CN212447523U

CN212447523U - Multi-material composite motor train unit body bearing structure

Info

Publication number: CN212447523U
Application number: CN202021149848.8U
Authority: CN
Inventors: 于庆斌; 尹华; 何玲利; 周伟旭
Original assignee: CRRC Changchun Railway Vehicles Co Ltd
Current assignee: CRRC Changchun Railway Vehicles Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-02-02
Anticipated expiration: 2030-06-19

Abstract

A multi-material composite motor train unit body bearing structure comprises a metal frame, a composite underframe unit, a composite side wall unit and a composite roof unit; the metal frame comprises an underframe, side walls, a roof and end walls, wherein mounting openings are respectively formed in weak strength-required parts of the underframe, the side walls and the roof, a composite underframe unit is connected to the mounting openings of the underframe, a composite side wall unit is connected to the mounting openings of the side walls, and a composite roof unit is connected to the mounting openings of the roof; the composite underframe unit, the composite side wall unit and the composite roof unit are all carbon fiber composite frame structures with a plurality of cavities inside, and the carbon fiber composite frames are filled with sound-proof and heat-insulating layers and reinforced foams or honeycomb structures. Under the condition of ensuring that the strength standard of the vehicle body and the requirements of related equipment interfaces are not changed, the weight of the vehicle body is reduced by more than 20% compared with that of an aluminum alloy vehicle body with the same size, and the light weight is realized.

Description

Multi-material composite motor train unit body bearing structure

Technical Field

The utility model belongs to the technical field of the track traffic, concretely relates to compound EMUs automobile body bearing structure of multiple material.

Background

At present, domestic and domestic high-speed motor train units are basically cylindrical integral bearing structures formed by assembling and welding long and large hollow aluminum alloy sections, and the weight of a motor train body accounts for about one fifth of the weight of the whole motor train unit. With the continuous improvement of the requirement of the motor train unit on the lightweight degree, the lightweight research of the car body structure also becomes a heavy task, but the aluminum alloy car body structure is influenced and limited by factors such as main materials, design structures and the like, the weight reduction becomes a bottleneck, the lightweight research is extremely difficult to develop, and the feasibility is basically unavailable. Research personnel have analyzed and researched the stress condition and the load distribution rule of the current vehicle body, and researches are carried out on the vehicle body structure and materials, and the current vehicle body structure and materials are analyzed and found that the current vehicle body structure and materials cannot meet the lightweight index of reducing the weight of the vehicle body by 20% under the premise that the strength standard is unchanged and the aerodynamic load is increased from +/-6000 Pa to +/-7000 Pa, and the fundamental problem of great weight reduction cannot be solved even by advanced calculation and analysis methods such as topology optimization. For the car body structure, the light weight is generally realized by adopting a new material and a new technology, wherein the quality of the car body can be greatly reduced by adopting the car body structure adopting the new material, but the car body structure has higher risk as an important bearing part of the motor train unit due to high cost, complex structure and imperfect rail transit application technology, and has great influence on the installation of under-car equipment of the whole car and the car body manufacturing process. Therefore, the research on new lightweight vehicle body structures is a very urgent task for the current development of vehicle body technology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound EMUs automobile body bearing structure of multiple material guarantees under the unchangeable condition of vehicle equipment fixing position and function, automobile body intensity standard and relevant equipment interface requirement, subtracts current high-speed EMUs automobile body and weighs more than 20%, realizes the lightweight.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

a multi-material composite motor train unit body bearing structure comprises a metal frame, a composite underframe unit, a composite side wall unit and a composite roof unit; the metal frame comprises an underframe, side walls, a roof and end walls, wherein mounting openings are respectively formed in weak strength-required parts of the underframe, the side walls and the roof, a composite underframe unit is connected to the mounting openings of the underframe, a composite side wall unit is connected to the mounting openings of the side walls, and a composite roof unit is connected to the mounting openings of the roof; the composite bottom frame unit, the composite side wall unit and the composite roof unit are all carbon fiber composite frame structures with a plurality of cavities inside, the carbon fiber composite frame is filled with a sound insulation and heat insulation layer and reinforced foam or a honeycomb structure, the sound insulation and heat insulation layers are arranged on the upper side and the lower side of the reinforced foam or the honeycomb structure and are clamped between the reinforced foam or the honeycomb structure and the carbon fiber composite frame.

The composite underframe unit, the composite side wall unit and the composite roof unit are in tenon joint connection with respective installation openings longitudinally, and are in lap joint with riveting and gluing in a transverse mode.

The upper edge beam and the lower edge beam at the longitudinal joint of the installation opening on the metal frame are correspondingly provided with installation grooves which are alternated horizontally and longitudinally, and the longitudinal connecting ends of the composite underframe unit, the composite side wall unit and the composite roof unit are processed with tenon joint structures connected with the installation grooves.

The composite roof frame is characterized in that a first mounting hole is processed in a lower boundary beam at the transverse connection position of a mounting opening in the metal frame, a second mounting hole is formed in the carbon fiber composite frame, the first mounting hole and the second mounting hole are arranged oppositely, and transverse connection ends of the composite underframe unit, the composite side wall unit and the composite roof unit are lapped on the lower boundary beam of the metal frame, are bonded with a contact surface of the lower boundary beam and penetrate through the first mounting hole and the second mounting hole through rivets to be fixed.

The utility model has the advantages and beneficial effect:

(1) the utility model discloses guaranteeing that vehicle equipment fixing position and function are unchangeable, the intensity standard that the automobile body was carried out is unchangeable and guarantee under the unchangeable prerequisite of the relevant interface requirement of automobile body, furthest reduces automobile body weight, through the estimation, the automobile body structure that adopts the design of this application design method has reduced about more than 20% than the aluminum alloy automobile body structure weight of equidimension.

(2) The utility model discloses at present still belong to the initiative in the internal structure design at home and abroad, current internal structure design thinking is broken through to this kind of design form, the constitution of replanning the internal structure, the intensity of automobile body has fully been considered, rigidity and gas tightness requirement, the equipment hoist and mount has highly integrated, pipeline passageway, sound insulation and heat insulation isotructure, under the condition that does not change the external profile shape of automobile body and interface mode, through at the inside integrated combined material structure of automobile body metal framework, change the mode that frame-type bearing structure and combined together with the whole bearing structure of automobile body bearing mode by simple cylindric, furthest reduces automobile body quality.

(3) The utility model discloses using in EMUs automobile body design, through calculating, the density of combined material structure is about 1.6g/cm³The weight of the car body adopting the composite material structure is about 9 tons, which is reduced by about 23 percent compared with the full aluminum alloy car body structure with the same size and the weight of 11.7 tons, and the light weight index requirement of reducing the weight of the car body by 20 percent is met; with the continuous development and progress of the material technology and the structure optimization technology, the quality of the vehicle body designed by the utility model can be further reduced; and the vehicle body is deeply optimized by methods such as topology optimization and the like, so that the quality of the vehicle body is further reduced.

Drawings

FIG. 1 is an axial schematic view of a multi-material composite motor train unit body;

FIG. 2 is a schematic structural view of a metal frame;

FIG. 3 is a cross-sectional view of a multi-material composite motor train unit body structure;

FIG. 4 is a schematic view of a transverse cross-section of the composite roof unit and a longitudinal connection to the mounting opening;

FIG. 5 is a schematic view of a longitudinal groove and a transverse groove at the longitudinal connection of the installation gap on the metal frame;

fig. 6 is a schematic view of a longitudinal cross section of the composite roof unit and a transverse connection to the mounting break.

In the figure: the composite structure comprises a metal frame 1, a composite underframe unit 2, a composite side wall unit 3, a composite roof unit 4, an installation notch 5, a carbon fiber composite frame 6, a sound and heat insulation layer 7, a honeycomb structure 8, a longitudinal groove 9, a transverse groove 10, a first installation hole 11, a second installation hole 12, a rivet 13, a front end wall 101, a rear end wall 102, an underframe 103, a roof 104, a left side wall 105 and a right side wall 106.

Detailed Description

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments.

In this application, it is to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1 to 6, the utility model provides a multiple material composite motor train unit body bearing structure, including a metal (aluminum alloy) frame 1, a composite bottom frame unit 2, a composite side wall unit 3, and a composite roof unit 4; the metal frame 1 comprises a front end wall 101, a rear end wall 102, a bottom frame 103, a roof 104, a left side wall 105 and a right side wall 106; the front end wall 101, the rear end wall 102, the chassis 103, the roof 104, the left side wall 105 and the right side wall 106 can be fixedly connected in a welding mode; mounting notches 5 are respectively formed in the parts, with relatively weak strength requirements, of the underframe 103, the roof 104, the left side wall 105 and the right side wall 106, so that the metal frame 1 can well transfer force, the strength of the vehicle body is increased, and the rigidity and the mode of the vehicle body are improved;

a composite underframe unit 2 is connected to the mounting opening 5 of the underframe 103, a composite side wall unit 3 is connected to the mounting openings 5 of the left side wall 105 and the right side wall 106, and a composite roof unit 4 is connected to the mounting opening 5 of the roof 104;

the composite underframe unit 2, the composite side wall unit 3 and the composite roof unit 4 are all carbon fiber composite frame structures with a plurality of cavities inside, a sound-proof and heat-insulating layer 7 and a honeycomb structure 8 are filled in the carbon fiber composite frame 6, and the sound-proof and heat-insulating layer 7 is arranged on the upper side and the lower side of the honeycomb structure 8 and is clamped between the honeycomb structure 8 and the carbon fiber composite frame 6; the composite underframe unit 2, the composite side wall unit 3 and the composite roof unit 4 are hollow structures compounded by carbon fiber composite materials, sound-proof and heat-insulating layers and honeycomb structures by adopting an internal pressure hollow integrated forming process, the structure not only considers the integral strength and rigidity of the composite materials, but also integrates the structures of equipment hoisting, pipeline passing space, sound and heat insulation and the like, the comprehensive performance of the composite material structure is greatly improved, and the weight of the whole vehicle is further reduced.

In addition, the sound insulation layer 7 and the honeycomb structure 8 can be selectively filled in the cavity of the carbon fiber composite frame 6 according to the requirements of the vehicle body, the honeycomb structure 8 can not be filled in the part with low strength requirement, and the cavity structure of the carbon fiber composite frame 6 is reserved; the sound-proof and heat-insulation layer 7 is not required to be arranged at the position with low requirements on sound and heat insulation; but the honeycomb structure 8 can also be replaced by other lightweight high-strength structures such as reinforced foam.

In this application the effective connection of composite chassis unit 2, composite side wall unit 3, composite roof unit 4 and metal frame 1 can play an important role to the whole bearing structure of automobile body, both need the effective transmission of assurance power, will satisfy the vehicle gas tightness requirement again. According to the structural characteristics of the composite underframe unit 2, the composite side wall unit 3 and the composite roof unit 4, different connection modes are respectively selected according to the longitudinal direction and the transverse direction of the stressed working condition of the vehicle body by applying the factors such as the load condition, the application environment and the like;

the composite underframe unit 2, the composite side wall unit 3 and the composite roof unit 4 are longitudinally in tenon joint connection with the respective installation openings 5; mounting grooves are correspondingly formed in the upper edge beam and the lower edge beam at the longitudinal connection position of the mounting opening 5 on the metal frame, each mounting groove comprises a longitudinal groove 9 and a transverse groove 10 which are alternated transversely and longitudinally, a joggle structure connected with the mounting groove is processed at the longitudinal connection end of the composite underframe unit 2, the composite side wall unit 3, the composite roof unit 4 and the mounting opening 5, the joggle structure is formed by adopting an internal pressure hollow integrated forming process, the joggle structure is arranged in the longitudinal grooves 9 and the transverse grooves 10, transverse positioning is limited by the longitudinal grooves, transverse force is transmitted, longitudinal positioning is limited by the transverse grooves, and longitudinal force is transmitted; in addition, in order to ensure the air tightness of the vehicle body, the longitudinal joints of the composite underframe unit 2, the composite side wall unit 3, the composite roof unit 4 and the installation notch 5 on the metal frame 1 are sealed by glue;

the composite underframe unit 2, the composite side wall unit 3, the composite roof unit 4 and the respective installation gaps 5 are transversely overlapped in a riveting and gluing combined mode; the composite frame is characterized in that a first mounting hole 11 is processed on a lower boundary beam at the transverse connection position of a mounting notch 5 on the metal frame 1, a second mounting hole 12 is formed in the carbon fiber composite frame, the first mounting hole 11 and the second mounting hole 12 are arranged oppositely, transverse connection ends of the composite underframe unit 2, the composite side wall unit 3 and the composite roof unit 4 are lapped on the lower boundary beam of the metal frame and are bonded with a contact surface of the lower boundary beam to guarantee air tightness, then a rivet 13 penetrates through the first mounting hole 11 and the second mounting hole 12 and is fixedly connected through the rivet 13, and effective transmission of force is guaranteed through the connection mode, and the requirement on tightness is also guaranteed.

Claims

1. The utility model provides a compound EMUs automobile body bearing structure of multiple material which characterized in that: the composite roof structure comprises a metal frame, a composite bottom frame unit, a composite side wall unit and a composite roof unit; the metal frame comprises an underframe, side walls, a roof and end walls, wherein mounting openings are respectively formed in weak strength-required parts of the underframe, the side walls and the roof, a composite underframe unit is connected to the mounting openings of the underframe, a composite side wall unit is connected to the mounting openings of the side walls, and a composite roof unit is connected to the mounting openings of the roof; the composite bottom frame unit, the composite side wall unit and the composite roof unit are all carbon fiber composite frame structures with a plurality of cavities inside, the carbon fiber composite frame is filled with a sound insulation and heat insulation layer and reinforced foam or a honeycomb structure, the sound insulation and heat insulation layers are arranged on the upper side and the lower side of the reinforced foam or the honeycomb structure and are clamped between the reinforced foam or the honeycomb structure and the carbon fiber composite frame.

2. The multiple material composite motor train unit body bearing structure of claim 1, wherein: the composite underframe unit, the composite side wall unit and the composite roof unit are in tenon joint connection with the installation openings on the respective metal frames longitudinally, and are in lap joint with riveting and gluing transversely.

3. The multiple material composite motor train unit body bearing structure of claim 2, wherein: the upper edge beam and the lower edge beam at the longitudinal joint of the installation opening on the metal frame are correspondingly provided with installation grooves which are alternated horizontally and longitudinally, and the longitudinal connecting ends of the composite underframe unit, the composite side wall unit and the composite roof unit are processed with tenon joint structures connected with the installation grooves.

4. The multiple material composite motor train unit body bearing structure of claim 2, wherein: the composite roof frame is characterized in that a first mounting hole is processed in a lower boundary beam at the transverse connection position of a mounting opening in the metal frame, a second mounting hole is formed in the carbon fiber composite frame, the first mounting hole and the second mounting hole are arranged oppositely, and transverse connection ends of the composite underframe unit, the composite side wall unit and the composite roof unit are lapped on the lower boundary beam of the metal frame, are bonded with a contact surface of the lower boundary beam and penetrate through the first mounting hole and the second mounting hole through rivets to be fixed.