CS240056B1 - Wheel excavator wheel drive - Google Patents

Abstract

The wheel drive is moved to a fixed part of the machine, preferably as a counterweight. The drive group is an electric motor, the gearbox drives the wheel via guide pulleys using a rope or belt. A tension pulley is included in the transmission, which releases the pretension when the set permissible rope tension is exceeded, thus allowing slippage. This prevents direct transmission of shocks from the wheel to the gearbox. By placing the drive group outside the tip of the bucket excavator boom, great savings in machine weight are achieved because, according to previous experience, a saving of 1 kg of weight at the tip of the boom brings about 7 kg of the weight of the entire machine.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel excavator wheel drive wheel consisting of an engine, gearbox, traction sheave and fixed guide pulley system.

The current solution uses high-speed electric motors in which the speed and torque are reduced by means of gearboxes. The entire drive complex is located in the immediate vicinity of the wheel. The disadvantage of this solution is that the weight of the engines and transmissions loads the boom tip and increases the total weight of the machine. A further disadvantage of this arrangement is the direct transmission of impacts from the wheel to the gearboxes, thereby increasing the failure rate of the wheel excavator. This results in considerable repair losses and reduced machine utilization.

The above-mentioned disadvantages are essentially eliminated by the invention of the wheel drive of a wheeled excavator, which is based on the fact that the engine, gearbox, driving sheave and / or drive sheave, respectively. pulleys with a fixed guide pulley system are located on the wheeled excavator outside the extendable boom section. The tension roller is included in the fixed guide pulley system. Near the rope sheave, respectively. an adjustable idler pulley is located on the wheel pulley, whereby the torque transmission is effected by a rope or belt.

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The main advantage of the solution is material savings. Experience to date with the construction of wheeled excavators saves about 1 kg of weight at the tip of the boom and saves about 7 kg of weight on the entire machine. The motors and gearboxes may be located on the machine superstructure or preferably as a counterweight. Possible torque shocks are not transmitted directly from the wheel to the gearbox, but are dampened by the elasticity of the rope, possibly by a controlled slip. This will reduce transmission failure losses and increase machine utilization.

The attached drawing shows an exemplary embodiment in a schematic diagram.

The drive group consisting of the motor M, the gearbox P with the pulley drive pulleyPL are located on the non-retractable boom section. The cable L is guided through a set of fixed pulleys VI to Vn. On the withdrawable part there is a pulley K of the wheel together with an adjustable guide pulley VK and a balancing pulley VY. In the system of fixed idler pulleys VI to Vn, a tensioner pulley N is provided which, if the set permissible tension F of the rope L in the upper strand is exceeded, allows the lanaf to be preloaded, thereby allowing slipping and immediate interruption of force transmission. The direct shock transmission from the wheel to the gearbox P is thereby eliminated.

The alignment pulley VY moves at the same time as the extension part of the boom and thus eliminates the change in the length of the rope when the boom extends. On machines with a non-retractable boom, the use of the VY compensator roller is no longer required.

The inventive drive solution also allows a multi-motor drive with multiple pulley sheaves or pulleys in the case of belts. The traction sheave K can be mounted either on one side of the wheel or, in the case of a multi-engine drive, with either a symmetrical or asymmetrical distribution of the sheave K on both sides of the wheel. It is also possible to drive several cables in one drive group.

Claims (2)

SUBJECT OF THE INVENTION 240 OSS Wheel drive of a wheeled excavator consisting of a motor, gearbox, drive train and a fixed guide pulley system, characterized in that the motor (M), gearbox (P), drive pulley (PL) and / or the drive train (M). pulleys with a fixed guide pulley system (VI to Vn) are mounted on the wheel excavator outside the extendable boom section, a tension pulley (N) is placed in the fixed guide pulley system (VI to Vn) and near the sheave (K) resp. an adjustable idler (VK) is positioned on the wheel pulley, whereby the torque transmission is effected by a rope (L) or a belt. Drive according to claim 1, characterized in that a compensating roller (VY) is arranged on the opposite side of the wheel excavator boom downstream of the drive group (Μ, P, PL), the excavator boom being extensible.