7-meter-level short-rear-overhang parallel-shaft electrically-driven low-entrance urban bus chassis

Abstract

The utility model discloses a 7-meter-level short rear overhang parallel shaft electric drive low-entrance city bus chassis, which relates to the technical field of city buses, and comprises a chassis frame and a floor framework main body, the chassis frame comprises a low floor front axle, a frame front overhang section, a long wheelbase frame middle section, an ultra-short rear overhang section and a frame rear axle, the full-air spring suspension system has the advantages that the full-air spring suspension system with two front parts and four rear parts is adopted, the offset frequency is lower, the smoothness is better, the problems that a conventional composite suspension is poor in smoothness and large in vibration are solved, and the full-air spring suspension system with the two front parts and the four rear parts is adopted. Through the arrangement structure of the low-floor front axle, the long axle distance and the ultra-short rear overhang, the barrier-free passage from the front door to the rear door is achieved, getting on and off are convenient, and passengers flow smoothly and safely.

Description

TECHNICAL FIELD

[0001] The utility model relates to city bus technical field, concretely is a 7 meters level short rear suspension parallel axle electric drive low entry city bus chassis. BACKGROUND

[0002] City bus as a main walking tool of a city, bears a city main traffic transport service, along with the progress of science and technology, more and more dense population in big city, more and more kinds of public traffic, subway, light rail, network taxi, shared bicycle, electric bicycle and various public traffic travel;These public traffic shunts the passenger source of city bus, the sustained decline of city bus passenger traffic, the sharp reduction of operating income, lead to many bus companies "not enough to pay for", even fall into the predicament of stop operation, this to the future development of city bus is full of challenge, to city traffic, bus is still the future development direction, because in traffic resource utilization, relieving traffic congestion, green travel, saving land resources and so on, it has the advantage;

[0003] The applicant finds that a large-scale pure electric city bus two-step chassis flat floor structure has been disclosed in Chinese patent, and the publication (announcement) number is CN210502900U.The patent mainly makes the chassis frame middle section flush with the floor skeleton, so that the vehicle interior reaches the flat floor structure, four through warehouses are arranged in the chassis frame middle section, the chassis installation space is effectively improved, the two-step steps are set up for the convenience of passengers to get on and off the vehicle, and passengers can conveniently get on and off the vehicle.However, the vehicle tire configuration and the setting of the transmission components are not reasonable, the vehicle stability is poor, it is difficult to maintain the braking ability when the rear single tire fails, the risk of fishtailing is prone to occur, and the traditional transmission structure relies on transmission shafts and other components, the transmission efficiency is not high, and it is not conducive to energy saving and environmental protection, therefore, the 7-meter-level short rear suspension parallel axle electric drive low-entry city bus chassis is provided. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a 7-meter-level short rear suspension parallel axle electric drive low-entry city bus chassis.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a 7-meter-level short rear suspension parallel axle electric drive low-entry city bus chassis, comprising a chassis frame and a floor skeleton main body, the chassis frame comprises a low-floor front axle, a frame front suspension section, a long-axle-distance frame middle section, an ultra-short rear suspension section and a frame rear axle, the low-floor front axle, the frame front suspension section, the long-axle-distance frame middle section, the ultra-short rear suspension section and the frame rear axle are sequentially welded and fixed, a front suspension assembly is installed below the frame front suspension section, a rear suspension assembly is installed below the ultra-short rear suspension section, first full air spring mechanisms are arranged at both ends of the front suspension assembly, and two groups of second full air spring mechanisms are arranged at both ends of the rear suspension assembly.

[0006] As a further scheme of the utility model: the long wheelbase frame middle section length is 4550mm, the ultra-short rear suspension section is provided with a gas supply mechanism, a steering mechanism and a cooling mechanism.

[0007] As a further scheme of the utility model: the first full air spring mechanism is provided with two groups and is located at the middle two ends of the front suspension assembly, the second full air spring mechanism is provided with four groups and is located at the middle two ends of the rear suspension assembly.

[0008] As a further scheme of the utility model: the floor framework main body comprises a front section floor framework assembly, a middle zone floor framework assembly and a rear tail step floor framework assembly.

[0009] As a further scheme of the utility model: the front section floor framework assembly and the middle zone floor framework assembly are each provided with a first step assembly, and a first step is arranged on the first step assembly.

[0010] As a further scheme of the utility model: the low floor front axle is connected with front tires at two ends, and the frame rear axle is connected with two groups of rear tires at two ends.

[0011] As a further scheme of the utility model: a plurality of square steels are welded in the long wheelbase frame middle section.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The utility model adopts a front 2 rear 4 full air spring suspension system, the frequency deviation is lower, the smoothness is better, and the problems of poor smoothness and large vibration of the conventional composite suspension are solved.

[0014] 2. The utility model adopts a low floor front axle, a long wheelbase and an ultra-short rear suspension arrangement structure, realizes barrier-free access from the front door to the rear door, facilitates getting on and off the vehicle, and passenger flow is smooth and safe.

[0015] 3. The utility model adopts front 2 rear 4 tires, the vehicle stability is better, once the rear tire fails, a certain braking ability can be maintained, and the risk of fishtailing is reduced.

[0016] Other advantages, objects and features of the utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a front view schematic diagram of the device as a whole in the embodiment of the utility model;

[0018] Figure 2 is a schematic view of the device in the embodiment of the utility model from below;

[0019] Figure 3 is a schematic view of the front suspension assembly in the embodiment of the utility model;

[0020] Figure 4 is a schematic view of the rear suspension assembly in the embodiment of the utility model;

[0021] Figure 5 is a schematic view of the low-floor front axle in the embodiment of the utility model.

[0022] In the figure: 1, chassis frame; 101, low-floor front axle; 102, front suspension section of frame; 103, middle section of long-wheelbase frame; 104, ultra-short rear suspension section; 105, rear axle of frame; 2, main body of floor framework; 201, front section floor framework assembly; 202, middle section floor framework assembly; 203, rear tail section step floor framework assembly; 3, front suspension assembly; 4, rear suspension assembly; 5, first full air spring mechanism; 6, second full air spring mechanism. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model will be further described below in conjunction with the drawings, and it should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation on the utility model.

[0024] In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict between them.

[0025] Please refer to the drawings Figure 1 - the drawings Figure 5The utility model relates to a 7-meter short rear overhang parallel shaft electric drive low entrance city passenger car chassis, chassis frame 1 includes low floor front axle 101, frame front overhang section 102, long wheelbase frame middle section 103, ultra-short rear overhang section 104 and frame rear axle 105, low floor front axle 101, frame front overhang section 102, long wheelbase frame middle section 103, ultra-short rear overhang section 104 and frame rear axle 105 are welded and fixed in proper order, low floor front axle 101 is at the front end position of whole frame, it provides the key connection and the bearing basis for the front part of vehicle, and its design often has to consider the adaptability with multiple components and the adaptability to different road conditions, frame front overhang section 102 is followed low floor front axle 101, it plays the role of transition and connection on structure, not only has to ensure the stable connection with front axle, but also needs to provide accurate positioning and reliable support for the installation of subsequent frame middle section, long wheelbase frame middle section 103 is the core bearing area of whole chassis frame 1, because of its long wheelbase characteristics, can provide more stable running performance for vehicle, and can better disperse the body weight, adapts to different load requirements, ultra-short rear overhang section 104 is located at the rear end of frame, although rear overhang section is short, but has the inestimable effect on the controllability of vehicle and the structural integrity of rear part, it is closely connected with frame rear axle 105, and bears the various mechanical effects of rear part of vehicle together, frame rear axle 105 is as the key component of rear part of vehicle, is responsible for driving wheel and bearing the load and road surface reaction force from rear part, frame front overhang section 102 below is installed with front suspension assembly 3, ultra-short rear overhang section 104 below is installed with rear suspension assembly 4, both ends of front suspension assembly 3 are provided with first full air spring mechanism 5, both ends of rear suspension assembly 4 are provided with two groups of second full air spring mechanism 6.

[0026] Embodiment one, long wheelbase frame middle section 103 length is 4550mm, ultra-short rear overhang section 104 is installed with gas supply mechanism, steering mechanism and cooling mechanism, first full air spring mechanism 5 is equipped with two groups, and is located in the middle two ends of front suspension assembly 3, second full air spring mechanism 6 is equipped with four groups, and is located in the middle two ends of rear suspension assembly 4,

[0027] Specifically, the long wheelbase can effectively increase the driving stability of the vehicle, reduce the shaking and tilting of the vehicle body when driving at high speed, and provide a more stable and comfortable riding experience for the driver and passengers. Compared with the long rear suspension structure, the ultra-short rear suspension structure reduces the height of the center of gravity under the same load capacity, improving the stability of the vehicle. Reducing the length of the rear suspension significantly reduces the requirement for structural strength, reducing the waste caused by excessive suspension, and the two groups of first full air spring mechanisms 5 arranged at the middle and both ends of the front suspension assembly 3 can adapt to the ups and downs of the road in real time through precise air pressure adjustment mechanism. When the vehicle is driving on uneven road surface, the air spring will automatically adjust the internal air pressure according to the degree of bumping, thereby changing the stiffness and damping characteristics of the spring, effectively absorbing and filtering vibration, and significantly improving the riding comfort of the vehicle. Moreover, this air spring mechanism can also automatically maintain the relative stability of the vehicle body height when the vehicle load changes, avoiding excessive sinking of the vehicle body due to increased load, ensuring the passability and driving safety of the vehicle. The four groups of second full air spring mechanisms 6 at the middle and both ends of the rear suspension assembly 4 have stronger ability to bear the heavy load of the rear of the vehicle based on their larger number and reasonable layout. They work together to more accurately balance the weight distribution of the rear of the vehicle.

[0028] In embodiment two, the floor skeleton main body 2 includes a front section floor skeleton assembly 201, a middle section floor skeleton assembly 202, and a rear tail section stepped floor skeleton assembly 203. The front section floor skeleton assembly 201 and the middle section floor skeleton assembly 202 are each provided with a first step assembly, and the first step assembly is provided with a first step. The low-floor front axle 101 is connected with front tires at both ends, the frame rear axle 105 is connected with two groups of rear tires at both ends, and a plurality of square steels are welded in the long wheelbase frame middle section 103.

[0029] Specifically, the first step assembly and the first step of the front section floor skeleton assembly 201 facilitate the opening of the door for passengers, and the reasonable height and anti-slip design help passengers to safely step in. The middle section floor skeleton assembly 202 has the same configuration to continuously ensure smooth passage of passengers in the middle section of the vehicle cabin, and its structural strength can withstand the weight of multiple people and frequent stepping to provide stable support for activities inside the vehicle. The rear tail section stepped floor skeleton assembly 203 is constructed according to the shape of the rear of the vehicle to optimize the space layout and make the functional partitioning of the rear of the vehicle more reasonable. The front tires at both ends of the low-floor front axle 101 are closely connected with the front axle, and have good grip and adaptability, allowing the vehicle to start smoothly and turn flexibly. The two groups of rear tires at both ends of the frame rear axle 105 bear the load and driving responsibility of the rear of the vehicle, and have strong load capacity and damping performance to ensure the stability of the rear of the vehicle during driving. The plurality of square steels in the long wheelbase frame middle section 103 are welded together to form a solid core, greatly enhancing the rigidity and strength of the frame, enabling it to withstand stress impact from various complex road conditions, and providing strong protection for the safety and durability of the vehicle as a whole.

[0030] Working principle:

[0031] First chassis frame 1, low floor front axle 101, frame front suspension section 102, long wheelbase frame middle section 103, ultra-short rear suspension section 104 and frame rear axle 105 are welded in turn to form a stable overall frame, the front suspension assembly 3 and the rear suspension assembly 4 realize the shock absorption and vehicle height adjustment function through the corresponding first full air spring mechanism 5 and the second full air spring mechanism 6 respectively, when the vehicle encounters road bumps during driving, the air pressure in the air spring changes, absorbs vibration energy, ensures the stability of the vehicle body, improves the riding comfort; and can automatically maintain the horizontal height of the vehicle body under different load conditions, ensure the stability and passability of the vehicle driving posture, the air supply mechanism of the ultra-short rear suspension section 104 provides air source for the pneumatic components such as air spring, the steering mechanism enables the rear part of the vehicle to accurately steer to cooperate with the whole vehicle steering action, the cooling mechanism ensures that the related parts are suitable in temperature during operation, prevents overheating damage, the parts of the floor skeleton main body 2 provide support and layout basis for the interior space, the first step of the front section floor skeleton assembly 201 and the middle section floor skeleton assembly 202 facilitates passengers to get on and off the vehicle and move forward and backward in the vehicle, the front tires at both ends of the low floor front axle 101 and the two groups of rear tires at both ends of the frame rear axle 105 bear the weight of the vehicle body and generate friction with the ground, push the vehicle forward, steer and brake, the front tires ensure the flexibility of the front part of the vehicle, the rear tires enhance the stability and riding stability of the rear part due to the layout of the two groups, the square steel in the long wheelbase frame middle section 103 enhances the overall rigidity and strength of the frame, so that the frame can maintain structural integrity and stability when bearing the weight of the vehicle body, passenger load, road impact force and torsional force during vehicle driving and other complex external forces, thus the whole working process is completed.

[0032] The above front, rear, left, right, up and down are based on the drawings of the specification Figure 1 As the standard of the human observation angle, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0033] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the protection scope of the utility model.

[0034] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the described embodiments.

[0035] For those skilled in the art, various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis, comprising a chassis frame (1) and a floor frame body (2), characterized in that: The chassis frame (1) comprises a low-floor front axle (101), a frame front overhang section (102), a long-wheelbase frame middle section (103), an ultra-short rear overhang section (104) and a frame rear axle (105); the low-floor front axle (101), the frame front overhang section (102), the long-wheelbase frame middle section (103), the ultra-short rear overhang section (104) and the frame rear axle (105) are welded and fixed in sequence; a front suspension assembly (3) is installed below the frame front overhang section (102); a rear suspension assembly (4) is installed below the ultra-short rear overhang section (104); both ends of the front suspension assembly (3) are provided with a first full-air spring mechanism (5); and both ends of the rear suspension assembly (4) are provided with two sets of second full-air spring mechanisms (6).

2. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 1, characterized in that: The length of the long wheelbase frame middle section (103) is 4550 mm, and the ultra-short rear overhang section (104) is equipped with an air supply mechanism, a steering mechanism, and a cooling mechanism.

3. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 1, characterized in that: The first full air spring mechanism (5) is provided with two groups and is located at both ends of the middle part of the front suspension assembly (3); the second full air spring mechanism (6) is provided with four groups and is located at both ends of the middle part of the rear suspension assembly (4).

4. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 1, characterized in that: The floor frame body (2) comprises a front floor frame assembly (201), a middle floor frame assembly (202) and a rear step floor frame assembly (203).

5. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 4, characterized in that: The front floor frame assembly (201) and the middle floor frame assembly (202) are both provided with a first-stage step assembly, and the first-stage step assembly is provided with a first-stage step.

6. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 1, characterized in that: Both ends of the low-floor front axle (101) are connected to front tires, and both ends of the frame rear axle (105) are connected to two sets of rear tires.

7. The 7-meter-class short rear overhang parallel-axle electric drive low-entry city bus chassis according to claim 1, characterized in that: A plurality of square steels are welded in the middle section (103) of the long wheelbase frame.

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