Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Guide roll mounted for movement of its axis along arcuate...
Patent
1989-05-30
1990-12-11
Bui, Thuy M.
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Guide roll mounted for movement of its axis along arcuate...
474110, 474138, F16H 712
Patent
active
049766600
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This U.S. application stems from PCT International Application No. PCT/EP88/00696 filed Aug. 1, 1988.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This innovation is concerned with an apparatus for tensioning V-belts, especially for automotive vehicles, comprising a link member of variable length which engages a movable support of a pulley and is supported by a stationary abutment, said link member comprising a casing carrying a connection bearing, a piston rod guided within the casing and carrying a further connection bearing, and a helical compression spring anchored between a spring rest of the casing and a spring rest of the piston rod.
2. Description of Related Art
Known apparatus of the specified kind effect a length adjustment of the V-belt loop which is insufficient to prevent fluttering of the belt at high rotational speeds when there occur differences in length of the V-belt due to aging or due to the action of heat or hooking up of auxiliary means driven by the V-belt.
SUMMARY OF THE INVENTION
In respect thereto this innovation is intended to design an apparatus for tensioning V-belts in such a way that an automatic compensation of variations of the effective length of the V-belt loop becomes possible while fluttering will not occur at high rotational speeds.
With an apparatus of the kind briefly described above, the specified object is achieved in accordance with this innovation in that, with reference to the operative position, there extends from the bottom of the casing a cylinder which includes and guides a piston portion of the piston rod with a clearance that permits a leakage flow of pressurized liquid, the pressurized liquid-filled cylinder space of said cylinder being communicated on the one hand with a casing interior between the piston rod or the cylinder comprising the same, respectively, and being communicated on the other hand with the casing surface via a system of passageways which includes a spring-biased check valve for blocking the pressurized liquid flow form the cylinder space.
Thus, the pressurized liquid filled into the cylinder space constitutes a support for the piston rod relative to the casing, while irrespective of the action of the check valve and the incompressibility of the liquid content said support is not rigid but is of variable volume due to the possible leakage flow of pressurized liquid via the specified clearance, wherein it is possible rapidly to make up the pressurized liquid content of the mentioned cylinder due to the action of the check valve in the sense of increasing the effective length of the link member and to reduce it more slowly in the sense of shortening the link member due to the leakage flow of pressurized liquid on account of the specified clearance. Moreover, a flow of pressurized liquid via the check valve allows damping of the length-varying movement of the link member for effectively damping any belt vibrations or flutter.
Advantageous configurations of the apparatus in accordance with the innovation are characterized in the claims 2 to 5, the content of which is expressly made part of the specification without a repetition of the wording thereof.
BRIEF DESCRIPTION OF THE DRAWING
Below, a preferred embodiment will be explained with reference to the drawing, in which: apparatus for tensioning V-belts, and
FIG. 2 is a partially sectional side view of a link member of the apparatus illustrated in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 illustrates a portion of a V-belt 1 which is trained over a pulley 2 of a drive mechanism or of a driven part and over an idling pulley 3. The pulley 3 is fixed to the casing at 5 via a link 4 and is adapted to be biased towards the V-belt 1 by means of a variable-length link member 6 so as to maintain the V-belt under tension. The link member 6 comprises a piston rod 8 connected via a connection bearing 7 to the link member 4 and a casing 10 connected via a connection bearing 9 to a portion of a frame structure.
The piston rod 8
REFERENCES:
patent: 4539001 (1985-09-01), Okabe
patent: 4657524 (1987-04-01), Okabe
patent: 4790801 (1988-12-01), Schmidt et al.
Bui Thuy M.
INA Walzlager Schaeffler KG
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