stiffness of the rubber vibration isolator and the variable stiffness characteristics of the rubber vibration isolator during the load-bearing process by adjusting the hardness of the rubber body and the number of metal partitions in the rubber vibration isolator. Adjusting the height of the rubber vibration isolator refers to adjusting the vertical distance between the inner metal sleeve and the outer metal sleeve of the rubber vibration isolator in the unloaded free state.

[0024] Preferably, "connecting the electric worm gear to the vehicle's floor height detection system signal control" means that the motor on the housing is a servo motor with a servo driver, the servo driver is connected to the floor height detection system signal, and the servo driver receives the signal sent by the floor height detection system and controls the operation of the servo motor.

[0025] The beneficial effects of the invention are:

[0026] The secondary suspension system for rail vehicles of the present invention features a telescopic component in the height adjustment mechanism that extends and retracts with the transmission of an electric worm gear, thereby raising and lowering the rubber vibration isolator. Both the electric worm gear and the telescopic component have a self-locking function, ensuring that the telescopic component is locked after being adjusted to the correct height and will not extend or retract on its own due to changes in load, thus forming rigid support for the rubber vibration isolator. Each set of the aforementioned secondary suspension system for rail vehicles can be adjusted independently, based on passenger distribution and the inclination of the car floor, to compensate for differences in car floor height caused by changes in passenger weight, ensuring consistency in car floor height after adjustment, avoiding floor tilting and swaying due to different loads, and improving the convenience, accuracy, and reliability of car floor height adjustment.

[0027] Compared to existing height adjustment structures that connect air lines and air sources via air springs, the electric worm gear and telescopic mechanism offers higher load-bearing stability and support reliability. It effectively controls the tilt and sway of the cargo box floor during load-bearing, improving the cargo box's carrying capacity and stability. The height adjustment accuracy is higher, the structure is simpler, lighter, and manufacturing and maintenance costs are lower. This ensures the cargo box floor maintains a normal height during load-bearing, guaranteeing vehicle stability. Rubber vibration isolators mounted above the adjustment mechanism isolate vibrations transmitted upwards from the bogie to the cargo box floor and buffer floor vibrations during vehicle operation, ensuring the stability of the vehicle's secondary suspension system, reducing the cargo box floor's float rate, improving floor stability, and enhancing passenger comfort. Attached Figure Description

[0028] Figure 1 This is a schematic diagram showing the connection between the secondary suspension system of the rail vehicle and the car floor of the present invention.

[0029] Figure 2 for Figure 1 A sectional view. Detailed Implementation

[0030] The following is combined Figures 1-2 The embodiments of the present invention will be described in detail below.

[0031] A secondary suspension system for rail vehicles, connecting the bogie and the car floor, includes a height adjustment mechanism fixedly connected to the bogie and a rubber vibration isolator 1 fixedly connected to the car floor 100. The height adjustment mechanism comprises a housing 2 fixedly connected to the bogie and filled with grease or lubricating oil, an electric worm gear 3 installed inside the housing 2, and a telescopic member 4 vertically installed inside the housing 2 with a self-locking function. The telescopic member 4 is connected to the electric worm gear 3 via a transmission connection. The telescopic member 4 extends out of the housing and is fixedly connected to the rubber vibration isolator 1, extending and retracting with the transmission of the electric worm gear 3 and driving the rubber vibration isolator 1 to rise and fall.

[0032] In the secondary suspension system of the rail vehicle described above, the telescopic component 4 in the height adjustment mechanism extends and retracts with the transmission of the electric worm gear 3, thereby driving the rubber vibration isolator 1 to rise and fall. Both the electric worm gear 3 and the telescopic component 4 have a self-locking function, so that the telescopic component 4 is locked after being adjusted to the correct height and will not extend or retract on its own due to changes in load, thus forming a rigid support for the rubber vibration isolator. Each set of the secondary suspension system of the rail vehicle can be adjusted independently. Each system can be adjusted independently according to the passenger distribution and the inclination of the car floor to compensate for the height difference of the car floor caused by changes in passenger weight, ensure the consistency of the car floor height after adjustment, avoid floor tilting and swaying caused by different loads, and improve the convenience, accuracy and reliability of car floor height adjustment. Compared to existing height adjustment structures that connect air lines and air sources via air springs, the electric worm gear 3 plus telescopic component 4, the height adjustment mechanism offers higher load-bearing stability and support reliability. It effectively controls the tilt and sway of the cargo box floor during load-bearing, improving the cargo box's carrying capacity and stability. The height adjustment accuracy is higher, the structure is simpler, lighter, and manufacturing and maintenance costs are lower. This ensures the cargo box floor maintains a normal height during load-bearing, guaranteeing vehicle stability. A rubber vibration isolator 1, mounted above the adjustment mechanism, isolates vibrations transmitted upwards from the bogie to the cargo box floor and buffers vibrations during vehicle operation, ensuring the stability of the vehicle's secondary suspension system, reducing the cargo box floor's float rate, improving cargo box floor stability, and enhancing passenger comfort.

[0033] An elastic body is connected between the housing and the rubber vibration isolator. The elastic body deforms elastically as the rubber vibration isolator rises and falls. The elastic body 5 buffers the speed of the rubber vibration isolator 4 during the rising and falling process through deformation, preventing the rubber vibration isolator 4 from causing the carriage floor to rise and fall instantaneously, improving the stability of the carriage floor during the rising and falling process, forming a flexible rising and falling process, reducing the passenger's perception during the floor rising and falling process, and improving the riding comfort.

[0034] The electric worm gear 3 includes a worm 31 connected to a motor 6 on the housing 2 and a worm wheel 32 meshing with the worm 31. The telescopic component 4 includes a rotatable screw sleeve 41 installed in the housing 2 and a screw 42 installed in the screw sleeve. The worm wheel 32 is keyed and fitted onto the screw sleeve 41. The upper end of the screw 42 extends out of the housing and is fixedly connected to the rubber vibration isolator 1. The worm 31 and worm wheel 32 form a power pair, converting the output power of the motor 6 into the rotation of the worm wheel 32, which drives the screw sleeve 41 to rotate via a key connection. The rotation of the screw sleeve 41 causes the screw 42 to rise and fall within the screw sleeve 41, forming the extension and retraction of the telescopic component 4. Both the threaded mating pair formed by the screw sleeve 41 and the screw 42, and the worm power pair formed by the worm 31 and the worm wheel 31, have a self-locking function, locking the screw 42 once it stops rising and falling. This provides stable support for the rubber vibration isolator, preventing it from rising and falling due to changes in load. The adjustment has high reliability and stability. The screw 42 of each system rises and falls independently via a servo motor, and the lifting and lowering adjustments of multiple systems are independent of each other. The adjustment is simple and convenient, and the height can be adjusted separately according to different loads, ensuring that the floor height of different load areas in the carriage is basically the same, making the overall height of the carriage floor basically consistent and reducing the tilt and sway angle of the carriage floor. The screw sleeve 41 and the screw 42 can be assembled with either ordinary threads or ball threads.

[0035] The tapered roller bearings 7 are press-fitted to both ends of the threaded sleeve 41. The tapered roller bearings 7 are assembled within the housing and axially positioned by a locating nut 8 fastened to the threaded sleeve 41. A sealing ring seals the locating nut 8 with the housing 2. The tapered roller bearings 7 and the threaded sleeve 41 axially position the threaded sleeve 41, allowing it to rotate without axial movement. The locating nut 8 axially positions the tapered roller bearings 7 onto the housing 2, preventing loosening and improving structural reliability. The sealing ring between the locating nut 8 and the housing 2 seals the tapered roller bearings within the housing 1, preventing dust and impurities from entering and extending the service life of the tapered roller bearings 7.

[0036] The rubber vibration isolator 1 includes a conical metal outer sleeve 9, a conical metal inner sleeve 10 located in the inner cavity of the metal outer sleeve 9, and a rubber body 11 that vulcanizes the metal outer sleeve 9 and the metal inner sleeve 10. A through hole is opened on the metal inner sleeve 10 along the central axis. The upper end of the screw 42 passes through the through hole and is fixedly connected to the metal inner sleeve 10. At least one layer of conical metal partition 12 is vulcanized in the rubber body 11. The top of the metal outer sleeve 9 is fixedly connected to the carriage floor 100. A vertical distance is formed between the metal inner sleeve 10 and the metal outer sleeve 9. The rubber vibration isolator 1 isolates the vibration of the bogie and buffers the vibration of the car floor during vehicle operation. The metal outer sleeve 9, the metal inner sleeve 10, and the rubber body 11 are vulcanized into a conical whole. There is a vertical gap between the metal outer sleeve 9 and the metal inner sleeve 10. During the load-bearing process, the metal outer sleeve 9 and the metal inner sleeve 10 can form relative motion, causing the rubber body 11 to deform and form damping vibration reduction. The vulcanized connecting metal partition 12 inside the rubber body 11 can improve the stiffness of the rubber body, so that the rubber vibration isolator 1 has variable stiffness characteristics during the load-bearing process, improves its vibration reduction performance, and improves the stability of the car floor.

[0037] The elastic body 5 is a rubber sealing ring connecting the metal inner sleeve 10 and the housing 2. The upper end face of the elastic body 5 is bonded to the metal inner sleeve 10, and the lower end face is bonded to the housing 2. The elastic body 5 is fitted over the screw 42, and its inner diameter is larger than the outer diameter of the screw 42. The elastic body 5 is bonded between the bottom of the metal inner sleeve 10 and the top surface of the housing 2. As the rubber vibration isolator 1 rises, the elastic body 5 stretches between the metal inner sleeve 10 and the housing 2. As the rubber vibration isolator 1 falls, the elastic body 5 is compressed between the metal inner sleeve 10 and the housing 2. The deformation of the elastic body 5 buffers the rise and fall of the rubber vibration isolator 1, preventing the screw 42 from causing the rubber vibration isolator 1 to rise or fall instantaneously, forming a flexible lifting process, reducing the passenger's perception during the floor lifting process, and improving riding comfort. The elastomer 5 does not contact the screw 42, thus avoiding interference from the deformation of the elastomer 5 with the movement of the screw 42. The elastomer 5 is bonded to the outer periphery of the screw 42 and sandwiched between the metal inner sleeve 10 and the housing 2, forming a seal on the opening of the screw sleeve 41. This prevents dust and impurities from entering the screw sleeve 41, avoids the failure of the screw 42's height adjustment due to impurities entering the screw sleeve 41, extends the assembly service life of the screw sleeve 41 and the screw 42, and improves the structural reliability of the system.

[0038] This invention also protects a method for adjusting the height of a car floor, employing the above-described secondary suspension system for rail vehicles, characterized in that:

[0039] The standard height of the car floor under normal load conditions is determined by adjusting the number of secondary suspension systems of the rail vehicle between the bogie and the car floor, the stiffness and height of the rubber vibration isolators 1, based on the load-bearing capacity of a single car and the operating conditions of the vehicle's running line.

[0040] The electric worm gear 3 is connected to the vehicle's floor height detection system for signal control. When the vehicle floor sinks below a predetermined standard height, the floor height detection system sends a lifting signal to the electric worm gear, which then extends the telescopic component until the vehicle floor is raised to the standard height. When the vehicle floor rises above the predetermined standard height, the floor height detection system sends a lowering signal to the electric worm gear, which then extends the telescopic component until the vehicle floor descends to the standard height.

[0041] The above-described method for adjusting the car floor height first determines the number of secondary suspension systems required for each car based on the load-bearing capacity of a single car and the operating conditions of the railway line. This ensures the car floor is evenly supported. Then, considering the stiffness of the rubber vibration isolators 1 and their height when unloaded, the standard height of the car floor under normal load conditions is determined. This standard height refers to the height the car floor needs to maintain during load-bearing. Finally, during vehicle operation, the height is individually adjusted according to the corresponding position of each secondary suspension system to compensate for height differences caused by changes in passenger weight. This ensures the consistency of the adjusted car floor height, avoids floor tilting and swaying due to varying loads, and improves the convenience of car floor height adjustment. Accuracy and reliability: The floor height detection system detects the real-time height of the carriage floor and sends a lifting or lowering signal to the electric worm gear 3 based on the comparison between the detected real-time height and the determined standard height. When the carriage floor sinks below the determined standard height, the floor height detection system sends a lifting signal to the electric worm gear 3. When the carriage floor rises above the determined standard height, the floor height detection system sends a lowering signal to the electric worm gear 3. When the electric worm gear 3 receives a lifting signal, it drives the telescopic component 4 to extend; when it receives a lowering signal, it drives the telescopic component 4 to shorten. After the extension or shortening is in place, both the electric worm gear 3 and the telescopic component 4 stop moving, forming a self-locking mechanism. This results in higher load-bearing stability and support reliability, effectively controlling the tilt and sway of the carriage floor during the load-bearing process, and improving the carriage's carrying capacity and transport stability.

[0042] Adjusting the stiffness of the rubber vibration isolator 1 refers to adjusting the initial stiffness and variable stiffness characteristics of the rubber vibration isolator 1 under load by adjusting the hardness of the rubber body 11 and the number of metal partitions 12. Adjusting the height of the rubber vibration isolator 1 refers to adjusting the vertical distance between the inner and outer metal sleeves of the rubber vibration isolator in its unloaded free state. By adjusting the initial stiffness and variable stiffness characteristics of the rubber vibration isolator 1 under load, the height change of the rubber vibration isolator 1 during the loading process of the carriage floor can be adjusted. By adjusting the vertical distance between the inner and outer metal sleeves when unloaded, the initial height of the carriage floor when unloaded can be adjusted, thereby determining the standard height of the carriage floor under normal load.

[0043] The phrase "connecting the electric worm gear to the vehicle's floor height detection system signal control" refers to the use of a servo motor with a servo driver on the motor 6 of the housing 2. The servo driver is connected to the floor height detection system signal control system, receiving signals from the system and controlling the motor's operation. Based on the received signals, the servo driver controls the motor's forward, reverse, or stop rotation. The floor height detection system sends a lift or lower signal to the servo driver. When the servo driver receives a lift signal, it controls the servo motor to extend the telescopic component 4 upwards until the vehicle floor is raised to the standard height. When the servo driver receives a lower signal, it controls the servo motor to retract the telescopic component downwards until the vehicle floor is raised to the standard height, thus achieving automatic adjustment of the vehicle floor height.

[0044] The technical solutions of the embodiments of the present invention have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. 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.

Claims

1. A secondary suspension system for a rail vehicle, connecting the bogie and the car floor, comprising a height adjustment mechanism fixedly connected to the bogie and rubber vibration isolators fixedly connected to the car floor, characterized in that: The height adjustment mechanism includes a housing fixed to the bogie and filled with grease or lubricating oil, an electric worm gear installed in the housing, and a telescopic component installed vertically in the housing with a self-locking function. The telescopic component is connected to the electric worm gear and extends out of the housing and is fixed to the rubber vibration isolator. It extends and retracts with the transmission of the electric worm gear and drives the rubber vibration isolator to rise and fall. An elastic body is connected between the housing and the rubber vibration isolator, and the elastic body deforms elastically as the rubber vibration isolator rises and falls. The electric worm gear includes a worm connected to a motor on the housing, a worm wheel meshing with the worm, and a telescopic component including a rotatable sleeve installed in the housing and a screw rod installed in the sleeve. The worm wheel is keyed and fitted onto the sleeve, and the upper end of the screw rod extends out of the housing and is fixedly connected to the rubber vibration isolator. The rubber vibration isolator includes a conical metal outer sleeve, a conical metal inner sleeve located inside the inner cavity of the metal outer sleeve, and a rubber body that vulcanizes and connects the metal outer sleeve and the metal inner sleeve. A through hole is opened on the metal inner sleeve along the central axis, and the upper end of the screw passes through the through hole and is fixedly connected to the metal inner sleeve. At least one layer of conical metal partition is vulcanized in the rubber body. The top of the metal outer sleeve is fixedly connected to the floor of the carriage, and a vertical gap is formed between the metal inner sleeve and the metal outer sleeve.

2. The secondary suspension system for rail vehicles according to claim 1, characterized in that: Tapered roller bearings are press-fitted to both ends of the threaded sleeve. The tapered roller bearings are assembled in the housing and axially positioned by a positioning nut fastened to the threaded sleeve. The positioning nut and the housing are sealed with a sealing ring.

3. The secondary suspension system for rail vehicles according to claim 1, characterized in that: The elastic body is a rubber sealing ring connected between the metal inner sleeve and the housing. The upper end face of the elastic body is bonded to the metal inner sleeve, and the lower end face is bonded to the housing. The elastic body is sleeved outside the screw and its inner diameter is larger than the outer diameter of the screw.

4. A method for adjusting the height of the car floor, employing the secondary suspension system for rail vehicles as described in any one of claims 1 to 3, characterized in that: The standard height of the car floor under normal load conditions is determined by adjusting the number of secondary suspension systems of the rail vehicle between the bogie and the car floor, the stiffness and height of the rubber vibration isolators, based on the load-bearing capacity of a single car and the operating conditions of the vehicle's running line. The electric worm gear is connected to the vehicle's floor height detection system. When the vehicle floor sinks below a predetermined standard height, the floor height detection system sends a lifting signal to the electric worm gear. The electric worm gear then extends the telescopic component until the vehicle floor is raised to the standard height. When the vehicle floor rises above the predetermined standard height, the floor height detection system sends a lowering signal to the electric worm gear. The electric worm gear then retracts the telescopic component until the vehicle floor descends to the standard height.

5. The method for adjusting the height of the carriage floor according to claim 4, characterized in that: Adjusting the stiffness of a rubber vibration isolator refers to adjusting the initial stiffness and variable stiffness characteristics of the rubber vibration isolator under load by adjusting the hardness of the rubber body and the number of metal partitions. Adjusting the height of the rubber vibration isolator refers to adjusting the vertical distance between the inner and outer metal sleeves of the rubber vibration isolator in the unloaded free state.

6. The method for adjusting the height of the carriage floor according to claim 5, characterized in that: "Connecting the electric worm gear to the vehicle's floor height detection system signal control" means that the motor on the housing is a servo motor with a servo driver, the servo driver is connected to the floor height detection system signal, and the servo driver receives the signal sent by the floor height detection system and controls the operation of the servo motor.

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