CN106364561B - One kind biases narrow keel bearing-type the Structure of Bus Body and its left and right sides Rigidity Matching method - Google Patents

Abstract

The invention discloses an offset narrow keel load-bearing road bus body structure, comprising: a middle section of the underframe, which is located in the middle of the underframe of the vehicle body; The middle section of the underframe; the left truss of the keel is fixedly connected to the right truss through a connecting beam; wherein, the left truss and the right truss have a certain distance, and a movable diagonal brace is installed on the longitudinal plane of the left truss , installing a fixed diagonal brace on the longitudinal plane of the right truss. The invention also discloses a rigidity matching method of the left and right sides of the body structure of the offset narrow keel load-bearing road passenger car.

Description

An offset narrow keel bearing road bus body structure and its left and right side stiffness matching recipe

technical field

The invention relates to the structure design of a passenger car body, in particular to an offset narrow keel load-bearing road passenger car body structure and a method for matching rigidity of left and right sides.

Background technique

Under the background of continuous improvement of urbanization level, medium and short-distance highway traffic develops rapidly, among which highway buses play an irreplaceable role and are widely used. Therefore, it is particularly important to reduce the weight of road buses.

At present, most of the keel structures in the load-bearing bus bodies of domestic and foreign bus companies are set in a multi-layer left-right symmetrical form. Studies have shown that the load of the load-bearing body structure is mainly borne by the peripheral structures such as the left and right side walls, while the central keel can actually only bear a small part of the load. In the peripheral structure, the rigidity of the right side wall is insufficient due to the front and rear doors of the passenger door, which leads to unreasonable stress on the body structure and asymmetric overall performance of the body. In reality, in order to solve the problem of insufficient rigidity on the right side of the body structure, the conventional solution is to increase the number of keel layers, the number and size of diagonal braces, and install some rods for strengthening the stiffness to increase the stiffness of the right side wall, which virtually increases the The mass of the body is increased, and the production cost is increased.

Contents of the invention

Based on the problems existing in the above-mentioned prior art, the present invention designs and develops an offset narrow keel load-bearing road passenger car body structure. High quality and high cost issues.

The present invention also designs and develops a method for matching the rigidity of the left and right side of the body structure of the offset narrow keel bearing type road passenger car. The purpose of the present invention is to achieve a reasonable force on the body structure and matching of the rigidity of the left and right sides by determining the offset position of the keel. Purpose.

The technical scheme provided by the invention is:

An offset narrow keel load-bearing highway bus body structure, comprising:

mid-frame section, which is located in the middle of the underframe; and

a keel, which runs through the middle section of the chassis along the right side of the central axis of the middle section of the chassis;

The truss on the left side of the keel is fixedly connected to the truss on the right side through the connecting beam;

Wherein, the distance between the left truss and the right truss is 200 mm to 250 mm, movable diagonal braces are installed on the longitudinal plane of the left truss, and fixed diagonal braces are installed on the longitudinal plane of the right truss, The offset range of the keel along the right side of the central axis of the middle section of the chassis is 100 mm to 300 mm.

Preferably, under the middle section of the underframe is a luggage compartment, which is divided into left and right sides by the keel; and

Above the underframe of the vehicle body is the passenger compartment.

Preferably, the left side truss and the right side truss further respectively include: passenger compartment floor stringers, luggage compartment floor stringers and columns;

The passenger compartment floor girder is connected to the luggage compartment floor girder through the uprights, and the movable or fixed slanting braces are respectively arranged between adjacent uprights.

Preferably, the luggage compartment further includes a luggage compartment floor beam, and the passenger compartment further includes a passenger compartment floor beam and a passenger compartment floor connecting beam;

Wherein, V-shaped diagonal braces are respectively arranged on both sides of the left truss and the right truss, and between the luggage compartment floor beam and the passenger compartment floor beam.

Preferably, the middle section of the underframe is connected to the passenger compartment floor of the front section of the underframe and the passenger compartment floor of the rear section of the underframe through V-shaped braces, and the top ends of the V-shaped braces are welded to As for the passenger compartment floor beam, one side of the V-shaped brace is welded to the left truss, and the other side is welded to the left side wall.

Preferably, the luggage compartment floor is connected to the front section of the underframe and the rear section of the underframe through V-shaped diagonal braces, and the top ends of the V-shaped diagonal braces are welded to the luggage compartment floor beams, so One side of the V-shaped brace is welded to the left side truss, and the other side is welded to the left side wall.

Preferably, the two ends of the movable brace are welded with connecting pieces, which are fixedly connected with the connecting pieces welded on the skeleton through bolts.

Preferably, the fuel tank is installed between the truss structure on the left side of the keel and the truss structure on the right side of the keel on the floor layer of the luggage compartment.

A method for matching the stiffness of the left and right sides of an offset narrow keel load-bearing road passenger car body structure, comprising the following steps:

Step 1, calculating the bending stiffness K of the vehicle body;

Step 2. On the basis of the body structure, the relative distance between the left truss and the right truss of the middle section of the underframe keel and the central axis is proportionally reduced, and the distance between the trusses on the left and right sides of the keel after the distance is reduced is L;

Step 3, install the keel as a whole along the right side of the central axis of the middle section of the underframe, the offset distance is Y, and the bending stiffness of the body is K _Y ;

Step 4. Offset the whole keel to the right side along the central axis of the middle section of the underframe to the limit position, the offset distance is Y _max , and calculate the bending stiffness K _Ymax of the vehicle body at this time;

Step 5. Move the entire keel to the left along the central axis of the middle section of the chassis by 0.05L. At this time, the offset distance of the keel is which is and calculate the body bending stiffness

Step six, when When the overall keel is biased to the right, several equidistant points are taken between the initial position before the overall keel is offset to the right and the limit position after the overall keel is offset to the right, and the offset distance of the keel and the bending stiffness of the vehicle body corresponding to the offset distance are recorded respectively. , where the offset distance corresponding to the maximum body bending stiffness is the final offset distance;

when , the offset distance Y _max is the final offset distance.

Preferably, it includes: the distance between the left truss and the right truss is 200 mm to 250 mm, and the offset range of the keel along the middle axis of the bottom frame to the right is 100 mm to 300 mm.

Compared with the prior art, the present invention has the beneficial effects:

1. The present invention narrows the distance between the truss structure on the left side of the keel and the truss structure on the right side, which provides space for the overall left and right offset of the keel, and then offsets the overall keel to the right by a certain distance, thereby appropriately reducing the left Side stiffness and increase the stiffness of the right side, and finally by adjusting the size of the offset to achieve the best match of the stiffness of the left and right sides, this method is simple and easy, and has good operability and implementability;

2. The present invention adds movable diagonal braces to the longitudinal plane of the truss structure on the left side of the keel, which can increase the stiffness of the keel and facilitate the loading and unloading of the fuel tank. At the same time, a fixed diagonal brace is added to the longitudinal plane of the truss structure on the right side of the keel , which also increases the stiffness of the keel;

3. The fuel tank is placed between the keels on both sides of the luggage compartment floor, and the original fuel tank room is merged into the luggage compartment, which increases the space for passengers to take and put luggage in the left and right luggage compartments, making it easier for passengers to take and put luggage For convenience, the use safety of the fuel tank is also improved.

Description of drawings

Figure 1 is a schematic diagram of the distance between the truss structures on both sides of the reduced keel in the middle section of the underframe.

Fig. 2 is a view of the transverse section A-A of Fig. 1 .

Fig. 3 is a schematic diagram of the overall rightward offset of the keel in the middle section of the underframe.

Fig. 4 is a schematic diagram of the truss structure on the left side of the keel in the middle section of the underframe.

Fig. 5 is a schematic diagram of the truss structure on the right side of the keel in the middle section of the underframe.

Fig. 6 is a top view of the underframe of the vehicle body of the present invention.

Fig. 7 is a front view of the underframe of the vehicle body of the present invention.

Fig. 8 is a view of cross section B-B in Fig. 6 .

Fig. 9 is a cross-sectional C-C view of Fig. 7 .

Fig. 10 is a plan view of the passenger compartment floor in the middle section of the underframe of the vehicle body according to the present invention.

Fig. 11 is a plan view of the luggage compartment floor in the middle section of the underframe of the vehicle body of the present invention.

Fig. 12 is a partial schematic diagram of the joint of the movable diagonal brace in Fig. 7 .

Figure 13 is Schematic diagram of the regular curve of keel offset distance and body bending stiffness.

Figure 14 is Schematic diagram of the regular curve of keel offset distance and body bending stiffness.

Fig. 15 is an overall schematic diagram of the vehicle body in a specific embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

As shown in Figures 1 to 12, the present invention provides a body structure of an offset narrow keel load-bearing road passenger car. The body structure is composed of front and rear walls, a top cover, left and right sides, and an underframe. Wherein, the underframe of the vehicle body is divided into the front section 1 of the underframe, the middle section 2 of the underframe and the rear section 3 of the underframe. 2. The dotted line is the position of the overall offset of the keel 36. The truss structure 4 on the left side of the keel and the truss structure 5 on the right side of the keel are connected together through the passenger compartment floor connecting beam 43 and the luggage compartment floor connecting beam; where, as shown in Figure 1 As shown by the dotted line, the distance between the truss structure 4 on the left side of the keel and the truss structure 5 on the right side of the keel is reduced from the traditional 650 mm to 800 mm to 200 mm to 250 mm to meet the width of the fuel tank 34. The solid line is the position of the keel in the prior art, that is, the position of the trusses on both sides of the keel before the change, and the dotted line is the position after the distance between the trusses on both sides of the keel is reduced. At the same time, the truss structure on the left side of the keel in the middle section 2 The longitudinal plane of 4 adds movable diagonal braces 14-16, and sets fixed diagonal braces 6-8 on the longitudinal plane of the truss structure 5 on the right side of the keel.

In another embodiment, the offset range of the keel 36 to the right side of the central axis of the middle section of the chassis 2 is 100 mm to 300 mm, and the maximum offset is subject to the constraint that the arrangement of the steps 35 is not affected.

In another embodiment, the luggage compartment is below the middle section of the underframe 2, and the passenger compartment is above the underframe of the vehicle body. The fuel tank 34 is placed between the truss structures on both sides of the keel of the middle section of the underframe 2 from the outside of the traditional keel, so that Two left and right luggage compartments 37, 38 can be formed at the bottom of the middle section of the vehicle body, which increases the space for passengers to take and place luggage in the luggage compartment, and is more conducive to passengers to take and place luggage.

In another embodiment, the truss structure 4 on the left side of the keel and the truss structure 5 on the right side of the keel further include: passenger compartment floor longitudinal beams 24, 25, luggage compartment floor longitudinal beams 29, 30, keel left truss columns 17- 21 and the truss columns 9-13 on the right side of the keel; the floor longitudinal beam 24 of the passenger compartment and the floor longitudinal beam 29 of the luggage compartment are connected by the truss columns 17-21 on the left side of the keel, and the movable diagonal braces 14-16 are arranged on the left side of the adjacent keel Between the truss columns 17-21, the passenger compartment floor longitudinal beam 25 and the luggage compartment floor longitudinal beam 30 are connected through the keel right truss columns 9-13, and the fixed diagonal braces 6-8 are arranged on the adjacent keel right truss column 9 ~13.

In another embodiment, the luggage compartment further includes luggage compartment floor beams 41, 42, the passenger compartment further includes passenger compartment floor beams 39, 40 and passenger compartment floor connecting beams 43, the keel left truss structure 4 and the keel right truss The structure 5 is connected by the passenger compartment floor beam 43 on the first floor of the passenger compartment, and connected by the luggage compartment floor beam and the diagonal bracing in the middle of the luggage compartment on the first floor of the luggage compartment; among them, the truss structure 4 on the left side of the keel and the truss structure on the right side of the keel 5, V-shaped diagonal braces 31 are respectively arranged between the luggage compartment floor beams 41, 42 and V-shaped diagonal braces 26 are arranged between the passenger compartment floor beams 39, 40, all in a wave-like arrangement.

In another embodiment, the middle section 2 of the underframe and the floor of the passenger compartment of the front section 1 of the underframe are welded and connected by V-shaped braces 27, and the middle section 2 of the underframe and the floor of the passenger compartment of the rear section 3 of the underframe are connected by V The V-shaped diagonal brace 28 is welded and connected, and the top of the V-shaped diagonal brace 27 is welded to the passenger compartment floor beam 39, the top of the V-shaped diagonal brace 28 is welded to the passenger compartment floor beam 40, and one side of the V-shaped diagonal brace 27, 28 is welded to the On the truss structure 4 on the left side of the keel, the other side is welded to the left side wall.

In another embodiment, the luggage compartment floor and the front section 1 of the underframe are welded and connected by a V-shaped brace 32, and the luggage compartment floor and the rear section 3 of the underframe are welded and connected by a V-shaped brace 33, and the V-shaped The top of the diagonal brace 32 is welded to the luggage compartment floor beam 41, the top of the V-shaped diagonal brace 33 is welded to the luggage compartment floor beam 42, one side of the V-shaped diagonal brace 32, 33 is welded to the truss structure 4 on the left side of the keel, and the other side Welded to the left side.

In another embodiment, the two ends of the movable brace are welded with connecting pieces 44, which are fixedly connected with the connecting piece 45 welded on the skeleton through bolts 46.

In order to make the structural scheme of the present invention clearer, the improvement that the present invention makes with 12 meters of highway bus body underframe structures is described in detail:

An offset narrow keel load-bearing road passenger car body structure proposed by the present invention, the underframe structure is shown in Figure 6 and Figure 7, the keel left truss structure 4 and right truss structure 5 of the keel middle section 2 of the bus body structure The pitch of the keel is reduced from 650mm to 250mm, and the whole keel is shifted to the right by 200mm. The truss structure on the right side of the keel after the shift is located in the same longitudinal plane as the truss structure on the right side of the keel of the front section 1 of the chassis and the rear section 3 of the chassis. Further, the arrangement of the step 35 is not affected, as shown in FIG. 6 , which makes the stiffness matching of the left and right sides more reasonable, and the force on the body structure tends to be symmetrical.

As shown in Figure 7, movable diagonal braces 14-16 are added to the longitudinal plane of the truss structure 4 on the left side of the keel of the middle section of the underframe 2. As shown in Figure 12, connecting pieces 44 are welded at both ends of the movable diagonal brace. The parts are fixed together with the connecting pieces 45 welded on the skeleton by bolts 46.

As shown in Figure 8, fixed diagonal braces 6-8 are added to the longitudinal plane of the truss structure 5 on the right side of the keel, and the angles of the fixed diagonal braces 6-8 can be adjusted according to the specific stress conditions.

Among them, as shown in Figures 7, 10, and 11, the truss structure 4 on the left side of the keel is composed of the passenger compartment floor longitudinal beam 24, the luggage compartment floor longitudinal beam 29, the columns 17-21, and movable braces 14-16. The longitudinal beam 24 and the luggage compartment floor longitudinal beam 29 are connected by columns 17-21, the height of which is 1355mm, and the length of the passenger compartment floor longitudinal beam 24 and the luggage compartment floor longitudinal beam 29 is 4280mm; as shown in Figures 8, 10 and 11, the keel The right truss structure 5 is composed of passenger compartment floor longitudinal beams 25, luggage compartment floor longitudinal beams 30, columns 9-13 and fixed diagonal braces 6-8, and the passenger compartment floor longitudinal beams 25 and luggage compartment floor ～13 connections, the height of the column is 1355mm, the length of the passenger compartment floor longitudinal beam 25 and the luggage compartment floor longitudinal beam 30 is 4280mm.

As shown in Figure 10, V-shaped diagonal braces 26 are arranged on both sides of the keel truss structure of the passenger cabin floor in the middle section of the underframe, and are arranged in a wave shape; The top end of the brace 27 is welded to the passenger compartment floor beam 39 and is located at the opposite position to the front section longitudinal beam 22 of the underframe (the truss structure on the left side of the keel is located in the same longitudinal plane as the front section longitudinal beam 22 of the underframe before the offset), at the same time, the V-shaped oblique One end of the brace is welded to the truss 4 on the left side of the keel (that is, the floor longitudinal beam 24 of the passenger compartment), and the other end is welded to the left wall to facilitate the transmission of longitudinal force. The middle section 2 of the underframe is connected to the rear section 3 of the underframe The top of the V-shaped bracing 28 at the position is welded to the passenger compartment floor beam 40. At the same time, one side end of the V-shaped bracing is welded to the truss 4 on the left side of the keel (that is, the passenger compartment floor longitudinal beam 24), and the other side end is welded on the left side to facilitate the transmission of longitudinal forces.

As shown in Figure 11, the luggage compartment floor is also arranged with V-shaped diagonal braces 31 on both sides of the keel left truss structure (4) and the right truss structure (5), which are arranged in a wave shape; the luggage compartment floor and the front section of the underframe 1 The top of the V-shaped brace 32 at the connection is welded to the luggage compartment floor beam 41, and one side end of the V-shaped brace 32 is welded to the truss 4 on the left side of the keel (that is, the luggage compartment floor longitudinal beam 29), and the other side end Welded to the left side wall to facilitate the transmission of longitudinal force, the top of the V-shaped brace 33 at the junction of the luggage compartment floor and the rear section 3 of the underframe is welded to the luggage compartment floor beam 42, and one side end of the V-shaped brace 33 is welded On the truss 4 on the left side of the keel (that is, the luggage compartment floor longitudinal beam 29), the other side end is welded to the left side wall to facilitate the transmission of longitudinal force.

As shown in Figure 9, the fuel tank is placed between the truss structures on both sides of the keel of the middle section of the underframe 2, and two left and right luggage compartments 37, 38 can be formed at the bottom of the middle section of the vehicle body, which increases the luggage compartment and is convenient for passengers to pick and place. The luggage space is more convenient for passengers to take and put luggage.

The rear passenger door is equipped with four steps, each step has a depth of 20mm, a height of 340mm, and a width of 800mm.

As shown in Figures 1 to 5, the present invention also provides a method for matching the rigidity of the left and right sides of the body structure of the off-set narrow keel-bearing road passenger car, the principle of which is as follows:

Calculate the bending stiffness of the original body, denoted as K; on the basis of the original body structure, reduce the relative distance between the left truss and the right truss of the middle keel of the underframe in proportion to the central axis; secondly, according to the Chinese highway traffic regulations, the The overall keel is offset to the limit position along the central axis of the middle section of the underframe to the side where the passenger door is opened (that is, the right side), and the bending stiffness of the vehicle body at this time is calculated, which is recorded as K ₁ ; again, before the overall keel is offset to the right Take m equidistant points between the initial position of the keel and the limit position after the keel is offset to the right as a whole, and calculate the bending stiffness of the vehicle body when the keel is offset to the right to the above equidistant points; finally, take the offset distance as the variable, the bending stiffness of the vehicle body is the dependent variable, and a regular curve is drawn, as shown in Figure 13. Find the offset distance corresponding to the maximum bending stiffness value from the figure, which is the optimal solution, so as to achieve the best matching of left and right stiffness.

In actual engineering applications, the optimal solution of the offset distance may be located on the right side of the limit position of the keel offset. The basis for judging is: the body bending stiffness K calculated after moving the entire keel from the limit position to the left by a small distance ₂ Compared with the body bending stiffness K ₁ when the keel is at the limit position on the right side, if K ₁ >K ₂ , the optimal solution of the offset distance is on the right side of the limit position of the keel offset, but due to the limitation of the step arrangement, the keel The extreme position placed on the right side can be regarded as the optimal solution. At this time, the schematic diagram of the regular curve is shown in Figure 14; if K ₁ <K ₂ , that is, the optimal solution of the offset distance is between the position before the overall keel is offset to the right. Between the initial position and the limit position after the overall keel is offset to the right, the schematic diagram of the curve at this time is shown in Figure 13, and the offset distance corresponding to the maximum bending stiffness is found from the figure as the optimal solution; if K ₁ =K ₂ , then the optimal solution of the offset distance is between the limit position of the keel offset to the right and the corresponding offset position after the keel moves a small distance to the left, and the offset distance corresponding to the maximum bending stiffness is found from the figure as the most Excellent solution.

Specifically include the following steps:

Step 1. Calculate the bending stiffness of the vehicle body, denoted as K;

Step 2. On the basis of the body structure, the relative distance between the left truss and the right truss of the middle section of the underframe keel and the central axis is proportionally reduced, and the distance between the trusses on the left and right sides of the keel after the distance is reduced is recorded as L, as shown in Figure 1 The truss distance L on the left and right sides of the keel shown in 48;

Step 3, install the keel as a whole along the right side of the central axis of the middle section of the underframe, the offset distance is recorded as Y, and the bending stiffness of the vehicle body is recorded as K _Y ;

Step 4. Offset the whole keel to the right along the central axis of the middle section of the chassis to the limit position, and the limit position of the right offset is based on the condition that the arrangement of the steps is not affected. At this time, the offset distance is recorded as Y _max , and Calculate the body bending stiffness at this time, denoted as K _Ymax ;

Step 5. On the basis of step 4, move the entire keel to the left along the central axis of the middle section of the chassis by 0.05L. At this time, the offset distance of the keel is recorded as which is And calculate the body bending stiffness, denoted as

Step 6. Compare with K _Ymax size, including:

when , the optimal solution of the keel offset distance is between the initial position before the overall keel offset and the limit position after the offset, and the initial position before the overall keel offset to the right and after the overall keel offset to the right Take m equidistant points between the limit positions of the keel, record the offset distance of the keel as Y ₁ , Y ₂ , ..., Y _m , and calculate the corresponding body bending stiffness K _Y1 , K _Y2 , ..., K _Ym ; The offset distance Y is the independent variable, and the bending stiffness K _Y of the vehicle body is used as the dependent variable to make a regular curve diagram, as shown in Figure 13. Finding the offset distance corresponding to the maximum bending stiffness of the vehicle body from the figure is the optimal solution; In the embodiment, m is 3～5;

when , the optimal solution of the offset distance is located on the right side of the limit position of the keel offset, but due to the limitation of the step arrangement, the offset distance Y _max corresponding to the limit position of the keel on the right is the optimal solution.

In another embodiment, the distance between the truss structure 4 on the left side of the keel and the truss structure 5 on the right side of the keel is 200 mm to 250 mm to meet the width of the fuel tank, and the offset range of the keel along the middle axis of the middle section 2 of the chassis to the right It is 100mm ~ 300mm, and the maximum offset of the keel is constrained by the arrangement that does not affect the steps.

Example

The present invention provides a method for matching the rigidity of the left and right sides of a body structure of an offset narrow keel load-bearing road passenger car, comprising the following steps:

Step 1. Measure the distance between the left truss and the right truss of the original body structure keel to be 650mm, and calculate the body bending stiffness K=1.05×10 ⁷ N/m;

Step 2. On the basis of the body structure, reduce the relative distance between the left truss and the right truss of the middle keel of the underframe in proportion to the central axis, and the distance between the trusses on the left and right sides of the keel after the reduction is L=250mm;

Step 3. Offset the whole keel to the right side along the central axis of the middle section of the underframe to the extreme position, the offset distance Y _max = 200mm, and calculate the body bending stiffness K _Ymax = 1.26×10 ⁷ N/m at this time;

Step 4. Move the whole keel to the left along the central axis of the middle section of the chassis by 10mm, that is and calculate the body bending stiffness

Step 5. Compare With the size of K _Ymax , at this time, Therefore, the offset distance Y _max =200mm corresponding to the bending stiffness K _Ymax of the vehicle body is the optimal solution, and the best matching of the left and right side stiffnesses can be realized accordingly.

According to the present invention, a 12-meter offset narrow keel load-bearing road passenger car body structure is designed, wherein the length of the middle section of the underframe is 6.175m, the width is 2.434m, and the height is 1.355m. As shown in Figure 15, the performance of the body structure CAE analysis results are as follows:

Body bending stiffness of the improved model: 1.26×10 ⁷ N/m

Body bending stiffness of original model: 1.05×10 ⁷ N/m

Body skeleton mass of the improved model: 2703.27kg

Body skeleton mass of the original model: 2810.37kg

The above analysis results show that the keel offset method used in this application has a good matching effect on the stiffness of the left and right sides, the bending stiffness of the vehicle body is increased by 20%, and the mass of the vehicle body frame is also reduced by 107kg.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. one kind biases narrow keel bearing-type the Structure of Bus Body, it is characterised in that including：

Chassis leading portion；

Chassis back segment；

Chassis stage casing, it is located at the middle part of body understructure；And

The chassis stage casing is run through in keel, its axis side to the right along the chassis stage casing；

Truss is fixedly connected with right side truss by connecting cross beam on the left of keel；

Wherein, the spacing of the left side truss and the right side truss is 200mm~250mm, in the longitudinal direction of the left side truss The movable diagonal brace of Plane Installation, fixed diagonal brace is installed in the fore-and-aft plane of the right side truss, the keel are along chassis stage casing The deviation range of axis side to the right is 100mm~300mm, and the keel right side of the axis line skew along the chassis stage casing Truss is located in same fore-and-aft plane with truss structure on the right side of the keel of the chassis leading portion and the chassis back segment.

2. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 1, it is characterised in that in the chassis Section lower section is luggage compartment, and it is divided into the left and right sides by the keel；And

It is crew module above the body understructure.

3. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 1 or 2, it is characterised in that the left side Side truss and the right side truss respectively further comprise：Crew module's longitudinal floor beam, luggage compartment floor longeron and column；

Crew module's longitudinal floor beam is connected with the luggage compartment floor longeron by the column, the movable diagonal brace or Fixed diagonal brace is separately positioned between adjacent column.

4. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 3, it is characterised in that the luggage compartment Also include luggage compartment floor crossbeam, the crew module also includes crew module's floor crossmember and crew module floor connecting cross beam；

Wherein, in the left side truss and the right side truss both sides, and in the luggage compartment floor crossbeam and described V-type diagonal brace is respectively arranged between crew module's floor crossmember.

5. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 4, it is characterised in that in the chassis Connected between section and the crew module floor of the chassis leading portion and the crew module floor of the chassis back segment by V-type diagonal brace, And the top of the V-type diagonal brace is welded in crew module's floor crossmember, the side of the V-type diagonal brace is welded in the left side On truss, opposite side is welded in left-side.

6. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 5, it is characterised in that the luggage compartment Connected between floor and the chassis leading portion and the chassis back segment by V-type diagonal brace, and the top weldering of the V-type diagonal brace The luggage compartment floor crossbeam is connected to, the side of the V-type diagonal brace is welded on the left side truss, and opposite side is welded in left side Enclose.

7. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 1, it is characterised in that described movable Diagonal brace both ends are welded with connector, and it is fixedly connected by bolt with the connection sheet being welded on skeleton.

8. narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 2, it is characterised in that also include：Combustion Fuel tank, it is installed on the left of the keel of the luggage compartment between truss structure and keel right side truss structure.

A kind of 9. left and right sides Rigidity Matching method for biasing narrow keel bearing-type the Structure of Bus Body, it is characterised in that bag Include following steps：

Step 1: calculate vehicle body bending stiffness K；

Step 2: on the basis of body structure, truss and right side truss and axis on the left of the keel of scaled down chassis stage casing Relative distance between line, the keel left and right sides truss distance after distance reduces is L；

Step 3: the overall axis along chassis stage casing of keel side to the right is installed, offset or dish Y, vehicle body bending stiffness is K_Y；

Step 4: keel entirety is biased into extreme position, offset or dish Y to the right along the axis in chassis stage casing_max, and Calculate vehicle body bending stiffness K now_Ymax；

Step 5: keel entirety is moved into 0.05L to the left along the axis in chassis stage casing, now keel offset or dish isI.e.And calculate vehicle body bending stiffness

Step 6: work asWhen, it is overall overall to right-hand offset to the initial position before right-hand offset and keel in keel Multiple equidistant points are taken between extreme position afterwards, record vehicle body bending corresponding to keel offset or dish and the offset or dish respectively Rigidity, wherein offset or dish corresponding to maximum vehicle body bending stiffness is final offset or dish；

WhenWhen, offset or dish Y_maxAs final offset or dish.

10. the left and right sides Rigidity Matching method of narrow keel bearing-type the Structure of Bus Body is biased as claimed in claim 9, It is characterised in that it includes：The left side truss and the right side truss spacing are 200mm~250mm, and the keel are along the bottom The deviation range of frame stage casing axis side to the right is 100mm~300mm.