CN110816666B

CN110816666B - Auxiliary frame

Info

Publication number: CN110816666B
Application number: CN201810904427.2A
Authority: CN
Inventors: 万磊; 赤川大治; 实吉勇一郎; 缪杰锋
Original assignee: Honda Technology Research Industry China Investment Co ltd
Current assignee: Honda Technology Research Industry China Investment Co ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2021-02-19
Anticipated expiration: 2038-08-09
Also published as: CN110816666A

Abstract

The invention provides a subframe capable of reducing manufacturing cost. The subframe comprises a subframe body (1) and a damping structure (2), wherein the damping structure (2) comprises a damping support (21) and a support (22), the damping support (21) integrally extends in the left-right direction, is configured in a state of standing from the upper surface of the subframe body (1), and is fixed on the upper surface of the subframe body (1). The support bracket (22) is fixed to the upper surface of the subframe body, and is connected to the damper bracket (21) to form a closed annular shape with the damper bracket (21) in a plan view.

Description

Auxiliary frame

Technical Field

The invention relates to an auxiliary frame with a vibration damping structure.

Background

In the driving process of the automobile, the resonance abnormal sound peak value generated by the auxiliary frame is higher due to the high-speed running of the engine, and the problem can be better solved by adding the vibration damping structure on the auxiliary frame. For example, patent document 1 below discloses a subframe with a vibration absorber (vibration damping structure) for suppressing vibration of the subframe by disposing a mass block on the subframe, the mass block being attached to the subframe by a bracket having a top plate and left and right risers.

The vibration damping structure of the subframe has the following problems: that is, since the vibration absorber includes the mass block and the bracket, when mounting, it is necessary to mount the bracket on the subframe as well as the mass block on the bracket, which increases the number of processes and increases the cost.

Patent document 1: CN206734401U

Disclosure of Invention

In view of the above, an object of the present invention is to provide a subframe capable of reducing manufacturing costs.

In order to achieve the above object, a subframe according to the present invention includes a subframe main body and a vibration damping structure, the vibration damping structure including a vibration damping bracket extending in a left-right direction as a whole and disposed in a state of standing from an upper surface of the subframe main body, the vibration damping bracket being fixed to the upper surface of the subframe main body.

Because the vibration damping support is fixed on the upper surface of the auxiliary frame body, the vibration damping support is erected on the upper surface of the auxiliary frame body and extends along the left-right direction, and the lower end edge is attached to the upper surface of the auxiliary frame body, so that the rigidity of the auxiliary frame is improved, the vibration of the auxiliary frame body can be inhibited, and the noise is reduced. Namely, the invention can reduce noise only by the vibration reduction bracket without arranging a mass block, has simple structure and less installation procedures, reduces the installation difficulty and reduces the production cost.

Further, since it is not necessary to use a mass as in the conventional technique and it is not necessary to provide a large arrangement space in the vertical direction to arrange the mass, the height of the vibration damping structure in the vertical direction can be reduced and interference with other members can be avoided.

In the present invention, it is preferable that an accommodating portion which is upwardly protruded is provided at a central portion of the subframe body, and the vibration damping bracket is fixed to the accommodating portion.

Because the accommodating part is used for accommodating the suspension system, and the suspension system is connected with the engine, the resonant abnormal sound peak generated by the accommodating part is highest, and the vibration damping support is arranged on the accommodating part, so that the vibration of the accommodating part can be effectively inhibited, the resonant abnormal sound peak generated by the accommodating part is reduced, the noise transmitted from the auxiliary frame to the cab is reduced, and the NVH performance of the automobile is improved.

In the present invention, preferably, the housing portion has a top wall portion and side wall portions extending downward from both left and right ends of the top wall portion,

the damper bracket is fixed to the top wall portion and the side wall portion across a corner portion between the top wall portion and the side wall portion.

With the structure, the vibration damping bracket is fixed on the top wall part and the side wall part extending downwards of the accommodating part, so that the vibration of the accommodating part can be effectively inhibited, the noise and the resonance generated by the accommodating part are reduced, the noise transmitted from the auxiliary frame to the cab is reduced, and the NVH performance of the automobile is improved.

Preferably, the damping bracket is provided with a protruding part protruding in a direction away from the vertical surface of the damping bracket.

By adopting the structure, the strength of the vibration damping support can be enhanced by the protruding part, the vibration damping effect of the vibration damping support is improved, and in addition, the vibration damping support can be prevented from interfering with other components.

Preferably, the vibration damping structure further comprises a support bracket, and the support bracket is fixed to the upper surface of the subframe body and connected with the vibration damping bracket.

By adopting the structure, the supporting bracket for supporting the vibration damping bracket is arranged, so that the vibration damping bracket can be better fixed, and the vibration damping effect of the vibration damping bracket is enhanced.

Preferably, the support bracket and the vibration reduction bracket are connected to form a closed annular shape.

By adopting the structure, the supporting bracket is connected with the vibration damping bracket to form a closed annular shape, so that the supporting bracket can better support and fix the vibration damping bracket, the vibration damping effect of the vibration damping bracket is improved, the noise generated by the auxiliary frame body is reduced, and the NVH performance of an automobile is improved.

In the present invention, preferably, the vibration damping support is provided with a base portion, both ends of the base portion are provided with extension portions, the support and the base portion are connected to form an annular polygon, and the extension portions are located on the outer side of the annular polygon.

By adopting the structure, the support bracket is connected with the base part to form the annular polygon, so that the vibration reduction bracket can be more effectively fixed on the accommodating part, the deformation of the vibration reduction bracket caused by the vibration of the accommodating part is prevented, the strength of the vibration reduction bracket is weakened, and the vibration reduction effect of the vibration reduction bracket is reduced.

In the present invention, preferably, the support bracket is a U-shaped bracket, an opening of the U-shaped bracket is connected to the base, and the U-shaped bracket is fixed to a receiving portion provided in the subframe body.

Adopt as above structure, U-shaped support simple structure, the production degree of difficulty is low, and the U-shaped support is fixed on the portion of holding, and the space that occupies is little, and is high little in the upper and lower side, not only can avoid producing with other parts and interfere, can effectively restrain the vibration of portion of holding moreover, improves the damping effect of damping structure, improves the NVH performance of car.

Drawings

Fig. 1 is a perspective view of the entire subframe with a vibration damping structure according to the present embodiment;

FIG. 2 is a top view of the subframe;

FIG. 3 is a front view of the subframe;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a view from the right side in FIG. 4;

FIG. 6 is a perspective view of the subframe with the shock absorbing structure removed, as viewed from the top left front;

FIG. 7 is a perspective view of the subframe with the shock absorbing structure removed, as viewed from generally the front;

fig. 8 is a perspective view of the vibration damping structure viewed from the front left upper side;

FIG. 9 is a side view of a vibration dampening structure;

fig. 10 is a perspective view of the vibration damping structure viewed from substantially the upper left;

FIG. 11 is a top view of a vibration dampening structure;

FIG. 12 is a front view of a vibration damping structure;

fig. 13 shows the results of the vibration noise detection experiments performed in examples 1 and 2 and comparative example.

Description of the reference numerals

100. An auxiliary frame; 1. a subframe body; 11. an accommodating portion; 111. a top wall portion; 112. a sidewall portion; 113. a rear wall portion; 2. a vibration reduction structure; 21. a vibration damping support; 210. a base; 211. a protrusion; 212. an extension portion; 22. a support bracket; 221. a rear wall portion; 222. a sidewall portion.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Fig. 1 is a perspective view of the entire subframe with a vibration damping structure according to the present embodiment; FIG. 2 is a top view of the subframe; FIG. 3 is a front view of the subframe; FIG. 4 is an enlarged view of a portion of FIG. 3; FIG. 5 is a view from the right side in FIG. 4; FIG. 6 is a perspective view of the subframe with the shock absorbing structure removed, as viewed from the top left front; FIG. 7 is a perspective view of the subframe with the shock absorbing structure removed, as viewed from generally the front; fig. 8 is a perspective view of the vibration damping structure viewed from the front left upper side; FIG. 9 is a side view of a vibration dampening structure; fig. 10 is a perspective view of the vibration damping structure viewed from substantially the upper left; FIG. 11 is a top view of a vibration dampening structure; fig. 12 is a front view of the vibration damping structure. In the following description, front, rear, left, right, up, and down directions are used, and these directions are defined with reference to the vehicle body, and are also indicated in fig. 1 and 2. The direction used in the description of each component is a direction in the mounted state unless otherwise specified.

As shown in fig. 1 and 2, the subframe 100 of the present embodiment includes a subframe body 1 and a vibration damping structure 2. An engine (not shown) is connected to the subframe 100 and a vehicle body (not shown) via a suspension system (not shown). The subframe body 1 is formed to have a long left-right dimension (compared to the front-rear dimension) as a whole, and a housing portion 11 for mounting a suspension system is provided in a left-right center portion thereof, and the vibration damping structure 2 is mounted in the housing portion 11.

As shown in fig. 6 and 7, the accommodating portion 11 is formed in an upwardly convex bulge shape, and has a top wall portion 111 and a pair of side wall portions 112 as viewed from the front, the top wall portion 111 extending substantially horizontally as a whole, and the pair of side wall portions 112 extending obliquely downward from both left and right ends of the top wall portion 111 toward the left and right outer sides. As shown in fig. 3 to 5, the vibration damping structure 2 is fixed to the upper surface of the accommodating portion 11, specifically, the upper surfaces of the top wall portion 111 and the pair of side wall portions 112.

As shown in fig. 4 and 5, the accommodating portion 11 further has a rear wall portion 113 extending downward from the rear portion of the top wall portion 111 toward the front and rear outer sides, and as shown in fig. 6 and 7, the front side of the accommodating portion 11 is open. Since the subframe body 1 and the accommodating portion 11 may have a known structure, a more detailed description thereof will be omitted in this specification.

As shown in fig. 8 to 11, the vibration damping structure 2 has a vibration damping bracket 21, and preferably, the vibration damping bracket 21 is stamped from a metal plate material.

As shown in fig. 4 and 8, the damper bracket 21 extends generally in the left-right direction as a whole, and the damper bracket 21 is engaged and fixed to the upper surfaces of the top wall portion 111 and the side wall portion 112 across the corner portion between the top wall portion 111 and the side wall portion 112 of the accommodating portion 11. The vibration damping bracket 21 has a base portion 210 and extension portions 212 provided at both ends of the base portion 210. A protrusion 211 protruding forward is formed in the center of the damper bracket 21, and the protrusion 211 includes a front wall 2111 extending substantially in the left-right direction and side walls 2112 extending rearward from both left and right ends of the front wall 2111 and connected to the base 210. By providing such a protrusion 211, on the one hand, the strength of the damper bracket 21 can be increased by the shape change of the protrusion 211, and the damping effect can be improved, and on the other hand, interference between the damper bracket 21 and another member (for example, a bolt on the housing 11) can be avoided. In the present embodiment, one protrusion 211 is provided and protrudes forward, however, the number and protruding direction of the protrusions 211 are not particularly limited.

As shown in fig. 4 and 8, in the present embodiment, the damper structure 2 further includes a support bracket 22 connected to the damper bracket 21, the support bracket 22 has a U-shape with an opening facing forward in a plan view, and is welded and fixed to the damper bracket 21 from behind, and both of them form a closed ring structure. The lower end edges of the damper bracket 21 and the support bracket 22 are fitted (shape-fitted) and welded to the upper surface of the accommodating portion 11 of the subframe body 1, and the plate surface directions thereof are perpendicular to the upper surface of the accommodating portion 11 of the subframe body 1 (the upper surfaces of the top wall portion 111 and the side wall portion 112).

In the present embodiment, the support bracket 22 has a U-letter shape, however, the present invention is not limited thereto, and two support brackets may be provided at the middle of the vibration damping bracket 21, or two support plates may be connected to each other.

Referring to fig. 4, the base portion 210 of the damper bracket 21 has extending portions 212 extending downward at both left and right ends. The support frame 22 is connected with the base portion 210 to form a closed annular polygon, and the extension portion 212 is located outside the annular polygon.

In the present embodiment, the subframe 100 includes the damper structure 2, the damper structure 2 includes the damper bracket 21, and the damper bracket 21 is formed of a plate material, extends in the left-right direction as a whole, is disposed in a standing state from the upper surface of the subframe body 1 (the upper surface of the accommodating portion 11), and has a lower end edge attached and fixed to the upper surface of the subframe body 1. Therefore, the vibration of the subframe body 1 can be suppressed by the damper bracket 21, and the noise generated from the subframe body 1 can be reduced. Moreover, since the vibration reduction bracket 21 can reduce noise, it is not necessary to provide a mass block as in the prior art, which can reduce production cost and simplify the mounting process.

Further, since it is not necessary to use a mass as in the conventional technique and it is not necessary to provide a large arrangement space in the vertical direction to arrange the mass, the height of the vibration damping structure in the vertical direction can be reduced and interference with other members can be avoided. Further, the vibration damping structure 2 of the present embodiment can avoid interference with other members above even when attached to the upwardly raised accommodating portion 11.

In addition, according to the present embodiment, the vibration damping structure 2 further includes a support bracket 22, and the support bracket 22 is fixed to the upper surface of the subframe body 1, and is connected to the vibration damping bracket 21 so as to form a closed annular shape in plan view. Therefore, the support bracket can support the vibration reduction bracket, the stability of the vibration reduction bracket is improved, and the vibration reduction effect of the vibration reduction bracket is enhanced.

As shown in fig. 8 to 11, the support bracket 22 includes a rear wall portion 221 extending substantially in the left-right direction and side wall portions 222 extending forward from both left and right ends of the rear wall portion 221, and the front end edges of the side wall portions 222 are welded and fixed to the rear surface of the base portion 210 of the damper bracket 21. The included angle between the side wall 222 and the extending portion 212 is an obtuse angle, which is beneficial to draining accumulated water along the extending direction of the extending portion 212 and preventing parts from rusting due to accumulated water residue.

A notch 21a is formed in the lower end edge of the front wall 2111 of the protrusion 211 of the vibration damping bracket 21, and the notch 21a can discharge foreign matter such as gravel entering the closed annular structure formed by the vibration damping bracket 21 and the support bracket 22, so as to prevent the foreign matter from striking the subframe or other parts of the vehicle body to generate noise and affecting the riding experience of the driver.

A notch 22b is formed in the lower edge of the corner between the rear wall 221 and the side wall 222 of the support bracket 22, and this notch 22b enables the residual liquid on the side to flow out during coating. A notch 22c is formed in the lower edge of the side wall portion 222 of the support bracket 22 that is connected to the end of the base portion 210 of the damper bracket 21, and this notch 22c enables air bubbles generated during coating to flow out.

A positioning notch 21b is formed in the upper end edge of the extension portion 212 of the damper bracket 21, and a positioning hole 22a is formed in the side wall portion 222 of the support bracket 22, and the positioning notch 21b and the positioning hole 22a are used to position the damper bracket 21 and the support bracket 22 during welding.

As shown in fig. 12, rounded corners 212a are formed at the left and right edges of the extension portion 212, and the radius of the rounded corner 212a is set to 2 times or more the plate thickness of the 1 st bracket 21. By such a design, the welding quality of the rounded corner portion can be improved.

In the present embodiment, the front of the suspension attachment bracket portion 11 is open, and the damper bracket 21 is disposed near the opening edge of the housing portion 11, so that vibrations generated near the opening edge can be effectively suppressed.

The inventor of the present application made an actual product to verify the effect of the present invention, specifically as follows:

[ example 1 ]

The structure of example 1 is identical to the structure of the subframe 100 described in the above embodiment.

[ example 2 ]

The vibration damping structure 2 of example 2 is similar to example 1 except that the positioning hole 22a, the notch 22b, the notch 21a, and the notch 21b are not provided, as compared to example 1.

[ COMPARATIVE EXAMPLE ]

The comparative examples do not have the vibration damping structure 2 as compared with examples 1 and 2.

As shown in fig. 13, with the structure of the comparative example, the peak value of the noise is large and exceeds the design requirement; the vibration damping effect of the

embodiments

1 and 2 is basically the same, the peak value of the noise is effectively suppressed, and the design requirement can be met.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

For example, in the above embodiment, the vibration damping structure 2 is attached to the housing portion 1, but the present invention is not limited to this, and may be applied to a subframe 100 that does not have a housing portion 1 in the center portion in the left-right direction.

In the above embodiment, the support bracket 22 has a U-letter shape, but the present invention is not limited to this, and may be formed in a semicircular arc shape, for example. In the vibration damping structure 2, the vibration damping bracket 21 plays a major vibration damping effect, and therefore, the support bracket 22 may be omitted.

Claims

1. An auxiliary frame comprises an auxiliary frame body (1) and a damping structure (2), and is characterized in that,

the vibration damping structure (2) includes a vibration damping bracket (21), the vibration damping bracket (21) extends in the left-right direction as a whole and is configured in a state of standing from the upper surface of the subframe body (1), the vibration damping bracket (21) is fixed to the upper surface of the subframe body (1),

an accommodating part (11) which is bulged upwards is arranged at the central part of the auxiliary frame body (1) in the left-right direction, and the vibration damping bracket (21) spans the central axis of the accommodating part (11) and is fixed with the left side part and the right side part of the accommodating part (11).

2. The subframe of claim 1 wherein,

the housing part (11) has a top wall part (111) and side wall parts (112) extending downward from both left and right ends of the top wall part (111),

the damper bracket (21) is fixed to the top wall portion (111) and the side wall portion (112) so as to straddle a corner portion between the top wall portion (111) and the side wall portion (112).

3. The subframe of claim 1 wherein,

the vibration damping support (21) is provided with a protruding part (211) protruding along the direction far away from the vertical surface of the vibration damping support (21).

4. The subframe according to any one of claims 1 to 3,

the vibration reduction structure (2) further comprises a supporting bracket (22), and the supporting bracket (22) is fixed on the upper surface of the auxiliary frame body (1) and connected with the vibration reduction bracket (21).

5. The subframe of claim 4 wherein said subframe is a hollow subframe,

the supporting bracket (22) and the vibration reduction bracket (21) are connected to form a closed annular shape.

6. The subframe of claim 4 wherein said subframe is a hollow subframe,

the vibration damping support (21) is provided with a base portion (210), extending portions (212) are arranged at two ends of the base portion (210), the supporting support (22) is connected with the base portion (210) to form an annular polygon, and the extending portions (212) are located on the outer side of the annular polygon.

7. The subframe of claim 6 wherein,

the supporting bracket (22) is a U-shaped bracket, an opening of the U-shaped bracket is connected with the base part (210), and the U-shaped bracket is fixed on an accommodating part (11) arranged on the auxiliary frame body (1).