JP3493361B2 - Rear structure of vehicle with axle beam suspension - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body rear structure of a vehicle equipped with an axle beam type suspension.

[0002]

2. Description of the Related Art As a conventional vehicle body rear structure, for example, there is one as shown in FIG.
No. 73). 2a is a rear floor panel, and 2b is a luggage floor panel. Reference numeral 16 is a spare tire pan, and 1 is a rear side member. And
The rear floor 2a panel and the luggage floor panel 2
A wheel house 6 is formed on the side of b, and a strut housing 7 is formed in the wheel house 6 at the rear pillar 4.
Are integrally formed along the line.

At the boundary between the rear floor panel 2a and the luggage floor panel 2b, an upper cross member 10 and a lower cross member 12 each having a hat-shaped cross section are joined vertically facing each other. The lower cross member 12 is for supporting an axle beam type suspension mechanism (not shown), and is located in front of the strut housing 7. Further, a brace 11 extending obliquely upward is connected to both ends of the upper cross member 10, and a tip end of the brace 11 is connected to a rear pillar 4 located on a front side of the strut housing 7.

[0004]

However, in such a conventional technique, although the strut housing 7 itself is a noise source for generating a vibrating sound to the outside due to the vibration from the strut mechanism, etc. Since the whole 7 is at the rear position of the brace 11 and is exposed to the vehicle interior space R, it is very disadvantageous in terms of measures against noise inside the vehicle. Originally, it is desired to cover the strut housing 7 with the brace 11. However, due to the large height size H of the strut housing 7 and the structural reason of the conventional axle beam type suspension mechanism, the position of the strut housing 7 is set to the front side. It is practically impossible to cover the strut housing 7 with the brace 11 because it cannot move.

However, recently, it is possible to suppress the scuff change to the road surface with or without the roll of the vehicle body, to eliminate the generation of the jack-up force due to the action of lateral force, and to change the behavior when traveling straight or turning on uneven roads. A new type of axle beam suspension arrangement structure has been proposed that enables stable vehicle running with less fuel consumption (Japanese Patent Application No. 4-243589). That is, a vehicle body member provided between a pair of left and right rear side members arranged along the vehicle front-rear direction and having a convex shape toward the lower side of the vehicle body, and one end attached to the vehicle body member and the other end left and right. A Panhard rod attached to an axle beam connecting the rear wheels, an assist link having one end attached to an intermediate position of the Panhard rod and the other end attached to the axle beam, the other end of the Panard rod and the And an absorbing member which is interposed between the axle beam and is displaceable in the axial direction of the Panhard rod.

The structure of the axle beam suspension has the advantages that the height size of the strut housing can be reduced and the strut housing can be positioned on the front side.

The present invention has been made by paying attention to the arrangement structure of such a new type of axle beam type suspension, and solves the problem relating to the noise of the strut housing.

[0008]

In order to achieve the above-mentioned object, a vehicle body rear structure of a vehicle equipped with an axle beam suspension according to the present invention has a pair of left and right rear sides arranged along the vehicle longitudinal direction. It is provided between members,
A vehicle body member that is convex toward the lower side of the vehicle body, an upper cross member that is attached to the upper side of the vehicle body member, and has a substantially hat-shaped cross section, a brace that connects left and right ends of the upper cross member and a rear pillar, and one end. Is attached to the vehicle body member, the other end is attached to the axle beam connecting the left and right rear wheels, one end is attached to an intermediate position of the Panard rod, and the other end is attached to the axle beam An assist link, an absorbing member that is interposed between the other end of the Panhard rod and the axle beam, is displaceable in the axial direction of the Panhard rod, and has its upper end attached to the upper surface of the left and right strut housings and its lower end. A strut supported at both ends of the axle beam; and a mounting point of the Panhard rod to a vehicle body member, and both struts. The vehicle body rear structure of the vehicle equipped with an axle beam suspension in which the attachment points to the strut housing are respectively arranged in front of the axle beam, and the braces connected to both ends of the upper cross member are strut housing true. The upper cross member is connected to the upper rear pillar, and the strut housing is covered with both ends of the upper cross member and the braces.

[0009]

According to the present invention, the axle beam type suspension structure is adopted in which the attachment points of the Panhard rod to the vehicle body member and the attachment points of both struts to the strut housing are arranged in front of the axle beam. Therefore, both struts can be tilted forward, the height of the strut housing can be kept low, and the strut housing can be positioned on the front side as compared with the conventional case.

Therefore, the brace connected to both ends of the upper cross member can be connected to the rear pillar directly above the strut housing, and the strut housing can be covered with both ends of the upper cross member and the brace. It is possible to prevent the noise from being diffused into the vehicle interior space, which is advantageous in terms of noise countermeasures.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are views showing a preferred embodiment of the present invention. First, the underfloor structure centering on the suspension will be described. Reference numeral 1 denotes a rear side member, which is joined to the lower surfaces on the left and right sides of the rear floor panel 2a and the luggage floor panel 2b, respectively, in a state of being along the front-rear direction. In the middle of the rear side member 1, there are formed bent portions 3 that face inward. At the rear end of the rear side member 1, there is provided a tie-down 5 for hanging a hook (not shown) for fixing the vehicle body during transportation of the vehicle.

Left and right bent portions 3 of the rear side member 1
The lower cross members 12 having a U-shaped cross section are connected to each other. Then, an inverted triangular Panhard rod bracket 13 is joined to the front and rear side surfaces of the lower cross member 12, respectively. The lower cross member 12 and the Panhard rod bracket 13 constitute a vehicle body member 14. The lower end portion 15 of the Panhard rod bracket 13 is located slightly to the left of the left-right center portion of the vehicle body with respect to the entire vehicle body.
The spare tire pan 16 recessed in the luggage floor panel 2b is located substantially in the center thereof.

At the rear side position of the bent portion 3 of the rear side member 1, an axle beam 18 having rear wheels 17 at both ends is arranged along the lateral direction of the vehicle body. Both ends of the axle beam 18 are connected to the rear side member 1 via a trailing arm 19, and the trailing arm 19 receives a force in the front-rear direction input from the rear wheel 17.

The lower ends 9b of the struts 9 are connected to the upper surfaces of both ends of the axle beam 18. Further, the upper end 9a as the "attachment point" of the strut 9 is fixed to the upper portion of the strut housing 8 as described above. The upper end 9a of the strut 9 is located on the front side and the inner side of the lower end 9b. Therefore, when viewed in the front-rear direction, since the upper end 9a side of the strut 9 is inclined forward, the height size h of the strut housing 8 to which the upper end 9a is fixed becomes smaller than that of the conventional strut. The entire housing 8 is located on the front side.
With this structure, in this embodiment, the strut housing 8, the lower cross member 12, and the upper cross member 39, which will be described later, are at the same front and rear positions. Furthermore, when viewed in the left-right direction, both struts 9 are “c” when viewed from the rear.
Since it is in the shape of, the strut 9 receives an input from the rear wheel 17 in the vertical direction.

20 is a Panhard rod, and the vertical width is set large only in the middle part, and that part is a double structure part 21 divided into front and rear. In addition, a substantially vertical elliptical opening 22 penetrating in the front-rear direction is formed in the double structure portion 21. This Panhard rod 2
The left end 20a of 0 is attached to the lower end portion 15 of the Panhard rod bracket 13 via a bush 23. The left end 2 which is the attachment point of the Panhard rod 20 to the vehicle body member 14
0a can be located directly below the vehicle body member 14 because the Panhard rod 20 is sufficiently shorter than the conventional one (it was located in front of the vehicle body member 14 because the long Panhard rod was diagonally arranged in the past). The front and rear positions are the same as those of the strut housing 8.

The right end 20b of the Panhard rod 20
Is attached to a support pin 25 of a bracket 24 provided on the right side of the axle beam 18 via an anisotropic bush 26 as an "absorbing member".

On the other hand, of the upper surface of the axle beam 18,
Another bracket 27 is provided at a position corresponding to the opening 22 of the Panhard rod 20, and the left end 28a of the assist link 28 is attached to the bracket 27 via a bush 29. The right end 28b of the assist link 28 is attached to the right side position of the double structure portion 21 of the Panhard rod 20 via a bush 30.

Next, other underfloor structures will be described. An exhaust pipe 31 extends rearward along the right rear side member 1. A parking brake cable 32 is arranged outside the trailing arm 19 and is connected to a central pad portion of the rear wheel 17. The reason why the parking brake cable 32 can be routed to the outside of the trailing arm 19 is that the Panhard rod 2
This is because the length of 0 can be shortened. On the right side, the parking brake cable 32 and the exhaust pipe 31 are close to each other, but since the trailing arm 19 is interposed between the parking brake cable 32 and the exhaust pipe 31, the trailing arm 19 serves as a heat shield plate and the parking brake cable 32 is The exhaust pipe 31 is protected from heat.

A filler tube 33 is a fuel tank 34.
Is connected via a hose 36 to a connection port 35 at the rear end on the left side. The filler tube 33 is used for the vehicle body member 1.
After passing under the No. 4, it is bent outward and extends. The filler tube 33 is fixed from below by a bracket 37 in the vicinity of a connecting portion to the hose 36. That is, the right end of the bracket 37 is fixed to the side surface of the Panhard rod bracket 13 with the bolt 38, and the left end thereof is attached to the lower surface of the rear side member 1 together with the vehicle body member 14 by the bolt 38.
It is also fixed at. Further, in the fuel tank 34 according to this embodiment, since the parking brake cable 32 is routed to the outside of the trailing arm 19 as described above, the width of the left and right can be expanded accordingly, and the tank capacity can be expanded. Has been planned.

Next, the floor structure will be described. An upper cross member 39 having a hat-shaped cross section is mounted on the lower cross member 12 constituting the vehicle body member 14 by bolt / nut means B. Of the front and rear flanges 40 of the upper cross member 39, the front flange 40
Has an extension portion 40a joined along the inclined portion 41 of the rear floor panel 2a, and this portion is also attached to the corresponding inclined portion 41 by the bolt / nut means B.

Both ends 42 of the upper cross member 39 are
The upper surface 42a is formed to bulge obliquely upward. The angle of the upper surface 42a is set so as to face the rear pillar 43 just above the strut housing 8. Both ends 42 of the upper cross member 39 are in a state of substantially covering the strut housing 8,
Of the strut housing 8 and the sides of the strut housing 8
It is attached by nut means B.

Then, inside both ends 42 of the upper cross member 39, a brace 44 having a downward U-shaped cross section is formed.
The base end portions 45 of the above are superposed, and their side surfaces and upper surfaces are fixed by bolt / nut means B, respectively. The front end portion 46 of the brace 44 is provided with the rear pillar 4 directly above the strut housing 8 via the flange 44a.
3 and the other portions are also joined to the wheel house 6 via another flange 44b.

Therefore, the strut housing 8 is entirely covered by the both ends 42 of the upper cross member 39 and the brace 44, and the vibration sound emitted from the strut housing 8 is also blocked by the brace 44 and the upper cross member 39. Therefore, it does not diverge to the vehicle interior space R side, which is advantageous for noise countermeasures.

Further, since the brace 44 is connected to the rear pillar 43 in a straight state integrally with both end portions 42 of the upper cross member 39, the upper cross member 3
The input from 9 can be reliably received by the rear pillar 43, and conversely, the input from the rear pillar 43 can be reliably received by the upper cross member 39.
Particularly, since the both end portions 42 of the upper cross member 39 and the base end portion 45 of the brace 44 where the input is most concentrated are mounted in a superposed state, the input is surely transmitted.

In addition, since the strut housing 8 of this embodiment is located on the front side of the prior art, the luggage space can be expanded accordingly.

Next, the advantages of the above-mentioned underfloor structure will be described. In the suspension of this embodiment, the assist link 28 is attached to the double structure portion 21 at the middle position of the Panhard rod 20.
Since the vehicle body member 14 side is provided with a single point,
The axle beam 18 side is supported at two points, and the right end 20b of the Panhard rod 20 is provided with an anisotropic bush 20 that absorbs lateral displacement. Therefore, the displacement itself in the left-right direction of the vehicle body member 14 due to road surface input is prevented. It can be kept small. Further, the structure itself of the Panhard rod 20 is one-point support on the vehicle body member 14 side and two-point support on the axle beam 18 side as described above, which means that the axle beam on the two-point support side is The positional relationship of 18 is maintained, and the scuff change with respect to the road surface can be suppressed to be small regardless of the vehicle body posture with the axle beam 18 (that is, the road surface) as a reference. Therefore, the amount of scuff when the wheel bounces / rebounds to the road surface is suppressed regardless of the presence or absence of the body roll, and when the rear wheel 17 bounces / rebounds even in the body roll state, Even if a force in the left-right direction is applied to the ground contact point, the link arrangement does not change regardless of the vehicle body roll, so that the vertical component force of the Panhard rod 20 does not generate a jack-up force for lifting the vehicle body member 14 from the left end 20a.

Further, since the vehicle body member 14 to which the Panhard rod 20 is attached has an inverted triangular shape and the width of the root portion of the lower cross member 12 is sufficiently wide, the input applied from the Panhard rod 20 is effectively applied to the rear side member 1. Can be communicated. In addition, since the lower end 9b of the strut 9 is attached to a position outside the trailing arm 19 of the axle beam 18, the distance between the left and right lower ends 9b can be widened, and stable vehicle running with little change in behavior when rolling the vehicle body can be realized. .

In the above description, the vehicle body member 14 is constructed by combining the lower cross member 12 and the Panhard rod bracket 13 together.
Alternatively, the Panhard rod bracket 13 and the Panhard rod bracket 13 may be integrally formed in advance. Further, as long as it is provided between the rear side members 1, the lower cross member 12 may not be provided and only the Panhard rod bracket 13 may be provided.

[0029]

The vehicle body rear structure of the vehicle equipped with the axle beam suspension according to the present invention has the contents described above, and the braces connected to both ends of the upper cross member are directly above the strut housing. Since it is connected to the rear pillar and the strut housing is covered with both ends of the upper cross member and the brace, it is possible to prevent noise from being diffused into the vehicle interior space of the strut housing, which is advantageous in terms of noise countermeasures.

Further, since both ends of the upper cross member where the input is most concentrated and the brace are attached in a superposed state, the input transmission is surely performed between the upper cross member and the brace.

[Brief description of drawings]

FIG. 1 is a plan view showing a rear structure of a vehicle body of an axle beam type suspension vehicle according to an embodiment of the present invention.

FIG. 2 is a side view of a partial cross section showing a state seen from a DA direction shown by an arrow in FIG.

FIG. 3 is a perspective view around a strut housing showing a DB portion indicated by an arrow in FIG.

4 is a cross-sectional view taken along the line SA-SA shown in FIG.

FIG. 5 is a perspective view corresponding to FIG. 3 showing a conventional example.

[Explanation of symbols]

1 Rear side member 2a Rear floor panel 2b luggage floor panel 8 strut housing 9 struts 9a Upper end (mounting point to strut housing) 12 Lower cross member 13 Panhard rod bracket 14 Body members 17 rear wheel 18 Axle beam 20 Panhard rod 28 Assist link 39 Upper cross member 42 Both ends of upper cross member 42a Upper surface of both ends 43 Rear pillar 44 brace

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-48-53420 (JP, A) JP-A-6-92121 (JP, A) Actually open 61-57084 (JP, U) Actual-open Flat 4- 45184 (JP, U) Actual development Sho 61-147673 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 25/08

Claims (2)

(57) [Claims] 1. A vehicle body member that is provided between a pair of left and right rear side members arranged along the vehicle body front-rear direction and has a convex shape toward the lower side of the vehicle body, and a cross section attached to the upper side of the vehicle body member. A generally hat-shaped upper cross member, a brace connecting the left and right ends of the upper cross member to a rear pillar, one end attached to the vehicle body member, and the other end attached to an axle beam connecting left and right rear wheels. A Panhard rod, one end of which is attached to an intermediate position of the Panhard rod, and the other end of which is attached to the axle beam, and an assist link which is interposed between the other end of the Panhard rod and the axle beam, Absorbing member that can be displaced in the axial direction of Panhard rod, the upper end is attached to the upper surface of the left and right strut housing, the lower end is the axle beam An axle beam suspension in which the attachment points of the Panhard rod to the vehicle body member and the attachment points of both struts to the strut housing are provided in front of the axle beam. In the vehicle body rear structure of the mounted vehicle, the brace connected to both ends of the upper cross member is connected to the rear pillar directly above the strut housing, and the strut housing is covered with the both ends of the upper cross member and the brace. The rear structure of the vehicle body equipped with the axle beam type suspension. 2. The upper cross member is formed so as to bulge obliquely upward on both upper end portions of the upper cross member, and the brace is superposed and connected to both end portions of the upper cross member in an inclined state substantially along the upper end portions of the upper end. Rear structure of the vehicle equipped with the axle beam suspension described.