DD159803A2 - FRICTIONAL DAMPER FOR VIBRATED MACHINES AND DEVICES, IN PARTICULAR DRUM MACHINES - Google Patents

Abstract

The invention relates to a Reibungsdaempfer for vibration damped machines and equipment, especially for drum washing machines, consisting of a cylindrical housing and an axially displaceable Stoessel. With the invention, the goal is pursued to achieve a more intense excitation-strong friction damping and lower static subsidence of the vibration system. The technical problem to be solved by the invention is that an amplitude and direction-dependent Reibungsdaempfung is realized, the effect of which are optimally assigned to the existing conditions of the device. According to the invention, this is achieved in that the bobbin has a plurality of grooves running out at their ends and a plurality of sliding bodies engaging in the grooves are assigned to the friction piston whose inclination corresponds to the inclination of the slot outlets and the pins of the sliding bodies are arranged so as to be free of contact with the parallel groove base. Areas of application of the invention are: drum washing machines and centrifuges.

Description

Title of the invention

Friction damper for vibration damped machines and equipment, in particular drum washing machines

Aawendungs'gebiet the invention

The invention relates to a friction damper for vibration-damped machines and devices, in particular drum washing machines, according to patent 142 911, consisting of a cylindrical housing and an axially displaceable ram.

Ghar akti ri stiK de r _ b e b e b e t i n i. rule _T _Lö sung; s well known from the · Patent 142,911, including the characteristics of previously known technical solutions from DE-A 28 15 596; DB-OS 28 20 651; DE-AS 28 37 801; DE-GM 72 41,987; DE-GM 75 0899; DE-GM 75 26 781, have the overall disadvantage that the frictional forces can only be chosen as large as they can be absorbed by the device in its most unfavorable direction of action, whereby the In.ten ~ sity of the friction damping suffers enormous restrictions and in dependence From the filling of the washing and centrifugal drum more or less strong lowering of the vibration system is less counteracted.

Object of the invention

With the invention, the aim is to achieve a more intense friction damping 'and low-excitation friction transmission.

23090

Darlesung the essence of the invention

The technical problem to be solved by the invention, "is that 'an amplitude and riehtungsanhängige friction damping is realized, the effects of which are optimally assigned to the existing conditions of the device ·

• A feature of the invention "is that the plunger has a plurality of obliquely expiring at their ends grooves and the friction piston a plurality of engaging in the grooves sliding body are arranged, the inclination of the end faces of the inclination of the Nutenausläufe and the pins of the slider to the parallel groove bottom without contact Another feature of the invention is that the grooves have different lengths, so that the bevels are offset from one another in the direction of movement of the plunger.

Execution sbe i spi e1

The invention will be explained in more detail with reference to an embodiment. In the. associated drawings. show j

SIg. 1: a sectional view of the friction damper Fig. 2i is a schematic diagram for explaining the function Hg · 3: a principle diagram for explaining the effect

in the resonance range SIg · 4: a principle diagram for explaining the effect in the stationary region Hg. 5: a basic diagram for explaining the effect

Uigur 1 shows a friction damper. The housing 3 receives the friction bushing 2. In the friction bush 2, the plunger 1 is guided, wherein under the spring force of the annular spring 6, the friction force F _R1 acts. On the plunger 1, the boundaries are 5 & it attached rubber discs attached and obliquely outgoing grooves 13 incorporated.

23090

On "the plunger 1, between the boundaries 5 and the rubber discs 9, the friction piston 4 is displaceably arranged with the spring clips 7j with the friction lining 11, the springs 8 and the sliding bodies 10. The spring force of the springs 8 causes the frictional force F to act ^ between spring clips 7 and housing 3 as well as the spring force Fg ₂ or "Fg" with the axial force component Fc at the corners expire 12. The operation is shown in Figure 2. When a force F acts followed by a movement of the plunger 1, w. Within the sliding range damping is generated by the frictional forces F _{R /} j and F ^ or, F ^, Fg ^ and F ^ until it hits the boundary 5 ". In this position, the movement of the friction piston 4 begins, which results in greater friction. is generated by the now acting frictional forces F _{R /} , and F .This process repeats continuously over the plus, minus region, resulting in a reduction in the vibration amplitude below the sliding region Stable Ivüttigkeitslage for the friction piston 4-, whereby the damping by the friction forces F ™ + F-np or, at the Nutenausläufen 12 in the upward movement of the plunger 1 by the friction forces F ^ ₂ , - F ₁ - and in the downward movement of the plunger F ™ · + F _n - are generated. The downward movement of the plunger 1 beyond the sliding region takes place with a greater amount of the frictional force F ™ than in the upward movement thanks to the spring preload which has already been increased within the sliding region via the groove outlet 12 by sliding bodies IO.

In Figure 3, the effect is shown, from which it can be seen that in the downward movement of the plunger 1, the damping intensity is considerably greater than in the upward sbewegüng, which is particularly advantageous for mass-light devices in terms of stability. In Figure 4, the effect in the stationary area with the low friction forces F ^ and F ^ - is shown.

In FIG. 5, the oscillation angle is shown in the run-up phase by the solid line. In comparison, the dashed curve shows the vibration curve on friction dampers dependent on the direction of sun,

Claims (2)

Invention claims. 1 »Friction dampers for vibration damped machines and apparatus, in particular drum washing machines, comprising a cylindrical housing provided with a friction bushing and a ram provided with a friction piston, wherein the frictional forces generated on both the plunger and on the wall of the housing are caused by elastic elements and the arranged on the plunger friction piston is designed as an axially movable hollow cylinder, according to Patent 14-2 911, characterized in that the plunger (1) has a plurality of obliquely expiring at their ends grooves (13) and. on the friction piston (4) a plurality in the grooves (13) engaging sliding body (10) are arranged, the inclination of the end faces of the inclination of the Nutenausläufe (12) and the pins of the sliding body (10) are arranged nach.parallelen Nutengrund contactless 2 · Friction damper for vibration damped machinery and equipment, in particular drum washing machines, according to item 1, characterized in that the grooves (13) have different lengths, so that the Nutenauslaufe (12) against each other in the direction of movement of the plunger (1) are offset. For this 4 · page drawings.