Bosch Air tools for industry catalog Page 107
Commercial customer offer**Top sellers from Bosch Blau
Air technology guide | 107 The driving force – The air motor The individual tools are designed differently depend- ▶ Small dimensions and a low weight allow for ing on the intended range of applications; the drive fatigue-free working and a versatile range of ap- motor and its structure are, however, in principle always the same – apart from the different sizes. plications. ▶ The robust, uncomplicated design guarantees long Due to its high power at small dimensions, the slidevalve motor or rotary vane motor is best suited to runtime and low susceptance to failure. ▶ Another advantage is the lack of susceptance to handheld air tools. It is driven by means of the expansion of compressed air, enabling it to perform me- external influences such as dust, moisture, etc. ▶ Air tools offer a high level of operational safety chanical work. because the drive medium (air) is safe and – due to the lack of spark formation – cannot trigger Essentially, the rotary vane motor consists of the an explosion (observe the special regulations for stator, the rotor that holds the rotary vanes in longi- working in explosion-hazardous areas). tudinal slots, and the sealing plates that close off the stator on both ends, and the rotor bearing. Since the expanding compressed air cools the tool, The eccentric arrangement of the rotor in relation the machine does not overheat. to the stator creates a sickle-shaped work chamber that is divided into individual chambers by the rotary ▶ Using the tools in wet and damp areas is not a vanes. These chambers are sealed against one an- problem. other, as their own centrifugal force means that the ▶ Easy maintenance and repair. rotary vanes press against the inner wall of the stator ▶ The air pressure should not fall below 6.3 bar at when they are running. The compressed air flowing the tool entrance (flow pressure) in order to ensure through the inlet channel presses on the vanes and full power output at the working spindle. makes the rotor turn. The air inlet and outlet are arranged depending on the desired direction of rotation. As a rule, in order to achieve the right working speed in each case, there are planetary gears in front of the motor. The following typical features make the air motor the ideal drive element for all different kinds of applicaCharacteristic curves of an air motor tion ranges: behaviour for different applications. With increasing load and decreasing speed, the torque rises to a maximum at standstill (Fig. 1) – this is utilised, Starting torque Power P ▶ The air motor has constantly favourable torque Mmax Stall torque Torque M Pmax for example, in screwdrivers. ▶ It is possible to operate the motor until standstill, P which rules out the possibility of failure due to M overload. ▶ The standstill torque is infinitely adjustable by changing the pressure of the compressed air being supplied (pressure controller). The speed is infi- = n0 2 Speed n n0 nitely adjustable by changing the flow rate (throttle valve). Fig. 1 Characteristic curves of an air motor
116 Pages | Valid until 06/2024 | Previous page | Next page
Choose your language
Legal issues
The manufacturer is exclusively responsible for the content, price and article details of the products and offers presented in the catalogues. Subject to technical and optical changes by the manufacturer and errors excepted.
Request form for special products
The ToolTeam® Procurement Service
Are you looking for products that are shown in the catalogue but cannot be purchased directly online?Our procurement service will be pleased to make you a non-binding and individual offer.