DE10252188A1 - Adaptive axle bearing for influencing vehicle horizontal, vertical dynamics has additional spring unit connected in series or parallel with spring element joining inner, outer attachment arrangements - Google Patents

Abstract

The adaptive axle bearing (2) has the inner side of an outer attachment arrangement (6) connected to the periphery of an inner attachment arrangement (8) via a rubber-elastic spring element (4) that separates two or more air chambers (10,12) and an additional spring unit connected in series or in parallel with the spring element. A parallel spring unit has an elastic membrane or a flexurally stiff plate.

Description

A generic axle bearing is from the JP 09-137847 known.

Except those in the preamble of Main claim enumerated Features this axle bearing one with an inclined Diaphragm sealed passage. For small vibration amplitudes at higher This membrane is flexible at frequencies. With the help of an electromagnet the membrane is locked and thus the flexibility is prevented.

Influencing larger amplitudes at low frequencies is not possible with the known axle bearing.

Matched to the braking process the rigidity of a generic axle bearing in particular at low frequencies can be varied to target to take the horizontal and vertical dynamics of a vehicle.

Solution and benefits

As can be seen from claim 1, can the spring element of the axle bearing according to the invention another Spring unit can be connected in series or in parallel.

For example, a thin-walled stop can be used with air or with liquid be pumped up. The bearing is stiff when it is inflated elevated. Because the stop, which is covered with a flexible membrane, is very wide Dimensions with any pressure can be applied, there is a size Span of stiffness change. That way improved Hortzontal / Vertical dynamics at certain driving conditions realize.

Instead of one with a flexible membrane covered chamber can also be a chamber with a rigid Plate be covered. If this chamber is evacuated and presses the Plate against a stop, the rigidity of the Axle bearing increased dramatically. Before the plate reaches the stop, a continuous Pressure is reduced, which also results in a continuous change in stiffness or stiffness adjustment.

Except for a stiffness adjustment with the help of a spring unit connected in series with the spring element parallel connection is also possible. In the proposed according to the invention Solution with Magnetic spring can be connected to a hydraulic supply for regulation to be dispensed with. An electrical current can also be used here a widely changing bearing stiffness be achieved.

In order to avoid excessive deflection forces destruction a bearing pad and / or should preferably be avoided a stop is provided.

Three embodiments of the axle bearing according to the invention are shown in the drawings and in the description below explained in more detail. It shows:

1 a first embodiment of the axle bearing according to the invention in cross section;

2 Force / displacement diagrams of this exemplary embodiment;

3 and 4 a second and a third embodiment, each in cross section.

description

This in 1 First embodiment of an axle bearing according to the invention shown in cross section 2 has a two-leg, left / right symmetrical spring element 4 on. The ends of this spring element 4 are each with the as an external fastener 6 serving inside of the hollow cylindrical housing of the axle bearing 2 connected. On the axis of symmetry of the spring element 4 is an internal fastener axially 8th vulcanized. Both sides of the legs 4a . 4b of the spring element 4 and the wall of the housing 6 formed spaces 10 . 12 are not closed off from the environment.

With radial loading of the axle bearing 2 there is a deformation of the spring element 4 and thus the fastener moves 8th towards the membrane 14 , Touch the bodies 8th and 14 , this results in increased stiffness for the further travel. When the spring element is relieved 4 the reverse is true.

Between the thighs 4a . 4b of the spring element 4 formed space 12 is with the help of an elastic membrane 14 a lockable volume 16 partially separated. That volume 16 can be inflated with air or a liquid from the outside and thus adjusts to the spring element 4 parallel spring element.

The 2 shows the relevant force / displacement characteristics, namely the solid line gives the "normal case" without pressurizing the volume 16 while the dashed line represents the characteristic curve for the inflated state.

This in 3 Also shown in cross section, the second embodiment also has a two-leg, left / right symmetrical spring element 4 on. The ends of the thighs 4a . 4b this spring element 4 are interposed by a coaxially arranged tube 18 with the as outside outer fastener 6 serving inside of the hollow cylindrical axle bearing housing 6 connected. On the axis of symmetry of the spring element 4 is also an internal fastener axially 8th appropriate.

Both sides of the legs 4a . 4b of the spring element 4 and the inner wall of the tube 18 formed spaces 10 . 12 are connected to the environment (open).

That between the outer extensions of the legs 4a . 4b , a segment of the tube serving as a rigid plate 18 and the space formed inside the hollow cylindrical housing 16 can be supplied with air or liquid from the outside and thus serves as a spring element 4 Series-connected spring unit, the stiffness of which can be varied widely.

Will the room 16 evacuated, the pipe segment serving as a rigid plate presses 18 against an attack 20 , which drastically increases the spring stiffness.

This in 4 The third exemplary embodiment shown represents a parallel connection of two springs with variable overall spring stiffness.

This axle bearing 2 also has a two-leg, left / right symmetrical spring element 4 on. The ends of the thighs 4a . 4b this spring element 4 are also each with the as an external fastener 6 serving inside of the hollow cylindrical axle bearing housing 6 connected. On the axis of symmetry of the spring element 4 is also an internal fastener axially 8th vulcanized. Both sides of the legs 4a . 4b of the spring element 4 and the wall of the housing 6 formed spaces 10 . 12 are connected to the environment (open).

The spring element 4 a magnetic spring is connected in parallel. That is on the outer fastener 6 a solenoid 22 attached while an anchor is in operative connection with it 24 via a support pad 26 on the inner fastener 6 is appropriate.

When actuating (energizing) the solenoid 22 the bearing stiffens 2 because the lifting magnet serves as a magnetic spring 22 parallel to the spring element 4 is switched.

2

axle bearings, camp

4

spring element

4a, 4b

leg of the spring element

6

hollow cylindrical Housing, external fastener

8th

inner fastener

10

Room, air chamber

12

Room, air chamber

14

elastic membrane

16

lockable volume

18

rigid Plate, coaxially arranged pipe, pipe segment

20 20 '

attack

22

solenoid

24

anchor

26

support cushion

Claims (7)

Adaptive axle bearing ( 2 ) where the inside of an external fastener ( 6 ) via a rubber-elastic spring element ( 4 ) which has at least two air chambers ( 10 . 12 ) separated from each other, with the circumference of an inner fastener ( 8th ) is connected, characterized in that the spring element ( 4 ) Another spring unit is connected in series or in parallel. Axle bearing according to claim 1, characterized in that a spring unit connected in parallel has an elastic membrane ( 14 ) or a rigid plate ( 18 ), whereby between the outer fastening means ( 6 ) of the axle bearing ( 2 ) and the elastic membrane ( 14 ) or the rigid plate ( 18 ) a lockable volume ( 16 ) is formed. Axle bearing according to claim 2, characterized in that the volume ( 16 ) can be acted upon or evacuated from the outside with air and / or hydraulic fluid. Axle bearing according to claim 3, characterized in that the loading or evacuation of the volume ( 16 ) is variable and can be adjusted to the respective spring situation of the vehicle. Axle bearing according to claim 1, characterized in that the spring element ( 4 ) spring unit connected in parallel is a magnetic spring. Axle bearing according to claim 5, characterized in that the magnetic spring is a solenoid ( 22 ) with anchor ( 24 ), the lifting magnet ( 22 ) on the outer fastener ( 6 ) and the anchor ( 24 ) on the inner fastener ( 8th ) is attached. Axle bearing according to one of claims 1 to 6, characterized by a stop ( 20 . 20 ' ) and / or a cushion ( 26 ).