Motor vehicles – Special driving device – Portable track
Patent
1996-01-02
1998-08-18
Johnson, Brian L.
Motor vehicles
Special driving device
Portable track
305146, B62D 5530
Patent
active
057947317
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/DE94/00524 filed 4 May 1994 and based in turn, on German national application P4323912.9 filed 16 Jul. 1993 and P4330833.3 filed 11 Sep. 1993 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a tensioning and shock-absorption device for the idler wheel of a tracked vehicle.
BACKGROUND OF THE INVENTION
Such a device is known from EP 0 052 310 A1. In the known device it is required to create a countersupport for the hydraulic tensioning unit by means of a transverse frame which is rigidly connected with the vehicle chassis. This translates into a considerable construction expense, whereby in addition the overall dimensions of the entire assembly are enlarged.
From the DE-GM 90 11 884 a tensioning device for the idler wheel of a tracked vehicle is known, consisting of a hydraulic correcting element and a spring-tensioning device with pretensioned helical springs, whereby the tensioning device is fitted between mounting elements of the idler wheel and the mounting elements on the chassis side.
Thereby the hydraulic correcting element is a hydraulic cylinder, on whose piston a plunger is arranged, which projects towards the mounting elements of the idler wheel and can rest against them. At the cylinder end facing away from the idler wheel a feeding device for filling or emptying the cylinder chamber containing the hydraulic medium is provided. On the hydraulic cylinder end facing the idler wheel a stop plate is fastened to the outer cylinder wall, while at the hydraulic cylinder end facing away from the idler wheel a further stop plate is supported slidably towards a final stop plate. The helical spring is tensioned between the stop plates. In the desired mounting position the slidable stop plate rests with its side facing away from the helical spring against the mounting elements on the chassis side, whereby these mounting elements form a free space for the spring deflection of the hydraulic cylinder. Thereby the helical spring is arranged coaxially with the hydraulic cylinder which passes through it with slight play. The corresponding chamber of the hydraulic cylinder is filled with grease.
The slidable stop plate is thereby formed by a screw nut, which is screwed onto the hydraulic cylinder end provided with an outer thread, whereby the threading zone of the hydraulic cylinder corresponds to a multiple of the screw nut height. As a result the pretensioning of the helical spring can be changed. The stop plates also have radially projecting guide plates, which engage in guide ridges on the chassis side, so that they can slide in the longitudinal direction of the tensioning device and can not be radially rotated.
With such a device small overall dimensions are achieved, whereby it is also possible to make any repairs which might be needed in a defect tensioning device right on site, by emptying the hydraulic medium from the corresponding chamber of the hydraulic cylinder, so that afterwards the tensioning device can be dismounted from the machine chassis. By arranging the tensioning device in a corresponding auxiliary device, for instance a U-shaped mounting, the tensioning device can be relieved of load, so that the individual parts can be adjusted or also dismounted.
Although such a device has proven itself during operation,. there is a drawback in the fact that such a device can be fitted or stored and delivered only with pretensioned helical springs, since the pretensioning of the helical springs has to be done in a special installation. This can lead to accidents caused by the considerably pretensioned helical springs, when they distend suddenly due to improper handling of device. Such a helical spring is pretensioned for instance with 160 to 190 kN.
OBJECT OF THE INVENTION
It is the object of the present invention to provide a device wherein the storage, transport and the fitting of the device can take place with an undertensioned spring unit that can be pretensioned
REFERENCES:
patent: 3841715 (1974-10-01), Comer, Jr. et al.
patent: 3980351 (1976-09-01), Orr et al.
patent: 4413862 (1983-11-01), Ragon
patent: 4580850 (1986-04-01), Bissi et al.
Dubno Herbert
Intertractor AG
Johnson Brian L.
Kateshov Yuri
Lerner Avraham
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