JPH0512082Y2 - - Google Patents

Description

[Detailed Description of the Invention] Prior Art The present invention relates to an axle suspension system for a motor vehicle with a constant vehicle distance, especially a rear axle suspension system, which has vertical links that are strong in bending and torsion, especially a joint or connecting link shaft. a vertical link, one end of which is pivotally connected to the vehicle body so as to be pivotable in one vertical plane about an axis extending perpendicular to the longitudinal direction of the vehicle; The other end of the vertical link holds the wheel pin of the wheel. A device of this type is known, for example, from DE 2103399 or DE 2220119.

Connecting links or connecting link shafts of the above type are considered to be of a very advantageous type and are increasingly used, since their overall structure is not only relatively light but also provides good running properties. A further great advantage of this type is that in total only two body-side bearing points are required for the pivotable pivoting of the link axle, which do not fit into the existing vertical bearings of the vehicle floor structure. It is possible to arrange it within the range of the direction support body.

Axle suspensions are also known in which a single stationary longitudinal link is arranged, but this longitudinal link also has a very wide bearing base, taking into account the lateral forces that must be supported by this link. A body side bearing must be provided.

These known axle suspensions generally have separate telescoping shock absorbers and spring legs or coil springs acting on the wheel holders (axle pins) or on the ends of the longitudinal links, in order to elastically suspend the vehicle. I am using it. However, in order to fix this spring mechanism to the body side, a raised part of the body (spring dome) that protrudes into the interior of the vehicle is required to a greater or lesser extent, and this raised part reduces the usable space inside the vehicle, especially The so-called loading width, ie, the inner diameter between the two spring domes, can be significantly impaired in some cases.

It is also known in connection with longitudinal links to provide, in order to elastically suspend a vehicle, a leaf spring mechanism which extends perpendicularly to the longitudinal direction of the vehicle and is supported in the center of the vehicle body. However, this known example is not intended for an axle suspension system in which the wheel distance is constant.

In an axle suspension of this type, known from U.S. Pat. No. 3,147,815, the driven rear wheels of a motor vehicle are guided by longitudinal and transverse links. A leaf spring mechanism supported centrally in the vehicle body and extending at right angles is disposed laterally at a distance behind each drive half. Each free end of the leaf spring mechanism is fixed via a substantially vertically extending connecting rod to a rearwardly directed extension of the longitudinal link, which extension is connected to the leaf spring mechanism and the longitudinal link. It is pivotally mounted to the center using a large rubber member to allow angular movement over the entire surface.

In another axle suspension of the type described above, known from DE 29 27 486 A1, a leaf spring mechanism positioned at right angles to the longitudinal direction of the vehicle performs its predetermined vehicle elastic suspension function. In addition, it also serves as a lateral guide and additionally as a swaying element. In this case, a vertical link and a damping foot are each provided as further wheel guide elements,
Both are pivotally connected to the vehicle body by a fully angular hinge. The leaf spring mechanism is rotatably mounted to the vehicle body about a predetermined longitudinal axis. Each free end of this leaf spring arrangement is connected by a respective hinge, which is substantially inflexible in the longitudinal direction of the vehicle, to a hinge axis extending substantially in the longitudinal direction of the vehicle. With this leaf spring mechanism, when it swings up and down in the same direction (accompanied by a change in wheel distance), it is possible to rotate around a predetermined vertical axis at the pivot point on the body side, so there is almost a bending movement. In the case of up-and-down movement in one or the other direction, a strong torsional action is additionally required. In this known axle suspension, vertical oscillations are associated with strong wheel distance changes.

Problems to be solved by the invention This invention solves the problems of the above-mentioned known examples, enables a larger loading width while keeping the wheel distance constant, and furthermore, allows the vertical link to be pivoted on the body side. The aim is to reduce structural costs for

Means for Solving the Problems According to the means of the present invention for solving the above problems, in order to elastically suspend the vehicle, a. b) a leaf spring mechanism is arranged, and at the free end of the leaf spring mechanism (b) a power transmission member is arranged bent over the mechanism and located in a plane perpendicular to the longitudinal direction of the vehicle and at least approximately vertical; It is fixed immovably, that is, in a stable manner in shape and angle, and (c) each end of the leaf spring mechanism is bent downward in the unloaded state of the vehicle, and (d) the above-mentioned basic deflection amount of the leaf spring mechanism and The bending angle of the power transmitting member is such that the free end of the power transmitting member is at least substantially immediately displaced vertically when the leaf spring mechanism is freely and smoothly displaced between no load and full load. Each free end of the e-transmission member is pivotally connected to the longitudinal link by a hinge capable of angular movement at least substantially over its entire surface.

That is, according to the present invention, in order to elastically suspend the vehicle, a leaf spring mechanism is provided that extends perpendicularly to the longitudinal direction of the vehicle and is supported in the center of the vehicle body, and the free end of the spring to the vertical link is provided. The pivoting connection is carried out by means of a special pin-like force transmitting element, which on the one hand forms a pivoting connection that is largely free from compression;
On the other hand, at least a portion of the lateral forces acting on the wheels are introduced directly into the vehicle body at the level of the axle via a perpendicularly extending leaf spring system, so that the body-side bearings of the longitudinal links are guided accordingly. load reduction takes place, so that this bearing can be made smaller or softer in the longitudinal direction of the vehicle, i.e. more comfortable to drive, or, in the case of a single articulated longitudinal link, a bearing on the body side. The supporting base of the part can be made smaller.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawing shows an axle suspension for a non-driven rear axle. Each wheel 1 is guided via a vertical link 2 that is strong in bending and torsion, and this vertical link 2 is rotatable in a substantially vertical plane about an axis 8 extending at right angles to the longitudinal direction of the vehicle. It is pivotally connected to the vehicle body 3. A wheel pin (shaft leg) 4 of a wheel is attached to the free end of the vertical link 2.

In the example shown in the upper half of FIG. 2, a single vertical link is provided as the vertical link 2, which is pivoted on the body side by means of a bearing with a relatively wide base, and Therefore, the lateral drag force acting on the wheels is supported.

However, the longitudinal links may also be members of known joint or connecting link axes, as shown in the lower half of FIG. In the vicinity of the vertical links, they are connected to each other by cross members 9 which are strong in bending but weak in torsion and fixed in shape and angle stability to the vertical links. The required body-side link bearing is smaller than in the case of a single longitudinal link as described above, since the very wide base of this link connection (distance between both bearings) is required to support the transverse forces acting on the wheel. ) is valid.

In order to elastically suspend the vehicle, a leaf spring mechanism 5 is provided which extends perpendicularly to the longitudinal direction of the vehicle and which is centrally supported on the vehicle body 3 and which in the illustrated example has only one plate. It consists of a spring. Pivotal attachment to the vehicle body is conventionally effected by two clamps or the like 10.

The pivoting of the leaf spring mechanism to the two longitudinal links 2 is carried out by means of pin-shaped force transmitting elements 6, which are attached to each free end of the leaf spring mechanism and bent relative to this end. It extends perpendicularly to the longitudinal direction of the vehicle and is fixed stably in shape and angle so as to be located at least in a substantially vertical plane (see FIGS. 1 and 3). The free end of this transmission member 6 is attached to the longitudinal link 2 by a hinge 7 which allows at least approximately full angular movement. In order to ideally achieve this effect, in addition to conventional ball bearings, it is also possible to use metal/rubber members that are commonly used as pivots for telescopic shock absorbers, for example.

When the leaf spring mechanism 5 is on an unloaded vehicle, i.e. in an unloaded state, both ends of the leaf spring mechanism 5 are bent downward, i.e., at position 5'' in FIG. 3. The angle at which the pin-shaped power transmission member 6 protrudes from the leaf spring mechanism means that the free end of the pin-shaped power transmission member 6 is in its unloaded state unless disturbed by an external action. The design is such that there is at least a substantially straight vertical displacement movement during the transition from to the fully loaded state.In FIG. 3, this straight vertical displacement movement is shown in dotted lines.

In the illustrated example, the pin-shaped power transmission member 6 is oriented approximately at right angles to the surface of the leaf spring. As can be easily seen from the drawing, the leaf spring mechanism 5 is located at position 5'' in FIG.
When displacing from (no load) to full load,
On the other hand, the effective length (projected length onto the travel path) of the leaf spring mechanism 5 is expanded, and at the same time, the bent pin-shaped power transmission member 6 is made to rotate three-dimensionally to face each other. By suitably adjusting the basic deflection of the leaf spring mechanism 5 and the angular position of the force transmitting member 6, an at least approximately straight vertical displacement movement of the free end of the force transmitting member 6 is possible without any problem. Become.

With the construction of the invention, the free end of the pin-shaped force transmitting element 6 carries out an at least approximately straight vertical displacement movement, so that the force transmitting element can be moved over the entire surface without the need for a pivoting strap or the like. It can be pivoted to the longitudinal link 2 for angular movement but also for power transmission, so that the power transmission member is not compressed to a large extent when the wheel 1 is swung up and down. Therefore, only the arcuate displacement movement of the end of the vertical link needs to be compensated for by the rotational elasticity of the leaf spring mechanism 5.

Effects With the wheel suspension according to the invention with constant wheel distance, the entire space between the two wheels 1 can be used for the interior of the vehicle, and in particular a correspondingly large loading width can be created. . Furthermore, since at least a portion of the lateral forces acting on each wheel can be received by the leaf spring mechanism 5 directly at the height of the wheel axle, the body-side bearings of the longitudinal links 2 are relieved of load, and The structure of the bearing can thus be made correspondingly smaller, which leads to better space utilization. In addition, instead of reducing the structure of the vertical link support on the body side, the structural dimensions of the support in the longitudinal direction of the vehicle are maintained, but the structure is made softer, and the resulting longitudinal elastic action is It is also possible to further improve driving comfort.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the axle suspension system according to the present invention, and FIG.
The figure shows the device in Figure 1 viewed in the direction of the arrow, and Figure 3.
The figures show the leaf spring mechanism of FIG. 1 in the direction of the arrows and in different displacement positions. DESCRIPTION OF SYMBOLS 1... Wheel, 2... Vertical link, 3... Vehicle body, 4... Wheel pin, 5... Leaf spring mechanism, 6...
Power transmission member, 7... Hinge, 8... Pivoting axis, 9...
...Horizontal material, 10...Clamp.

Claims (1)

[Claims for Utility Model Registration] 1. An axle suspension system for an automobile with a constant wheel distance, which has a vertical link that is strong in bending and torsion, and one end of this vertical link is perpendicular to the longitudinal direction of the vehicle. a type that is pivotally connected to the vehicle body so as to be pivotable in one vertical plane about an axis extending in the vertical direction, and in which the other end of the vertical link holds a wheel pin of a wheel, In order to elastically suspend the vehicle, a leaf spring mechanism 5 extending perpendicularly to the longitudinal direction of the vehicle and supported at the center of the vehicle body 3 is disposed; The power transmitting member 6, which is bent at the angle 5 and located perpendicularly to the longitudinal direction of the vehicle and at least in a substantially vertical plane, is fixed immovably, that is, with stable shape and angle; c. in the unloaded state of the vehicle; , leaf spring mechanism 5
Each end of d is bent downward, and the above-mentioned basic deflection amount of the leaf spring mechanism 5 and the bending angle of the power transmission member 6 are such that the leaf spring mechanism 5 is bent between no load and full load. The free ends of the power transmitting members 6 are designed to perform at least a substantially straight displacement movement in the vertical direction when displacing freely and smoothly, and each free end of the power transmitting members 6 is connected to a vertical link. 2,
Axle suspension with constant wheel distance, characterized in that it is pivoted by a hinge (7) which is at least substantially entirely angularly movable. 2. The power transmission member 6 is positioned approximately perpendicular to the leaf spring surface, and the basic deflection amount of the leaf spring mechanism 5 is such that even when the wheel 1 is under full load and in the maximum downward swing state, the leaf spring mechanism 5 is 2. The axle suspension system according to claim 1, wherein each end portion is designed not to be displaced higher than the height of the portion of the leaf spring mechanism supported by the vehicle body 3.