Passenger door with restraint bar mechanism

Abstract

The present application relates to the technical field of passenger car door, and disclose a passenger car passenger door with restraint rod mechanism, including: the car door main part and the car door limiting mechanism, the car door main part is arranged at the door frame of passenger car compartment body, the car door limiting mechanism is arranged below the passenger car vehicle, both ends of the car door limiting mechanism are respectively with the passenger car compartment body and the car door main part each other rotates, the car door limiting mechanism is used to constrain the rotation stroke of the car door main part;The present application is through setting up three sets of independent limiting mechanism damage components, matches the step ladder hidden type maintenance window, solves the core safety hidden trouble of passenger car impact after the deformation of the restraint rod locks the door, the failure of electric control door opening, the personnel in the car cannot escape, the practicability of emergency self-help is extremely strong.When the vehicle is impacted to cause the connecting rod to bend and lock the door, the personnel in the car can open the maintenance door through the step ladder bottom maintenance window, directly touch the restraint rod to break the lock operation.

Description

Technical Field

[0001] This invention relates to the field of bus door technology, specifically to a bus passenger door with a constraint rod mechanism. Background Technology

[0002] Passenger doors are a crucial component of buses, directly impacting operational efficiency, passenger safety, and the overall sealing and sound insulation performance. Currently, common types of bus passenger doors include outward-swinging passenger doors, folding passenger doors, and sliding doors. Among these, outward-swinging passenger doors are widely used in tourist buses, city buses, and group buses due to their small footprint when opened, good sealing, and relatively simple structure. Existing outward-swinging passenger doors are typically connected to the door frame posts via hinges or swing arm mechanisms, and their opening and closing are achieved using pneumatic or electric rotary drive mechanisms. During opening, the door body undergoes a compound motion around the swing arm axis (first translating outwards and then swinging). To ensure that the door body can stably maintain a certain position after opening (such as the maximum opening position), and to prevent the door body from accidentally swinging back or swaying due to vehicle vibration, slope, or wind, a restraint bar is installed to connect the outward-swinging passenger door to the vehicle.

[0003] However, existing restraint bars typically function as rigid limiting components, acting as mechanical brakes when the doors are fully open. But when a vehicle is struck from the side, the restraint bars are highly susceptible to bending and deformation. Once bent, the effective length of the restraint bar changes, preventing the restraint mechanism from properly disengaging or resetting, thus preventing the passenger doors from opening. In emergency situations such as traffic accidents, this door opening failure due to restraint bar deformation severely hinders the rapid evacuation of passengers, posing a significant safety hazard. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a passenger door for buses with a constraint rod mechanism. The main purpose is to solve the problem that when a vehicle is impacted from the side, if the constraint rod bends, its effective length will change, causing the constraint mechanism to fail to disengage or reset properly, thus preventing the passenger door from opening.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A passenger door for a bus with a constraint bar mechanism includes: The vehicle door body and the vehicle door limiting mechanism are provided. The vehicle door body is located at the door frame of the passenger compartment, and the vehicle door limiting mechanism is located below the passenger vehicle. The two ends of the vehicle door limiting mechanism rotate relative to the passenger compartment and the vehicle door body, respectively. The vehicle door limiting mechanism is used to constrain the rotation stroke of the vehicle door body. A limiting mechanism breaking component is disposed on the surface of the door limiting mechanism and is used to break the constraint of the door limiting mechanism on the door body; The bus staircase is located on the side of the main door facing the interior of the passenger compartment, and the end of the door limiting mechanism connected to the bottom surface of the bus is located below the bus staircase. The limit mechanism maintenance window is located below the bus stairs, and the limit mechanism maintenance window is located at the bottom of the bus stairs; A door drive mechanism is installed inside the vehicle compartment and is connected to the door.

[0006] As a further embodiment of the present invention, the door limiting mechanism includes: A connecting rod is provided below the door body and the bus stairs, with both ends of the connecting rod facing the door body and the bus stairs respectively; A screw is inserted inside the connecting rod, and the screw is threadedly connected to the connecting rod, with the screw facing the door body; A connecting cylinder and a ball socket are provided, wherein the connecting cylinder is installed at the end of the connecting rod facing the bus staircase, and the ball socket is installed at the end of the screw away from the connecting rod, and the ball socket is rotatably connected to the screw. The positioning plate and the ball head bolt are bolted to the bottom surface of the bus stairs. The positioning plate is rotatably connected to the connecting cylinder through the ball head. The ball head bolt is bolted to the bottom end of the door body and is rotatably connected to the ball socket through the ball head.

[0007] As a further embodiment of the present invention, the limiting mechanism destruction component includes: Several cutting grooves are symmetrically opened on the surface of the connecting rod along the axis, and the cutting grooves are semi-circular. The cutting grooves are grouped in pairs, and the distance between the two cutting grooves above the connecting rod is narrower than the distance between the two cutting grooves below. Several slits, each slit having an arc-shaped groove at its bottom, which is inserted into the slit groove located above the connecting rod; A force-applying plate is disposed above the cut-off pieces, and the force-applying plate is integrally formed with several cut-off pieces, and a gap is provided between the force-applying plate and the connecting rod.

[0008] As a further embodiment of the present invention, a protective sleeve is provided on the surface of the connecting rod, the protective sleeve is slidably connected to the connecting rod, a sliding groove is provided on the surface of the protective sleeve, a sliding column is slidably connected inside the sliding groove, and the sliding column is fixedly connected to the force-applying plate.

[0009] As a further embodiment of the present invention, the limiting mechanism destruction component includes: A movable hole is formed inside the connecting cylinder, and the movable hole is coaxial with the connecting cylinder; A hemispherical plate is disposed inside the movable hole. The hemispherical plate is slidably connected to the connecting cylinder through the movable hole, and the hemispherical plate wraps around the ball head surface of the positioning plate. A linkage rod is disposed inside the connecting rod, the connecting rod passing through the surface of the connecting cylinder and integrally formed with the hemispherical plate; The force application handle is rotatably connected to the surface of the connecting rod via a positioning shaft; A connecting plate is disposed inside the connecting rod, and both ends of the connecting plate are respectively connected to the positioning shaft of the force application handle; Force-applying grooves are formed on the surface of the connecting plate; Two limiting blocks are symmetrically fixedly connected to the surface of the connecting rod, and the top surface of the limiting blocks abuts against the force application handle.

[0010] As a further embodiment of the present invention, the limiting mechanism destruction component includes: The bottom inclined groove and the bottom cutting plate are provided. The bottom inclined groove is formed on the bottom surface of the connecting rod and is inclined. The bottom cutting plate is on the same vertical axis as the bottom inclined groove and is connected to the maintenance window of the limiting mechanism.

[0011] As a further embodiment of the present invention, the top surface of the connecting rod is provided with a top inclined groove, and the bottom surface of the bus step is fixedly connected with a top cutting plate, the tip of the top cutting plate facing the top inclined groove, and the top cutting plate is arranged perpendicular to the connecting rod in the horizontal direction. A top abutment block is fixedly connected to the bottom surface of the bus staircase. The top abutment block is arranged parallel to the top cutting plate, and the bottom surface of the top abutment block is higher than the tip of the top cutting plate.

[0012] As a further embodiment of the present invention, a clearance groove is provided on the side of the ball socket away from the connecting rod, and the clearance groove is wider than the bolt diameter of the ball head bolt.

[0013] As a further embodiment of the present invention, the maintenance window of the limiting mechanism includes: A maintenance slot is provided at the lowest level of the bus staircase, and the maintenance slot extends through the bus staircase. A maintenance door is provided inside the maintenance slot, and the maintenance door is rotatably connected to the surface of the bus stairs via hinges; A handle is rotatably connected to the top surface of the maintenance door via a pivot; and a transparent glass cover is provided on the top surface of the maintenance door at the position corresponding to the handle.

[0014] As a further embodiment of the present invention, the door drive mechanism includes: The geared motor is bolted to the inside of the passenger car body. The connecting shaft is connected to the output shaft of the geared motor via a coupling. Several force-applying rods, wherein the force-applying rods are integrally formed with the connecting shaft; Several connecting brackets are bolted to the side of the door body facing the passenger compartment; The force-applying rod corresponds to the connecting angle bracket, and the force-applying rod and the connecting angle bracket are connected to each other by a ball joint for rotation.

[0015] Compared with the prior art, the present invention provides a passenger door for a bus with a constraint rod mechanism, which has the following advantages: 1. This invention, by setting up three independent limiting mechanism breaking components, combined with a hidden maintenance window on the staircase, solves the core safety hazards of bus collisions, such as deformation of the restraint rod locking the door, failure of the electronic door opening, and inability of passengers to escape. It is highly practical for emergency self-rescue. When a vehicle is impacted and the connecting rod bends, locking the door, passengers can quickly open the maintenance door through the maintenance window on the bottom floor of the staircase and directly touch the restraint rod to break the lock.

[0016] 2. To address the varying strength levels of different individuals, the device offers diverse lock-breaking methods: pressing the cutting groove and its accompanying force-applying plate concentrates stress to quickly sever the connecting rod; prying or kicking the force-applying handle breaks the low-carbon steel connecting plate, releasing the ball head limit for rapid unlocking; and flipping the maintenance door utilizes the bidirectional shearing force of the symmetrical top and bottom cutting plates, combined with the top stop block's anti-deformation structure, to efficiently break the connecting rod. These multi-mode lock-breaking methods are suitable for individuals of varying strength, including the elderly, children, and women. The operation is simple, the threshold for exerting force is low, and the lock-breaking speed is fast, eliminating the need to dismantle the main body of the car door or windows, significantly improving escape efficiency in accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the closing of a passenger door of a bus with a constraint rod mechanism proposed in this invention; Figure 2 This is a schematic diagram illustrating the opening of a passenger door for a bus with a constraint rod mechanism, as proposed in this invention. Figure 3 This is a schematic diagram of the closing of a maintenance door for a passenger door on a bus with a constraint rod mechanism, as proposed in this invention. Figure 4 This is a schematic diagram of the opening of a maintenance door for a passenger door on a bus with a constraint rod mechanism, as proposed in this invention. Figure 5This is a schematic diagram of a maintenance door and handle for a passenger door of a bus with a constraint rod mechanism, as proposed in this invention. Figure 6 This is a schematic diagram of the closed state of the passenger door body and the connecting rod of a bus passenger door with a constraint rod mechanism proposed in this invention; Figure 7 This is a schematic diagram of the main body of a passenger door with a constraint rod mechanism in a bus, showing its open state and the connecting rod structure, as proposed in this invention. Figure 8 This is a schematic diagram of the bus stairs and maintenance bay structure of a bus passenger door with a constraint rod mechanism proposed in this invention. Figure 9 This is a schematic diagram of the main body and force-applying rod structure of a passenger door with a constraint rod mechanism for a bus, as proposed in this invention. Figure 10 This is a schematic diagram of the passenger door staircase and top cut plate structure of a passenger bus with a constraint rod mechanism proposed in this invention.

[0018] Figure 11 This is a schematic diagram of the main body of a passenger door with a constraint rod mechanism and the structure of a passenger staircase in a bus, as proposed in this invention.

[0019] Figure 12 This is a vertical cross-sectional view of the protective sleeve structure of a passenger door of a bus with a constraint rod mechanism proposed in this invention.

[0020] Figure 13 This is a schematic diagram of the cut-off piece and force-applying plate structure of a passenger door with a constraint rod mechanism proposed in this invention.

[0021] Figure 14 This is a schematic diagram of the hemispherical plate and linkage rod structure of a passenger door with a constraint rod mechanism proposed in this invention.

[0022] Figure 15 This is a schematic diagram of the connecting plate and force-applying groove structure of a passenger door with a constraint rod mechanism proposed in this invention.

[0023] Figure 16 This is a schematic diagram of the top stop block and top cutting plate structure of a passenger door of a bus with a constraint rod mechanism proposed in this invention.

[0024] Figure 17 This is a schematic diagram of the bottom and top inclined groove structures of a passenger door with a constraint rod mechanism proposed in this invention.

[0025] In the diagram: 1. Bus body; 2. Door body; 3. Bus stairs; 4. Gear motor; 5. Force application rod; 6. Connecting angle bracket; 7. Connecting shaft; 8. Maintenance door; 9. Handle; 10. Maintenance slot; 11. Positioning plate; 12. Ball socket; 13. Top stop block; 14. Screw; 15. Connecting cylinder; 16. Connecting rod; 17. Cut-off slot; 18. Cut-off piece; 19. Force application plate; 20. Protective sleeve; 21. Slide groove; 22. Slide column; 23. Ball head bolt; 24. Alternating groove; 25. Moving hole; 26. Hemispherical plate; 27. Linkage rod; 28. Force application handle; 29. ​​Limiting block; 30. Connecting plate; 31. Force application slot; 32. Bottom inclined slot; 33. Top inclined slot; 34. Bottom cutting plate; 35. Top cutting plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Please see Figures 1-17As shown, a passenger door of a bus with a constraint bar mechanism includes a door body 2 installed at the door frame of the bus body 1 and a door limiting mechanism (also known as a constraint bar) installed below the bus body 1. The bus body 1 is provided with a door driving mechanism for driving the door to open and close. The surface of the door limiting mechanism is provided with a limiting mechanism destruction component. The bus body 1 is provided with a bus staircase 3. The bottom of the bus staircase 3 is provided with a limiting mechanism maintenance window for facilitating the destruction of the door limiting mechanism. like Figures 6 to 11 As shown, the door limiting mechanism is located below the bus staircase 3, and the door limiting mechanism includes a connecting rod 16, a screw 14, a connecting cylinder 15, a ball socket 12, a positioning plate 11, and a ball head bolt 23; The connecting rod 16 is located below the door body 2 and the bus stair 3. When the door body 2 is closed, the connecting rod 16 is inclined, and the two ends of the connecting rod 16 face the door body 2 and the bus stair 3 respectively. A screw 14 is threaded to the end of the connecting rod 16 facing the door body 2. A ball socket 12 is rotatably connected to the end of the screw 14 away from the connecting rod 16 through a rotating shaft. A ball head bolt 23 is hinged inside the ball socket 12 and threaded to the bottom surface of the door body 2. A connecting cylinder 15 is integrally formed at the end of the connecting rod 16 away from the screw 14. The positioning plate 11 is installed on the bottom surface of the bus stair 3 by bolts. The positioning plate 11 is hinged to the connecting cylinder 15 through the ball head. Specifically, when it is necessary to install the door limiting mechanism, first determine the position of the positioning plate 11, install the positioning plate 11 on the bottom surface of the bus step 3 with bolts, so that one end of the connecting rod 16 can rotate with the positioning plate 11 as the axis, and then rotate the screw 14 inside the connecting rod 16 to adjust the position of the ball socket 12 and the positioning plate 11, so that the ball head bolt 23 corresponds to the mounting hole of the door body 2, so that the ball head bolt 23 can be connected to the door body 2 with bolts, and when the ball head bolt 23 is connected to the positioning plate 11, the connecting rod 16 will be located below the maintenance window of the limiting mechanism; After installation, when the door body 2 is opened or closed, the ball head bolt 23 will pull the screw 14 and the connecting rod 16, causing the connecting rod 16 to rotate around the hinge point of the positioning plate 11. When the door body 2 is opened, the connecting rod 16 will form a mechanical limit, restricting the door body 2 from moving when it is opened, thus preventing the door from shifting or shaking. At the same time, the overall length of the connecting rod 16 can be adjusted by rotating the screw 14 to accommodate different installation position errors and improve installation adaptability.

[0030] When the vehicle is subjected to an external impact that causes the connecting rod 16 to bend and deform, it becomes difficult to open the car door from the inside. If the occupants need to attempt self-rescue by breaking the connecting rod 16, they will be unable to do so. Passengers inside the vehicle can access the connecting rod 16 through the maintenance window of the limiting mechanism. The maintenance window of the limiting mechanism includes a maintenance slot 10 opened at the lowest level of the bus stair 3 and a maintenance door 8 that is rotatably connected to the surface of the bus stair 3 via a hinge. The maintenance door 8 is located inside the maintenance slot 10 and has a handle 9 rotatably connected to the top surface of the maintenance door 8 via a pivot. A transparent glass cover is provided on the top surface of the maintenance door 8 at the position corresponding to the handle 9. When it is necessary to access the connecting rod 16, first pull the transparent glass cover out from the handle 9, then pull up the handle 9. This will allow the maintenance door 8 to rotate and open along the hinge, revealing the maintenance slot 10 below. Passengers inside the vehicle can then directly access the connecting rod 16 through the maintenance slot 10. The deformed or bent connecting rod 16 can then be removed, releasing its locking mechanism on the door body 2. This allows for easy escape from inside the vehicle by opening the door body 2 without damaging other structures, significantly improving the efficiency of self-rescue. After the operation is complete, simply replace the connecting rod 16.

[0031] When the vehicle is subjected to an external impact that causes the connecting rod 16 to bend and deform, it is necessary to destructively remove the connecting rod 16. This can be achieved by using a limiting mechanism destruction component set on the surface of the connecting rod 16. like Figure 12 As shown, specifically, several cut-off grooves 17 are symmetrically opened on the surface of the connecting rod 16 along the axis, and the cut-off grooves 17 are semi-circular. The cut-off grooves 17 are grouped in pairs, and the distance between the two cut-off grooves 17 located above the connecting rod 16 is narrower than the distance between the two cut-off grooves 17 located below. The bottom of the cut-off piece 18 is provided with an arc-shaped groove. The arc-shaped groove of the cut-off piece 18 is located inside the two cut-off slots 17 above the connecting rod 16. A force-applying plate 19 is integrally formed above the cut-off piece 18. There is a gap between the force-applying plate 19 and the connecting rod 16. It should be noted that the two cut-off slots 17 below have inverted V-shaped notches inside, which facilitates subsequent destructive actions.

[0032] A protective sleeve 20 is slidably fitted on the surface of the connecting rod 16. A groove 21 is opened on the surface of the protective sleeve 20. A sliding column 22 is slidably connected inside the groove 21. The sliding column 22 is made of neodymium iron boron permanent magnet material. Ferritic stainless steel is embedded inside the groove 21 that magnetically attracts the sliding column 22, so as to achieve magnetic attraction and prevent the protective sleeve 20 from moving on its own.

[0033] The sliding column 22 is fixedly connected to the force-applying plate 19, and the force-applying plate 19 can be covered by the sliding protective sleeve 20; The process of damaging the connecting rod 16 is as follows: First, the protective sleeve 20 is slid on the surface of the connecting rod 16 in a direction that does not cover the force plate 19, thereby exposing the force plate 19. Then, force (such as kicking) is applied to press down on the force plate 19. The force plate 19 drives the cutting piece 18 to apply force to the cutting groove 17 at the corresponding position of the connecting rod 16 along the direction of the arc groove. Subsequently, the two cutting grooves 17 located below will tear along the V-shaped opening until the connecting rod 16 breaks from the two cutting grooves 17 below, thereby achieving the damage to the connecting rod 16. The protective sleeve 20 is usually covered on the surface of the force plate 19 to prevent the force plate 19 from being subjected to uncontrollable external forces. Furthermore, due to the shape of the upper cutting groove 17 limiting the orientation of the cutting piece 18, the force-applying plate 19 always faces upward.

[0034] The connecting rod 16 is very easy to break at the cut-off groove 17 when the vehicle is hit, which speeds up the escape speed; like Figure 14 As shown, to prevent women, the elderly, and children, who have less strength, from easily damaging the connecting rod 16, the limiting mechanism includes a moving hole 25 inside the connecting cylinder 15. A hemispherical plate 26 slides along the axial direction of the connecting cylinder 15 inside the moving hole 25. The inner wall of the hemispherical plate 26 is in contact with the ball head of the positioning plate 11, and the ball head of the positioning plate 11 is limited by the hemispherical plate 26. A linkage rod 27 is integrally formed on the outer wall of the hemispherical plate 26. The end of the linkage rod 27 away from the hemispherical plate 26 is inserted into the connecting rod 16. A force application handle 28 is rotatably connected to the surface of the connecting rod 16 through a positioning shaft. A connecting plate 30 is provided inside the connecting rod 16. The connecting plate 30 is made of low carbon steel and is fixed to the end of the linkage rod 27 away from the hemispherical plate 26. Both ends of the connecting plate 30 are respectively connected to the positioning shaft of the force application handle 28. Force application grooves 31 are provided on both sides of the connecting plate 30. Two limiting blocks 29 are symmetrically fixedly connected to the surface of the connecting rod 16. The two limiting blocks 29 are used to support the force application handle 28, so that the free end of the force application handle 28 always maintains a certain distance from the connecting rod 16. When in use, you need to hold the force application handle 28 and turn the force application handle 28 away from the limit block 29. The force application handle 28 will rotate around the positioning shaft, causing the connecting plate 30 to rotate. Because the linkage rod 27 is connected to the connecting plate 30, the connecting plate 30 will break at the weakest part of the force application groove 31. During the daily use of the door limit mechanism, the hemispherical plate 26 is only subjected to the downward force of the connecting rod 16, which is only the weight of a metal rod. Therefore, it can be broken by applying a force of more than 50N to the connecting plate 30. After the connecting plate 30 is broken, apply downward pressure to the connecting rod 16 to dislodge the ball head of the positioning plate 11 from the inside of the hemispherical plate 26.

[0035] If you cannot break the connecting plate 30 by holding the force application handle 28, you can kick the force application handle 28 away from the limit block 29.

[0036] like Figure 17 As shown, when the door body 2 needs to be opened quickly, the limiting mechanism breaking component includes a bottom inclined groove 32 opened on the bottom surface of the connecting rod 16 and a bottom cutting plate 34 set below the connecting rod 16. The bottom cutting plate 34 and the bottom inclined groove 32 are on the same vertical axis, and the bottom cutting plate 34 is fixedly connected to the bottom surface of the maintenance door 8. When the maintenance door 8 is flipped upward, the bottom cutting plate 34 will be inserted into the bottom inclined groove 32, thereby cutting off the connecting rod 16 through the bottom inclined groove 32; A top inclined groove 33 is provided on the top surface of the connecting rod 16, and a top cutting plate 35 is fixedly connected to the bottom surface of the bus step 3. The tip of the top cutting plate 35 faces the top inclined groove 33, and the top cutting plate 35 is set perpendicular to the horizontal direction of the connecting rod 16. When the bottom cutting plate 34 cuts into the bottom inclined groove 32, the top cutting plate 35 is simultaneously inserted into the top inclined groove 33. The top cutting plate 35 and the bottom cutting plate 34 will exert force from above and below at the same time, making the connecting rod 16 more likely to break. A top abutment block 13 is fixedly connected to the bottom surface of the bus staircase 3. The top abutment block 13 is set parallel to the top cutting plate 35, and the bottom surface of the top abutment block 13 is higher than the tip of the top cutting plate 35. If the connecting rod 16 does not break directly when the bottom cutting plate 34 is applied, but deforms due to the impact, the top block 13 will limit the connecting rod 16 to prevent the connecting rod 16 from deforming too severely and causing the bottom cutting plate 34 to be unable to apply force to the bottom inclined groove 32. The connecting rod 16 is highly likely to break at the bottom inclined groove 32 and the top inclined groove 33 during a vehicle collision, thus accelerating the escape speed. A clearance groove 24 is provided on the side of the ball socket 12 away from the connecting rod 16, and the clearance groove 24 is wider than the bolt diameter of the ball head bolt 23; When the connecting rod 16 is broken, the ball socket 12 will rotate on the surface of the ball head bolt 23 due to the weight of the screw 14.

[0037] When opening the main body 2 of the door, a door drive mechanism is required. The door drive mechanism includes a geared motor 4 that is bolted to the inside of the passenger compartment 1. The output shaft of the geared motor 4 is connected to a connecting shaft 7 via a coupling. Two force-applying rods 5 are integrally formed on the surface of the connecting shaft 7. Two connecting angle brackets 6 are bolted to the side of the main body 2 facing the passenger compartment, and the two connecting angle brackets 6 correspond to the two force-applying rods 5. The force-applying rods 5 are connected to the connecting angle brackets 6 via ball heads. Specifically, when it is necessary to open the main body of the car door 2 The geared motor 4 drives the two force rods 5 to rotate synchronously through the connecting shaft 7. The force rods 5 push the corresponding connecting brackets 6, causing the door body 2 to flip open to the outside of the carriage.

[0038] The working principle of this invention is as follows: The geared motor 4 inside the passenger compartment 1 serves as the power source for opening and closing. After being powered on, it drives the connecting shaft 7 to rotate via a coupling. Two synchronous force-applying rods 5 integrally formed on the connecting shaft 7 are hinged to the connecting angle bracket 6 inside the door body 2 through a ball joint structure. The geared motor 4 can swing the force-applying rods 5 by rotating in both directions, pushing the connecting angle bracket 6 outward to open the door body 2. Retracting the force-applying rods 5 in the opposite direction can pull the door back to complete the closing.

[0039] In the closed state: the connecting rod 16 below the main body of the door 2 is arranged at an overall angle to form a stable oblique support constraint; When the door is opened or closed: the displacement of the door pulls the ball head bolt 23, and the traction screw 14 and the connecting rod 16 rotate slightly around the ball head fulcrum of the positioning plate 11. The connecting rod 16 provides full mechanical rigidity to the door body 2, counteracting lateral displacement and vertical swaying during door opening and driving, ensuring stable opening and closing trajectory of the passenger door without looseness or vibration.

[0040] During assembly, rotating the screw 14 changes the overall effective length of the connecting rod 16 assembly; combined with the universal compensation capability of the ball joints of the double ball joint positioning plates 11 and the ball joint bolts 23, it can offset the processing and assembly dimensional errors of the frame, steps, and door sheet metal, adapt to the installation tolerances of different models, and has high assembly fault tolerance.

[0041] After the vehicle is subjected to external impact and compression, the connecting rod 16 bends and deforms, rigidly locking the door body 2. The electronically controlled drive mechanism inside the vehicle cannot open the door normally. The escape is achieved by relying on three sets of independent limit mechanism destruction components in conjunction with the ladder maintenance window: The lowest level of the bus staircase 3 has a maintenance slot 10 with a hinged maintenance door 8. The top of the maintenance door 8 has a handle 9 with a transparent glass cover for protection. The glass cover isolates dust and prevents accidental contact. In case of escape, the glass cover is removed first, and the handle 9 is pulled to open the maintenance door 8. The maintenance slot 10 leads directly to the connecting rod 16 below, and a person can directly reach into the slot to touch the restraint rod, providing space for manual operation.

[0042] The connecting rod 16 has multiple semi-annular cut-off grooves 17 evenly distributed along its axis. Cut-off pieces 18 with arc-shaped bottom grooves are pre-installed in the grooves. The cut-off pieces 18 extend upwards to form an integrated force-applying plate 19. A protective sleeve 20 is slidably fitted on the outside of the connecting rod 16. The sliding column 22 and the force-applying plate 19 are fixedly connected in the sliding groove 21 of the protective sleeve 20.

[0043] Normal state: The protective cover 20 slides to cover the force plate 19 to prevent vehicle vibration, gravel scraping and accidental pressure from triggering breakage; the cutting groove 17 pre-weakens the strength of the rod, and the rod can break off automatically in the groove under impact. Push the protective cover 20 to expose the force plate 19, press the force plate 19 vertically downward, and the cutting piece 18 will use the arc groove to directionally squeeze the groove wall of the connecting rod 16, concentrate the stress and quickly cut the connecting rod 16; after the rod breaks, the constraint disappears, the door has no mechanical lock, and can be pushed open directly inward or outward to escape, and can be repaired and reused by simply replacing the new connecting rod 16.

[0044] The ball socket 12 has a recess 24 on its side that is wider than the ball head bolt 23. After the rod is cut off, the screw 14 and the ball socket 12 can swing freely on the ball head bolt 23 by their own weight without jamming or interference.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A passenger door for a bus with a constraint rod mechanism, characterized in that, include: The door body (2) and the door limiting mechanism are provided. The door body (2) is located at the door frame of the passenger car body (1). The door limiting mechanism is located below the passenger car. The two ends of the door limiting mechanism rotate relative to the passenger car body (1) and the door body (2) respectively. The door limiting mechanism is used to constrain the rotation stroke of the door body (2). A limiting mechanism breaking component is disposed on the surface of the door limiting mechanism to break the constraint of the door limiting mechanism on the door body (2); Bus staircase (3), the bus staircase (3) is located on the side of the door body (2) facing the interior of the carriage, and the end of the door limiting mechanism connected to the bottom surface of the bus is located below the bus staircase (3); The limit mechanism maintenance window is located below the bus staircase (3) and is located at the bottom of the bus staircase (3). A door drive mechanism is installed inside the vehicle compartment and is connected to the door. The door limiting mechanism includes: A connecting rod (16) is provided below the door body (2) and the bus staircase (3), and the two ends of the connecting rod (16) are respectively facing the door body (2) and the bus staircase (3). A screw (14) is inserted inside the connecting rod (16), and the screw (14) is threadedly connected to the connecting rod (16), with the screw (14) facing the door body (2). A connecting cylinder (15) and a ball socket (12) are provided. The connecting cylinder (15) is installed at the end of the connecting rod (16) facing the bus staircase (3), and the ball socket (12) is installed at the end of the screw (14) away from the connecting rod (16). The ball socket (12) is rotatably connected to the screw (14). The positioning plate (11) and the ball head bolt (23) are bolted to the bottom surface of the bus step (3). The positioning plate (11) is rotatably connected to the connecting cylinder (15) through the ball head. The ball head bolt (23) is bolted to the bottom end of the door body (2). The ball head bolt (23) is rotatably connected to the ball socket (12) through the ball head. The limiting mechanism destruction component includes: Several cut-off grooves (17) are symmetrically opened on the surface of the connecting rod (16) along the axis, and the cut-off grooves (17) are semi-circular. The cut-off grooves (17) are in pairs, and the distance between the two cut-off grooves (17) above the connecting rod (16) is narrower than the distance between the two cut-off grooves (17) below. Several slits (18), the bottom of the slits (18) is provided with an arc-shaped groove and inserted into the slit groove (17) located above the connecting rod (16); A force-applying plate (19) is disposed above the cut-off piece (18), and the force-applying plate (19) is integrally formed with a plurality of cut-off pieces (18), and a gap is provided between the force-applying plate (19) and the connecting rod (16).

2. A passenger door for a bus with a constraint rod mechanism according to claim 1, characterized in that, The surface of the connecting rod (16) is covered with a protective sleeve (20), the protective sleeve (20) is slidably connected to the connecting rod (16), the surface of the protective sleeve (20) is provided with a sliding groove (21), the sliding groove (21) is slidably connected with a sliding column (22), and the sliding column (22) is fixedly connected to the force plate (19).

3. A passenger door for a bus with a constraint rod mechanism according to claim 1, characterized in that, The ball socket (12) has a clearance groove (24) on the side away from the connecting rod (16), and the clearance groove (24) is wider than the bolt diameter of the ball head bolt (23); The limit mechanism maintenance window includes: A maintenance slot (10) is provided on the lowest level of the bus staircase (3), and the maintenance slot (10) extends through the bus staircase (3). A maintenance door (8) is provided inside the maintenance slot (10), and the maintenance door (8) is rotatably connected to the surface of the bus staircase (3) by a hinge; A handle (9) is rotatably connected to the top surface of the maintenance door (8) via a pivot; and a transparent glass cover is provided on the top surface of the maintenance door (8) at the position corresponding to the handle (9); The door drive mechanism includes: The geared motor (4) is bolted to the inside of the passenger car body (1); The connecting shaft (7) is connected to the output shaft of the geared motor (4) via a coupling; Several force-applying rods (5) are integrally formed with the connecting shaft (7); Several connecting brackets (6) are bolted to the side of the door body (2) facing the carriage; The force-applying rod (5) corresponds to the connecting angle bracket (6), and the force-applying rod (5) and the connecting angle bracket (6) are connected to each other by rotating ball joints.

4. A passenger door for a bus with a constraint rod mechanism, characterized in that, include: The door body (2) and the door limiting mechanism are provided. The door body (2) is located at the door frame of the passenger car body (1). The door limiting mechanism is located below the passenger car. The two ends of the door limiting mechanism rotate relative to the passenger car body (1) and the door body (2) respectively. The door limiting mechanism is used to constrain the rotation stroke of the door body (2). A limiting mechanism breaking component is disposed on the surface of the door limiting mechanism to break the constraint of the door limiting mechanism on the door body (2); Bus staircase (3), the bus staircase (3) is located on the side of the door body (2) facing the interior of the carriage, and the end of the door limiting mechanism connected to the bottom surface of the bus is located below the bus staircase (3); The limit mechanism maintenance window is located below the bus staircase (3) and is located at the bottom of the bus staircase (3). A door drive mechanism is installed inside the vehicle compartment and is connected to the door. The door limiting mechanism includes: A connecting rod (16) is provided below the door body (2) and the bus staircase (3), and the two ends of the connecting rod (16) are respectively facing the door body (2) and the bus staircase (3). A screw (14) is inserted inside the connecting rod (16), and the screw (14) is threadedly connected to the connecting rod (16), with the screw (14) facing the door body (2). A connecting cylinder (15) and a ball socket (12) are provided. The connecting cylinder (15) is installed at the end of the connecting rod (16) facing the bus staircase (3), and the ball socket (12) is installed at the end of the screw (14) away from the connecting rod (16). The ball socket (12) is rotatably connected to the screw (14). The positioning plate (11) and the ball head bolt (23) are bolted to the bottom surface of the bus step (3). The positioning plate (11) is rotatably connected to the connecting cylinder (15) through the ball head. The ball head bolt (23) is bolted to the bottom end of the door body (2). The ball head bolt (23) is rotatably connected to the ball socket (12) through the ball head. The limiting mechanism destruction component includes: A movable hole (25) is formed inside the connecting cylinder (15), and the movable hole (25) is coaxial with the connecting cylinder (15); A hemispherical plate (26) is disposed inside the movable hole (25). The hemispherical plate (26) is slidably connected to the connecting cylinder (15) through the movable hole (25), and the hemispherical plate (26) wraps around the ball head surface of the positioning disk (11). Linkage rod (27) is disposed inside the connecting rod (16), the connecting rod (16) penetrates the surface of the connecting cylinder (15) and is integrally formed with the hemispherical plate (26); The force-applying handle (28) is rotatably connected to the surface of the connecting rod (16) via a positioning shaft; A connecting plate (30) is disposed inside the connecting rod (16), and both ends of the connecting plate (30) are respectively connected to the positioning shaft of the force application handle (28); A force-applying groove (31) is formed on the surface of the connecting plate (30); Two limiting blocks (29) are symmetrically fixedly connected to the surface of the connecting rod (16), and the top surface of the limiting block (29) abuts against the force application handle (28).

5. A passenger door for a bus with a constraint rod mechanism according to claim 4, characterized in that, The ball socket (12) has a clearance groove (24) on the side away from the connecting rod (16), and the clearance groove (24) is wider than the bolt diameter of the ball head bolt (23); The limit mechanism maintenance window includes: A maintenance slot (10) is provided on the lowest level of the bus staircase (3), and the maintenance slot (10) extends through the bus staircase (3). A maintenance door (8) is provided inside the maintenance slot (10), and the maintenance door (8) is rotatably connected to the surface of the bus staircase (3) by a hinge; A handle (9) is rotatably connected to the top surface of the maintenance door (8) via a pivot; and a transparent glass cover is provided on the top surface of the maintenance door (8) at the position corresponding to the handle (9); The door drive mechanism includes: The geared motor (4) is bolted to the inside of the passenger car body (1); The connecting shaft (7) is connected to the output shaft of the geared motor (4) via a coupling; Several force-applying rods (5) are integrally formed with the connecting shaft (7); Several connecting brackets (6) are bolted to the side of the door body (2) facing the carriage; The force-applying rod (5) corresponds to the connecting angle bracket (6), and the force-applying rod (5) and the connecting angle bracket (6) are connected to each other by rotating ball joints.

6. A passenger door for a bus with a constraint rod mechanism, characterized in that, include: The door body (2) and the door limiting mechanism are provided. The door body (2) is located at the door frame of the passenger car body (1). The door limiting mechanism is located below the passenger car. The two ends of the door limiting mechanism rotate relative to the passenger car body (1) and the door body (2) respectively. The door limiting mechanism is used to constrain the rotation stroke of the door body (2). A limiting mechanism breaking component is disposed on the surface of the door limiting mechanism to break the constraint of the door limiting mechanism on the door body (2); Bus staircase (3), the bus staircase (3) is located on the side of the door body (2) facing the interior of the carriage, and the end of the door limiting mechanism connected to the bottom surface of the bus is located below the bus staircase (3); The limit mechanism maintenance window is located below the bus staircase (3) and is located at the bottom of the bus staircase (3). A door drive mechanism is installed inside the vehicle compartment and is connected to the door. The door limiting mechanism includes: A connecting rod (16) is provided below the door body (2) and the bus staircase (3), and the two ends of the connecting rod (16) are respectively facing the door body (2) and the bus staircase (3). A screw (14) is inserted inside the connecting rod (16), and the screw (14) is threadedly connected to the connecting rod (16), with the screw (14) facing the door body (2). A connecting cylinder (15) and a ball socket (12) are provided. The connecting cylinder (15) is installed at the end of the connecting rod (16) facing the bus staircase (3), and the ball socket (12) is installed at the end of the screw (14) away from the connecting rod (16). The ball socket (12) is rotatably connected to the screw (14). The positioning plate (11) and the ball head bolt (23) are bolted to the bottom surface of the bus step (3). The positioning plate (11) is rotatably connected to the connecting cylinder (15) through the ball head. The ball head bolt (23) is bolted to the bottom end of the door body (2). The ball head bolt (23) is rotatably connected to the ball socket (12) through the ball head. The limiting mechanism destruction component includes: Bottom inclined groove (32) and bottom cutting plate (34), the bottom inclined groove (32) is opened on the bottom surface of the connecting rod (16), the bottom inclined groove (32) is opened at an angle, the bottom cutting plate (34) and the bottom inclined groove (32) are on the same vertical axis, and the bottom cutting plate (34) is connected to the maintenance window of the limiting mechanism.

7. A passenger door for a bus with a constraint rod mechanism according to claim 6, characterized in that, The top surface of the connecting rod (16) is provided with a top inclined groove (33), and the bottom surface of the bus step (3) is fixedly connected with a top cutting plate (35). The tip of the top cutting plate (35) faces the top inclined groove (33), and the top cutting plate (35) is set perpendicular to the connecting rod (16) in the horizontal direction. The bottom surface of the bus staircase (3) is fixedly connected to a top abutment block (13), which is parallel to the top cutting plate (35). The bottom surface of the top abutment block (13) is higher than the tip of the top cutting plate (35).

8. A passenger door for a bus with a constraint rod mechanism according to claim 6, characterized in that, The ball socket (12) has a clearance groove (24) on the side away from the connecting rod (16), and the clearance groove (24) is wider than the bolt diameter of the ball head bolt (23); The limit mechanism maintenance window includes: A maintenance slot (10) is provided on the lowest level of the bus staircase (3), and the maintenance slot (10) extends through the bus staircase (3). A maintenance door (8) is provided inside the maintenance slot (10), and the maintenance door (8) is rotatably connected to the surface of the bus staircase (3) by a hinge; A handle (9) is rotatably connected to the top surface of the maintenance door (8) via a pivot; and a transparent glass cover is provided on the top surface of the maintenance door (8) at the position corresponding to the handle (9); The door drive mechanism includes: The geared motor (4) is bolted to the inside of the passenger car body (1); The connecting shaft (7) is connected to the output shaft of the geared motor (4) via a coupling; Several force-applying rods (5) are integrally formed with the connecting shaft (7); Several connecting brackets (6) are bolted to the side of the door body (2) facing the carriage; The force-applying rod (5) corresponds to the connecting angle bracket (6), and the force-applying rod (5) and the connecting angle bracket (6) are connected to each other by rotating ball joints.

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