A matching integrated structure of a plug door for a bus
Patent Information
- Application Number
- CN202522350121.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-05
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-05
AI Technical Summary
[0002]在城市公共交通领域，6米低入口小公交因车身灵活、载客量适配短途线路、上下客便捷等优势，成为社区接驳、短途支线运输的核心车型，然而，受限于6米车身的紧凑空间布局，其塞拉门顶部区域既是内饰装饰关键部位，又是空调风道与塞拉门机构的集中安装区的结构设计长期面临以下技术瓶颈，严重影响车辆使用性能与驾乘体验；
通过将塞拉门顶上内饰、吸塑风道与空调送风结构一体化设计，各结构共享车顶内侧横梁这一安装基准，避免了独立结构的空间干涉问题；左侧风道的内凹弧面设计进一步优化了车内顶部空间轮廓，提高公交车内顶部空间利用率，有效缓解乘客站立时的压迫感，提升车内整体舒适性；
Smart Images
Figure CN224856686U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive interior and ventilation technology, and in particular to an integrated structure for sliding doors adapted to public transportation vehicles. Background Technology
[0002] In the field of urban public transportation, 6-meter low-entry minibuses have become the core vehicle for community shuttle and short-distance feeder transportation due to their advantages such as flexible body, passenger capacity suitable for short-distance routes, and convenient passenger boarding and alighting. However, due to the compact space layout of the 6-meter body, the structural design of the top area of its sliding door, which is both a key part of the interior decoration and a concentrated installation area for air conditioning ducts and sliding door mechanisms, has long faced the following technical bottlenecks, which seriously affect the vehicle's performance and driving experience. The interior structure, air conditioning ducts, and maintenance parts of the sliding door mechanism at the top of the door are all designed in a decentralized manner. Each part requires its own space and lacks a unified installation standard. The left and right air ducts often interfere with each other due to insufficient lateral spacing. The interior trim panels need to be cut to avoid the air ducts, which not only damages the integrity of the interior but also further compresses the headroom inside the vehicle. Passengers are prone to feeling a sense of oppression when standing, which contradicts the original design intention of the low-entry minibus to be convenient and comfortable. The passenger area and driver area have clear requirements for air conditioning air, but the traditional air conditioning air supply structure and air duct have poor compatibility. The airflow output by the air conditioning unit is only delivered through a single air duct and then distributed to each area through a simple air outlet. This results in excessive air volume in the driver area near the air duct, while insufficient air volume in the right rear seat area far from the air duct often occurs due to the long air supply path and large air loss. In the spool door mechanism, core components such as the door pump and crank arm are installed in the top area. In the traditional design, repairing the spool door mechanism requires first removing the interior trim panel and then disassembling some air duct sections. The operation steps are complicated and the repair is time-consuming. The air conditioning air supply structure is directly fixed to the interior panel rather than the roof beam. During vehicle operation, the interior panel is easily displaced due to vibration, which can cause the air supply structure to detach from the air duct, resulting in problems such as airflow leakage and abnormal noise from components. In summary, the existing structural design of the top area of the 6-meter low-entry plug door of small buses has problems such as low space utilization, uneven air supply, inconvenient maintenance, and poor stability. It can no longer meet the needs of modern urban short-distance buses for compact space, integrated functions, and convenient maintenance. There is an urgent need for a plug door matching integrated structure adapted to this model to overcome the above technical bottlenecks. Summary of the Invention
[0003] (I) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a sliding door integrated structure adapted for buses, comprising an upper air duct body and a lower door decoration, wherein the upper air duct body is fixed to the inner side crossbeam of the vehicle roof; a sliding door-compatible vacuum-formed air duct structure, comprising a left air duct and a right air duct, wherein the left air duct is fixed to the inner side crossbeam of the vehicle roof, and the right air duct is connected to the upper air duct body, and the lower door decoration is bolted to the right air duct, the left air duct and the right air duct running along the vehicle roof crossbeam. The air conditioning vents are symmetrically distributed; the air supply structure of the air conditioning vents is fixed on the crossbeam of the vehicle roof and is connected to the left and right air ducts respectively. The air supply structure of the air conditioning vents includes a left air inlet, a right small air inlet, a right large capacity air inlet and a duct. The left air inlet is connected to the chamber of the left air duct, the right large capacity air inlet is connected to the chamber of the left air duct through the duct, the right small air inlet is connected to the right air duct, a left air outlet is opened on the left air duct, and a right air outlet is opened on the right air duct.
[0004] Preferably, both the left and right air ducts have pre-set threaded holes with metal inserts at their top. The left air duct is fastened to the pre-set mounting holes of the inner side beam of the roof by bolts passing through the threaded holes. The right air duct is fastened to the upper air duct body by bolts and is set to fit the top mechanism of the sliding door. The gap between its inner wall and the sliding door mechanism is 5-10mm.
[0005] Preferably, the upper air duct body covers the top and outer side of the right air duct, and its inner wall is attached to the outer surface of the right air duct. The upper air duct body is provided with two inspection doors, which are movably connected by bolts and correspond to the inspection points of the sliding door mechanism.
[0006] Preferably, the lower decoration of the door is arranged along the inner edge of the top of the sliding door, and its upper edge is connected to the outer surface of the lower part of the right air duct. The upper part of the lower decoration of the door is fastened to the lower part of the right air duct by bolts. The lower part of the lower decoration of the door extends to the upper part of the sliding door frame, and the inner wall is attached to the lower part of the right air duct. A sponge sealing strip is provided at the attachment point.
[0007] Preferably, the right-side air vent is located at the lower part of the right-side air duct, corresponding to the right rear seat area of the vehicle. The small right-side air inlet is connected to the right-side air duct through a first air duct. The air duct has flange structures at both ends, one end of which is fastened to the large-capacity right-side air inlet, and the other end is fastened to the left-side air duct. The left-side air vent is located at the side and lower part of the left-side air duct, corresponding to the passenger area and the driver area respectively. The left-side air inlet is connected to the left-side air duct chamber through a second air duct.
[0008] Preferably, the lower part of the door decoration is made of flax composite substrate, and the flatness error between the outer surface of the lower part of the door decoration and the outer surface of the right air duct and the outer surface of the sliding door frame is less than 0.8mm.
[0009] Preferably, both the left and right air ducts are integrally molded by vacuum forming. The left air duct has a concave arc structure on the side facing the vehicle interior. A recessed platform for mounting a horn is provided on the arc surface of the left air duct. The horn is fixed in the recessed platform by bolts, and the outer wall of the horn is attached to the inner wall of the recessed platform.
[0010] Preferably, the air duct is made of flexible PVC material.
[0011] (ii) Beneficial effects By integrating the interior trim on the top of the sliding door, the vacuum-formed air duct, and the air conditioning supply structure into a single design, all structures share the same installation reference as the inner side crossbeam of the roof, thus avoiding spatial interference issues between independent structures. The concave arc design of the left-side air duct further optimizes the contour of the roof space inside the vehicle, improves the utilization rate of the roof space inside the bus, effectively alleviates the feeling of oppression when passengers are standing, and enhances the overall comfort inside the vehicle. The inspection door of the main air duct body directly corresponds to the inspection point of the sliding door mechanism. The maintenance of the sliding door mechanism can be completed by opening the inspection door without disassembling the interior or air duct components, which shortens the maintenance time and significantly reduces the vehicle maintenance cost. The air conditioning vent structure uses air ducts to distribute airflow between the left and right ducts. Combined with the precise air delivery paths of the first and second air ducts, it ensures balanced airflow in the passenger area, driver area, and right rear seat area, significantly improving the comfort experience for passengers. The left and right air ducts are made using a vacuum forming process, resulting in high structural strength and light weight; the lower part of the door is decorated with a linoleum composite substrate, which is both decorative and wear-resistant. Attached Figure Description
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of the relationship between the interior structure on top of the sliding door and the sliding door-compatible vacuum-formed air duct structure of this application; Figure 3 This is a schematic diagram of the interior structure on top of the sliding door in this application; Figure 4 This is a schematic diagram of the interior structure on the top of the sliding door, the sliding door-adaptive vacuum-formed air duct structure, and the air conditioning outlet air supply structure of this application. Figure 5 This is a schematic diagram of the interior structure on top of the sliding door and the sliding door frame in this application; Figure 6 This is a cross-sectional view of the left and right air ducts of this application. Detailed Implementation
[0014] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.
[0015] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.
[0016] like Figures 1 to 6 As shown, a plug door integrated structure adapted to buses includes an upper air duct body 11 and a lower door decoration 12. The upper air duct body 11 is fixed to the inner side crossbeam of the vehicle roof. The upper air duct body 11 is injection molded from ABS engineering plastic and has an overall U-shaped cover structure. It is fixed to the inner side beam of the vehicle roof with bolts. The coverage area corresponds to the top and outer side of the right air duct 22 of the plug door adaptable vacuum forming air duct structure 2. Its inner sidewall is tightly attached to the outer surface of the right air duct 22 with a fitting gap of ≤1.5mm to ensure that the structure is stable and has no lateral or vertical sway. The upper air duct body 11 is symmetrically provided with two rectangular maintenance doors 111 along the longitudinal direction of the vehicle. The maintenance doors 111 are connected by M4 bolts with a bolt spacing of 150-200mm. The central axis of the door body corresponds to the core maintenance points of the plug door mechanism, such as the door pump connection end and the crank arm rotation node. Opening the maintenance door 111 allows direct access to the plug door mechanism without disassembling the upper air duct body 11 or other peripheral parts, which greatly simplifies the maintenance operation process. The lower door trim 12 is made of flax fiber and PVC composite substrate and is arranged in a long strip along the inner edge of the top of the sliding door. Its upper edge is seamlessly connected to the lower outer surface of the right air duct 22 and is fastened to the pre-set threaded hole at the bottom of the right air duct 22 by M3 bolts. The lower part of the lower door trim 12 extends to the upper part of the sliding door frame, and its inner wall is completely attached to the lower outer surface of the right air duct 22. EVA sponge sealing strips are pasted at the joint. The strips are continuously arranged along the joint edge without any breaks, which not only prevents the air conditioning air from leaking out of the gaps, but also covers the bolt connection marks and improves the aesthetics of the interior. At the same time, the flatness error of the outer surface of the lower door trim 12, the outer surface of the right air duct 22, and the outer surface of the sliding door frame is strictly controlled within 0.8mm to ensure that there are no obvious steps or misalignments from the visual angle inside the vehicle, which meets the uniformity requirements of bus interiors.
[0017] The sliding door-adaptive vacuum-formed air duct structure 2 includes a left air duct 21 and a right air duct 22. The left air duct 21 is fixed on the inner side crossbeam of the vehicle roof, and the right air duct 22 is connected to the upper air duct body 11. The lower door decoration 12 is connected to the right air duct 22 by bolts. The left air duct 21 and the right air duct 22 are symmetrically distributed along the transverse direction of the vehicle. The left air duct 21 is fixed to the inner crossbeam of the vehicle roof with bolts. Every 300-400mm along the longitudinal direction of the top, there is a set of M6 threaded holes with metal inserts. The bolts pass through the threaded holes and are fastened to the pre-set mounting holes of the inner crossbeam of the roof, ensuring that the left air duct 21 does not loosen or shift under the bumpy conditions of vehicle driving. The side of the left air duct 21 facing the inside of the vehicle is designed as a concave arc surface 212 structure with a radius of curvature of 1200-1300mm. This design can optimize the contour of the interior roof space and reduce the sense of oppression when passengers are standing. A speaker mounting platform 213 is pre-set on the arc surface 212. The depth of the platform is 15-20mm and the inner diameter is adapted to the outer diameter of the standard vehicle speaker. The speaker is fixed in the platform 213 with M2 bolts, and the outer wall of the speaker is completely fitted with the inner wall of the platform 213, ensuring that the speaker is installed stably and does not occupy additional interior space.
[0018] The right-side air duct 22 is fastened to the upper air duct body 11 with M4 bolts. The right-side air duct 22 is arranged to fit the top mechanism of the sliding door. The gap between its inner wall and the sliding door mechanism is strictly controlled at 5-10mm. This gap not only avoids mechanical interference between the right-side air duct 22 and the sliding door during opening and closing, but also makes the most of the unused space at the top of the sliding door. The top of the right-side air duct 22 is also pre-set with an M6 threaded hole with a metal insert, which can help improve the connection stability with the upper air duct body 11. The left-side air duct 21 and the right-side air duct 22 are symmetrically distributed along the transverse direction of the vehicle. The center distance between the two is designed according to the width of the bus model to ensure a balanced internal structural layout and avoid stress concentration caused by unilateral imbalance.
[0019] The air conditioning vent air supply structure 3 is fixed on the crossbeam of the vehicle roof and is connected to the left air duct 21 and the right air duct 22 respectively. The air conditioning vent air supply structure 3 includes a left air outlet 31, a right small air outlet 32, a right large capacity air outlet 33 and a duct 34. The left air outlet 31 is connected to the chamber of the left air duct 21, the right large capacity air outlet 33 is connected to the chamber of the left air duct 21 through the duct 34, and the right small air outlet 32 is connected to the right air duct 22.
[0020] The right-side air vent is located at the lower part of the right-side air duct 22, corresponding to the right rear seat area of the vehicle. The right-side small air inlet 32 is connected to the right-side air duct 22 through the first air duct 35. The air guide duct 34 has flange structures at both ends, one end of which is fastened to the right-side large-capacity air inlet 33, and the other end is fastened to the left-side air duct 21. The left-side air vent is located on the side and lower part of the left-side air duct 21, corresponding to the passenger area and the driver area respectively. The left-side air inlet 31 is connected to the chamber of the left-side air duct 21 through the second air duct 36.
[0021] The air conditioning unit outputs air conditioning air (cold or hot air) first to the air conditioning vent structure 3 fixed to the roof beam, and then it is divided into three paths through the preset airflow channels in the structure. The first air conditioning airflow directly enters the left air inlet 31. Since the left air inlet 31 is connected to the internal chamber of the left air duct 21, the airflow flows directly into the interior of the left air duct 21 along the left air inlet 31. The second air conditioning air enters the large-capacity air inlet 33 on the right side. The large-capacity air inlet 33 on the right side is sealed and connected to the internal cavity of the air duct 21 on the left side through the air guide pipe 34. The air guide pipe 34 adopts a flexible sealing structure to prevent airflow from overflowing. Therefore, the airflow enters the air guide pipe 34 through the large-capacity air inlet 33 on the right side, and is then transported to the interior of the air duct 21 by the air guide pipe 34 to supplement the air volume of the air duct 21. The third air conditioning air enters the right small air inlet 32. Since the right small air inlet 32 is directly connected to the internal chamber of the right air duct 22, the airflow flows directly into the inside of the right air duct 22 along the right small air inlet 32. After the left air duct 21 obtains air conditioning air through the left air inlet 31 and the air guide 34, the airflow is evenly diffused along the longitudinal direction of the vehicle in the left air duct 21 because the left air duct 21 is a closed chamber formed by vacuum forming. Finally, the airflow is directionally output through the preset left air outlet on the left air duct 21 to achieve air conditioning air coverage of the passenger area and driver area. After the air conditioner air is obtained through the right small air inlet 32, the airflow flows longitudinally in the closed chamber of the right air conditioner 22 and is then output through the preset right air outlet on the right air conditioner 22 to accurately meet the air conditioning needs of the right rear seat area. The air intake design of the air conditioning vent structure 3 allows for flexible airflow distribution according to the air conditioning needs of different areas inside the vehicle: the large-capacity air intake 33 on the right side supplements the airflow to the left air duct 21 through the air guide duct 34, avoiding insufficient airflow caused by the left air duct 21 relying solely on the left air intake 31; the small air intake 32 on the right side supplies air to the right air duct 22 independently, ensuring independent and sufficient airflow in the right rear seat area; finally, through the left air vent of the left air duct 21 and the right air vent of the right air duct 22, the air conditioning airflow evenly covers the passenger area, driver area, and right rear seat area inside the vehicle, meeting the driving and riding comfort needs of different functional areas of the bus.
[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An integrated structure for sliding doors adapted to public buses, characterized in that, include The interior structure on the top of the sliding door includes the upper air duct body and the lower door decoration. The upper air duct body is fixed to the inner side crossbeam of the vehicle roof. The sliding door is equipped with a vacuum-formed air duct structure, which includes a left air duct and a right air duct. The left air duct is fixed to the inner crossbeam of the vehicle roof, and the right air duct is connected to the upper air duct body. The lower door decoration is connected to the right air duct by bolts. The left and right air ducts are symmetrically distributed along the vehicle's transverse direction. The air conditioning vent structure is fixed to the crossbeam on the vehicle roof and connected to the left and right air ducts respectively. The air conditioning vent structure includes a left air inlet, a right small air inlet, a right large capacity air inlet, and a duct. The left air inlet is connected to the chamber of the left air duct, the right large capacity air inlet is connected to the chamber of the left air duct through the duct, the right small air inlet is connected to the right air duct, and a left air vent is opened on the left air duct and a right air vent is opened on the right air duct.
2. The integrated structure for a sliding door adapted to a bus as described in claim 1, characterized in that, Both the left and right air ducts have pre-set threaded holes with metal inserts at the top. The left air duct is fastened to the pre-set mounting holes on the inner side beam of the roof by bolts passing through the threaded holes. The right air duct is fastened to the upper air duct body by bolts and is set to fit the top mechanism of the sliding door. The gap between its inner wall and the sliding door mechanism is 5-10mm.
3. The integrated structure for a sliding door adapted to a bus as described in claim 2, characterized in that, The upper air duct body covers the top and outer side of the right air duct, and its inner wall is attached to the outer surface of the right air duct. The upper air duct body is provided with two inspection doors, which are movably connected by bolts and correspond to the inspection points of the sliding door mechanism.
4. The integrated structure for a sliding door adapted to a bus as described in claim 3, characterized in that, The lower decoration is arranged along the inner edge of the top of the sliding door, and its upper edge connects with the lower outer surface of the right air duct. The upper part of the lower decoration is fastened to the lower part of the right air duct by bolts. The lower part of the lower decoration extends to the upper part of the sliding door frame, and the inner wall is attached to the lower part of the right air duct. A sponge sealing strip is provided at the attachment point.
5. The integrated structure for a sliding door adapted to a bus as described in claim 4, characterized in that, The right-side air vent is located at the lower part of the right-side air duct, corresponding to the right rear seat area of the vehicle. The small right-side air inlet is connected to the right-side air duct through the first air duct. The air duct has flange structures at both ends, one end of which is fastened to the large-capacity right-side air inlet, and the other end is fastened to the left-side air duct. The left-side air vent is located on the side and lower part of the left-side air duct, corresponding to the passenger area and driver area respectively. The left-side air inlet is connected to the left-side air duct chamber through the second air duct.
6. The integrated structure for a sliding door adapted to a bus as described in claim 5, characterized in that, The lower part of the door decoration is made of flax composite substrate, and the flatness error between the outer surface of the lower part of the door decoration and the outer surface of the right air duct and the outer surface of the sliding door frame is less than 0.8mm.
7. The integrated structure for a sliding door adapted to a bus as described in claim 6, characterized in that, Both the left and right air ducts are vacuum-formed in one piece. The left air duct has a concave arc structure facing the inside of the vehicle. A recessed platform for mounting a horn is provided on the arc surface of the left air duct. The horn is fixed in the recessed platform with bolts, and the outer wall of the horn is attached to the inner wall of the recessed platform.
8. The integrated structure for a sliding door adapted to a bus as described in claim 7, characterized in that, The air duct is made of flexible PVC.