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Coupling, Hydraulic tool-holder, Tool-holder, Bushing, Bush
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| Mechanical vs hydraulic clamping PSV 2001 is one of the most common mechanical types. This is a comparison between that and ETP most common types, ETP-CLASSIC and ETP-EXPRESS: | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ETP-CLASSIC | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ETP-EXPRESS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| J1Q0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 75 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5M5 | 68 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1 Vrs 21 Nm V-< | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5Nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 53 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 48 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 0 40 mm. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 940 Nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 940 Nm | 1 100 Nm | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| The company ETP Transmission AB have developed and manufactured hydraulic hub-shaft connections for more then 30 years, which are sold under the trademark ETP®. The company has built up a unique world-wide knowledge within the hydraulic fastening and centering field. Continuous development with customers has resulted in a steady flow of new products. The company has built up a leading position within three different business areas: general machine building (described in this brochure), industrial woodworking and metal machining. Since 1995 the company has been certified according to ISO 9001-2000. Authorized representatives with stock and high levels of technical service are present in each country in Western Europe, North America, Japan, Australia, New Zealand, South-Africa, India and Southeast Asia. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| PSV 2001 has more and bigger screws with high tightening torque. The most part of the tightening torque is used to overcome the internal friction between the conical sleeves and does not create any transmittable torque. The tightening torque for the ETP-Products is automatically transformed into an increase in internal pressure and surface pressure against hub and shaft surface for transmitting of torque. The design with mechanical sleeves causes uneven surface pressure to shaft/hub with high stress concentrations. ETP-Products are self-centering because of the hydraulic pressure which is uniform along/around the contact surfaces. This gives good centering, low unbalance and less vibration. The high surface pressure which is necessary, in combination with the short contact length, in order to transmit the torque, means that the hub has to be big to withstand the pressure for mechanical types. For ETP-Products a thin hub can be used because of the even and moderate surface pressure. The tightening of the screws for mechanical types often damages the screws and also the sleeves. This means that it is not suitable for repeated mounting/dismantling. ETP-CLASSIC/ETP-EXPRESS can be repeatedly mounted/dismantled with the same good result every time. The differences are even more obvious when comparing the designs in stainless versions: | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SS-EN ISO 9001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| PSV 2001-R | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ETP-CLASSIC R | ETP-EXPRESS R | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Box 1120, SE-581 11 Linköping Sweden Phone: +46 (0)13 24 71 00 Fax: +46 (0)13 24 71 90 E-mail: info@etp.se Internet: www.etp.se | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 410 Nm | 750 Nm | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1 100 Nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| The high friction coefficient for stainless to stainless surfaces, means even higher internal friction losses for a mechanical type. Also a lower tightening torque for stainless screws leads to a more than 50% decrease in torque transmission capacity. ETP-CLASSIC R compensates lower tightening torque for the screws with the addition of 1-3 screws in the flange. Due to space reasons mechanical types do not have the same possibilities. ETP-EXPRESS R with its internal pressure system, one screw which activates a piston, the same pressure is built up in the sleeve, thus the same level of transmittable torque is achieved. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ETP Transmission AB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Represented by: | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Conclusion: Why tighten up to 15 screws when fewer, or even just one screw, gives higher torque transmission! | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||