JPS6189103A - Axle beam structure - Google Patents

Abstract

PURPOSE:To prevent an axle from being deformed even through it touches an obstruction, by attaching a protector member for an axle beam body on to the front side wall of the axle beam body through the intermediary of a resilient member. CONSTITUTION:An axle beam 21 is composed of a U-like cross-sectioned shape beam body 22 having its opening section directed downward to avoid being accumulated therein with water, dust, etc., and a V-like cross-sectioned shape protector member 24 attached to the front side wall 22c of the beam body 22. The protector member 24 is attached to the side wall 22c through the intermediary of a spacer 25, and is formed to be inclined, in its front side outer peripheral section 24A, downward of the side wall 22c. With this arrangement, even though the axle beam touches an obstruction, impact force may be dampened by the protector member, thereby it is possible to prevent the axle beam from being deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to an axle beam structure of a rear wheel suspension system for an F, F, or vehicle.

[Prior art]

As shown in Figure 11, the conventional rear wheel suspension system for F, F, cars includes an axle beam 2 extending in the wheel width direction between the left and right brake drums 4.
It consists of a trailing arm 6 and a shock absorber 8 with a coil spring, which are respectively attached between the axle beam 2 and the main body (not shown).

As shown in Fig. 12, the axle beam 2 is formed to have a U-shaped cross section in order to maintain appropriate torsional rigidity, and also to prevent water, dust, etc. from accumulating within the axle beam. Therefore, the two openings are arranged so as to face downward. Reference numeral 9 denotes a stabilizer to reduce vehicle body roll and improve running stability.It extends in the vehicle width direction inside the axle beam 2, and both ends of the stabilizer are attached to the endracruz (Fig. (not shown)
Fixed.

[Problem that the invention seeks to solve]

As shown in FIG. 12, the conventional axle beam 2 is disposed with the two openings facing downward, so the axle beam side walls 2B and 2C are perpendicular to the vehicle running direction. Therefore, when the axle beam 2 comes into contact with a large obstacle 11 such as a tall stone on the road while the vehicle is running (arrow A indicates the direction of vehicle travel), the horizontal collision force with the obstacle 11 will increase. P acted directly on the axle beam 2, pushing and bending the side wall 2C of the axle beam, deforming the axle beam, and sometimes even deforming the stabilizer 9.

Therefore, as shown in FIG. 13, an axle beam body protection member 14 that has a downwardly inclined outer peripheral surface 14A and extends in the vehicle width direction is attached to the front side wall 12C of the axle beam body 12 by bolts and nuts. An axle beam structure has been proposed in which the axle beam is fixed and attached using fixing means such as welding or adhesive.

This causes the inclined outer circumferential surface 14A of the axle beam main body protection member 14 to act as a warp, allowing the axle beam to slide over the obstacle, and the horizontal collision force acting on the axle beam due to contact with the obstacle. This is an attempt to reduce P.

However, in the axle beam structure according to this new proposal, since the axle beam main body protection member 14 is directly attached to the axle beam main body 12, the torsional rigidity of the axle beam becomes large, which causes problems when the vehicle rolls or when driving on rough roads. A new problem has emerged in which the ground contact of the wheels of the vehicle is poor.

Therefore, as shown in Figure 1, an axle beam front end is proposed in which a protective member 14 is attached to the axle beam main body side wall 12C via a spacer 13, and the beam main body 12 and spacer 13 are arranged with a predetermined distance apart. has been done. This is because the torsional rigidity of the axle beam is increased by attaching the protection member 14 to the axle beam body 12, but the protection member 14 is provided at a predetermined distance from the axle beam body 12 (J, thickness of the spacer 13). Since the axle beam main body 12 and the protective member 14 are spaced apart from each other by a distance of
This means that the increase in MII properties can be suppressed to a low level.

However, the axle beam main body 12, the spacer 13, and the support member 14 are all formed of metallic materials,
Since the beam body 12 and the spacer 13 and the spacer 13 and the retaining member 14 are rigidly joined, an increase in torsional rigidity of the axle beam is unavoidable.

The present invention has been made in view of the above problems, and its purpose is to prevent deformation of the axle beam by attaching a protective member to the axle beam body, and to provide a twisted structure of the axle beam. be.

Means for Solving Problem C] In order to achieve the above object, the axle beam structure according to the present invention includes a front side wall of an axle beam body extending in the vehicle width direction, and a sloped outer periphery facing downward of the front side side wall. The present invention is characterized in that an axle beam body protection member having a surface and extending in the vehicle width direction is attached via an elastic member, and with this configuration, the above object is achieved.

[For production]

Next, the operation of the present invention will be explained. When the axle beam comes into contact with an obstacle on the road while the vehicle is running, first the axle beam body (hereinafter referred to as the single beam body)
The outer peripheral surface of an axle beam body protection member (hereinafter simply referred to as a protection member) attached to the front side wall comes into contact with an obstacle.

However, since the outer circumferential surface of this protective member is sloped downward from the front side wall of the beam body, the maintenance section L→・
/ II's work is flourishing 1 Completed? II/k'-80i±↓HoldingGj The member can slide over the obstacle as one body and overcome the obstacle.bTherefore, the horizontal collision force due to contact with the obstacle is alleviated. deformation of the beam body is prevented.

In addition, since an elastic member is interposed between the protective member and the beam body, the axle beam is more likely to twist than when the beam body and the protective member are rigidly connected. The increase in torsional stiffness is significantly smaller.

[Embodiments of the invention]

Next, embodiments of the present invention will be described based on the drawings.

1 and 2 show a first embodiment of the present invention, and FIG. 1 is a perspective view of a rear wheel suspension system of an F, F, car to which the axle beam structure of the present invention is applied. FIG. 2 shows a cross-sectional view of the axle beam structure.

As shown in FIG. 1, the rear wheel suspension system 20 includes an axle beam 21 having brake drums 4, 4 attached to both ends thereof and extending in the width direction of the vehicle; A pair of trailing arms 6.6 are attached to the beam 21, and the other end extends to the front side and is attached to the vehicle body (not shown), and one end is attached to this beam 21, and the other end is attached to the vehicle body. It is composed of a pair of shock absorbers 8, 8 with coil springs.

As shown in FIG. 2, the axle beam 21 has a U-shaped cross section and a beam main body 22 which is arranged with the opening facing downward to prevent water and dust from accumulating inside the axle beam 21. and the front side wall 22C of this beam body 22.
The protective member 2 is attached to and has a U-shaped cross section.
It is composed of 4.

The protection member 24 is attached to the side wall 22C at both longitudinal ends via spacers 25, and the front outer circumferential surface 24A of the protection member 24 is sloped downward from the side 122c.

A bolt 26 is provided protruding from the spacer 25, and a "ff" mm H/'P socket 27 in which a bolt insertion hole is formed is interposed in the retaining member 24. By inserting the bolt 26 and tightening the nut 29 via the retainer 28, the protection member 24 is attached to the side wall 22C.
installed on. In addition, the code|symbol 25A is the welding bead 1.

Next, we will explain the effect of the axle beam structure according to this example.
The explanation will be based on 3N (a) to (C).

As shown in FIG. 3(a), when the axle beam 21 comes into contact with an obstacle 11 that protrudes high on the road, the outer surface 24A of the retaining member 24 first comes into contact with the obstacle 11.

Then, the axle beam 21 touches the outer peripheral surface 24 of the protection member 24.
It slides on the outer surface of the obstacle like a sled using A as a sliding surface, and can jump over the obstacle 11 as shown in FIGS. 3(b) and (C).

When the axle beam 21 comes into contact with an obstacle in this way,
When the beam main body side walls 22B and 22C slide on the obstacle and face the obstacle, a large horizontal collision force as shown by the symbol P in FIG. 11 does not act on the axle beam 2.
1 deformation is prevented. Further, since the large horizontal collision force P does not act on the axle beam 21, there is no shock to the tower occupants.

Note that when the axle beam 21 passes over the obstacle 11 while contacting the obstacle, the axle beam 21
However, if this axle beam push-up amount h (see No. 31'1(b)) is small, the shock absorbers 8 with coil springs provided at both ends of the axle beam 21 , 8 absorbs the upward force, and the vertical force caused by the axle beam 21 contacting the obstacle 11 is not transmitted to the vehicle body. Also, if the amount of push-up is large, is it possible to push it up with shock absorbers 8 and 8 with coil springs? Hh
Since it cannot absorb all the energy, the vehicle body is also pushed upwards. Furthermore, due to the action of the coil spring-equipped shock absorbers 8, 8, the vertical impact force caused by the axle beam 21 coming into contact with the obstacle 11 is alleviated and transmitted to the vehicle body. It is not a connection.

Further, the protective member 24 is arranged at a predetermined distance (equivalent to the thickness of the spacer 25) from the beam body 22, and only both ends of the protective member 24 are fixed to the beam body 22 via the spacer 25. Since the rubber pad 27 is interposed between the spacer 25 and the protection member 24, the amount of increase in torsional rigidity of the axle beam 21 is extremely small.
It does not adversely affect the stability of the vehicle when it rolls or the ground contact when driving on rough roads.

FIG. 4 shows a second embodiment of the invention.

A protective member 30 having a protrusion bent into a dogleg shape in cross section and having an inclined outer circumferential surface 30A is fixed to the front side wall 22C of the beam body 22 by welding at both ends via a spacer 25. Installed in the width direction.

The lower side edge 31 of the protection member 30 is bent and extends below the front side wall 22C.

In this manner, in this embodiment, the protection member 28 functioning as a sled extends below the front side wall 22C of the beam body, so that the axle beam can reliably slide over obstacles. Therefore, this embodiment is more effective in preventing deformation of the axle beam than the first embodiment.

FIG. 5 shows a third embodiment of the present invention, which differs from the second embodiment (see FIG. 4) in that the shape of the protective member 32 attached to the beam body 22 is different. It is at one point. The protective member 32 has a protruding portion that is dogleg-shaped in cross section, similar to the protective member 30 in the second embodiment, and furthermore, the lower side edge portion 33 passes below the beam body 22 and extends below the rear side wall 22B. It is located in

In this way, in this embodiment, the sleeping member 3 that functions as a sled is used.
2 extends below the rear side wall 22B of the beam body, so the axle beam can reliably slide over obstacles. Therefore, this embodiment is more effective than the second embodiment (see FIG. 4) in preventing deformation of the axle beam.

Further, FIG. 6 shows a fourth embodiment of the present invention. The protection member 34 wraps around below the beam main body 22 and protrudes toward the rear side, and is curved upward, and an inclined outer circumferential surface 34A facing downward of the beam main body 22 is also formed on the rear side. This embodiment is effective in preventing deformation of the axle beam not only when the vehicle is moving forward but also when the vehicle is moving backward.

FIG. 7 shows a fifth embodiment of the present invention, in which a protective member 24 is attached to the front side wall 22C of the beam main body 22 via a rubber elastic body 36, and its ends are connected to the pole 1-26A and the nut 29. It is fixed by.

That is, by interposing the elastic body 36 between the beam bodies 2, 2 and the protection member 24, an increase in torsional rigidity of the axle beam is suppressed. The elastic body 36 is one that is interposed in the entire longitudinal direction of the vehicle, or one that is attached to the bolt 2.
6A or one interposed only in the vicinity of the fixed portion by the nut 29, either of these may be used, but the latter can suppress the increase in torsional rigidity of the axle beam to a smaller extent than the former.

FIGS. 8 to 10 show still other embodiments of the present invention.

In FIG. 8, the beam main body 42 is formed to have a U-shaped cross section, and is arranged with the opening 42A facing upward. Note that reference numeral 43 is a drain hole for discharging water, dust, etc. within the beam body 42. FIG. 9 shows that the cross-sectional shape of the beam body 52 is L-shaped.
The figure shows the beam body 62 having a T-shaped cross section. In this way, the cross-sectional shape of the beam main body does not have to be U-shaped as shown in the first to fourth embodiments, but can have a cross-sectional shape that can maintain the torsional rigidity at an appropriate value. It is fine as long as it is something.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the axle beam does not deform even if it comes into contact with an obstacle, and the torsional rigidity of the axle beam does not deteriorate. Therefore, if the present invention is applied to a vehicle, the ability to travel on rough roads can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 shows F and F to which the first embodiment of the present invention is applied. A perspective view of the rear wheel suspension system of a car, Figure 2 is shown in Figure 1, and a
3(a) to 3(C) are explanatory diagrams explaining the operation of the first embodiment of the present invention, and FIG. 4 is a main part showing the second embodiment of the present invention. A cross-sectional view, FIG. 5 is a cross-sectional view of a main part showing a third embodiment of the present invention, and FIG.
FIG. 7 is a cross-sectional view of the main part showing the fifth embodiment of the present invention, and FIGS. 8 to 10 are cross-sectional views of the main part showing other embodiments of the present invention. The front view, Figure 11 is the conventional F,
F is a perspective view showing the rear rear suspension system of a car; FIG. 12 is a sectional view showing a state in which a conventional accelerator beam contacts an obstacle;
FIGS. 13 and 14 are cross-sectional views of main parts showing an embodiment of another invention proposed to solve the conventional interlayer problem. 6... Trailing arm, 8... Shock absorber with coil spring, 9... Stabilizer, 11
... Obstacle, 21 ... Axle beam, 22, 42
゜52.62... Axle beam body, 25... Spacer, 24, 30, 32.34... Axle beam protection member, 24A, 30A, 34A... Inclined outer peripheral surface,
27...Rubber pad, 28...Retainer, 36...
...Elastic body.

Claims (4)

[Claims] (1) An axle beam body protection member extending in the vehicle width direction and having a downwardly inclined outer peripheral surface of the front side wall is attached to the front side wall of the axle beam body extending in the vehicle width direction. An axle beam structure characterized in that an elastic member is interposed between the axle beam body protection member and the axle beam body protection member. (2) The axle beam structure according to claim 1, wherein the axle beam main body has a U-shaped cross section and is disposed in a downwardly open state. (3) The axle beam structure according to claim 1, wherein the axle beam body protection member wraps around below the axle beam body. (4) The axle beam body protection member wraps around below the axle beam body and protrudes toward the rear side, and this rear side protrusion is curved upward to form an inclined outer circumferential surface. The axle beam structure according to scope 3.