CZ2014349A3 - Pneumatic implement drive - Google Patents

Abstract

The drive of the pneumatic tool is formed by an air turbine motor (1) connected to the gearbox (3) and comprises a plurality of gears, the first gear stage being located outside the gearbox (3). The first gear reduces the speed brought from the air turbine engine (1) and thus also the speed of the other gears located inside the gearbox (3). The first gear stage of a belt or chain drive, e.g. a drive pulley (7), a belt (2) and a driven pulley (8), where the drive pulley (7) is connected by an output shaft (6) to an air turbine engine (preferably 1) and the input shaft (4) of the gearbox (3) is connected to the other gear stages within the gearbox (3).

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to a pneumatic tool drive, the drive comprising an air turbine engine coupled to a gearbox and comprising a plurality of gears.

BACKGROUND OF THE INVENTION

Pneumatic tools such as drills, grinders, riveters, ratchets, wrenches, chisels, trimmers, air winches, etc. are equipped with an air turbine engine, mostly an air turbine. The speed control of the pneumatic tool is either controlled directly by the speed control of the air turbine or the air motor shaft is connected to the gearbox, where several gears are located.

The disadvantage of these embodiments is, however, that the oil from the gearbox usually leaks out of the casing and the operation of the pneumatic tool is thus considerably more difficult.

It is therefore an object of the invention to provide a pneumatic tool drive that removes oil leakage from the transmission housing.

SUMMARY OF THE INVENTION

The object is achieved by driving a pneumatic tool according to the invention, the principle being that at least the first gear from the air turbine engine is located outside the gearbox. Thus, the gears of the other gears located inside the gearbox are lower and oil is not sprayed onto the gearbox walls and, in particular, into the gaskets between the parts to be joined. This prevents oil leakage through the seals outside the gearbox.

In a preferred embodiment, the gear stage located outside the gearbox is formed by a belt or chain transmission, but no other embodiment of the transmission is excluded.

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BRIEF DESCRIPTION OF THE DRAWINGS

The drive of the pneumatic tool according to the invention is shown schematically in the accompanying drawing in FIG.

DETAILED DESCRIPTION OF THE INVENTION

The pneumatic tool drive comprises an air turbine engine 1, in this case a high-speed air turbine, on whose output shaft 6 a drive pulley 7 is connected, connected by a belt 2 to a driven pulley 8 located on the input shaft 4 of the gearbox 3. The belt transmission formed by the drive pulley 7, the belt 2 and the driven pulley 8 forms a first gear located outside the gearbox 3. This first gear reduces the speed supplied from the air turbine engine 1 as well as the speed of the other gears located inside the gearbox 3. This gearbox 3 is filled with gear oil and due to the lower speed inside the gear wheels located there is no sharp spraying of the gear oil onto the walls of the gearbox 3 and into the sealing plane thereof. This prevents the transmission oil from escaping from the transmission housing 3.

Claims (2)

PATENT CLAIMS Pneumatic tool drive, wherein the drive comprises an air turbine engine (1) connected to a gearbox (3), characterized in that at least the first gear is located outside the gearbox (3). Pneumatic tool drive according to claim 1, characterized in that the first gear stage located outside the gear housing (3) is a belt or chain transmission.