CN210391332U

CN210391332U - Automobile front floor

Info

Publication number: CN210391332U
Application number: CN201920825679.6U
Authority: CN
Inventors: 李华清; 张相坤; 蒋延国; 张延杰
Original assignee: Southeast Fujian Automobile Industry Co Ltd
Current assignee: Southeast Fujian Automobile Industry Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-04-24
Anticipated expiration: 2029-06-03

Abstract

An automobile front floor, comprising a central raised tunnel beam, the two sides of which are symmetrically designed noise reduction zones, the noise reduction zones comprising: the L-shaped convex structures are positioned at the rear ends of the L-shaped convex structures and close to the two sides of the tunnel beam, and the ring-shaped array square concave structures are positioned at the rear ends of the L-shaped convex structures and far away from the two sides of the tunnel beam; the L-shaped convex structure is in arc transition at a corner, and the whole reinforcement structure frames a rectangular opening; a circular opening is formed in the middle of the annular array square sunken structure; the annular array square recessed structures are provided with 5 square grooves which are symmetrically distributed along the central axis of the circular opening; the height of the front bulge of the tunnel beam is greater than the height of the rear bulge. The utility model discloses on the basis of comprehensive consideration performance, cost, technology, give the optimal design on preceding floor under the current structural framework, floor local rigidity before effectively increasing to the local mode of floor before promoting, and then floor vibration and structure radiation noise level before reducing promotes whole car NVH performance.

Description

Automobile front floor

Technical Field

The utility model belongs to the technical field of auto-parts's the manufacturing, concretely relates to floor before car.

Background

Along with the remarkable improvement of living standard of people, people have higher and higher requirements on the riding comfort of automobiles. In order to meet the requirements of customers and improve brand market competitiveness, automobile manufacturers continuously optimize the automobile body structure to achieve the best overall NVH performance on the premise of controlling the lowest design cost. The front floor of the automobile body directly influences the subjective feeling of passengers on the vibration noise of the automobile body, and the vibration noise transfer function of the front floor has great influence on the riding comfort of the automobile. The lack of rigidity of the front floor of the vehicle body easily causes the phenomena of vehicle body vibration and rumbling, so that the riding comfort of the whole vehicle is greatly reduced, and the subjective feeling of people is directly influenced.

The prior floor structure is generally designed according to the experience of engineering designers, and has a plurality of unreasonable places to cause insufficient rigidity of the floor, which easily causes the phenomena of shaking and rolling of the floor of a car body, and the floor is exposed until the adjustment and calibration of a sample car, so that the design cost is greatly improved and the product development period is prolonged.

Disclosure of Invention

The utility model aims to solve the technical problem that a floor before car that rigidity is strong, the noise is few is provided.

The utility model discloses a realize like this:

an automobile front floor, comprising a central raised tunnel beam, the two sides of which are symmetrically designed noise reduction zones, the noise reduction zones comprising: the L-shaped convex structures are positioned at the rear ends of the L-shaped convex structures and close to the two sides of the tunnel beam, and the ring-shaped array square concave structures are positioned at the rear ends of the L-shaped convex structures and far away from the two sides of the tunnel beam;

the L-shaped convex structure is in arc transition at a corner, and the whole convex structure frames a rectangular opening;

a circular opening is formed in the middle of the annular array square sunken structure; the annular array square recessed structures are provided with 5 square grooves which are symmetrically distributed along the central axis of the circular opening;

the height of the front bulge of the tunnel beam is greater than the height of the rear bulge.

Further, 6 zigzag recessed structures are transversely arrayed in the front of the tunnel beam and are transversely distributed along the tunnel beam.

Further, the noise reduction region further includes: the cross-shaped sunken sink groove structure is positioned in the middle part and far away from the two sides of the tunnel beam; sunken heavy groove structure of cross includes: the first sinking groove, the first cross-shaped recess and the round hole; the first cross-shaped recess is arranged in the whole first sinking groove, the cross-shaped cross part is the round hole, and the round hole is a process liquid leakage hole.

Further, the noise reduction region further includes: the cross-shaped sunken stepped counter bore structure is positioned at the front end and far away from the two sides of the tunnel beam; the cross-shaped sunken stepped counter bore structure comprises: a second sink groove, a second cross-shaped recess and two counter bores; the second sinking groove is a stepped sinking groove with two different sinking depths; the bottom of the second sink groove is provided with two counter bores; the second cross-shaped recess penetrates through the whole second sinking groove.

The utility model has the advantages that: engineering designers carry out structural design through morphology optimization analysis on the basis of design experience, and then provide a novel structure of the automobile front floor. On the basis of comprehensively considering performance, cost and process, the optimal design of the lower front floor of the existing structural frame is given, the local rigidity of the front floor is effectively increased, the local mode of the front floor is improved, the vibration and structural radiation noise level of the front floor is further reduced, and the NVH performance of the whole vehicle is improved.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a plan view of the present invention.

Fig. 3 is an analysis comparison diagram of the front floor of the automobile of the present invention and the existing front floor of the automobile.

Detailed Description

As shown in fig. 1 and 2, a front floor of an automobile is structurally embodied as follows: the middle part of the front floor body is greatly protruded to form a central tunnel beam 1, the local rigidity of the front floor is increased, six transverse array zigzag concave structures 2 are designed on the central tunnel beam 1 and are transversely arranged along the central tunnel beam 1. The central tunnel beam 1 has a large area, is prone to cause local modes, and is generally provided with an exhaust hook arranged below the central tunnel beam, and is prone to cause structural radiation noise due to vibration excitation transmitted from the exhaust hook. Therefore, the six-channel inverted V-shaped concave structure 2 is designed to be used as a reinforcing rib and extends from the top surface of the central tunnel beam 1 to the vertical surfaces of the two sides to the flat part of the front floor body, so that the local rigidity of the central tunnel beam 1 is effectively increased, the radiation noise of the sheet metal structure is reduced, and the vibration noise transmission path of the exhaust hook is improved. The protruding range of the front part of the central tunnel beam 1 obviously reaches more than 100mm, the protruding range of the front part extends backwards to the step space of two rows of passengers and quickly falls below 50mm, and other parts extend outwards flatly to two sides and are folded to be welded with the threshold beam. The central tunnel beam 1 is greatly raised to increase the rigidity of the floor, and the raised amplitude of the rear section is reduced to ensure that the stepping plane of two rows of passengers on the carpet is flat. The exhaust system hooks are generally installed under the central tunnel girder 1, so that vibration transmitted from the exhaust hooks can be effectively improved by increasing the rigidity of the tunnel girder.

L-shaped convex structures 3 are designed at the rear end of the front floor close to the two sides of the central tunnel beam 1 and are symmetrically distributed along the XOZ plane of the vehicle, so that the local rigidity of the front floor is increased, and the vibration and the structural radiation noise of the front floor are inhibited. The L-shaped convex structure 3 is in arc transition at the corner, the whole convex structure frames a rectangular opening 4, and the other two sides are respectively framed by the convex part of the tunnel beam 1 and the welding part of the rear end of the front floor and the upright metal plate, so that the local mode at the position is effectively improved, and the vibration and the structure radiation noise at the position caused by the excitation of a power assembly and road load are reduced.

The two sides of the rear end of the front floor far away from the central tunnel beam 1 are provided with annular array square recessed structures 5 which are symmetrically distributed along the XOZ plane of the vehicle, so that the local rigidity of the conical surface metal plate at the position is increased, and the local mode of the conical surface metal plate is improved. The annular array square concave structure 5 has five square concave parts on the conical surface and is symmetrically distributed around the central axis of the round hole 6. The odd square depressions are beneficial to inhibiting the symmetric mode, further improve the local rigidity and inhibit the vibration at the position.

In this embodiment, the cross-shaped sunken groove structures 7 are arranged on two sides of the middle of the front floor and symmetrically distributed along the XOZ plane of the vehicle, the cross-shaped sunken groove structures 7 penetrate through the whole sunken groove, and the cross-shaped cross part is provided with the process liquid leakage holes 8, so that the local rigidity of the part is increased, the local mode of the part is improved, and the local rigidity of the large-area metal plate surface of the part is improved. The metal plate has large area and is positioned below a row of seats, and if the rigidity is low, the metal plate is easy to be excited by a power assembly and road load to cause structural radiation noise. Therefore, through designing the sinking groove and designing the cross reinforcing rib penetrating through the sinking groove surface on the sinking groove surface, the local rigidity of the part is improved, and the radiation noise of the sheet metal structure at the part is reduced.

In the embodiment, the cross-shaped sunken stepped counter bore structures 9 are arranged on two sides of the front end of the front floor and are symmetrically distributed along the XOZ plane of the vehicle, so that the local rigidity of the metal plates at the pedal positions of one row of passengers is improved to reduce the vibration of the metal plates. The cross-shaped depressed stepped counter bore structure 9 has a large area and two openings 10 of a larger area. Therefore, a small-area sheet metal surface layer with different recess depths is formed by adopting a two-layer stamping structure, so that the local rigidity of the part is enhanced. In addition, the cross reinforcing ribs are arranged to penetrate through the two layers of stamping structures, and the local rigidity of the positions is further improved so as to reduce the vibration and the structural radiation noise of the positions.

The utility model discloses an engineering design personnel carries out structural design through appearance optimization analysis on the design experience basis, and then provides the novel structure on floor before the car of one kind. On the basis of comprehensively considering performance, cost and process, the optimal design of the lower front floor of the existing structural frame is given, the local rigidity of the front floor is effectively increased, the local mode of the front floor is improved, the vibration and structural radiation noise level of the front floor is further reduced, and the NVH performance of the whole vehicle is improved.

The utility model provides a novel forebay structure based on appearance optimization analysis can effectively solve because vibration, the rumble phenomenon that the forebay rigidity is not enough to arouse promotes the car by a wide margin and takes the travelling comfort.

Get the form and optimize and the floor after the standardization plays muscle model and further checks the floor vibration transfer function, contrast the former condition transfer function, the optimal effect is obvious, as shown in fig. 3, wherein the solid line represents before optimizing, the dotted line represents the utility model discloses. Compared with the original vibration transfer function, after optimization, the 77Hz peak value is reduced by 9.7 percent, the 111Hz peak value is shifted to 126Hz, the reduction is 44.1 percent, and the floor vibration peak value is obviously reduced.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.

Claims

1. The utility model provides a floor before car, includes the bellied tunnel roof beam in central authorities, the both sides of tunnel roof beam are the noise reduction zone of symmetry design, its characterized in that:

the noise reduction zone includes: the L-shaped convex structures are positioned at the rear ends of the L-shaped convex structures and close to the two sides of the tunnel beam, and the ring-shaped array square concave structures are positioned at the rear ends of the L-shaped convex structures and far away from the two sides of the tunnel beam;

2. The automotive front floor of claim 1, characterized in that: the tunnel beam front part is transversely arrayed with 6 zigzag recessed structures and transversely distributed along the tunnel beam.

3. The automotive front floor of claim 1, characterized in that: the noise reduction region further includes: the cross-shaped sunken sink groove structure is positioned in the middle part and far away from the two sides of the tunnel beam; sunken heavy groove structure of cross includes: the first sinking groove, the first cross-shaped recess and the round hole; the first cross-shaped recess is arranged in the whole first sinking groove, the cross-shaped cross part is the round hole, and the round hole is a process liquid leakage hole.

4. The automotive front floor of claim 1, characterized in that: the noise reduction region further includes: the cross-shaped sunken stepped counter bore structure is positioned at the front end and far away from the two sides of the tunnel beam; the cross-shaped sunken stepped counter bore structure comprises: a second sink groove, a second cross-shaped recess and two counter bores; the second sinking groove is a stepped sinking groove with two different sinking depths; the bottom of the second sink groove is provided with two counter bores; the second cross-shaped recess penetrates through the whole second sinking groove.