JP2602390Y2 - Rear suspension mounting structure of vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension mounting structure for a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 2, a rear suspension of a vehicle includes a suspension arm which is pivotally mounted on a cross member of the vehicle body so as to be able to swing up and down, and a suspension tower b which is formed in a cylindrical shape on a part of a wheel apron a. during the shock absorber c and or suspension springs d like
Interposed an elastic member for buffering, on the suspension reaction force
A suspension tower b and a wheel apron a formed with the suspension tower via a buffering elastic member
And a side frame e fixed to the wheel apron, a rear pillar inner f and the like to disperse and absorb (see, for example, Japanese Utility Model Application Laid-Open No. 60-68875).

[0003]

The rear suspension mounting structure as described above has a problem that the projecting suspension tower b reduces the volume of the trunk room. The suspension tower is abolished, and a shock-absorbing telescopic member such as a shock absorber c or a suspension spring d is interposed between the suspension arm and the lower surface of the side frame e. . However, when such a configuration is employed, the allowable expansion and contraction stroke of the shock-absorbing expansion and contraction member such as the shock absorber c and the suspension spring d must be limited by the height of the side frame e projecting downward from the floor surface. There arises a problem that it is not possible to make the expansion stroke too large.

If the cross-sectional height of the side frame is partially reduced, the allowable expansion and contraction stroke of the shock-absorbing expansion and contraction member such as the shock absorber and the suspension spring can be increased. However, if the cross-sectional height of the side frame is reduced. There is a problem that the frame strength is reduced.
That is, the side frame is fixed along the lower side edge of the floor to form a closed cross section in the front-rear direction. Since the vertical wall functions dominantly in the frame strength, the height of the vertical wall is partially reduced. If the height is lowered, the strength and rigidity near the rear suspension mounting portion decrease, which is not preferable in terms of measures against vibration noise and operability.

Further, the side frame is curved inward and upward along the lower edge of the rear wheel apron in the vicinity of the rear suspension mounting portion, so that when a frontal collision load acts from the rear end of the side frame at the time of a rear collision. There is a problem that it is easy to bend near the rear suspension mounting portion which is curved as described above, and it is difficult to sufficiently absorb the collision energy.

An object of the present invention is to address the above-mentioned conventional problems.

[0007]

According to the present invention, a front frame joined to a lower surface of a rear floor and a lower frame below the rear floor are provided.
Joined to the surface and connected to the rear end of the front frame
And a rear frame that constitutes a side frame,
A predetermined range of the rear part of the front frame has a lower cross-sectional height than the cross-sectional height of the rear frame, and the predetermined part of the rear part of the front frame fits into the rear frame at a side frame curved portion at the lower edge of the rear wheel apron. And a rear suspension mounting portion for mounting an upper end of a shock-absorbing telescopic member of a rear suspension on a bottom surface of a portion fitted and fixed in the rear frame of the front frame. On the bottom
A fitting insertion hole is provided below the mounting portion for inserting the elastic member .

[0008]

With the above construction, the allowable expansion / contraction stroke of the shock-absorbing expansion / contraction member can be made larger than that of the conventional structure in which the bottom surface of the side frame is used as the mounting surface of the shock-absorbing expansion / contraction member. At the same time, the part that receives the suspension load functions as a partition for reinforcing the rear frame in a predetermined range on the rear side of the front frame by fitting and fixing the front frame and the rear frame, and the strength and rigidity near the rear suspension mounting part is This greatly improves vibration noise and improves operability. Further, when a forward collision load is input from the rear bumper to the side frame due to a rear collision, the curved portion of the side frame is reinforced by the wrap between the front frame and the rear frame as described above, so that the curved portion is not bent. Since the rear frame buckles without occurrence, the collision energy can be accurately absorbed. In addition, the split structure of the front frame and the rear frame makes it possible to make the material, cross-sectional shape, and the like of the rear frame suitable for a preferable buckling mode at the time of a rear collision regardless of the front frame. It becomes easy to further improve the energy absorption function.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rear side frame which is joined and fixed to a lower surface of a side edge of a rear floor 6 to form a closed cross section in the front-rear direction of the vehicle body. The side frame 1 comprises a front front frame 2 and a rear rear frame. The rear part of the front frame 2 and the front part of the rear frame 3 are wrapped and connected to each other at the inward and upward curved portions of the rear wheel apron 7 so as to be integrally continuous. An elastic member for cushioning a rear suspension is provided on a rear portion of the front frame 2 which is formed in the side frame 1 and is fitted and connected to the rear frame 3.
5 constitutes a rear suspension mounting portion for mounting the upper end of the rear suspension 5 . Reference numeral 4 denotes a doubler joined and fixed in the rear frame 3.

That is, the front frame 2 and the rear frame 3 have longitudinal wall surfaces 22 and 32 on both sides formed with bent flange surfaces 23 and 33 at the upper ends, and bottom surfaces 21 and 31, respectively. 6 to form a closed cross-section in the front-rear direction by being fixedly bonded to the lower surface of the front frame 2. The bottom surface 21 of the rear frame 3 gradually rises upward with respect to the bottom surface 31 of the rear frame 3 to partition the closed cross section of the rear frame 3 up and down at the bottom surface 21.
A predetermined range portion at the rear end of 1 is configured to be located at a central portion of the closed section height formed by the rear frame 3 or above it. At the rear end of the bottom surface 21, a mounting hole 21a for mounting the upper end of the shock-absorbing elastic member 5 of the rear suspension is formed, and the periphery of the mounting hole 21a is reinforced by bonding and fixing the reinforcement 21b. ing. The mounting hole 21a on the bottom surface 31 of the rear frame 3
A fitting hole 31a is formed at a position opposed to the fitting hole 31a for fitting the elastic member 5 for buffering .

An elastic member 5 for cushioning the rear suspension
Is formed of a shock absorber 51 and a suspension spring 52 as is well known in the art. The upper end of the shock absorber 51 is inserted through a fitting hole 31a formed in the bottom surface 31 of the rear frame 3 and the bottom surface of the front frame 2 is formed. By attaching to the mounting hole 21 a provided in the front frame 21, the bottom surface 21 of the front frame 2 receives a suspension load input via the shock absorber 51 and the suspension spring 52.

A bumper stay 81 of a rear bumper 8 is fitted to the rear end of the rear frame 3 and is fixed to the rear frame 3 by a bumper bracket 9.

As described above, the side frame 1 is divided into the front frame 2 and the frame 3, and the cross-sectional height of the curved portion of the side frame gradually decreases in a predetermined range at the rear portion of the front frame 2. The rear frame 3 is fitted and fixed in the rear frame 3, and the upper end of the shock-absorbing telescopic member 5 of the rear suspension is provided on the bottom surface of the portion of the front frame 2 fitted and fixed in the rear frame 3. By configuring, the bottom of the side frame
Compared with the conventional configuration that a mounting surface of the elastic member for buffering, it is possible to increase the permissible expansion stroke of the telescopic member 5 made of a shock absorber 51 and a suspension spring 52, a portion subjected to suspension load Front A predetermined area on the rear side of the front frame 2 functions as a reinforcing partition plate for the curved portion of the rear frame 3 by fitting and fixing the frame 2 and the rear frame 3, and the strength and rigidity in the vicinity of the rear suspension mounting portion are greatly increased. It is possible to reduce vibration noise and improve maneuverability.

Further, when a frontal collision load is input from the rear bumper 8 to the side frame 1 due to a rear collision, the curved portion of the side frame 1 at the rear wheel apron 7, that is, the rear suspension mounting portion is easily bent.
In the present invention, since the curved portion of the side frame is reinforced by the wrap between the front frame 2 and the rear frame 3 as described above, the rear frame 3 buckles without bending at the curved portion at the time of a rear collision. By doing so, it is possible to accurately absorb the collision energy. In addition, since the front frame 2 and the rear frame 3 are divided, the material, cross-sectional shape, and the like of the rear frame 3 can be adapted to a preferable buckling mode at the time of a rear collision. Can be further improved. In addition, since it can be reinforced as needed at a necessary place, it can be said that the structure is advantageous in terms of cost and weight, and is also suitable for repairability.

[0016]

As described above, according to the present invention , the front frame joined to the lower surface of the rear floor and the rear floor
At the rear end of the front frame
And a rear frame that is combined to form a side frame.
The cross-sectional height of the rear part of the front frame in a predetermined range is
The front frame is configured to be lower than the cross-sectional height of the rear frame, and the front frame is wrapped in a predetermined range within the rear frame at the side frame curved portion of the lower edge of the rear wheel apron and integrally joined, and the front frame is connected to the rear frame. For cushioning the rear suspension on the bottom of the lap
By installing the upper end of the telescopic member ,
The allowable expansion / contraction stroke of the shock-absorbing expansion / contraction member can be made larger than before, and the strength and rigidity in the vicinity of the rear suspension mounting portion provided on the curved portion of the side frame can be improved without using special reinforcing parts. As a result, it is possible to reduce the vibration noise of the vehicle body and improve the operability. Further, it becomes difficult for the side frame to be bent at the curved portion of the side frame at the time of a rear collision, and it becomes possible to accurately absorb the collision energy by buckling deformation of the rear frame behind the rear suspension mounting portion. This can improve the performance and can bring a great effect in practical use in combination with the reduction in cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a plan view of one side frame, (B) is a side view of (A),
(C) is a sectional view taken along line CC of (B), and (D) is a sectional view of line D-
D sectional view, (E) is EE sectional view of (B).

FIG. 2 is a cross-sectional view showing an example of a conventional rear suspension mounting structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Side frame 2 Front frame 3 Rear frame 5 Telescopic member 6 Rear floor 7 Rear wheel apron 8 Rear bumper

Claims (1)

(57) [Scope of request for utility model registration] 1. A front joined to a lower surface of a rear floor.
Frame and a lower surface of the rear floor.
Combined with the rear end of the front frame to form a side frame
A rear frame having a predetermined range of cross-sectional height at a rear portion of the front frame lower than a cross-sectional height of the rear frame. Into the rear frame and fixedly joined together.
Constituting a rear suspension attaching portion for attaching the <br/> upper end of the telescopic member cushioning of the rear suspension on the bottom of the fitting fixed portion in the rear frame of the front frame
At the same time, the expansion and contraction section
A rear suspension mounting structure for a vehicle, comprising a fitting hole into which a material is inserted .