DE3324321A1 - Self-adjusting shock absorber, especially for motor vehicles - Google Patents

Abstract

The invention relates to a self-adjusting shock absorber, especially for motor vehicles, which comprises a cylinder closed at both ends and is filled with at least one damping medium and has a piston rod which dips into the cylinder in a sealed fashion and which on its cylinder-side end carries a piston which is sealed off from the cylinder wall and divides the cylinder chamber into two chamber halves, the piston rod, starting from its end up to the joining of the two chamber halves having a longitudinal bore in the area of the piston and above this at least two radial passages passing through the longitudinal bore which are displaceable by means of an electrically controlled control slide valve which is moved by means of a coil according to patent application P 3312899.5. Baffle plates, which, standing parallel to the piston rod, are fixed to this and aligned pointing radially outwards, are arranged in front of the passages.

Description

Designation: Self-regulating shock absorber, in particular

for motor vehicles additional patent to patent P 33 12 899.5 description The invention relates to a self-regulating shock absorber, in particular for motor vehicles, which consists of a cylinder closed at both ends and at least one The damping medium is filled and has a piston rod which is sealed into the Cylinder is immersed and the one at its end on the cylinder side against the cylinder wall sealed piston - if necessary with high and low pressure valves - carries, which divides the cylinder space into two chamber halves, with the piston rod from their front end starting for - possibly additional - connection of the two chamber halves a longitudinal bore in the area of the piston and above it has at least the longitudinal bore penetrating radial openings through an electrically controlled spool can be locked, which is connected to the Piston rod arranged electrical coil is moved according to patent application P 33 12 899.5.

Such a self-regulating shock absorber according to the preamble of Claim 1 has been proposed by patent application P 33 12 899.5 When moving the control spool quickly, swirling of the through the Breakthroughs occur through damping medium, which leads to a reduction in the Lead the flow rate and thus the flow rate through the openings can.

The invention is therefore based on the object of a self-regulating To improve shock absorbers of the type mentioned in such a way that a radial outflow of the damping medium passing through the openings into the upper half of the chamber is.

This object is achieved according to the invention by the characterizing Features of claim 1.

Further refinements of the invention are set out in the subclaims marked.

The self-regulating shock absorber has the advantage that even at high Flow velocity of the damping medium through the openings creates a turbulence of the damping medium no longer takes place because the same thing through the baffles when exiting the breakthroughs is forced in the radial direction.

This means that there are no more turbulences. The arrangement of the baffles is particularly advantageous when the control slide is a sleeve-shaped rotary slide valve is that the particles of the damping medium passing through during its rapid movement impresses a tangential acceleration component.

Immediately after exiting the breakthroughs, here from the control openings of the control slide are affected by their tangential speed components on the guide plates Impacting particles of the damping medium are deflected by the baffles and in deflected radial direction outward.

This means that when using a rotary valve according to the patent application P 33 12 899.5 directly in front of the breakthroughs and the passage openings of the rotary valve no eddies or turbulence @ but a practically laminar particle flow of the damping medium guaranteed.

An example of the invention is shown in the drawing and subsequently described. The figures show: FIG. 1 a cross section through an entire shock absorber to represent the cylinder, the piston rod, the rotary valve, the magnets and the guide plates and FIG. 2 shows a plan view of the cross section along the cutting line A-A in Figure 1.

+ more available, According to FIG. 1, there is the rule face shock absorber 1 from a cylinder 2, which is closed at both ends. The cylinder 2 is filled with at least one damping medium, this being a liquid and / or can be a gas. The upper end of the cylinder is by means of a cylinder cover 16 closed, it being possible for this to be screwed into the cylinder 2. Through the Cylinder cover 16, a piston rod 3 protrudes into cylinder 2, whereby the passage is sealed by means of a ring seal 17 to the piston rod. At the top of the Piston rod and at the lower end of the cylinder is each a holder 4.5 for Attachment of the shock absorber 1 on the one hand to the body and on the other hand on the Wheel or arranged on the axle of the vehicle. The piston rod is preferably hollow and has a longitudinal bore 51 into which an end piece 52 is screwed at the lower end is.

The piston rod 3 has a piston at its end 15 on the cylinder side 8, which is normally designed in the shape of a slide. This piston is means of a nut 14 which is screwed onto the lower end of the piston rod 15 connected to the piston rod.

The piston 8 can be an ordinary piston, such as is used in shock absorber construction It is known why the piston 8 has through-bores 9, 10, which by means of Spring assemblies 11, 12 are covered The springs can have different spring values, for example have, whereby the piston 8 represents a high pressure and a low pressure valve. The piston 8 divides the cylinder interior into a lower chamber half 6 and one upper chamber half 7, which is thus in the embodiment shown in Figure 1 on the Through bores 9, 10 are in communication with one another.

The piston rod 3 can have an end piece 52 which is inserted into the The piston rod 3 is screwed in and on which the piston 8 is placed. That lower end 15 of piston rod 3 or

of the end piece 52, starting from the end face of the end piece 52, a longitudinal bore 24 which runs centrally to the longitudinal axis of the piston rod 3 and extends over the piston 8. Transverse to this longitudinal bore 24 has the End piece 52 or the piston rod 3 above the piston 8 openings that radially penetrate the longitudinal bore 22, the number of these openings just or odd. In Fig.

1 and 2 are marked two openings, here a through hole Form 25 along a diameter. According to the desired characteristics can the openings be designed like a slot or conical. To increase the flow through the openings or the bores, a plurality of them can be radially Arrangement. The bores 24, 25 thus connect the chamber halves 6 and 7 with one another and thus create 8 in the preferred use of the piston a bypass with high and low pressure valves.

The piston rod 3 has 7 magnets in the area of the upper chamber half 20, 21, which are arranged in a ring around the piston rod and which are fixed with these are connected. These magnets are preferably rod-shaped and extend parallel to the longitudinal axis of the piston rod, as shown in FIG. 1. The magnets each have an excitation coil 22, 23 for generating a magnetic flux within the respectively controlled magnets.

For example, the magnets 20, 21, as shown in FIG. 2, in be arranged equidistant distances on a disc 19, which has a centric Has bore through which the piston rod 3 is guided. The piston rod can do this have a circumferential shoulder 18 with a thread in the end region, the washer 19 is screwed onto the piston rod 3. This is how the magnets are fixed connected to the piston rod 3. On the piston 8 is coaxial around the piston rod 3 arranged around in the area of the transverse bore 25 a rotary valve 26, which is sleeve-shaped is formed and which also has two through bores 31, 32 (Fig. 2), which coincide with the transverse bore 25 at a certain position of the rotary valve can be brought. The rotary valve can now be controlled electrically be rotated via the magnets, which is detailed in patent application P 33 12 899.5 is described.

A ring 60 is placed on the lower end 29 of the magnets 20, 21, which surrounds the magnets from the outside and is firmly connected to them. Are on the ring, preferably directly below the face of the magnets 20, 21, guide plates 61, 62, 63, 64, 65, 66, 67, 68 arranged, which are in the height of the transverse bore 25 or

of the bores 31, 32 protrude within the rotary valve 26 and the are directed radially outwards. The surface of the baffles is parallel to the Piston rod 3 directed.

Fig. 2 shows the arrangement of the baffles in the radial direction of the Transverse bore 25 or the breakthroughs, which are preferably in an even multiple of 2 may be present.

The number of baffles is not determined by the number of magnets, but is determined by the flow conditions.

List of reference symbols 1 shock absorber 2 cylinder 3 piston rod 4,5 Brackets 6 lower chamber half 7 upper chamber half 8 pistons 9,10 valve bores 11, 12 valve springs 13 ring seal 14 motor 15 lower end of piston rod 16 Cylinder cover 17 ring seal 18 shoulder 19 disc 20,21 magnets 22,23 excitation coils 24 longitudinal bore 25 transverse bore 26 rotary valve 27,28 cam 29 lower end of the Magnets 30 torsion spring 31,32 bores inside the rotary valve 33 disc 34,35,36, 37,38,49,50,53 cams 39 stator 40,41,42,43,44,45 magnets 47 pole shoe 48 paragraph 46 Control Circuit 51 Hole 52 End piece 54 Accelerometer 55 End piece 56 Blind bore 57 Valve 58 Compression spring 59 Connections of the excitation coils 60 ring 61 - 68 guide plates - blank page -

Claims (3)

Claims 1. Self-regulating shock absorber, in particular for motor vehicles, which consists of a cylinder closed at both ends and at least one The damping medium is filled and has a piston rod which is sealed into the Cylinder is immersed and the one at its end on the cylinder side against the cylinder wall sealed piston - if necessary with high and low pressure valves - carries, which divides the cylinder space into two chamber halves, with the piston rod from their front end starting for - possibly additional - connection of the two chamber halves a longitudinal bore in the area of the piston and above it has at least two radial openings penetrating the longitudinal bore, which can be closed by an electrically controlled control slide, which is operated by means of on the piston rod angeordnefer electrical coil is moved according to patent application P 33 12 899.5, characterized in that in front of the openings (25) guide plates (61,62,63,64,65,66,67,68) are arranged, which are parallel to the piston rod (3), attached to this and directed radially outward. 2. Self-regulating shock absorber according to claim 1, characterized in that that the guide plates (61,62,63,64,65,66,67.68) are attached to a ring (60), which includes the piston rod (3). 3. Self-regulating shock absorber in which the control slide is a sleeve-shaped Is rotary valve, which coaxially surrounds the piston rod in the area of the openings and the radial openings in its wall corresponding to the number of openings has, which when the rotary valve is rotated relative to the piston rod, the openings release more or less, the rotary valve as a rotor one Stepping motor is designed, the stator of which consists of a plurality of magnets, which each have an excitation coil and which also surround the piston rod coaxially, wherein the magnets are rod-shaped and at their upper ends on the piston rod supported and arranged in a circle around the same and parallel to it, and the excitation coils can be controlled individually or in pairs opposite each other and the rotary valve is a sleeve with the cams magnetizable along its circumference carries, the magnets designed as an internal rotor rotary valve up to Project beyond the area of the cams and are designed as pole shoes, according to claim 1 or 2, characterized in that the ring (60) is the lower end (29) of the magnets (20,21) on the outside and the Leithleche (61,62,63,64,65,66,67,68) after pointing downwards in front of the openings (25) in the radial direction to the piston rod (3) are arranged.