Hollow cylinders

version with internal thread
single and double acting
max. operating pressure 500 bar

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Description

B 1.7441 Hollow-piston cylinders

Hollow-piston cylinders are especially suitable for clamping workpieces that have a through hole or opening.

The piston has a through hole with an internal thread.
In connection with a standard tie rod and C-washer combination a variety of applications is possible (see application examples).
After the workpiece has been inserted and centred by hand, the C-washer can be pushed onto the tie rod and then clamped hydraulically.
Compared to mechanical clamping with clamping screws this has significant advantages:

The clamping force can be hydraulically adjusted with precision and high repetitive accuracy
The operator can fully concentrate on the correct position of the workpiece
A significant time saving

Products (12)

Number

Item no.	CAD data	stroke [mm]	functioning	piston diameter [mm]	max. force to push [kN]
Item no. 1758004	CAD data	stroke [mm] 20	functioning single acting with spring return	piston diameter [mm] 80	max. force to push [kN] -	Properties
Item no. 1758023	CAD data	stroke [mm] 40	functioning double acting	piston diameter [mm] 80	max. force to push [kN] 153	Properties

Accessories (12)

Number

Item no.	CAD data	Description
Item no. 3300054	CAD data /	Description
Item no. 3300134	CAD data	Description Lock nut DIN 1804 M120 x 2 mm as per data sheet B1.7441
Item no. 3300277	CAD data /	Description
Item no. 3300324	CAD data	Description Flange nut DIN 1804 M48 x 1,5 mm see page B1.309
Item no. 3300411	CAD data	Description Flange nut M60 x 1,5 mm W black oxided see page B1.460
Item no. 3300412	CAD data	Description Flange nut DIN 1804 M90 x 2 mm see page B1.309
Item no. 3300673	CAD data	Description Flange nut DIN 1804 M75 x 1,5 mm see page B1.309
Item no. 3300699	CAD data	Description Flange nut DIN 1804 M40 x 1,5 mm see page B1.309
Item no. 3301263	CAD data	Description Socket head cap screw M8 x 20 mm, 8.8, galvanized as per data sheet B1.7441
Item no. 3456310	CAD data	Description Flange for hollow-piston cylinder 1756-XXX Ø 105 x 20 mm as per data sheet B1.7441

Application examples

Application example 1

Hollow-piston cylinders in combination with push-pull bolt and “C”-washer can be used advantageously in many cases to clamp workpieces with centre openings.

Application example 2

On the shown machine table, the workpiece is clamped with a hollow-piston cylinder and additionally supported with a work support, controlled by a sequence valve.
The support plunger of the work support is retracted in off-position to facilitate workpiece loading. Contact is effected by means of spring force. The savings in workpiece exchange time, compared to a mechanical clamping system amounts to 58%.

Application example 3

This clamping fixture is for milling operation on a light extruded rail. Workholding by means of hollow-piston cylinders in individual clamping stations mounted on a base plate. Positioning and support of the rail is effected with two longitudinal members matching the cross section of the rail.