KR20120045099A - Cross section structure of side member for improving torsional behavior - Google Patents

Cross section structure of side member for improving torsional behavior Download PDF

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Publication number
KR20120045099A
KR20120045099A KR1020100106425A KR20100106425A KR20120045099A KR 20120045099 A KR20120045099 A KR 20120045099A KR 1020100106425 A KR1020100106425 A KR 1020100106425A KR 20100106425 A KR20100106425 A KR 20100106425A KR 20120045099 A KR20120045099 A KR 20120045099A
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KR
South Korea
Prior art keywords
cross
side member
sectional shape
sectional structure
sectional
Prior art date
Application number
KR1020100106425A
Other languages
Korean (ko)
Inventor
서영진
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020100106425A priority Critical patent/KR20120045099A/en
Publication of KR20120045099A publication Critical patent/KR20120045099A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/082—Engine compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D27/00—Connections between superstructure or understructure sub-units
    • B62D27/02—Connections between superstructure or understructure sub-units rigid

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The present invention relates to a side member cross-sectional structure, and more particularly, to connect the NO1 member and the NO2 member included in the cross member of the vehicle, the side member coupled to the vehicle body, the side to connect the NO1 member and the NO2 member The connecting portion formed in the front-rear direction of the member has a cross-sectional shape in which a portion of the lower side is open toward the lower side, and a portion of the upper side has a cross-sectional shape in which the upper part is opened upward, thereby maintaining the cross-sectional area of the NO1 member. By increasing the distance between the center and the centroid by improving the cross-sectional structure of the present invention relates to a side member cross-sectional structure that can improve the torsional behavior that can improve the resistance to torsion and bending behavior.

Description

Cross section structure of side member for improving torsional behavior

The present invention relates to a side member cross-sectional structure, and more particularly to a side member cross-sectional structure that can improve the torsional behavior.

The cross member coupled to the vehicle body to support the power train and prevent the transmission of vibration and noise comprises a side member, a NO1 member and a NO2 member, as shown in FIGS. 1A and 1B, which are applied to the cross member. Torsion and bending occur in the NO1 member due to load and resistance.

The twisting and bending of the NO1 member are the same for the aluminum crossmember of the composite method and the crossmember of the steel specification, which causes vibration and noise in the rear seat due to the twisting and bending behavior of the NO1 member. As shown in FIG. 1C, the side member of the cross member is manufactured by a casting method, and thus has one open side cross-sectional structure in one side of the side member, and thus becomes very vulnerable to torsion and bending behavior.

This torsional and bending behavior is different depending on the distance difference between the Shear Center and the Centroid, as shown in FIG. 1B, and in general, the greater the distance difference, the greater the resistance stiffness. In order to improve the torsional and bending behavior, it may be considered to increase the cross-sectional area of the NO 1 member, but due to the limitation of the layout, it is impossible to increase the rigidity due to the increase in the cross-sectional area.

An object of the present invention for solving the above problems is to improve the cross-sectional structure of the side member while maintaining the cross-sectional area of the NO1 member to increase the distance between the shear center and the centroid, thereby increasing the resistance to torsion and bending behavior It is to provide a cross-sectional structure of the side member that can be improved.

The configuration of the present invention for achieving the above object, in the side member coupled to the NO1 member and NO2 member included in the cross member of the vehicle, coupled to the vehicle body, the side member to connect the NO1 member and NO2 member The connecting portion formed in the front-back direction of has a cross-sectional shape in which a portion of the lower side is open toward the bottom, and a cross-sectional shape in which a portion of the upper side is open toward the top.

In addition, the side member, the lower side adjacent to the NO1 member and the lower side adjacent to the NO2 member is open, it is preferable to have a cross-sectional shape in which the lower side of both ends of the connecting portion is opened toward the bottom, the connecting portion It is preferable that the upper side of the center has a cross-sectional shape that is open toward the top.

In addition, the side member is made of aluminum, it is more preferably produced by a casting method.

The effect of the present invention having the configuration as described above, by forming the center of the connection portion of the side member has an open cross-sectional shape toward the top, compared to the cross-sectional shape of the side member used in the prior art Shear Center (Shear Center) and centroid Since the interval between (Centroid) can be made larger, the torsion and bending rigidity of the NO1 member can be improved, thereby improving crossmember durability and NVH performance without increasing the cross-sectional area.

Figures 1a to 1c is a view showing a cross member conventionally used.
Figure 2 is a perspective view showing a side member according to the present invention.
3A to 3C are cross-sectional views showing cross-sections of side members cut along AA, BB and CC of FIG. 2;
Figure 4 is a graph showing the bending stiffness of the NO1 member according to the distance difference between the Shear Center and Centroid.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view showing a cross-sectional structure of the side member 10 for improving the torsional behavior of the present invention.

The present invention connects the NO1 member 20 and the NO2 member 30 included in the cross member of the vehicle, and in the side member 10 coupled to the vehicle body, the NO1 member 20 and the NO2 member 30. The connecting portion 11 formed in the front-rear direction of the side member 10 for connecting the lower portion has a cross-sectional shape opened toward the lower side, and the upper portion of the side surface has a cross-sectional shape opened toward the upper side do.

That is, the side member used in the prior art, as shown in Figure 1b, the upper side is completely connected to each other structure is not open and the lower side is formed to have a shape such as '┏┳┳┓' is completely open toward the lower side .

Accordingly, the distance d between the shear center located at the upper side of the side member and the centroid positioned at the center of the side member is small, and thus the shear force transmitted to the side member is reduced. The torsional and bending resistance stiffness is small, which lowers the torsional behavior of the vehicle.

In order to solve this problem, in the present invention, the cross section of the connection part 11 of the side member 10 is formed to be inverted, so that a gap between the shear center and the centroid is formed to be larger, and thus, torsional resistance The stiffness was increased to achieve the damping effect of vibration and noise.

In the connecting portion 11 connecting the NO1 member 20 and the NO2 member 30, upper and lower surfaces thereof are opened differently according to the lengths of the front and rear directions thereof, as shown in FIG. 2. The lower side adjacent to the member 20 and the lower side adjacent to the NO2 member 30 are opened to form a cross-sectional shape in which the lower side of both ends of the connecting portion 11 is opened downward, and the connecting portion 11 It is preferable that the center upper surface is made into the cross-sectional shape opened toward the upper side.

That is, the lower side of the connecting portion 11 is open at both ends and the center is closed, the upper side of the connecting portion 11 is formed so that both ends are closed and the center is open.

Accordingly, the cross-sectional shape of both ends of the connecting portion 11 is formed in the same shape as the side members used in the prior art, as shown in Figure 3a and 3c has a shape such as '┏┳┳┓' which is open toward the bottom. In addition, the cross-sectional shape of the center of the connecting portion 11 has a shape such as '┗┻┻┛' that is open toward the top as shown in Figure 3b.

Thus, by forming the center cross-sectional shape of the side member 10, the connecting portion 11 to open upward, the distance (d) difference between the shear center and the centroid can be made the largest, so it can be seen in the graph of FIG. As can be seen, the torsional and stiffness resistances that follow are relatively the largest, so that the bending mode of the NO1 member 20 is improved by about 29 Hz from 143 Hz to 172 Hz, thereby reducing the rear-wall vibration and noise problems such as MASS dampers. It can be solved with the crossmember's own structure without additional installation.

In addition, in a situation where it is impossible to increase the cross-sectional area of the NO1 member 20 due to vehicle layout constraints, the torsional and bending rigidity of the NO1 member 20 may be increased by improving the cross-sectional structure of the side member 10. It is useful to maintain stability, and it is more excellent in reducing the sound quality of rear seat when applied to aluminum cross member manufactured by composite method.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

10: side member 11: the connection portion
20: NO1 member 30: NO2 member

Claims (4)

In the side member 10 that connects the NO1 member 20 and the NO2 member 30 included in the cross member of the vehicle, and coupled to the vehicle body,
The connecting portion 11 formed in the front-rear direction of the side member 10 connecting the NO1 member 20 and the NO2 member 30 has a cross-sectional shape in which a portion of the lower side is opened downward, and a portion of the upper side is Side member cross-sectional structure for improving the torsional behavior, characterized in that it has a cross-sectional shape open toward the top.
The method of claim 1,
The side member 10 has a lower side adjacent to the NO1 member 20 and a lower side adjacent to the NO2 member 30 to be opened so that lower side surfaces of both ends of the connection part 11 open downward. Side member cross-sectional structure for improving the torsional behavior, characterized in that the cross-sectional shape.
The method of claim 1,
The side member 10, the cross-sectional structure of the side member for improving the torsional behavior, characterized in that the upper side of the center of the connection portion 11 is formed in a cross-sectional shape open toward the top.
The method of claim 1,
The side member 10 is made of an aluminum material, side member cross-sectional structure for improving the torsional behavior, characterized in that produced by the casting method.

KR1020100106425A 2010-10-29 2010-10-29 Cross section structure of side member for improving torsional behavior KR20120045099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100106425A KR20120045099A (en) 2010-10-29 2010-10-29 Cross section structure of side member for improving torsional behavior

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100106425A KR20120045099A (en) 2010-10-29 2010-10-29 Cross section structure of side member for improving torsional behavior

Publications (1)

Publication Number Publication Date
KR20120045099A true KR20120045099A (en) 2012-05-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100106425A KR20120045099A (en) 2010-10-29 2010-10-29 Cross section structure of side member for improving torsional behavior

Country Status (1)

Country Link
KR (1) KR20120045099A (en)

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